CN112366754B - Multi-winding motor self-power-generation micro-grid system for oil pumping unit - Google Patents
Multi-winding motor self-power-generation micro-grid system for oil pumping unit Download PDFInfo
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- 238000004804 winding Methods 0.000 title claims abstract description 193
- 238000010248 power generation Methods 0.000 title claims abstract description 112
- 238000005086 pumping Methods 0.000 title claims abstract description 86
- 238000004146 energy storage Methods 0.000 claims abstract description 81
- 238000004364 calculation method Methods 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 7
- 230000033228 biological regulation Effects 0.000 claims description 5
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- 230000005540 biological transmission Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 5
- 239000003129 oil well Substances 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000005284 excitation Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- 238000005381 potential energy Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 238000013459 approach Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/02—Details of stopping control
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Abstract
The invention discloses a multi-winding motor self-generating micro-grid system for an oil pumping unit, which comprises the oil pumping unit, a multi-winding motor, a controllable rectifying module, an energy storage battery, a DC/AC inverter, a micro-grid intelligent control module and a power frequency grid, wherein the multi-winding motor is connected with the energy storage battery; the pumping unit is connected with a rotor of the multi-winding motor, a stator of the multi-winding motor comprises an electric operation winding and a feedback power generation winding, the electric operation winding is connected with a power frequency power grid, the feedback power generation winding is connected with a controllable rectification module, the controllable rectification module is connected with an energy storage battery, and the energy storage battery is connected with a DC/AC inverter; the multi-winding motor, the controllable rectifying module and the energy storage battery are all connected with the micro-grid intelligent control module. The advantages are that: compared with the traditional motor, the power generation efficiency is greatly improved, and the utilization rate of the reverse power generation electric energy is improved; the power generation and power utilization network is electrically decoupled from the power frequency alternating current power grid, so that the flexibility of the power grid is improved, and meanwhile, when the power supply network fails, the protection effect on auxiliary electric equipment of a well site can be achieved.
Description
Technical Field
The invention relates to the field of micro-grids, in particular to a multi-winding motor self-generating micro-grid system for an oil pumping unit.
Background
The oil pumping unit is an important device in the oil exploitation process, and according to statistics of relevant authoritative departments, more than 100 ten thousand oil wells exist in China. These pumping units operate continuously for 24 hours almost all the year round and continuously collect oil. The load characteristic of the oil pumping unit has the characteristic of periodic reciprocation. In recent years, in order to save energy and improve efficiency and reduce oil extraction cost, different types of pumping unit systems are designed, researched and developed in sequence and popularized in the oil field industry. These novel pumping units mainly have three routes on energy-saving thinking of ways:
route one: the mechanical structure of the pumping unit is improved, so that the load is more uniform and continuous. For example, the load of the driving motor is adjusted by adjusting the positions of the balance weight and the sliding block in the vertical reciprocating motion process of the four-bar pumping unit, so that the load of the driving motor is more stable, the motor can work in a rated working condition for more time, and the running is more efficient. Of course, other novel pumping unit structures, such as a traction type pumping unit and the like, adopt a mode similar to a vertical elevator counterweight and realize energy conservation of the pumping unit by switching the forward rotation and the reverse rotation of a motor.
And a second route: the driving motor with higher efficiency is adopted, and the routes of the motor and the control method of the pumping unit are optimized. The main idea of this approach is to focus on the electrical matching optimization of the motor itself and the motor and pumping unit system. For example, permanent magnet motors, switched reluctance motors, variable frequency speed control and other technologies used in recent years.
And a third route: the gravitational potential energy of the pumping rod in the lowering process is collected by utilizing the working condition characteristic of backward power generation of the pumping unit, and is converted into kinetic energy through the transmission mechanism, so that the kinetic energy is collected as electric energy. The collected electric energy can be fed back to the power grid and can also be utilized by the user.
The technical route of energy saving by utilizing reverse power generation of the oil pumping unit is a patent technology and a product which are already disclosed at present, and mainly has the following problems.
Problem 1: the power generation efficiency is low; the pumping unit sucker rod and its transmission system need utilize the generator in gravitational potential energy and kinetic energy of transfer in-process, turn into the electrical energy with mechanical energy, the main driving motor of pumping unit is in order to satisfy starting capability and overload capacity under extreme well condition, usually the selected power is great, but the generating energy in the actual operation in-process is less, the operating efficiency of motor itself under the light load operating mode is very low, these several factors superpose, will make the electric energy of actually sending out very limited, according to the relevant statistical data in oil field, according to the current common way of utilizing of generating electricity of falling, the energy that typical pumping unit motor falls to generate electricity and provides is not enough to consume the energy under the electric state 3%. The low-efficiency energy utilization rate is low, and the complex electric energy feedback equipment is added, so that the cost performance of the backward power generation energy utilization of the oil pumping unit is low, and the backward power generation technical product of the oil pumping unit still stays in the research and experiment stages at present and is not popularized in a large area.
Problem 2: the problem of how to utilize the generated energy; the pumping unit reversely generates electric energy, and common utilization modes comprise electric network feedback, brake consumption and well site self-use.
The utilization mode of the feedback power grid is that for a non-speed-regulation power frequency asynchronous motor system, a motor is directly connected with a power frequency alternating current power grid, the generated energy is uncontrollable, the power grid does not charge the electric energy generated in the reverse direction, and the electric energy value of the feedback power grid is not approved by the power grid because the generated electric energy quality of the asynchronous motor is low. For a variable frequency speed control system, a frequency converter working in four quadrants is adopted, although the generated energy of a motor can be reversely fed back to a power grid, the power quality is low due to large harmonic waves, and the fed back power to the power grid is still not approved.
The mode of braking consumption is mainly for a motor needing frequency conversion and speed regulation, because a conventional frequency converter adopts a working mode of rectifying before inverting, electric energy at the rectifying side of the front section cannot feed back to a power grid, and at the moment, an energy consumption braking mode is usually adopted to consume the reverse generating energy of the motor in a braking resistor through a braking chopper. In this way, the reverse generation energy is consumed in the brake resistor.
The wellsite is self-service, and the wellsite usually has some auxiliary equipment, such as a geothermal pump, a lighting system, a metering system, and the like. Some attended well sites also need auxiliary domestic electric equipment such as air conditioners, electric heaters, induction cookers and the like. Because well site energy storage adopts the direct current mode mostly, but the actual consumer is different, needs three-phase alternating current power supply some, needs single-phase alternating current power supply some, still some need direct current power supply. The power consumption requirements of different devices also put forward higher requirements on the inverted power generation system, and how to meet the flexible power consumption of the devices is also a problem.
Because of the problems, the existing pumping unit industry in China still stays at a relatively primary stage in the aspect of reverse power generation utilization, the power generation energy is basically consumed and wasted through a brake resistor for a variable-frequency speed-regulating pumping unit system, and the reverse power generation energy is basically in an uncontrollable and unmeasurable state for a power grid power frequency driving system.
Disclosure of Invention
The invention aims to provide a multi-winding motor self-generating micro-grid system for an oil pumping unit, so that the problems in the prior art are solved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a multi-winding motor self-generating micro-grid system for an oil pumping unit comprises the oil pumping unit, a multi-winding motor, a controllable rectification module, an energy storage battery, a DC/AC inverter, a micro-grid intelligent control module and a power frequency grid; the pumping unit is connected with a rotor of the multi-winding motor, a stator of the multi-winding motor comprises an electric operation winding and a feedback power generation winding, the electric operation winding is connected with the power frequency power grid, the feedback power generation winding is connected with the controllable rectification module, the controllable rectification module is connected with the energy storage battery, and the energy storage battery is connected with the DC/AC inverter; the multi-winding motor, the controllable rectifying module and the energy storage battery are all connected with the micro-grid intelligent control module.
Preferably, the self-generating microgrid system is connected with electric equipment at a well site, the electric equipment at the well site comprises direct current electric equipment and alternating current electric equipment, the direct current electric equipment is connected with the energy storage battery, and the alternating current electric equipment is connected with the DC/AC inverter.
Preferably, when the multi-winding motor is a multi-winding asynchronous motor, a first electric quantity collector is arranged on the electric operation winding, and the first electric quantity collector is connected with the micro-grid intelligent control module; the feedback power generation winding is connected with the controllable rectification module, a second electric quantity collector is arranged on the feedback power generation winding, and the second electric quantity collector is connected with the micro-grid intelligent control module.
Preferably, the microgrid intelligent control module comprises a first electric quantity acquisition unit, a power calculation unit, a second electric quantity acquisition unit, a rectification trigger unit and a battery management unit; the first electric quantity collector is connected with the first electric quantity collection unit, the second electric quantity collector is connected with the second electric quantity collection unit, the controllable rectification module is connected with the rectification trigger unit, and the energy storage battery is connected with the battery management unit.
Preferably, the power calculating unit calculates the active power of the electric operating winding according to the voltage and the current of the electric operating winding acquired by the first electric quantity acquiring unit, when the active power has a negative value, the pumping unit is indicated to enter a feedback braking state, and the rectification triggering unit controls the controllable rectification module to start so as to realize controllable rectification.
Preferably, when the motor continuously works for a plurality of power generation cycles to enable the electric energy stored in the energy storage battery to reach the upper limit of the capacity, if the battery management unit detects that the real-time direct current voltage of the energy storage battery is higher than the preset maximum safe voltage, the rectification trigger unit controls the controllable rectification module to be closed, and the connection between the feedback power generation winding and the well site electric equipment is disconnected; when the motor continuously works for a plurality of power generation cycles, the energy storage battery is not connected with well site electric equipment all the time and keeps a full power state, the controllable rectification module is always kept in a closed state, and the oil pumping unit generates power through the electric operation winding; when the well site power utilization equipment is connected, the energy storage battery discharges, the rectification trigger module controls the controllable rectification module to start, the feedback power generation winding charges the energy storage battery, and the rectification trigger module controls the controllable rectification module to close until the energy storage battery is fully charged.
Preferably, when the multi-winding motor is a multi-winding permanent magnet motor, a first electric quantity collector and a power electronic device for controlling the start, stop and speed regulation of the electric operation winding are arranged on the electric operation winding, and the first electric quantity collector and the power electronic device are both connected with the micro-grid intelligent control module; the feedback power generation winding is connected with the controllable rectification module, a second electric quantity collector is arranged on the feedback power generation winding, and the second electric quantity collector is connected with the micro-grid intelligent control module.
Preferably, the microgrid intelligent control module comprises a driving control unit, a first electric quantity acquisition unit, a power calculation unit, a second electric quantity acquisition unit, a rectification trigger unit and a battery management unit; the power electronic device is connected with the drive control unit, the first electric quantity collector is connected with the first electric quantity collection unit, the second electric quantity collector is connected with the second electric quantity collection unit, the controllable rectification module is connected with the rectification trigger unit, and the energy storage battery is connected with the battery management unit.
Preferably, the power calculation unit calculates the active power of the electric operation winding according to the voltage and the current of the electric operation winding acquired by the first electric quantity acquisition unit, when the active power has a negative value, the pumping unit is indicated to enter a feedback braking state, and the driving control unit controls the power electronic device to be disconnected, so that the connection between the electric operation winding and the power frequency power grid is disconnected; meanwhile, the rectification trigger unit controls the controllable rectification module to start, so that controllable rectification is realized.
Preferably, when the motor continuously works for a plurality of power generation cycles to enable the electric energy stored in the energy storage battery to reach the upper limit of the capacity, if the battery management unit detects that the real-time direct current voltage of the energy storage battery is higher than the preset maximum safe voltage, the rectification trigger unit controls the controllable rectification module to be closed, and the connection between the feedback power generation winding and the well site electric equipment is disconnected; meanwhile, the drive control unit controls the power electronic device to be closed, and the connection between the electric operation winding and the power frequency power grid is conducted; when the motor continuously works for a plurality of power generation periods, the energy storage battery is not connected with well site electric equipment all the time and keeps a full power state, the controllable rectification module is always kept in a closed state, the driving control unit controls the power electronic device to be closed, the electric operation winding is connected to a power frequency power grid, and the oil pumping unit generates power through the electric operation winding; when the well site power utilization equipment is connected, the energy storage battery discharges, the rectification trigger module controls the controllable rectification module to start, the feedback power generation winding charges the energy storage battery until the energy storage battery is fully charged, the rectification trigger module controls the controllable rectification module to close, the driving control unit controls the power electronic device to close, and the electric operation winding is connected to the power frequency power grid.
The invention has the beneficial effects that: 1. compared with the traditional motor, the power generation efficiency is greatly improved, and the utilization rate of the reverse power generation electric energy is improved; 2. the power generation and power utilization network is electrically decoupled from the power frequency alternating current power grid, so that the flexibility of the power grid is improved, and meanwhile, when the power supply network fails, the auxiliary electric equipment of the well site can be protected; 3. equipment investment such as a frequency converter is not required to be added, so that the cost is saved; 4. the intelligent micro-grid system can provide different power supplies such as direct current, single-phase alternating current and three-phase alternating current, and has better adaptability to electric equipment. 5. When the pumping unit is maintained, the motor is powered off and stops, and the transmission mechanism of the pumping unit can stop more quickly due to the energy feedback and the electric damping effect of the power generation winding.
Drawings
Fig. 1 is a schematic structural diagram of a self-generating microgrid system in a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a self-generating microgrid system in a second embodiment of the present invention;
FIG. 3 is a schematic diagram of a motor power curve of a pumping unit adopting a self-generating micro-grid system in the embodiment of the invention;
fig. 4 is a schematic diagram of a system architecture for reverse power generation energy utilization of a pumping unit in the prior art.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Example one
As shown in fig. 1, in the present embodiment, a multi-winding motor self-generating microgrid system for an oil pumping unit is provided, which includes an oil pumping unit, a multi-winding motor, a controllable rectifier module, an energy storage battery, a DC/AC inverter, a microgrid intelligent control module and a power frequency grid; the pumping unit is connected with a rotor of the multi-winding motor, a stator of the multi-winding motor comprises an electric operation winding and a feedback power generation winding, the electric operation winding is connected with the power frequency power grid, the feedback power generation winding is connected with the controllable rectification module, the controllable rectification module is connected with the energy storage battery, and the energy storage battery is connected with the DC/AC inverter; the multi-winding motor, the controllable rectifying module and the energy storage battery are all connected with the micro-grid intelligent control module.
In this embodiment, the self-generating microgrid system is connected to electrical equipment at a wellsite, the electrical equipment at the wellsite includes direct current electrical equipment and alternating current electrical equipment, the direct current electrical equipment is connected to the energy storage battery, and the alternating current electrical equipment is connected to the DC/AC inverter.
In this embodiment, the multi-winding motor is a multi-winding asynchronous motor, a first electric quantity collector is arranged on the electric operation winding, and the first electric quantity collector is connected with the micro-grid intelligent control module; the feedback power generation winding is connected with the controllable rectification module, a second electric quantity collector is arranged on the feedback power generation winding, and the second electric quantity collector is connected with the micro-grid intelligent control module.
In this embodiment, the microgrid intelligent control module comprises a first electric quantity acquisition unit, a power calculation unit, a second electric quantity acquisition unit, a rectification trigger unit and a battery management unit; the first electric quantity collector is connected with the first electric quantity collection unit, the second electric quantity collector is connected with the second electric quantity collection unit, the controllable rectification module is connected with the rectification trigger unit, and the energy storage battery is connected with the battery management unit.
In this embodiment, the power calculating unit calculates the active power of the electric operating winding according to the voltage and the current of the electric operating winding acquired by the first electric quantity acquiring unit, when the active power has a negative value, it indicates that the pumping unit enters a feedback braking state, and the rectification triggering unit controls the controllable rectification module to start, so as to implement controllable rectification.
In this embodiment, when the motor continuously operates for a plurality of power generation cycles to enable the electric energy stored in the energy storage battery to reach the upper limit of the capacity, if the battery management unit detects that the real-time direct current voltage of the energy storage battery is higher than the preset maximum safe voltage, the rectification trigger unit controls the controllable rectification module to be turned off, and the connection between the feedback power generation winding and the well site power utilization equipment is disconnected; when the motor continuously works for a plurality of power generation cycles, the energy storage battery is not connected with well site electric equipment all the time and keeps a full power state, the controllable rectification module is always kept in a closed state, and the oil pumping unit generates power through the electric operation winding; when the well site power utilization equipment is connected, the energy storage battery discharges, the rectification trigger module controls the controllable rectification module to start, the feedback power generation winding charges the energy storage battery, and the rectification trigger module controls the controllable rectification module to close until the energy storage battery is fully charged.
In this embodiment, the multi-winding motor is a multi-winding asynchronous motor. The multi-winding asynchronous motor is characterized in that the asynchronous motor for driving the pumping unit has a multi-winding structure, wherein some windings are used for the motor and need to run for a long time. There are also windings used for generating electricity. The self-generating micro-grid system means that the generated energy of the asynchronous motor does not need to be fed back to a power grid, but forms a local micro-grid automatically to supply power to auxiliary supporting equipment of an oil well.
The self-generating micro-grid system integrates the functions of a motor and a generator on one asynchronous motor. The system comprises the following components: the system comprises an oil pumping unit, an asynchronous motor with multiple windings, a controllable rectification module, an energy storage battery, a DC/AC inverter, a micro-grid intelligent control module and well site electric equipment (direct current equipment and alternating current equipment).
Because the asynchronous motor rotor does not have an independent magnetic field generated by an excitation winding or a permanent magnet, and excitation is provided by stator current, the asynchronous motor must be connected to a power frequency grid to finish power generation operation, and if power generation is performed only by a winding connected to the grid, the feedback process of electric energy generated by the motor winding is uncontrollable, the electric energy can be controllably fed back to the grid unless a frequency converter working in four quadrants is additionally arranged between the asynchronous motor and the grid, but the acquisition cost of the frequency converter is inevitably increased.
The asynchronous motor is adopted to simultaneously provide two winding structures of electric driving and power generation, and the asynchronous motor has the advantages that rotor excitation provided by long-term operation of the electric winding is utilized, and meanwhile, the rotor magnetic field rotates to cut the stator power generation winding to provide electric energy. Especially, when the pumping unit drives the transmission mechanism to convert mechanical energy and electric energy under the action of gravitational potential energy, the power generation winding can provide an electric power supply loop independent of a power frequency power grid, and the power generation winding charges the energy storage battery through the controllable rectification module. When the electric equipment of the well site needs direct current power supply, the electric equipment directly gets electricity from the energy storage battery; when the electric equipment of the well site needs alternating current power supply, the electric load is supplied with electric energy through the DC/AC inverter.
Because the motor is provided with the electric winding and the power generation winding which are mutually independent, the optimal design can be carried out according to respective requirements when the winding structure is designed, and the design contradiction that the traditional motor only has one set of winding and can not give consideration to the electric and power generation performances is avoided. After the technical route is adopted, the power generation efficiency of the motor is greatly improved, and the power generation amount is improved by 5-10 times compared with that of the traditional asynchronous motor under the same working condition. By taking a typical pumping unit well site as an example, the single-day power consumption of a single oil well is calculated to be 200kwh, and after the technical route is adopted, 40-50kwh of power can be generated in a single day, the requirement of auxiliary power utilization equipment of the well site can be basically met, so that extra electric energy does not need to be required from a power grid, and the comprehensive power consumption of the well site is indirectly reduced.
For the micro-grid intelligent power generation system, a power generation winding conduction time control and battery energy management system is the core. Since the pumping unit has a periodic load characteristic, the control method is described here by taking the second complete working cycle in fig. 3 as an example. In the whole working period, the electric winding is connected to a power frequency power grid, and the continuous operation of the pumping unit is ensured. And calculating active power P = U I cos phi of the electric winding according to electric quantity collection data (voltage, current and the like) of the electric winding collected in real time, wherein U is voltage, I is current, and cos phi is a cosine value of an included angle between voltage and current phases. When the active power has a negative value, the pumping unit is indicated to enter a feedback braking state, at the moment, the intelligent microgrid control module of the pumping unit outputs a controller signal to enable the rectification module to be conducted, and controllable rectification is realized by controlling the trigger angle of the controllable rectification module. After a plurality of continuous power generation cycles, if the stored electric energy of the storage battery reaches the upper limit of the capacity, the voltage of the battery is inevitably increased, and when the actual direct current voltage of the battery is higher than the maximum safe voltage of the battery, the controllable rectification module can be closed. And cutting off the electric loop of the power generation winding. If the energy storage battery is not connected with the electric equipment all the time and keeps the full-power state, the controllable rectification module is kept in the closed state all the time, and the oil pumping unit still feeds back to the power grid through the electric winding to generate power. After the well site power utilization equipment is connected, the energy storage battery discharges, the voltage drops, the controllable rectification module is conducted again at the moment to charge the energy storage battery, the controllable rectification module is closed until the battery is fully charged, and the process is repeated in a circulating mode, so that intelligent management and control of the micro-grid of the pumping unit are achieved.
Example two
As shown in fig. 2, in the present embodiment, a multi-winding motor self-generating microgrid system for an oil pumping unit is provided, which includes an oil pumping unit, a multi-winding motor, a controllable rectifier module, an energy storage battery, a DC/AC inverter, a microgrid intelligent control module and a power frequency grid; the pumping unit is connected with a rotor of the multi-winding motor, a stator of the multi-winding motor comprises an electric operation winding and a feedback power generation winding, the electric operation winding is connected with the power frequency power grid, the feedback power generation winding is connected with the controllable rectification module, the controllable rectification module is connected with the energy storage battery, and the energy storage battery is connected with the DC/AC inverter; the multi-winding motor, the controllable rectifying module and the energy storage battery are all connected with the micro-grid intelligent control module.
In this embodiment, the self-generating microgrid system is connected to electrical equipment at a wellsite, the electrical equipment at the wellsite includes direct current electrical equipment and alternating current electrical equipment, the direct current electrical equipment is connected to the energy storage battery, and the alternating current electrical equipment is connected to the DC/AC inverter.
In this embodiment, the multi-winding motor is a multi-winding permanent magnet motor, the electric operating winding is provided with a first electric quantity collector and a power electronic device for controlling the start, stop and speed regulation of the electric operating winding, and the first electric quantity collector and the power electronic device are both connected with the microgrid intelligent control module; the feedback power generation winding is connected with the controllable rectification module, a second electric quantity collector is arranged on the feedback power generation winding, and the second electric quantity collector is connected with the micro-grid intelligent control module.
In this embodiment, the microgrid intelligent control module comprises a driving control unit, a first electric quantity acquisition unit, a power calculation unit, a second electric quantity acquisition unit, a rectification trigger unit and a battery management unit; the power electronic device is connected with the drive control unit, the first electric quantity collector is connected with the first electric quantity collection unit, the second electric quantity collector is connected with the second electric quantity collection unit, the controllable rectification module is connected with the rectification trigger unit, and the energy storage battery is connected with the battery management unit.
In this embodiment, the power calculation unit calculates the active power of the electric operation winding according to the voltage and the current of the electric operation winding acquired by the first electric quantity acquisition unit, and when the active power has a negative value, the oil pumping unit is indicated to enter a feedback braking state, and the drive control unit controls the power electronic device to be disconnected, so that the connection between the electric operation winding and the power frequency power grid is disconnected; meanwhile, the rectification trigger unit controls the controllable rectification module to start, so that controllable rectification is realized.
In this embodiment, when the motor continuously operates for a plurality of power generation cycles to enable the electric energy stored in the energy storage battery to reach the upper limit of the capacity, if the battery management unit detects that the real-time direct current voltage of the energy storage battery is higher than the preset maximum safe voltage, the rectification trigger unit controls the controllable rectification module to be turned off, and the connection between the feedback power generation winding and the well site power utilization equipment is disconnected; meanwhile, the drive control unit controls the power electronic device to be closed, and the connection between the electric operation winding and the power frequency power grid is conducted; when the motor continuously works for a plurality of power generation periods, the energy storage battery is not connected with well site electric equipment all the time and keeps a full power state, the controllable rectification module is always kept in a closed state, the driving control unit controls the power electronic device to be closed, the electric operation winding is connected to a power frequency power grid, and the oil pumping unit generates power through the electric operation winding; when the well site power utilization equipment is connected, the energy storage battery discharges, the rectification trigger module controls the controllable rectification module to start, the feedback power generation winding charges the energy storage battery until the energy storage battery is fully charged, the rectification trigger module controls the controllable rectification module to close, the driving control unit controls the power electronic device to close, and the electric operation winding is connected to the power frequency power grid.
The multi-winding permanent magnet motor is characterized in that the permanent magnet motor for driving the oil pumping unit is of a multi-winding structure, wherein some windings are used for a motor, other windings are used for generating electricity, and the motor windings and the generating windings alternately and circularly reciprocate according to the mechanical energy load characteristic of the oil pumping unit. The self-generating micro-grid system means that the generated energy of the permanent magnet motor does not need to be fed back to a power grid, but forms a local micro-grid automatically to supply power to auxiliary supporting equipment of an oil well.
The technology integrates the functions of a motor and a generator on one permanent magnet motor. The system comprises the following components: the system comprises an oil pumping unit, a permanent magnet motor with multiple windings, a controllable rectification module, an energy storage battery, a DC/AC inverter, a micro-grid intelligent control module and well site electric equipment (direct current equipment and alternating current equipment).
Permanent magnet of a rotor of the permanent magnet motor can be excited independently, the rotor of the permanent magnet motor rotates under the drive of mechanical energy of the oil pumping unit, a permanent magnet field of the rotor rotates to cut a power generation winding, so that power generation operation of a feedback winding is achieved, and power generation energy of the permanent magnet motor is stored by a rectification module and a storage battery and then supplies power to well site alternating current electric equipment through a DC/AC inverter.
Different from an asynchronous motor rotor which does not have an independent excitation magnetic field and has to be connected into a power frequency power grid to realize power generation, the electric winding and the power generation winding of the permanent magnet motor can run independently of each other, when the pumping unit enters a reverse power generation state, the electric winding of power frequency alternating current power supply can be cut off, and the power generation winding is conducted, so that mechanical energy can be generated completely through the power generation winding, and the power generation energy utilization rate is improved. When the reverse power generation state is finished and the electric state is entered, the power generation winding is disconnected and the electric winding is conducted, so that the automatic switching between the electric state and the power generation state is realized, and the periodical conduction and switching between the electric state and the power generation state are realized in cycles.
Because the motor is provided with the electric winding and the power generation winding which are mutually independent, the optimal design can be carried out according to respective requirements when the winding structure is designed, and the design contradiction that the traditional motor only has one set of winding and can not give consideration to the electric and power generation performances is avoided. Meanwhile, the electric winding and the power generation winding are alternately and circularly conducted, and the reverse power generation energy is utilized to the maximum extent. After the technical route is adopted, the power generation efficiency of the motor is greatly improved, and the power generation amount is improved by 8-12 times compared with that of the traditional asynchronous motor under the same working condition. By taking a typical pumping unit well site as an example, the single-day power consumption of a single oil well is calculated to be 200kwh, and after the technical route is adopted, 50-70kwh of power can be generated in a single day, the requirement of auxiliary power utilization equipment of the well site can be basically met, so that extra electric energy does not need to be required from a power grid, and the comprehensive power consumption of the well site is indirectly reduced.
For the intelligent micro-grid power generation system, a conduction time control system of an electric winding and a power generation winding and a battery energy management system are the core. Since the pumping unit has a periodic load characteristic, the control method is described here by taking the second complete working cycle in fig. 3 as an example. And in the 'operation of the electric winding', the electric winding is connected to a power frequency power grid, so that the motor-driven oil pumping unit can be ensured to normally operate. And calculating active power P = U I cos phi of the electric winding according to electric quantity collection data (voltage, current and the like) of the electric winding collected in real time, wherein U is voltage, I is current, and cos phi is a cosine value of an included angle between voltage and current phases. When the active power has a negative value, the pumping unit is indicated to enter a feedback braking state, the intelligent micro-grid control module outputs a controller signal at the moment, the electric winding is cut off, meanwhile, the rectifier module corresponding to the power generation winding is conducted, and controllable rectification is realized by controlling the trigger angle of the controllable rectifier module. After a plurality of continuous power generation cycles, if the stored electric energy of the storage battery reaches the upper limit of the capacity, the voltage of the battery is inevitably increased, and when the actual direct current voltage of the battery is higher than the maximum safe voltage of the battery, the controllable rectification module can be closed. And cutting off the electric loop of the power generation winding, and simultaneously conducting the electric winding loop, wherein the reverse power generation energy still returns to the power grid. If the energy storage battery is not connected with the power utilization equipment all the time and keeps a full power state, the controllable rectification module is always kept in a closed state, the electric winding is connected with a power frequency power grid, and the oil pumping unit still feeds back the power grid to generate electricity through the electric winding. After the well site power utilization equipment is connected, the energy storage battery discharges, the voltage drops, the controllable rectifying module is conducted again at the moment to charge the energy storage battery, the controllable rectifying module is closed and the electric winding is conducted until the battery is fully charged, and the process is repeated in a circulating mode, so that intelligent management and control of the micro-grid of the pumping unit are achieved.
EXAMPLE III
In this embodiment, a conventional inverted power generation energy utilization system architecture of an oil pumping unit is provided. Compared with the self-generating micro-grid system provided by the invention, the framework in fig. 4 only has one set of motor windings and simultaneously needs a frequency converter rectification and inversion unit, while the framework shown in fig. 1 and 2 comprises two sets of mutually independent windings, one set is used for electric operation, the other set is used for power generation operation, and simultaneously does not need the frequency converter rectification and inversion unit, meanwhile, the intelligent micro-grid controller can control the power generation energy in real time, can simultaneously provide a direct current power supply and an alternating current power supply through controllable rectification, battery energy storage and inversion, is isolated from a power frequency alternating current power grid, and can protect auxiliary power utilization equipment to a certain extent.
In the aspect of utilization of reverse power generation energy of the oil pumping unit, the current common method is to rectify power frequency alternating current into direct current for power supply by using a mode of a frequency converter, a conventional motor and an energy storage battery, and simultaneously hang an inverter on a direct current bus for driving the motor of the oil pumping unit, wherein energy is mainly transmitted on the direct current bus. The conventional motor feeds back energy to a direct current bus under the reverse dragging action of a transmission mechanism, and then stores the energy on energy storage elements such as a battery, a super capacitor and the like. Meanwhile, for a well site which does not need frequency conversion and speed regulation, the additionally added frequency converter also greatly increases equipment investment, and certain frequency converters cannot be paid for limited power generation and electric energy utilization rate.
The invention does not need a frequency converter, and simultaneously adopts the mutually independent electric winding and the power generation winding to decouple the power supply of the power frequency alternating current power grid and the well site micro-grid and mutually independently operate.
By adopting the technical scheme disclosed by the invention, the following beneficial effects are obtained:
the invention discloses a multi-winding motor self-generating micro-grid system for an oil pumping unit, which has the advantages that compared with the traditional motor, the generating efficiency is greatly improved, and the utilization rate of reverse generating electric energy is improved; the power generation and power utilization network is electrically decoupled from the power frequency alternating current power grid, so that the flexibility of the power grid is improved, and meanwhile, when the power supply network fails, the auxiliary electric equipment of the well site can be protected; equipment investment such as a frequency converter is not required to be added, so that the cost is saved; the intelligent micro-grid system can provide different power supplies such as direct current, single-phase alternating current, three-phase alternating current and the like, and has better adaptability to electric equipment; when the pumping unit is maintained, the motor is powered off and stops, and the transmission mechanism of the pumping unit can stop more quickly due to the energy feedback and the electric damping effect of the power generation winding.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements should also be considered within the scope of the present invention.
Claims (2)
1. The utility model provides a many windings motor are from generating electricity little grid system for beam-pumping unit which characterized in that: the system comprises an oil pumping unit, a multi-winding motor, a controllable rectification module, an energy storage battery, a DC/AC inverter, a micro-grid intelligent control module and a power frequency grid; the pumping unit is connected with a rotor of the multi-winding motor, a stator of the multi-winding motor comprises an electric operation winding and a feedback power generation winding, the electric operation winding is connected with the power frequency power grid, the feedback power generation winding is connected with the controllable rectification module, the controllable rectification module is connected with the energy storage battery, and the energy storage battery is connected with the DC/AC inverter; the multi-winding motor, the controllable rectifying module and the energy storage battery are all connected with the micro-grid intelligent control module;
when the multi-winding motor is a multi-winding asynchronous motor, a first electric quantity collector is arranged on the electric operation winding and is connected with the micro-grid intelligent control module; the feedback power generation winding is connected with the controllable rectification module, a second electric quantity collector is arranged on the feedback power generation winding, and the second electric quantity collector is connected with the micro-grid intelligent control module;
the micro-grid intelligent control module comprises a first electric quantity acquisition unit, a power calculation unit, a second electric quantity acquisition unit, a rectification trigger unit and a battery management unit; the first electric quantity collector is connected with the first electric quantity collection unit, the second electric quantity collector is connected with the second electric quantity collection unit, the controllable rectification module is connected with the rectification trigger unit, and the energy storage battery is connected with the battery management unit;
the power calculation unit calculates the active power of the electric operation winding according to the voltage and the current of the electric operation winding acquired by the first electric quantity acquisition unit, when the active power has a negative value, the pumping unit is indicated to enter a feedback braking state, and the rectification trigger unit controls the controllable rectification module to start so as to realize controllable rectification;
when the motor continuously works for a plurality of power generation cycles to enable the electric energy stored by the energy storage battery to reach the upper limit of the capacity, if the battery management unit detects that the real-time direct current voltage of the energy storage battery is higher than the preset maximum safe voltage, the rectification trigger unit controls the controllable rectification module to be closed, and the connection between the feedback power generation winding and the well site electric equipment is disconnected; when the motor continuously works for a plurality of power generation cycles, the energy storage battery is not connected with well site electric equipment all the time and keeps a full power state, the controllable rectification module is always kept in a closed state, and the oil pumping unit generates power through the electric operation winding; when the well site power utilization equipment is connected, the energy storage battery discharges, the rectification trigger module controls the controllable rectification module to start, the feedback power generation winding charges the energy storage battery, and the rectification trigger module controls the controllable rectification module to close until the energy storage battery is fully charged;
when the multi-winding motor is a multi-winding permanent magnet motor, a first electric quantity collector and a power electronic device for controlling the starting, the stopping and the speed regulation of the electric operation winding are arranged on the electric operation winding, and the first electric quantity collector and the power electronic device are both connected with the micro-grid intelligent control module; the feedback power generation winding is connected with the controllable rectification module, a second electric quantity collector is arranged on the feedback power generation winding, and the second electric quantity collector is connected with the micro-grid intelligent control module;
the micro-grid intelligent control module comprises a driving control unit, a first electric quantity acquisition unit, a power calculation unit, a second electric quantity acquisition unit, a rectification trigger unit and a battery management unit; the power electronic device is connected with the driving control unit, the first electric quantity collector is connected with the first electric quantity collection unit, the second electric quantity collector is connected with the second electric quantity collection unit, the controllable rectification module is connected with the rectification trigger unit, and the energy storage battery is connected with the battery management unit;
the power calculation unit calculates the active power of the electric operation winding according to the voltage and the current of the electric operation winding acquired by the first electric quantity acquisition unit, when the active power has a negative value, the pumping unit is indicated to enter a feedback braking state, and the driving control unit controls the power electronic device to be disconnected, so that the connection between the electric operation winding and a power frequency power grid is disconnected; meanwhile, the rectification trigger unit controls the controllable rectification module to start, so that controllable rectification is realized;
when the motor continuously works for a plurality of power generation cycles to enable the electric energy stored by the energy storage battery to reach the upper limit of the capacity, if the battery management unit detects that the real-time direct current voltage of the energy storage battery is higher than the preset maximum safe voltage, the rectification trigger unit controls the controllable rectification module to be closed, and the connection between the feedback power generation winding and the well site electric equipment is disconnected; meanwhile, the drive control unit controls the power electronic device to be closed, and the connection between the electric operation winding and the power frequency power grid is conducted; when the motor continuously works for a plurality of power generation periods, the energy storage battery is not connected with well site electric equipment all the time and keeps a full power state, the controllable rectification module is always kept in a closed state, the driving control unit controls the power electronic device to be closed, the electric operation winding is connected to a power frequency power grid, and the oil pumping unit generates power through the electric operation winding; when the well site power utilization equipment is connected, the energy storage battery discharges, the rectification trigger module controls the controllable rectification module to start, the feedback power generation winding charges the energy storage battery until the energy storage battery is fully charged, the rectification trigger module controls the controllable rectification module to close, the driving control unit controls the power electronic device to close, and the electric operation winding is connected to the power frequency power grid.
2. The self-generating microgrid system of a multi-winding motor for an oil pumping unit as recited in claim 1, characterized in that: the self-generating micro-grid system is connected with well site electric equipment, the well site electric equipment comprises direct current electric equipment and alternating current electric equipment, the direct current electric equipment is connected with the energy storage battery, and the alternating current electric equipment is connected with the DC/AC inverter.
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| CN2282746Y (en) * | 1996-12-18 | 1998-05-27 | 石油大学(华东) | Energy-saving motor for pumping unit |
| CN1188340A (en) * | 1997-01-15 | 1998-07-22 | 石油大学(华东) | Winding energy-saving motor and controller for beam-pumping unit |
| CN100576699C (en) * | 2007-10-16 | 2009-12-30 | 刘建平 | Double winding asynchronous motor |
| CN103061990B (en) * | 2012-12-21 | 2016-04-13 | 张建洲 | A kind of renewable energy source microgrid system of oil-field oil pumper |
| CN104065229A (en) * | 2014-06-10 | 2014-09-24 | 华中科技大学 | Electric power generation integration inductor motor |
| CN106292569A (en) * | 2015-06-09 | 2017-01-04 | 中国石油化工股份有限公司 | Oil pumper gang of wells soft drive control system |
| CN105119311B (en) * | 2015-07-30 | 2019-02-05 | 中国石油大学(北京) | Control system and control method of oil pumping unit |
| CN108879908A (en) * | 2017-05-12 | 2018-11-23 | 中国石油化工股份有限公司 | A kind of recycling pumping unit falls the energy recovery utilizing system of generated energy |
| CN207053259U (en) * | 2017-08-25 | 2018-02-27 | 宏扬创能(北京)电气科技有限公司 | Dc bus oil pumper micro-capacitance sensor intelligent group control device and system |
| CN110816306A (en) * | 2018-07-23 | 2020-02-21 | 中车株洲电力机车研究所有限公司 | Diesel power generation electric drive whole vehicle system and vehicle |
| CN110311413B (en) * | 2019-07-24 | 2020-11-24 | 华北电力大学 | A multi-winding synchronous motor pair system suitable for multi-converter drive |
| CN111055918B (en) * | 2019-12-18 | 2021-01-08 | 南京航空航天大学 | Dual-motor steer-by-wire system based on dual-winding motor and control method thereof |
| CN212033938U (en) * | 2020-04-28 | 2020-11-27 | 山西牛魔王机电科技有限公司 | Range-extending power generation motor of electric vehicle |
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| US12444910B2 (en) | 2022-11-01 | 2025-10-14 | Typhon Technology Solutions (U.S.), Llc | Method for accessing electric grids to power fracturing operations |
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Denomination of invention: A Multi winding Motor Self generating Microgrid System for Oil Pumping Units Effective date of registration: 20230913 Granted publication date: 20210507 Pledgee: Qinhuangdao Funing Rural Credit Union Co.,Ltd. Pledgor: Tianjin Minchang Technology Co.,Ltd. Registration number: Y2023980056715 |
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