CN102646993A - 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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- CN102646993A CN102646993A CN2012101228533A CN201210122853A CN102646993A CN 102646993 A CN102646993 A CN 102646993A CN 2012101228533 A CN2012101228533 A CN 2012101228533A CN 201210122853 A CN201210122853 A CN 201210122853A CN 102646993 A CN102646993 A CN 102646993A
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000012544 monitoring process Methods 0.000 claims abstract description 6
- 230000001681 protective effect Effects 0.000 claims description 18
- 230000005611 electricity Effects 0.000 claims description 13
- 238000007599 discharging Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 3
- 229920002472 Starch Polymers 0.000 claims description 2
- 235000019698 starch Nutrition 0.000 claims description 2
- 239000008107 starch Substances 0.000 claims description 2
- 241001269238 Data Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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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 wind-powered electricity generation unit low voltage ride through system and method thereof, relate in particular to a kind of wind-powered electricity generation unit low voltage ride through system and method thereof based on the control of active rotating speed.
Background technology
The low-voltage of wind-powered electricity generation unit is passed through the electrical network characteristic that performance directly influences the whole wind electric field, is the important indicator of wind-powered electricity generation online in enormous quantities.It is bigger that the quality that low-voltage is passed through strategy is passed through performance impact to low-voltage, and control effect quality is main considers three aspects: at first, ensure that unit in certain low-voltage amplitude and not off-grid operation in the time, avoids electrical network to occur paralysing; Secondly, unit can provide enough idle supports for wind energy turbine set, helps line voltage to recover normal; At last, unit keeps mechanical property preferably when low-voltage is passed through, and ensures the useful life of mechanical parts such as bearing, pylon.
Summary of the invention
The present invention is intended to invent a kind of wind-powered electricity generation unit low voltage ride through system and method thereof that necessary idle support is provided and reduces the main mechanical part of blower fan is impacted.
A kind of wind-powered electricity generation unit low voltage ride through 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; First output of said load control module and the input of net side control module is connected, load second output of control module is connected with the input that control module is starched in change; The 3rd output of load control module and the input of torque control module are connected; 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 second input of load control module; Wherein, net side data module is used for keeping watch on the net side data, and also will net side data transfers to the load control module, and described net side data comprises voltage on line side, net side active current and net side reactive current; Overvoltage protective module is used to keep watch on DC bus-bar voltage and with transfer of data to DC side data module; The DC side data module realize DC side-discharging through braking chopper and brake resistance and with DC bus-bar voltage, DC side-discharging transfer of data to the control module of loading, the load control module is used for net side data with the DC side data are analyzed and to control signal being transferred to net side control module, becoming and starch control module and torque control module, nets that the side control module is used to provide the output of active power and reactive power and signal transferred to and net the side data module; Become the oar control module and be used to receive control model instruction and the control of realization speed closed loop from the load control module, control model instruction and controlling torque that the torque control module is used to receive from the load control module are exported.
Preferably, described control model instruction comprises normal control model instruction and falls the power control mode instruction.
A kind of wind-powered electricity generation unit low-voltage traversing method comprises following sequential steps:
1, through net side data module monitors voltage on line side, net side active current;
2, pass through formula Q=C * U * (U-U according to the voltage on line side data
T) I
NCalculate net side reactive power, C is idle support constant in the formula, and U is a voltage on line side, U
TBe the point voltage mark constant that is incorporated into the power networks, I
NBe the rated current constant, Q is net side reactive power constant, and will net side data and be sent to the load control module;
3, overvoltage protective module real time monitoring DC bus-bar voltage when voltage is higher than the equipment amplitude, is opened the protection of braking chopper; Be communicated with dc bus and brake resistance loop; When voltage is lower than the equipment amplitude, close the protection of braking chopper, simultaneously; Overvoltage protective module is passed to the load control module with the DC side data in real time, is used for the unit load analysis;
4, voltage on line side, net side active current, net side reactive current, DC bus-bar voltage and off-load data are analyzed and judged whether unit load is bigger than normal: when unit load is bigger than normal; The load control module is assigned and is fallen the power control mode instruction to becoming oar control module and torque control module; Assign simultaneously that the open loop torque is given instructs to the torque control module; After change oar control module receives and falls the power control mode instruction; Become the oar control module and separately rotating speed is controlled, the torque control module is regulated torque according to the given instruction of the open loop torque that receives after receiving and falling the power control mode instruction; When unit load just often, the load control module is assigned the instruction of normal control model to becoming oar control module and torque control module; Change oar control module and torque control module are recovered normally control after receiving normal control model instruction again.
Beneficial effect of the present invention is:
1. voltage on line side, net side active current, net side reactive current, DC bus-bar voltage and off-load data are analyzed; Unit load to low-voltage is passed through under the operating mode is controlled; Issue normal control model instruction or fall the power control mode instruction; When low-voltage was passed through, unit not off-grid moved, and for wind energy turbine set the idle support of necessity is provided;
2. become the slurry control module and receive the control model instruction,, become the oar control module and realize speed closed loop control separately when receiving when falling the power control mode instruction; When receiving the instruction of normal control model, become the oar control module and control with the collaborative rotating speed of realizing of torque control module, the stable generator rotating speed reduces the impact to the main mechanical part of blower fan.
Description of drawings
Fig. 1 passes through control structure figure for low-voltage;
Fig. 2 is load control module structure chart;
Fig. 3 is the 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 wind-powered electricity generation unit low voltage ride through 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; First output of said load control module and the input of net side control module is connected, load second output of control module is connected with the input that control module is starched in change; The 3rd output of load control module and the input of torque control module are connected; 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, and the output of DC side data module is connected with second input of load control module, wherein; Net side data module is used for keeping watch on the net side data, and also will net side data transfers to the load control module; Described net side data comprises voltage on line side, net side active current and net side reactive current, and overvoltage protective module is used to keep watch on DC bus-bar voltage and with transfer of data to DC side data module, the DC side data module through braking chopper and brake resistance realization DC side-discharging and with DC bus-bar voltage, DC side-discharging transfer of data to the control module of loading; The load control module is used for the net side data and the DC side data are analyzed and net the side control module to control signal is transferred to, become slurry control module and torque control module; Net the side control module and be used to provide the output of active power and reactive power and signal is transferred to net side data module, become the oar control module and be used to receive control model instruction and the control of realization speed closed loop from the load control module, control model instruction and controlling torque that the torque control module is used to receive from the load control module are exported.
Described control model instruction comprises normal control model instruction and falls the power control mode instruction.
A kind of wind-powered electricity generation unit low-voltage traversing method is characterized in that: comprise following sequential steps:
1, through net side data module monitors voltage on line side, net side active current;
2, pass through formula Q=C * U * (U-U according to the voltage on line side data
T) I
NCalculate net side reactive power, C is idle support constant in the formula, and U is a voltage on line side, U
TBe the point voltage mark constant that is incorporated into the power networks, I
NBe the rated current constant, Q is net side reactive power constant, and will net side data and be sent to the load control module;
3, overvoltage protective module real time monitoring DC bus-bar voltage when voltage is higher than the equipment amplitude, is opened the protection of braking chopper; Be communicated with dc bus and brake resistance loop; When voltage is lower than the equipment amplitude, close the protection of braking chopper, simultaneously; Overvoltage protective module is passed to the load control module with the DC side data in real time, is used for the unit load analysis;
4, voltage on line side, net side active current, net side reactive current, DC bus-bar voltage and off-load data are analyzed and judged whether unit load is bigger than normal: when unit load is bigger than normal; The load control module is assigned and is fallen the power control mode instruction to becoming oar control module and torque control module; Assign simultaneously that the open loop torque is given instructs to the torque control module; After change oar control module receives and falls the power control mode instruction; Become the oar control module and separately rotating speed is controlled, the torque control module is regulated torque according to the given instruction of the open loop torque that receives after receiving and falling the power control mode instruction; When unit load just often, the load control module is assigned the instruction of normal control model to becoming oar control module and torque control module; Change oar control module and torque control module are recovered normally control after receiving normal control model instruction again.
Embodiment 2
Can be known that by Fig. 1,2,3 when the electric voltage dropping amplitude was big, the output of net side active power was more limited, this moment, energy remaining was amassed in DC side, and the DC bus-bar voltage amplitude rises.Overvoltage protective module real time monitoring DC bus-bar voltage when voltage is higher than certain amplitude, is opened the protection of braking chopper, is communicated with dc bus and brake resistance loop; When voltage is lower than certain amplitude, close the protection of braking chopper.Simultaneously, overvoltage protective module is passed to the load control module with the DC side data in real time, is used for the unit load analysis.
Embodiment 3
Can know that by Fig. 1,2,4 net side control module is kept watch on net side datas such as voltage on line side, net side active current, net side reactive current, and with data passes to the control module of loading.The load control module calculates the reactive power that the unit needs provide according to voltage on line side, and assigns the given instruction of reactive power to netting the side control module.Net side control module is according to instruction output reactive power, simultaneously according to the output of net side device volume controlled active power.
Embodiment 4
Can know by Fig. 1,2,5, after the load control module receives net side data and DC side data, data analyzed and judged whether unit load is bigger than normal.When unit load was bigger than normal, the load control module was assigned and is fallen power control mode instruction to becoming oar control module and torque control module, assigned simultaneously that the open loop torque is given instructs to the torque control module; Change oar control module becomes the oar control module and separately rotating speed is controlled, and do not consider the torque set-point after receiving and falling the power control mode instruction; The torque control module is regulated torque according to the given instruction of the open loop torque that receives, and is not adopted conventional rotating speed control mode to regulate torque after receiving and falling the power control mode instruction.When unit load just often, the load control module is assigned the instruction of normal control model to becoming oar control module and torque control module; Change oar control module and torque control module are recovered normally control after receiving normal control model instruction again.
Claims (3)
1. wind-powered electricity generation unit low voltage ride through 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 slurry control module and torque control module; First output of said load control module and the input of net side control module is connected, load second output of control module is connected with the input that control module is starched in change; The 3rd output of load control module and the input of torque control module are connected; 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 second input of load control module; Wherein, net side data module is used for keeping watch on the net side data, and also will net side data transfers to the load control module, and described net side data comprises voltage on line side, net side active current and net side reactive current; Overvoltage protective module is used to keep watch on DC bus-bar voltage and with transfer of data to DC side data module; The DC side data module realize DC side-discharging through braking chopper and brake resistance and with DC bus-bar voltage, DC side-discharging transfer of data to the control module of loading, the load control module is used for net side data with the DC side data are analyzed and to control signal being transferred to net side control module, becoming and starch control module and torque control module, nets that the side control module is used to provide the output of active power and reactive power and signal transferred to and net the side data module; Become the oar control module and be used to receive control model instruction and the control of realization speed closed loop from the load control module, control model instruction and controlling torque that the torque control module is used to receive from the load control module are exported.
2. wind-powered electricity generation unit low voltage ride through system according to claim 1 is characterized in that: described control model instruction comprises normal control model instruction and falls the power control mode instruction.
3. wind-powered electricity generation unit low-voltage traversing method is characterized in that: comprise following sequential steps:
1, through net side data module monitors voltage on line side, net side active current;
2, pass through formula Q=C * U * (U-U according to the voltage on line side data
T) I
NCalculate net side reactive power, C is idle support constant in the formula, and U is a voltage on line side, U
TBe the point voltage mark constant that is incorporated into the power networks, I
NBe the rated current constant, Q is net side reactive power constant, and will net side data and be sent to the load control module;
3, overvoltage protective module real time monitoring DC bus-bar voltage when voltage is higher than the equipment amplitude, is opened the protection of braking chopper; Be communicated with dc bus and brake resistance loop; When voltage is lower than the equipment amplitude, close the protection of braking chopper, simultaneously; Overvoltage protective module is passed to the load control module with the DC side data in real time, is used for the unit load analysis;
4, voltage on line side, net side active current, net side reactive current, DC bus-bar voltage and off-load data are analyzed and judged whether unit load is bigger than normal: when unit load is bigger than normal; The load control module is assigned and is fallen the power control mode instruction to becoming oar control module and torque control module; Assign simultaneously that the open loop torque is given instructs to the torque control module; After change oar control module receives and falls the power control mode instruction; Become the oar control module and separately rotating speed is controlled, the torque control module is regulated torque according to the given instruction of the open loop torque that receives after receiving and falling the power control mode instruction; When unit load just often, the load control module is assigned the instruction of normal control model to becoming oar control module and torque control module; Change oar control module and torque control module are recovered normally control after receiving normal control model instruction again.
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| 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 true CN102646993A (en) | 2012-08-22 |
| CN102646993B CN102646993B (en) | 2014-07-30 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242346A (en) * | 2014-09-19 | 2014-12-24 | 许继集团有限公司 | Low voltage ride-through control method of wind generation set |
| 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 |
| CN112196732A (en) * | 2020-08-31 | 2021-01-08 | 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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2012
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242346A (en) * | 2014-09-19 | 2014-12-24 | 许继集团有限公司 | Low voltage ride-through control method of wind generation set |
| 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 |
| CN112196732A (en) * | 2020-08-31 | 2021-01-08 | 中国东方电气集团有限公司 | Fan master control pitch and torque instruction processing 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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| CN102646993B (en) | 2014-07-30 |
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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. |
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