CN114204600A - Alternating-current self-synchronizing wind power generation system and working method thereof - Google Patents

Alternating-current self-synchronizing wind power generation system and working method thereof Download PDF

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Publication number
CN114204600A
CN114204600A CN202111533308.9A CN202111533308A CN114204600A CN 114204600 A CN114204600 A CN 114204600A CN 202111533308 A CN202111533308 A CN 202111533308A CN 114204600 A CN114204600 A CN 114204600A
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Prior art keywords
energy
direct current
wind
power generation
power
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CN202111533308.9A
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Chinese (zh)
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曹永吉
张恒旭
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Shandong University
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Shandong University
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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
    • H02J3/381—Dispersed generators
    • 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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • 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
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The invention discloses an alternating current self-synchronizing wind power generation system and a method, comprising the following steps: the wind turbine, the gear box, the asynchronous generator, the power electronic converter, the direct current motor and the synchronous generator are connected in sequence; the gearbox can transmit mechanical energy generated by the wind turbine to the asynchronous generator, the asynchronous generator can convert the mechanical energy into alternating current energy, the power electronic converter can convert the alternating current energy into direct current energy required by the direct current motor, the direct current motor can convert the direct current energy into mechanical energy and transmit the mechanical energy to the synchronous generator, and the mechanical energy is converted into the alternating current energy by the synchronous generator and transmitted to a power grid.

Description

Alternating-current self-synchronizing wind power generation system and working method thereof
Technical Field
The invention relates to the field of new energy power generation in a power system, in particular to an alternating current self-synchronizing wind power generation system and a working method thereof.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Wind power generation, the most mature and scaled form of renewable energy power generation technology with no pollution, has reached a high level of permeability in the grid. Because the grid-connected power electronic device isolates the frequency fluctuation at the side of the power grid, the wind turbine does not provide equivalent rotational inertia for the power grid in the operation process and does not participate in primary frequency modulation of the power grid. With the large-scale application of wind power generation, the proportion of thermal power generating units is correspondingly reduced, so that the active power control resources of a power grid are reduced, and the frequency stability of a power system faces huge challenges. In addition, the problem of poor interference resistance of the power electronic device is more obvious. The frequency and voltage variations can easily cause the wind power generation to be disconnected, further exacerbating the frequency stability problem.
In the prior art, a mainstream wind power generation system is connected with a power grid through a power electronic converter. However, the following technical problems often exist:
(1) most wind power generation systems operate in a maximum power tracking mode, do not provide active power for standby and do not participate in active power response of a power grid; the power electronic converter isolates the frequency fluctuation at the side of the power grid, and the wind power generation system does not provide equivalent rotational inertia for the power grid in the operation process and does not participate in primary frequency modulation of the power grid; therefore, the equivalent inertia of the power grid is reduced, and the primary frequency modulation capability is insufficient.
(2) Although the adjustment control strategy can enable the power electronic converter to simulate the inertia response and primary frequency modulation of the synchronous unit, the mechanical energy stored in the internal rotating device of the wind power generation system is limited, and effective inertia and active reserve cannot be provided for the power system.
(3) The wind power generation system takes the power electronic converter as an interface between the wind power generation system and a power grid, and due to poor anti-interference performance of the power electronic converter, when the frequency and the voltage of the power grid fluctuate, the interlocking disconnection of the wind power generation system is easily caused, and the severity of accidents is aggravated.
Therefore, the existing wind power generation system cannot provide equivalent inertia and active reserve for a power system, has the problem of weak immunity, cannot well meet the requirement of frequency stability control, and limits the large-scale access of renewable energy sources in a power grid.
Disclosure of Invention
In order to solve the problems, the invention provides an alternating current self-synchronizing wind power generation system and a working method thereof, which can increase mechanical energy stored in a wind power system, improve the active standby capacity of wind power generation, improve the immunity of wind power generation and realize synchronous grid connection of wind power generation.
In some embodiments, the following technical scheme is adopted:
an alternating current self-synchronizing wind power generation system comprising: the wind turbine, the gear box, the asynchronous generator, the power electronic converter, the direct current motor and the synchronous generator are connected in sequence;
the gearbox can transmit mechanical energy generated by the wind turbine to the asynchronous generator, the asynchronous generator can convert the mechanical energy into alternating current energy, the power electronic converter can convert the alternating current energy into direct current energy required by the direct current motor, the direct current motor can convert the direct current energy into mechanical energy and transmit the mechanical energy to the synchronous generator, and the mechanical energy is converted into the alternating current energy by the synchronous generator and transmitted to a power grid.
In other embodiments, the following technical solutions are adopted:
an alternating current self-synchronizing wind power generation method comprises the following steps:
converting wind energy into mechanical energy through a wind turbine, and transmitting the mechanical energy to an asynchronous generator through a gearbox;
the asynchronous generator converts mechanical energy into alternating current energy, and the alternating current energy is converted into direct current energy by the power electronic converter and then transmitted to the direct current motor;
the direct current motor converts direct current electric energy into mechanical energy and transmits the mechanical energy to the synchronous generator;
the synchronous generator further converts the mechanical energy into alternating current energy and transmits the alternating current energy to the power grid.
Compared with the prior art, the invention has the beneficial effects that:
(1) the wind power generation is connected with a direct current motor and a synchronous generator through a power electronic converter and then is connected with a power grid; the synchronous grid connection of wind power generation is realized, the inertia response capability is better, and the primary frequency modulation characteristic is better under the control of a speed regulator; the number of rotating devices in the wind power generation system is increased, mechanical energy stored in the wind power generation system is improved, and active standby of wind power generation is improved; the anti-interference performance of the wind power generation system is enhanced, and the off-grid problem caused by the frequency and voltage deviation of a power grid is improved; the active power standby can be well provided for a power grid, the power grid friendliness of wind power generation and the power grid frequency stability control capability are improved, and large-scale grid connection of wind power generation is promoted.
(2) The invention is simple to install, is suitable for further upgrading the existing wind power generation system and thermal power generation system, and is a novel renewable energy power generation system with great popularization prospect.
Additional features and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic structural diagram of an AC self-synchronizing wind power generation system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an energy conversion process in an embodiment of the invention;
FIG. 3 is a flow chart of an AC self-synchronizing wind power generation method according to an embodiment of the present invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example one
In one or more embodiments, an ac self-synchronizing wind power generation system is disclosed, with reference to fig. 1, comprising: the wind turbine, the gear box, the asynchronous generator, the power electronic converter, the direct current motor and the synchronous generator are connected in sequence;
the wind turbine comprises a wind turbine, a gearbox, a power electronic converter, a direct current motor, a synchronous generator, a power electronic converter and a power grid, wherein the gearbox can transmit mechanical energy generated by the wind turbine to the asynchronous generator, the asynchronous generator can convert the mechanical energy into alternating current energy, the power electronic converter can convert the alternating current energy into direct current energy required by the direct current motor, the direct current motor can convert the direct current energy into mechanical energy and transmit the mechanical energy to the synchronous generator, and the mechanical energy is converted into the alternating current energy through the synchronous generator and transmitted to the power grid.
In addition, still include: the device comprises a control module, a monitoring module, an excitation module and a display module, wherein the control module is respectively connected with a wind turbine, a gear box, a power electronic converter, the monitoring module, the excitation module and the display module; the monitoring module is used for acquiring the running state data of other equipment and transmitting the running state data to the control module. The excitation module is also connected with the synchronous generator and used for controlling the grid-connected voltage of the synchronous generator. And the display module is used for displaying the control parameters and the running state parameters in real time.
Specifically, in the present embodiment, the wind turbine is responsible for converting wind energy into mechanical energy; the gear box is responsible for controlling the rotating speed of the asynchronous generator; the asynchronous generator is responsible for converting mechanical energy into alternating current energy; the power electronic converter is used for converting alternating current electric energy generated by the asynchronous motor into direct current electric energy required by the direct current motor; the direct current motor is responsible for converting direct current electric energy into mechanical energy and transmitting the mechanical energy to the synchronous generator; the synchronous generator is used for converting mechanical energy into alternating current energy and transmitting the alternating current energy to a power grid; the excitation module is responsible for controlling the grid-connected voltage of the synchronous generator; the control module can control the angle of the wind turbine, the rotating speed transformation ratio of the gear box, the output power of the power electronic converter and the excitation voltage of the synchronous generator; the monitoring module can monitor relevant operating parameters of the wind turbine, the gear box, the asynchronous generator, the power electronic converter, the direct current motor, the synchronous generator and the excitation module and transmit the operating parameters to the control module; the display module can display control parameters of the wind turbine, the gear box, the power electronic converter and the excitation module in real time, and can display relevant operation parameters of the wind turbine, the gear box, the asynchronous generator, the power electronic converter, the direct current motor, the synchronous generator and the excitation module in real time.
With reference to fig. 2, the energy conversion process of the above system is as follows: the wind turbine converts wind energy into mechanical energy, and the mechanical energy is transmitted to the asynchronous generator through the gearbox; the asynchronous generator converts mechanical energy into alternating current energy, and the alternating current energy is converted into direct current energy by the power electronic converter and then transmitted to the direct current motor; the direct current motor converts direct current electric energy into mechanical energy and transmits the mechanical energy to the synchronous generator; the synchronous generator further converts the mechanical energy into alternating current energy and transmits the alternating current energy to the power grid.
Wherein, the power relation between the wind turbine and the power grid is,
PG＝PW·cw·cp·cd·ct
wherein, PWWind energy captured for a wind turbine; pGThe power generation internet power of the invention; c. CwEfficiency of energy transfer from the wind turbine to the asynchronous generator; c. CpIs the energy transfer coefficient from the asynchronous motor to the direct current motor; c. CdThe efficiency of energy transfer from the DC motor to the synchronous generator; c. CtIs the efficiency of the energy transfer from the synchronous generator to the grid.
Example two
In one or more embodiments, an ac self-synchronizing wind power generation method is disclosed, which is based on the system in the first embodiment, and with reference to fig. 3, the method includes the following processes:
the user sets the control parameters of the invention by using the control module; the wind turbine converts wind energy into mechanical energy, and the mechanical energy is transmitted to the asynchronous generator through the gearbox; the asynchronous generator converts mechanical energy into alternating current energy, and the alternating current energy is converted into direct current energy by the power electronic converter and then transmitted to the direct current motor; the direct current motor converts direct current electric energy into mechanical energy and transmits the mechanical energy to the synchronous generator; the synchronous generator further converts the mechanical energy into alternating current energy and transmits the alternating current energy to the power grid.
The specific implementation of the above process has been described in the first embodiment, and is not described in detail here.
The system and the method of the embodiment can realize the synchronization grid connection of wind power generation, enhance the mechanical energy stored in the wind power generation system and improve the active power reserve of the wind power generation; the wind power grid-off accident caused by frequency and voltage deviation can be reduced; the active power support can be actively provided for a power grid, the power grid friendliness of wind power generation is enhanced, the frequency stability control capability of the power grid is improved, and large-scale grid connection of wind power generation is promoted; the defects that the existing wind power generation system is poor in noise immunity and cannot provide equivalent inertia and active power reserve for a power grid well are overcome.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.

Claims (9)

1. An alternating current self-synchronizing wind power generation system, comprising: the wind turbine, the gear box, the asynchronous generator, the power electronic converter, the direct current motor and the synchronous generator are connected in sequence;
the gearbox can transmit mechanical energy generated by the wind turbine to the asynchronous generator, the asynchronous generator can convert the mechanical energy into alternating current energy, the power electronic converter can convert the alternating current energy into direct current energy required by the direct current motor, the direct current motor can convert the direct current energy into mechanical energy and transmit the mechanical energy to the synchronous generator, and the mechanical energy is converted into the alternating current energy by the synchronous generator and transmitted to a power grid.
2. The ac self-synchronizing wind power generation system according to claim 1, further comprising: the control module is respectively connected with the wind turbine, the gear box, the power electronic converter and the monitoring module; the monitoring module is used for acquiring the running state data of other equipment and transmitting the running state data to the control module.
3. The ac self-synchronizing wind power generation system according to claim 2, further comprising: the excitation module is respectively connected with the control module and the monitoring module; the excitation module is also connected with the synchronous generator and used for controlling the grid-connected voltage of the synchronous generator.
4. The ac self-synchronizing wind power generation system according to claim 2, further comprising: and the display module is connected with the control module and is used for displaying the control parameters and the running state parameters in real time.
5. The AC self-synchronizing wind power generation system according to claim 1, wherein the power relationship between the wind turbine and the power grid is as follows:
PG＝PW·cw·cp·cd·ct
wherein, PWWind energy captured for a wind turbine; pGPower is used for power generation and surfing the internet; c. CwEfficiency of energy transfer from the wind turbine to the asynchronous generator; c. CpIs the energy transfer coefficient from the asynchronous motor to the direct current motor; c. CdIs the efficiency of the energy transfer from the dc motor to the synchronous generator; c. CtIs the efficiency of the energy transfer from the synchronous generator to the grid.
6. An alternating current self-synchronizing wind power generation method is characterized by comprising the following steps:
converting wind energy into mechanical energy through a wind turbine, and transmitting the mechanical energy to an asynchronous generator through a gearbox;
the asynchronous generator converts mechanical energy into alternating current energy, and the alternating current energy is converted into direct current energy by the power electronic converter and then transmitted to the direct current motor;
the direct current motor converts direct current electric energy into mechanical energy and transmits the mechanical energy to the synchronous generator;
the synchronous generator further converts the mechanical energy into alternating current energy and transmits the alternating current energy to the power grid.
7. The AC self-synchronizing wind power generation method according to claim 6, wherein the power relationship between the wind turbine and the power grid is as follows:
PG＝PW·cw·cp·cd·ct
wherein, PWWind energy captured for a wind turbine; pGPower is used for power generation and surfing the internet; c. CwEfficiency of energy transfer from the wind turbine to the asynchronous generator; c. CpIs the energy transfer coefficient from the asynchronous motor to the direct current motor; c. CdIs the efficiency of the energy transfer from the dc motor to the synchronous generator; c. CtIs the efficiency of the energy transfer from the synchronous generator to the grid.
8. The ac self-synchronous wind power generation method of claim 6, further comprising: monitoring relevant operation parameters of a wind turbine, a gear box, an asynchronous generator, a power electronic converter, a direct current motor, a synchronous generator and an excitation module in real time; and controlling the angle of the wind turbine, the rotating speed transformation ratio of the gear box, the output power of the power electronic converter and the excitation voltage of the synchronous generator based on the operating parameters.
9. The ac self-synchronous wind power generation method of claim 6, further comprising: and the control parameters of the wind turbine, the gear box, the power electronic converter and the excitation module are displayed in real time, and the relevant operation parameters of the wind turbine, the gear box, the asynchronous generator, the power electronic converter, the direct current motor, the synchronous generator and the excitation module are displayed in real time.
CN202111533308.9A 2021-12-15 2021-12-15 Alternating-current self-synchronizing wind power generation system and working method thereof Pending CN114204600A (en)

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Publication number Priority date Publication date Assignee Title
CN201802563U (en) * 2010-09-30 2011-04-20 华锐风电科技(集团)股份有限公司 Full-power squirrel-cage set wind power generation apparatus
CN103398851A (en) * 2013-08-06 2013-11-20 株洲变流技术国家工程研究中心有限公司 Power equipment test device and system and returned energy adjustment method
CN103943009A (en) * 2014-04-17 2014-07-23 武汉新能源接入装备与技术研究院有限公司 Simulated wind power generation grid connection experimental system
CN105244911A (en) * 2015-10-23 2016-01-13 华北电力大学 High permeability new energy power grid connection system and stability control method
CN105656081A (en) * 2016-03-03 2016-06-08 北京清能世福科技有限公司 Large-capacity new energy power generation system
CN205595804U (en) * 2016-03-21 2016-09-21 广西电网有限责任公司电力科学研究院 Double -fed aerogenerator system
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CN106786787A (en) * 2017-02-14 2017-05-31 北京清能世福科技有限公司 A kind of grid-connected Large Copacity energy-accumulating power station of synchronized motor
CN110504711A (en) * 2019-08-21 2019-11-26 华北电力大学 A kind of new-energy grid-connected control system and method based on new energy synchronous machine
CN111416381A (en) * 2020-02-28 2020-07-14 贵州电网有限责任公司 New energy grid connection method applied to new energy power generation system

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201802563U (en) * 2010-09-30 2011-04-20 华锐风电科技(集团)股份有限公司 Full-power squirrel-cage set wind power generation apparatus
CN103398851A (en) * 2013-08-06 2013-11-20 株洲变流技术国家工程研究中心有限公司 Power equipment test device and system and returned energy adjustment method
CN103943009A (en) * 2014-04-17 2014-07-23 武汉新能源接入装备与技术研究院有限公司 Simulated wind power generation grid connection experimental system
US20160285400A1 (en) * 2015-03-27 2016-09-29 Huazhong University Of Science And Technology Power supply system and control method therefor
CN105244911A (en) * 2015-10-23 2016-01-13 华北电力大学 High permeability new energy power grid connection system and stability control method
CN105656081A (en) * 2016-03-03 2016-06-08 北京清能世福科技有限公司 Large-capacity new energy power generation system
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CN106786787A (en) * 2017-02-14 2017-05-31 北京清能世福科技有限公司 A kind of grid-connected Large Copacity energy-accumulating power station of synchronized motor
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CN111416381A (en) * 2020-02-28 2020-07-14 贵州电网有限责任公司 New energy grid connection method applied to new energy power generation system

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