An automatic control method and device for high and low voltage ride through test of a wind turbine generator

Abstract

The application discloses an automatic control method and device for high and low voltage penetration test of a wind turbine, which obtains the state and data of a test unit, test equipment and measuring equipment, sets test conditions, compares the test unit, test equipment and measuring equipment with the test conditions, selects test working conditions and parameter settings to automatically start the test, monitors whether the test unit, test equipment and measuring equipment are normally operated during the test, records the number of test qualified times, selects other working conditions to test when the number of test qualified times reaches a preset qualified number, and avoids inconvenience caused by the poor environment of a wind farm and a photovoltaic power station and the volatility and intermittence of wind energy or illumination, automatically performs high voltage penetration test without manning, greatly accelerates the test progress, and saves a large amount of manpower and material resources.

Description

Technical Field

[0001] This invention relates to the technical field of wind turbine grid connection testing, and in particular to an automatic control method and device for high and low voltage ride-through testing of wind turbine units. Background Technology

[0002] High and low voltage ride-through capability refers to the ability of wind turbines or photovoltaic power generation systems to continue operating and support grid recovery when the grid voltage drops or rises to a certain value. Wind turbines or photovoltaic power generation systems with ride-through capability can reduce the number of times they need to reconnect to the grid during grid faults, thus reducing the impact on the grid.

[0003] In recent years, the large-scale integration of new energy power into the power grid has had an increasingly significant impact on the grid. However, wind farms and photovoltaic power stations are mostly located in harsh environments with inconvenient transportation. Furthermore, the volatility and intermittency of wind or solar energy pose significant challenges to testing. For example, arriving at the testing site when conditions are available, only to find that testing conditions are not met upon arrival, severely impacts the testing schedule and wastes considerable manpower and resources. Currently, there is no method or device that can automatically perform high and low voltage ride-through testing. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing an automatic control method and device for high and low voltage ride-through testing of wind turbine units. This method enables automatic high voltage ride-through testing without human intervention, and automatically calculates and adjusts the range of the testing equipment based on real-time monitored grid voltage to ensure the accuracy of voltage rise or fall amplitude.

[0005] To achieve the above objectives, the technical solution provided by this invention is: an automatic control method for high and low voltage ride-through testing of wind turbine generators, comprising the following steps:

[0006] S1. Acquire the status and data of the test unit, the test equipment, and the measurement equipment;

[0007] S2. Set test conditions and determine whether the current test unit meets the test conditions based on the real-time data of the test unit and the high and low voltage ride-through test standards. If it meets the conditions, select the test conditions. If it does not meet the conditions, return to step S1.

[0008] S3. Based on the selected test conditions, the system impedance of the test equipment, the actual line voltage of the power grid, the rated voltage of the power grid, and the impedance values ​​of each range of the test equipment, calculate and select the voltage drop amplitude or voltage rise amplitude that meets the requirements of high and low voltage ride-through test, and set the test parameters for the test equipment, measuring equipment, and test unit.

[0009] S4. After the parameters are set, the status and data of the test unit, the test equipment, and the measurement equipment are obtained in real time. Check whether the test unit, the test equipment, and the measurement equipment meet the conditions for entering the test. If all conditions are met, proceed to step S5. If any conditions are not met, return to step S3. If any conditions are not met after multiple checks, return to step S2 to reselect the test condition.

[0010] S5. Start testing the test unit, test equipment and measuring equipment, acquire the status and data of the test unit, test equipment and measuring equipment in real time, and monitor the test operation until the test is completed;

[0011] S6. After the test is completed, stop the test on the test unit, test equipment and measuring equipment, record the cooling time and obtain the test results. If the test is qualified, record the number of qualified tests. If the test is unqualified, check whether the test unit is in a fault state. If the test unit is in a fault state, set the test condition to a warning condition and return to step S1. If the test unit is not in a fault state, return directly to step S1.

[0012] S7. Once the cooling time to be recorded reaches the preset required cooling time, repeat steps S4 to S6 to perform the next test. After the number of qualified tests reaches the preset number of qualified tests, return to step S2 and select other working conditions for testing.

[0013] Furthermore, in step S2, test conditions are set, specifically by performing the following operations:

[0014] For high-power output testing (power P > 0.9Pn), the wind speed range is set to V1-V2, and the power P > 0.95Pn is the test condition. For low-power output testing (0.1Pn ≤ P ≤ 0.3Pn), the wind speed range is set to V3-V4, and the power 0.15Pn ≤ P ≤ 0.25Pn is the test condition.

[0015] Furthermore, step S3 includes the following steps:

[0016] S301. Automatically calculate and select the voltage drop or rise amplitude that meets the requirements of high and low voltage ride-through tests, using the following formula:

[0017]

[0018] Among them, U T Z represents the voltage drop amplitude at the test point of the wind turbine unit. sc Z is the breaking impedance of the test equipment. sr Z is the current-limiting impedance of the test equipment. sx To test the system impedance of the model, U nU is the rated voltage of the power grid, and U is the actual line voltage of the wind turbine.

[0019] S302. Set test parameters for the test equipment, measuring equipment, and test unit. Send parameter setting instructions to the test equipment to set the current limiting reactance range, short-circuit reactance range, and test time. At the same time, send parameter setting instructions to the measuring equipment to set the recording time for the test condition.

[0020] Furthermore, in step S4, the following operations are performed:

[0021] Based on the data obtained from the test unit, check whether the test unit meets the test conditions; based on the data obtained from the test equipment, check whether the gear of the test equipment is adjusted in place and whether the parameters of the test condition are set; based on the data obtained from the measuring equipment, check whether the recording time is set; if all checks are satisfied, proceed to step S5; if any unsatisfactory conditions are found, return to step S3; if unsatisfactory conditions are still found after multiple checks, return to step S2 to reselect the test condition.

[0022] Furthermore, in step S5, the following operations are performed:

[0023] The system issues a start test command to the test unit, test equipment, and measuring equipment. The test unit performs high and low voltage ride-through testing according to the high and low voltage ride-through test standard. The test equipment operates according to the high and low voltage ride-through test standard to simulate the state of the power grid. The measuring equipment begins to record the voltage and current during the test. The system acquires the status and data of the test unit, test equipment, and measuring equipment in real time, and monitors whether the power of the test unit meets the test requirements, whether the operation of the test equipment is normal, and whether the measuring equipment records the time normally during the test.

[0024] Furthermore, in step S6, the following operations are performed:

[0025] After the test is completed, a stop test command is issued to the test unit, test equipment, and measuring equipment. The cooling time of the inverter and test equipment is then recorded. If the test is qualified, the number of qualified tests is recorded, i.e., the number of qualified tests is incremented by 1. If the test is unqualified, it is checked whether the test unit is in a fault state. If the test unit is in a fault state, the test condition is set to a warning condition and the process returns to step S1. If the test unit is not in a fault state, the process returns directly to step S1.

[0026] This invention also provides an automatic control device for high and low voltage ride-through testing of wind turbine generators, including a client, a control unit, a first communication module, a second communication module, a third communication module, and a power supply module. The control unit is communicatively connected to the first, second, and third communication modules. The second communication module is communicatively connected to the main control system of the test generator and the low-voltage side measurement equipment. The third communication module is communicatively connected to the control system of the test equipment and the high-voltage side measurement equipment. The client is communicatively connected to the first communication module and can control the test equipment, the test generator, and the measurement equipment through the control unit. The power supply module is electrically connected to the control unit and supplies power to the control unit.

[0027] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0028] This invention can avoid the inconvenience caused by the harsh environment of wind farms and photovoltaic power stations, as well as the fluctuation and intermittency of wind energy or sunlight, to the testing work. It can automatically carry out high voltage ride-through testing without human intervention, which greatly speeds up the testing process and saves a lot of manpower and resources. Attached Figure Description

[0029] Figure 1 This is a flowchart of an automatic control method.

[0030] Figure 2 This is a structural block diagram of an automatic control device. Detailed Implementation

[0031] The present invention will be further described below with reference to specific embodiments.

[0032] Example 1

[0033] See Figure 1 The diagram shows the automatic control method for high and low voltage ride-through testing of wind turbine generators provided in this embodiment, which includes the following steps:

[0034] S1. After initialization, acquire the status and data of the test unit, the test equipment, and the measurement equipment;

[0035] S2. Set test conditions and determine whether the current test unit meets the test conditions based on the real-time data of the test unit and the high and low voltage ride-through test standards. If it meets the conditions, select the test conditions. If it does not meet the conditions, return to step S1.

[0036] To set test conditions, perform the following operations:

[0037] For high-power output testing (power P > 0.9Pn), the wind speed range is set to V1-V2, and the power P > 0.95Pn is the test condition. For low-power output testing (0.1Pn ≤ P ≤ 0.3Pn), the wind speed range is set to V3-V4, and the power 0.15Pn ≤ P ≤ 0.25Pn is the test condition.

[0038] S3. Based on the selected test conditions, the system impedance of the test equipment, the actual line voltage of the power grid, the rated voltage of the power grid, and the impedance values ​​of each range of the test equipment, calculate and select the voltage drop amplitude or voltage rise amplitude that meets the requirements of high and low voltage ride-through testing, and set the test parameters for the test equipment, measuring equipment, and test unit, including the following steps:

[0039] S301. Automatically calculate and select the voltage drop or rise amplitude that meets the requirements of high and low voltage ride-through tests, using the following formula:

[0040]

[0041] Among them, U T Z represents the voltage drop amplitude at the test point of the wind turbine unit. sc Z is the breaking impedance of the test equipment. sr Z is the current-limiting impedance of the test equipment. sx To test the system impedance of the model, U n U is the rated voltage of the power grid, and U is the actual line voltage of the wind turbine.

[0042] S302. Set test parameters for the test equipment, measuring equipment, and test unit. Send parameter setting instructions to the test equipment to set the current limiting reactance range, short-circuit reactance range, and test time. At the same time, send parameter setting instructions to the measuring equipment to set the recording time for the test condition.

[0043] S4. After parameter settings are completed, the status and data of the test unit, test equipment, and measuring equipment are acquired in real time. The test unit, test equipment, and measuring equipment are checked to see if they meet the conditions for entering the test. If all conditions are met, step S5 is executed. If any conditions are not met, the process returns to step S3. If conditions are still not met after multiple checks, the process returns to step S2 to reselect the test condition and performs the following operations:

[0044] Based on the data obtained from the test unit, check whether the test unit meets the test conditions; based on the data obtained from the test equipment, check whether the gear of the test equipment is adjusted in place and whether the parameters of the test condition are set; based on the data obtained from the measuring equipment, check whether the recording time is set; if all checks are satisfied, proceed to step S5; if any unsatisfactory conditions are found, return to step S3; if unsatisfactory conditions are still found after three checks, return to step S2 to reselect the test condition.

[0045] S5. Begin testing the test unit, test equipment, and measuring equipment. Acquire the status and data of the test unit, test equipment, and measuring equipment in real time, and monitor the test operation until completion. Specifically, perform the following operations:

[0046] The system issues a start test command to the test unit, test equipment, and measuring equipment. The test unit performs high and low voltage ride-through testing according to the high and low voltage ride-through test standard. The test equipment operates according to the high and low voltage ride-through test standard to simulate the state of the power grid. The measuring equipment begins to record the voltage and current during the test. The system acquires the status and data of the test unit, test equipment, and measuring equipment in real time, and monitors whether the power of the test unit meets the test requirements, whether the operation of the test equipment is normal, and whether the measuring equipment records the time normally during the test.

[0047] S6. After the test is completed, stop testing the test unit, test equipment, and measuring equipment, record the cooling time, and obtain the test results. If the test is qualified, record the number of qualified tests; if the test is unqualified, check whether the test unit is in a fault state. If the test unit is in a fault state, set the test condition to a warning condition and return to step S1. If the test unit is not in a fault state, directly return to step S1 and perform the following operations:

[0048] After the test is completed, a stop test command is issued to the test unit, test equipment, and measuring equipment. The cooling time of the inverter and test equipment is then recorded. If the test is qualified, the number of qualified tests is recorded, i.e., the number of qualified tests is incremented by 1. If the test is unqualified, it is checked whether the test unit is in a fault state. If the test unit is in a fault state, the test condition is set to a warning condition and the process returns to step S1. If the test unit is not in a fault state, the process returns directly to step S1.

[0049] S7. Once the cooling time to be recorded reaches the preset required cooling time, repeat steps S4 to S6 to perform the next test. After the number of qualified tests reaches the preset number of qualified tests, return to step S2 and select other working conditions for testing.

[0050] Example 2

[0051] See Figure 2As shown in the figure, this embodiment discloses an automatic control device for high and low voltage ride-through testing of wind turbine generators, including a client, a control unit, a first communication module, a second communication module, a third communication module, and a power supply module. The control unit is communicatively connected to the first, second, and third communication modules. The second communication module is communicatively connected to the main control system of the test generator and the low-voltage side measurement equipment. The third communication module is communicatively connected to the control system of the test equipment and the high-voltage side measurement equipment. The client is communicatively connected to the first communication module and can control the test equipment, the test generator, and the measurement equipment through the control unit. The power supply module is electrically connected to the control unit and supplies power to the control unit.

[0052] The control unit communicates with the control system of the test unit through the second communication module, reads the data required for testing in real time, analyzes and processes the data to determine whether the test conditions are met, and also communicates with the low-voltage side measuring equipment to read the data required for testing in real time and determine whether the test conditions are met. The control unit communicates with the control system of the test equipment through the third communication module, reads the data required for testing in real time, issues setting parameters to the test equipment according to the test items, and provides feedback to the control unit after the test equipment completes the execution. It also communicates with the high-voltage side measuring equipment to read the data required for testing in real time and determine whether the test conditions are met. The control unit communicates with the client through the first communication module. The client has the highest priority and can control the test equipment, test unit, and measuring equipment through the control unit.

[0053] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Therefore, any changes made in accordance with the shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. An automatic control method for high and low voltage ride-through testing of wind turbine generators, characterized in that, Includes the following steps: S1. Acquire the status and data of the test unit, the test equipment, and the measurement equipment; S2. Set test conditions and determine whether the current test unit meets the test conditions based on the real-time data of the test unit and the high and low voltage ride-through test standards. If it meets the conditions, select the test conditions. If it does not meet the conditions, return to step S1. S3. Based on the selected test conditions, the system impedance of the test equipment, the actual line voltage of the power grid, the rated voltage of the power grid, and the impedance values ​​of each range of the test equipment, calculate and select the voltage drop amplitude or voltage rise amplitude that meets the requirements of high and low voltage ride-through testing, and set the test parameters for the test equipment, measuring equipment, and test unit, including the following steps: S301. Automatically calculate and select the voltage drop or rise amplitude that meets the requirements of high and low voltage ride-through tests, using the following formula: Among them, U T Z represents the voltage drop amplitude at the test point of the wind turbine unit. sc Z is the breaking impedance of the test equipment. sr Z is the current-limiting impedance of the test equipment. sx To test the system impedance of the model, U n U is the rated voltage of the power grid, and U is the actual line voltage of the wind turbine. S302. Set test parameters for the test equipment, measuring equipment, and test unit. Send parameter setting instructions to the test equipment to set the current limiting reactance range, short-circuit reactance range, and test time. At the same time, send parameter setting instructions to the measuring equipment to set the recording time for the test condition. S4. After the parameters are set, the status and data of the test unit, the test equipment, and the measurement equipment are obtained in real time. Check whether the test unit, the test equipment, and the measurement equipment meet the conditions for entering the test. If all conditions are met, proceed to step S5. If any conditions are not met, return to step S3. If any conditions are not met after multiple checks, return to step S2 to reselect the test condition. S5. Start testing the test unit, test equipment and measuring equipment, acquire the status and data of the test unit, test equipment and measuring equipment in real time, and monitor the test operation until the test is completed; S6. After the test is completed, stop the test on the test unit, test equipment and measuring equipment, record the cooling time and obtain the test results. If the test is qualified, record the number of qualified tests. If the test is unqualified, check whether the test unit is in a fault state. If the test unit is in a fault state, set the test condition to a warning condition and return to step S1. If the test unit is not in a fault state, return directly to step S1. S7. Once the cooling time to be recorded reaches the preset required cooling time, repeat steps S4 to S6 to perform the next test. After the number of qualified tests reaches the preset number of qualified tests, return to step S2 and select other working conditions for testing.

2. The automatic control method for high and low voltage ride-through testing of wind turbine units according to claim 1, characterized in that, In step S2, the test conditions are set, specifically by performing the following operations: For high-power output testing (power P > 0.9Pn), the wind speed range is set to V1-V2, and the power P > 0.95Pn is the test condition. For low-power output testing (0.1Pn ≤ P ≤ 0.3Pn), the wind speed range is set to V3-V4, and the power 0.15Pn ≤ P ≤ 0.25Pn is the test condition.

3. The automatic control method for high and low voltage ride-through testing of wind turbine units according to claim 1, characterized in that, In step S4, the following operations are performed: Based on the data obtained from the test unit, check whether the test unit meets the test conditions; based on the data obtained from the test equipment, check whether the gear of the test equipment is adjusted in place and whether the parameters of the test condition are set; based on the data obtained from the measuring equipment, check whether the recording time is set; if all checks are satisfied, proceed to step S5; if any unsatisfactory conditions are found, return to step S3; if unsatisfactory conditions are still found after multiple checks, return to step S2 to reselect the test condition.

4. The automatic control method for high and low voltage ride-through testing of wind turbine units according to claim 1, characterized in that, In step S5, the following operations are performed: The system issues a start test command to the test unit, test equipment, and measuring equipment. The test unit performs high and low voltage ride-through testing according to the high and low voltage ride-through test standard. The test equipment operates according to the high and low voltage ride-through test standard to simulate the state of the power grid. The measuring equipment begins to record the voltage and current during the test. The system acquires the status and data of the test unit, test equipment, and measuring equipment in real time, and monitors whether the power of the test unit meets the test requirements, whether the operation of the test equipment is normal, and whether the measuring equipment records the time normally during the test.

5. The automatic control method for high and low voltage ride-through testing of wind turbine generators according to claim 1, characterized in that, In step S6, the following operations are performed: After the test is completed, a stop test command is issued to the test unit, test equipment, and measuring equipment. The cooling time of the inverter and test equipment is then recorded. If the test is qualified, the number of qualified tests is recorded, i.e., the number of qualified tests is incremented by 1. If the test is unqualified, it is checked whether the test unit is in a fault state. If the test unit is in a fault state, the test condition is set to a warning condition and the process returns to step S1. If the test unit is not in a fault state, the process returns directly to step S1.

6. An automatic control device for high and low voltage ride-through testing of wind turbine generators, used to implement the automatic control method for high and low voltage ride-through testing of wind turbine generators as described in any one of claims 1-5, characterized in that: The system includes a client, a control unit, a first communication module, a second communication module, a third communication module, and a power supply module. The control unit is communicatively connected to the first, second, and third communication modules. The second communication module is communicatively connected to the main control system of the test unit and the low-voltage side measurement equipment. The third communication module is communicatively connected to the control system of the test equipment and the high-voltage side measurement equipment. The client is communicatively connected to the first communication module and can control the test equipment, the test unit, and the measurement equipment through the control unit. The power supply module is electrically connected to the control unit and supplies power to the control unit.

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