阅读说明：本技术 一种适用于风电场功率控制器评估的测试平台及测试方法 (Test platform and test method suitable for wind power plant power controller evaluation ) 是由 张金平 苗风麟 秦世耀 李庆 朱琼锋 贺敬 樊熠 李春彦 解鸿斌 程鹏 居秀丽 于 2019-09-18 设计创作，主要内容包括：本发明提供的测试平台,包括：调度主站功率控制指令模拟单元用于：根据风电场的实际运行工况对风电场功率控制器下发测试指令到被测风电场功率控制器；电网与风电场模拟单元用于：根据被测风电场功率控制器下发的功率控制指令,模拟电网与风电场工作；调度主站功率控制指令模拟单元用于：通过风电场功率控制器采集所述电网与风电场模拟单元输出的电压、电流信号,并基于所述电压、电流信号以及设定的标准数据确定测试结果；被测风电场功率控制器下发的功率控制指令由被测风电场功率控制器基于测试指令制定。有效解决了风电场功率控制器功能的测试、评估不全面的问题,实现根据测试结果及相应标准,为电力系统的安全稳定运行提供可靠保障。(The invention provides a test platform, comprising: the scheduling master station power control instruction simulation unit is used for: sending a test instruction to a tested wind power plant power controller to the wind power plant power controller according to the actual operation condition of the wind power plant; the power grid and wind power plant simulation unit is used for: simulating the work of a power grid and a wind power plant according to a power control instruction issued by a power controller of the tested wind power plant; the scheduling master station power control instruction simulation unit is used for: acquiring voltage and current signals output by the power grid and wind power plant simulation unit through a wind power plant power controller, and determining a test result based on the voltage and current signals and set standard data; and a power control instruction issued by the tested wind power plant power controller is formulated by the tested wind power plant power controller based on the test instruction. The problem that the function of the power controller of the wind power plant is not comprehensively tested and evaluated is effectively solved, and the reliable guarantee is provided for the safe and stable operation of the power system according to the test result and the corresponding standard.)

1. The utility model provides a test platform suitable for wind-powered electricity generation field power controller, its characterized in that, test platform and the wind-powered electricity generation field power controller of being surveyed carry out communication connection, include:

the power control instruction simulation unit of the dispatching master station and the power grid and wind power plant simulation unit;

the scheduling master station power control instruction simulation unit is used for: sending a test instruction to a power controller of the wind power plant to be tested according to the actual operation condition of the wind power plant;

the power grid and wind power plant simulation unit is used for: simulating the work of a power grid and a wind power plant according to a power control instruction issued by the power controller of the tested wind power plant;

the scheduling master station power control instruction simulation unit is further configured to: acquiring voltage and current signals output by the power grid and wind power plant simulation unit through a wind power plant power controller, and determining a test result based on the voltage and current signals and set standard data;

and the power control instruction issued by the tested wind power plant power controller is formulated by the tested wind power plant power controller based on the test instruction.

2. The test platform for the wind farm power controller according to claim 1, wherein the test instructions comprise:

and an active power target instruction, a reactive power target instruction and a voltage target instruction are formulated according to the content of the function test of the wind power plant power controller.

3. The test platform for the wind farm power controller according to claim 2, wherein the content of the wind farm power controller function test comprises:

the active and frequency control function test contents are as follows: a power unlimited mode, a power limited mode and a primary frequency modulation mode;

the reactive voltage control function test contents are as follows: a constant voltage mode, a voltage curve mode, a constant reactive power mode, and a constant power factor mode;

the exception handling function test content is as follows: electrical quantity is abnormal, regulating instruction or step length is out of limit and communication is abnormal.

4. The test platform for the wind farm power controller according to claim 1, wherein the grid and wind farm simulation unit comprises: the system comprises a power grid module, a wind turbine generator module and a reactive power compensation device module, wherein the wind turbine generator module and the reactive power compensation device module are connected with a power grid model through a transformer;

the grid module is used for: simulating an equivalent power grid from a medium voltage level to a high voltage level;

the wind turbine generator module is used for: simulating actual wind turbines in a wind power plant, wherein the number of the wind turbine modules is determined by the actual number of the actual wind turbines in the wind power plant;

the reactive power compensation device module is used for: and performing reactive compensation according to a control strategy based on the voltage and the current acquired in the power grid module.

5. The test platform for the wind farm power controller according to claim 1, wherein the model simulation step length of the grid and wind farm simulation unit is less than 1ms, and the supported protocols include: DL/T634.5101-2002, DL/T634.5104-2002 and MODBUS;

the protocol supported by the scheduling master station power control instruction analog unit comprises the following steps: DL/T634.5101-2002 and DL/T634.5104-2002.

6. The test platform for the power controller of the wind farm according to claim 1, further comprising: a level conversion unit;

the level conversion unit is connected with the power grid, the wind power plant simulation unit and the wind power plant power controller to be tested by hard wiring, and is used for: and amplifying the voltage and current signals collected by the power controller of the wind power plant.

7. The test platform for the power controller of the wind farm according to claim 1, further comprising: a field bus;

and the test platform is in communication connection with the tested wind power plant power controller through a field bus.

8. The test platform for the power controller of the wind farm according to claim 1, wherein the scheduling master station power control command simulation unit comprises:

the power test system comprises a power unlimited mode test subunit, a power limited mode test subunit, a primary frequency modulation mode test subunit, a constant voltage mode test subunit, a voltage curve mode test subunit, a constant reactive power mode test subunit and a constant power factor mode test subunit.

9. The test platform for the wind farm power controller of claim 8, wherein the power unlimited mode test subunit is configured to:

simulating fluctuation of output power of the wind power plant caused by change of wind speed, calculating the 1min and 10min active power change rate of the wind power plant according to the collected three-phase voltage and current data, and judging that the 1min and 10min active power change meets the requirements of GB/T19963;

when the active power of the wind power plant is operated above 90% Pn, simulating the normal shutdown of the wind power plant, calculating the 1min and 10min active power change rates of the wind power plant according to the collected three-phase voltage and current data, and judging that the 1min and 10min active power change meets the requirements of GB/T19963;

and the wind condition of the wind power plant meets the operating condition that the active power is more than 90% Pn, the wind power plant grid connection is started, the 1min and 10min active power change rates of the wind power plant are calculated according to the collected three-phase voltage and current data, and the 1min and 10min active power change is judged to meet the requirement of GB/T19963.

10. The test platform for the wind farm power controller of claim 8, wherein the power limited mode test subunit is configured to:

wind conditions of a wind power plant meet the operating conditions that the active power is more than 90% Pn, the wind speed is kept unchanged, control target instructions are sequentially issued according to the sequence of 80% Pn, 60% Pn, 40% Pn, 20% Pn, 40% Pn, 60% Pn and 80% Pn of the active power, and the active power control response time and the control precision are calculated according to the collected three-phase voltage and current;

the wind condition of the wind power plant meets the operating condition that the active power is more than 90% Pn, the target of the active power is kept unchanged, the active power is changed due to the change of the simulated wind speed, and the control response time and the control precision of the active power are calculated according to the collected three-phase voltage and current.

11. The test platform for the wind farm power controller of claim 8, wherein the chirp mode test subunit is configured to:

the wind power plant actively adopts a power non-limited mode, the frequency of a power grid is simulated to shift under the two conditions that the active power is below 30% Pn and above 90% Pn, and primary frequency modulation response time, primary frequency modulation power increment, primary frequency modulation support time and primary frequency modulation action dead zones are calculated according to the collected three-phase voltage and current;

the wind power plant actively adopts a power limited mode, the frequency of a power grid is simulated to deviate under four output working conditions of 20% Pn, 40% Pn, 60% Pn and 80% Pn of active power, and primary frequency modulation response time, primary frequency modulation power increment, primary frequency modulation supporting time and a primary frequency modulation action dead zone are calculated according to collected three-phase voltage and current.

12. The test platform for the wind farm power controller of claim 8, wherein the constant voltage mode test subunit is configured to:

setting different control target voltage values by taking the grid-connected point voltage of the wind power plant as a control target under two active power outputs of less than 30% Pn and more than 90% Pn, calculating voltage control response time and control precision according to the collected three-phase voltage and current, and recording active power and reactive power of the wind power plant in the voltage adjustment process;

under the two active outputs of the wind power plant, namely below 30% Pn and above 90% Pn, the voltage of a grid-connected point of the wind power plant is kept unchanged, the fluctuation of the voltage of the grid-connected point caused by the fluctuation of the active power of the wind power plant is simulated, the voltage control response time and the control precision are calculated according to the collected three-phase voltage and current, and the active power and the reactive power of the wind power plant in the voltage adjusting process are recorded.

13. The test platform for the wind farm power controller of claim 8, wherein the voltage curve pattern test subunit is configured to:

setting a wind power plant in a voltage curve control mode, simulating the fluctuation of the active power of the wind power plant to cause the voltage fluctuation of a grid-connected point to be out of the range of a voltage control curve under two active powers of below 30% Pn and above 90% Pn, calculating the voltage control response time and the control precision according to the collected three-phase voltage and current, and recording the voltage, the active power and the reactive power of the grid-connected point of the wind power plant in the voltage adjustment process.

14. The test platform for the wind farm power controller of claim 8, wherein the constant reactive power mode test subunit is configured to:

setting a wind power plant in a constant reactive power control mode, adjusting a reactive power control target under two active outputs of less than 30% Pn and more than 90% Pn, and calculating reactive power control response time and control precision according to the collected three-phase voltage and current;

the wind power plant is set to be in a constant reactive power control mode, active power fluctuation of the wind power plant is simulated under two active outputs of less than 30% Pn and more than 90% Pn, and reactive power change conditions of the wind power plant are calculated according to collected three-phase voltage and current.

15. The test platform for the wind farm power controller of claim 8, wherein the constant power factor mode test subunit is configured to:

setting a wind power plant as a constant power factor control mode, simulating the active power fluctuation of the wind power plant under two active outputs of less than 30% Pn and more than 90% Pn, and calculating the change condition of the power factor of the wind power plant according to the collected three-phase voltage and current;

when the electric quantity is abnormal, corresponding active power and reactive power output is locked, and an alarm is given;

when the power regulation instruction or the regulation step length exceeds the limit, the instruction is not executed, and the active power instruction and the reactive power instruction are kept unchanged;

and when the communication is abnormal, the corresponding active power and reactive power output is locked, and an alarm is given.

16. A test method suitable for a wind power plant power controller is characterized by comprising the following steps:

a scheduling main station power control instruction simulation unit issues a test instruction to a tested wind power plant power controller;

the tested wind power plant power controller formulates a power control instruction based on the test instruction and sends the power control instruction to a power grid and wind power plant simulation unit;

the wind power plant simulation unit simulates a power grid and a wind power plant to work based on a power control instruction issued by the wind power plant power controller;

and the dispatching master station power control instruction simulation unit acquires voltage and current signals of the power grid and the wind power plant simulation unit and a set standard number based on the tested wind power plant power controller to determine a test result.

17. The method for testing the power controller of the wind farm according to claim 16, wherein the tested power controller of the wind farm collects the voltage and current signals of the power grid and the wind farm simulation unit as the voltage and current signals amplified by the level conversion unit.

18. The method for testing the power controller of the wind farm according to claim 17, wherein the step of issuing the test instruction to the power controller of the wind farm to be tested by the power control instruction simulation unit of the dispatching master station comprises the following steps:

the scheduling main station power control instruction simulation unit is used for formulating an active power target instruction, a reactive power target instruction and a voltage target instruction according to the content of the function test of the wind power plant power controller;

the wind power plant power controller function test comprises the following contents:

the active and frequency control function test contents are as follows: a power unlimited mode, a power limited mode and a primary frequency modulation mode;

the reactive voltage control function test contents are as follows: a constant voltage mode, a voltage curve mode, a constant reactive power mode, and a constant power factor mode;

the exception handling function test content is as follows: electrical quantity is abnormal, regulating instruction or step length is out of limit and communication is abnormal.

19. A method of testing a power controller for a wind farm according to claim 18, wherein the power unlimited mode comprises:

simulating fluctuation of output power of the wind power plant caused by change of wind speed, calculating the 1min and 10min active power change rate of the wind power plant according to the collected three-phase voltage and current data, and judging that the 1min and 10min active power change meets the requirements of GB/T19963;

when the active power of the wind power plant is operated above 90% Pn, simulating the normal shutdown of the wind power plant, calculating the 1min and 10min active power change rates of the wind power plant according to the collected three-phase voltage and current data, and judging that the 1min and 10min active power change meets the requirements of GB/T19963;

and the wind condition of the wind power plant meets the operating condition that the active power is more than 90% Pn, the wind power plant grid connection is started, the 1min and 10min active power change rates of the wind power plant are calculated according to the collected three-phase voltage and current data, and the 1min and 10min active power change is judged to meet the requirement of GB/T19963.

20. A method of testing a wind farm power controller as claimed in claim 18, wherein the power limited mode comprises:

wind conditions of a wind power plant meet the operating conditions that the active power is more than 90% Pn, the wind speed is kept unchanged, control target instructions are sequentially issued according to the sequence of 80% Pn, 60% Pn, 40% Pn, 20% Pn, 40% Pn, 60% Pn and 80% Pn of the active power, and the active power control response time and the control precision are calculated according to the collected three-phase voltage and current;

the wind condition of the wind power plant meets the operating condition that the active power is more than 90% Pn, the target of the active power is kept unchanged, the active power is changed due to the change of the simulated wind speed, and the control response time and the control precision of the active power are calculated according to the collected three-phase voltage and current.

21. The method of claim 18, wherein the primary frequency modulation mode comprises:

the wind power plant actively adopts a power non-limited mode, the frequency of a power grid is simulated to shift under the two conditions that the active power is below 30% Pn and above 90% Pn, and primary frequency modulation response time, primary frequency modulation power increment, primary frequency modulation support time and primary frequency modulation action dead zones are calculated according to the collected three-phase voltage and current;

the wind power plant actively adopts a power limited mode, the frequency of a power grid is simulated to deviate under four output working conditions of 20% Pn, 40% Pn, 60% Pn and 80% Pn of active power, and primary frequency modulation response time, primary frequency modulation power increment, primary frequency modulation supporting time and a primary frequency modulation action dead zone are calculated according to collected three-phase voltage and current.

22. The method of testing a wind farm power controller of claim 18, wherein the constant voltage mode comprises:

setting different control target voltage values by taking the grid-connected point voltage of the wind power plant as a control target under two active power outputs of less than 30% Pn and more than 90% Pn, calculating voltage control response time and control precision according to the collected three-phase voltage and current, and recording active power and reactive power of the wind power plant in the voltage adjustment process;

under the two active outputs of the wind power plant, namely below 30% Pn and above 90% Pn, the voltage of a grid-connected point of the wind power plant is kept unchanged, the fluctuation of the voltage of the grid-connected point caused by the fluctuation of the active power of the wind power plant is simulated, the voltage control response time and the control precision are calculated according to the collected three-phase voltage and current, and the active power and the reactive power of the wind power plant in the voltage adjusting process are recorded.

23. The method of testing a wind farm power controller of claim 18, wherein the voltage profile mode comprises:

setting a wind power plant in a voltage curve control mode, simulating the fluctuation of the active power of the wind power plant to cause the voltage fluctuation of a grid-connected point to be out of the range of a voltage control curve under two active powers of below 30% Pn and above 90% Pn, calculating the voltage control response time and the control precision according to the collected three-phase voltage and current, and recording the voltage, the active power and the reactive power of the grid-connected point of the wind power plant in the voltage adjustment process.

24. A method of testing a wind farm power controller according to claim 18, wherein the constant reactive power mode comprises:

setting a wind power plant in a constant reactive power control mode, adjusting a reactive power control target under two active outputs of less than 30% Pn and more than 90% Pn, and calculating reactive power control response time and control precision according to the collected three-phase voltage and current;

the wind power plant is set to be in a constant reactive power control mode, active power fluctuation of the wind power plant is simulated under two active outputs of less than 30% Pn and more than 90% Pn, and reactive power change conditions of the wind power plant are calculated according to collected three-phase voltage and current.

25. The method of testing a wind farm power controller of claim 18, wherein the constant power factor mode comprises:

the wind power plant is set to be in a constant power factor control mode, active power fluctuation of the wind power plant is simulated under two active outputs of less than 30% Pn and more than 90% Pn, and the change condition of the power factor of the wind power plant is calculated according to the collected three-phase voltage and current.

26. The method for testing the power controller of the wind farm according to claim 18, wherein when the electrical quantity is abnormal, corresponding active and reactive power outputs are locked and an alarm is given;

when the power regulation instruction or the regulation step length exceeds the limit, the instruction is not executed, and the active power instruction and the reactive power instruction are kept unchanged;

and when the communication is abnormal, the corresponding active power and reactive power output is locked, and an alarm is given.

Technical Field

The invention relates to new energy access and control, in particular to a test platform and a test method suitable for wind power plant power controller evaluation.

Background

The wind power industry develops rapidly, the capacity of a grid-connected wind power plant is increased continuously, the wind power generation amount reaches 4200 hundred million kilowatts in 2020, the wind power generation amount accounts for 6% of the total power generation amount, the influence generated in a power system is not small, and the stable operation of the large-capacity wind power accessed into the power system can bring more and new problems, so that the wind power is required to play a certain supporting role on a power grid. The national standard GB/T19963 technical provisions for accessing to the power system of the wind farm puts forward definite requirements on the active and reactive control capabilities of the wind farm, requires active power regulation capabilities in the aspect of active control, and requires reactive power regulation and voltage control capabilities in the aspect of reactive control. In addition, as the wind power plays a bigger and bigger role in the power system, it is more and more important that the wind power plant meets the increasingly strict grid-connected technical requirements of the power system, but for the evaluation of the power controller of the wind power plant, the current technology cannot complete the comprehensive test of the functions of the wind power plant.

At the power setting layer of the wind power plant, a wind power plant power controller is required to adjust reactive compensation equipment and a wind turbine generator control system according to a scheduling instruction and collected grid connection point signals, so that the control target of a scheduling master station is met. From the control function perspective, the wind farm power controller needs to be capable of performing active and frequency control, reactive voltage control and abnormal condition handling. At present, the power control of a wind power plant is in an immature stage, the performance of controllers of manufacturers is good and uneven, the difference is large, and the potential safety and stability operation hazards of a power system can be reduced by testing and evaluating the controllers before the controllers are put into operation formally.

The published patent CN 108073150 of the invention provides a test system and a test method for a power control strategy of a wind power plant, the system and the corresponding method can receive operation information of the wind power plant in real time, and periodically send power set values of a wind power plant unit and reactive compensation equipment to the corresponding wind power plant unit and reactive compensation equipment in the plant according to different power control strategies, and the performance of an active/reactive control system of the wind power plant can be tested. The power control strategy of the platform is in a module, compared with a real controller, the internal modules such as a data cache module, an analysis module and the like have very different composition structures and characteristics, which have great influence on signal delay and control dynamic characteristics, and in addition, the system cannot deal with and evaluate complex working conditions such as abnormal measurement of electrical quantity, abnormal locking and communication and the like.

The published patent application CN 104793067 provides an evaluation system and an evaluation method for power regulation capability and power quality of a wind farm, which can automatically process test data based on wind power quality on-line monitoring or off-line monitoring data, so as to realize evaluation of power regulation capability and power quality of the wind farm. The patent only concerns the change of active and reactive power of the wind power plant in terms of power regulation capacity, the regulation characteristic of the power controller of the wind power plant contains more contents, and the evaluation of the controller is to judge whether the requirements of relevant standards are met from more angles.

Disclosure of Invention

The technical scheme provided by the invention is as follows:

a test platform suitable for a wind power plant power controller, the test platform is in communication connection with the wind power plant power controller to be tested, and the test platform comprises:

the power control instruction simulation unit of the dispatching master station and the power grid and wind power plant simulation unit;

the scheduling master station power control instruction simulation unit is used for: sending a test instruction to a power controller of the wind power plant to be tested according to the actual operation condition of the wind power plant;

the power grid and wind power plant simulation unit is used for: simulating the work of a power grid and a wind power plant according to a power control instruction issued by the power controller of the tested wind power plant;

the scheduling master station power control instruction simulation unit is further configured to: acquiring voltage and current signals output by the power grid and wind power plant simulation unit through a wind power plant power controller, and determining a test result based on the voltage and current signals and set standard data;

and the power control instruction issued by the tested wind power plant power controller is formulated by the tested wind power plant power controller based on the test instruction.

Preferably, the test instruction includes:

an active power target instruction, a reactive power target instruction and a voltage target instruction are formulated according to the content of the function test of the wind power plant power controller;

preferably, the content of the wind farm power controller function test comprises:

the active and frequency control function test contents are as follows: a power unlimited mode, a power limited mode and a primary frequency modulation mode;

the reactive voltage control function test contents are as follows: a constant voltage mode, a voltage curve mode, a constant reactive power mode, and a constant power factor mode;

the exception handling function test content is as follows: electrical quantity is abnormal, regulating instruction or step length is out of limit and communication is abnormal.

Preferably, the grid and wind farm simulation unit includes: the system comprises a power grid module, a wind turbine generator module and a reactive power compensation device module, wherein the wind turbine generator module and the reactive power compensation device module are connected with a power grid model through a transformer;

the grid module is used for: simulating an equivalent power grid from a medium voltage level to a high voltage level;

the wind turbine generator module is used for: simulating actual wind turbines in a wind power plant, wherein the number of the wind turbine modules is determined by the actual number of the actual wind turbines in the wind power plant;

the reactive power compensation device module is used for: and performing reactive compensation according to a control strategy based on the voltage and the current acquired in the power grid module.

Preferably, the model simulation step length of the power grid and wind farm simulation unit is less than 1ms, and the supported protocols include: DL/T634.5101-2002, DL/T634.5104-2002 and MODBUS;

the protocol supported by the scheduling master station power control instruction analog unit comprises the following steps: DL/T634.5101-2002 and DL/T634.5104-2002.

Preferably, the method further comprises the following steps: a level conversion unit;

the level conversion unit is connected with the power grid, the wind power plant simulation unit and the wind power plant power controller to be tested by hard wiring, and is used for: and amplifying the voltage and current signals collected by the power controller of the wind power plant.

The preferable woolen cloth further comprises: a field bus;

and the test platform is in communication connection with the tested wind power plant power controller through a field bus.

Preferably, the scheduling master station power control instruction simulation unit includes:

the power test system comprises a power unlimited mode test subunit, a power limited mode test subunit, a primary frequency modulation mode test subunit, a constant voltage mode test subunit, a voltage curve mode test subunit, a constant reactive power mode test subunit and a constant power factor mode test subunit.

Preferably, the power unlimited mode testing subunit is configured to:

simulating fluctuation of output power of the wind power plant caused by change of wind speed, calculating the 1min and 10min active power change rate of the wind power plant according to the collected three-phase voltage and current data, and judging that the 1min and 10min active power change meets the requirements of GB/T19963;

when the active power of the wind power plant is operated above 90% Pn, simulating the normal shutdown of the wind power plant, calculating the 1min and 10min active power change rates of the wind power plant according to the collected three-phase voltage and current data, and judging that the 1min and 10min active power change meets the requirements of GB/T19963;

the wind power plant wind condition meets the operation condition that the active power is more than 90% Pn, the wind power plant grid connection is started, the 1min and 10min active power change rates of the wind power plant are calculated according to the collected three-phase voltage and current data, and the 1min and 10min active power change is judged to meet the requirement of GB/T19963;

preferably, the power-limited mode testing subunit is configured to:

wind conditions of a wind power plant meet the operating conditions that the active power is more than 90% Pn, the wind speed is kept unchanged, control target instructions are sequentially issued according to the sequence of 80% Pn, 60% Pn, 40% Pn, 20% Pn, 40% Pn, 60% Pn and 80% Pn of the active power, and the active power control response time and the control precision are calculated according to the collected three-phase voltage and current;

wind conditions of a wind power plant meet the operating condition that the active power is more than 90% Pn, the target of the active power is kept unchanged, the active power is changed due to the change of the simulated wind speed, and the control response time and the control precision of the active power are calculated according to the collected three-phase voltage and current;

preferably, the primary frequency modulation mode testing subunit is configured to:

the wind power plant actively adopts a power non-limited mode, the frequency of a power grid is simulated to shift under the two conditions that the active power is below 30% Pn and above 90% Pn, and primary frequency modulation response time, primary frequency modulation power increment, primary frequency modulation support time and primary frequency modulation action dead zones are calculated according to the collected three-phase voltage and current;

the wind power plant actively adopts a power limited mode, under four output working conditions of 20% Pn, 40% Pn, 60% Pn and 80% Pn of active power, the frequency of a power grid is simulated to deviate, and primary frequency modulation response time, primary frequency modulation power increment, primary frequency modulation support time and a primary frequency modulation action dead zone are calculated according to collected three-phase voltage and current;

preferably, the constant voltage mode test subunit is configured to:

setting different control target voltage values by taking the grid-connected point voltage of the wind power plant as a control target under two active power outputs of less than 30% Pn and more than 90% Pn, calculating voltage control response time and control precision according to the collected three-phase voltage and current, and recording active power and reactive power of the wind power plant in the voltage adjustment process;

keeping the voltage of a grid-connected point of the wind power plant unchanged under two active outputs of less than 30% Pn and more than 90% Pn, simulating the fluctuation of the voltage of the grid-connected point caused by the fluctuation of the active power of the wind power plant, calculating the voltage control response time and the control precision according to the collected three-phase voltage and current, and recording the active power and the reactive power of the wind power plant in the voltage adjustment process;

preferably, the voltage curve pattern testing subunit is configured to:

setting a wind power plant in a voltage curve control mode, simulating the fluctuation of the active power of the wind power plant to cause the voltage fluctuation of a grid-connected point to be out of the range of a voltage control curve under two active outputs of less than 30% Pn and more than 90% Pn, calculating the voltage control response time and the control precision according to the collected three-phase voltage and current, and recording the voltage, the active power and the reactive power of the grid-connected point of the wind power plant in the voltage adjustment process;

preferably, the constant reactive power mode testing subunit is configured to:

setting a wind power plant in a constant reactive power control mode, adjusting a reactive power control target under two active outputs of less than 30% Pn and more than 90% Pn, and calculating reactive power control response time and control precision according to the collected three-phase voltage and current;

setting a wind power plant in a constant reactive power control mode, simulating the active power fluctuation of the wind power plant under two active outputs of less than 30% Pn and more than 90% Pn, and calculating the reactive power change condition of the wind power plant according to the collected three-phase voltage and current;

preferably, the constant power factor mode test subunit is configured to:

setting a wind power plant as a constant power factor control mode, simulating the active power fluctuation of the wind power plant under two active outputs of less than 30% Pn and more than 90% Pn, and calculating the change condition of the power factor of the wind power plant according to the collected three-phase voltage and current;

when the electric quantity is abnormal, corresponding active power and reactive power output is locked, and an alarm is given;

when the power regulation instruction or the regulation step length exceeds the limit, the instruction is not executed, and the active power instruction and the reactive power instruction are kept unchanged;

and when the communication is abnormal, the corresponding active power and reactive power output is locked, and an alarm is given.

A test method suitable for a wind power plant power controller comprises the following steps:

a scheduling main station power control instruction simulation unit issues a test instruction to a tested wind power plant power controller;

the tested wind power plant power controller formulates a power control instruction based on the test instruction and sends the power control instruction to a power grid and wind power plant simulation unit;

the wind power plant simulation unit simulates a power grid and a wind power plant to work based on a power control instruction issued by the wind power plant power controller;

and the dispatching master station power control instruction simulation unit acquires voltage and current signals of the power grid and the wind power plant simulation unit and a set standard number based on the tested wind power plant power controller to determine a test result.

Preferably, the measured wind power plant power controller collects voltage and current signals of a power grid and a wind power plant simulation unit as the voltage and current signals amplified by the level conversion unit.

Preferably, the dispatching master station power control instruction simulation unit issues a test instruction to the tested wind farm power controller, and the method includes:

the scheduling main station power control instruction simulation unit is used for formulating an active power target instruction, a reactive power target instruction and a voltage target instruction according to the content of the function test of the wind power plant power controller;

the wind power plant power controller function test comprises the following contents:

the active and frequency control function test contents are as follows: a power unlimited mode, a power limited mode and a primary frequency modulation mode;

the reactive voltage control function test contents are as follows: a constant voltage mode, a voltage curve mode, a constant reactive power mode, and a constant power factor mode;

the exception handling function test content is as follows: electrical quantity is abnormal, regulating instruction or step length is out of limit and communication is abnormal.

Preferably, the power unlimited mode includes:

simulating fluctuation of output power of the wind power plant caused by change of wind speed, calculating the 1min and 10min active power change rate of the wind power plant according to the collected three-phase voltage and current data, and judging that the 1min and 10min active power change meets the requirements of GB/T19963;

when the active power of the wind power plant is operated above 90% Pn, simulating the normal shutdown of the wind power plant, calculating the 1min and 10min active power change rates of the wind power plant according to the collected three-phase voltage and current data, and judging that the 1min and 10min active power change meets the requirements of GB/T19963;

and the wind condition of the wind power plant meets the operating condition that the active power is more than 90% Pn, the wind power plant grid connection is started, the 1min and 10min active power change rates of the wind power plant are calculated according to the collected three-phase voltage and current data, and the 1min and 10min active power change is judged to meet the requirement of GB/T19963.

Preferably, the power-limited mode includes:

wind conditions of a wind power plant meet the operating conditions that the active power is more than 90% Pn, the wind speed is kept unchanged, control target instructions are sequentially issued according to the sequence of 80% Pn, 60% Pn, 40% Pn, 20% Pn, 40% Pn, 60% Pn and 80% Pn of the active power, and the active power control response time and the control precision are calculated according to the collected three-phase voltage and current;

the wind condition of the wind power plant meets the operating condition that the active power is more than 90% Pn, the target of the active power is kept unchanged, the active power is changed due to the change of the simulated wind speed, and the control response time and the control precision of the active power are calculated according to the collected three-phase voltage and current.

Preferably, the primary frequency modulation mode includes:

the wind power plant actively adopts a power non-limited mode, the frequency of a power grid is simulated to shift under the two conditions that the active power is below 30% Pn and above 90% Pn, and primary frequency modulation response time, primary frequency modulation power increment, primary frequency modulation support time and primary frequency modulation action dead zones are calculated according to the collected three-phase voltage and current;

the wind power plant actively adopts a power limited mode, the frequency of a power grid is simulated to deviate under four output working conditions of 20% Pn, 40% Pn, 60% Pn and 80% Pn of active power, and primary frequency modulation response time, primary frequency modulation power increment, primary frequency modulation supporting time and a primary frequency modulation action dead zone are calculated according to collected three-phase voltage and current.

Preferably, the constant voltage mode includes:

setting different control target voltage values by taking the grid-connected point voltage of the wind power plant as a control target under two active power outputs of less than 30% Pn and more than 90% Pn, calculating voltage control response time and control precision according to the collected three-phase voltage and current, and recording active power and reactive power of the wind power plant in the voltage adjustment process;

under the two active outputs of the wind power plant, namely below 30% Pn and above 90% Pn, the voltage of a grid-connected point of the wind power plant is kept unchanged, the fluctuation of the voltage of the grid-connected point caused by the fluctuation of the active power of the wind power plant is simulated, the voltage control response time and the control precision are calculated according to the collected three-phase voltage and current, and the active power and the reactive power of the wind power plant in the voltage adjusting process are recorded.

Preferably, the voltage curve mode includes:

setting a wind power plant in a voltage curve control mode, simulating the fluctuation of the active power of the wind power plant to cause the voltage fluctuation of a grid-connected point to be out of the range of a voltage control curve under two active powers of below 30% Pn and above 90% Pn, calculating the voltage control response time and the control precision according to the collected three-phase voltage and current, and recording the voltage, the active power and the reactive power of the grid-connected point of the wind power plant in the voltage adjustment process.

Preferably, the constant reactive power mode includes:

setting a wind power plant in a constant reactive power control mode, adjusting a reactive power control target under two active outputs of less than 30% Pn and more than 90% Pn, and calculating reactive power control response time and control precision according to the collected three-phase voltage and current;

the wind power plant is set to be in a constant reactive power control mode, active power fluctuation of the wind power plant is simulated under two active outputs of less than 30% Pn and more than 90% Pn, and reactive power change conditions of the wind power plant are calculated according to collected three-phase voltage and current.

Preferably, the constant power factor mode includes:

the wind power plant is set to be in a constant power factor control mode, active power fluctuation of the wind power plant is simulated under two active outputs of less than 30% Pn and more than 90% Pn, and the change condition of the power factor of the wind power plant is calculated according to the collected three-phase voltage and current.

Preferably, when the electrical quantity is abnormal, the corresponding active power and reactive power output is locked, and an alarm is given;

when the power regulation instruction or the regulation step length exceeds the limit, the instruction is not executed, and the active power instruction and the reactive power instruction are kept unchanged;

and when the communication is abnormal, the corresponding active power and reactive power output is locked, and an alarm is given.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention provides a test platform suitable for a wind power plant power controller, which is in communication connection with a tested wind power plant power controller and comprises: the power control instruction simulation unit of the dispatching master station and the power grid and wind power plant simulation unit; the scheduling master station power control instruction simulation unit is used for: sending a test instruction to a power controller of the wind power plant to be tested according to the actual operation condition of the wind power plant; the power grid and wind power plant simulation unit is used for: simulating the work of a power grid and a wind power plant according to a power control instruction issued by the power controller of the tested wind power plant; the scheduling master station power control instruction simulation unit is further configured to: acquiring voltage and current signals output by the power grid and wind power plant simulation unit through a wind power plant power controller, and determining a test result based on the voltage and current signals and set standard data; and the power control instruction issued by the tested wind power plant power controller is formulated by the tested wind power plant power controller based on the test instruction. The technical scheme provided by the invention effectively solves the problem that the function of the power controller of the wind power plant is not fully tested and evaluated, perfects the performance index of the controller according to the test result and the corresponding standard, and provides reliable guarantee for the safe and stable operation of the power system.

2. The utility model provides a test platform can adapt to different wind-powered electricity generation field power controller and carry out functional test, and the measured object keeps unanimous with test platform's being connected with the scene, and convenient and fast guarantees that the performance design of controller satisfies the standard requirement before putting into operation.

Drawings

FIG. 1 is a schematic structural diagram of a test platform suitable for a wind farm power controller according to the present invention;

FIG. 2 is a schematic diagram of the functional test content of the wind farm power controller of the present invention;

Detailed Description

For a better understanding of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings and examples.