Frequency modulation monitoring system and method for box-type energy storage power supply cabinet

Abstract

The invention discloses a frequency modulation monitoring system and method for a box-type energy storage power supply cabinet, and relates to the technical field of output power grid frequency regulation and control. The frequency modulation monitoring system of the box-type energy storage power supply cabinet comprises a data acquisition module; an acousto-optic alarm module; and a frequency modulation control module. The method comprises the following steps: acquiring impact load data when a frequency modulation unit is connected to a power grid and response load data after the frequency modulation unit is connected to the power grid, monitoring an output power grid frequency of the frequency modulation unit in a preset time period in real time, and comparing the output power grid frequency with a power grid frequency set value to obtain a frequency deviation value; adjusting the control parameters of the frequency modulation unit according to the abnormal information of the output power grid frequency and performing secondary frequency modulation, and finally performing deviation compensation on the frequency modulation unit according to the obtained frequency deviation value until the frequency deviation value is 0, thereby improving the frequency modulation accuracy of the frequency modulation unit in the frequency modulation monitoring process. The problem that in the prior art, the frequency modulation quantity of a frequency modulation unit is not accurately obtained in the frequency modulation process is solved.

Description

Technical Field

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

[0002] With the rapid development of the global economy and the continuous growth of the population, the demand for energy has increased dramatically. Traditional energy resources such as coal and oil are becoming increasingly depleted, and the environmental pollution caused by their use is becoming increasingly serious. Therefore, the development of renewable energy and the improvement of energy efficiency have become important issues for governments and enterprises. As an efficient, flexible and environmentally friendly energy storage method, the box-type energy storage power supply cabinet is gradually gaining favor in the market. Secondly, as an important development direction of the future power grid, the smart grid requires the realization of two-way flow, flexible scheduling and efficient utilization of energy. As an important part of the smart grid, the box-type energy storage power supply cabinet needs to be able to monitor the operating status of the energy storage equipment in real time, achieve rapid response and precise control, so as to meet the power grid's frequency regulation requirements for energy storage equipment.

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

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

[0005] For example, the invention patent announcement with announcement number: CN111509739B announces a power grid frequency control method and system, including: real-time collection of the actual load value of each grid-connected operating unit, judging whether the actual load value is greater than the minimum stable combustion load of the grid-connected operating unit and less than the rated load of the grid-connected operating unit; if so, judging that the actual load value is within the load adjustable range, otherwise judging that the primary frequency regulation capacity of the current grid-connected operating unit is limited, and issuing a limited alarm; summing the primary frequency regulation load compensation amount of each grid-connected operating unit, and calculating the total primary frequency regulation compensation load value of the power grid; determining the power grid removal strategy according to 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 technical solution of the invention in the embodiments of the present application, the present application found that the above technology has at least the following technical problems: In the prior art, the operating states and load characteristics of different frequency modulation units vary greatly. Secondly, during the frequency modulation process, the high-power load generated by the frequency modulation unit causes the output deviation of the frequency modulation unit to fluctuate, resulting in a decrease in the accuracy of the deviation value obtained during the frequency modulation process of the frequency modulation unit in the box-type energy storage power supply cabinet. There is a problem of inaccurate frequency modulation amount obtained during the frequency modulation process of the frequency modulation unit. Summary of the invention

[0007] The embodiment of the present application solves the problem of inaccurate frequency modulation quantity acquisition of the frequency modulation unit during the frequency modulation process in the prior art by providing a frequency modulation monitoring system and method for a box-type energy storage power supply cabinet, thereby improving the frequency modulation accuracy of the frequency modulation unit during the frequency modulation monitoring process.

[0008] The embodiment of the present application provides a frequency modulation 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 modulation control module; wherein the data acquisition module is used to obtain the impact load data when the frequency modulation unit is connected to the power grid, and at the same time obtain the response load data of the frequency modulation unit after the frequency modulation unit is connected to the power grid in real time and monitor the output power grid frequency of the frequency modulation unit in real time within a preset time period, and the frequency modulation 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 power grid frequency with the power grid frequency setting value 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, the output power grid frequency of the frequency modulation unit within the preset time period will continue to be monitored, otherwise, an audible and visual alarm will be issued and corresponding measures will be taken. The solution is to perform frequency monitoring 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 setting value, and the sound and light alarm is used to notify the operation and maintenance personnel of the abnormal information of the output grid frequency; the frequency modulation control module is used to adjust the control parameters of the frequency modulation unit according to the abnormal information of the output grid frequency and perform secondary frequency modulation, and at the same time, perform deviation compensation on the frequency modulation unit according to 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 indicates reducing the frequency deviation value within a preset time period, and the deviation compensation indicates using the frequency deviation value as the compensation value of the frequency modulation unit to ensure that the output grid frequency is restored to the grid frequency setting value within a preset time period, and the secondary frequency modulation and deviation compensation cooperate with each other.

[0009] Furthermore, the frequency modulation analysis signal group is the sum of a low-frequency signal, a high-frequency signal and an ampere-frequency signal, the low-frequency signal is a signal generated when the output grid frequency is less than the grid frequency setting value, the high-frequency signal is a signal generated when the output grid frequency is greater than the grid frequency setting value, the ampere-frequency signal is a signal generated when the output grid frequency is equal to the grid frequency preset value, and the frequency modulation monitoring operation includes parameter processing and ring modulation processing.

[0010] Further, the specific operation flow of the parameter processing is: identify the frequency modulation analysis signal group, and when a low-frequency signal is identified, perform low-frequency parameter processing, and the low-frequency parameter processing is used to reduce the proportion of low-frequency signals in the frequency modulation analysis signal group; when a high-frequency signal is identified, perform high-frequency parameter processing, and the high-frequency parameter processing is used to reduce the proportion of high-frequency signals in the frequency modulation analysis signal group; when an ampere frequency signal is identified, continue to monitor the output grid frequency of the frequency modulation unit within a preset time period; The temperature control parameter and the ambient temperature control parameter are obtained, wherein the temperature control parameter is the surface temperature of the frequency modulation unit within a preset time period, and the ambient temperature control parameter is the frequency modulation environment temperature of the frequency modulation unit within a preset time period.

[0011] Furthermore, the specific operation flow of the ring adjustment processing is: the temperature adjustment data is evaluated in combination with the obtained frequency modulation response evaluation index to obtain the ring adjustment evaluation index, the temperature adjustment data is obtained according to the temperature adjustment parameters and the ring temperature adjustment parameters obtained within a preset time period, the temperature adjustment data includes the temperature parameter difference, the temperature parameter ratio, the temperature parameter mean and the temperature parameter mean difference, the ring adjustment evaluation index is used to evaluate the influence of the temperature condition of the frequency modulation environment of the frequency modulation unit on the frequency modulation performance; the temperature adjustment data is temperature-adjusted according to the obtained ring adjustment evaluation index until the temperature adjustment parameter is equal to the corresponding ring temperature adjustment parameter, the temperature adjustment means adjusting the frequency modulation environment temperature of the frequency modulation unit by the temperature parameter difference to reduce the influence of the temperature parameter difference on the frequency modulation of the frequency modulation unit; the calculation formula of the ring adjustment evaluation index is: ; In the formula, m is the number of the frequency-modulating unit, , M is the total number of frequency-regulated units, n is the number of the preset time period, , N is the total number of preset time periods, e is a natural constant, It represents the environmental regulation evaluation index of the mth frequency regulation unit in the nth preset time period. It represents the frequency regulation response evaluation index of the mth frequency regulation unit in the nth preset time period, It indicates the temperature parameter difference of the mth frequency-regulated unit in the nth preset time period. It represents the temperature parameter ratio of the mth frequency-regulated unit in the nth preset time period. It represents the mean value of the temperature parameter of the mth frequency-regulated unit in the nth preset time period. It represents the average difference of temperature parameters of the mth frequency-regulated unit in the nth preset time period.

[0012] Furthermore, the control parameters of the frequency modulation unit are adjusted according to the abnormal information of the output grid frequency, and then the frequency modulation monitoring index is obtained according to the waveform fluctuation of the control parameter on the oscilloscope, and the frequency modulation monitoring index is used to measure the frequency modulation effect of the frequency modulation unit within a preset time period. The specific steps of obtaining the frequency modulation monitoring index are: at the preset current measurement point and the preset voltage measurement point, the current peak floating value and the voltage peak floating value of the current waveform and the voltage waveform within the preset measurement period are recorded in real time by an oscilloscope and normalized, and the preset measurement period includes a current peak and a voltage peak; the frequency modulation speed of the frequency modulation unit within the preset time period is monitored in real time by a speed sensor to obtain the frequency modulation rate and normalize it, and a preset environmental regulation evaluation index correction factor is obtained from a preset database and the normalized frequency modulation rate, current peak floating value and voltage peak floating value are combined to obtain the frequency modulation monitoring index, and the frequency modulation rate is the ratio of the frequency modulation speed to the preset time period.

[0013] Furthermore, the frequency modulation monitoring index is calculated by the following formula: ; Where h is the number of the preset current measurement point, , H is the total number of preset current measurement points, q is the number of preset voltage measurement points, , Q is the total number of preset voltage measurement points, It indicates the frequency regulation monitoring index of the mth frequency regulation unit in the nth preset time period. represents the correction factor of environmental assessment indicators, Indicates the frequency modulation rate of the mth frequency modulation unit in the nth preset time period, It indicates the current peak floating value of the mth frequency-regulated unit at the hth preset current measurement point in the nth preset time period. It represents the voltage peak floating value of the qth preset voltage measurement point of the mth frequency modulation unit in the nth preset time period.

[0014] Further, the deviation compensation of the frequency regulation unit is performed according to the obtained frequency deviation value, and then the frequency regulation load compensation amount is used as the compensation value of the frequency regulation unit, and the frequency regulation load compensation amount includes a primary frequency regulation load compensation amount and a secondary frequency regulation load compensation amount; the frequency regulation load compensation amount is used as the compensation value of the frequency regulation unit, and then the deviation compensation impact evaluation value is obtained by combining the obtained frequency regulation load compensation amount, the frequency deviation value and the frequency regulation monitoring index, and the deviation compensation impact evaluation value is used to comprehensively evaluate the influence of the deviation compensation on the frequency stability of the output power grid, and the deviation compensation impact evaluation value is calculated by the following formula: ; ; ; In the formula, It represents the deviation compensation impact assessment value of the mth frequency regulating unit in the nth preset time period, It indicates the frequency regulation load compensation of the mth frequency regulation unit in the nth preset time period. It indicates the secondary frequency regulation load compensation amount of the mth frequency regulation unit in the nth preset time period. Indicates the frequency deviation value of the mth frequency-regulated unit in the nth preset time period, It represents the rated load of the mth frequency regulating unit in a frequency regulating process. It represents the rated speed of the mth frequency regulating unit in a frequency regulating process. Indicates the speed inequality of the frequency modulation unit during a frequency modulation process. Indicates the primary frequency modulation dead zone, Indicates the rated frequency of the frequency-modulating unit during a frequency modulation process. represents the rated load of the mth frequency regulating unit during the secondary frequency regulation process, It represents the rated speed of the mth frequency regulating unit during the secondary frequency regulating process. Indicates the speed inequality of the frequency-modulating unit during the secondary frequency modulation process. Indicates the secondary frequency modulation dead zone, Indicates the rated frequency of the frequency regulating unit during the secondary frequency regulation process.

[0015] Furthermore, the specific process of performing deviation compensation for the frequency modulation unit according to the acquired frequency deviation value is as follows: adjusting the output grid frequency within a preset time period according to the received adjustment amount to obtain a first frequency deviation value, the adjustment amount including the frequency deviation value and the frequency modulation load compensation amount, the first frequency deviation value being the deviation value between the output grid frequency after adjustment within the preset time period and the grid frequency setting value; when the first frequency deviation value is 0, continuing to monitor the change of the output grid frequency of the frequency modulation unit within the preset time period, and when the first frequency deviation value is not 0, continuing to adjust the output grid frequency according to 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 being the deviation value between the output grid frequency after adjustment according to the first frequency deviation value and the grid frequency setting value.

[0016] The embodiment of the present application provides a frequency regulation monitoring system using any one of the box-type energy storage power supply cabinets, including the following steps: S1, obtaining impact load data when the frequency regulation unit is connected to the power grid, and at the same time obtaining the response load data of the frequency regulation unit after the frequency regulation unit is connected to the power grid in real time and monitoring the output power grid frequency of the frequency regulation unit in real time within a preset time period, 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 setting value to obtain a frequency deviation value and judging whether the obtained frequency deviation value is within a preset safety threshold range, and if the obtained frequency deviation value is within the preset safety threshold range, continuing to monitor the output power grid frequency of the frequency regulation unit within the preset time period, otherwise sounding and visually alarming and taking corresponding solutions Solution measures are taken, and at the same time, frequency monitoring operations are 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 setting value, and the sound and light alarm is used to notify the operation and maintenance personnel of the abnormal information of the output grid frequency; S3, adjust the control parameters of the frequency modulation unit according to the abnormal information of the output grid frequency and perform secondary frequency modulation, and at the same time, perform deviation compensation on the frequency modulation unit according to the obtained frequency deviation value until the frequency deviation value is 0, the control parameters include current, voltage and frequency modulation rate, the secondary frequency modulation represents reducing the frequency deviation value within a preset time period, and the deviation compensation represents using the frequency deviation value as the compensation value of the frequency modulation unit to ensure that the output grid frequency is restored to the grid frequency setting value within a preset time period.

[0017] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages: 1. By acquiring the impact load data when the frequency modulation unit is connected to the power grid and the response load data after the connection to the power grid and monitoring the output power grid frequency of the frequency modulation unit in a preset time period in real time, the output power grid frequency is then compared with the power grid frequency setting value to obtain the frequency deviation value, and then the control parameters of the frequency modulation unit are adjusted according to the abnormal information of the output power grid frequency and secondary frequency modulation is performed. At the same time, the deviation of the frequency modulation unit is compensated according to the obtained frequency deviation value until the frequency deviation value is 0, thereby improving the accuracy and reliability of secondary frequency modulation, and then improving the frequency modulation accuracy of the frequency modulation unit during the frequency modulation monitoring process, and effectively solving the problem of inaccurate frequency modulation amount acquisition of the frequency modulation unit during the frequency modulation process in the prior art.

[0018] 2. The instantaneous load waveform generated when the frequency modulation unit is connected to the power grid is obtained through an oscilloscope to obtain the load impact assessment value, and then the changes in the response load data after the frequency modulation unit is connected to the power grid are monitored in real time to obtain the load response assessment value. Finally, the obtained load impact assessment value and load response assessment value are combined to obtain the frequency modulation response assessment index, thereby achieving more accurate acquisition of the load impact assessment value and the load response assessment value, and then achieving improved accuracy and reliability in obtaining the frequency modulation response assessment index.

[0019] 3. According to the received adjustment amount, the output grid frequency is adjusted within the preset time period to obtain a first frequency deviation value. When the first frequency deviation value is 0, the change of the output grid frequency of the frequency modulation unit within the preset time period is continuously monitored. When the first frequency deviation value is not 0, the output grid frequency is continuously adjusted according to the first frequency deviation value to obtain a second frequency deviation value until the second frequency deviation value is 0, thereby achieving more accurate acquisition of the first frequency deviation value, and further achieving improved accuracy and reliability of deviation compensation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A structural schematic diagram of a frequency modulation monitoring system for a box-type energy storage power supply cabinet provided in an embodiment of the present application; Figure 2 A three-dimensional coordinate analysis diagram of the frequency modulation response evaluation index provided in an embodiment of the present application; Figure 3 A flow chart of a frequency modulation monitoring method for a box-type energy storage power supply cabinet provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] The embodiment of the present application solves the problem of inaccurate frequency modulation amount acquisition of the frequency modulation unit in the frequency modulation process in the prior art by providing a frequency modulation monitoring system and method for a box-type energy storage power supply cabinet. The impact load data of the frequency modulation unit when connected to the power grid is acquired through a data acquisition module. At the same time, the response load data of the frequency modulation unit after the frequency modulation unit is connected to the power grid is acquired in real time and the output power grid frequency of the frequency modulation unit within a preset time period is monitored in real time. Then, the output power grid frequency is compared with the power grid frequency setting value through an audible and visual alarm module to obtain a frequency deviation value and determine whether the acquired frequency deviation value is within a preset safety threshold range. If the acquired frequency deviation value is within the preset safety threshold range, the output power grid frequency of the frequency modulation unit within the preset time period is continuously monitored. Otherwise, an audible and visual alarm is issued and corresponding solutions are taken. At the same time, the frequency modulation monitoring operation is performed on the frequency modulation unit according to the frequency modulation analysis signal group. Then, the control parameters of the frequency modulation unit are adjusted according to the abnormal information of the output power grid frequency through the frequency modulation control module and secondary frequency modulation is performed. At the same time, the deviation compensation is performed on the frequency modulation unit according to the acquired frequency deviation value until the frequency deviation value is 0, thereby improving the frequency modulation accuracy of the frequency modulation unit during the frequency modulation monitoring process.

[0022] The technical solution in the embodiment of the present application is to solve the problem of inaccurate frequency modulation amount acquisition during the frequency modulation process of the above-mentioned frequency modulation unit. The overall idea is as follows: By acquiring the impact load data when the frequency modulation unit is connected to the grid and the response load data after being connected to the grid and monitoring the output grid frequency of the frequency modulation unit in real time within a preset time period, the output grid frequency is then compared with the grid frequency setting value to obtain the frequency deviation value, and then the control parameters of the frequency modulation unit are adjusted according to the abnormal information of the output grid frequency and secondary frequency modulation is performed. At the same time, the frequency modulation unit is compensated for the deviation according to the obtained frequency deviation value until the frequency deviation value is 0, thereby achieving the effect of improving the frequency modulation accuracy of the frequency modulation unit during the frequency modulation monitoring process.

[0023] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0024] like Figure 1As shown, it is a structural schematic diagram of a frequency modulation monitoring system of a box-type energy storage power supply cabinet provided in an embodiment of the present application. A frequency modulation monitoring system of a box-type energy storage power supply cabinet provided in an embodiment of the present application includes: a data acquisition module, an audible and visual alarm module and a frequency modulation control module; wherein the data acquisition module is used to obtain the impact load data when the frequency modulation unit is connected to the power grid, and at the same time, obtain the response load data of the frequency modulation unit after the frequency modulation unit is connected to the power grid in real time and monitor the output power grid frequency of the frequency modulation unit within a preset time period in real time, the frequency modulation unit is connected to the transmission interface of the box-type energy storage power supply cabinet, the response load data is used to reflect the response capability of the frequency modulation unit to the change of the power grid load, and the impact load data is used to reflect the instantaneous load waveform of the frequency modulation unit when it is connected to the power grid; the audible and visual alarm module is used to compare the output power grid frequency with the power grid frequency setting value 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, the output of the frequency modulation unit within the preset time period is continuously monitored. The output grid frequency is detected, otherwise an audible and visual alarm is issued and corresponding solutions are taken. At the same time, the frequency modulation unit is monitored according to the frequency modulation analysis signal group. The grid frequency setting value is usually set by the 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 setting value. The audible and visual alarm is used to notify the operation and maintenance personnel of the abnormal information of the output grid frequency. The abnormal information is the location, time and type of the abnormal output grid frequency. The frequency modulation control module is used to adjust the control parameters of the frequency modulation unit according to the abnormal information of the output grid frequency and perform secondary frequency modulation. At the same time, the frequency modulation unit is compensated for the deviation according to the obtained frequency deviation value until the frequency deviation value is 0. The control parameters include current, voltage and frequency modulation rate. Secondary frequency modulation 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 modulation unit to ensure that the output grid frequency is restored to the grid frequency setting value within the preset time period. Secondary frequency modulation and deviation compensation work together.

[0025] In this embodiment, the frequency deviation value is the absolute value of the difference between the output grid frequency and the grid frequency setting value at each moment in the preset time period, the impact load data is the instantaneous change of the grid load when the frequency modulation unit is just connected to the grid, and the instantaneous peak of the impact load is displayed on the oscilloscope; the response load data includes the response time and the adjustment amount, wherein the response time represents the time required from the grid load change to the frequency modulation unit starting to respond and adjust its output power, and the adjustment amount is the output power amount adjusted by the frequency modulation unit in response to the grid load change. The response load data can accurately evaluate the adjustment effect of the frequency modulation unit in the preset time period; 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 it is judged that the grid operation state is abnormal, the sound and light alarm module immediately starts the sound and light alarm device, emits a strong sound and light signal to remind the operator to pay attention, and at the same time, according to the corresponding response measures (such as starting the backup power supply, switching the grid load) to restore the stable operation of the grid as soon as possible, it is helpful to output the grid frequency of the frequency modulation unit stably, and improve the frequency modulation accuracy of the frequency modulation unit during the frequency modulation monitoring process.

[0026] Furthermore, 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 obtain the instantaneous load waveform generated when the frequency modulation unit is connected to the power grid through an oscilloscope to obtain a load impact evaluation value, and the load impact evaluation value is used to reflect the degree of influence of the frequency modulation unit on the stability of the power grid at the moment of connecting to the power grid; the response load monitoring unit is used to monitor the changes in the response load waveform of the frequency modulation unit after connecting to the power grid in real time to obtain a load response evaluation value, and the load response evaluation value is used to reflect the response ability of the frequency modulation unit to the change of the power grid load within a preset time period; the frequency modulation response evaluation index acquisition unit is used to combine the acquired load impact evaluation value and load response evaluation value to obtain the frequency modulation response evaluation index, and the frequency modulation response evaluation index is used to evaluate the frequency modulation performance of the frequency modulation unit within a preset time period.

[0027] In this embodiment, the difference between the instantaneous waveform peak value displayed on the oscilloscope and the reference value is usually used as the load impact assessment value, wherein 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 usually obtained by the oscillation value of the response load waveform displayed when the oscilloscope is connected to the grid power supply within a preset time period, wherein 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 value and the valley value of the response load waveform within the preset time period; through the real-time measurement of the oscilloscope, the load impact assessment value and the 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 evaluation indicators can also guide the optimal design and operation and maintenance of the frequency modulation unit, thereby realizing more accurate acquisition of frequency modulation response evaluation indicators.

[0028] Specifically, the frequency modulation response evaluation index is calculated by the following formula: ; In the formula, m is the number of the frequency-modulating unit, , M is the total number of frequency-regulated units, n is the number of the preset time period, , N is the total number of preset time periods, e is a natural constant, It represents the frequency regulation response evaluation index of the mth frequency regulation unit in the nth preset time period, It represents the load impact evaluation value of the mth frequency regulating unit in the nth preset time period. It represents the load response evaluation value of the mth frequency regulating unit in the nth preset time period.

[0029] Specifically, Figure 2 As shown, it is a three-dimensional coordinate analysis diagram of the frequency regulation response evaluation index provided in the embodiment of the present application. It can be seen from the figure that the frequency regulation response evaluation index decreases with the increase of the load impact evaluation value, and increases with the increase of the load response evaluation value. 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 being connected to the power grid is more drastic. This drastic load change may require the frequency regulation unit to adjust its output power more quickly to maintain the stability of the power grid, thereby indirectly affecting the load response evaluation value.

[0030] Specifically, if the frequency-modulating unit can respond to such load shock quickly and accurately, then the load response evaluation value will be relatively high, which means that the frequency-modulating unit can effectively adjust its output power when facing load shock. On the contrary, if the response is slow or inaccurate, the load response evaluation value will be low, which means that the frequency-modulating unit cannot respond to the load shock in time, resulting in the load fluctuation of the power grid cannot be effectively controlled. By comprehensively considering the impact between the load shock evaluation value and the load response evaluation value, it is helpful to more accurately evaluate the performance of the frequency-modulating unit, and improve the accuracy and reliability of the frequency response evaluation index, thereby improving the frequency modulation accuracy of the frequency-modulating unit during the frequency modulation monitoring process, and effectively solving the problem of inaccurate frequency modulation amount acquisition of the frequency-modulating unit during the frequency modulation process in the prior art.

[0031] Furthermore, the frequency modulation analysis signal group includes a low-frequency signal, a high-frequency signal and an ampere-frequency signal. The low-frequency signal is a signal generated when the output grid frequency is less than the grid frequency setting value, the high-frequency signal is a signal generated when the output grid frequency is greater than the grid frequency setting value, and the ampere-frequency signal is a signal generated when the output grid frequency is equal to the grid frequency preset value. The frequency modulation monitoring operation includes parameter processing and ring modulation processing.

[0032] In this embodiment, when the output grid frequency is less than the grid frequency setting value, a low-frequency signal is generated, which reflects the low grid frequency state; on the contrary, when the output grid frequency is greater than the grid frequency setting value, a high-frequency signal is generated, which indicates that the grid frequency is 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 in a stable state and the frequency modulation unit does not need to make additional adjustments; the frequency modulation analysis signal group and the frequency modulation monitoring operation together constitute the main link of the frequency modulation unit, which realizes the improvement of the stability of the output grid frequency regulation by real-time acquisition of the output grid frequency and generating the corresponding control signal accordingly.

[0033] Furthermore, the specific operation flow of parameter processing is as follows: the frequency modulation analysis signal group is identified, and when a low-frequency signal is identified, low-frequency parameter processing is performed, and the low-frequency parameter processing is used 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, and the high-frequency parameter processing is used to reduce the proportion of high-frequency signals in the frequency modulation analysis signal group; when an ampere signal is identified, the output grid frequency of the frequency modulation unit within a preset time period continues to be monitored; the temperature control parameters and the ambient temperature control parameters are obtained, 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 environment temperature of the frequency modulation unit within a preset time period.

[0034] In this embodiment, the surface temperature of the frequency modulation unit within a preset time period (i.e., the temperature control parameter) and the temperature of the frequency modulation environment in which the frequency modulation unit is located (i.e., the ambient temperature control parameter) are usually measured in real time by a temperature sensor, wherein the frequency modulation environment temperature is usually the temperature of the cooling device in the frequency modulation unit; it should be noted that in the parameter processing process, the maximum output power limit of the frequency modulation unit is usually also required to be considered to avoid overload, wherein the maximum output power limit is usually represented by the sum and average of the maximum values ​​of the historical output power in the preset database within the preset time period, thereby improving the accuracy and efficiency of parameter processing.

[0035] Furthermore, the specific operation flow of the environmental regulation processing is as follows: the temperature regulation data is evaluated in combination with the obtained frequency regulation response evaluation index to obtain the environmental regulation evaluation index, the temperature regulation data is obtained according to the temperature regulation parameters and environmental temperature regulation parameters obtained within a preset time period, the temperature regulation data includes the temperature parameter difference, the temperature parameter ratio, the temperature parameter mean and the temperature parameter mean difference, and the environmental regulation evaluation index is used to evaluate the influence of the temperature conditions of the frequency regulation environment of the frequency regulation unit on the frequency regulation performance; the temperature regulation data is temperature-regulated according to the obtained environmental regulation evaluation index until the temperature regulation parameter is equal to the corresponding environmental temperature regulation parameter, and the temperature regulation means adjusting the frequency regulation environment temperature of the frequency regulation unit by the temperature parameter difference to reduce the influence of the temperature parameter difference on the frequency regulation of the frequency regulation unit; the calculation formula of the environmental regulation evaluation index is: ; In the formula, m is the number of the frequency-modulating unit, , M is the total number of frequency-regulated units, n is the number of the preset time period, , N is the total number of preset time periods, e is a natural constant, It represents the environmental regulation evaluation index of the mth frequency regulation unit in the nth preset time period. It represents the frequency regulation response evaluation index of the mth frequency regulation unit in the nth preset time period, It indicates the temperature parameter difference of the mth frequency-regulated unit in the nth preset time period. It represents the temperature parameter ratio of the mth frequency-regulated unit in the nth preset time period. It represents the mean value of the temperature parameter of the mth frequency-regulated unit in the nth preset time period. It represents the average difference of temperature parameters of the mth frequency-regulated unit in the nth preset time period.

[0036] In this embodiment, the temperature parameter difference is the difference between the temperature control parameter and the ring temperature control parameter, which is helpful to understand the heat dissipation of the frequency modulation unit. The temperature parameter ratio is the ratio of the temperature control parameter to the ring temperature control parameter. The temperature parameter mean is the average value of the temperature parameter difference. The temperature parameter mean difference is the difference between the temperature parameter difference and the temperature parameter mean. When the difference between the temperature control parameter and the ring temperature control parameter is 0, that is, , indicating that the frequency modulation ambient temperature has no direct effect on the frequency modulation performance of the frequency modulation unit (or the effect is negligible). At this time, the corresponding , .

[0037] It should be understood that the temperature parameter difference, temperature parameter ratio, temperature parameter mean and temperature parameter average difference all have corresponding application scenarios in actual applications, and different application scenarios correspond to different temperature parameters. For example, in the scenario where the heat dissipation performance of power equipment under dynamic load changes needs to be analyzed, the temperature parameter ratio and the temperature parameter average are known. At this time, it is only necessary to obtain the temperature parameter average difference through the difference between the temperature parameter difference and the temperature parameter mean, which is used to reflect whether the heat dissipation system of the power equipment can quickly and stably adjust the temperature when responding to load fluctuations, thereby maintaining the normal operation of the power equipment.

[0038] The frequency modulation response evaluation index also indirectly affects the value of the temperature parameter difference. For example, if the response time of the frequency modulation unit is very short, it can adjust the output power faster to cope with the change of the grid frequency, which usually reduces the temperature change inside the unit caused by the grid frequency fluctuation, thereby affecting the temperature parameter difference. By considering the impact of the frequency modulation response evaluation index on the temperature parameter difference, it helps to reduce the error of the frequency modulation unit during the frequency modulation process, improve the efficiency of the grid operation, and achieve the improvement of the accuracy and reliability of the environmental regulation evaluation index acquisition, thereby achieving the improvement of the accuracy of the deviation compensation value acquisition of the frequency modulation unit during the frequency modulation process, and effectively solves the problem of inaccurate frequency modulation amount acquisition of the frequency modulation unit during the frequency modulation process in the prior art.

[0039] Furthermore, the control parameters of the frequency modulation unit are adjusted according to the abnormal information of the output grid frequency, and then the frequency modulation monitoring index is obtained according to the waveform fluctuation of the control parameter on the oscilloscope. The frequency modulation monitoring index is 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 index are: at the preset current measurement point and the preset voltage measurement point, the current peak floating value and the voltage peak floating value of the current waveform and the voltage waveform within the preset measurement period are recorded in real time by an oscilloscope and normalized. The preset measurement period includes a current peak and a voltage peak. The current peak floating value is the absolute value of the difference between the current peak within the preset measurement period and the current peak within the adjacent preset measurement period, and the voltage peak floating value is the absolute value of the difference between the voltage peak within the preset measurement period and the voltage peak within the adjacent preset measurement period; the frequency modulation speed of the frequency modulation unit within the preset time period is monitored in real time by a speed sensor to obtain the frequency modulation rate and normalize it, the preset environmental regulation evaluation index correction factor is obtained from the preset database, and the frequency modulation monitoring index is obtained by combining the normalized frequency modulation rate, current peak floating value and voltage peak floating value. The frequency modulation rate is the ratio of the frequency modulation speed to the preset time period.

[0040] In this embodiment, it should be noted that in this embodiment, 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 the preset time period, the preset current measurement point and the preset voltage measurement point are set by the preset personnel, wherein the preset current measurement point is usually the input end of the current sensor, and the preset voltage measurement point is usually the power output end or the load ends of the frequency modulation unit, and normalization is performed to make the data at different measurement points and in different time periods comparable; when the voltage peak floating value and the current peak floating value are equal to 0, it indicates that the frequency modulation stability of the frequency modulation unit in adjacent time periods is improved, wherein the voltage peak and the current peak are the peaks of the current waveform when the voltage waveform in the oscilloscope is the highest (i.e., the maximum value); it should be noted that during the frequency modulation process of the frequency modulation unit, the temperature of the oscilloscope needs to be monitored in real time to avoid overheating and affecting the measurement accuracy of the voltage peak and the current peak, thereby achieving more accurate acquisition of the frequency modulation monitoring indicators.

[0041] Furthermore, the frequency modulation monitoring index is calculated by the following formula: ; Where h is the number of the preset current measurement point, , H is the total number of preset current measurement points, q is the number of preset voltage measurement points, , Q is the total number of preset voltage measurement points, It indicates the frequency regulation monitoring index of the mth frequency regulation unit in the nth preset time period. represents the correction factor of environmental assessment indicators, Indicates the frequency modulation rate of the mth frequency modulation unit in the nth preset time period, It indicates the current peak floating value of the mth frequency-regulated unit at the hth preset current measurement point in the nth preset time period. It represents the voltage peak floating value of the qth preset voltage measurement point of the mth frequency modulation unit in the nth preset time period.

[0042] In this embodiment, in order to simplify the analysis, we define , , , where It represents the environmental regulation evaluation index coefficient of the mth frequency regulation unit in the nth preset time period, It indicates the average floating value of the current peak value of the mth frequency-regulated unit in the nth preset time period. It represents the average floating value of the voltage peak value of the mth frequency regulation unit in the nth preset time period. The simplified calculation formula of the frequency regulation monitoring index is: ,The statistical table of changes in frequency modulation monitoring indicators is shown in Table 1: Table 1 Statistics of changes in frequency modulation monitoring indicators It should be understood that the frequency modulation monitoring index increases with the increase of the ring-modulation evaluation index coefficient and the frequency modulation rate, and decreases with the increase of the current peak average floating value and the voltage peak average floating value, and the ring-modulation evaluation index correction factor is obtained from the preset database. In a specific embodiment, a mapping set of the ring-modulation evaluation index and its corresponding correction factor is constructed according to the relationship between the historical ring-modulation evaluation index and the frequency modulation monitoring index in the preset database, and the real-time ring-modulation evaluation index is input into the mapping set to obtain the corresponding ring-modulation evaluation index correction factor.

[0043] In the calculation formula of frequency regulation monitoring indicators, the frequency regulation rate also indirectly affects the values ​​of the average floating value of the voltage peak and the average floating value of the current peak. For example, when the frequency regulation rate increases, the generator needs to increase or decrease its output power to match the change in system frequency. This rapid power adjustment may cause instantaneous fluctuations in the voltage and current inside the generator. The frequency regulation rate indirectly affects the values ​​of the average floating value of the voltage peak and the average floating value of the current peak by affecting the adjustment of the output grid frequency of the frequency regulation unit, thereby improving the accuracy and stability of frequency regulation monitoring.

[0044] Similarly, the environmental regulation evaluation index coefficient also indirectly affects the values ​​of the average floating value of the voltage peak and the average floating value of the current peak. For example, during the environmental regulation process, the change of the grid impedance will directly affect the distribution and loss of the current in the grid load. If the impedance increases, the current will receive a voltage drop during the transmission process, resulting in a decrease in the voltage peak, and then a decrease in the average floating value of the voltage. At the same time, the current will also increase when passing through the high impedance area, thereby increasing the average floating value of the current peak. Conversely, a decrease in impedance will have the opposite effect.

[0045] By comprehensively considering the indirect impact of the frequency regulation rate and the ring regulation evaluation index coefficient on the average floating value of the voltage peak and the average floating value of the current peak, the value of the frequency regulation monitoring index is affected, and the response capability of the power grid when facing disturbances is indirectly adjusted, which helps to improve the overall stability and reliability of the power grid, and improves the accuracy and reliability of the frequency regulation monitoring index acquisition, thereby achieving an improvement in the frequency regulation accuracy of the frequency regulation unit during the frequency regulation monitoring process, and effectively solves the problem of inaccurate frequency regulation acquisition of the frequency regulation unit during the frequency regulation process in the prior art.

[0046] Furthermore, the frequency regulation unit is subjected to deviation compensation according to the obtained frequency deviation value, and then the frequency regulation load compensation amount is used as the compensation value of the frequency regulation unit. The frequency regulation load compensation amount includes a primary frequency regulation load compensation amount and a secondary frequency regulation load compensation amount. The primary frequency regulation load compensation amount is the instantaneous deviation amount when the output grid frequency changes instantaneously during the primary frequency regulation process, and the secondary frequency regulation load compensation amount is the adjustment deviation amount of the output grid frequency according to the instantaneous deviation amount generated by the primary frequency regulation; the frequency regulation load compensation amount is used as the compensation value of the frequency regulation unit, and then the deviation compensation impact evaluation value is obtained by combining the obtained frequency regulation load compensation amount, the frequency deviation value and the frequency regulation monitoring index. The deviation compensation impact evaluation value is used to comprehensively evaluate the influence of the deviation compensation on the stability of the output grid frequency. The deviation compensation impact evaluation value is calculated by the following formula: ; ; ; In the formula, It represents the deviation compensation impact assessment value of the mth frequency regulating unit in the nth preset time period, It indicates the frequency regulation load compensation of the mth frequency regulation unit in the nth preset time period. It indicates the secondary frequency regulation load compensation amount of the mth frequency regulation unit in the nth preset time period. Indicates the frequency deviation value of the mth frequency-regulated unit in the nth preset time period, It represents the rated load of the mth frequency regulating unit in a frequency regulating process. It represents the rated speed of the mth frequency regulating unit in a frequency regulating process. Indicates the speed inequality of the frequency modulation unit during a frequency modulation process. Indicates the primary frequency modulation dead zone, Indicates the rated frequency of the frequency-modulating unit during a frequency modulation process. represents the rated load of the mth frequency regulating unit during the secondary frequency regulation process, It represents the rated speed of the mth frequency regulating unit during the secondary frequency regulating process. Indicates the speed inequality of the frequency-modulating unit during the secondary frequency modulation process. Indicates the secondary frequency modulation dead zone, Indicates the rated frequency of the frequency-regulating unit during the secondary frequency regulation process. , , , .

[0047] In this embodiment, in addition to considering the deviation compensation of the frequency deviation value for the frequency modulation unit, the deviation compensation of the frequency modulation load compensation for the frequency modulation unit is also considered, which 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 modulation load compensation amount usually represents the load amount that needs to be increased or decreased in response to the instantaneous change of the output grid frequency, and this instantaneous deviation is calculated based on the difference between the actual value of the output grid frequency and the grid frequency setting value; since the load compensation amount generated in the primary frequency modulation process cannot completely eliminate the output frequency deviation, secondary frequency modulation is required, wherein the secondary frequency modulation load compensation amount is calculated based on the deviation amount that still exists in the output grid frequency after the primary frequency modulation, which is usually the difference between the grid frequency setting value and the output grid frequency after the primary frequency modulation.

[0048] The deviation compensation impact assessment value decreases with the increase of the frequency regulation monitoring index, and increases with the increase of the frequency regulation load compensation amount and the frequency deviation value. The rated load of the frequency regulation unit in the primary frequency regulation is usually represented by the sum and average of the historical primary frequency regulation rated loads in the preset database, and the rated load of the frequency regulation unit in the secondary frequency regulation is usually represented by the sum and average of the historical secondary frequency regulation rated loads in the preset database; the rated speed of the frequency regulation unit in the primary frequency regulation is usually represented by the sum and average of the historical primary frequency regulation rated speeds in the preset database, and the rated speed of the frequency regulation unit in the secondary frequency regulation is usually represented by the sum and average of the historical secondary frequency regulation rated speeds in the preset database; the rated frequency of the frequency regulation unit in the primary frequency regulation is usually represented by the sum and average of the historical primary frequency regulation rated frequencies in the preset database, and the rated frequency of the frequency regulation unit in the secondary frequency regulation is usually represented by the sum and average of the historical secondary frequency regulation rated frequencies in the preset database.

[0049] The primary frequency regulation dead zone is usually the minimum value of the grid frequency allowed to be output by the frequency modulation unit during the primary frequency regulation process, and is usually expressed by summing and averaging the historical output grid frequency minimum values ​​in the preset primary frequency regulation database; the secondary frequency regulation dead zone is usually the minimum value of the grid frequency allowed to be output by the frequency modulation unit during the secondary frequency regulation process, and is usually expressed by summing and averaging the historical output grid frequency minimum values ​​in the preset secondary frequency regulation database; the speed inequality of the frequency modulation unit during the primary frequency regulation process is used to reflect the sensitivity of the speed change of the frequency modulation unit when the grid load changes during the primary frequency regulation process, and is usually set by the preset personnel after summing and averaging the historical speed inequality in the preset primary frequency regulation database; the speed inequality of the frequency modulation unit during the secondary frequency regulation process is used to reflect the sensitivity of the speed change of the frequency modulation unit when the grid load changes during the secondary frequency regulation process, and is usually expressed by summing and averaging the historical speed inequality in the preset secondary frequency regulation database.

[0050] 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 power grid frequency output. This method not only reflects the real-time changes in the output power grid frequency, but also effectively reduces the frequency deviation through the synergistic effect of primary frequency regulation and secondary frequency regulation. In addition, this embodiment also accurately calculates the rated load, rated speed and rated frequency of the frequency regulation unit through the historical data in the preset database. These parameters are crucial for evaluating the performance of the frequency regulation unit. At the same time, the primary frequency regulation dead zone and the secondary frequency regulation dead zone are set to ensure that the power grid frequency during the frequency regulation process will not be lower than the minimum allowable value, thereby achieving the improvement of the accuracy and reliability of the deviation compensation impact evaluation value acquisition, and then achieving the improvement of the frequency regulation accuracy of the frequency regulation unit during the frequency regulation monitoring process, and effectively solving the problem of inaccurate frequency regulation amount acquisition of the frequency regulation unit during the frequency regulation process in the prior art.

[0051] Furthermore, the specific process of performing deviation compensation for the frequency modulation unit according to the acquired frequency deviation value is as follows: adjusting the output grid frequency within a preset time period according to the received adjustment amount to obtain a first frequency deviation value, the adjustment amount including the frequency deviation value and the frequency modulation load compensation amount, the first frequency deviation value being the deviation value between the output grid frequency after adjustment within the preset time period and the grid frequency setting value; when the first frequency deviation value is 0, continuing to monitor the change of the output grid frequency of the frequency modulation unit within the preset time period, when the first frequency deviation value is not 0, continuing to adjust the output grid frequency according to 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 being the deviation value between the output grid frequency after adjustment according to the first frequency deviation value and the grid frequency setting value.

[0052] 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 modulation unit continues to monitor the change of the output grid frequency within the preset time period to prevent new deviations from occurring; when the first frequency deviation value is not 0, the output grid frequency continues to be adjusted according to the first frequency deviation value to further reduce the deviation; this cyclic adjustment process continues until the second frequency deviation value (i.e., the deviation value measured again after adjustment according to the first frequency deviation value) is 0, indicating that the deviation has been completely eliminated. Through the above-mentioned 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, thereby achieving an improvement in the accuracy of output grid frequency adjustment during the deviation compensation process.

[0053] like Figure 3As shown, it is a flow chart of a frequency regulation monitoring method of a box-type energy storage power supply cabinet provided in an embodiment of the present application. A frequency regulation monitoring method of a box-type energy storage power supply cabinet provided in an embodiment of the present application includes the following steps: S1, obtaining impact load data when the frequency modulation unit is connected to the power grid, and at the same time obtaining response load data of the frequency modulation unit after connecting to the power grid in real time and monitoring the output power grid frequency of the frequency modulation unit within a preset time period in real time. The frequency modulation unit is connected to the transmission interface of the box-type energy storage power supply cabinet. The response load data is used to reflect the response capability of the frequency modulation unit to the change of the power grid load, and the impact load data is used to reflect the instantaneous load waveform of the frequency modulation unit when it is connected to the power grid; S2, comparing the output power grid frequency with the power grid frequency setting value to obtain a frequency deviation value and judging 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, continue to monitor the output power grid frequency of the frequency modulation unit within the preset time period, otherwise, sound and light alarms are issued and Take corresponding solutions, and at the same time, perform frequency monitoring operations on the frequency modulation unit according to the frequency modulation analysis signal group. The grid frequency setting value is usually set by the 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 setting value. The sound and light alarm is used to notify the operation and maintenance personnel of the abnormal information of the output grid frequency. The abnormal information is the location, time and type of the abnormal output grid frequency; S3, adjust the control parameters of the frequency modulation unit according to the abnormal information of the output grid frequency and perform secondary frequency modulation. At the same time, according to the obtained frequency deviation value, the frequency modulation unit is compensated for the deviation until the frequency deviation value is 0. The control parameters include current, voltage and frequency modulation rate. Secondary frequency modulation 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 modulation unit to ensure that the output grid frequency is restored to the grid frequency setting value within the preset time period. Secondary frequency modulation and deviation compensation work together.

[0054] In this embodiment, secondary frequency regulation and deviation compensation work together. Secondary frequency regulation reduces the frequency deviation by adjusting control parameters, while deviation compensation directly compensates for the deviation value. The two work together to form a closed-loop control system that can respond to changes in 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 output grid frequency fluctuation recovery are improved.

[0055] To summarize, the embodiment of the present application obtains the impact load data when the frequency modulation unit is connected to the power grid and the response load data after the connection to the power grid and monitors the output power grid frequency of the frequency modulation unit in real time within a preset time period, and then compares the output power grid frequency with the power grid frequency setting value to obtain the frequency deviation value, and then adjusts the control parameters of the frequency modulation unit according to the abnormal information of the output power grid frequency and performs secondary frequency modulation, and at the same time, according to the obtained frequency deviation value, the deviation of the frequency modulation unit is compensated until the frequency deviation value is 0, thereby achieving improved accuracy and reliability of secondary frequency modulation, and further achieving improved frequency modulation accuracy of the frequency modulation unit during the frequency modulation monitoring process, effectively solving the problem of inaccurate frequency modulation amount acquisition of the frequency modulation unit during the frequency modulation process in the prior art.

[0056] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented 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.

[0057] The present invention is described with reference to flowcharts and / or block diagrams of systems, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0058] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0059] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0060] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0061] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A frequency modulation monitoring system for a box-type energy storage power supply cabinet, characterized in that: include: Data acquisition module, sound and light alarm module and frequency modulation control module; The data acquisition module is used to acquire the impact load data when the frequency modulation unit is connected to the power grid, and at the same time acquire the response load data after the frequency modulation unit is connected to the power grid in real time and monitor the output power grid frequency of the frequency modulation unit in a preset time period in real time. The frequency modulation unit is connected to the transmission interface of the box-type energy storage power supply cabinet; The sound and light alarm module is used to compare the output grid frequency with the grid frequency setting value 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, the output grid frequency of the frequency modulation unit will continue to be monitored within the preset time period. Otherwise, a sound and light alarm will be issued and corresponding solutions will be taken. At the same time, the frequency modulation monitoring operation of the frequency modulation unit will be performed 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 setting value. The sound and light alarm is used to notify the operation and maintenance personnel of abnormal information of the output grid frequency.

2. A frequency modulation monitoring system for a box-type energy storage power supply cabinet as claimed in claim 1, characterized in that: 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 obtain the instantaneous load waveform generated when the frequency modulation unit is connected to the power grid through an oscilloscope to obtain a load impact evaluation value, and the load impact evaluation value is used to reflect the impact of the frequency modulation unit on the stability of the power grid at the moment of connecting to the power grid; The response load monitoring unit is used to monitor the change of response load data after the frequency modulation unit is connected to the power grid in real time to obtain a load response evaluation value, which is used to reflect the response ability of the frequency modulation unit to the change of power grid load within a preset time period; The frequency modulation response evaluation index acquisition unit is used to obtain a frequency modulation response evaluation index by combining the acquired load impact evaluation value and load response evaluation value, and the frequency modulation response evaluation index is used to evaluate the frequency modulation performance of the frequency modulation unit within a preset time period.

3. The frequency modulation monitoring system of a box-type energy storage power supply cabinet as claimed in claim 1, characterized in that: The frequency modulation analysis signal group is the sum of the low frequency signal, the high frequency signal and the ampere frequency signal; The low-frequency signal is a signal generated when the output grid frequency is less than the grid frequency setting value; The high frequency signal is a signal generated when the output grid frequency is greater than the grid frequency setting value; The ampere-frequency signal is a signal generated when the output grid frequency is equal to the preset grid frequency value; The frequency modulation monitoring operation includes parameter processing and ring modulation processing.

4. A frequency modulation monitoring system for a box-type energy storage power supply cabinet as claimed in claim 3, characterized in that: The specific operation flow of the parameter processing is as follows: Step 1: Identify the FM analysis signal group: When a low-frequency signal is identified, low-frequency parameter processing is performed, wherein the low-frequency parameter processing is used to reduce the proportion of the low-frequency signal in the frequency modulation analysis signal group; When a high-frequency signal is identified, high-frequency parameter processing is performed, wherein the high-frequency parameter processing is used to reduce the proportion of the high-frequency signal in the frequency modulation analysis signal group; When the frequency signal is identified, the output grid frequency of the frequency regulating unit will continue to be monitored within the preset time period; Step 2: Obtain temperature control parameters and ambient temperature control parameters, wherein 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 environment temperature of the frequency modulation unit within a preset time period.

5. A frequency modulation monitoring system for a box-type energy storage power supply cabinet as claimed in claim 4, characterized in that: The specific operation process of the ring adjustment process is as follows: The temperature adjustment data is evaluated in combination with the obtained frequency modulation response evaluation index to obtain an environmental adjustment evaluation index, wherein the temperature adjustment data is obtained according to the temperature adjustment parameters and environmental temperature adjustment parameters obtained within a preset time period, and the temperature adjustment data includes a temperature parameter difference, a temperature parameter ratio, a temperature parameter mean, and a temperature parameter mean difference, and the environmental adjustment evaluation index is used to evaluate the influence of the temperature conditions of the frequency modulation environment of the frequency modulation unit on the frequency modulation performance; According to the obtained environmental adjustment evaluation index, the temperature adjustment data is temperature-adjusted until the temperature adjustment parameter is equal to the corresponding environmental adjustment parameter, wherein the temperature adjustment means adjusting the frequency adjustment environment temperature of the frequency adjustment unit by the temperature parameter difference to reduce the influence of the temperature parameter difference on the frequency adjustment of the frequency adjustment unit; The calculation formula of the environmental assessment index is: ； In the formula, m is the number of the frequency-modulating unit, , M is the total number of frequency-regulated units, n is the number of the preset time period, , N is the total number of preset time periods, e is a natural constant, It represents the environmental regulation evaluation index of the mth frequency regulation unit in the nth preset time period. It represents the frequency regulation response evaluation index of the mth frequency regulation unit in the nth preset time period, It indicates the temperature parameter difference of the mth frequency-regulated unit in the nth preset time period. It represents the temperature parameter ratio of the mth frequency-regulated unit in the nth preset time period. It represents the mean value of the temperature parameter of the mth frequency-regulated unit in the nth preset time period. It represents the average difference of temperature parameters of the mth frequency-regulated unit in the nth preset time period.

6. A frequency modulation monitoring system for a box-type energy storage power supply cabinet as claimed in claim 5, characterized in that: The control parameters of the frequency modulation unit are adjusted according to the abnormal information of the output grid frequency, and then the frequency modulation monitoring index is obtained according to the waveform fluctuation of the control parameter on the oscilloscope. The frequency modulation monitoring index is used to measure the frequency modulation effect of the frequency modulation unit within a preset time period. The specific steps of obtaining the frequency modulation monitoring index are: At a preset current measurement point and a preset voltage measurement point, a current peak value floating value and a voltage peak value floating value of a current waveform and a voltage waveform in a preset measurement period are recorded in real time by an oscilloscope and normalized, wherein the preset measurement period includes a current peak value and a voltage peak value; 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, the preset environmental regulation evaluation index correction factor is obtained from the preset database and the normalized frequency modulation rate, current peak floating value and voltage peak floating value are combined to obtain the frequency modulation monitoring index, and the frequency modulation rate is the ratio of the frequency modulation speed to the preset time period.

7. A frequency modulation monitoring system for a box-type energy storage power supply cabinet as claimed in claim 6, characterized in that: The frequency modulation monitoring index is calculated by the following formula: ； Where h is the number of the preset current measurement point, , H is the total number of preset current measurement points, q is the number of preset voltage measurement points, , Q is the total number of preset voltage measurement points, It indicates the frequency regulation monitoring index of the mth frequency regulation unit in the nth preset time period. represents the correction factor of environmental assessment indicators, Indicates the frequency modulation rate of the mth frequency modulation unit in the nth preset time period, It indicates the current peak floating value of the mth frequency-regulated unit at the hth preset current measurement point in the nth preset time period. It represents the voltage peak floating value of the qth preset voltage measurement point of the mth frequency modulation unit in the nth preset time period.

8. A frequency modulation monitoring system for a box-type energy storage power supply cabinet as claimed in claim 7, characterized in that: The method further comprises performing deviation compensation on the frequency modulation unit according to the obtained frequency deviation value, and then taking the frequency modulation load compensation amount as the compensation value of the frequency modulation unit, wherein the frequency modulation load compensation amount includes a primary frequency modulation load compensation amount and a secondary frequency modulation load compensation amount; The frequency regulation load compensation amount is used as the compensation value of the frequency regulation unit, and then the deviation compensation impact evaluation value is obtained by combining the obtained frequency regulation load compensation amount, the frequency deviation value and the frequency regulation monitoring index. The deviation compensation impact evaluation value is used to comprehensively evaluate the influence of the deviation compensation on the frequency stability of the output power grid. The deviation compensation impact evaluation value is calculated by the following formula: ； ； ； In the formula, It represents the deviation compensation impact assessment value of the mth frequency regulating unit in the nth preset time period, It indicates the frequency regulation load compensation of the mth frequency regulation unit in the nth preset time period. It indicates the secondary frequency regulation load compensation amount of the mth frequency regulation unit in the nth preset time period. Indicates the frequency deviation value of the mth frequency-regulated unit in the nth preset time period, It represents the rated load of the mth frequency regulating unit in a frequency regulating process. It represents the rated speed of the mth frequency regulating unit in a frequency regulating process. Indicates the speed inequality of the frequency modulation unit during a frequency modulation process. Indicates the primary frequency modulation dead zone, Indicates the rated frequency of the frequency-modulating unit during a frequency modulation process. represents the rated load of the mth frequency regulating unit during the secondary frequency regulation process, It represents the rated speed of the mth frequency regulating unit during the secondary frequency regulating process. Indicates the speed inequality of the frequency-modulating unit during the secondary frequency modulation process. Indicates the secondary frequency modulation dead zone, Indicates the rated frequency of the frequency regulating unit during the secondary frequency regulation process.

9. A frequency modulation monitoring system for a box-type energy storage power supply cabinet as claimed in claim 8, characterized in that: The specific process of performing deviation compensation on the frequency modulation unit according to the obtained frequency deviation value is as follows: Adjust the output grid frequency within a preset time period according to the received adjustment amount to obtain a first frequency deviation value, wherein the adjustment amount includes a frequency deviation value and a frequency regulation load compensation amount, and the first frequency deviation value is a deviation value between the adjusted output grid frequency and a grid frequency setting value within the preset time period; When the first frequency deviation value is 0, the frequency change of the power grid output by the frequency regulating unit within the preset time period is continuously monitored; When the first frequency deviation value is not 0, the output grid frequency is continuously adjusted according to the first frequency deviation value to obtain a second frequency deviation value until the second frequency deviation value is 0, wherein the second frequency deviation value is the deviation value between the output grid frequency after adjustment according to the first frequency deviation value and the grid frequency setting value.

10. A method for applying a frequency modulation monitoring system of a box-type energy storage power supply cabinet as described in any one of claims 1 to 9, characterized in that: The following steps are involved: S1, obtaining the impact load data when the frequency modulation unit is connected to the power grid, and at the same time obtaining the response load data after the frequency modulation unit is connected to the power grid in real time and monitoring the output power grid frequency of the frequency modulation unit in a preset time period in real time, wherein the frequency modulation 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 setting value 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, sound and light alarms are issued and corresponding solutions are taken. At the same time, frequency modulation monitoring operations are 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 setting value. The sound and light 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 modulation unit according to the abnormal information of the output grid frequency and perform secondary frequency modulation, and at the same time perform deviation compensation on the frequency modulation unit according to 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, and 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 is restored to the grid frequency setting value within the preset time period.

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