CN102646993B - Low-voltage ride through (LVRT) system of wind generation set and method of the system - Google Patents
Low-voltage ride through (LVRT) system of wind generation set and method of the system Download PDFInfo
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- CN102646993B CN102646993B CN201210122853.3A CN201210122853A CN102646993B CN 102646993 B CN102646993 B CN 102646993B CN 201210122853 A CN201210122853 A CN 201210122853A CN 102646993 B CN102646993 B CN 102646993B
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000012544 monitoring process Methods 0.000 claims abstract description 12
- 238000004458 analytical method Methods 0.000 claims abstract description 5
- 230000001681 protective effect Effects 0.000 claims description 18
- 238000007405 data analysis Methods 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 3
- 239000002002 slurry Substances 0.000 description 7
- 230000005611 electricity Effects 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 206010033799 Paralysis Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Classifications
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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
Abstract
An LVRT system of a wind generation set comprises a load control module, a grid-side control module, a grid-side data module, an over-voltage protection module, a DC (direct current)-side data module, a variable pitch control module and a torque control module. An LVRT method of the wind generation set comprises monitoring the grid-side voltage and grid-side active current by the grid-side data module; calculating the grid-side passive power by a formula according to the grid-side voltage data; real-timely monitoring the DC bus voltage for set load analysis by the over-voltage protection module; and analyzing the grid-side voltage, the grid-side active current, the grid-side passive current, the DC bus voltage and unloading data to determine whether the set has large loads, and sending a control mode instruction to the variable pitch control module and the torque control module. The system provided by the invention has the advantage that the wind generation set can work without disconnecting the grid during LVRT so as to provide necessary passive support for the wind farm; and the rotation speed of a power generator is stabilized to reduce the impact to main mechanical parts of a wind turbine.
Description
Technical field
The present invention relates to a kind of LVRT Capability of Wind Turbine Generator system and method thereof, relate in particular to a kind of LVRT Capability of Wind Turbine Generator system and method thereof based on the control of active rotating speed.
Background technology
The low voltage crossing performance of wind-powered electricity generation unit directly affects the electrical network characteristic of whole wind energy turbine set, is the important indicator of wind-powered electricity generation online in enormous quantities.The quality of low voltage crossing strategy is larger to low voltage crossing performance impact, controls three aspects of the main consideration of effect quality: first, guarantee unit, in certain low-voltage amplitude and not off-grid operation in the time, avoids electrical network to occur paralysis; Secondly, unit can provide enough reactive power supports for wind energy turbine set, helps line voltage to recover normal; Finally, unit keeps good mechanical property in the time of low voltage crossing, ensures the useful life of the mechanical parts such as bearing, pylon.
Summary of the invention
The present invention is intended to invent a kind ofly to be provided necessary reactive power support and reduces LVRT Capability of Wind Turbine Generator system and method thereof that the main mechanical part of blower fan is impacted.
A kind of LVRT Capability of Wind Turbine Generator system, comprise load control module, net side control module, net side data module, overvoltage protective module, DC side data module, become slurry control module and torque control module, the first output of said load control module is connected with the input of net side control module, the second output of load control module is connected with the input that becomes slurry control module, the 3rd output of load control module is connected with the input of torque control module, the output of net side control module is connected with the input of net side data module, the output of net side data module is connected with the first input end of load control module, the output of overvoltage protective module is connected with the input of DC side data module, the output of DC side data module is connected with the second input of load control module, wherein, net side data module is used for monitoring net side data and net side data is transferred to load control module, described net side data comprises voltage on line side, net side active current and net side reactive current, overvoltage protective module is used for monitoring DC bus-bar voltage and sends data to DC side data module, DC side data module is by braking chopper and brake resistance realizes DC side-discharging and by DC bus-bar voltage, DC side-discharging transfer of data is to load control module, load control module is for by net side data and DC side data analysis and to control signal being transferred to net side control module, become slurry control module and torque control module, net side control module is for providing the output of active power and reactive power and signal being transferred to net side data module, become oar control module for receiving from the control model instruction of load control module and realizing speed closed loop control, torque control module is for receiving control model instruction the controlling torque output from load control module.
Preferably, described control model instruction comprises normal control model instruction and falls power control mode instruction.
A kind of LVRT Capability of Wind Turbine Generator method, comprises following sequential steps:
1, by net side data module monitors voltage on line side, net side active current;
2, pass through formula Q=C × U × (U-U according to voltage on line side data
t) I
ncalculate net side reactive power, in formula, C is reactive power support constant, and U is voltage on line side, U
tfor grid-connected point voltage mark constant, I
nfor rated current constant, Q is net side reactive power constant, and net side data is sent to load control module;
3, overvoltage protective module real time monitoring DC bus-bar voltage, when voltage is during higher than equipment amplitude, open the protection of braking chopper, be communicated with DC bus and brake resistance loop, when voltage is during lower than equipment amplitude, close the protection of braking chopper, simultaneously, DC side data are passed in real time load control module by overvoltage protective module, for unit load analysis;
4, to voltage on line side, net side active current, net side reactive current, DC bus-bar voltage and off-load data analysis also judge that whether unit load is bigger than normal: in the time that unit load is bigger than normal, load control module is assigned and is fallen power control mode instruction to becoming oar control module and torque control module, assign the given instruction of open loop torque to torque control module simultaneously, change oar control module receives falls after power control mode instruction, becoming oar control module controls rotating speed separately, torque control module receives falls after power control mode instruction, according to the given instruction regulating rotary of the open loop torque square receiving, in the time that unit load is normal, load control module is assigned normal control model instruction to becoming oar control module and torque control module, become oar control module and torque control module and receive again after normal control model instruction, recover normally to control.
Beneficial effect of the present invention is:
1. pair voltage on line side, net side active current, net side reactive current, DC bus-bar voltage and off-load data analysis, unit load under low voltage crossing operating mode is controlled, issue normal control model instruction or fall power control mode instruction, in the time of low voltage crossing, not off-grid operation of unit energy, and provide necessary reactive power support for wind energy turbine set;
2. become slurry control module and receive control model instruction, when receiving while falling power control mode instruction, become oar control module and realize separately speed closed loop control; In the time receiving normal control model instruction, change oar control module and torque control module are collaborative realizes rotating speed control, and stable generator rotating speed, reduces the impact to the main mechanical part of blower fan.
Brief description of the drawings
Fig. 1 is low voltage crossing control structure figure;
Fig. 2 is load control module structure chart;
Fig. 3 is overvoltage protective module structure chart;
Fig. 4 is net side control module structure chart;
Fig. 5 is for becoming oar control module and torque control module structure chart.
Embodiment
Below in conjunction with embodiment and accompanying drawing, structure of the present invention is described further.
Embodiment 1
As shown in Figure 1, a kind of LVRT Capability of Wind Turbine Generator system, comprise load control module, net side control module, net side data module, overvoltage protective module, DC side data module, become slurry control module and torque control module, the first output of said load control module is connected with the input of net side control module, the second output of load control module is connected with the input that becomes slurry control module, the 3rd output of load control module is connected with the input of torque control module, the output of net side control module is connected with the input of net side data module, the output of net side data module is connected with the first input end of load control module, the output of overvoltage protective module is connected with the input of DC side data module, the output of DC side data module is connected with the second input of load control module, wherein, net side data module is used for monitoring net side data and net side data is transferred to load control module, described net side data comprises voltage on line side, net side active current and net side reactive current, overvoltage protective module is used for monitoring DC bus-bar voltage and sends data to DC side data module, DC side data module is by braking chopper and brake resistance realizes DC side-discharging and by DC bus-bar voltage, DC side-discharging transfer of data is to load control module, load control module is for by net side data and DC side data analysis and to control signal being transferred to net side control module, become slurry control module and torque control module, net side control module is for providing the output of active power and reactive power and signal being transferred to net side data module, become oar control module for receiving from the control model instruction of load control module and realizing speed closed loop control, torque control module is for receiving control model instruction the controlling torque output from load control module.
Described control model instruction comprises normal control model instruction and falls power control mode instruction.
A kind of LVRT Capability of Wind Turbine Generator method, is characterized in that: comprise following sequential steps:
1, by net side data module monitors voltage on line side, net side active current;
2, pass through formula Q=C × U × (U-U according to voltage on line side data
t) I
ncalculate net side reactive power, in formula, C is reactive power support constant, and U is voltage on line side, U
tfor grid-connected point voltage mark constant, I
nfor rated current constant, Q is net side reactive power constant, and net side data is sent to load control module;
3, overvoltage protective module real time monitoring DC bus-bar voltage, when voltage is during higher than equipment amplitude, open the protection of braking chopper, be communicated with DC bus and brake resistance loop, when voltage is during lower than equipment amplitude, close the protection of braking chopper, simultaneously, DC side data are passed in real time load control module by overvoltage protective module, for unit load analysis;
4, to voltage on line side, net side active current, net side reactive current, DC bus-bar voltage and off-load data analysis also judge that whether unit load is bigger than normal: in the time that unit load is bigger than normal, load control module is assigned and is fallen power control mode instruction to becoming oar control module and torque control module, assign the given instruction of open loop torque to torque control module simultaneously, change oar control module receives falls after power control mode instruction, becoming oar control module controls rotating speed separately, torque control module receives falls after power control mode instruction, according to the given instruction regulating rotary of the open loop torque square receiving, in the time that unit load is normal, load control module is assigned normal control model instruction to becoming oar control module and torque control module, become oar control module and torque control module and receive again after normal control model instruction, recover normally to control.
Embodiment 2
From Fig. 1,2,3, when voltage falls amplitude when larger, the output of net side active power is more limited, and now remaining energy product is in DC side, and DC bus-bar voltage amplitude rises.Overvoltage protective module real time monitoring DC bus-bar voltage, when voltage is during higher than certain amplitude, opens the protection of braking chopper, is communicated with DC bus and brake resistance loop; When voltage is during lower than certain amplitude, close the protection of braking chopper.Meanwhile, DC side data are passed in real time load control module by overvoltage protective module, for unit load analysis.
Embodiment 3
From Fig. 1,2,4, net side control module monitors the net side datas such as voltage on line side, net side active current, net side reactive current, and data are passed to load control module.Load control module calculates according to voltage on line side the reactive power that unit need to provide, and assigns the given instruction of reactive power to net side control module.Net side control module, according to instruction output reactive power, is exported according to net side device volume controlled active power simultaneously.
Embodiment 4
From Fig. 1,2,5, load control module receives after net side data and DC side data, to data analysis and judge that whether unit load is bigger than normal.In the time that unit load is bigger than normal, load control module is assigned and is fallen power control mode instruction to becoming oar control module and torque control module, assigns the given instruction of open loop torque to torque control module simultaneously; Change oar control module receives falls after power control mode instruction, becomes oar control module and separately rotating speed is controlled, and do not consider torque set-point; Torque control module receives falls after power control mode instruction, according to the given instruction regulating rotary of the open loop torque square receiving, and does not adopt conventional rotating speed control mode to regulate torque.In the time that unit load is normal, load control module is assigned normal control model instruction to becoming oar control module and torque control module; Become oar control module and torque control module and receive again after normal control model instruction, recover normally to control.
Claims (3)
1. a LVRT Capability of Wind Turbine Generator system, it is characterized in that: comprise load control module, net side control module, net side data module, overvoltage protective module, DC side data module, become oar control module and torque control module, the first output of said load control module is connected with the input of net side control module, the second output of load control module is connected with the input that becomes oar control module, the 3rd output of load control module is connected with the input of torque control module, the output of net side control module is connected with the input of net side data module, the output of net side data module is connected with the first input end of load control module, the output of overvoltage protective module is connected with the input of DC side data module, the output of DC side data module is connected with the second input of load control module, wherein, net side data module is used for monitoring net side data and net side data is transferred to load control module, described net side data comprises voltage on line side, net side active current and net side reactive current, overvoltage protective module is used for monitoring DC bus-bar voltage and sends data to DC side data module, DC side data module is by braking chopper and brake resistance realizes DC side-discharging and by DC bus-bar voltage, DC side-discharging transfer of data is to load control module, load control module is used for net side data and DC side data analysis and control signal is transferred to net side control module, become oar control module and torque control module, net side control module is for providing the output of active power and reactive power and signal being transferred to net side data module, become oar control module for receiving from the control model instruction of load control module and realizing speed closed loop control, torque control module is for receiving control model instruction the controlling torque output from load control module.
2. LVRT Capability of Wind Turbine Generator system according to claim 1, is characterized in that: described control model instruction comprises normal control model instruction and falls power control mode instruction.
3. a LVRT Capability of Wind Turbine Generator method, is characterized in that: comprise following sequential steps:
1, by net side data module monitors voltage on line side, net side active current;
2, pass through formula Q=C × U × (U-U according to voltage on line side data
t) I
ncalculate net side reactive power, in formula, C is reactive power support constant, and U is voltage on line side, U
tfor grid-connected point voltage mark constant, I
nfor rated current constant, Q is net side reactive power constant, and net side data is sent to load control module;
3, overvoltage protective module real time monitoring DC bus-bar voltage, when voltage is during higher than equipment amplitude, open the protection of braking chopper, be communicated with DC bus and brake resistance loop, when voltage is during lower than equipment amplitude, close the protection of braking chopper, simultaneously, DC side data are passed in real time load control module by overvoltage protective module, for unit load analysis;
4, to voltage on line side, net side active current, net side reactive current, DC bus-bar voltage and off-load data analysis also judge that whether unit load is bigger than normal: in the time that unit load is bigger than normal, load control module is assigned and is fallen power control mode instruction to becoming oar control module and torque control module, assign the given instruction of open loop torque to torque control module simultaneously, change oar control module receives falls after power control mode instruction, becoming oar control module controls rotating speed separately, torque control module receives falls after power control mode instruction, according to the given instruction regulating rotary of the open loop torque square receiving, in the time that unit load is normal, load control module is assigned normal control model instruction to becoming oar control module and torque control module, become oar control module and torque control module and receive after normal control model instruction, recover normally to control,
Described net side data is voltage on line side, net side active current, net side reactive current, and described DC side data are DC bus-bar voltage, DC side-discharging data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210122853.3A CN102646993B (en) | 2012-04-25 | 2012-04-25 | Low-voltage ride through (LVRT) system of wind generation set and method of the system |
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| CN201210122853.3A CN102646993B (en) | 2012-04-25 | 2012-04-25 | Low-voltage ride through (LVRT) system of wind generation set and method of the system |
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| CN102646993A CN102646993A (en) | 2012-08-22 |
| CN102646993B true CN102646993B (en) | 2014-07-30 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104242346B (en) * | 2014-09-19 | 2017-07-14 | 许继集团有限公司 | A kind of LVRT Capability of Wind Turbine Generator control method |
| CN108631355A (en) * | 2017-12-26 | 2018-10-09 | 北京金风科创风电设备有限公司 | Converter, electric control system and wind farm power transmission system |
| CN112196732B (en) * | 2020-08-31 | 2023-04-07 | 中国东方电气集团有限公司 | Fan master control pitch and torque instruction processing system |
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| US5225712A (en) * | 1991-02-01 | 1993-07-06 | U.S. Windpower, Inc. | Variable speed wind turbine with reduced power fluctuation and a static VAR mode of operation |
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| CN101931241A (en) * | 2010-09-21 | 2010-12-29 | 许继集团有限公司 | Wind farm grid-connected coordination control method |
| CN101964533A (en) * | 2010-09-03 | 2011-02-02 | 国电联合动力技术有限公司 | Low voltage ride-through variable pitch control system for double-fed wind turbine generator unit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7042110B2 (en) * | 2003-05-07 | 2006-05-09 | Clipper Windpower Technology, Inc. | Variable speed distributed drive train wind turbine system |
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2012
- 2012-04-25 CN CN201210122853.3A patent/CN102646993B/en active Active
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| US5225712A (en) * | 1991-02-01 | 1993-07-06 | U.S. Windpower, Inc. | Variable speed wind turbine with reduced power fluctuation and a static VAR mode of operation |
| CN101299540A (en) * | 2007-04-30 | 2008-11-05 | 国网南京自动化研究院 | Apparatus for implementing low voltage cross-over of wind generator set |
| CN101964533A (en) * | 2010-09-03 | 2011-02-02 | 国电联合动力技术有限公司 | Low voltage ride-through variable pitch control system for double-fed wind turbine generator unit |
| CN101931241A (en) * | 2010-09-21 | 2010-12-29 | 许继集团有限公司 | Wind farm grid-connected coordination control method |
Non-Patent Citations (2)
| Title |
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Inventor after: Zhang Rongzhen Inventor after: Yu Yexiang Inventor after: Li Qian Inventor before: Zhang Rongzhen Inventor before: Yu Yexiang Inventor before: Li Qian Inventor before: Hu Gangxin Inventor before: Zhang Yongfeng Inventor before: Wang Xiaoping |
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Free format text: CORRECT: INVENTOR; FROM: ZHANG RONGZHEN YU YEXIANG LI QIAN HU GANGXIN ZHANG YONGFENG WANG XIAOPING TO: ZHANG RONGZHEN YU YEXIANG LI QIAN |
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Effective date of registration: 20160419 Address after: 618000 Sichuan Province, Deyang city Huashan road two No. 2 Patentee after: DONGFANG ELECTRIC WIND POWER CO., LTD. Address before: Linjiang Industrial Park, Xiaoshan District, Hangzhou city 311228 five weft Road No. 2998 in Zhejiang Province Patentee before: Dongfang Electric new energy equipment (Hangzhou) Co., Ltd. |
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Address after: 618000 2 Huashan South Road, Deyang, Sichuan, 2 Patentee after: Dongfang Electric Wind Power Co.,Ltd. Address before: 618000 2 Huashan South Road, Deyang, Sichuan, 2 Patentee before: DONGFANG ELECTRIC WIND POWER Co.,Ltd. |