A method and system for adaptively calculating reactive voltage sensitivity at a wind farm grid connection point

Abstract

The present invention relates to the field of voltage control technology, and specifically to a method and system for adaptively calculating reactive voltage sensitivity of a wind farm grid connection point, the method comprising: measuring the reactive voltage sensitivity of the wind farm grid connection point within a typical period, calculating the actual sensitivity by adjusting the voltage and recording the voltage change within the period; calculating the reactive voltage sensitivity setting value under different conditions, and obtaining the reactive voltage sensitivity setting value of the wind farm under different operating modes; real-time monitoring of the reactive voltage sensitivity setting value, and calculating the real-time sensitivity by adaptively measuring reactive disturbances and voltage changes; updating the reactive voltage sensitivity setting value according to the real-time sensitivity, and using the updated reactive voltage sensitivity setting value to adjust the voltage. Through the present invention, the problems of many adjustment times, long adjustment process, and easy voltage oscillation in the traditional method are effectively solved, the accuracy of voltage regulation and the stability of system operation are improved, and the actual needs of wind farm access to the power grid are effectively met.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage control, and in particular to a method and system for adaptively calculating reactive voltage sensitivity at a wind farm grid connection point. Background Art

[0002] At present, the output of wind farms in wind power clusters has a strong correlation. At the same time, the operation mode of wind power clusters connected to the power grid is highly flexible. The changes in the operation mode of the power grid and the fluctuations in the output of wind farms have a significant impact on the voltage reactive sensitivity of the grid connection point. The traditional static reactive voltage sensitivity station automatic voltage control system cannot adapt to this dynamic change, resulting in a large number of adjustments, a long adjustment process, and even oscillation during the adjustment process. These problems make it difficult for the existing automatic voltage control system to meet the reactive voltage regulation requirements of wind farms connected to the power grid, affecting the stability of the power grid and the operating efficiency of wind farms.

[0003] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present disclosure, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art known to those skilled in the art. Summary of the invention

[0004] The present invention provides a method and system for adaptively calculating reactive voltage sensitivity of a wind farm grid connection point, thereby effectively solving the problems pointed out in the background technology.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A method for adaptively calculating reactive voltage sensitivity of a wind farm grid connection point, comprising:

[0007] During a typical period, the reactive voltage sensitivity of the wind farm grid connection point is measured, and the actual sensitivity is calculated by voltage regulation and recording voltage changes during the period. The typical period is the period when the wind farm output and the grid operation are stable;

[0008] According to the operation mode of the wind farm, the reactive voltage sensitivity setting value under different conditions is calculated to obtain the reactive voltage sensitivity setting value of the wind farm under different operation modes;

[0009] Real-time monitoring of the reactive voltage sensitivity setting value, and calculation of the real-time sensitivity by measuring the adaptive reactive disturbance and voltage variation;

[0010] The reactive voltage sensitivity setting value is updated according to the real-time sensitivity, and the updated reactive voltage sensitivity setting value is used to perform voltage regulation.

[0011] Furthermore, during a typical period, the reactive voltage sensitivity of the wind farm grid connection point is measured, and the actual sensitivity is calculated by voltage regulation and recording the voltage change during the period, including:

[0012] The wind farm receives the voltage command from the dispatch center and starts voltage regulation;

[0013] At the beginning of the regulation cycle, the voltage value of the grid connection point is measured, and the required reactive power compensation amount is calculated based on the voltage difference with the command voltage and the preset sensitivity;

[0014] The voltage is regulated according to the calculated reactive power compensation amount, and at the time of the next regulation cycle, the voltage value of the grid connection point is measured again, and the voltage difference between the two measured values ​​is calculated;

[0015] According to the changes of the two voltage measurement values ​​and the reactive compensation amount, the measured reactive voltage sensitivity of the wind farm grid connection point is determined.

[0016] Furthermore, the calculation formula for the required reactive power compensation amount is:

[0017]

[0018] Among them, ΔQ T is the required reactive power compensation, U N is the voltage command value, U T is the current measured grid connection point voltage value, S Y is the preset sensitivity.

[0019] Furthermore, the measured reactive voltage sensitivity calculation formula is:

[0020]

[0021] Among them, S M is the measured reactive voltage sensitivity, ΔU1 is the grid connection point voltage difference between the two measurements, ΔQ T is the required reactive power compensation amount.

[0022] Furthermore, the operation modes of the wind farm include: parallel operation and separate operation.

[0023] Furthermore, the reactive voltage sensitivity setting value is monitored in real time, and the real-time sensitivity is calculated by measuring the adaptive reactive disturbance and voltage variation, including:

[0024] The wind farm agrees with each station on a specific time period, during which the reactive power output of other stations remains unchanged;

[0025] During the specific period, the wind farm adjusts the reactive power output several times and applies a predetermined reactive disturbance to cause a voltage change at the grid connection point;

[0026] After each application of the reactive disturbance, the corresponding voltage variation is measured and recorded, and the real-time reactive voltage sensitivity of the grid connection point is calculated based on several reactive disturbances and the corresponding voltage variation.

[0027] Furthermore, when the voltage variation deviation is greater than the set threshold value in a plurality of consecutive adjustment cycles, the reactive voltage sensitivity setting value is rechecked and updated.

[0028] Furthermore, the method also includes: based on an intelligent algorithm, predicting the change trend of the reactive voltage sensitivity according to historical data and real-time data, and dynamically optimizing the sensitivity parameters.

[0029] A wind farm grid connection point reactive voltage sensitivity adaptive calculation system, the system comprising:

[0030] A sensitivity measurement module measures the reactive voltage sensitivity of the wind farm grid connection point during a typical period, and calculates the actual sensitivity by adjusting the voltage and recording the voltage change during the period. The typical period is the period when the wind farm outputs and the grid operates stably.

[0031] The setting value calculation module calculates the reactive voltage sensitivity setting values ​​under different conditions according to the operation mode of the wind farm, and obtains the reactive voltage sensitivity setting values ​​of the wind farm under different operation modes;

[0032] A real-time monitoring module monitors the reactive voltage sensitivity setting value in real time, and calculates the real-time sensitivity by measuring the adaptive reactive disturbance and voltage variation;

[0033] The set value updating module updates the reactive voltage sensitivity set value according to the real-time sensitivity, and uses the updated reactive voltage sensitivity set value to perform voltage regulation.

[0034] Furthermore, the real-time monitoring module includes:

[0035] The time period agreement unit, the wind farm agrees with each station on a specific time period, during which the reactive power output of other stations remains unchanged;

[0036] A disturbance applying unit, in the specific time period, the wind farm adjusts the reactive power output several times and applies a predetermined reactive disturbance to cause a voltage change at the grid connection point;

[0037] The sensitivity calculation unit measures and records the corresponding voltage variation after applying the reactive disturbance each time, and calculates the real-time reactive voltage sensitivity of the grid connection point according to multiple reactive disturbances and the corresponding voltage variation.

[0038] The technical solution of the present invention can achieve the following technical effects:

[0039] The present invention effectively solves the problems of many adjustment times, long adjustment process and easy voltage oscillation in traditional methods, improves the accuracy of voltage regulation and the stability of system operation, and effectively meets the actual needs of wind farm access to the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 A schematic diagram of a flow chart of a method for adaptively calculating reactive voltage sensitivity at a wind farm grid connection point;

[0042] Figure 2 A schematic diagram of the process of calculating the actual sensitivity by adjusting the voltage and recording the voltage change during the cycle;

[0043] Figure 3 Schematic diagram of the process of calculating real-time sensitivity through adaptive reactive disturbance and voltage variation measurement. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0046] Embodiment 1

[0047] like Figure 1 As shown, the present invention provides a method for adaptively calculating reactive voltage sensitivity at a wind farm grid connection point, the method comprising:

[0048] S1: During the typical period, the reactive voltage sensitivity of the wind farm grid connection point is measured, and the actual sensitivity is calculated by voltage regulation and recording the voltage changes during the cycle. The typical period is the period when the wind farm output and grid operation are stable;

[0049] Specifically, during the typical period when the wind farm output and grid operation are relatively stable, the stable operation period without strong wind and sudden weather changes is first selected as the measurement period. These periods usually have less wind speed fluctuations and load changes, making the measurement results more accurate and reliable. Before the measurement begins, the measurement equipment is calibrated to ensure the accuracy of voltage and reactive power measurement, and the appropriate recording frequency is set according to the operation of the wind farm; during the measurement process, the reactive power output of the wind farm is adjusted to cause the change of the grid connection point voltage, and the voltage value and reactive power change before and after each voltage adjustment are recorded; in each measurement cycle, the voltage value and reactive power output value of the wind farm grid connection point are recorded to ensure that the recorded data includes all changes before and after the voltage adjustment; finally, the actual reactive voltage sensitivity is calculated based on the recorded voltage change and reactive power change.

[0050] S2: According to the operation mode of the wind farm, the reactive voltage sensitivity setting value under different conditions is calculated to obtain the reactive voltage sensitivity setting value of the wind farm under different operation modes;

[0051] Specifically, first identify the current operating mode of the wind farm to ensure that there are corresponding sensitivity setting values ​​under various operating conditions. During the measurement and analysis process, adjust the reactive power output, record the voltage change data, and calculate the reactive voltage sensitivity under various operating conditions; through simulation or actual measurement, analyze the impact of different conditions on the grid connection point voltage, and obtain the corresponding sensitivity setting value. Based on these calculation results, determine the reactive voltage sensitivity setting value suitable for different operating conditions. These setting values ​​are used for real-time monitoring and dynamic adjustment to ensure the voltage stability of the wind farm grid connection point and the reliability of system operation. Through the above steps, the reactive voltage sensitivity setting value of the wind farm under different operating modes can be accurately calculated, providing a basis for real-time monitoring and sensitivity adjustment, and improving the stability and adaptability of wind farm grid connection.

[0052] S3: Real-time monitoring of reactive voltage sensitivity setting value, and calculation of real-time sensitivity through adaptive reactive disturbance and voltage variation measurement;

[0053] Specifically, real-time monitoring of the reactive voltage sensitivity setting value can obtain accurate real-time sensitivity data. By measuring the adaptive reactive disturbance and voltage change, the current reactive voltage sensitivity can be calculated. By dynamically adjusting the reactive voltage sensitivity parameters of the wind farm, the accuracy of voltage regulation and the stability of the system can be ensured. Through real-time monitoring and adjustment, the reactive voltage sensitivity can promptly reflect changes in the operating conditions of the wind farm and the power grid, reduce voltage fluctuations and the number of adjustments, and improve the stability and operating efficiency of the wind farm's grid connection.

[0054] S4: Update the reactive voltage sensitivity setting value according to the real-time sensitivity, and use the updated reactive voltage sensitivity setting value to perform voltage regulation.

[0055] Specifically, first, the calculated real-time sensitivity is compared with the current reactive voltage sensitivity setting value to determine the deviation. If the deviation between the real-time sensitivity and the current setting value exceeds a preset threshold, such as less than 50% or greater than 200% of the current setting value, the reactive voltage sensitivity setting value needs to be updated. When it is determined that the setting value needs to be updated, the current reactive voltage sensitivity setting value is adjusted and updated according to the sensitivity value calculated in real time. This update process can be achieved through an automated control system to ensure fast and accurate adjustment. The updated reactive voltage sensitivity setting value will be used in subsequent voltage regulation processes. With the new setting value, the wind farm can respond to voltage commands more accurately and adjust reactive power, thereby achieving more accurate voltage control. In actual applications, this process is cyclical, i.e., real-time monitoring-calculation of sensitivity-comparison-update of setting value-voltage regulation. The reactive voltage sensitivity setting value is continuously adjusted and optimized to ensure stable operation and efficient regulation of the system.

[0056] As a preferred embodiment of the above, Figure 2 As shown in the figure, during a typical period, the reactive voltage sensitivity of the wind farm grid connection point is measured, and the actual sensitivity is calculated by voltage regulation and recording the voltage changes during the cycle, including:

[0057] A10: The wind farm receives the voltage command from the dispatching center and starts voltage regulation;

[0058] A20: At the beginning of the regulation cycle, measure the voltage value of the grid connection point, and calculate the required reactive power compensation amount based on the voltage difference with the command voltage and the preset sensitivity;

[0059] A30: perform voltage regulation based on the calculated reactive power compensation amount, and measure the voltage value of the grid connection point again at the time of the next regulation cycle, and calculate the voltage difference between the two measured values;

[0060] A40: Determine the measured reactive voltage sensitivity of the wind farm grid connection point based on the changes in the two voltage measurements and the reactive compensation amount.

[0061] Specifically, first, the wind farm receives the voltage command from the dispatch center and starts voltage regulation. The dispatch center issues a voltage command based on the operating status of the power grid. After receiving the command, the wind farm starts the voltage regulation process and adjusts the reactive power output to meet the target voltage value; at the beginning of the regulation cycle, the voltage value of the grid connection point is measured, and the required reactive compensation amount is calculated based on the voltage difference with the command voltage and the preset sensitivity. At the beginning of each regulation cycle, the current voltage value of the wind farm grid connection point is measured in real time, and the required reactive compensation amount is calculated based on the difference between the current voltage value and the command voltage value of the dispatch center, as well as the preset reactive voltage sensitivity parameters; voltage regulation is performed based on the calculated reactive compensation amount, and at the moment of the next regulation cycle, The voltage value of the grid connection point is measured again, and the voltage difference between the two measured values ​​is calculated. The wind farm adjusts the voltage according to the calculated reactive compensation amount and adjusts the reactive power output. At the next adjustment cycle, the voltage value of the grid connection point is measured again, the change in the grid connection point voltage is recorded, and the actual reactive voltage sensitivity is analyzed and calculated. Finally, the measured reactive voltage sensitivity of the wind farm grid connection point is determined based on the change in the two voltage measurement values ​​and the reactive compensation amount. The actual reactive voltage sensitivity of the wind farm grid connection point is determined by comparing the two measured grid connection point voltage differences and the corresponding reactive compensation amounts, reflecting the actual response of the wind farm to voltage regulation under the current operating conditions.

[0062] As a preferred embodiment of the above, the calculation formula of the required reactive power compensation amount is:

[0063]

[0064] Among them, ΔQ T is the required reactive power compensation, U N is the voltage command value, U T is the current measured grid connection point voltage value, S Y is the preset sensitivity.

[0065] Specifically, this formula is used to calculate the reactive power that the wind farm needs to adjust to achieve the target voltage after receiving the voltage command. The voltage command value U N It is the target voltage set by the dispatching center according to the operation status of the power grid. The current measured grid connection point voltage value U T is the actual measured voltage value, the preset sensitivity S Y The reactive power compensation ΔQ calculated by the above formula is the degree of response of the system to voltage changes. T , which can guide the wind farm to make corresponding reactive power adjustments to achieve the voltage regulation target.

[0066] As a preferred embodiment of the above, the calculation formula of the measured reactive voltage sensitivity is:

[0067]

[0068] Among them, S M is the measured reactive voltage sensitivity, ΔU1 is the grid connection point voltage difference between the two measurements, ΔQ T is the required reactive power compensation amount.

[0069] Specifically, this formula is used to calculate the reactive voltage sensitivity of the wind farm during the reactive voltage regulation process. The voltage difference ΔU1 between the two measurements at the grid connection point reflects the change of the voltage before and after the reactive voltage regulation, and the required reactive compensation ΔQ T It is the reactive power adjustment calculated based on the difference between the voltage command value and the current voltage value. The measured reactive voltage sensitivity S calculated by the above formula M , can accurately evaluate the actual response of the wind farm to voltage regulation under the current operating conditions, and provide data support for subsequent sensitivity adjustment and optimization.

[0070] As a preference of the above embodiment, the operation modes of the wind farm include: parallel operation and separate operation.

[0071] Specifically, parallel operation refers to the simultaneous grid-connected operation of multiple wind farms or wind turbines, which jointly transmit electricity to the grid. In this mode of operation, it is necessary to comprehensively consider the mutual influence and synergy between each wind farm or wind turbine, and optimize the overall reactive voltage sensitivity parameters to ensure the stability and operation efficiency of the grid; separate operation refers to the independent operation of each wind farm or wind turbine, which transmits electricity to the grid separately. In this mode of operation, the reactive voltage sensitivity parameters of each wind farm or wind turbine can be adjusted independently, focusing on the voltage regulation effect and response of a single wind farm or wind turbine. By distinguishing between parallel operation and separate operation, it is possible to better adapt to different operating conditions and regulation requirements, improve the accuracy of voltage regulation at the wind farm grid connection point and the stability of the system. Whether in parallel operation or separate operation, real-time monitoring and adjustment of the reactive voltage sensitivity setting value can optimize the voltage regulation process, reduce voltage fluctuations and the number of adjustments, and improve the overall system operation efficiency and reliability.

[0072] 1. When the grid operation mode is parallel operation;

[0073] When running in parallel, wind farms ABC are connected to the same busbar. Since the capacities of wind farms are different, the reactive power compensation amount during each adjustment is also different. Taking wind farm A as an example, the setting value of its reactive power voltage zero sensitivity is S ZA It can be expressed as:

[0074]

[0075] In the formula, S MAis the measured reactive voltage sensitivity of wind farm A, P A is the capacity of wind farm A, P S1 It is the sum of the capacities of all wind farms on the bus where wind farm A is located during parallel operation;

[0076] 2. When the grid operation mode is split operation;

[0077] When the wind farm A is connected to bus 1 and the wind farm BC is connected to bus 2, the influence of the reactive power change of the wind farm on one bus on the voltage of the wind farm grid connection point on the adjacent bus can be expressed by the cross-influence coefficient; for example, the reactive voltage sensitivity of each wind farm on this bus is not much different, set as S, and the cross-reactive voltage sensitivity of the wind farm reactive power on the adjacent bus to the voltage of this bus is set as kS, then the cross-influence coefficient of the adjacent bus on the voltage of this bus is k / (1+k). Taking wind farm B as an example, the setting value of its reactive voltage sensitivity S ZB It can be expressed as:

[0078]

[0079] In the formula, S MB is the measured reactive voltage sensitivity of wind farm B, P B is the capacity of wind farm B, P S2 It is the sum of the capacities of all wind farms on the bus where wind farm B is located during the split operation. In this way, the setting value of reactive voltage sensitivity of each wind farm under different operation modes is obtained, which can be used as the sensitivity parameter of the AVC substation for voltage regulation.

[0080] As a preferred embodiment of the above, Figure 3 As shown, the reactive voltage sensitivity setting value is monitored in real time, and the real-time sensitivity is calculated by measuring the adaptive reactive disturbance and voltage change, including:

[0081] S31: The wind farm agrees with each station on a specific period of time, during which the reactive power output of other stations remains unchanged;

[0082] S32: During a specific period of time, the wind farm adjusts reactive power output several times and applies a predetermined reactive disturbance, causing a voltage change at the grid connection point;

[0083] S33: After each reactive disturbance is applied, the corresponding voltage variation is measured and recorded, and the real-time reactive voltage sensitivity of the grid connection point is calculated based on a number of reactive disturbances and the corresponding voltage variations.

[0084] Specifically, the wind farm negotiates with all relevant stations to determine a specific test period. During this period, in order to ensure the accuracy of the measurement results, the reactive power output of other stations remains unchanged. This period is usually selected when the grid operation is relatively stable to reduce the impact of external interference on the measurement results. During the agreed specific period, the wind farm adjusts the reactive power output and applies multiple predetermined reactive disturbances. These disturbances are achieved through the wind farm's reactive compensation equipment or other adjustment methods. The purpose is to cause changes in the voltage at the grid connection point. The amplitude and frequency of each disturbance are set according to the test requirements to ensure that sufficient data can be obtained for analysis. After each reactive disturbance is applied, the corresponding voltage change is immediately measured and recorded. These data include the voltage value and reactive power change before and after the disturbance. Through multiple measurements, sufficient data samples are collected. Based on these data, the real-time reactive voltage sensitivity of the grid connection point is calculated to reflect the actual response of the wind farm to voltage regulation under the current operating conditions.

[0085] As a preferred embodiment of the above embodiment, when the voltage variation deviation is greater than the set threshold value in a plurality of consecutive adjustment cycles, the reactive voltage sensitivity setting value is rechecked and updated.

[0086] Specifically, due to the large difference in sensitivity between different operating modes and the fact that the operating mode of a complex cluster is not static, it is necessary to monitor the accuracy of the sensitivity setting value in real time to determine whether it needs to be updated. By re-checking and updating the reactive voltage sensitivity setting value when the voltage change deviation is greater than the set threshold in multiple consecutive regulation cycles, it is ensured that the parameters used during regulation are always the latest and accurate, thereby improving the accuracy of voltage regulation. At the same time, this also helps to maintain the stability of the system, prevent voltage regulation out of control or voltage fluctuations due to inaccurate sensitivity parameters, and ensure the stable operation of the power grid and wind farm.

[0087] As a preferred embodiment of the above embodiment, the method further includes: based on an intelligent algorithm, according to historical data and real-time data, predicting the change trend of reactive voltage sensitivity, and dynamically optimizing sensitivity parameters.

[0088] Specifically, first, the historical operation data and real-time data of the wind farm are collected and preprocessed to ensure the integrity and accuracy of the data. Then, a prediction model is established using a machine learning algorithm and trained based on historical data so that it can accurately predict the changing trend of reactive voltage sensitivity. During the operation of the wind farm, the current operation data is input into the prediction model in real time to predict the changing trend of reactive voltage sensitivity, and the sensitivity parameters are dynamically adjusted according to the prediction results. In addition, new operation data is continuously collected, and the prediction model is regularly updated and optimized so that it can continuously improve the prediction accuracy and adaptability as the operating conditions of the wind farm change. In this way, the accuracy of voltage regulation and the stability of the system can be significantly improved, ensuring the efficiency and reliability of the grid-connected operation of the wind farm.

[0089] Embodiment 2

[0090] Based on the same inventive concept as the method for adaptively calculating reactive voltage sensitivity at a wind farm grid connection point in the aforementioned embodiment, the present invention further provides an adaptive calculating system for reactive voltage sensitivity at a wind farm grid connection point, the system comprising:

[0091] The sensitivity measurement module measures the reactive voltage sensitivity of the wind farm grid connection point during a typical period, and calculates the actual sensitivity by adjusting the voltage and recording the voltage changes during the period. The typical period is the period when the wind farm output is stable and the grid operation is stable.

[0092] The setting value calculation module calculates the reactive voltage sensitivity setting values ​​under different conditions according to the operation mode of the wind farm, and obtains the reactive voltage sensitivity setting values ​​of the wind farm under different operation modes;

[0093] Real-time monitoring module, real-time monitoring of reactive voltage sensitivity setting value, through the measurement of adaptive reactive disturbance and voltage change, calculate the real-time sensitivity;

[0094] The setting value updating module updates the reactive voltage sensitivity setting value according to the real-time sensitivity, and uses the updated reactive voltage sensitivity setting value to perform voltage regulation.

[0095] The above-mentioned calculation system in the present invention can effectively implement the adaptive calculation method of reactive voltage sensitivity of the wind farm grid connection point, and the technical effects that can be achieved are as described in the above-mentioned embodiments, which will not be repeated here.

[0096] As a preferred embodiment of the above, the real-time monitoring module includes:

[0097] The time period agreement unit, the wind farm agrees with each station on a specific time period, during which the reactive power output of other stations remains unchanged;

[0098] The disturbance applying unit adjusts the reactive power output of the wind farm several times and applies a predetermined reactive disturbance during a specific period of time, causing a voltage change at the grid connection point;

[0099] The sensitivity calculation unit measures and records the corresponding voltage change after each reactive disturbance is applied, and calculates the real-time reactive voltage sensitivity of the grid connection point based on multiple reactive disturbances and corresponding voltage changes.

[0100] Similarly, the above-mentioned optimization schemes for the system can also respectively achieve the optimization effects corresponding to the method in Example 1, which will not be repeated here.

[0101] Although the present application has been described in conjunction with specific features and embodiments thereof, it is obvious that various modifications and combinations may be made thereto without departing from the spirit and scope of the present application. Accordingly, this specification and the accompanying drawings are merely exemplary illustrations of the present application as defined therein, and are deemed to have covered any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, a person skilled in the art may make various modifications and variations to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the present application and its equivalents, the present application is intended to include these modifications and variations.

Claims

1. A method for adaptively calculating reactive voltage sensitivity of a wind farm grid connection point, characterized in that: include: During a typical period, the reactive voltage sensitivity of the wind farm grid connection point is measured, and the actual sensitivity is calculated by voltage regulation and recording the voltage changes during the period. The typical period is the period when the wind farm output and the grid operation are stable, including: The wind farm receives the voltage command from the dispatch center and starts voltage regulation; At the beginning of the regulation cycle, the voltage value of the grid connection point is measured, and the required reactive power compensation amount is calculated based on the voltage difference with the command voltage and the preset sensitivity; Perform voltage regulation according to the calculated reactive power compensation amount, and measure the voltage value of the grid connection point again at the time of the next regulation cycle, and calculate the voltage difference between the two measured values; Determining the measured reactive voltage sensitivity of the wind farm grid connection point according to the changes of the two voltage measurement values ​​and the reactive compensation amount; According to the operation mode of the wind farm, the reactive voltage sensitivity setting value under different conditions is calculated to obtain the reactive voltage sensitivity setting value of the wind farm under different operation modes; Real-time monitoring of the reactive voltage sensitivity setting value, and calculation of the real-time sensitivity by measuring the adaptive reactive disturbance and voltage variation; The reactive voltage sensitivity setting value is updated according to the real-time sensitivity, and the updated reactive voltage sensitivity setting value is used to perform voltage regulation.

2. The method for adaptively calculating reactive voltage sensitivity of a wind farm grid connection point according to claim 1, characterized in that: The calculation formula for the required reactive power compensation is: ； in, is the required reactive power compensation amount, is the voltage command value, is the currently measured grid connection point voltage value, is the preset sensitivity.

3. The method for adaptively calculating reactive voltage sensitivity of a wind farm grid connection point according to claim 1, characterized in that: The measured reactive voltage sensitivity calculation formula is: ； in, To measure reactive voltage sensitivity, is the grid connection point voltage difference between the two measurements, is the required reactive power compensation amount.

4. The method for adaptively calculating reactive voltage sensitivity of a wind farm grid connection point according to claim 1, characterized in that: The operation modes of the wind farm include: parallel operation and separate operation.

5. The method for adaptively calculating reactive voltage sensitivity of a wind farm grid connection point according to claim 1, characterized in that: The reactive voltage sensitivity setting value is monitored in real time, and the real-time sensitivity is calculated by measuring the adaptive reactive disturbance and voltage variation, including: The wind farm agrees with each station on a specific time period, during which the reactive power output of other stations remains unchanged; During the specific period, the wind farm adjusts the reactive power output several times and applies a predetermined reactive disturbance to cause a voltage change at the grid connection point; After each application of the reactive disturbance, the corresponding voltage variation is measured and recorded, and the real-time reactive voltage sensitivity of the grid connection point is calculated based on several reactive disturbances and the corresponding voltage variation.

6. The method for adaptively calculating reactive voltage sensitivity of a wind farm grid connection point according to claim 1, characterized in that: When the voltage variation deviation is greater than the set threshold value in a plurality of consecutive adjustment cycles, the reactive voltage sensitivity setting value is rechecked and updated.

7. The method for adaptively calculating reactive voltage sensitivity of a wind farm grid connection point according to claim 1, characterized in that: The method further includes: based on an intelligent algorithm, predicting the change trend of the reactive voltage sensitivity according to historical data and real-time data, and dynamically optimizing the sensitivity parameters.

8. A wind farm grid connection point reactive power voltage sensitivity adaptive calculation system, characterized in that: The system comprises: The sensitivity measurement module measures the reactive voltage sensitivity of the wind farm grid connection point during a typical period, and calculates the actual sensitivity by adjusting the voltage and recording the voltage change during the period. The typical period is the period when the wind farm outputs and the grid operates stably. The wind farm receives the voltage command from the dispatching center and starts voltage adjustment, including: At the beginning of the regulation cycle, the voltage value of the grid connection point is measured, and the required reactive power compensation amount is calculated based on the voltage difference with the command voltage and the preset sensitivity; The voltage is regulated according to the calculated reactive power compensation amount, and at the time of the next regulation cycle, the voltage value of the grid connection point is measured again, and the voltage difference between the two measured values ​​is calculated; According to the changes of the two voltage measurements and the reactive compensation amount, the measured reactive voltage sensitivity of the wind farm grid connection point is determined; The setting value calculation module calculates the reactive voltage sensitivity setting values ​​under different conditions according to the operation mode of the wind farm, and obtains the reactive voltage sensitivity setting values ​​of the wind farm under different operation modes; A real-time monitoring module monitors the reactive voltage sensitivity setting value in real time, and calculates the real-time sensitivity by measuring the adaptive reactive disturbance and voltage variation; The set value updating module updates the reactive voltage sensitivity set value according to the real-time sensitivity, and uses the updated reactive voltage sensitivity set value to perform voltage regulation.

9. The wind farm grid connection point reactive power voltage sensitivity adaptive calculation system according to claim 8, characterized in that: The real-time monitoring module comprises: The time period agreement unit, the wind farm agrees with each station on a specific time period, during which the reactive power output of other stations remains unchanged; A disturbance applying unit, in the specific time period, the wind farm adjusts the reactive power output several times and applies a predetermined reactive disturbance to cause a voltage change at the grid connection point; The sensitivity calculation unit measures and records the corresponding voltage variation after applying the reactive disturbance each time, and calculates the real-time reactive voltage sensitivity of the grid connection point according to multiple reactive disturbances and the corresponding voltage variation.

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