CN202633966U - System for controlling low voltage ride through of aerogenerator - Google Patents
System for controlling low voltage ride through of aerogenerator Download PDFInfo
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- CN202633966U CN202633966U CN2012201888079U CN201220188807U CN202633966U CN 202633966 U CN202633966 U CN 202633966U CN 2012201888079 U CN2012201888079 U CN 2012201888079U CN 201220188807 U CN201220188807 U CN 201220188807U CN 202633966 U CN202633966 U CN 202633966U
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- 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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- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The utility model discloses a system for controlling low voltage ride through (LVRT) of an aerogenerator. The system comprises a direct-drive aerogenerator, a generator side converter, a network side converter, an energy storage device, an unloading circuit, a voltage detection device and an LVRT control module, wherein the direct-drive aerogenerator is in series connection with electrical network via the generator side converter and the network side converter, the input end of the energy storage device is connected with the aerogenerator and the output end of same is connected to the electrical network, the unloading circuit is connected between the generator side converter and the network side converter in parallel, the input end of the voltage detection device is connected with the electrical network and the output end of same is connected with the LVRT control module, and the LVRT control module is electrically connected with the energy storage device and the unloading circuit. According to the utility model, when the voltage of the electrical network drops, wide voltage fluctuations of electromagnetic torques and dc side buses are effectively inhibited; and when the electrical network is recovered, voltage and power supports are provided; thus, the aerogenerator can always keep connected with the electrical network, the LVRT function is better, the stability of the power system is improved, and the system of the utility model is suitable for popularization and application in wind generator systems.
Description
Technical field
The utility model relates to a kind of low-voltage and passes through control system, especially relates to the wind-driven generator low-voltage of utilizing wind power generation and passes through control system.
Background technology
Along with the fast development of China's economy, cause energy resource consumption sharply to increase, make China in following a period of time, to be faced with energy predicament for a long time, and development comprise that the regenerative resource of wind power generation is the final way that solves domestic energy predicament.
In recent years, utilize the wind generator system of wind power generation to obtain greatly developing in China, wind-powered electricity generation proportion constantly increases in the electrical network; But, in the actual power process, because wind energy is a kind of can not artificially control and extremely unsettled energy; Off and on, again owing to electrical network often breaks down, thereby usually cause electric network electric voltage drop when working; And when electric network electric voltage drop; Because existing wind generator system can not be realized low-voltage effectively and pass through function, cause wind-driven generator can not keep being connected with the normal of electrical network, thereby greatly reduce the stability of electric power system.
Summary of the invention
The technical problem that the utility model will solve provides a kind of when electric network electric voltage drop, can be effectively and realize that better low-voltage passes through function, thus the wind-driven generator low-voltage that improves stability of power system is passed through control system.
For solving the problems of the technologies described above; The utility model adopts a kind of like this wind-driven generator low-voltage to pass through control system, and this system comprises that direct-driving type wind power generation machine, pusher side converter, grid side converter, energy storage device, discharging circuit, voltage check device and low-voltage pass through control module; Said direct-driving type wind power generation machine is connected serially to electrical network through said pusher side converter and grid side converter; The input of said energy storage device connects the direct-driving type wind power generation machine, and output connects electrical network; Parallelly connected said discharging circuit between said pusher side converter and the grid side converter; The input of said voltage check device connects electrical network, and output connects said low-voltage and passes through control module; Said low-voltage is passed through control module and is electrically connected with said energy storage device and discharging circuit.
As a kind of preferred implementation of the utility model, said energy storage device adopts super capacitor, chemical energy-storage battery or mechanical energy storing device; Said discharging circuit comprises insulated gate polar form power tube IGBT and resistance R; The output that said low-voltage is passed through control module connects the control end G of said insulated gate polar form power tube IGBT; The E utmost point of said insulated gate polar form power tube IGBT is connected with an end of resistance R, and the C utmost point of the other end of said resistance R and insulated gate polar form power tube IGBT is electrically connected with said grid side converter respectively; Said voltage check device is used for network voltage detection, and with detected line voltage U
sImport said low-voltage in real time into and pass through control module.
As another preferred implementation of the utility model, said low-voltage is passed through control module and is comprised energy storage device determination module, discharging circuit determination module, detection computations module and switching trigger module; Described energy storage device determination module is through the detection of said voltage check device to line voltage, with detected line voltage U
sImport the energy storage device determination module in real time into; Compare with the voltage magnitude under the predefined normal condition; When being lower than rated voltage; The energy storage device determination module will send the input signal to said switching trigger module, start said energy storage device, and the energy storage device determination module sends energy storage device enabling signal to the discharging circuit determination module simultaneously; Described discharging circuit determination module is by the monitoring of the sensor in real time in said pusher side converter DC side busbar voltage; And signal imported in the discharging circuit determination module compare with set-point, comparative result is sent to the switching trigger module and is used for dropping into and excising said discharging circuit; Described detection computations module will go out DC side busbar voltage peak value according to the electric voltage dropping depth estimation; And transmit signals to the discharging circuit determination module; When the DC side busbar voltage is higher than rated value and is lower than the fault peak value; Through the said discharging circuit energy of releasing, the discharging circuit determination module is sent to the energy storage device determination module with the input signal of said discharging circuit simultaneously, and the energy storage device determination module imports signal into the switching trigger module and energy storage device is excised; Described switching trigger module is used to control the input and the excision of said energy storage device and discharging circuit.
After adopting such structure, be the direct-driving type wind power generation machine because the utility model adopts, thereby not only make the generating efficiency of wind generator system under low wind conditions higher; Can utilize wind energy better; And the frequency converter of direct-driving type wind power generation machine can be directly with the power delivery of sending to electrical network, thereby simplified system configuration greatly, in addition; Because the direct-driving type wind power generation machine has saved perishable gear box, thereby greatly reduces maintenance cost.The utility model when changing at wind speed when causing the Power Output for Wind Power Field fluctuation, is to reduce the impact of wind energy turbine set to electrical network in the course of the work, through energy storage device output or absorb certain active power to stabilize power fluctuation; When electric network fault causes electric voltage dropping; The power that outputs to electrical network because of wind energy turbine set descends; And the mechanical output that is input to wind energy turbine set is constant basically; The utility model absorbs certain active power through energy storage device, thus the problems such as the charging of DC link electric capacity, direct voltage fast rise, rotor acceleration and electromagnetic torque sudden change of avoiding the inner digestion of excess power to cause.When line voltage recovers; The utility model starts energy storage device also in time to electrical network feedback energy compensating power; Thereby the oscillation on large scale of DC side busbar voltage and rotor current torque when having avoided discharging circuit to cut out; Reduce the significantly change of power system restoration moment wind-driven generator active power and reactive power, strengthened the stability of electrical network.Because the utility model has adopted discharging circuit to cooperate control with energy storage device; And discharging circuit and energy storage device pass through its switching work of control module control by low-voltage; Therefore; The utility model can realize effectively when electric network electric voltage drop that not only low-voltage passes through function, and control more easily, the control better effects if.When this control system is slightly fallen at line voltage; Improved the low voltage ride-through capability of direct-driving type wind power generation machine; And when line voltage significantly falls; Improved the runnability of direct-driving type wind power generation system, the stator of generator, rotor current when having limited electric voltage dropping have improved the stability of electric power system.
Description of drawings
Below in conjunction with accompanying drawing the embodiment of the utility model is done further to specify.
Fig. 1 passes through a kind of structural representation of control system for the utility model wind-driven generator low-voltage.
Fig. 2 passes through a kind of block diagram of control module for low-voltage in the utility model.
Embodiment
Pass through control system referring to Fig. 1, a kind of wind-driven generator low-voltage shown in 2, this system comprises that direct-driving type wind power generation machine 1, pusher side converter 2, grid side converter 3, energy storage device 4, discharging circuit 5, voltage check device 6 and low-voltage pass through control module 7; Said direct-driving type wind power generation machine 1 is connected serially to electrical network through said pusher side converter 2 with grid side converter 3; The input of said energy storage device 4 connects direct-driving type wind power generation machine 1, and output connects electrical network; Parallelly connected said discharging circuit 5 between said pusher side converter 2 and the grid side converter 3; The input of said voltage check device 6 connects electrical network, and output connects said low-voltage and passes through control module 7; Said low-voltage is passed through control module 7 and is electrically connected with discharging circuit 5 with said energy storage device 4.In the utility model, draught fan impeller 8 is connected with direct-driving type wind power generation machine 1, and the stator of direct-driving type wind power generation machine 1 directly inserts electrical network, and rotor inserts electrical network through said pusher side converter 2 and grid side converter 3; Said energy storage device 4 one ends connect the rotor of direct-driving type wind power generation machine 1, and the other end inserts electrical network.
In the utility model; Said energy storage device 4 is a kind of in super capacitor, chemical energy-storage battery or the mechanical energy storing device preferably, is parallel to the rotor-side and the grid side of direct-driving type wind power generation machine 1, and electric energy is stored and discharges; The power that the balance electrical network requires suppresses power fluctuation; When electrical network broke down, energy storage device 4 can be used for storing the excess energy of DC side accumulation, and when electric network fault excise, energy storage device 4 can release energy, to the electrical network feedback power with the support line voltage.Said discharging circuit 5 preferably includes insulated gate polar form power tube IGBT and resistance R; The output that said low-voltage is passed through control module 7 connects the control end G of said insulated gate polar form power tube IGBT; The E utmost point of said insulated gate polar form power tube IGBT is connected with an end of resistance R; The C utmost point of the other end of said resistance R and insulated gate polar form power tube IGBT is electrically connected with said grid side converter 3 respectively; When work, the difference of DC side busbar voltage rated value and DC side busbar voltage actual value Udc is imported as hysteresis comparator, and its output is used to drive insulated gate polar form power tube IGBT.When DC side busbar voltage rated value during greater than DC side busbar voltage actual value Udc, insulated gate polar form power tube IGBT turn-offs, current transformer stable operation; When DC side busbar voltage actual value Udc was higher than rated value and is lower than the fault peak value, IGBT was open-minded for insulated gate polar form power tube, and dc bus capacitor is through the resistance R energy of releasing, and overvoltage is able to eliminate; Said voltage check device 6 is used for network voltage detection, and with detected line voltage U
sImport said low-voltage in real time into and pass through control module 7.
As a kind of preferred implementation of the utility model, as shown in Figure 2, said low-voltage is passed through control module 7 and is comprised energy storage device determination module, discharging circuit determination module, detection computations module and switching trigger module; Described energy storage device determination module is through the detection of 6 pairs of line voltages of said voltage check device, with detected line voltage U
sImport the energy storage device determination module in real time into; Compare with the voltage magnitude under the predefined normal condition; When being lower than rated voltage; The energy storage device determination module will send the input signal to said switching trigger module, start said energy storage device 4, and the energy storage device determination module sends energy storage device enabling signal to the discharging circuit determination module simultaneously; Described discharging circuit determination module is by the monitoring of the sensor in real time in the said pusher side converter 2 DC side busbar voltage; And signal imported in the discharging circuit determination module compare with set-point, comparative result is sent to the switching trigger module and is used for dropping into and excising said discharging circuit 5; Described detection computations module will go out DC side busbar voltage peak value according to the electric voltage dropping depth estimation; And transmit signals to the discharging circuit determination module; When the DC side busbar voltage is higher than rated value and is lower than the fault peak value; Through said discharging circuit 5 energy of releasing, the discharging circuit determination module is sent to the energy storage device determination module with the input signal of said discharging circuit 5 simultaneously, and the energy storage device determination module imports signal into the switching trigger module and with energy storage device 4 excisions; Described switching trigger module is used to control the input and the excision of said energy storage device 4 and discharging circuit 5.
Referring to Fig. 1, the low-voltage of the utility model is passed through control module 7 both can harvester side converter 2 dc voltage values, the line voltage value, can send control command again simultaneously, the input and the excision of control energy storage device 4 and discharging circuit 5.
The utility model realizes that low-voltage passes through below the process of function: when electrical network breaks down when causing line voltage significantly to fall in the course of the work; The rotor current of direct-driving type wind power generation machine 1 increases sharply at this moment; As shown in Figure 2; Through the detection of 6 pairs of line voltages of voltage check device, with detected line voltage U
sImport low-voltage into and pass through the energy storage device determination module in the control module 7; Compare with the voltage magnitude under the predefined normal condition; When being lower than rated voltage and deviation and reaching the degree of electrical network generation low voltage failure, the energy storage device determination module sends signal to the switching trigger module, and this module is sent enabling signals to energy storage device 4; Start energy storage device 4; The energy storage device determination module is to discharging circuit determination module feedback energy storage device 4 enabling signal simultaneously, and the meritorious and idle oscillation on large scale of pusher side current transformer is avoided in the rapid energy storage under the situation of rotor overcurrent of energy storage device 4 this moment, and at this moment discharging circuit 5 does not also drop into the loop.DC side busbar voltage actual value Udc is by the sensor in real time in the pusher side converter 2 monitoring, and signal imported in the discharging circuit determination module and with set-point compares, and comparative result is sent into the hysteresis comparator input; Its output is used to drive IGBT; Simultaneously signal is transferred to the detection computations module, this module goes out DC side busbar voltage peak value according to the electric voltage dropping depth estimation, and signal is sent into the discharging circuit determination module; When DC side busbar voltage actual value Udc is higher than rated value and is lower than the fault peak value; IGBT is open-minded, and dc bus capacitor is through the resistance R energy of releasing, and overvoltage is able to eliminate; The discharging circuit determination module feeds back to the energy storage device determination module with the input signal of discharging circuit 5 simultaneously; The energy storage device determination module imports signal into the switching trigger module and with energy storage device 4 excision, and promptly energy storage device 4 conditions each other with discharging circuit 5 so that input coefficient simultaneously, off-load after the first energy storage.When DC side busbar voltage rated value during greater than DC side busbar voltage actual value Udc, the switching trigger module sends the excision signal to discharging circuit 5, and IGBT turn-offs, current transformer stable operation.When fault is eliminated, when line voltage begins to recover, need a large amount of idle supports.Voltage check device 6 sends signal to the energy storage device determination module once more, according to the electrical network criterion, works as U
sDuring greater than 0.9 times of DC side busbar voltage rated value; Transmit signals in the switching trigger module; The switching trigger module sends enabling signal once more to energy storage device 4, and energy storage device 4 feeds back to electrical network with previously stored energy, thereby has weakened torque and meritorious concuss.Therefore, when electric network electric voltage drop, pass through the input and the excision of control module 7 control energy storage devices 4 and discharging circuit 5 by low-voltage; Promptly earlier absorb energy, again through discharging circuit 5 energy of releasing, at last again through this process of energy storage device 4 feedback energies through energy storage device 4; Effectively suppress the significantly change of electromagnetic torque, reactive power and DC bus-bar voltage; Limited rotor current, essential voltage and power support is provided during power system restoration, made direct-driving type wind power generation machine 1 keep being connected with electrical network all the time; Realized that better low-voltage passes through function, improved the stability of electric power system.
Claims (3)
1. a wind-driven generator low-voltage is passed through control system, it is characterized in that: this system comprises that direct-driving type wind power generation machine (1), pusher side converter (2), grid side converter (3), energy storage device (4), discharging circuit (5), voltage check device (6) and low-voltage pass through control module (7); Said direct-driving type wind power generation machine (1) is connected serially to electrical network through said pusher side converter (2) and grid side converter (3); The input of said energy storage device (4) connects direct-driving type wind power generation machine (1), and output connects electrical network; Parallelly connected said discharging circuit (5) between said pusher side converter (2) and the grid side converter (3); The input of said voltage check device (6) connects electrical network, and output connects said low-voltage and passes through control module (7); Said low-voltage is passed through control module (7) and is electrically connected with said energy storage device (4) and discharging circuit (5).
2. wind-driven generator low-voltage according to claim 1 is passed through control system, it is characterized in that: said energy storage device (4) is super capacitor, chemical energy-storage battery or mechanical energy storing device; Said discharging circuit (5) comprises insulated gate polar form power tube IGBT and resistance R; The output that said low-voltage is passed through control module (7) connects the control end G of said insulated gate polar form power tube IGBT; The E utmost point of said insulated gate polar form power tube IGBT is connected with an end of resistance R, and the C utmost point of the other end of said resistance R and insulated gate polar form power tube IGBT is electrically connected with said grid side converter (3) respectively; Said voltage check device (6) is used for network voltage detection, and with detected line voltage U
sImport said low-voltage in real time into and pass through control module (7).
3. wind-driven generator low-voltage according to claim 1 and 2 is passed through control system, it is characterized in that: said low-voltage is passed through control module (7) and is comprised energy storage device determination module, discharging circuit determination module, detection computations module and switching trigger module; Described energy storage device determination module is through the detection of said voltage check device (6) to line voltage, with detected line voltage U
sImport the energy storage device determination module in real time into; Compare with the voltage magnitude under the predefined normal condition; When being lower than rated voltage; The energy storage device determination module will send the input signal to said switching trigger module, start said energy storage device (4), and the energy storage device determination module sends energy storage device (4) enabling signal to the discharging circuit determination module simultaneously; Described discharging circuit determination module is by the monitoring of the sensor in real time in the said pusher side converter (2) DC side busbar voltage; And signal imported in the discharging circuit determination module compare with set-point, comparative result is sent to the switching trigger module and is used for dropping into and excising said discharging circuit (5); Described detection computations module will go out DC side busbar voltage peak value according to the electric voltage dropping depth estimation; And transmit signals to the discharging circuit determination module; When the DC side busbar voltage is higher than rated value and is lower than the fault peak value; Through said discharging circuit (5) energy of releasing, the discharging circuit determination module is sent to the energy storage device determination module with the input signal of said discharging circuit (5) simultaneously, and the energy storage device determination module imports signal into the switching trigger module and energy storage device (4) is excised; Described switching trigger module is used to control the input and the excision of said energy storage device (4) and discharging circuit (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201888079U CN202633966U (en) | 2012-04-28 | 2012-04-28 | System for controlling low voltage ride through of aerogenerator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012201888079U CN202633966U (en) | 2012-04-28 | 2012-04-28 | System for controlling low voltage ride through of aerogenerator |
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| CN202633966U true CN202633966U (en) | 2012-12-26 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151800A (en) * | 2013-03-25 | 2013-06-12 | 深圳科士达科技股份有限公司 | Grid-connected power recovery method and device for controlling photovoltaic inverter |
| CN103701149A (en) * | 2013-12-20 | 2014-04-02 | 浙江海得新能源有限公司 | Wind power generator grid fault ride-through device and method thereof |
| CN103944185A (en) * | 2014-04-22 | 2014-07-23 | 上海电机学院 | Double-fed asynchronous motor low-voltage ride through control system and method |
| CN105281624A (en) * | 2014-06-17 | 2016-01-27 | 松下知识产权经营株式会社 | Thermal power generation apparatus and thermal power generation system |
| CN105470990A (en) * | 2016-01-08 | 2016-04-06 | 镇江华东电力设备制造厂有限公司 | System and method for controlling low voltage ride through of high-power direct-driven permanent magnet wind power generation system |
| CN109193766A (en) * | 2018-09-18 | 2019-01-11 | 南京理工大学 | A kind of grid-connected fault traversing control method of MMC-HVDC based on DC energy storage device |
-
2012
- 2012-04-28 CN CN2012201888079U patent/CN202633966U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151800A (en) * | 2013-03-25 | 2013-06-12 | 深圳科士达科技股份有限公司 | Grid-connected power recovery method and device for controlling photovoltaic inverter |
| CN103151800B (en) * | 2013-03-25 | 2015-03-18 | 深圳科士达科技股份有限公司 | Grid-connected power recovery method and device for controlling photovoltaic inverter |
| CN103701149A (en) * | 2013-12-20 | 2014-04-02 | 浙江海得新能源有限公司 | Wind power generator grid fault ride-through device and method thereof |
| CN103944185A (en) * | 2014-04-22 | 2014-07-23 | 上海电机学院 | Double-fed asynchronous motor low-voltage ride through control system and method |
| CN105281624A (en) * | 2014-06-17 | 2016-01-27 | 松下知识产权经营株式会社 | Thermal power generation apparatus and thermal power generation system |
| CN105281624B (en) * | 2014-06-17 | 2021-04-06 | 松下知识产权经营株式会社 | Thermal power generation device and thermal power generation system |
| CN105470990A (en) * | 2016-01-08 | 2016-04-06 | 镇江华东电力设备制造厂有限公司 | System and method for controlling low voltage ride through of high-power direct-driven permanent magnet wind power generation system |
| CN109193766A (en) * | 2018-09-18 | 2019-01-11 | 南京理工大学 | A kind of grid-connected fault traversing control method of MMC-HVDC based on DC energy storage device |
| CN109193766B (en) * | 2018-09-18 | 2021-02-12 | 南京理工大学 | MMC-HVDC grid-connected fault ride-through control method based on direct-current energy storage device |
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| C14 | Grant of patent or utility model | ||
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Address after: 213164 Jiangsu province Changzhou Fenglin Wujin high tech Industrial Development Zone, Road No. 199-1 Patentee after: Jiangsu New United Heavy Industry Technology Co., Ltd. Patentee after: New United Group Co., Ltd. Address before: 213164 Jiangsu city of Changzhou province were Wujin high tech Industrial Development Zone, Road No. 68 Patentee before: Jiangsu New United Heavy Industry Technology Co., Ltd. Patentee before: New United Group Co., Ltd. |
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Granted publication date: 20121226 |