Reactive compensation method and system based on historical data

Abstract

The invention discloses a reactive compensation method and system based on historical data, the system comprises a data acquisition unit, a data processing unit, a data storage unit and a central control unit, and the data acquisition unit, the data processing unit and the central control unit are respectively in communication connection with the data storage unit. The central control power supply is in communication connection with the data acquisition unit and the data processing unit. According to the method, the fluctuation percentage of the active power of the power grid, the fluctuation percentage of the power factor of the power grid and the fluctuation percentage of the reactive compensation switching amount in the same period and the recent period are calculated by utilizing the historical data of the power grid, so that the trend factors related to reactive compensation are obtained; and the reactive power compensation switching amount is adjusted by using the trend factor during reactive power compensation operation, so that the duration of the reactive power compensation effectiveness can be prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of reactive power compensation. Specifically, it is a reactive power compensation method and system based on historical data. Background Art

[0002] In order to reduce the power consumption of the power grid and improve the power grid quality, people make the power factor of the power grid maintain at a relatively high level through reactive power compensation. The existing reactive power compensation operations are usually based on the current operating state of the power grid, and can adjust the power factor of the power grid in a timely manner. However, this adjustment is usually carried out when the power factor of the power grid has exceeded the preset range. At this time, the switching operation of the reactive power compensation device will have a greater impact on the power grid.

[0003] In order to cope with the expected power factor changes of the power grid, people adopt the method of jointly analyzing historical data and current power grid data to control reactive power compensation operations. However, the existing reactive power compensation control technologies based on historical data and current power grid data usually use historical data to judge the change trend of the operating state of the power grid at the same time period, and then predict the allowed state of the power grid at a certain future moment, but ignore the non-regular fluctuations in the operating conditions of the power grid. This will lead to the need for another switching operation soon after the reactive power compensation device is just put into or cut out. Therefore, how to use the historical data of the power grid to serve the current reactive power compensation switching operation to reduce the ineffective or inefficient switching operations of the reactive power compensation device. Summary of the Invention

[0004] For this reason, the technical problem to be solved by the present invention is to provide a reactive power compensation method and system based on historical data, which calculates the fluctuation percentages of the active power, power factor and reactive power compensation switching amount of the power grid in the same period and the recent period by using the historical data of the power grid, and then obtains the trend factor related to reactive power compensation, and then adjusts the reactive power compensation switching amount by using the trend factor during the reactive power compensation operation to improve the duration of the effectiveness of reactive power compensation.

[0005] To solve the above technical problem, the present invention provides the following technical solutions: A reactive power compensation method based on historical data, comprising the following steps: S100) Data acquisition: Taking the date of time point t0 as the data acquisition base point, collecting the power grid data DATA1 related to the reactive power compensation of the power grid for at least one week before and after the same date of the previous year, and collecting the power grid data DATA2 related to the reactive power compensation of the power grid within a time period of at least three months backward from the date of time point t0; wherein, both the power grid data DATA1 and the power grid data DATA2 include the active power of the power grid, the power factor of the power grid and the reactive power compensation switching amount; S200) Data processing: Calculate the trend factor ζ1 using the percentage fluctuations of the active power, the percentage fluctuations of the power factor, and the percentage fluctuations of the reactive power compensation switching amount in the grid data DATA1, and calculate the trend factor ζ2 using the percentage fluctuations of the active power, the percentage fluctuations of the power factor, and the percentage fluctuations of the reactive power compensation switching amount in the grid data DATA2. Then, calculate the composite trend factor ζ using the following formula 复合 : where m and n are both rational numbers greater than 1, and n - m is greater than or equal to 0.5; S300) Switching operation: When a switching operation is required at time point t0, perform the switching according to the following strategy: Strategy 1) When it is necessary to input a reactive power compensation unit, calculate the reactive power compensation switching amount according to the following formula : where Qc 投 is the reactive power compensation switching amount that should be input, calculated using the grid data at time point t0; Strategy 2) When it is necessary to cut out a reactive power compensation unit, calculate the reactive power compensation switching amount according to the following formula : where Qc 切 is the reactive power compensation switching amount that should be cut out, calculated using the grid data at time point t0.

[0006] In the above reactive power compensation method based on historical data, in step S200), calculate the trend factor ζ1 using the grid data DATA1 and the following formula: where , and are calculated through the following formulas respectively: where α 1-t0 is the absolute average value of the percentage fluctuations of the active power of the grid at the same time point as time point t0 in the grid data DATA1; α 1-h is the absolute average value of the percentage fluctuations of the daily average active power of the grid in the grid data DATA1; β 1-t0 is the absolute average value of the percentage fluctuations of the power factor of the grid at the same time point as time point t0 in the grid data DATA1; β1-h is the absolute average value of the percentage fluctuation of the daily grid power factor in grid data DATA1; γ 1-t0 is the absolute average value of the percentage fluctuation of the reactive power compensation switching amount at the same time point as time point t0 in grid data DATA1; γ 1-h is the absolute average value of the percentage fluctuation of the daily reactive power compensation switching amount in grid data DATA1.

[0007] In the above reactive power compensation method based on historical data, in step S200), the trend factor ζ2 is calculated by using grid data DATA2 and the following formula: In the formula, , and are respectively calculated by the following formulas: In the formula, α 2-t0 is the absolute average value of the percentage fluctuation of the grid active power at the same time point as time point t0 in grid data DATA2; α 2-h is the absolute average value of the percentage fluctuation of the daily average grid active power in grid data DATA2; β 2-t0 is the absolute average value of the percentage fluctuation of the power factor at the same time point as time point t0 in grid data DATA2; β 2-h is the absolute average value of the percentage fluctuation of the daily power factor in grid data DATA2; γ 2-t0 is the absolute average value of the percentage fluctuation of the reactive power compensation switching amount at the same time point as time point t0 in grid data DATA2; γ 2-h is the absolute average value of the percentage fluctuation of the daily reactive power compensation switching amount in grid data DATA2.

[0008] In the above reactive power compensation method based on historical data, in step S200), ζ 复合 is corrected according to the time period in which the reactive power compensation switching operation is located. The specific formula is as follows: In the formula, δ is the correction factor and is calculated by the following formula: In the formula, x, y, and z are preset parameters, where the value range of x is [2.25, 2.45], the value range of y is [3, 3.2], and the value range of z is [2.5, 2.7].

[0009] For the above reactive power compensation method based on historical data, y - x is greater than or equal to 0.6 and less than or equal to 0.9.

[0010] For the above reactive power compensation method based on historical data, y - x is greater than or equal to 0.2 and less than or equal to 0.4.

[0011] For the above reactive power compensation method based on historical data, in step S300), when performing switching operations, when the active powers in grid data DATA1 and grid data DATA2 are both in the rising stage, the calculated reactive power compensation switching amount is adjusted downward by an adjustment range of 0.1 - 0.15, or the calculated reactive power compensation switching amount is adjusted upward by an adjustment range of 0.05 - 0.1; when the active powers in grid data DATA1 and grid data DATA2 are both in the falling stage, the calculated reactive power compensation switching amount is adjusted upward by an adjustment range of 0.05 - 0.15, or the calculated reactive power compensation switching amount is adjusted downward by an adjustment range of 0.05 - 0.1; when the changing trends of the active powers in grid data DATA1 and grid data DATA2 are different, then the reactive power compensation switching amount and the reactive power compensation switching amount are not adjusted.

[0012] A system for reactive power compensation using the above reactive power compensation method based on historical data, comprising: A data acquisition unit for acquiring grid data related to grid reactive power compensation; A data processing unit for processing the data acquired by the data acquisition unit; A data storage unit for storing the data acquired by the data acquisition unit and the data processing results of the data processing unit; A central control unit for controlling the switching of the reactive power compensation unit according to the data processing results of the data processing unit; The data acquisition unit and the data storage unit are respectively communicatively connected to the data storage unit, and the data storage unit is communicatively connected to the control unit.

[0013] The above system further includes an alarm unit for reporting switching operations and notifying the results of switching operations.

[0014] The above system further includes a display unit for displaying the grid operation status and the switching status of the reactive power compensation unit, and the display unit is a hardware terminal or a software terminal.

[0015] The technical solution of the present invention has achieved the following beneficial technical effects: 1. The present invention adjusts the reactive power compensation switching amount by using trend factors related to the active power fluctuation of the power grid, the power factor fluctuation of the power grid, and the reactive power compensation switching amount fluctuation, so as to reduce the switching frequency of reactive power compensation operations caused by the fluctuation of the power grid operation status within a short period of time (usually half an hour) of the power grid, thereby being beneficial to improving the operation stability of the power grid.

[0016] 2. Different degrees of correction are made to the trend factor ζ according to the different power grid loads in different periods within 24 hours, so that the technology of using trend factors to adjust the reactive power compensation switching amount can be better applied to the scenario where the power grid operation status changes significantly with the human work and rest time. 复合 Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the working principle of a reactive power compensation system based on historical data; Figure 2 It is a flowchart of reactive power compensation based on historical data. Detailed Embodiment

[0018] In the power supply field, historical data has good reference significance for monitoring the power grid operation status and can be used for services such as power grid fault detection and power grid operation control. However, due to the relatively rapid increase in power consumption equipment in recent years, when using historical data for reactive power compensation control services, areas with relatively small increases in power consumption compared to the same period are usually selected, and it is difficult to use historical data as a reference for reactive power compensation control in areas with relatively large increases in power consumption compared to the same period. In view of this, the present invention introduces a trend factor to weaken the direct influence of historical data on reactive power compensation control while strengthening the composite influence of historical data on reactive power compensation control.

[0019] Specifically, as Figure 1 shown, the reactive power compensation system based on historical data in the present invention includes a data acquisition unit, a data processing unit, a data storage unit, a central control unit, an alarm unit, and a display unit. The data acquisition unit, the data processing unit, and the central control unit are respectively communicatively connected to the data storage unit, and the central control power supply is communicatively connected to the data acquisition unit, the data processing unit, the alarm unit, and the display unit. Among them, the data acquisition unit is used to collect power grid data related to reactive power compensation of the power grid; the data processing unit is used to process the data collected by the data acquisition unit; the data storage unit is used to store the data collected by the data acquisition unit and the data processing results of the data processing unit; the central control unit is used to control the switching of the reactive power compensation unit according to the data processing results of the data processing unit; the alarm unit is used to report the switching operation and notify the switching operation result; the display unit is used to display the power grid operation status and the switching status of the reactive power compensation unit, and the display unit is a hardware terminal or a software terminal, such as a PC or an APP.

[0020] When applying the reactive power compensation system based on historical data in the present invention to the reactive power compensation control of the power grid, for the power grid areas that have been in operation for more than one year, the historical power grid data of the power grid areas should be input. For the newly built or power grid areas that have been in operation for less than one year, the historical power grid data of the adjacent power grid areas can be used as reference data for input. In view of this, the present invention only takes the existing operating power grid areas as examples for illustration.

[0021] As Figure 2 shown, when performing reactive power compensation by using the reactive power compensation system based on historical data in the present invention, the reactive power compensation operation is realized through the following steps: S100) Data acquisition: Taking the date of time point t0 as the data acquisition base point, acquiring the power grid data DATA1 related to the reactive power compensation of the power grid for at least one week before and after the same date in the previous year, and acquiring the power grid data DATA2 related to the reactive power compensation of the power grid within the time period of at least three months back from the date of time point t0; wherein, both the power grid data DATA1 and the power grid data DATA2 include the active power of the power grid, the power factor of the power grid, and the reactive power compensation switching amount.

[0022] In view of the change in the reference strength and the consideration of the increase in the calculation amount, in the present invention, preferably, the power grid data DATA1 related to the reactive power compensation of the power grid for one week before and after the same date in the previous year is acquired, and the power grid data DATA2 related to the reactive power compensation of the power grid within the time period of three months back from the date of time point t0 is acquired. At this time, there is a strong reference between the power grid data DATA1 and the power grid data DATA2 and the power grid data DATA0 at time point t0, and the calculation amount is not large.

[0023] S200) Data processing: Obtaining the trend factor ζ1 by using the fluctuation percentage of the active power of the power grid, the fluctuation percentage of the power factor of the power grid, and the fluctuation percentage of the reactive power compensation switching amount in the power grid data DATA1, and obtaining the trend factor ζ2 by using the fluctuation percentage of the active power of the power grid, the fluctuation percentage of the power factor of the power grid, and the fluctuation percentage of the reactive power compensation switching amount in the power grid data DATA2, and then calculating the composite trend factor ζ by using the following formula 复合 : In the formula, both m and n are rational numbers greater than 1, and n - m is greater than or equal to 0.5.

[0024] Among them, the trend factor ζ1 can be obtained by using the power grid data DATA1 and the following formula: In the formula, , and They are calculated respectively through the following formulas: In the formula, α 1-t0 is the absolute average value of the percentage fluctuation of the active power of the power grid at the same time point as t0 in the power grid data DATA1; α 1-h is the absolute average value of the percentage fluctuation of the daily average active power of the power grid in the power grid data DATA1; β 1-t0 is the absolute average value of the percentage fluctuation of the power factor of the power grid at the same time point as t0 in the power grid data DATA1; β 1-h is the absolute average value of the percentage fluctuation of the daily power factor of the power grid in the power grid data DATA1; γ 1-t0 is the absolute average value of the percentage fluctuation of the reactive power compensation switching amount at the same time point as t0 in the power grid data DATA1; γ 1-h is the absolute average value of the percentage fluctuation of the daily reactive power compensation switching amount in the power grid data DATA1.

[0025] The trend factor ζ2 can be calculated using the power grid data DATA2 and the following formula: In the formula, , and are calculated respectively through the following formulas: In the formula, α 2-t0 is the absolute average value of the percentage fluctuation of the active power of the power grid at the same time point as t0 in the power grid data DATA2; α 2-h is the absolute average value of the percentage fluctuation of the daily average active power of the power grid in the power grid data DATA2; β 2-t0 is the absolute average value of the percentage fluctuation of the power factor at the same time point as t0 in the power grid data DATA2; β 2-h is the absolute average value of the percentage fluctuation of the daily power factor in the power grid data DATA2; γ 2-t0 is the absolute average value of the percentage fluctuation of the reactive power compensation switching amount at the same time point as t0 in the power grid data DATA2; γ 2-h is the absolute average value of the percentage fluctuation of the daily reactive power compensation switching amount in the power grid data DATA2.

[0026] In the present invention, the absolute average value of the percentage fluctuations of the active power of the power grid, the power factor, and the reactive power compensation switching amount in different reference systems is used as the input for calculating the trend factor ζ1 and the trend factor ζ2. Considering that the start and stop of some electrical equipment in the substation area are not regular, and the transfer in or out of some electrical equipment in the substation area is not regular, this will cause obvious changes in the active power of the power grid, but the power factor and the reactive power compensation switching amount do not necessarily show large fluctuations. Only when large-power equipment starts, stops, transfers in, or transfers out, may the power factor show large fluctuations, and at the same time, it will affect the increase or decrease of the reactive power compensation switching amount. Moreover, regarding the influence of the reactive power compensation switching amount of the reactive power compensation performed at the time point t0, the changes in the power factor and the reactive power compensation switching amount in the historical data have a greater impact. Therefore, when calculating the trend factor ζ1 and the trend factor ζ2, the weights of the changes in the power factor and the reactive power compensation switching amount in the historical data will be increased.

[0027] For the substation area where the active power of the power grid and the power factor change significantly with the change of people's activity time, it is necessary to consider correcting ζ 复合 at different time periods to cope with possible power consumption fluctuations. Specifically, in step S200), ζ 复合 is corrected according to the time period in which the switching operation of the reactive power compensation is located. The specific calculation formula is as follows: In the formula, δ is the correction factor, which is calculated by the following formula: In the formula, x, y, and z are preset parameters, which are set by the user according to the grid operation conditions of the substation area where they are located. Among them, the value range of x is [2.25, 2.45], the value range of y is [3, 3.2], and the value range of z is [2.5, 2.7]. Preferably, y - x is greater than or equal to 0.6 and less than or equal to 0.9, and y - x is greater than or equal to 0.2 and less than or equal to 0.4.

[0028] S300) Switching operation: When a switching operation is required at the time point t0, the switching is performed according to the following strategy: Strategy 1) When it is necessary to input a reactive power compensation unit, the reactive power compensation switching amount is calculated according to the following formula : In the formula, Qc 投 is the reactive power compensation switching amount that should be input calculated using the grid data at the time point t0; Strategy 2) When it is necessary to cut out a reactive power compensation unit, the reactive power compensation switching amount is calculated according to the following formula : In the formula, Qc 切 is the reactive power compensation switching amount that should be cut out, calculated using the grid data at time point t0.

[0029] In step S300), when the trend factor ζ 复合 is corrected, the trend factor ζ used in Strategy 1) and Strategy 2) 复合 should also adopt the corrected trend factor.

[0030] To further ensure that the current switching operation does not burden subsequent switching operations (such as increasing the switching frequency within a short period), the reactive power compensation switching amount in the switching operation should be adjusted to a certain extent according to the trend of the grid active power change in historical data. Specifically: During the switching operation, when the active powers in grid data DATA1 and grid data DATA2 are both in the rising stage, the calculated reactive power compensation switching amount is adjusted downward by an adjustment range of 0.1 - 0.15, preferably 0.12 - 0.14, or the calculated reactive power compensation switching amount is adjusted upward by an adjustment range of 0.05 - 0.1, preferably 0.07 - 0.09; when the active powers in grid data DATA1 and grid data DATA2 are both in the falling stage, the calculated reactive power compensation switching amount is adjusted upward by an adjustment range of 0.05 - 0.15, preferably 0.09 - 0.12, or the calculated reactive power compensation switching amount is adjusted downward by an adjustment range of 0.05 - 0.1, preferably 0.06 - 0.07; when the trend of the active power change in grid data DATA1 is different from that in grid data DATA2, the reactive power compensation switching amount and the reactive power compensation switching amount are not adjusted.

[0031] In the simulation test of reactive power compensation using the reactive power compensation method based on historical data in the present invention, not only does the frequency of the switching operation decrease, especially when the power factor fluctuates multiple times, for the reactive power compensation switching amount Qc 切The correction can endow the on - off operation of primary reactive power compensation with a certain buffering ability for small - amplitude changes in the power factor, that is, it can reduce the change amplitude of the power factor that occurs under the original on - off operation of reactive power compensation. As a result, when there are small - amplitude changes in the power factor, the power factor after the change is still within a reasonable threshold range, thereby extending the interval length between two adjacent on - off operations. For example, when it is necessary to input a reactive power compensation unit, the calculated reactive power compensation on - off amount to be input according to the grid data at time point t0 is 1, and when the active power in both grid data DATA1 and grid data DATA2 is in the rising stage, the is 0.89. At this time, Qc 投 and The difference between them is to cope with the increase in active power within a future time period, so that the grid can have a certain degree of increase in active power within this time period without having to cut out the reactive power compensation unit from the grid power supply system.

[0032] Obviously, the above - mentioned embodiments are merely examples for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the claims of this patent application.

Claims

1. A reactive power compensation method based on historical data, characterized in that, It includes the following steps: S100) Data acquisition: Taking the date of time point t0 as the data acquisition base point, acquiring grid data DATA1 related to grid reactive power compensation for at least one week before and after the same date in the previous year, and acquiring grid data DATA2 related to grid reactive power compensation within a time period of at least three months backward from the date of time point t0; wherein, both the grid data DATA1 and the grid data DATA2 include grid active power, grid power factor, and reactive power compensation switching amount. S200) Data processing: Obtain the trend factor ζ1 by using the percentage fluctuations of the active power of the power grid, the percentage fluctuations of the power factor of the power grid, and the percentage fluctuations of the reactive power compensation switching amount in the power grid data DATA1, and obtain the trend factor ζ2 by using the percentage fluctuations of the active power of the power grid, the percentage fluctuations of the power factor of the power grid, and the percentage fluctuations of the reactive power compensation switching amount in the power grid data DATA2. Then, calculate the composite trend factor ζ using the following formula 复合 : In the formula, both m and n are rational numbers greater than 1, and n - m is greater than or equal to 0.

5. S300) Switching operation: When a switching operation is required at time point t0, perform the switching according to the following strategy: Strategy 1) When reactive power compensation units need to be invested, calculate the reactive power compensation switching amount according to the following formula :[[]]END]] Wherein, Qc 投 is the reactive power compensation switching amount that should be input, calculated using the power grid data at time point t0; Strategy 2) When it is necessary to cut out the reactive power compensation unit, calculate the switching amount of reactive power compensation according to the following formula : Where Qc 切 is the reactive power compensation switching amount that should be cut out, calculated using the grid data at time point t0.

2. The reactive power compensation method based on historical data according to claim 1, wherein In step S200), use the grid data DATA1 and the following formula to calculate the trend factor ζ1: In the formula, , and They are respectively calculated through the following arithmetic expressions: where α 1-t0 is the absolute average value of the percentage fluctuation of the active power of the power grid at the same time point as time point t0 in the power grid data DATA1; α 1-h is the absolute average value of the percentage fluctuation of the daily average active power of the power grid in the power grid data DATA1; β 1-t0 is the absolute average value of the percentage fluctuation of the power factor of the power grid at the same time point as time point t0 in the power grid data DATA1; β 1-h is the absolute average value of the percentage fluctuation of the daily power factor of the power grid in the power grid data DATA1; γ 1-t0 is the absolute average value of the percentage fluctuation of the reactive power compensation switching amount at the same time point as time point t0 in the power grid data DATA1; γ 1-h is the absolute average value of the percentage fluctuation of the daily reactive power compensation switching amount in the power grid data DATA1.

3. The reactive power compensation method based on historical data according to claim 1, wherein In step S200), use the grid data DATA2 and the following formula to calculate the trend factor ζ2: In the formula, , and are respectively calculated through the following formulas: where α 2-t0 is the absolute average value of the percentage fluctuation of the active power of the power grid at the same time point as the time point t0 in the power grid data DATA2; α 2-h is the absolute average value of the percentage fluctuation of the daily average active power of the power grid in the power grid data DATA2; β 2-t0 is the absolute average value of the percentage fluctuation of the power factor at the same time point as the time point t0 in the power grid data DATA2; β 2-h is the absolute average value of the percentage fluctuation of the daily power factor in the power grid data DATA2; γ 2-t0 is the absolute average value of the percentage fluctuation of the reactive power compensation switching amount at the same time point as the time point t0 in the power grid data DATA2; γ 2-h is the absolute average value of the percentage fluctuation of the daily reactive power compensation switching amount in the power grid data DATA2.

4. The reactive power compensation method based on historical data according to claim 1, characterized in that, In step S200), ζ is corrected according to the time period in which the switching operation of reactive power compensation is performed, and the specific calculation formula is as follows: 复合 The specific calculation formula is as follows: In the formula, δ is a correction factor, which is calculated through the following formula: In the formula, x, y, and z are preset parameters, where the value range of x is [2.25, 2.45], the value range of y is [3, 3.2], and the value range of z is [2.5, 2.7].

5. The reactive power compensation method based on historical data according to claim 4, characterized in that, y - x is greater than or equal to 0.6 and less than or equal to 0.

9.

6. The reactive power compensation method based on historical data according to claim 4, characterized in that y - x is greater than or equal to 0.2 and less than or equal to 0.

4.

7. The reactive power compensation method based on historical data according to claim 1, characterized in that In step S300), when performing switching operations, when the active powers in grid data DATA1 and grid data DATA2 are both in the rising stage, the calculated reactive power compensation switching amount is adjusted downward by an adjustment range of 0.1 to 0.15, or the calculated reactive power compensation switching amount is adjusted upward by an adjustment range of 0.05 to 0.1; when the active powers in grid data DATA1 and grid data DATA2 are both in the falling stage, the calculated reactive power compensation switching amount is adjusted upward by an adjustment range of 0.05 to 0.15, or the calculated reactive power compensation switching amount is adjusted downward by an adjustment range of 0.05 to 0.1; when the changing trends of the active powers in grid data DATA1 and grid data DATA2 are different, then the reactive power compensation switching amount and the reactive power compensation switching amount are not adjusted.

8. A system for reactive power compensation using the reactive power compensation method based on historical data described in claim 1, characterized in that, It includes: A data acquisition unit for acquiring grid data related to grid reactive power compensation; A data processing unit for processing the data acquired by the data acquisition unit; A data storage unit for storing the data acquired by the data acquisition unit and the data processing results of the data processing unit; A central control unit for controlling the reactive power compensation unit to perform switching according to the data processing results of the data processing unit; The data acquisition unit and the data storage unit are respectively communicatively connected to the data storage unit, and the data storage unit is communicatively connected to the control unit.

9. The system according to claim 8, characterized in that, It further includes an alarm unit for reporting the switching operation and notifying the result of the switching operation.

10. The system according to claim 8, wherein It further includes a display unit for displaying the grid operation status and the switching status of the reactive power compensation unit.

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