A frequency regulation monitoring system and method for a box-type energy storage power supply cabinet

Abstract

This invention discloses a frequency regulation monitoring system and method for a box-type energy storage power supply cabinet, relating to the field of output grid frequency control technology. The frequency regulation monitoring system for the box-type energy storage power supply cabinet includes: a data acquisition module; an audible and visual alarm module; and a frequency regulation control module. This invention acquires the impact load data when the frequency regulation unit connects to the grid and the response load data after grid connection, and monitors the output grid frequency of the frequency regulation unit in real time within a preset time period. Then, it compares the output grid frequency with the grid frequency setpoint to obtain the frequency deviation value. Next, based on the abnormal information of the output grid frequency, it adjusts the control parameters of the frequency regulation unit and performs secondary frequency regulation. Finally, it compensates for the frequency deviation value until the frequency deviation value is 0, thereby improving the frequency regulation accuracy of the frequency regulation unit during the frequency regulation monitoring process and solving the problem of inaccurate frequency regulation acquisition during the frequency regulation process in the prior art.

Description

Technical Field

[0001] This invention relates to the field of output power grid frequency regulation technology, and in particular to a frequency regulation monitoring system and method for a box-type energy storage power supply cabinet. Background Technology

[0002] With rapid global economic development and continuous population growth, energy demand has increased dramatically. Traditional energy resources such as coal and oil are becoming increasingly depleted, and their use leads to increasingly serious environmental pollution problems. Therefore, developing renewable energy and improving energy efficiency have become important issues for governments and enterprises worldwide. Box-type energy storage power supply cabinets, as an efficient, flexible, and environmentally friendly energy storage method, are gradually gaining market favor. Secondly, smart grids, as an important direction for the future development of power grids, require the realization of bidirectional energy flow, flexible dispatch, and efficient utilization. As an important component of smart grids, the frequency regulation monitoring system of box-type energy storage power supply cabinets needs to be able to monitor the operating status of energy storage devices in real time, achieving rapid response and precise control to meet the grid's frequency regulation requirements for energy storage devices.

[0003] The existing frequency regulation monitoring system of the box-type energy storage power supply cabinet collects and processes the operating status data of the energy storage equipment and the power grid data in real time through sensors installed on the energy storage equipment. At the same time, it uses intelligent control algorithms to perform frequency regulation control on the energy storage equipment, then performs fault diagnosis on the energy storage equipment during operation to identify abnormal situations and provide feedback on abnormalities, and finally realizes remote monitoring of the energy storage equipment through a remote control port.

[0004] For example, the invention patent announcement CN115800552B discloses an intelligent control system and method for power frequency regulation of supercapacitor operation, which includes: collecting power data of supercapacitor operation through a real-time acquisition unit and performing real-time capacitor processing on the collected data to obtain a power frequency regulation analysis signal group; monitoring the frequency regulation of the supercapacitor in real time through a supercapacitor frequency regulation monitoring unit and performing frequency regulation monitoring operation based on the monitoring data to obtain a positive and negative parameter group; preprocessing the frequency regulation of the supercapacitor through a supercapacitor frequency regulation preprocessing unit to obtain an evaluation data group; and judging the frequency regulation of the supercapacitor through a supercapacitor frequency regulation warning judgment unit and performing an early warning operation based on the judgment result to obtain a control value, and sending the control value to the communication terminal of the management personnel, who then perform power frequency regulation control based on the received control value.

[0005] For example, the invention patent announcement CN111509739B discloses a power grid frequency control method and system, which includes: real-time acquisition of the actual load value of each grid-connected generating unit; determining whether the actual load value is greater than the minimum stable combustion load of the grid-connected generating unit and less than the rated load of the grid-connected generating unit; if so, determining that the actual load value is within the load adjustable range; otherwise, determining that the primary frequency regulation capability of the current grid-connected generating unit is limited and issuing a limitation alarm; summing the primary frequency regulation load compensation of each grid-connected generating unit to calculate the total primary frequency regulation compensation load value of the power grid; and determining the power grid disconnection strategy based on the relationship between the power grid power change and the total primary frequency regulation compensation load value of the power grid.

[0006] However, in the process of implementing the inventive technical solution in the embodiments of this application, it was found that the above-mentioned technology has at least the following technical problems:

[0007] In the existing technology, the operating status and load characteristics of different frequency regulation units vary greatly. Secondly, during the frequency regulation process, the high power load generated by the frequency regulation unit causes fluctuations in the output deviation of the frequency regulation unit, resulting in a decrease in the accuracy of obtaining the deviation value of the frequency regulation unit in the box-type energy storage power supply cabinet during the frequency regulation process. There is a problem that the frequency regulation unit cannot accurately obtain the frequency regulation amount during the frequency regulation process. Summary of the Invention

[0008] This application provides a frequency regulation monitoring system and method for a box-type energy storage power supply cabinet, which solves the problem of inaccurate acquisition of frequency regulation quantity during the frequency regulation process of the existing technology, and improves the frequency regulation accuracy of the frequency regulation unit during the frequency regulation monitoring process.

[0009] This application provides a frequency regulation monitoring system for a box-type energy storage power supply cabinet, including: a data acquisition module, an audible and visual alarm module, and a frequency regulation control module; wherein, the data acquisition module is used to acquire the impact load data when the frequency regulation unit is connected to the grid, and simultaneously acquire the response load data after the frequency regulation unit is connected to the grid in real time and monitor the output grid frequency of the frequency regulation unit within a preset time period in real time, and the frequency regulation unit is connected to the transmission interface of the box-type energy storage power supply cabinet; the audible and visual alarm module is used to compare the output grid frequency with the grid frequency set value to obtain a frequency deviation value and determine whether the obtained frequency deviation value is within a preset safety threshold range. If the obtained frequency deviation value is within the preset safety threshold range, the monitoring of the output grid frequency of the frequency regulation unit within the preset time period continues; otherwise, an audible and visual alarm is triggered and corresponding measures are taken. The solution involves simultaneously monitoring the frequency modulation unit based on the frequency modulation analysis signal group. The frequency deviation value is the absolute value of the difference between the output grid frequency and the grid frequency setpoint. The audible and visual alarm is used to notify maintenance personnel of abnormal output grid frequency information. The frequency modulation control module is used to adjust the control parameters of the frequency modulation unit and perform secondary frequency modulation based on the abnormal output grid frequency information. At the same time, it performs deviation compensation on the frequency modulation unit based on the acquired frequency deviation value until the frequency deviation value is 0. The control parameters include current, voltage, and frequency modulation rate. The secondary frequency modulation means reducing the frequency deviation value within a preset time period. The deviation compensation means using the frequency deviation value as the compensation value of the frequency modulation unit to ensure that the output grid frequency recovers to the grid frequency setpoint within the preset time period. The secondary frequency modulation and deviation compensation work together.

[0010] Furthermore, the frequency modulation analysis signal group is the sum of low-frequency signal, high-frequency signal and ampere-frequency signal. The low-frequency signal is the signal generated when the output grid frequency is less than the grid frequency set value. The high-frequency signal is the signal generated when the output grid frequency is greater than the grid frequency set value. The ampere-frequency signal is the signal generated when the output grid frequency is equal to the grid frequency preset value. The frequency modulation monitoring operation includes parameter processing and loop regulation processing.

[0011] Furthermore, the specific operation flow of the parameter processing is as follows: the frequency modulation analysis signal group is identified; when a low-frequency signal is identified, low-frequency parameter processing is performed to reduce the proportion of low-frequency signals in the frequency modulation analysis signal group; when a high-frequency signal is identified, high-frequency parameter processing is performed to reduce the proportion of high-frequency signals in the frequency modulation analysis signal group; when an ampere-frequency signal is identified, the output grid frequency of the frequency modulation unit within a preset time period is continuously monitored.

[0012] The temperature control parameters and the ambient temperature control parameters are obtained. The temperature control parameters are the surface temperature of the frequency-controlled unit within a preset time period, and the ambient temperature control parameters are the frequency-controlled ambient temperature of the frequency-controlled unit within a preset time period.

[0013] Furthermore, the specific operation process of the ambient temperature regulation (AM) processing is as follows: The ambient temperature regulation (AM) evaluation index is obtained by combining the acquired frequency regulation response evaluation index with the temperature regulation data. The temperature regulation data is obtained based on the temperature regulation parameters and ambient temperature regulation parameters acquired within a preset time period. The temperature regulation data includes temperature parameter difference, temperature parameter ratio, average temperature parameter, and average temperature parameter difference. The AM evaluation index is used to evaluate the impact of the temperature conditions of the frequency regulation environment on the frequency regulation performance of the frequency regulation unit. The temperature is adjusted according to the acquired AM evaluation index until the temperature regulation parameters equal the corresponding ambient temperature regulation parameters. This temperature adjustment means adjusting the ambient temperature of the frequency regulation unit by adjusting the temperature parameter difference to reduce the impact of the temperature parameter difference on the frequency regulation of the frequency regulation unit. The calculation formula for the AM evaluation index is:

[0014] ;

[0015] In the formula, m is the number of the frequency modulation unit. M represents the total number of frequency regulation units, and n represents the preset time period number. N is the total number of preset time periods, and e is a natural constant. This represents the environmental control evaluation index of the m-th frequency regulating unit during the n-th preset time period. This represents the frequency regulation response evaluation index of the m-th frequency regulation unit during the n-th preset time period. This represents the temperature parameter difference of the m-th frequency regulating unit during the n-th preset time period. This represents the ratio of temperature parameters for the m-th frequency regulating unit during the n-th preset time period. This represents the average temperature parameter of the m-th frequency regulating unit during the n-th preset time period. This represents the average temperature parameter difference of the m-th frequency regulating unit during the n-th preset time period.

[0016] Furthermore, the step of adjusting the control parameters of the frequency regulation unit based on the abnormal information of the output grid frequency further includes obtaining frequency regulation monitoring indicators based on the waveform fluctuations of the control parameters on an oscilloscope. These frequency regulation monitoring indicators are used to measure the frequency regulation effect of the frequency regulation unit within a preset time period. The specific steps for obtaining the frequency regulation monitoring indicators are as follows: At preset current and voltage measurement points, the peak current and voltage fluctuation values ​​within a preset measurement period are recorded in real time using an oscilloscope and normalized. The preset measurement period includes one current peak and one voltage peak. The frequency regulation speed of the frequency regulation unit within the preset time period is monitored in real time using a speed sensor to obtain the frequency regulation rate and normalize it. A preset environmental regulation evaluation index correction factor is obtained from a preset database and combined with the normalized frequency regulation rate, peak current fluctuation value, and peak voltage fluctuation value to obtain the frequency regulation monitoring indicators. The frequency regulation rate is the ratio of the frequency regulation speed to the preset time period.

[0017] Furthermore, the frequency modulation monitoring index is calculated using the following formula:

[0018] ;

[0019] In the formula, h is the number of the preset current measurement point. H represents the total number of preset current measurement points, and q represents the number of the preset voltage measurement points. Q represents the total number of preset voltage measurement points. This represents the frequency regulation monitoring index of the m-th frequency regulation unit during the n-th preset time period. This represents the correction factor for environmental pollution control assessment indicators. This represents the frequency regulation rate of the m-th frequency regulating unit during the n-th preset time period. This represents the peak current fluctuation value of the m-th frequency regulating unit at the h-th preset current measurement point within the n-th preset time period. This represents the peak voltage fluctuation value of the m-th frequency regulating unit at the q-th preset voltage measurement point within the n-th preset time period.

[0020] Furthermore, the step of performing deviation compensation on the frequency regulation unit based on the obtained frequency deviation value further includes using the frequency regulation load compensation amount as the compensation value of the frequency regulation unit. The frequency regulation load compensation amount includes primary frequency regulation load compensation amount and secondary frequency regulation load compensation amount. Using the frequency regulation load compensation amount as the compensation value of the frequency regulation unit further includes combining the obtained frequency regulation load compensation amount, frequency deviation value, and frequency regulation monitoring indicators to obtain a deviation compensation impact assessment value. This deviation compensation impact assessment value is used to comprehensively evaluate the degree of impact of deviation compensation on the frequency stability of the output power grid. The deviation compensation impact assessment value is calculated using the following formula:

[0021] ;

[0022] ;

[0023] ;

[0024] In the formula, This represents the deviation compensation impact assessment value of the m-th frequency regulating unit during the n-th preset time period. This represents the primary frequency regulation load compensation amount of the m-th frequency regulating unit during the n-th preset time period. This represents the secondary frequency regulation load compensation amount of the m-th frequency regulating unit during the n-th preset time period. This represents the frequency deviation value of the m-th frequency regulating unit during the n-th preset time period. This represents the rated load of the m-th frequency regulating unit during a single frequency regulation process. This represents the rated speed of the m-th frequency regulating unit during a single frequency regulation process. This indicates the speed variability of the frequency regulating unit during a single frequency regulation process. Indicates the frequency modulation dead zone. This indicates the rated frequency of the frequency modulation unit during a single frequency modulation process. This represents the rated load of the m-th frequency regulating unit during the secondary frequency regulation process. This represents the rated speed of the m-th frequency regulating unit during the secondary frequency regulation process. This indicates the speed variability of the frequency regulating unit during the secondary frequency regulation process. Indicates the second frequency modulation dead zone. This indicates the rated frequency of the frequency modulation unit during the secondary frequency modulation process.

[0025] Furthermore, the specific process for compensating the frequency regulation unit for deviation based on the acquired frequency deviation value is as follows: The output grid frequency is adjusted within a preset time period based on the received adjustment amount to obtain a first frequency deviation value. The adjustment amount includes the frequency deviation value and the frequency regulation load compensation amount. The first frequency deviation value is the deviation between the adjusted output grid frequency and the grid frequency set value within the preset time period. When the first frequency deviation value is 0, the change in the output grid frequency of the frequency regulation unit within the preset time period is continuously monitored. When the first frequency deviation value is not 0, the output grid frequency is further adjusted based on the first frequency deviation value to obtain a second frequency deviation value until the second frequency deviation value is 0. The second frequency deviation value is the deviation between the adjusted output grid frequency and the grid frequency set value.

[0026] This application provides a frequency regulation monitoring system using any one of the following methods for a box-type energy storage power supply cabinet: S1, acquiring the impact load data when the frequency regulation unit is connected to the power grid, and simultaneously acquiring the response load data after the frequency regulation unit is connected to the power grid and monitoring the output power grid frequency of the frequency regulation unit within a preset time period in real time, wherein the frequency regulation unit is connected to the transmission interface of the box-type energy storage power supply cabinet; S2, comparing the output power grid frequency with the power grid frequency setpoint to obtain a frequency deviation value and determining whether the obtained frequency deviation value is within a preset safety threshold range; if the obtained frequency deviation value is within the preset safety threshold range, then continuing to monitor the output power grid frequency of the frequency regulation unit within the preset time period; otherwise, issuing an audible and visual alarm and taking corresponding measures. The solution involves simultaneously monitoring the frequency modulation unit based on the frequency modulation analysis signal group. The frequency deviation value is the absolute value of the difference between the output grid frequency and the grid frequency setpoint. The audible and visual alarm is used to notify maintenance personnel of abnormal information regarding the output grid frequency. S3, the control parameters of the frequency modulation unit are adjusted and secondary frequency modulation is performed based on the abnormal information regarding the output grid frequency. Simultaneously, deviation compensation is performed on the frequency modulation unit based on the acquired frequency deviation value until the frequency deviation value is 0. The control parameters include current, voltage, and frequency modulation rate. The secondary frequency modulation means reducing the frequency deviation value within a preset time period. The deviation compensation means using the frequency deviation value as the compensation value of the frequency modulation unit to ensure that the output grid frequency recovers to the grid frequency setpoint within the preset time period.

[0027] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0028] 1. By acquiring the impact load data when the frequency regulating unit is connected to the power grid and the response load data after connection, and by monitoring the output power grid frequency of the frequency regulating unit in real time within a preset time period, the output power grid frequency is compared with the power grid frequency setpoint to obtain the frequency deviation value. Then, the control parameters of the frequency regulating unit are adjusted according to the abnormal information of the output power grid frequency, and secondary frequency regulation is performed. At the same time, the frequency regulating unit is compensated for the deviation based on the acquired frequency deviation value until the frequency deviation value is 0. This improves the accuracy and reliability of secondary frequency regulation, thereby improving the frequency regulation accuracy of the frequency regulating unit during frequency regulation monitoring. This effectively solves the problem of inaccurate frequency regulation acquisition by the frequency regulating unit during frequency regulation in the existing technology.

[0029] 2. The instantaneous load waveform generated when the frequency regulation unit is connected to the power grid is obtained by acquiring the load impact assessment value through an oscilloscope. Then, the change of the load response data after the frequency regulation unit is connected to the power grid is monitored in real time to obtain the load response assessment value. Finally, the frequency regulation response assessment index is obtained by combining the obtained load impact assessment value and load response assessment value. This achieves more accurate acquisition of the load impact assessment value and load response assessment value, thereby improving the accuracy and reliability of the acquisition of the frequency regulation response assessment index.

[0030] 3. Adjust the output grid frequency within a preset time period based on the received adjustment amount to obtain a first frequency deviation value. When the first frequency deviation value is 0, continue to monitor the change of the output grid frequency of the frequency regulation unit within the preset time period. When the first frequency deviation value is not 0, continue to adjust the output grid frequency based on the first frequency deviation value to obtain a second frequency deviation value until the second frequency deviation value is 0. This achieves a more accurate acquisition of the first frequency deviation value, thereby improving the accuracy and reliability of deviation compensation. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of a frequency modulation monitoring system for a box-type energy storage power supply cabinet provided in an embodiment of this application;

[0032] Figure 2 A three-dimensional coordinate analysis diagram of the frequency modulation response evaluation index provided in the embodiments of this application;

[0033] Figure 3 A flowchart illustrating a frequency modulation monitoring method for a box-type energy storage power supply cabinet provided in this application embodiment. Detailed Implementation

[0034] This application provides a frequency regulation monitoring system and method for a box-type energy storage power supply cabinet, solving the problem of inaccurate frequency regulation acquisition during the frequency regulation process of existing frequency regulation units. The system acquires impact load data when the frequency regulation unit connects to the grid via a data acquisition module, and simultaneously acquires response load data after the unit connects to the grid and monitors the output grid frequency of the unit within a preset time period. Then, an audible and visual alarm module compares the output grid frequency with the grid frequency setpoint to obtain a frequency deviation value and determines whether the obtained frequency deviation value is within a preset safety threshold range. If the obtained frequency deviation value is within the preset safety threshold range, monitoring of the output grid frequency of the frequency regulation unit within the preset time period continues; otherwise, an audible and visual alarm is triggered and corresponding solutions are implemented. Simultaneously, frequency regulation monitoring is performed on the frequency regulation unit based on the frequency regulation analysis signal group. Then, the frequency regulation control module adjusts the control parameters of the frequency regulation unit and performs secondary frequency regulation based on abnormal information of the output grid frequency. Simultaneously, deviation compensation is performed on the frequency regulation unit based on the obtained frequency deviation value until the frequency deviation value is 0, thereby improving the frequency regulation accuracy of the frequency regulation unit during the frequency regulation monitoring process.

[0035] The technical solution in this application embodiment is to solve the problem of inaccurate frequency modulation quantity acquisition during the frequency modulation process of the aforementioned frequency modulation unit. The overall idea is as follows:

[0036] By acquiring the impact load data when the frequency regulation unit is connected to the grid and the response load data after connection, and monitoring the output grid frequency of the frequency regulation unit within a preset time period in real time, the output grid frequency is compared with the grid frequency setpoint to obtain the frequency deviation value. Then, the control parameters of the frequency regulation unit are adjusted according to the abnormal information of the output grid frequency and a secondary frequency regulation is performed. At the same time, the frequency regulation unit is compensated for the deviation based on the obtained frequency deviation value until the frequency deviation value is 0, thereby improving the frequency regulation accuracy of the frequency regulation unit during the frequency regulation monitoring process.

[0037] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0038] like Figure 1 The diagram shows a schematic of a frequency regulation monitoring system for a box-type energy storage power supply cabinet provided in this application embodiment. The system includes a data acquisition module, an audible and visual alarm module, and a frequency regulation control module. The data acquisition module acquires impact load data when the frequency regulation unit is connected to the grid, and simultaneously acquires response load data after the unit is connected to the grid and monitors the output grid frequency of the unit within a preset time period. The frequency regulation unit is connected to the box-type energy storage power supply cabinet via a transmission interface. The response load data reflects the frequency regulation unit's response capability to changes in grid load, and the impact load data reflects the instantaneous load waveform of the unit when connected to the grid. The audible and visual alarm module compares the output grid frequency with the grid frequency setpoint to obtain a frequency deviation value and determines whether the obtained frequency deviation value is within a preset safety threshold range. If the obtained frequency deviation value is within the preset safety threshold range, the system continues to monitor the frequency regulation unit's output grid frequency within the preset time period. The system outputs the grid frequency; otherwise, it issues an audible and visual alarm and takes corresponding corrective measures. Simultaneously, it monitors the frequency modulation of the generator unit based on the frequency modulation analysis signal group. The grid frequency setpoint is typically set by pre-defined personnel after summing and averaging historical output grid frequencies from a pre-defined database. The frequency deviation is the absolute value of the difference between the output grid frequency and the grid frequency setpoint. The audible and visual alarm is used to notify maintenance personnel of abnormal output grid frequency information, including the location, time, and type of the abnormal output grid frequency. The frequency modulation control module adjusts the control parameters of the generator unit and performs secondary frequency modulation based on the abnormal output grid frequency information. Simultaneously, it compensates for the frequency deviation based on the acquired frequency deviation value until the frequency deviation is zero. Control parameters include current, voltage, and frequency modulation rate. Secondary frequency modulation reduces the frequency deviation within a preset time period, while deviation compensation uses the frequency deviation value as compensation for the generator unit to ensure the output grid frequency recovers to the grid frequency setpoint within the preset time period. Secondary frequency modulation and deviation compensation work in tandem.

[0039] In this embodiment, the frequency deviation value is the absolute value of the difference between the output grid frequency and the grid frequency setpoint at each moment within a preset time period. The impact load data is the instantaneous change in grid load at the moment the frequency modulation unit is connected to the grid, and the instantaneous peak of the impact load is displayed on an oscilloscope. The response load data includes response time and adjustment amount. The response time represents the time required for the frequency modulation unit to start responding and adjusting its output power from the change in grid load. The adjustment amount is the amount of output power adjusted by the frequency modulation unit to cope with the change in grid load. The adjustment effect of the frequency modulation unit within the preset time period can be accurately evaluated through the response load data. The preset safety threshold range is usually the difference range between the historical maximum frequency deviation value and the historical minimum frequency deviation value in the preset database. When the grid operation status is judged to be abnormal, the audible and visual alarm module immediately activates the audible and visual alarm device, emitting a strong sound and light signal to remind the operator. At the same time, according to the corresponding countermeasures (such as starting the backup power supply and switching the grid load), the grid is restored to stable operation as soon as possible, which helps to stabilize the grid frequency output of the frequency modulation unit and improves the frequency modulation accuracy of the frequency modulation unit during the frequency modulation monitoring process.

[0040] Furthermore, the data acquisition module includes an impact load identification unit, a response load monitoring unit, and a frequency regulation response evaluation index acquisition unit. The impact load identification unit uses an oscilloscope to acquire the instantaneous load waveform generated when the frequency regulation unit connects to the grid to obtain a load impact assessment value. This load impact assessment value reflects the degree of impact of the frequency regulation unit on grid stability at the moment of grid connection. The response load monitoring unit monitors the changes in the response load waveform after the frequency regulation unit connects to the grid in real time to obtain a load response assessment value. This load response assessment value reflects the frequency regulation unit's response capability to grid load changes within a preset time period. The frequency regulation response evaluation index acquisition unit combines the acquired load impact assessment value and load response assessment value to obtain a frequency regulation response evaluation index. This index is used to evaluate the frequency regulation performance of the frequency regulation unit within a preset time period.

[0041] In this embodiment, the load impact assessment value is typically obtained by comparing the peak value of the instantaneous waveform displayed on the oscilloscope with a reference value, where the reference value is usually the waveform value when the oscilloscope is not connected to the grid power supply. The load impact assessment value is typically obtained by measuring the oscillation value of the response load waveform displayed on the oscilloscope when connected to the grid power supply within a preset time period. Here, the response load waveform is the load waveform generated by the frequency modulation unit during normal operation, and the oscillation value is the difference between the peak and trough values ​​of the response load waveform within the preset time period. Through real-time measurement with the oscilloscope, the load impact assessment value and response load assessment value when the frequency modulation unit is connected to the grid can be accurately obtained. For frequency modulation unit manufacturers and operators, these assessment indicators can also guide the optimized design and operation and maintenance of the frequency modulation unit, achieving more accurate acquisition of frequency modulation response assessment indicators.

[0042] Specifically, the frequency modulation response evaluation index is calculated using the following formula:

[0043] ;

[0044] In the formula, m is the number of the frequency modulation unit. M represents the total number of frequency regulation units, and n represents the preset time period number. N is the total number of preset time periods, and e is a natural constant. This represents the frequency regulation response evaluation index of the m-th frequency regulation unit during the n-th preset time period. This represents the load impact assessment value of the m-th frequency regulating unit during the n-th preset time period. This represents the load response assessment value of the m-th frequency regulating unit during the n-th preset time period.

[0045] Specifically, such as Figure 2 The figure shows a three-dimensional coordinate analysis diagram of the frequency regulation response evaluation index provided in the embodiment of this application. As can be seen from the figure, the frequency regulation response evaluation index decreases as the load impact evaluation value increases and increases as the load response evaluation value increases. It should be understood that the load impact evaluation value and the load response evaluation value not only jointly affect the value of the frequency regulation response evaluation index, but the load impact evaluation value also indirectly affects the value of the load response evaluation value. When the load impact evaluation value increases, it means that the load change caused by the frequency regulation unit connecting to the grid is more drastic. This drastic load change may require the frequency regulation unit to adjust its output power more quickly to maintain grid stability, thereby indirectly affecting the load response evaluation value.

[0046] Specifically, if the frequency regulation unit can respond quickly and accurately to such load surges, the load response assessment value will be relatively high, meaning that the frequency regulation unit can effectively adjust its output power when facing load surges. Conversely, if the response is slow or inaccurate, the load response assessment value will be low, meaning that the frequency regulation unit cannot respond to load surges in a timely manner, resulting in ineffective control of load fluctuations in the power grid. By comprehensively considering the influence between the load surge assessment value and the load response assessment value, it is helpful to more accurately assess the performance of the frequency regulation unit, improve the accuracy and reliability of obtaining frequency regulation response assessment indicators, and thus improve the frequency regulation accuracy of the frequency regulation unit during frequency regulation monitoring. This effectively solves the problem of inaccurate frequency regulation quantity acquisition by frequency regulation units during frequency regulation in existing technologies.

[0047] Furthermore, the frequency modulation analysis signal group includes low-frequency signals, high-frequency signals, and ampere-frequency signals. The low-frequency signal is the signal generated when the output grid frequency is less than the grid frequency set value. The high-frequency signal is the signal generated when the output grid frequency is greater than the grid frequency set value. The ampere-frequency signal is the signal generated when the output grid frequency is equal to the grid frequency preset value. The frequency modulation monitoring operation includes parameter processing and loop regulation processing.

[0048] In this embodiment, when the output grid frequency is lower than the grid frequency set value, a low-frequency signal is generated, which reflects the low grid frequency. Conversely, when the output grid frequency is higher than the grid frequency set value, a high-frequency signal is generated, which indicates that the grid frequency is too high. When the output grid frequency is exactly equal to the grid frequency preset value, an ampere frequency signal is generated, which indicates that the grid frequency is stable and the frequency regulation unit does not need to make any additional adjustments. The frequency regulation analysis signal group and the frequency regulation monitoring operation together constitute the main components of the frequency regulation unit. By collecting the output grid frequency in real time and generating corresponding control signals accordingly, the stability of the output grid frequency regulation is improved.

[0049] Furthermore, the specific operation process for parameter processing is as follows: The frequency modulation analysis signal group is identified. When a low-frequency signal is identified, low-frequency parameter processing is performed to reduce the proportion of low-frequency signals in the frequency modulation analysis signal group. When a high-frequency signal is identified, high-frequency parameter processing is performed to reduce the proportion of high-frequency signals in the frequency modulation analysis signal group. When an ampere-frequency signal is identified, the output grid frequency of the frequency modulation unit within a preset time period is continuously monitored. Temperature regulation parameters and ambient temperature regulation parameters are obtained. The temperature regulation parameter is the surface temperature of the frequency modulation unit within the preset time period, and the ambient temperature regulation parameter is the frequency modulation ambient temperature of the frequency modulation unit within the preset time period.

[0050] In this embodiment, the surface temperature (i.e., temperature regulation parameter) of the frequency modulation unit and the temperature of the frequency modulation environment (i.e., the ambient temperature regulation parameter) of the frequency modulation unit are typically measured in real time within a preset time period using a temperature sensor. The ambient temperature is usually the temperature of the cooling device in the frequency modulation unit. It should be noted that the maximum output power limit of the frequency modulation unit is usually also considered during parameter processing to avoid overload. The maximum output power limit is usually represented by the sum and average of the maximum historical output power in a preset database within a preset time period, thereby improving the accuracy and efficiency of parameter processing.

[0051] Furthermore, the specific operational process of the ambient temperature regulation (AM) is as follows: The ambient temperature regulation (AM) evaluation index is obtained by combining the acquired frequency regulation response evaluation index with the temperature regulation data. The temperature regulation data is obtained based on the temperature regulation parameters and ambient temperature regulation parameters acquired within a preset time period. The temperature regulation data includes temperature parameter difference, temperature parameter ratio, average temperature parameter, and average temperature parameter difference. The AM evaluation index is used to evaluate the impact of the ambient temperature conditions of the frequency regulation unit on its frequency regulation performance. Based on the acquired AM evaluation index, the temperature is adjusted until the temperature regulation parameters equal the corresponding ambient temperature regulation parameters. Temperature adjustment means adjusting the ambient temperature of the frequency regulation unit by adjusting the temperature parameter difference to reduce the impact of the temperature parameter difference on the frequency regulation of the unit. The calculation formula for the AM evaluation index is:

[0052] ;

[0053] In the formula, m is the number of the frequency modulation unit. M represents the total number of frequency regulation units, and n represents the preset time period number. N is the total number of preset time periods, and e is a natural constant. This represents the environmental control evaluation index of the m-th frequency regulating unit during the n-th preset time period. This represents the frequency regulation response evaluation index of the m-th frequency regulation unit during the n-th preset time period. This represents the temperature parameter difference of the m-th frequency regulating unit during the n-th preset time period. This represents the ratio of temperature parameters for the m-th frequency regulating unit during the n-th preset time period. This represents the average temperature parameter of the m-th frequency regulating unit during the n-th preset time period. This represents the average temperature parameter difference of the m-th frequency regulating unit during the n-th preset time period.

[0054] In this embodiment, the temperature parameter difference is the difference between the temperature control parameter and the loop temperature control parameter, which helps to understand the heat dissipation of the frequency regulation unit. The temperature parameter ratio is the ratio of the temperature control parameter to the loop temperature control parameter. The temperature parameter mean is the average of the temperature parameter differences. The temperature parameter average difference is the difference between the temperature parameter differences and the temperature parameter mean. When the difference between the temperature control parameter and the loop temperature control parameter is 0, that is... This indicates that the ambient temperature of the frequency modulation environment has no direct impact on the frequency modulation performance of the frequency modulation unit (or the impact is negligible). At this time, the corresponding... , .

[0055] It's important to understand that temperature parameter differences, temperature parameter ratios, temperature parameter averages, and temperature parameter average differences all have corresponding application scenarios in practice, and different temperature parameters are considered for different application scenarios. For example, in a scenario where it's necessary to analyze the heat dissipation performance of power equipment under dynamic load changes, the temperature parameter ratios and average temperatures are known. In this case, it's only necessary to obtain the temperature parameter average difference by comparing the temperature parameter differences with the temperature parameter averages. This average difference reflects whether the power equipment's heat dissipation system can quickly and stably adjust the temperature to maintain the normal operation of the power equipment when dealing with load fluctuations.

[0056] Frequency regulation response evaluation indicators also indirectly affect the value of temperature parameter differences. For example, if the response time of a frequency regulation unit is very short, it can adjust its output power more quickly to cope with changes in grid frequency. This usually reduces internal temperature changes caused by grid frequency fluctuations, thus affecting the temperature parameter differences. By considering the impact of frequency regulation response evaluation indicators on temperature parameter differences, it helps to reduce errors in frequency regulation units during frequency regulation, improve grid operating efficiency, and enhance the accuracy and reliability of environmental regulation evaluation indicators. This, in turn, improves the accuracy of deviation compensation values ​​obtained by frequency regulation units during frequency regulation, effectively solving the problem of inaccurate frequency regulation value acquisition in existing technologies.

[0057] Furthermore, the control parameters of the frequency regulation unit are adjusted based on the abnormal information of the output grid frequency. This includes obtaining frequency regulation monitoring indicators based on the waveform fluctuations of the control parameters on an oscilloscope. These indicators measure the frequency regulation effect of the frequency regulation unit within a preset time period. The specific steps for obtaining these indicators are as follows: At preset current and voltage measurement points, the peak current and voltage fluctuation values ​​within a preset measurement period are recorded in real-time using an oscilloscope and normalized. Each preset measurement period includes one current peak and one voltage peak. The peak current fluctuation value is the absolute value of the difference between the peak current within the preset measurement period and the peak current in an adjacent preset measurement period. The peak voltage fluctuation value is the absolute value of the difference between the peak voltage within the preset measurement period and the peak voltage in an adjacent preset measurement period. The frequency regulation speed of the frequency regulation unit within the preset time period is monitored in real-time using a speed sensor to obtain the frequency regulation rate, which is then normalized. A pre-set environmental regulation evaluation indicator correction factor is obtained from a preset database, and combined with the normalized frequency regulation rate, peak current fluctuation value, and peak voltage fluctuation value, the frequency regulation monitoring indicators are obtained. The frequency regulation rate is the ratio of the frequency regulation speed to the preset time period.

[0058] In this embodiment, it should be noted that the voltage waveform, current waveform, and load waveform do not consider the influence of harmonics. The frequency modulation speed is the operating speed of the mechanical equipment (such as the engine) in the frequency modulation unit within a preset time period. The preset current measurement point and preset voltage measurement point are set by preset personnel. The preset current measurement point is usually the input terminal of the current sensor, and the preset voltage measurement point is usually the power output terminal of the frequency modulation unit or both ends of the load. Normalization is used to make the data from different measurement points and different time periods comparable. When the voltage peak fluctuation value and the current peak fluctuation value are equal to 0, it indicates that the frequency modulation stability of the frequency modulation unit has improved in adjacent time periods. The voltage peak value and current peak value are the current peak value (i.e., the maximum value) when the voltage waveform is at its highest peak in the oscilloscope. It should be noted that the temperature of the oscilloscope also needs to be monitored in real time during the frequency modulation process of the frequency modulation unit to avoid overheating and affecting the measurement accuracy of the voltage peak value and current peak value, thus achieving more accurate acquisition of frequency modulation monitoring indicators.

[0059] Furthermore, the frequency modulation monitoring indicators are calculated using the following formula:

[0060] ;

[0061] In the formula, h is the number of the preset current measurement point. H represents the total number of preset current measurement points, and q represents the number of the preset voltage measurement points. Q represents the total number of preset voltage measurement points. This represents the frequency regulation monitoring index of the m-th frequency regulation unit during the n-th preset time period. This represents the correction factor for environmental pollution control assessment indicators. This represents the frequency regulation rate of the m-th frequency regulating unit during the n-th preset time period. This represents the peak current fluctuation value of the m-th frequency regulating unit at the h-th preset current measurement point within the n-th preset time period. This represents the peak voltage fluctuation value of the m-th frequency regulating unit at the q-th preset voltage measurement point within the n-th preset time period.

[0062] In this embodiment, to simplify the analysis, the following definition is used: , , In the formula, This represents the environmental regulation evaluation index coefficient of the m-th frequency regulating unit during the n-th preset time period. This represents the average fluctuation value of the peak current of the m-th frequency regulating unit during the n-th preset time period. Let represent the average peak voltage fluctuation of the m-th frequency regulating unit during the n-th preset time period. The simplified formula for calculating the frequency regulation monitoring index is: The statistical table of changes in frequency modulation monitoring indicators is shown in Table 1:

[0063] Table 1. Statistical Table of Changes in Frequency Modulation Monitoring Indicators

[0064]

[0065] It is important to understand that the frequency regulation monitoring index increases with the increase of the environmental regulation evaluation index coefficient and the frequency regulation rate, and decreases with the increase of the average fluctuation value of the peak current and the average fluctuation value of the peak voltage. The environmental regulation evaluation index correction factor is obtained from a preset database. In a specific embodiment, a mapping set of environmental regulation evaluation indexes and their corresponding correction factors is constructed based on the relationship between historical environmental regulation evaluation indexes and frequency regulation monitoring indexes in the preset database, and the real-time environmental regulation evaluation indexes are input into the mapping set to obtain the corresponding environmental regulation evaluation index correction factors.

[0066] In the calculation formula for frequency regulation monitoring indicators, the frequency regulation rate indirectly affects the values ​​of the average peak voltage fluctuation and the average peak current fluctuation. For example, when the frequency regulation rate increases, the generator needs to increase or decrease its output power to match the changes in system frequency. This rapid power adjustment may cause instantaneous fluctuations in the voltage and current inside the generator. By affecting the adjustment of the grid frequency output by the frequency regulation unit, the frequency regulation rate indirectly affects the values ​​of the average peak voltage fluctuation and the average peak current fluctuation, thereby improving the accuracy and stability of frequency regulation monitoring.

[0067] Similarly, the evaluation index coefficients of the environmental regulation also indirectly affect the values ​​of the average fluctuation value of the peak voltage and the average fluctuation value of the peak current. For example, during the environmental regulation process, the change of grid impedance will directly affect the distribution and loss of current in the grid load. If the impedance increases, the current will experience a voltage drop during transmission, resulting in a decrease in the peak voltage and thus a decrease in the average fluctuation value of the voltage. At the same time, the current will also increase when passing through the high impedance region, thereby increasing the average fluctuation value of the peak current. Conversely, a decrease in impedance will have the opposite effect.

[0068] By comprehensively considering the indirect impact of frequency regulation rate and the environmental regulation evaluation index coefficient on the average fluctuation of peak voltage and peak current, the values ​​of frequency regulation monitoring indicators are affected, and the response capability of the power grid when facing disturbances is indirectly adjusted. This helps to improve the overall stability and reliability of the power grid, improves the accuracy and reliability of frequency regulation monitoring indicator acquisition, and further improves the frequency regulation accuracy of frequency regulation units during frequency regulation monitoring. This effectively solves the problem of inaccurate acquisition of frequency regulation quantities by frequency regulation units in the existing technology.

[0069] Furthermore, based on the obtained frequency deviation value, deviation compensation is performed on the frequency regulation unit. This includes using the frequency regulation load compensation amount as the compensation value for the frequency regulation unit. The frequency regulation load compensation amount includes primary frequency regulation load compensation and secondary frequency regulation load compensation. The primary frequency regulation load compensation amount is the instantaneous deviation when the output grid frequency changes instantaneously during the primary frequency regulation process. The secondary frequency regulation load compensation amount is the adjustment deviation of the output grid frequency based on the instantaneous deviation generated by the primary frequency regulation. Using the frequency regulation load compensation amount as the compensation value for the frequency regulation unit, this process also includes combining the obtained frequency regulation load compensation amount, frequency deviation value, and frequency regulation monitoring indicators to obtain a deviation compensation impact assessment value. This deviation compensation impact assessment value is used to comprehensively evaluate the degree of impact of deviation compensation on the stability of the output grid frequency. The deviation compensation impact assessment value is calculated using the following formula:

[0070] ;

[0071] ;

[0072] ;

[0073] In the formula, This represents the deviation compensation impact assessment value of the m-th frequency regulating unit during the n-th preset time period. This represents the primary frequency regulation load compensation amount of the m-th frequency regulating unit during the n-th preset time period. This represents the secondary frequency regulation load compensation amount of the m-th frequency regulating unit during the n-th preset time period. This represents the frequency deviation value of the m-th frequency regulating unit during the n-th preset time period. This represents the rated load of the m-th frequency regulating unit during a single frequency regulation process. This represents the rated speed of the m-th frequency regulating unit during a single frequency regulation process. This indicates the speed variability of the frequency regulating unit during a single frequency regulation process. Indicates the frequency modulation dead zone. This indicates the rated frequency of the frequency modulation unit during a single frequency modulation process. This represents the rated load of the m-th frequency regulating unit during the secondary frequency regulation process. This represents the rated speed of the m-th frequency regulating unit during the secondary frequency regulation process. This indicates the speed variability of the frequency regulating unit during the secondary frequency regulation process. Indicates the second frequency modulation dead zone. This indicates the rated frequency of the frequency modulation unit during the secondary frequency modulation process. , , , .

[0074] In this embodiment, in addition to considering the deviation compensation of the frequency deviation value for the frequency regulation unit, the deviation compensation of the frequency regulation load for the frequency regulation unit is also considered. This helps to reflect the real-time changes in the output grid frequency and improves the stability and reliability of the grid frequency output. The primary frequency regulation load compensation usually represents the amount of load that needs to be increased or decreased in response to the instantaneous change in the output grid frequency. This instantaneous deviation is calculated based on the difference between the actual value of the output grid frequency and the grid frequency setpoint. Since the load compensation generated during the primary frequency regulation process cannot completely eliminate the output frequency deviation, a secondary frequency regulation is required. The secondary frequency regulation load compensation is calculated based on the deviation that still exists in the output grid frequency after the primary frequency regulation, which is usually the difference between the grid frequency setpoint and the output grid frequency after the primary frequency regulation.

[0075] The impact assessment value of deviation compensation decreases as the frequency regulation monitoring index increases, and increases as the frequency regulation load compensation amount and frequency deviation value increase. The rated load of the frequency regulation unit in primary frequency regulation is usually represented by the sum and average of the historical rated loads of primary frequency regulation in the preset database. The rated load of the frequency regulation unit in secondary frequency regulation is usually represented by the sum and average of the historical rated loads of secondary frequency regulation in the preset database. The rated speed of the frequency regulation unit in primary frequency regulation is usually represented by the sum and average of the historical rated speeds of primary frequency regulation in the preset database. The rated speed of the frequency regulation unit in secondary frequency regulation is usually represented by the sum and average of the historical rated speeds of secondary frequency regulation in the preset database. The rated frequency of the frequency regulation unit in primary frequency regulation is usually represented by the sum and average of the historical rated frequencies of primary frequency regulation in the preset database. The rated frequency of the frequency regulation unit in secondary frequency regulation is usually represented by the sum and average of the historical rated frequencies of secondary frequency regulation in the preset database.

[0076] The primary frequency regulation dead zone is typically the minimum allowable grid frequency output of the frequency regulating unit during the primary frequency regulation process. It is usually represented by the sum and average of historical minimum grid frequency outputs in a preset primary frequency regulation database. The secondary frequency regulation dead zone is typically the minimum allowable grid frequency output of the frequency regulating unit during the secondary frequency regulation process. It is usually represented by the sum and average of historical minimum grid frequency outputs in a preset secondary frequency regulation database. The speed unequalization rate of the frequency regulating unit during the primary frequency regulation process reflects the sensitivity of the frequency regulating unit to changes in grid load during the primary frequency regulation process. It is usually set by preset personnel after summing and averaging historical speed unequalization rates in a preset primary frequency regulation database. The speed unequalization rate of the frequency regulating unit during the secondary frequency regulation process reflects the sensitivity of the frequency regulating unit to changes in grid load during the secondary frequency regulation process. It is usually represented by the sum and average of historical speed unequalization rates in a preset secondary frequency regulation database.

[0077] In summary, by comprehensively considering the frequency deviation value and the frequency regulation load compensation amount for the deviation compensation of the frequency regulation unit, this embodiment significantly improves the stability and reliability of the grid frequency output. This method not only reflects the real-time changes in the output grid frequency, but also effectively reduces the frequency deviation through the synergistic effect of primary and secondary frequency regulation. In addition, this embodiment also accurately calculates the rated load, rated speed, and rated frequency of the frequency regulation unit using historical data in a preset database. These parameters are crucial for evaluating the performance of the frequency regulation unit. At the same time, primary and secondary frequency regulation dead zones are set to ensure that the grid frequency will not fall below the minimum allowable value during the frequency regulation process. This improves the accuracy and reliability of the deviation compensation impact assessment value, thereby improving the frequency regulation accuracy of the frequency regulation unit during frequency regulation monitoring. This effectively solves the problem of inaccurate frequency regulation quantity acquisition during the frequency regulation process in the prior art.

[0078] Furthermore, the specific process for compensating the frequency regulation unit for deviation based on the acquired frequency deviation value is as follows: The output grid frequency is adjusted within a preset time period based on the received adjustment amount to obtain a first frequency deviation value. The adjustment amount includes the frequency deviation value and the frequency regulation load compensation amount. The first frequency deviation value is the deviation between the adjusted output grid frequency and the grid frequency setpoint within the preset time period. When the first frequency deviation value is 0, the change in the output grid frequency of the frequency regulation unit within the preset time period is continuously monitored. When the first frequency deviation value is not 0, the output grid frequency is further adjusted based on the first frequency deviation value to obtain a second frequency deviation value until the second frequency deviation value is 0. The second frequency deviation value is the deviation between the adjusted output grid frequency and the grid frequency setpoint.

[0079] In this embodiment, when the first frequency deviation value is 0, it indicates that the initial adjustment has successfully eliminated the deviation. At this time, the frequency regulation unit continues to monitor the changes in the output grid frequency within a preset time period to prevent new deviations from occurring. When the first frequency deviation value is not 0, the output grid frequency is adjusted according to the first frequency deviation value to further reduce the deviation. This cyclical adjustment process continues until the second frequency deviation value (i.e., the deviation value measured again after adjustment based on the first frequency deviation value) is 0, indicating that the deviation has been completely eliminated. Through the above closed-loop control process, the output grid frequency can be continuously adjusted according to real-time feedback, thereby achieving precise control of the grid frequency. This dynamic adjustment mechanism helps to quickly respond to instantaneous changes in the grid frequency and effectively reduce the accumulation of frequency deviations, thus improving the accuracy of output grid frequency adjustment during deviation compensation.

[0080] like Figure 3The diagram shows a flowchart of a frequency regulation monitoring method for a box-type energy storage power supply cabinet provided in this application embodiment. The method includes the following steps: S1, acquiring impact load data when the frequency regulation unit is connected to the power grid, and simultaneously acquiring response load data after the frequency regulation unit is connected to the power grid and monitoring the output grid frequency of the frequency regulation unit within a preset time period. The frequency regulation unit is connected to the transmission interface of the box-type energy storage power supply cabinet. The response load data reflects the frequency regulation unit's response capability to changes in grid load, and the impact load data reflects the instantaneous load waveform of the frequency regulation unit when connected to the power grid; S2, comparing the output grid frequency with the grid frequency setpoint to obtain a frequency deviation value and determining whether the obtained frequency deviation value is within a preset safety threshold range. If the obtained frequency deviation value is within the preset safety threshold range, the monitoring of the output grid frequency of the frequency regulation unit within the preset time period continues; otherwise, an audible and visual alarm is triggered. Corresponding solutions are adopted, and frequency regulation monitoring is performed on the frequency regulation unit based on the frequency regulation analysis signal group. The grid frequency setpoint is usually set by preset personnel after summing and averaging the historical output grid frequencies in the preset database. The frequency deviation value is the absolute value of the difference between the output grid frequency and the grid frequency setpoint. The audible and visual alarm is used to notify the operation and maintenance personnel of abnormal information of the output grid frequency. The abnormal information is the location, time and type of the abnormal output grid frequency. S3, the control parameters of the frequency regulation unit are adjusted according to the abnormal information of the output grid frequency and secondary frequency regulation is performed. At the same time, the frequency regulation unit is compensated for the frequency deviation value according to the obtained frequency deviation value until the frequency deviation value is 0. The control parameters include current, voltage and frequency regulation rate. Secondary frequency regulation means reducing the frequency deviation value within a preset time period. Deviation compensation means using the frequency deviation value as the compensation value of the frequency regulation unit to ensure that the output grid frequency recovers to the grid frequency setpoint within the preset time period. Secondary frequency regulation and deviation compensation work together.

[0081] In this embodiment, secondary frequency regulation and deviation compensation work together. Secondary frequency regulation reduces frequency deviation by adjusting control parameters, while deviation compensation directly compensates for the deviation value. Together, they form a closed-loop control system that can respond to changes in the grid frequency in real time and quickly adjust the output of the frequency regulation unit to restore the stability of the grid frequency. In this process, by continuously monitoring the frequency deviation value and adjusting the control parameters and compensation amount as needed, until the frequency deviation value is reduced to 0, the accuracy and stability of the output grid frequency fluctuation recovery are improved.

[0082] In summary, this application embodiment acquires the impact load data when the frequency regulating unit is connected to the power grid and the response load data after connection, and monitors the output power grid frequency of the frequency regulating unit in real time within a preset time period. Then, it compares the output power grid frequency with the power grid frequency setpoint to obtain the frequency deviation value. Then, it adjusts the control parameters of the frequency regulating unit and performs secondary frequency regulation based on the abnormal information of the output power grid frequency. At the same time, it performs deviation compensation on the frequency regulating unit based on the obtained frequency deviation value until the frequency deviation value is 0, thereby improving the accuracy and reliability of secondary frequency regulation. This improves the frequency regulation accuracy of the frequency regulating unit during frequency regulation monitoring and effectively solves the problem of inaccurate frequency regulation acquisition by the frequency regulating unit during frequency regulation in the prior art.

[0083] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0084] This invention is described with reference to flowchart illustrations and / or block diagrams of systems, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0085] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0086] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0087] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0088] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A frequency regulation monitoring system for a box-type energy storage power supply cabinet, characterized in that, include: Data acquisition module, audible and visual alarm module, and frequency modulation control module; The data acquisition module is used to acquire the impact load data when the frequency regulation unit is connected to the grid, and at the same time acquire the response load data after the frequency regulation unit is connected to the grid and monitor the output grid frequency of the frequency regulation unit within a preset time period. The frequency regulation unit is connected to the transmission interface of the box-type energy storage power supply cabinet. The audible and visual alarm module is used to compare the output grid frequency with the grid frequency setpoint to obtain a frequency deviation value and determine whether the obtained frequency deviation value is within the preset safety threshold range. If the obtained frequency deviation value is within the preset safety threshold range, the output grid frequency of the frequency modulation unit will continue to be monitored within the preset time period; otherwise, an audible and visual alarm will be triggered and corresponding solutions will be taken. At the same time, frequency modulation monitoring operations will be performed on the frequency modulation unit according to the frequency modulation analysis signal group. The frequency deviation value is the absolute value of the difference between the output grid frequency and the grid frequency setpoint. The audible and visual alarm is used to notify the operation and maintenance personnel of abnormal information of the output grid frequency. The frequency regulation control module is used to adjust the control parameters of the frequency regulation unit and perform secondary frequency regulation based on the abnormal information of the output grid frequency. At the same time, it performs deviation compensation on the frequency regulation unit according to the obtained frequency deviation value until the frequency deviation value is 0. The control parameters include current, voltage and frequency regulation rate. The secondary frequency regulation means reducing the frequency deviation value within a preset time period. The deviation compensation means using the frequency deviation value as the compensation value of the frequency regulation unit to ensure that the output grid frequency recovers to the grid frequency setting value within the preset time period. The secondary frequency regulation and deviation compensation work together. The data acquisition module includes an impact load identification unit, a response load monitoring unit, and a frequency modulation response evaluation index acquisition unit. The impact load identification unit is used to acquire the instantaneous load waveform generated when the frequency regulation unit is connected to the power grid through an oscilloscope to obtain the load impact assessment value. The load impact assessment value is used to reflect the degree of impact of the frequency regulation unit on the stability of the power grid at the moment of connection to the power grid. The load response monitoring unit is used to monitor the changes in load response data after the frequency regulation unit is connected to the power grid in real time to obtain a load response evaluation value. The load response evaluation value is used to reflect the response capability of the frequency regulation unit to changes in power grid load within a preset time period. The frequency regulation response evaluation index acquisition unit is used to combine the acquired load impact evaluation value and load response evaluation value to obtain the frequency regulation response evaluation index, which is used to evaluate the frequency regulation performance of the frequency regulation unit within a preset time period. The frequency modulation analysis signal group is the sum of low-frequency signal, high-frequency signal, and ampere-frequency signal; the low-frequency signal is the signal generated when the output grid frequency is less than the grid frequency set value; the high-frequency signal is the signal generated when the output grid frequency is greater than the grid frequency set value; the ampere-frequency signal is the signal generated when the output grid frequency is equal to the grid frequency preset value; the frequency modulation monitoring operation includes parameter processing and loop regulation processing; The specific operation procedure for the environmental regulation process is as follows: The temperature regulation data is evaluated by combining the obtained frequency regulation response evaluation index to obtain the ambient temperature regulation evaluation index. The temperature regulation data is obtained based on the temperature regulation parameters and ambient temperature regulation parameters obtained within a preset time period. The temperature regulation data includes temperature parameter difference, temperature parameter ratio, temperature parameter mean, and temperature parameter mean difference. The ambient temperature regulation evaluation index is used to evaluate the impact of the temperature conditions of the frequency regulation environment of the frequency regulation unit on the frequency regulation performance. Based on the obtained environmental regulation evaluation indicators, the temperature is adjusted according to the temperature data until the temperature adjustment parameter is equal to the corresponding environmental regulation temperature parameter. The temperature adjustment means adjusting the ambient temperature of the frequency regulation unit by adjusting the temperature parameter difference to reduce the impact of the temperature parameter difference on the frequency regulation of the frequency regulation unit.

2. The frequency regulation monitoring system for a box-type energy storage power supply cabinet as described in claim 1, characterized in that, The specific operation flow for parameter processing is as follows: Step 1: Identify the frequency modulation analysis signal group: When a low-frequency signal is detected, low-frequency parameter processing is performed to reduce the proportion of low-frequency signals in the frequency modulation analysis signal group. When a high-frequency signal is detected, high-frequency parameter processing is performed to reduce the proportion of the high-frequency signal in the frequency modulation analysis signal group. When an ampere signal is detected, the output grid frequency of the frequency regulation unit within the preset time period will continue to be monitored. Step 2: Obtain the temperature control parameters and the ambient temperature control parameters. The temperature control parameters are the surface temperature of the frequency modulation unit within a preset time period, and the ambient temperature control parameters are the frequency modulation ambient temperature of the frequency modulation unit within a preset time period.

3. The frequency regulation monitoring system for a box-type energy storage power supply cabinet as described in claim 1, characterized in that, The calculation formula for the environmental pollution control assessment indicators is as follows: ； In the formula, m is the number of the frequency modulation unit. M represents the total number of frequency regulation units, and n represents the preset time period number. N is the total number of preset time periods, and e is a natural constant. This represents the environmental control evaluation index of the m-th frequency regulating unit during the n-th preset time period. This represents the frequency regulation response evaluation index of the m-th frequency regulation unit during the n-th preset time period. This represents the temperature parameter difference of the m-th frequency regulating unit during the n-th preset time period. This represents the ratio of temperature parameters for the m-th frequency regulating unit during the n-th preset time period. This represents the average temperature parameter of the m-th frequency regulating unit during the n-th preset time period. This represents the average temperature parameter difference of the m-th frequency regulating unit during the n-th preset time period.

4. The frequency regulation monitoring system for a box-type energy storage power supply cabinet as described in claim 1, characterized in that, The step of adjusting the control parameters of the frequency modulation unit based on the abnormal information of the output grid frequency further includes obtaining frequency modulation monitoring indicators based on the waveform fluctuations of the control parameters on an oscilloscope. These frequency modulation monitoring indicators are used to measure the frequency modulation effect of the frequency modulation unit within a preset time period. The specific steps for obtaining the frequency modulation monitoring indicators are as follows: At preset current and voltage measurement points, the peak current and peak voltage fluctuation values ​​of the current and voltage waveforms within a preset measurement period are recorded in real time using an oscilloscope and then normalized. The preset measurement period includes one current peak and one voltage peak. The frequency modulation speed of the frequency modulation unit within a preset time period is monitored in real time by a speed sensor to obtain the frequency modulation rate and normalize it. A preset environmental regulation evaluation index correction factor is obtained from a preset database and combined with the normalized frequency modulation rate, current peak fluctuation value and voltage peak fluctuation value to obtain the frequency modulation monitoring index. The frequency modulation rate is the ratio of the frequency modulation speed to the preset time period.

5. The frequency regulation monitoring system for a box-type energy storage power supply cabinet as described in claim 4, characterized in that, The frequency modulation monitoring index is calculated using the following formula: ； In the formula, h is the number of the preset current measurement point. H represents the total number of preset current measurement points, and q represents the number of the preset voltage measurement points. Q represents the total number of preset voltage measurement points. This represents the frequency regulation monitoring index of the m-th frequency regulation unit during the n-th preset time period. This represents the adjustment factor for environmental pollution control assessment indicators. This represents the frequency regulation rate of the m-th frequency regulating unit during the n-th preset time period. This represents the peak current fluctuation value of the m-th frequency regulating unit at the h-th preset current measurement point within the n-th preset time period. This represents the peak voltage fluctuation value of the m-th frequency regulating unit at the q-th preset voltage measurement point within the n-th preset time period.

6. The frequency regulation monitoring system for a box-type energy storage power supply cabinet as described in claim 1, characterized in that, The step of performing deviation compensation on the frequency modulation unit based on the obtained frequency deviation value further includes using the frequency modulation load compensation amount as the compensation value of the frequency modulation unit, wherein the frequency modulation load compensation amount includes the primary frequency modulation load compensation amount and the secondary frequency modulation load compensation amount. The step of using the frequency regulation load compensation amount as the compensation value for the frequency regulation unit further includes combining the obtained frequency regulation load compensation amount, frequency deviation value, and frequency regulation monitoring indicators to obtain a deviation compensation impact assessment value. This deviation compensation impact assessment value is used to comprehensively evaluate the degree of impact of deviation compensation on the frequency stability of the output power grid. The deviation compensation impact assessment value is calculated using the following formula: ； ； ； In the formula, This represents the deviation compensation impact assessment value of the m-th frequency regulating unit during the n-th preset time period. This represents the primary frequency regulation load compensation amount of the m-th frequency regulating unit during the n-th preset time period. This represents the secondary frequency regulation load compensation amount of the m-th frequency regulating unit during the n-th preset time period. This represents the frequency deviation value of the m-th frequency regulating unit during the n-th preset time period. This represents the rated load of the m-th frequency regulating unit during a single frequency regulation process. This represents the rated speed of the m-th frequency regulating unit during a single frequency regulation process. This indicates the speed variability of the frequency regulating unit during a single frequency regulation process. Indicates the frequency modulation dead zone. This indicates the rated frequency of the frequency modulation unit during a single frequency modulation process. This represents the rated load of the m-th frequency regulating unit during the secondary frequency regulation process. This represents the rated speed of the m-th frequency regulating unit during the secondary frequency regulation process. This indicates the speed variability of the frequency regulating unit during the secondary frequency regulation process. Indicates the second frequency modulation dead zone. This indicates the rated frequency of the frequency modulation unit during the secondary frequency modulation process.

7. The frequency regulation monitoring system for a box-type energy storage power supply cabinet as described in claim 6, characterized in that, The specific process for compensating the frequency modulation unit for deviation based on the acquired frequency deviation value is as follows: The output grid frequency is adjusted within a preset time period based on the received adjustment amount to obtain a first frequency deviation value. The adjustment amount includes the frequency deviation value and the frequency regulation load compensation amount. The first frequency deviation value is the deviation value between the adjusted output grid frequency and the grid frequency setting value within the preset time period. When the first frequency deviation value is 0, the frequency regulation unit continues to monitor the change of the output grid frequency within the preset time period. When the first frequency deviation value is not 0, the output grid frequency is adjusted according to the first frequency deviation value to obtain the second frequency deviation value until the second frequency deviation value is 0. The second frequency deviation value is the deviation between the output grid frequency after adjustment according to the first frequency deviation value and the grid frequency setting value.

8. A method for applying the frequency regulation monitoring system of a box-type energy storage power supply cabinet as described in any one of claims 1-7, characterized in that, Includes the following steps: S1, acquire the impact load data when the frequency regulation unit is connected to the power grid, and at the same time acquire the response load data after the frequency regulation unit is connected to the power grid and monitor the output power grid frequency of the frequency regulation unit in a preset time period. The frequency regulation unit is connected to the transmission interface of the box-type energy storage power supply cabinet. S2, compare the output grid frequency with the grid frequency setpoint to obtain the frequency deviation value and determine whether the obtained frequency deviation value is within the preset safety threshold range. If the obtained frequency deviation value is within the preset safety threshold range, continue to monitor the output grid frequency of the frequency modulation unit within the preset time period; otherwise, issue an audible and visual alarm and take corresponding solutions. At the same time, perform frequency modulation monitoring operation on the frequency modulation unit according to the frequency modulation analysis signal group. The frequency deviation value is the absolute value of the difference between the output grid frequency and the grid frequency setpoint. The audible and visual alarm is used to notify the operation and maintenance personnel of abnormal information of the output grid frequency. S3, adjust the control parameters of the frequency regulating unit and perform secondary frequency regulation based on the abnormal information of the output grid frequency. At the same time, perform deviation compensation on the frequency regulating unit according to the obtained frequency deviation value until the frequency deviation value is 0. The control parameters include current, voltage and frequency regulation rate. The secondary frequency regulation means reducing the frequency deviation value within a preset time period. The deviation compensation means using the frequency deviation value as the compensation value of the frequency regulating unit to ensure that the output grid frequency is restored to the grid frequency setting value within the preset time period.

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