A multi-power all-time energy following energy storage system

Abstract

The present application relates to the technical field of energy. The present application relates to a multi-power full-time energy tracking energy storage system. It comprises a data effective reservation unit, a PCS matching unit, a VSG control working unit, a parameter updating simulation unit and a simulation parameter reservation unit; the data effective reservation unit is used for collecting load power data, and simultaneously performing effectiveness analysis on the load power data; according to the analysis result, effectiveness reservation is performed; the PCS matching unit is used for establishing a PCS group, and simultaneously performing working parameter analysis on the multi-power PCS in combination with historical load power data in the PCS group; through the combination of the reserved real-time load power data and the PCS group, multi-power PCS efficiency value evaluation is performed, the predicted efficiency value of each multi-power PCS under the condition of real-time load power data can be obtained, the multi-power PCS with the highest predicted efficiency value is selected as the working parameter for input, working mode switching is performed, and the overall efficiency of the system can be improved.

Description

Technical Field

[0001] This invention relates to the field of energy technology, and more specifically, to a multi-power, all-time energy tracking energy storage system. Background Technology

[0002] In recent years, the energy crisis and environmental issues have spurred the rise of distributed power generation technologies, represented by clean energy power generation technologies. Among these, industrial and commercial energy storage applications on the user side are the most widespread. Industrial and commercial energy storage systems refer to energy storage devices installed in industrial or commercial facilities. These systems can store excess electricity and release it during peak demand periods, helping businesses reduce electricity costs, optimize energy use, and improve the stability and security of energy supply. From industrial parks and commercial centers to data centers, hospitals, and schools, the application scenarios for energy storage systems are wide and diverse.

[0003] Existing user-side energy storage systems often use multiple power storage circuits (PCS) connected in parallel. In practical applications, some PCS are activated to achieve the preset power output based on demand. However, each PCS has individual differences; specifically, different PCS are often most efficient only within specific power ranges. During other power ranges, the overall efficiency is lower when the system reduces or exceeds its power output. Therefore, the current technology, which fixes the output power of the PCS and activates / deactivates some PCS based on the preset total output, is too simplistic and cannot effectively improve efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-power, all-time energy tracking energy storage system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, a multi-power all-time energy tracking energy storage system is provided, including a data retention unit, a PCS matching unit, a VSG control unit, a parameter update simulation unit, and a simulation parameter retention unit.

[0006] The data retention unit is used to collect load power data, perform validity analysis on the load power data, and retain the valid data based on the analysis results.

[0007] The PCS matching unit is used to establish a PCS group, and at the same time, analyze the working parameters of the multi-power PCS in the PCS group in combination with historical load power data. Then, based on the analysis results, the working parameters of the multi-power PCS are set, and a corresponding load power range is matched for each multi-power PCS.

[0008] The VSG control working unit is used to establish a VSG control terminal, and then connect to the data retention unit through the VSG control terminal for load monitoring. The real-time load power data is combined with the PCS group to evaluate the efficiency value of the multi-power PCS, and the multi-power PCS with the highest efficiency value is selected for working mode switching.

[0009] The parameter update simulation unit is used to establish a parameter simulation model at the VSG control terminal, then input the real-time load power data into the parameter simulation model for simulation, compare the simulation results with the efficiency value of the current multi-power PCS, and replace the current multi-power PCS with the simulation results based on the comparison results.

[0010] The simulation parameter retention unit is used to monitor energy storage quality during the simulation result replacement process. It retains the simulation results in the PCS group according to the monitoring process and updates the range of multi-power PCS with overlapping load power ranges.

[0011] As a further improvement to this technical solution, the data retention unit collects load power data through a smart meter and immediately performs a data validity judgment on the collected load power data, excluding abnormal and invalid data. For abnormal and invalid data, a data smoothing algorithm and the nearest valid data are used for replacement processing, and then the valid data and the replacement data are retained.

[0012] Simultaneously, it acquires the real-time operating status and equipment parameters of the energy storage device.

[0013] As a further improvement to this technical solution, the calculation formula for the data retention unit is as follows:

[0014]

[0015] Among them, S t The power value P of the t-th data point after smoothing. t This is the power value of the current data point, S t-1 It is the power value of the previous data point after smoothing. α is the smoothing coefficient, which is between 0 and 1. By continuously adjusting the smoothing coefficient α, abnormal and invalid data are smoothed.

[0016] As a further improvement to this technical solution, the PCS matching unit includes a PCS group establishment module and a PCS initialization module;

[0017] The PCS group creation module is used to create PCS groups, thereby retaining multi-power PCS and creating blank multi-power PCS to be adjusted in the PCS group.

[0018] The PCS initialization module is used to perform initialization energy storage regulation working parameter analysis on blank multi-power PCS to be adjusted in combination with equipment parameters, adjust the working parameters of blank multi-power PCS to be adjusted in the PCS group according to the analysis results, and match the corresponding load power range for each multi-power PCS in the PCS group according to the analysis results.

[0019] As a further improvement to this technical solution, the VSG control working unit includes a VSG establishment module and a VSG switching module;

[0020] The VSG establishment module is used to establish the VSG control terminal. Simultaneously, the VSG control terminal receives the effective load power data retained by the data retention unit, and then controls the U output AC side via the VSG. vx and I vx Regression control of the operation of multiple PCS;

[0021] The VSG switching module is used to combine the retained real-time load power data with the PCS group to evaluate the efficiency value of the multi-power PCS, obtain the predicted efficiency value of each multi-power PCS under the real-time load power data, and then select the multi-power PCS with the highest predicted efficiency value as the working parameter for input, thereby switching the working mode.

[0022] As a further improvement to this technical solution, the calculation formula for the VSG establishment module is as follows:

[0023]

[0024] Where P is active power, U vx It is the output AC side voltage, I vx It is the output AC side current, and cosβ is the power factor;

[0025]

[0026] Where Q is reactive power, U vx It is the output AC side voltage, I vx It is the output AC side current, and sinδ is the sine value of the power factor;

[0027]

[0028] Where w is the output frequency of the virtual synchronous generator, w0 is the rated frequency, and D p It is the active frequency droop factor, P ref P is the reference active power, and P is the actual active power.

[0029]

[0030] Where E is the output voltage amplitude of the virtual synchronous generator, E0 is the rated voltage amplitude, and C... p It is the reactive voltage droop factor, Q ref Q is the reference reactive power.

[0031] As a further improvement to this technical solution, the calculation formula for the VSG switching module is as follows:

[0032]

[0033] Among them, P out，i It is the output power, U out，i (t) is the output voltage of the i-th PCS at time t, I out，i (t) is the output current at time t, and the output voltage and current are assumed to be functions of time.

[0034]

[0035] Among them, P in，i It is the input power, U in，i (t) is the input voltage of the i-th PCS at time t, I in，i (t) is the input current at time t;

[0036]

[0037] Where, η i (t) represents the efficiency value at each time t, with a time interval [t1, t2] set, and the average efficiency value is calculated:

[0038]

[0039] Where, ηp i Let dt be the average efficiency value. Then, we integrate the variable t over the interval [t1, t2] to find the multi-power PCS that maximizes the average efficiency value and use its operating parameters as input to switch the operating mode.

[0040] As a further improvement to this technical solution, the parameter update simulation unit includes a parameter simulation module and an efficiency comparison module;

[0041] The parameter simulation module is used to establish a parameter simulation model at the VSG control terminal using the equipment parameters of the energy storage device. At the same time, real-time load power data is input into the parameter simulation model for simulation. During the simulation process, the operating parameters of the multi-power PCS are automatically adjusted, and the operating parameters are summarized and saved based on the simulation results.

[0042] The efficiency comparison module is used to evaluate the efficiency value of the multi-power PCS obtained by the parameter simulation module, and then compare the predicted efficiency value obtained by the simulation result with the efficiency value of the multi-power PCS corresponding to the current working mode. When the efficiency value of the simulation result is greater than the efficiency value of the multi-power PCS corresponding to the current working mode, the VSG control terminal uses the simulation result as the working parameter input to switch the working mode.

[0043] As a further improvement to this technical solution, the simulation parameter retention unit includes a quality monitoring module and a range update module;

[0044] The quality monitoring module is used to monitor the energy storage quality of the energy storage device in real time when the simulation structure replaces the multi-power PCS corresponding to the current working mode. When the energy storage quality decreases, the replacement of the simulation result is stopped. Conversely, when the energy storage quality does not decrease, the monitoring continues until the simulation result is replaced.

[0045] The range update module is used to save the simulation results as multi-power PCS in the PCS group when the simulation results are replaced, and at the same time, use the real-time load power data as the corresponding adaptive load range of the multi-power PCS. Then, it performs load range reduction update on other multi-power PCS with overlapping ranges.

[0046] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0047] 1. In this multi-power full-time energy tracking energy storage system, by combining the retained real-time load power data and PCS group to evaluate the efficiency value of multi-power PCS, the predicted efficiency value of each multi-power PCS under the real-time load power data can be obtained. The multi-power PCS with the highest predicted efficiency value is selected as the input for working parameters and the working mode is switched, which can improve the overall efficiency of the system. At the same time, at the VSG control terminal, a parameter simulation model is established through the equipment parameters of the energy storage device. The real-time load power data is input into the model for simulation, and the working parameters of the multi-power PCS are automatically adjusted. Based on the simulation results, the efficiency value is evaluated and the working mode is switched, which further optimizes the performance of the system.

[0048] 2. In this multi-power all-time energy tracking energy storage system, the real-time operating status of the energy storage device is monitored for energy quality when the simulation results replace the multi-power PCS corresponding to the current operating mode. When the energy storage quality decreases, the replacement of the simulation results is stopped, ensuring the stability and reliability of the system. When the energy storage quality does not decrease, monitoring continues until the simulation results are replaced. The simulation results are then saved as multi-power PCS in the PCS group. At the same time, the real-time load power data is used as the corresponding adaptive load range of the multi-power PCS. Then, the load range of other multi-power PCS with overlapping ranges is reduced and updated, realizing dynamic optimization of the energy storage system and rational allocation of resources. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0050] Figure 2 This is a schematic diagram of the VSG control principle of the present invention.

[0051] The meanings of the labels in the diagram are as follows:

[0052] 10. Data retention unit; 20. PCS matching unit; 30. VSG control unit; 40. Parameter update simulation unit; 50. Simulation parameter retention unit. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] Please see Figure 1 - Figure 2 As shown, the purpose of this embodiment is to provide a multi-power all-time energy tracking energy storage system, including a data retention unit 10, a PCS matching unit 20, a VSG control working unit 30, a parameter update simulation unit 40, and a simulation parameter retention unit 50.

[0055] The data retention unit 10 is used to collect load power data, perform validity analysis on the load power data, and retain the valid data based on the analysis results.

[0056] The data retention unit 10 collects load power data through the smart meter and immediately performs a data validity check on the collected load power data, eliminating abnormal and invalid data. For abnormal and invalid data, a data smoothing algorithm and the nearest valid data are used for replacement processing. Then, the valid data and the replacement data are retained. The specific steps are as follows:

[0057] Installing and configuring smart meters: Select a suitable smart meter to ensure that its measurement accuracy and range meet the load power measurement requirements. Install the smart meter correctly in the load circuit, and then the smart meter collects the load power in real time according to the set sampling frequency.

[0058] Determine the validity criteria: Set a reasonable power range; data outside this range is considered abnormal and invalid. Based on the normal operating power range of the load, set upper and lower thresholds, as follows:

[0059]

[0060] Among them, S t The power value P of the t-th data point after smoothing. t This is the power value of the current data point, S t-1 It is the power value of the previous data point after smoothing. α is the smoothing coefficient, which is between 0 and 1. By continuously adjusting the smoothing coefficient α, abnormal and invalid data are smoothed.

[0061] Replace with the nearest valid data: Determine the location of the abnormal invalid data point, find the nearest valid data point, and replace the abnormal invalid data with the power value of the nearest valid data point;

[0062] Simultaneously, it acquires the real-time operating status and equipment parameters of the energy storage device.

[0063] Establish a communication connection with the energy storage device, send instructions to the energy storage device to request real-time operating status and device parameters, and then the energy storage device responds to the instructions and returns relevant data.

[0064] PCS matching unit 20 is used to establish PCS group, and at the same time, analyze the working parameters of the multi-power PCS in the PCS group in combination with historical load power data. Then, based on the analysis results, the working parameters of the multi-power PCS are set, and the corresponding load power range is matched for each multi-power PCS.

[0065] PCS matching unit 20 includes a PCS group establishment module and a PCS initialization module;

[0066] The PCS group creation module is used to create PCS groups, thereby reserving multi-power PCS and creating blank multi-power PCS to be adjusted in the PCS group.

[0067] The PCS initialization module is used to analyze the initialization energy storage control parameters of blank multi-power PCS to be adjusted in conjunction with equipment parameters. Based on the analysis results, the operating parameters of the blank multi-power PCS to be adjusted in the PCS group are adjusted. At the same time, based on the analysis results, a corresponding load power range is matched for each multi-power PCS in the PCS group. The specific steps are as follows:

[0068] Create a data structure: Choose an array data structure to represent the PCS group, traverse the existing multi-power PCS, add them one by one to the PCS group, and record the key attributes of each PCS;

[0069] Create a blank multi-power PCS to be adjusted: Create multiple new PCS objects in the PCS group, initially in a blank state to be adjusted, and set a flag for this blank PCS object to indicate that it needs to be initialized and its parameters adjusted;

[0070] Initialization based on equipment parameters: Collect equipment parameters related to the energy storage system, analyze and initialize energy storage regulation parameters based on equipment parameters and the working requirements of the energy storage system, and calculate appropriate charging power, discharging power, power conversion efficiency, etc.

[0071] Update parameter values: Based on the working parameters obtained from the analysis, update the corresponding attribute values ​​of the blank PCS object to be adjusted, set parameters such as charging power, discharging power, and working mode, and at the same time verify the rationality of the adjusted parameters to ensure that they are within the allowable range of the equipment;

[0072] Determine the load power range: Iterate through each PCS object in the PCS group and match it with the corresponding load power range based on its rated power and performance characteristics.

[0073] VSG control unit 30 is used to establish VSG control terminal, and then connects to data retention unit 10 through VSG control terminal for load monitoring. Real-time load power data is combined with PCS group to evaluate the efficiency value of multi-power PCS, and the multi-power PCS with the highest efficiency value is selected for working mode switching.

[0074] VSG control unit 30 includes a VSG establishment module and a VSG switching module;

[0075] like Figure 2 As shown, the VSG establishment module is used to establish the VSG control terminal. Simultaneously, the VSG control terminal receives the effective load power data retained by the data retention unit 10. Then, through VSG control, the operation of multiple PCS units is controlled by the Uvx and Ivx regression of the output AC side. The specific steps are as follows:

[0076] Establish the VSG control terminal: Select a suitable controller, such as a digital signal processor (DSP) or microcontroller (MCU), with sufficient computing power and input / output interfaces. Connect sensors to measure the voltage and current on the output AC side. Then develop the VSG control algorithm program to realize the function of a virtual synchronous generator. At the same time, set up a communication interface to receive effective load power data.

[0077] The VSG control terminal receives the retained effective load power data: determines the communication protocol and interface, connects with the data retention unit 10 that stores the effective load power data, verifies and parses the received data to ensure the accuracy of the data;

[0078] Measurement of output AC side parameters: The voltage U on the output AC side is measured in real time via a connected sensor. vx and current I vx The measured voltage and current signals are filtered and amplified to improve signal quality;

[0079] Calculate control parameters: based on the measured U vx and I vx Based on the VSG control algorithm, the parameters required to control the operation of multiple PCS are calculated, as shown in the following formula:

[0080]

[0081] Where P is active power, U vx It is the output AC side voltage, I vx It is the output AC side current, and cosβ is the power factor;

[0082]

[0083] Where Q is reactive power, U vx It is the output AC side voltage, I vx It is the output AC side current, and sinδ is the sine value of the power factor;

[0084]

[0085] Where w is the output frequency of the virtual synchronous generator, w0 is the rated frequency, and D p It is the active frequency droop factor, P ref P is the reference active power, and P is the actual active power.

[0086]

[0087] Where E is the output voltage amplitude of the virtual synchronous generator, E0 is the rated voltage amplitude, and C... p It is the reactive voltage droop factor, Q refQ is the reference reactive power;

[0088] Send control commands: Convert the calculated control parameters into control commands and send them to the multi-power PCS to control its output power, frequency, voltage and other parameters.

[0089] The VSG switching module is used to combine the retained real-time load power data with the PCS group to evaluate the efficiency value of the multi-power PCS. It obtains the predicted efficiency value of each multi-power PCS under the real-time load power data, and then selects the multi-power PCS with the highest predicted efficiency value as the input for operating parameters, thereby switching the operating mode. There are n multi-power PCS. For the i-th PCS, the formula is as follows:

[0090]

[0091] Among them, P out，i It is the output power, U out，i (t) is the output voltage of the i-th PCS at time t, I out，i (t) is the output current at time t, and the output voltage and current are assumed to be functions of time.

[0092]

[0093] Among them, P in，i It is the input power, U in，i (t) is the input voltage of the i-th PCS at time t, I in，i (t) is the input current at time t;

[0094]

[0095] Where, η i (t) represents the efficiency value at each time t, with a time interval [t1, t2] set, and the average efficiency value is calculated:

[0096]

[0097] Where, ηp i Let dt be the average efficiency value. Then, we integrate the variable t over the interval [t1, t2] to find the multi-power PCS that maximizes the average efficiency value and use its operating parameters as input to switch the operating mode.

[0098] The parameter update simulation unit 40 is used to establish a parameter simulation model at the VSG control terminal, then input the real-time load power data into the parameter simulation model for simulation, compare the simulation results with the efficiency value of the current multi-power PCS, and replace the current multi-power PCS with the simulation results based on the comparison results.

[0099] The parameter update simulation unit 40 includes a parameter simulation module and an efficiency comparison module;

[0100] The parameter simulation module is used to establish a parameter simulation model at the VSG control terminal using the equipment parameters of the energy storage device. Simultaneously, real-time load power data is input into the parameter simulation model for simulation. During the simulation, the operating parameters of the multi-power PCS are automatically adjusted, and the operating parameters are summarized and saved based on the simulation results. The specific steps are as follows:

[0101] Model building: For modeling based on physical principles, mathematical models of energy storage systems and PCS can be built using circuit theory, the law of conservation of energy, etc. For example, the overall model can be built based on the equivalent circuit model of the battery and the power conversion equation of the PCS. At the same time, some known data can be used to verify the established model and check the accuracy and reliability of the model.

[0102] Simulation using real-time load power data: Input real-time load power data into the parameter simulation model, and simulate the operation of the energy storage system and PCS according to the model's calculation logic. Record key parameters during the simulation process, such as the output power, input power, and efficiency of the PCS.

[0103] Automatic adjustment of operating parameters of multi-power PCS: Rule-based adjustment can adjust operating parameters according to preset conditions and rules. For example, when the load power increases, the output power of the PCS can be increased. Optimization algorithm adjustment can use optimization algorithms, such as genetic algorithms and particle swarm optimization algorithms, to continuously iterate and search for the optimal combination of operating parameters. Based on the determined adjustment strategy, the operating parameters of multi-power PCS can be automatically adjusted.

[0104] Based on the simulation results, the working parameters are summarized and saved: the simulation results are analyzed, key information is extracted, such as efficiency values ​​and stability under different working parameters, and the analyzed working parameters and corresponding simulation results are summarized and organized.

[0105] The efficiency comparison module is used to evaluate the efficiency value of the simulation results obtained by the parameter simulation module, and then compare the predicted efficiency value obtained by the simulation results with the efficiency value of the multi-power PCS corresponding to the current working mode. When the efficiency value of the simulation result is greater than the efficiency value of the multi-power PCS corresponding to the current working mode, the VSG control terminal uses the simulation result as the working parameter input to switch the working mode.

[0106] The simulation parameter retention unit 50 is used to monitor the energy storage quality during the simulation result replacement process. The simulation results are retained in the PCS group according to the monitoring process, and the range is updated for multi-power PCS with overlapping load power ranges.

[0107] The simulation parameter retention unit 50 includes a quality monitoring module and a range update module;

[0108] The quality monitoring module is used to monitor the energy storage quality of the energy storage device in real time when the simulation structure replaces the multi-power PCS corresponding to the current working mode. When the energy storage quality decreases, the replacement of the simulation results is stopped. Conversely, when the energy storage quality does not decrease, the monitoring continues until the simulation results are replaced.

[0109] If it is determined that the energy storage quality has decreased, immediately stop replacing the simulation results, perform fault diagnosis on the system, find out the cause of the decrease in energy storage quality, which may be that the simulation results are not suitable for the current state of the energy storage equipment, equipment failure, etc., and take corresponding repair measures, such as adjusting simulation parameters, repairing or replacing faulty equipment, etc.

[0110] The range update module is used to save the simulation results as multi-power PCS in the PCS group when the simulation results have been replaced. At the same time, it uses the real-time load power data as the corresponding adaptive load range for the multi-power PCS. Then, it updates the load range of other multi-power PCS with overlapping ranges. The specific steps are as follows:

[0111] Save simulation results to PCS group: Confirm the key parameters of the multi-power PCS in the simulation results, such as output power, input power, efficiency, etc., and add the multi-power PCS information in the simulation results to the PCS group for saving.

[0112] Analyze real-time load power data: Analyze the real-time load power data to determine its characteristics, such as power range and fluctuation. Use the analyzed real-time load power data range as the corresponding adaptive load range of the newly saved multi-power PCS for association and recording.

[0113] Find PCS with overlapping ranges: Traverse all multi-power PCS in the PCS group and find other PCS whose load ranges overlap with the newly saved multi-power PCS.

[0114] Perform load range reduction update: For PCS with overlapping ranges, reduce their load ranges according to the actual situation. If the load range of the newly saved PCS completely includes part of the load range of another PCS, then the load range of that other PCS can be adjusted to the part that does not overlap with the new PCS.

[0115] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-power, all-time energy tracking energy storage system, characterized in that: It includes a data retention unit (10), a PCS matching unit (20), a VSG control working unit (30), a parameter update simulation unit (40), and a simulation parameter retention unit (50). The data retention unit (10) is used to collect load power data, perform validity analysis on the load power data, and retain the validity based on the analysis results. The PCS matching unit (20) is used to establish a PCS group, and at the same time, analyze the working parameters of the multi-power PCS in the PCS group in combination with historical load power data. Then, based on the analysis results, the working parameters of the multi-power PCS are set, and the corresponding load power range is matched for each multi-power PCS. The VSG control working unit (30) is used to establish a VSG control terminal, and then connect to the data retention unit (10) through the VSG control terminal for load monitoring. The real-time load power data is combined with the PCS group to evaluate the efficiency value of the multi-power PCS, and the multi-power PCS with the highest efficiency value is selected for working mode switching. The parameter update simulation unit (40) is used to establish a parameter simulation model at the VSG control terminal, then input the real-time load power data into the parameter simulation model for simulation, and compare the simulation results with the efficiency value of the current multi-power PCS. Based on the comparison results, the simulation results replace the current multi-power PCS. The simulation parameter retention unit (50) is used to monitor the energy storage quality during the simulation result replacement process, retain the simulation results in the PCS group according to the monitoring process, and update the range of multi-power PCS with overlapping load power ranges. The parameter update simulation unit (40) includes a parameter simulation module and an efficiency comparison module; The parameter simulation module is used to establish a parameter simulation model at the VSG control terminal using the equipment parameters of the energy storage device. At the same time, real-time load power data is input into the parameter simulation model for simulation. During the simulation process, the operating parameters of the multi-power PCS are automatically adjusted, and the operating parameters are summarized and saved based on the simulation results. The efficiency comparison module is used to evaluate the efficiency value of the multi-power PCS obtained by the parameter simulation module, and then compare the predicted efficiency value obtained by the simulation result with the efficiency value of the multi-power PCS corresponding to the current working mode. When the efficiency value of the simulation result is greater than the efficiency value of the multi-power PCS corresponding to the current working mode, the VSG control terminal uses the simulation result as the working parameter input to switch the working mode.

2. The multi-power all-time energy tracking energy storage system according to claim 1, characterized in that: The data retention unit (10) collects load power data through the smart meter and immediately performs a data validity judgment on the collected load power data, excluding abnormal and invalid data. For abnormal and invalid data, a data smoothing algorithm and the nearest valid data are used for replacement processing, and then the valid data and the replacement data are retained. Simultaneously, it acquires the real-time operating status and equipment parameters of the energy storage device.

3. The multi-power all-time energy tracking energy storage system according to claim 1, characterized in that: The calculation formula for the data retention unit (10) is as follows: ； Among them, S t The power value P of the t-th data point after smoothing. t This is the power value of the current data point, S t-1 It is the power value of the previous data point after smoothing. α is the smoothing coefficient, which is between 0 and 1. By continuously adjusting the smoothing coefficient α, abnormal and invalid data are smoothed.

4. The multi-power all-time energy tracking energy storage system according to claim 1, characterized in that: The PCS matching unit (20) includes a PCS group establishment module and a PCS initialization module; The PCS group creation module is used to create PCS groups, thereby retaining multi-power PCS and creating blank multi-power PCS to be adjusted in the PCS group. The PCS initialization module is used to perform initialization energy storage regulation working parameter analysis on blank multi-power PCS to be adjusted in combination with equipment parameters, adjust the working parameters of blank multi-power PCS to be adjusted in the PCS group according to the analysis results, and match the corresponding load power range for each multi-power PCS in the PCS group according to the analysis results.

5. The multi-power all-time energy tracking energy storage system according to claim 1, characterized in that: The VSG control unit (30) includes a VSG establishment module and a VSG switching module; The VSG establishment module is used to establish the VSG control terminal. At the same time, the VSG control terminal receives the effective load power data retained by the data validity retention unit (10), and then controls the U output AC side through the VSG. vx and I vx Regression control of the operation of multiple PCS; The VSG switching module is used to combine the retained real-time load power data with the PCS group to evaluate the efficiency value of the multi-power PCS, obtain the predicted efficiency value of each multi-power PCS under the real-time load power data, and then select the multi-power PCS with the highest predicted efficiency value as the working parameter for input, thereby switching the working mode.

6. The multi-power all-time energy tracking energy storage system according to claim 5, characterized in that: The calculation formula for the VSG establishment module is as follows: ； Where P is active power, U vx It is the output AC side voltage, I vx It is the output AC side current, and cosβ is the power factor; ； Where Q is reactive power, U vx It is the output AC side voltage, I vx It is the output AC side current, and sinδ is the sine value of the power factor; ； Where w is the output frequency of the virtual synchronous generator, w0 is the rated frequency, and D p It is the active frequency droop factor, P ref P is the reference active power, and P is the actual active power. ； Where E is the output voltage amplitude of the virtual synchronous generator, E0 is the rated voltage amplitude, and C... p It is the reactive voltage droop factor, Q ref Q is the reference reactive power.

7. A multi-power, all-time energy tracking energy storage system according to claim 5, characterized in that: The calculation formula for the VSG switching module is as follows: ； Among them, P out，i It is the output power, U out，i (t) is the output voltage of the i-th PCS at time t, I out，i (t) is the output current at time t, and we assume that the output voltage and current are functions of time. ； Among them, P in，i It is the input power, U in，i (t) is the input voltage of the i-th PCS at time t, I in，i (t) is the input current at time t; ； Where, η i (t) represents the efficiency value at each time t, with a time interval [t1, t2] set, and the average efficiency value is calculated: ； Where, ηp i Let dt be the average efficiency value. Then, we integrate the variable t over the interval [t1, t2] to find the multi-power PCS that maximizes the average efficiency value and use its operating parameters as input to switch the operating mode.

8. The multi-power all-time energy tracking energy storage system according to claim 1, characterized in that: The simulation parameter retention unit (50) includes a quality monitoring module and a range update module; The quality monitoring module is used to monitor the energy storage quality of the energy storage device in real time when the simulation structure replaces the multi-power PCS corresponding to the current working mode. When the energy storage quality decreases, the replacement of the simulation result is stopped. Conversely, when the energy storage quality does not decrease, the monitoring continues until the simulation result is replaced. The range update module is used to save the simulation results as multi-power PCS in the PCS group when the simulation results are replaced, and at the same time, use the real-time load power data as the corresponding adaptive load range of the multi-power PCS. Then, it performs load range reduction update on other multi-power PCS with overlapping ranges.

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