A cyclic switching control method, system, storage medium and device

Abstract

The present invention discloses a cyclic switching control method, system, storage medium and device. Among them, the system includes a data acquisition unit, a data processing unit, a data storage unit and a control 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. By introducing adjustment parameters and adjustable parameters, and correlating the adjustment parameters with the power factor in the same historical period, the power factor at the same time point in the previous statistical period and the power factor at the current time point, the present invention converts the fluctuation of the power factor into a quantifiable parameter, and uses the adjustment parameters to correct the predicted value of the power factor, reducing the prediction error caused by the fluctuation of the power factor and improving the accuracy of the switching operation control of cyclic switching.

Description

Technical Field

[0001] The present invention relates to the technical field of reactive power compensation. Specifically, it is a cyclic switching control method, system, storage medium and device. Background Art

[0002] In order to ensure the power utilization efficiency of the power grid, reduce the energy loss on transformers or transmission lines, thereby improving the power supply efficiency and optimizing the power consumption environment, people usually maintain the power factor of the power grid above a reasonable level. However, since the electrical equipment connected to the power grid does not operate for a long time, the shutdown of the electrical equipment will cause the power factor of the power grid to decrease. Once a large number of electrical equipment shuts down, the power factor of the power grid will drop below the reasonable level, resulting in a decrease in the power utilization efficiency of the power grid, and the energy loss on transformers and transmission lines will also increase accordingly. Therefore, in order to reduce the power grid power consumption and make the power consumption more stable, people improve the power factor of the power grid by means of reactive power compensation for the power grid, thereby eliminating the influence brought by the decrease of the power factor of the power grid. The methods of reactive power compensation include centralized compensation, grouped compensation, local compensation for single motors, etc.

[0003] Cyclic switching is a control strategy for switching reactive power compensation devices, aiming to ensure the balanced operation time of each group of capacitors, thereby prolonging their service life. However, the switching timing of reactive power compensation devices usually depends on whether the power factor exceeds the threshold range, which makes it impossible to supply power to the power grid with the power factor within a certain range all the time, resulting in unstable power quality of the power grid. Therefore, people began to predict the power factor of the power grid based on historical data and use the predicted power factor to pre-regulate the power factor of the power grid. However, in the existing power factor prediction methods of power grids, there is a large deviation between the predicted value and the actual value, because the power factor fluctuations of the power grid cannot be reflected in the prediction process. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to provide a cyclic switching control method, system, storage medium and device. By introducing adjustment parameters and adjustable parameters, and associating the adjustment parameters with the power factor of the same period in history, the power factor at the same time point in the previous statistical period and the power factor at the current time point, the power factor fluctuations are converted into quantifiable parameters, and the adjustment parameters are used to correct the power factor prediction value, reducing the prediction error caused by the power factor fluctuations and improving the accuracy of the switching operation control of cyclic switching.

[0005] To solve the above technical problems, the present invention provides the following technical solutions:

[0006] A cyclic switching control method includes the following steps:

[0007] S1) Data collection: Collect the power factor of the power grid cosφ2 at the current time, the most recent operation time t1 and the most recent cut-off time t2 of the cyclic switching module;

[0008] S2) Data processing: Calculate the most recent operation time of the cyclic switching unit based on the most recent operation time t1 and the most recent cut-off time t2 of the cyclic switching module. and the most recent cut-out duration , and according to the latest operation time The size and the duration of the most recent cut-out The cyclic switching modules are sorted by the size of ; the power factor cosφ3 of the power grid in the time period T after the current time point is predicted based on the power factor cosφ0 of the power grid in the same period of the current time point and the power factor cosφ1 of the power grid at the same time point in the previous statistical cycle. Among them, cosφ3 is calculated by the following formula:

[0009]

[0010] Where, The actual power factor of the power grid at the same time point in the statistical period before the prediction time point; The power factor for reactive power compensation at the predicted time point; To adjust the parameters, the value range is [λ1,λ2], where λ1 and λ2 are calculated by the following formulas:

[0011]

[0012]

[0013] Where, The actual power factor of the power grid at the current time point in the same period of history; The actual power factor of the power grid at the same time point in the statistical period before the prediction time point; is the actual power factor of the power grid at the current time point; x is an adjustable parameter with a value range of (1,2];

[0014] S3) When cosφ3 is greater than the upper threshold, the cycle switching module is switched off and the most recent operation time is The longer cycle switching module is switched out first. When cosφ3 is less than the lower limit of the threshold, the cycle switching module is put into operation and the module is idle and the last switching time is Modules with longer switching cycles are put into operation first.

[0015] In the above-mentioned cyclic switching control method, in step S3), the power factor of the power grid after the cyclic switching module is put into operation is The following inequality should be satisfied:

[0016]

[0017] In the formula, is the grid power factor at the same time point in the previous statistical period before the prediction time point.

[0018] For the above cyclic switching control method, in step S3), the grid power factor after the cyclic switching module cuts out should satisfy the following inequality:

[0019]

[0020] In the formula, is the grid power factor at the same time point in the previous statistical period before the prediction time point.

[0021] For the above cyclic switching control method, in step S2, according to the collected at each acquisition time point in the statistical period where the current time point is located, draw the actual power factor change curve in the statistical period where the current time point is located, and compare the actual power factor change curve in the statistical period where the current time point is located with the actual power factor change curve in the same historical period and output the comparison result;

[0022] In step S3), according to the comparison result of the actual power factor change curve in the statistical period where the current time point is located and the actual power factor change curve in the same historical period obtained in step S2), delay or advance the switching operation of the cyclic switching module. The specific strategy is:

[0023] a) When the actual power factor change curve in the statistical period where the current time point is located moves forward relative to the actual power factor change curve in the same historical period by greater than or equal to 60 s, advance the switching operation of the cyclic switching module according to the preset switching strategy of the cyclic switching module;

[0024] b) When the actual power factor change curve in the statistical period where the current time point is located moves backward relative to the actual power factor change curve in the same historical period by greater than or equal to 60 s, delay the switching operation of the cyclic switching module according to the preset switching strategy of the cyclic switching module;

[0025] c) When the actual power factor change curve in the statistical period where the current time point is located moves forward less than 60 s relative to the actual power factor change curve in the same historical period or the actual power factor change curve in the statistical period where the current time point is located moves backward less than 60 s relative to the actual power factor change curve in the same historical period, perform the switching operation normally according to the preset switching strategy of the cyclic switching module.

[0026] For the above cyclic switching control method, in strategy a), when advancing the switching of the cyclic switching module, calculate the advance duration through the following formula :

[0027]

[0028] In the formula, is the time duration of the forward shift of the actual power factor change curve in the statistical period at the current time point relative to the actual power factor change curve in the same historical period; both m and n are natural numbers, and n ≥ 2m.

[0029] For the above cyclic switching control method, in strategy b), when delaying the switching of the cyclic switching module, the delay duration is calculated by the following formula :

[0030]

[0031] In the formula, is the time duration of the forward shift of the actual power factor change curve in the statistical period at the current time point relative to the actual power factor change curve in the same historical period; α is a regulation parameter, and its value range is [1, 4].

[0032] For the above cyclic switching control method, the value range of α is [1.5, 2].

[0033] A system for performing cyclic switching control by using the above cyclic switching control method, comprising:

[0034] A data acquisition unit, configured to collect the grid power factor cosφ2 at the current time point, the most recent operation time point t1 and the most recent cut-off time point t2 of the cyclic switching module in real time;

[0035] A data processing unit, configured to process the data collected by the data acquisition unit;

[0036] A data storage unit, configured to store the data collected by the data acquisition unit and the data processing results of the data processing unit;

[0037] A control unit, configured to control the switching operation of the cyclic switching unit according to the data processing results of the data processing unit;

[0038] 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.

[0039] A computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the above cyclic switching control method is implemented.

[0040] A computer device, comprising a readable storage medium, a processor, and a computer program stored on the readable storage medium and executable on the processor, and when the computer program is executed by the processor, the above cyclic switching control method is implemented.

[0041] The technical solution of the present invention has achieved the following beneficial technical effects:

[0042] 1. The present invention introduces adjustment parameters and correlates the adjustment parameters with the power factor at the current time point, the power factor of the same historical period at the current time point, and the power factor of the same time point in the previous statistical period at the current time point. At the same time, quantification is carried out, and the fluctuations of the power factor are observed and integrated from the directions of the historical period and the adjacent period, ensuring that the fluctuations of the power factor can be considered from the perspectives of periodicity and development, so as to be more accurate in predicting the changes of the power factor, ensuring the precise control of the switching operation of the cyclic switching module, and avoiding the adjusted power factor being lower or exceeding the threshold range due to the switching operation of the cyclic switching module.

[0043] 2. In view of the fact that the forward or backward shift of the power factor change curve will affect the prediction of the power factor, and further affect the switching operation of the cyclic switching module, the present invention also proposes a method to solve the problems brought by the forward or backward shift of the power factor change curve, avoiding the power factor prediction error caused by the advance or lag of the power factor change, and improving the accuracy of the switching timing of the cyclic switching module. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 is a schematic diagram of the working principle of the cyclic switching control system;

[0045] Figure 2 is a flowchart of the cyclic switching control method;

[0046] Figure 3 is a schematic diagram of the computer device principle capable of performing cyclic switching control. DETAILED DESCRIPTION OF THE INVENTION

[0047] To ensure the stability of the power quality of the power grid, people usually keep the power factor of the power grid within a preset threshold range. When the power factor of the power grid is lower than the lower limit of the preset threshold range, a reactive power compensation device is put into operation to improve the power factor of the power grid. When the power factor of the power grid is higher than the upper limit of the preset threshold range, the operating reactive power compensation device is removed from the power grid. However, the real-time monitoring of the power factor of the power grid has a certain lag with respect to the change of the power factor of the power grid, resulting in a certain lag in the switching operation of the reactive power compensation device, which will affect the power supply stability of the power grid. Therefore, the present invention provides a cyclic switching control system to ensure that the power grid can supply power when the power factor of the power grid is kept within the preset threshold range.

[0048] Such as Figure 1As shown, the cyclic switching control system in the present invention includes a data acquisition unit, a data processing unit, a data storage unit and a control unit. The data acquisition unit and the data storage unit are respectively communicated with the data storage unit, and the data storage unit is communicated with the control unit.

[0049] Among them, the data acquisition unit is used to collect in real time the power factor cosφ2 of the power grid at the current time point, the most recent operation time point t1 and the most recent cut-out time point t2 of the cycle switching module, and can also be used to collect the working status parameters of the capacitor in the cycle switching module, such as voltage, temperature, etc. Specifically, different sensors, instruments, etc. can be set as needed to carry out data acquisition; the data processing unit is used to process the relevant data collected by the data acquisition unit according to needs to meet the requirements of the control unit to operate according to the processing results; 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 control unit is used to control the switching operation of the cycle switching unit according to the data processing results of the data processing unit.

[0050] In terms of controlling the power factor of the power grid, the power factor of the power grid must be controlled within the preset threshold range so that the power factor of the power grid will not be lower than the lower limit required by the industry, nor higher than 1, in order to ensure the quality of the power supply of the power grid. This requires that reactive power compensation devices be put into the power grid before the power factor of the power grid decreases and decreases to below the lower limit required by the industry, and that the reactive power compensation devices put into operation in the power grid be removed before the power factor of the power grid increases to 1. Based on this requirement, if Figure 2 As shown, the cyclic switching control system of the present invention is used to implement the switching control of the cyclic switching module through the following steps:

[0051] S1) Data collection: Collect the grid power factor cosφ2 at the current time, the most recent commissioning time t1 and the most recent cut-off time t2 of the cyclic switching module;

[0052] S2) Data processing: Calculate the most recent operation time of the cyclic switching unit based on the most recent operation time t1 and the most recent cut-off time t2 of the cyclic switching module. and the most recent cut-out duration , and according to the latest operation time The size and the duration of the most recent cut-out The cyclic switching modules are sorted by the size of ; the power factor cosφ3 of the power grid in the time period T after the current time point is predicted based on the power factor cosφ0 of the power grid in the same period of the current time point and the power factor cosφ1 of the power grid at the same time point in the previous statistical cycle. Among them, cosφ3 is calculated by the following formula:

[0053]

[0054] In the formula, is the actual power factor of the power grid at the same time point in the previous statistical cycle before the prediction time point; is the reactive power compensation power factor at the prediction time point; is an adjustment parameter, and its value range is [λ1, λ2]. Among them, λ1 and λ2 are calculated through the following formulas respectively:

[0055]

[0056]

[0057] In the formula, is the actual power factor of the power grid in the historical same period at the current time point; is the actual power factor of the power grid at the same time point in the previous statistical cycle before the prediction time point; is the actual power factor of the power grid at the current time point; x is an adjustable parameter, and its value range is (1, 2];

[0058] S3) When cosφ3 is greater than the upper threshold, perform a cut-out operation on the cyclic switching module, and give priority to cutting out the cyclic switching module with a longer operating time and the most recently put into operation. When cosφ3 is less than the lower threshold, perform an operation to put the cyclic switching module into operation, and give priority to putting into operation the cyclic switching module that is idle and has a longer cut-out time recently. When cosφ3 is greater than the upper threshold, perform a cut-out operation on the cyclic switching module, and give priority to cutting out the cyclic switching module with a longer operating time and the most recently put into operation. When cosφ3 is less than the lower threshold, perform an operation to put the cyclic switching module into operation, and give priority to putting into operation the cyclic switching module that is idle and has a longer cut-out time recently. The cyclic switching module with a longer cut-out time recently is preferentially put into operation.

[0059] In the present invention, when predicting the power factor of the power grid at the prediction time point, is introduced as an adjustment parameter. Its purpose is to eliminate or weaken the influence brought by the non-regular fluctuation of the power factor of the power grid. Specifically speaking, the replacement or increase in the number of electrical equipment may cause changes in the actual power factor of the power grid. This change is not caused by the start and stop of electrical equipment. If the influence brought by this change is not eliminated, it will lead to a certain deviation in the prediction of the power factor of the power grid at a future time point. This deviation will cause the actual power factor of the power grid at a future time point to be lower than the lower limit required by the industry or greater than or equal to 1, which makes it necessary to temporarily change the switching strategy of the cyclic switching module. By introducing the adjustment parameter the influence brought by the non-regular fluctuation of the power factor of the power grid can be eliminated or weakened, so that the actual power factor of the power grid at a future time point can still be above the lower limit required by the industry and not greater than 1, and it also enables the power grid to supply power stably.

[0060] Given that the power factor of the power grid changes with the increase or decrease of the power-consuming equipment connected to the grid, in addition to limiting the power grid to supply power when the power factor of the power grid is within a preset threshold range, in order to ensure that the power factor of the power grid after the switching operation of the cyclic switching module does not exceed the industry requirement range due to fluctuations, the strategy adopted by the present invention is as follows:

[0061] (1) In step S3), the power factor of the power grid after the cyclic switching module is put into operation should satisfy the following inequality:

[0062]

[0063] In the formula, is the power factor of the power grid at the same time point in the previous statistical cycle before the prediction time point;

[0064] (2) In step S3), the power factor of the power grid after the cyclic switching module is cut out should satisfy the following inequality:

[0065]

[0066] In the formula, is the power factor of the power grid at the same time point in the previous statistical cycle before the prediction time point.

[0067] In addition, reasons such as the adjustment of the start and stop times of the power-consuming equipment in the power grid will cause the power factor fluctuation curve of the power grid to shift forward or backward, which will also affect the prediction of the power factor of the power grid at a certain future time point, and further affect the switching operation of the cyclic switching module. In view of this, when the power factor fluctuation curve of the power grid shifts forward or backward on the time axis, the predicted value of the power factor of the power grid will not change significantly. In this case, only the following strategy is needed to process the switching operation of the cyclic switching module:

[0068] In step S2, according to the collected at each acquisition time point in the statistical cycle where the current time point is located, draw the actual power factor change curve in the statistical cycle where the current time point is located, and compare the actual power factor change curve in the statistical cycle where the current time point is located with the actual power factor change curve in the same period of history and output the comparison result;

[0069] In step S3), according to the comparison result of the actual power factor change curve in the statistical cycle where the current time point is located and the actual power factor change curve in the same period of history obtained in step S2), delay or advance the switching operation of the cyclic switching module. The specific strategy is as follows:

[0070] a) When the actual power factor change curve within the statistical period at the current time point moves forward relative to the actual power factor change curve in the same historical period by greater than or equal to 60 s, the switching operation of the cyclic switching module is advanced according to the preset switching strategy of the cyclic switching module; wherein, when advancing the switching of the cyclic switching module, the advance duration is calculated by the following formula :

[0071]

[0072] In the formula, is the duration of the forward movement of the actual power factor change curve within the statistical period at the current time point relative to the actual power factor change curve in the same historical period; both m and n are natural numbers, and n ≥ 2m;

[0073] b) When the actual power factor change curve within the statistical period at the current time point moves backward relative to the actual power factor change curve in the same historical period by greater than or equal to 60 s, the switching operation of the cyclic switching module is delayed according to the preset switching strategy of the cyclic switching module; wherein, when delaying the switching of the cyclic switching module, the delay duration is calculated by the following formula :

[0074]

[0075] In the formula, is the duration of the forward movement of the actual power factor change curve within the statistical period at the current time point relative to the actual power factor change curve in the same historical period; α is a regulation parameter, and its value range is [1, 4]. Preferably, the value range of α is [1.5, 2];

[0076] c) When the actual power factor change curve within the statistical period at the current time point moves forward less than 60 s relative to the actual power factor change curve in the same historical period or the actual power factor change curve within the statistical period at the current time point moves backward less than 60 s relative to the actual power factor change curve in the same historical period, the switching operation is carried out normally according to the preset switching strategy of the cyclic switching module.

[0077] When the power factor fluctuation curve of the power grid moves forward, advancing the switching of the cyclic switching module can effectively avoid the power factor of the power grid decreasing or increasing beyond the preset threshold range at a certain future time point. The advance duration is relatively shorter than the delay duration. The purpose is to avoid the change of the switching operation caused by the sudden increase or decrease of the power factor of the power grid. The longer delay duration is to reduce the switching frequency of the cyclic switching module and reduce the impact of current surges on the capacitors, which is beneficial to extending the service life of the capacitors.

[0078] Based on the above-mentioned cyclic switching control method, correspondingly, this example also provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the following steps are implemented: collecting the grid power factor cosφ2 at the current power time point, the most recent operation time point t1 and the most recent cut-out time point t2 of the cyclic switching module, and then calculating the most recent operation time of the cyclic switching unit according to the most recent operation time point t1 and the most recent cut-out time point t2 of the cyclic switching module and the most recent cut-out duration , and according to the latest operation time The size and the duration of the most recent cut-out The size of the cyclic switching module is sorted, and the power factor cosφ3 of the power grid in the time period T after the current time point is predicted based on the power factor cosφ0 of the historical power grid at the current time point and the power factor cosφ1 of the power grid at the same time point in the previous statistical cycle. Then, when cosφ3 is greater than the upper limit of the threshold, the output is used to cut out the cyclic switching module. The longer cycle switching module is switched out first. When cosφ3 is less than the lower limit of the threshold, the output is used to put the cycle switching module into operation. The module will be idle and the last switching out time will be Modules with longer switching cycles are put into operation first.

[0079] like Figure 3 As shown, based on the above-mentioned cyclic switching control method and computer-readable storage medium, in this embodiment, a computer device is further provided, which includes a readable storage medium, a processor, and a computer program stored on the readable storage medium and capable of running on the processor, wherein the readable storage medium and the processor are both arranged on a bus, and when the processor executes the computer program, the following steps are implemented: collecting the grid power factor cosφ2 at the current power time point, the most recent operation time point t1 and the most recent cut-out time point t2 of the cyclic switching module, and then calculating the most recent operation time of the cyclic switching unit according to the most recent operation time point t1 and the most recent cut-out time point t2 of the cyclic switching module and the most recent cut-out duration , and according to the latest operation time The size and the duration of the most recent cut-out The size of the cyclic switching module is sorted, and the power factor cosφ3 of the power grid in the time period T after the current time point is predicted based on the power factor cosφ0 of the historical power grid at the current time point and the power factor cosφ1 of the power grid at the same time point in the previous statistical cycle. Then, when cosφ3 is greater than the upper limit of the threshold, the output is used to cut out the cyclic switching module. The longer cyclic switching module is preferentially cut out. When cosφ3 is less than the lower threshold, an operation command for putting the cyclic switching module into operation is output, and the idle cyclic switching module with the longest cut-out duration recently The longer cyclic switching module is preferentially put into operation.

[0080] Obviously, the above 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. The obvious changes or modifications derived therefrom still fall within the protection scope of the claims of this patent application.

Claims

1. A cyclic switching control method, characterized in that It includes the following steps: S1) Data acquisition: Acquire the power factor cosφ2 of the power grid at the current time point, the most recent operation time point t1 and the most recent cut-out time point t2 of the cyclic switching module; S2) Data processing: Calculate the recent operation duration of the cyclic switching unit based on the most recent operation time point t1 and the most recent disconnection time point t2 of the cyclic switching module and the recent disconnection duration , and sort the cyclic switching module according to the magnitude of the recent operation duration and the magnitude of the recent disconnection duration ; Predict the power factor cosφ3 of the power grid within a time period of T after the current time point based on the historical synchronous power factor cosφ0 of the power grid at the current time point and the power factor cosφ1 of the power grid at the same time point in the previous statistical period. Among them, cosφ3 is calculated by the following formula: Wherein, is the actual power factor of the power grid at the same time point in the previous statistical period before the prediction time point; is the reactive power compensation power factor at the prediction time point; is an adjustment parameter, and its value range is [λ1, λ2], wherein, λ1 and λ2 are respectively calculated through the following formulas: Wherein, is the actual power factor of the grid in the same historical period at the current time point; is the actual power factor of the grid at the same time point in the previous statistical period before the current time point; is the actual power factor of the grid at the current time point; x is an adjustable parameter, and its value range is (1, 2]; S3) When cosφ3 is greater than the upper threshold, a cut-out operation is performed on the cyclic switching module, and the cyclic switching module that is in operation and has the longest recent operation duration is preferentially cut out. When cosφ3 is less than the lower threshold, an operation to put the cyclic switching module into operation is performed, and the cyclic switching module that is idle and has the longest recent cut-out duration is preferentially put into operation.

2. The cyclic switching control method according to claim 1, wherein In step S3), the power factor of the power grid after the loop switching module is put into operation shall satisfy the following inequality: In the formula, is the grid power factor at the same time point in the previous statistical period before the prediction time point.

3. The cyclic switching control method according to claim 1, wherein In step S3), the power factor of the power grid after the loop switching module cuts out shall satisfy the following inequality: In the formula, is the grid power factor at the same time point in the previous statistical period before the prediction time point.

4. The cyclic switching control method according to claim 1, characterized in that In step S2, according to the data collected at each acquisition time point in the statistical period corresponding to the current time point plot the actual power factor change curve within the statistical period corresponding to the current time point, compare the actual power factor change curve within the statistical period corresponding to the current time point with the actual power factor change curve in the same historical period, and output the comparison result; In step S3), according to the comparison result between the actual power factor change curve in the statistical period where the current time point is located and the actual power factor change curve in the historical synchronous period obtained in step S2), delay or advance the switching operation of the cyclic switching module. The specific strategy is: a) When the actual power factor change curve in the statistical period where the current time point is located moves forward relative to the actual power factor change curve in the historical synchronous period by greater than or equal to 60 s, advance the switching operation of the cyclic switching module according to the preset switching strategy of the cyclic switching module; b) When the actual power factor change curve in the statistical period where the current time point is located moves backward relative to the actual power factor change curve in the historical synchronous period by greater than or equal to 60 s, delay the switching operation of the cyclic switching module according to the preset switching strategy of the cyclic switching module; c) When the actual power factor change curve in the statistical period where the current time point is located moves forward relative to the actual power factor change curve in the historical synchronous period by less than 60 s or the actual power factor change curve in the statistical period where the current time point is located moves backward relative to the actual power factor change curve in the historical synchronous period by less than 60 s, perform the switching operation normally according to the preset switching strategy of the cyclic switching module.

5. The cyclic switching control method according to claim 4, wherein In strategy a), when the loop switching module is switched in advance, the advance duration is calculated by the following formula : Wherein, is the duration by which the actual power factor change curve in the statistical period at the current time point is advanced relative to the actual power factor change curve in the same historical period; both m and n are natural numbers, and n ≥ 2m.

6. The cyclic switching control method according to claim 4, wherein, In strategy b), when performing delayed switching on the cyclic switching module, the delay duration is calculated by the following formula :[[]]END]] In the formula, is the duration by which the actual power factor change curve in the statistical period at the current time point is advanced relative to the actual power factor change curve in the same historical period; α is a regulation parameter, and its value range is [1, 4].

7. The cyclic switching control method according to claim 6, wherein The value range of α is [1.5, 2].

8. A system for cyclic switching control using the cyclic switching control method according to claim 1, characterized in that, It includes: A data acquisition unit for real-time acquisition of the power factor cosφ2 of the power grid at the current time point, the most recent operation time point t1 and the most recent cut-out time point t2 of the cyclic switching module; 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 result of the data processing unit; A control unit for controlling the switching operation of the cyclic switching unit according to the data processing result 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. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the cyclic switching control method described in any one of claims 1 to 7.

10. A computer device, comprising a readable storage medium, a processor, and a computer program stored on the readable storage medium and executable on the processor, characterized in that, When the computer program is executed by a processor, it implements the cyclic switching control method described in any one of claims 1 to 7.

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