Reactive voltage self-adaptive adjusting method for network-building type energy storage converter

Abstract

The invention relates to the technical field of converter management, in particular to a reactive voltage self-adaptive adjusting method for a network-building type energy storage converter. According to the method, the regulation and control process precision of the grid-connected energy storage converter is analyzed, so that the regulation and control stability and the response rate of the regulation and control process of the energy storage converter are improved, and regulation and control operation interference division analysis is performed on regulation and control evaluation information based on an information progressive mode; according to the staged adjustment scheme, targeted reactive voltage adjustment processing is carried out on a staged adjustment period in one day, so that damage to a power grid or an energy storage converter caused by too high reactive voltage adjustment frequency in a short time is avoided, and the stability and reliability of the power grid or the energy storage converter are improved; and self-adaptive regulation and control management demand analysis is carried out on the acquired evaluation data in an information feedback mode, so that operation and management personnel are reminded to carry out reasonable adjustment on the current reactive power regulation scheme in time, and the self-adaptive regulation and control efficiency of the reactive power regulation scheme is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of converter management, and in particular to a method for adaptively regulating reactive voltage of a grid-type energy storage converter. Background Art

[0002] Energy storage systems can play a role in shaving peaks and filling valleys, and smoothing out fluctuations in new energy sources. Therefore, energy forms that combine new energy sources with energy storage have been widely used. Compared with traditional grid-following control methods, grid-building energy storage converters use a virtual synchronous generator control method, which has inertia and damping characteristics, and can effectively reduce the impact of power electronic equipment on the grid. It can also independently build voltage and frequency, and has certain frequency and voltage regulation characteristics, which has obvious advantages under weak grids. However, in the prior art, it is impossible to supervise the control accuracy of the reactive voltage adaptive regulation process of the grid-type energy storage converter, resulting in the inability to effectively adjust the control stability and response rate of the grid-type energy storage converter regulation process, thereby reducing the regulation efficiency of the grid-type energy storage converter, and it is impossible to reasonably adjust the regulation scheme according to the regulation frequency distribution, thereby causing the reactive voltage regulation frequency to be too high, causing damage to the power grid or energy storage converter, and it is impossible to quantitatively evaluate and analyze the current regulation scheme, thereby reducing the continuous regulation effect of the regulation scheme; In view of the above technical defects, a solution is now proposed. Summary of the invention

[0003] The purpose of the present invention is to provide a method for adaptively regulating reactive voltage of a grid-connected energy storage converter to solve the technical defects mentioned above. The present invention analyzes the control process accuracy of the grid-connected energy storage converter in order to improve the supervision of the control process of the energy storage converter, so as to improve the control stability and response rate of the control process of the energy storage converter. The control evaluation information is divided and analyzed based on information progression, and analyzed in combination with the control operation interference level TD, that is, analyzed from the perspective of control frequency, and then targeted reactive voltage regulation is performed on the staged regulation period of the day according to the staged regulation scheme, so as to avoid damage to the power grid or energy storage converter caused by excessive reactive voltage regulation frequency in a short time, thereby helping to improve the stability and reliability of the power grid or energy storage converter.

[0004] The purpose of the present invention can be achieved by the following technical solution: A method for adaptively regulating reactive voltage of a grid-type energy storage converter comprises the following steps: Step 1: It is used to collect the control evaluation information and voltage deviation of the energy storage converter, and substitute the control evaluation information into step 2 for control operation interference division analysis and substitute the voltage deviation into step 3 for control process steady-state supervision analysis; Step 2: Based on the information progressive method, the control operation interference division analysis is performed on the control evaluation information, and the obtained control evaluation interference coefficient is discriminated to obtain the control operation interference level TD, and substituted into step 3; Step 3: Based on the information feedback method, the voltage deviation is subjected to steady-state supervision analysis during the regulation process, and the regulation operation interference level TD is analyzed, the actual working coefficient is discriminated and processed, and the obtained stable signal or alarm signal is output and fed back; Step 4: Based on the acquisition, processing and analysis of the period control frequency under the stable signal, the obtained period high frequency index is discriminated and processed to obtain the staged adjustment period and staged adjustment plan and output feedback; Step 5: Based on the premise of stable signals, conduct adaptive control management demand analysis on the collected evaluation data, perform discrimination processing on the obtained control efficiency evaluation coefficients, and output the obtained qualified or unqualified signals as feedback.

[0005] Preferably, the regulation operation interference division analysis process is as follows: The operating time period of the energy storage converter is collected and set as the time threshold, the time threshold is divided into i sub-time periods, i is a natural number greater than zero, and the control and evaluation information of the energy storage converter in each sub-time period is obtained. The control and evaluation information represents the control and evaluation index and the operating condition evaluation coefficient. The control and evaluation index and the operating condition evaluation coefficient are compared and analyzed with the preset control and evaluation index threshold and the preset operating condition evaluation coefficient threshold. The number of sub-time periods in the control and evaluation index and the operating condition evaluation coefficient that are not equal to the preset control and evaluation index and the operating condition evaluation coefficient threshold is set as the control and evaluation interference coefficient, and the control and evaluation interference coefficient is discriminated and processed to obtain primary interference, secondary interference and tertiary interference. The primary interference, secondary interference and tertiary interference are set as the control and operation interference level TD, TD=C1, C2, C3, 1<C1<C2<C3.

[0006] Preferably, the control evaluation index represents the number of deviations of the corresponding values ​​of the environmental information of the energy storage inverter from the preset environmental information range, and the environmental information includes temperature and humidity; the operating condition assessment coefficient represents the number of deviations of the corresponding values ​​of the operating characteristic parameters of the energy storage inverter from the preset threshold, and the operating characteristic parameters include operating temperature and mechanical vibration amplitude.

[0007] Preferably, the steady-state regulation analysis process of the regulation process is as follows: The voltage deviation between the voltage measurement value and the voltage target value of the photovoltaic power station grid-connected point within the time threshold is obtained, and it is set as the voltage control deviation value. The current control operation interference level TD within the time threshold is obtained, and the product value obtained by multiplying the voltage control deviation value and the control operation interference level TD is set as the voltage control matching value. The standard control information corresponding to the voltage control matching value is obtained, and the standard control information includes the control time range and the control rate range; The actual control information corresponding to the voltage control deviation value within the time threshold is obtained, and the actual control information includes the actual control duration and the actual control rate. The number of values ​​corresponding to the standard control information that the actual control information deviates from is obtained, and it is set as the actual working coefficient. The actual working coefficient is judged and processed to obtain a stable signal or an alarm signal.

[0008] Preferably, the period control frequency acquisition, processing and analysis process is as follows: A day is divided into m sub-time segments, where m is a natural number greater than zero. The number of control moments corresponding to each sub-time segment is obtained, and it is set as the time period control frequency, and the time period control frequency is judged: if the time period control frequency is greater than or equal to the preset time period control frequency threshold, the corresponding sub-time segment is judged to be a high-frequency time period; if the time period control frequency is less than the preset time period control frequency threshold, the corresponding sub-time segment is judged to be a low-frequency time period.

[0009] Preferably, the reactive voltage of the energy storage converter is regulated and recorded within the time threshold, and the regulation time of the reactive voltage of the energy storage converter for n days is randomly obtained from the regulation record, where n is a natural number greater than zero; Obtain the high-frequency time period in each day, and then obtain the frequency of the sub-time segment with the same frequency in the high-frequency time period of n days, and set it as the time period high-frequency index, and perform discrimination processing on the time period high-frequency index: if the time period high-frequency index is less than the preset time period high-frequency index threshold, no signal is generated; if the time period high-frequency index is greater than or equal to the preset time period high-frequency index threshold, a time period control signal is generated; When a time period control signal is generated, the high-frequency time period of the day corresponding to the time period control signal is obtained and set as the phased adjustment period. At the same time, the adjustment plan corresponding to the time period high-frequency index in the preset control area is obtained and set as the phased adjustment plan.

[0010] Preferably, the adaptive control management demand analysis process is as follows: Obtain the evaluation data of the reactive power regulation scheme of the current energy storage converter within the time threshold, the evaluation data includes the total number of regulation times and the number of regulation deviations, the number of regulation deviations indicates the number of times a single reactive voltage regulation fails or is not adjusted, a single reactive voltage regulation failure indicates that the voltage difference after adjustment is greater than a preset threshold, and the voltage difference indicates the difference between the voltage value and the voltage target value; The self-adjusting response value of the reactive power regulation scheme of the current energy storage converter within the time threshold is obtained, and the self-adjusting response value represents the average of the maximum value, the minimum value and the value of the time length between the time when the reactive voltage regulation instruction is generated and the time when the reactive voltage regulation ends.

[0011] Preferably, the ratio between the number of control deviations and the total number of controls is set as the control defect index, the control defect index and the self-adjustment response value are compared and analyzed with the preset control defect index and the self-adjustment response value thresholds, the number of control defect indices and self-adjustment response values ​​that are greater than or equal to the preset control defect index and the self-adjustment response value thresholds is set as the control efficiency evaluation coefficient, and the control efficiency evaluation coefficient is discriminated and processed to obtain a qualified signal or an unqualified signal.

[0012] The beneficial effects of the present invention are as follows: (1) The present invention analyzes the control process accuracy of the grid-connected energy storage converter in order to improve the supervision of the energy storage converter control process, thereby improving the control stability and response rate of the energy storage converter control process, and analyzes the control operation interference division of the control evaluation information based on the information progressive method, that is, analyzes from the perspective of control frequency, and then performs targeted reactive voltage regulation processing on the staged regulation period of the day according to the staged regulation scheme, so as to avoid damage to the power grid or energy storage converter caused by excessive reactive voltage regulation frequency in a short period of time, thereby helping to improve the stability and reliability of the power grid or energy storage converter; (2) The present invention analyzes the collected evaluation data in an adaptive control management demand manner through information feedback, that is, analyzes from the perspective of the control qualification rate to improve the evaluation accuracy of the current reactive power regulation scheme, and performs discrimination processing on the obtained control operation efficiency evaluation coefficient, and then reminds the operation management personnel to make reasonable adjustments to the current reactive power regulation scheme in a timely manner based on the output results, so as to improve the adaptive control efficiency of the reactive power regulation scheme and thus improve the grid voltage stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below in conjunction with the accompanying drawings; Figure 1 It is a reference analysis diagram of the method of the present invention. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] Embodiment 1: See also Figure 1 As shown, the present invention is a method for adaptively regulating reactive voltage of a grid-type energy storage converter, comprising the following steps: Step 1: It is used to collect the control evaluation information and voltage deviation of the energy storage converter, and substitute the control evaluation information into step 2 for control operation interference division analysis and substitute the voltage deviation into step 3 for control process steady-state supervision analysis; Step 2: Based on the information progressive method, the control operation interference division analysis is performed on the control evaluation information, and the obtained control evaluation interference coefficient is discriminated to obtain the control operation interference level TD, and substituted into step 3; Step 3: Perform steady-state supervision analysis on the voltage deviation control process based on information feedback, perform discrimination processing on the actual working coefficient, and output the obtained stable signal or alarm signal as feedback; Step 4: Based on the acquisition, processing and analysis of the period control frequency under the stable signal, the obtained period high frequency index is discriminated and processed to obtain the staged adjustment period and staged adjustment plan and output feedback; Step 5: Based on the premise of stable signals, the collected evaluation data is analyzed for adaptive control management needs, and combined with the control operation interference level TD for analysis, the obtained control operation efficiency evaluation coefficient is processed for discrimination, and the obtained qualified or unqualified signal is output as feedback; The present invention analyzes the control process accuracy of the grid-connected energy storage converter in order to improve the supervision of the energy storage converter control process, so as to improve the control stability and response rate of the energy storage converter control process, and analyzes the control operation interference division of the control evaluation information based on the information progressive method, that is, analyzes from the perspective of control frequency, and then performs targeted reactive voltage regulation processing on the staged regulation period of the day according to the staged regulation scheme, so as to avoid damage to the power grid or energy storage converter caused by excessive reactive voltage regulation frequency in a short time, thereby helping to improve the stability and reliability of the power grid or energy storage converter; The collected evaluation data is analyzed for adaptive control management needs through information feedback, that is, it is analyzed from the perspective of control qualification rate to improve the evaluation accuracy of the current reactive power regulation scheme, and the obtained control operation efficiency evaluation coefficient is processed for discrimination, and then the operation management personnel are reminded to make reasonable adjustments to the current reactive power regulation scheme in a timely manner based on the output results, so as to improve the adaptive control efficiency of the reactive power regulation scheme and thus improve the grid voltage stability; In the embodiment of the present invention, the control operation interference division analysis process is as follows: The operating time period of the energy storage converter is collected and set as the time threshold, the time threshold is divided into i sub-time periods, i is a natural number greater than zero, and the control evaluation information of the energy storage converter in each sub-time period is obtained. The control evaluation information represents the control evaluation index and the working condition evaluation coefficient. The control evaluation index and the working condition evaluation coefficient are compared and analyzed with the preset control evaluation index threshold and the preset working condition evaluation coefficient threshold. The number of sub-time periods corresponding to the control evaluation index and the working condition evaluation coefficient that are not equal to the preset control evaluation index and the working condition evaluation coefficient threshold is set as the control evaluation interference coefficient, and the control evaluation interference coefficient is discriminated: If the control evaluation interference coefficient = 0, it is determined to be a first-level interference; If the control evaluation interference coefficient = 1, it is determined to be a secondary interference; If the control evaluation interference coefficient = 2, it is determined to be a third-level interference, wherein the control interference degrees corresponding to the first-level interference, the second-level interference and the third-level interference increase in sequence, and the first-level interference, the second-level interference and the third-level interference are set as the control operation interference level TD, TD = C1, C2, C3, that is, when the control operation interference level TD = C1, it represents the control operation interference factor corresponding to the first-level interference, when the control operation interference level TD = C2, it represents the control operation interference factor corresponding to the second-level interference, when the control operation interference level TD = C3, it represents the control operation interference factor corresponding to the third-level interference, 1 < C1 < C2 < C3; In the embodiment of the present invention, the control evaluation index indicates the number of deviations of the corresponding value of the environmental information of the energy storage converter from the preset environmental information range, and the environmental information includes temperature, humidity, etc. It should be noted that the larger the value of the control evaluation index, the greater the risk of interference to the energy storage converter, and the greater the risk of control error; In the embodiment of the present invention, the operating condition assessment coefficient represents the number of corresponding values ​​of the operating characteristic parameters of the energy storage inverter that exceed the preset threshold value. The operating characteristic parameters include operating temperature, mechanical vibration amplitude, etc. It should be noted that the larger the value of the operating condition assessment coefficient, the greater the risk of abnormal control error of the energy storage inverter.

[0016] Embodiment 2: The steady-state regulation analysis process of the regulation process is as follows: The voltage deviation between the voltage measurement value and the voltage target value of the photovoltaic power station grid connection point within the time threshold is obtained, and it is set as the voltage control deviation value. The current control operation interference level TD within the time threshold is obtained, and the product value obtained by multiplying the voltage control deviation value and the control operation interference level TD is set as the voltage control matching value. The standard control information corresponding to the voltage control matching value is obtained, and the standard control information includes the control time range, the control rate range, etc.; The actual control information corresponding to the voltage control deviation value within the time threshold is obtained. The actual control information includes the actual control duration, the actual control rate, etc. The number of values ​​corresponding to the actual control information that deviate from the standard control information is obtained, and it is set as the actual working coefficient, and the actual working coefficient is judged: If the actual working coefficient is equal to zero, a stable signal is generated; If the actual working coefficient is not equal to zero, an alarm signal is generated. When a stable signal or an alarm signal is generated, a preset early warning operation corresponding to the stable signal or the alarm signal is immediately performed, so as to improve the supervision of the energy storage converter regulation process, so as to improve the regulation stability and speed of the energy storage converter regulation process; Based on the acquisition, processing and analysis of the period control frequency under the stable signal, the specific period control frequency acquisition, processing and analysis process is as follows: Divide a day into m sub-segments, where m is a natural number greater than zero, obtain the number of control moments corresponding to each sub-segment, set it as the time period control frequency, and perform discrimination processing on the time period control frequency: If the time period control frequency is greater than or equal to the preset time period control frequency threshold, the corresponding sub-time period is determined to be a high-frequency time period; If the time period control frequency is less than the preset time period control frequency threshold, the corresponding sub-time period is determined to be a low-frequency period; In the embodiment of the present invention, for example, a day is divided into 12 segments, that is, m=12, and 2 hours is a time segment. If the time segment control frequency in a day is concentrated in the second and sixth segments, the second and sixth segments are set as high-frequency segments, and the rest are low-frequency segments. It should be noted that the division method of a day is set according to demand; The reactive voltage of the energy storage converter is regulated and recorded within the time threshold, and the regulation time of the reactive voltage of the energy storage converter for n days is randomly obtained from the regulation record, where n is a natural number greater than zero; Get the high-frequency time period in each day, and then get the frequency of the high-frequency time period in n days corresponding to the sub-time segment, set it as the time period high-frequency index, and perform discrimination processing on the time period high-frequency index: If the period high frequency index is less than the preset period high frequency index threshold, no signal is generated; If the time period high frequency index is greater than or equal to the preset time period high frequency index threshold, a time period control signal is generated; When a time period control signal is generated, the high-frequency time period of the day corresponding to the time period control signal is obtained, and it is set as a phased adjustment period. At the same time, the adjustment scheme corresponding to the time period high-frequency index in the preset control area is obtained, and it is set as a phased adjustment scheme. Then, according to the phased adjustment scheme, targeted reactive voltage regulation processing is performed on the phased adjustment period of the day to avoid damage to the power grid or energy storage inverter due to excessive reactive voltage regulation frequency in a short period of time, which helps to improve the stability and reliability of the power grid or energy storage inverter.

[0017] Embodiment three: Based on the premise of stable signals, the collected evaluation data is analyzed for adaptive control management needs. The specific adaptive control management needs analysis process is as follows: Obtain the evaluation data of the reactive power regulation scheme of the current energy storage converter within the time threshold, the evaluation data includes the total number of regulation times and the number of regulation deviations, the number of regulation deviations indicates the number of times a single reactive voltage regulation fails or is not adjusted, a single reactive voltage regulation failure indicates that the voltage difference after adjustment is greater than a preset threshold, and the voltage difference indicates the difference between the voltage value and the voltage target value; Obtain the self-adjusting response value of the reactive power regulation scheme of the current energy storage converter within the time threshold, the self-adjusting response value represents the average of the maximum value, the minimum value and the value of the duration between the time when the reactive voltage regulation instruction is generated and the time when the reactive voltage regulation ends. It should be noted that whether the reactive power regulation scheme of the current energy storage converter is qualified is evaluated from the perspective of reactive voltage regulation response, so as to rationally adjust the reactive power regulation scheme of the current energy storage converter, so as to improve the adaptive regulation efficiency of the reactive power regulation scheme of the current energy storage converter; The ratio between the number of control deviations and the total number of controls is set as the control defect index, the control defect index and the self-adjustment response value are compared and analyzed with the preset control defect index and the self-adjustment response value threshold, the number of control defect indexes and the self-adjustment response values ​​that are greater than or equal to the preset control defect index and the self-adjustment response value threshold is set as the control operation efficiency evaluation coefficient, and the control operation efficiency evaluation coefficient is discriminated: If the control efficiency evaluation coefficient = 0, a qualified signal is generated; If the control operation efficiency evaluation coefficient = 1 or the control operation efficiency evaluation coefficient = 2, an unqualified signal is generated. When a qualified signal or an unqualified signal is generated, the preset early warning operation corresponding to the qualified signal or the unqualified signal is immediately made to remind the operation management personnel to make reasonable adjustments to the current reactive power regulation plan in a timely manner, so as to improve the adaptive control efficiency of the reactive power regulation plan and thereby improve the grid voltage stability.

[0018] The threshold is set to facilitate comparison. The size of the threshold depends on the amount of sample data and the number of bases set by technicians in this field for each group of sample data; as long as it does not affect the proportional relationship between the parameter and the quantized value.

[0019] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for adaptively regulating reactive voltage of a grid-connected energy storage converter, characterized in that: The following steps are involved: Step 1: It is used to collect the control evaluation information and voltage deviation of the energy storage converter, and substitute the control evaluation information into step 2 for control operation interference division analysis and substitute the voltage deviation into step 3 for control process steady-state supervision analysis; Step 2: Based on the information progressive method, the control operation interference division analysis is performed on the control evaluation information, and the obtained control evaluation interference coefficient is discriminated to obtain the control operation interference level TD, and substituted into step 3; Step 3: Based on the information feedback method, the voltage deviation is subjected to steady-state supervision analysis during the regulation process, and the regulation operation interference level TD is analyzed, the actual working coefficient is discriminated and processed, and the obtained stable signal or alarm signal is output and fed back; Step 4: Based on the acquisition, processing and analysis of the period control frequency under the stable signal, the obtained period high frequency index is discriminated and processed to obtain the staged adjustment period and staged adjustment plan and output feedback; Step 5: Based on the premise of stable signals, conduct adaptive control management demand analysis on the collected evaluation data, perform discrimination processing on the obtained control efficiency evaluation coefficients, and output the obtained qualified or unqualified signals as feedback.

2. A method for adaptively regulating reactive voltage of a grid-connected energy storage converter according to claim 1, characterized in that: The control operation interference division analysis process is as follows: The operating time period of the energy storage converter is collected and set as the time threshold, the time threshold is divided into i sub-time periods, i is a natural number greater than zero, and the control and evaluation information of the energy storage converter in each sub-time period is obtained. The control and evaluation information represents the control and evaluation index and the operating condition evaluation coefficient. The control and evaluation index and the operating condition evaluation coefficient are compared and analyzed with the preset control and evaluation index threshold and the preset operating condition evaluation coefficient threshold. The number of sub-time periods in the control and evaluation index and the operating condition evaluation coefficient that are not equal to the preset control and evaluation index and the operating condition evaluation coefficient threshold is set as the control and evaluation interference coefficient, and the control and evaluation interference coefficient is discriminated and processed to obtain primary interference, secondary interference and tertiary interference. The primary interference, secondary interference and tertiary interference are set as the control and operation interference level TD, TD=C1, C2, C3, 1<C1<C2<C3.

3. A method for adaptively regulating reactive voltage of a grid-connected energy storage converter according to claim 2, characterized in that: The control evaluation index indicates the number of times that the corresponding values ​​of the environmental information of the energy storage inverter deviate from the preset environmental information range, and the environmental information includes temperature and humidity; the operating condition evaluation coefficient indicates the number of times that the corresponding values ​​of the operating characteristic parameters of the energy storage inverter exceed the preset threshold, and the operating characteristic parameters include operating temperature and mechanical vibration amplitude.

4. A method for adaptively regulating reactive voltage of a grid-connected energy storage converter according to claim 3, characterized in that: The steady-state regulation analysis process of the regulation process is as follows: The voltage deviation between the voltage measurement value and the voltage target value of the photovoltaic power station grid-connected point within the time threshold is obtained, and it is set as the voltage control deviation value. The current control operation interference level TD within the time threshold is obtained, and the product value obtained by multiplying the voltage control deviation value and the control operation interference level TD is set as the voltage control matching value. The standard control information corresponding to the voltage control matching value is obtained, and the standard control information includes the control time range and the control rate range; The actual control information corresponding to the voltage control deviation value within the time threshold is obtained, and the actual control information includes the actual control duration and the actual control rate. The number of values ​​corresponding to the standard control information that the actual control information deviates from is obtained, and it is set as the actual working coefficient. The actual working coefficient is judged and processed to obtain a stable signal or an alarm signal.

5. A method for adaptively regulating reactive voltage of a grid-connected energy storage converter according to claim 1, characterized in that: The acquisition, processing and analysis process of the period control frequency is as follows: Divide a day into m sub-segments, where m is a natural number greater than zero, obtain the number of control moments corresponding to each sub-segment, set it as the time period control frequency, and perform discrimination processing on the time period control frequency: if the time period control frequency is greater than or equal to the preset time period control frequency threshold, then determine that the corresponding sub-segment is a high-frequency time period; If the time period control frequency is less than the preset time period control frequency threshold, the corresponding sub-time period is determined to be a low-frequency time period.

6. A method for adaptively regulating reactive voltage of a grid-connected energy storage converter according to claim 5, characterized in that: The reactive voltage of the energy storage converter is regulated and recorded within the time threshold, and the regulation time of the reactive voltage of the energy storage converter for n days is randomly obtained from the regulation record, where n is a natural number greater than zero; Obtain the high-frequency time period in each day, and then obtain the frequency of the sub-time segment with the same frequency in the high-frequency time period of n days, and set it as the time period high-frequency index, and perform discrimination processing on the time period high-frequency index: if the time period high-frequency index is less than the preset time period high-frequency index threshold, no signal is generated; if the time period high-frequency index is greater than or equal to the preset time period high-frequency index threshold, a time period control signal is generated; When a time period control signal is generated, the high-frequency time period of the day corresponding to the time period control signal is obtained and set as the phased adjustment period. At the same time, the adjustment plan corresponding to the time period high-frequency index in the preset control area is obtained and set as the phased adjustment plan.

7. A method for adaptively regulating reactive voltage of a grid-connected energy storage converter according to claim 1, characterized in that: The adaptive control management demand analysis process is as follows: Obtain the evaluation data of the reactive power regulation scheme of the current energy storage converter within the time threshold, the evaluation data includes the total number of regulation times and the number of regulation deviations, the number of regulation deviations indicates the number of times a single reactive voltage regulation fails or is not adjusted, a single reactive voltage regulation failure indicates that the voltage difference after adjustment is greater than a preset threshold, and the voltage difference indicates the difference between the voltage value and the voltage target value; The self-adjusting response value of the reactive power regulation scheme of the current energy storage converter within the time threshold is obtained, and the self-adjusting response value represents the average of the maximum value, the minimum value and the value of the time length between the time when the reactive voltage regulation instruction is generated and the time when the reactive voltage regulation ends.

8. A method for adaptively regulating reactive voltage of a grid-connected energy storage converter according to claim 7, characterized in that: The ratio of the number of control deviations to the total number of controls is set as the control defect index, the control defect index and the self-adjustment response value are compared and analyzed with the preset control defect index and self-adjustment response value thresholds, the number of control defect indices and self-adjustment response values ​​that are greater than or equal to the preset control defect index and self-adjustment response value thresholds is set as the control efficiency evaluation coefficient, and the control efficiency evaluation coefficient is discriminated and processed to obtain a qualified signal or an unqualified signal.

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