Grid-connected operation control method for bidirectional energy storage converter

Abstract

The invention provides a grid-connected operation control method for an energy storage bidirectional converter, and belongs to the technical field of operation control. The method comprises the following steps of: 1, judging whether a power grid control module is normally started or not by utilizing monitoring equipment of an energy storage system, and monitoring grid-connected data based on a circuit monitoring module to obtain an initial parameter; 2, setting an active power target and a reactive power target according to preset requirements of a power grid, and configuring a preset charging strategy; 3, charging the battery according to a preset charging strategy, and monitoring power grid parameters of a power grid after the output power of the energy storage system is controlled in real time according to a sensor; 4, analyzing by using an electric load model according to the power grid parameters and the initial parameters which are controlled to be output to obtain operation parameters; and 5, adjusting a power grid control module by adopting PID control in combination with the operation parameters, and judging whether the operation of the power grid meets the standard or not. The protection function configuration is perfect, and the safety of the energy storage bidirectional converter, the energy storage assembly and the micro-grid system under various fault conditions can be ensured.

Description

Technical Field

[0001] The present invention relates to the field of operation control technology, and in particular to a grid-connected operation control method for an energy storage bidirectional converter. Background Art

[0002] At present, with the continuous development of big data technology, energy storage inverters should have the function of grid-connected operation, which can realize independent decoupling control of power; and can be coordinated with the monitoring system to realize advanced applications of power systems. However, direct regulation of voltage and current usually results in inaccurate power factor regulation, resulting in voltage and current imbalance caused by regulation deviation, and grid failure.

[0003] Therefore, the present invention proposes a grid-connected operation control method for an energy storage bidirectional converter. Summary of the invention

[0004] The present invention provides a grid-connected operation control method for an energy storage bidirectional converter, which is used to realize independent bidirectional regulation of active power and reactive power, and can be coordinated with a monitoring system to realize advanced applications of the power system.

[0005] In one aspect, the present invention provides a method for controlling grid-connected operation of an energy storage bidirectional converter, comprising:

[0006] Step 1: Use the monitoring equipment of the energy storage system to determine whether the grid control module is started normally, and obtain initial parameters based on the grid-connected data monitored by the circuit monitoring module;

[0007] Step 2: Set active power targets and reactive power targets according to the preset requirements of the power grid, and configure the preset charging strategy;

[0008] Step 3: Charge the battery according to the preset charging strategy, and monitor the actual active power and reactive power output of the energy storage system in real time according to the sensor to control the grid parameters of the grid;

[0009] Step 4: Analyze the grid parameters and initial parameters output by active and reactive power control using the electric load model to obtain the operating parameters;

[0010] Step 5: Use PID control combined with operating parameters to adjust the power grid control module to determine whether the operation of the power grid meets the standards.

[0011] On the other hand, the monitoring equipment of the energy storage system is used to determine whether the grid control module is started normally, including:

[0012] Start the monitoring equipment of the energy storage system and all its components, and keep the monitoring equipment and all its components in normal startup state;

[0013] Use the monitoring component to connect to the interface of the power grid control module, obtain the status data returned by the interface of the power grid control module, process the status data returned by the interface, and judge the startup status of the power grid control module according to the status field of the status data returned by the interface. If the status field indicates an abnormality, check the component status of the power grid control module.

[0014] On the other hand, the initial parameters are obtained by monitoring the grid-connected data based on the circuit monitoring module, including:

[0015] Obtaining the interface return status data of the power grid control module, and obtaining the system parameters according to the corresponding matching of the standard parameter fields;

[0016] Use system control strategies to automatically adjust system parameters to be consistent with grid-connected parameters;

[0017] The circuit monitoring module is used to monitor the grid-connected data to obtain the initial parameters.

[0018] On the other hand, active power targets and reactive power targets are set according to the preset requirements of the power grid, including:

[0019] The historical output power of the current power grid is obtained according to the power grid control module, and combined with the preset requirements provided by the power grid operator, the active power target and reactive power target of the power grid are obtained as follows:

[0020] Where P represents the active power target, Q represents the reactive power target, V represents the actual voltage output by the power grid, i represents the actual current output by the power grid, t() represents the time processing function, cos(phi) represents the active power factor, sin(phi) represents the reactive power factor, e p Indicates the active power preset rate, e q Indicates the reactive power preset rate, Δ i Indicates the proportion of historical output power corresponding to the i-th time node, a i represents the historical output power corresponding to the i-th time node, and n represents the historical output power of n time nodes in total;

[0021] Finally, the active and reactive power targets of the power grid are obtained.

[0022] On the other hand, configure the preset charging strategy, including:

[0023] According to the active power target and reactive power target of the power grid, the required charging time of the target battery is determined as:

[0024] Where T represents the charging time required for the target battery, C represents the charge capacity of the target battery, m represents the grid-connected data, and there are m kinds of initial parameters related to frequency. jrepresents the eigenvalue of the j-th frequency-related parameter, the eigenvalue is obtained using the characteristic matrix, and c0 represents the preset charging target;

[0025] The charging rate is The preset charging strategy is configured according to the charging time and charging rate.

[0026] On the other hand, the actual active power and reactive power output of the energy storage system are monitored in real time by sensors, and the grid parameters of the grid after control include:

[0027] Performing operation configuration on the battery starting device according to a preset charging strategy and executing the operation;

[0028] Sensors are used to monitor the battery charge of the energy storage system in real time, record all active power and reactive power during the battery charging process, and the actual active power and reactive power after control of the grid parameter data.

[0029] On the other hand, the output grid parameters and initial parameters after actual active power and reactive power control are analyzed using the electric load model to obtain operating parameters, including:

[0030] Preprocessing the grid parameters and initial parameter data output after actual active power and reactive power control to obtain standard grid parameter data and standard initial parameter data;

[0031] Based on the electric load model, the initial parameter data is used as the initial value, the standard power grid parameter data is processed into a power grid parameter sequence of a standard time series, and the operating parameters of the power grid control module are output according to the power grid parameter sequence and the initial value.

[0032] On the other hand, PID control is used in combination with operating parameters to adjust the power grid control module to determine whether the operation of the power grid meets the standards, including:

[0033] According to the bidirectional regulation threshold of the grid connection, the target value of the operating parameter is formulated, and the operating parameter is processed by the PID control algorithm to obtain the PID coefficient of any operating parameter;

[0034] All operating parameters are processed using PID coefficients to obtain PID control signals, which are then input into the power grid control module to obtain the final parameters of the power grid operation;

[0035] If any operating parameter exceeds the safety threshold, the grid protection mechanism is executed. Otherwise, the bidirectional regulation threshold of the grid connection is used to execute the bidirectional regulation switching between the voltage source mode and the current source mode.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] The present invention provides a grid-connected operation control method for an energy storage bidirectional converter, which is used to realize independent bidirectional regulation of active power and reactive power, and can be coordinated with a monitoring system to realize advanced applications of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 It is a flow chart of a method for controlling grid-connected operation of an energy storage bidirectional converter provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Embodiment 1:

[0042] like Figure 1 As shown, an embodiment of the present invention provides a method for controlling grid-connected operation of an energy storage bidirectional converter, comprising:

[0043] Step 1: Use the monitoring equipment of the energy storage system to determine whether the grid control module is started normally, and obtain initial parameters based on the grid-connected data monitored by the circuit monitoring module;

[0044] Step 2: Set active power targets and reactive power targets according to the preset requirements of the power grid, and configure the preset charging strategy;

[0045] Step 3: Charge the battery according to the preset charging strategy, and monitor the actual active power and reactive power output of the energy storage system in real time according to the sensor to control the grid parameters of the grid;

[0046] Step 4: Analyze the grid parameters and initial parameters output by active and reactive power control using the electric load model to obtain the operating parameters;

[0047] Step 5: Use PID control combined with operating parameters to adjust the power grid control module to determine whether the operation of the power grid meets the standards.

[0048] In this embodiment, the energy storage system is an energy storage device that is used to store electrical energy when electricity demand is low and release electrical energy when demand increases to balance the load on the grid and improve the reliability of electricity supply.

[0049] In this embodiment, the monitoring device is a device used to monitor and record the performance and status of the energy storage system in real time, including sensors, data acquisition devices, communication interfaces, and display and alarm systems.

[0050] In this embodiment, the power grid refers to a system for transmitting and distributing electricity, including all facilities and equipment for power generation, transmission, distribution and consumption.

[0051] In this embodiment, the grid-connected data refers to various data collected and monitored when connected to the grid, including: grid voltage, grid frequency, active power, reactive power, etc.

[0052] In this embodiment, the initial parameters refer to the grid status data obtained from the monitoring equipment and sensors when the system is started.

[0053] In this embodiment, the preset requirements refer to expectations and standards for grid performance and energy storage system operation, including: voltage stability, frequency stability, active power target, reactive power target, etc.

[0054] In this embodiment, the active power target refers to the target value of active power output set in the power grid control system to ensure power grid stability and meet load demand, including: load balance, output of energy storage system, power generation and demand matching, etc.

[0055] In this embodiment, the reactive power target is a power target value that does not directly do work in the power grid but is beneficial to the voltage stability and power transmission of the power grid.

[0056] In this embodiment, the grid parameters refer to a series of key indicators used to describe and analyze the state and performance of the grid, including: voltage, current, power, grid frequency, etc.

[0057] In this embodiment, the electric load model is a mathematical tool used to simulate and predict the load in the power system, and predict the power demand in a certain time period in the future.

[0058] In this embodiment, the operating parameters refer to key values ​​that describe the operating status and performance of the power grid, including: voltage, power, frequency, energy storage system status, etc.

[0059] In this embodiment, PID control is the abbreviation of "proportional-integral-differential" controller, which achieves stable control by adjusting the error of system output in real time.

[0060] In this embodiment, the standard refers to the performance requirements and specifications of the power grid during normal operation, including: voltage standards, current standards, power standards, etc.

[0061] The working principle and beneficial effects of the above technical solution are: by real-time monitoring of the energy storage system, setting power targets and charging strategies, combined with PID control adjustment, the stability and efficiency of the power grid are optimized, the reliability of power grid operation is improved, the use of the energy storage system is optimized, and the power grid parameters are ensured to remain within the preset range.

[0062] Embodiment 2:

[0063] On the basis of the above-mentioned embodiment 1, the monitoring device of the energy storage system is used to determine whether the power grid control module is started normally, including:

[0064] Start the monitoring equipment of the energy storage system and all its components, and keep the monitoring equipment and all its components in normal startup state;

[0065] Use the monitoring component to connect to the interface of the power grid control module, obtain the status data returned by the interface of the power grid control module, process the status data returned by the interface, and judge the startup status of the power grid control module according to the status field of the status data returned by the interface. If the status field indicates an abnormality, check the component status of the power grid control module.

[0066] In this embodiment, components refer to independent but mutually coordinated parts in the power grid system, such as a control unit, a communication interface, a backup power supply, etc.

[0067] In this embodiment, the interface refers to the connection and communication channel used to exchange data between system components.

[0068] In this embodiment, the interface return status data is the data content transmitted by the interface when data is exchanged between systems.

[0069] In this embodiment, the status field refers to the key part of the data returned by the interface for indicating the power grid status, and different statuses are expressed in the form of code fields.

[0070] The working principle and beneficial effects of the above technical solution are: by starting and monitoring the equipment of the energy storage system, connecting the grid control module interface, obtaining and processing status data, judging the module status based on the data, and checking the component status if abnormal, so as to ensure the normal operation of the system, quickly locate the problem, and improve the reliability and stability of the system.

[0071] Embodiment 3:

[0072] Based on the above-mentioned embodiment 2, the grid-connected operation control method of the energy storage bidirectional converter is characterized in that the initial parameters are obtained by monitoring the grid-connected data based on the circuit monitoring module, including:

[0073] Obtaining the interface return status data of the power grid control module, and obtaining the system parameters according to the corresponding matching of the standard parameter fields;

[0074] Use system control strategies to automatically adjust system parameters to be consistent with grid-connected parameters;

[0075] The circuit monitoring module is used to monitor the grid-connected data to obtain the initial parameters.

[0076] In this embodiment, the standard parameter field is defined in the data returned by the system interface and is used to represent key parameters of the system status, performance or configuration.

[0077] In this embodiment, the system parameters refer to key values ​​set in the power grid control module for describing and adjusting the operating status of the system, including voltage, current, power factor, etc.

[0078] In this embodiment, the system control strategy refers to rules and methods for automatically adjusting system parameters to ensure that the system is consistent with the external environment, such as parameter calibration, dynamic adjustment, load balancing, etc.

[0079] In this embodiment, the grid-connected parameters refer to a set of key parameters that the power system needs to maintain during the grid-connected process, including voltage, current, power factor, frequency, load balance, etc.

[0080] The working principle and beneficial effect of the above technical solution are: by obtaining the interface status data of the power grid control module and matching the system parameters, the control strategy is used to automatically adjust the system to be consistent with the grid-connected parameters. The circuit monitoring module monitors the grid-connected data to obtain the initial parameters, ensures that the system parameters are consistent with the grid-connected parameters, and improves stability and reliability.

[0081] Embodiment 4:

[0082] On the basis of the above-mentioned embodiment 3, the active power target and the reactive power target are set according to the preset requirements of the power grid, including:

[0083] The historical output power of the current power grid is obtained according to the power grid control module, and combined with the preset requirements provided by the power grid operator, the active power target and reactive power target of the power grid are obtained as follows:

[0084] Where P represents the active power target, Q represents the reactive power target, V represents the actual voltage output by the power grid, i represents the actual current output by the power grid, t() represents the time processing function, cos(phi) represents the active power factor, sin(phi) represents the reactive power factor, e P Indicates the active power preset rate, e q Indicates the reactive power preset rate, Δ i Indicates the proportion of historical output power corresponding to the i-th time node, a i represents the historical output power corresponding to the i-th time node, and n represents the historical output power of n time nodes in total;

[0085] Finally, the active and reactive power targets of the power grid are obtained.

[0086] In this embodiment, the historical output power refers to the power value actually output by the power grid in the past period of time.

[0087] In this embodiment, the grid operator is a company responsible for managing and operating the grid, and its main responsibilities include planning, operation, maintenance and optimization of the grid.

[0088] In this embodiment, the time processing function is used to process, convert or analyze time series data, and convert the original time into a time series with preset standard time intervals.

[0089] In this embodiment, the power factor is an important parameter for measuring the relationship between actual power and apparent power (ie, the product of voltage and current) in the power system, and is a value between 0 and 1.

[0090] In this embodiment, the preset rate refers to the rate at which the set value changes. Active power is usually expressed in watts per minute (W / min), and reactive power is usually expressed in vars per minute (Var / min).

[0091] The working principle and beneficial effects of the above technical solution are: obtaining historical output power through the grid control module, and combining with the preset requirements of the grid operator, using actual voltage, current and power factor to calculate active and reactive power targets, accurately set targets, and dynamically adjust to optimize grid performance and improve stability and adaptability.

[0092] Embodiment 5:

[0093] On the basis of the above-mentioned embodiment 4, a preset charging strategy is configured, including:

[0094] According to the active power target and reactive power target of the power grid, the required charging time of the target battery is determined as:

[0095] Where T represents the charging time required for the target battery, C represents the charge capacity of the target battery, m represents the grid-connected data, and there are m kinds of initial parameters related to frequency. j represents the eigenvalue of the j-th frequency-related parameter, the eigenvalue is obtained using the characteristic matrix, and c0 represents the preset charging target;

[0096] The charging rate is The preset charging strategy is configured according to the charging time and charging rate.

[0097] In this embodiment, the charging capacity refers to the total amount of electricity required to fully charge the target battery, and the unit is kWh.

[0098] In this embodiment, the characteristic value represents a dynamic characteristic parameter of the system, such as voltage, current, etc.

[0099] In this embodiment, the characteristic matrix in power system analysis generally refers to a matrix that describes the dynamic characteristics of the system, and the elements are parameters that describe the dynamic behavior of the system, such as system damping, gain, etc.

[0100] In this embodiment, the preset charging target refers to the charging amount and charging time set according to the characteristics and needs of the power grid.

[0101] In this embodiment, the preset charging strategy includes: charging time, charging rate, charging peak configuration, etc.

[0102] The working principle and beneficial effects of the above technical solution are: according to the target battery charge capacity, frequency parameters and characteristic matrix, the required charging time is calculated. The charging strategy is configured using the charging time and rate, the charging plan is optimized, the charging efficiency is improved, and the battery life is extended through precise management.

[0103] Embodiment 6:

[0104] On the basis of the above-mentioned embodiment 1, the grid parameters of the grid after the actual active power and reactive power output by the energy storage system are controlled in real time by sensors include:

[0105] Performing operation configuration on the battery starting device according to a preset charging strategy and executing the operation;

[0106] Sensors are used to monitor the battery charge of the energy storage system in real time, record all active power and reactive power during the battery charging process, and the actual active power and reactive power after control of the grid parameter data.

[0107] In this embodiment, the initiating device refers to a device responsible for actually performing the charging operation during the charging process, such as a charging station.

[0108] In this embodiment, the job configuration refers to the process of performing configuration management on all devices according to a preset charging strategy.

[0109] The working principle and beneficial effects of the above technical solution are: configure and execute the battery startup equipment operation according to the preset charging strategy. Use sensors to monitor the battery charge in real time, record active and reactive power and grid parameter data, ensure efficient operation execution and track battery status in real time, optimize the charging process, and improve system stability.

[0110] Embodiment 7:

[0111] On the basis of the above-mentioned embodiment 6, the output grid parameters and initial parameters after actual active power and reactive power control are analyzed using the electric load model to obtain operating parameters, including:

[0112] Preprocessing the grid parameters and initial parameter data output after actual active power and reactive power control to obtain standard grid parameter data and standard initial parameter data;

[0113] Based on the electric load model, the initial parameter data is used as the initial value, the standard power grid parameter data is processed into a power grid parameter sequence of a standard time series, and the operating parameters of the power grid control module are output according to the power grid parameter sequence and the initial value.

[0114] In this embodiment, data preprocessing includes: data cleaning, data conversion, and data segmentation processing procedures.

[0115] In this embodiment, the power grid parameter sequence refers to a time series data set, which includes various parameters of the power grid at different time points.

[0116] In this embodiment, the standard time series is a set of time parameters with a consistent format and scale that is set in advance.

[0117] In this embodiment, the initial value refers to the starting condition used for calculation when the model is started.

[0118] The working principle and beneficial effects of the above technical solution are: obtaining standard grid parameters and initial parameter data through data preprocessing, converting these data into standard time series using the electric load model, outputting the operating parameters of the grid control module, improving data consistency, optimizing the grid control parameters, and enhancing the efficiency and stability of system operation.

[0119] Embodiment 8:

[0120] On the basis of the above-mentioned embodiment 7, the power grid control module is adjusted by using PID control combined with the operating parameters to determine whether the operation of the power grid meets the standards, including:

[0121] According to the bidirectional regulation threshold of the grid connection, the target value of the operating parameter is formulated, and the operating parameter is processed by the PID control algorithm to obtain the PID coefficient of any operating parameter;

[0122] All operating parameters are processed using PID coefficients to obtain PID control signals, which are then input into the power grid control module to obtain the final parameters of the power grid operation.

[0123] If any operating parameter exceeds the safety threshold, the grid protection mechanism is executed. Otherwise, the bidirectional regulation threshold of the grid connection is used to execute the bidirectional regulation switching between the voltage source mode and the current source mode.

[0124] In this embodiment, the bidirectional regulation threshold refers to a threshold value used to determine under what conditions switching between a voltage source mode (Voltage Source Mode) and a current source mode (Current Source Mode) is performed during the operation of the power grid.

[0125] In this embodiment, the target value is the desired operating parameter to be maintained in the system, which serves as a reference point for the PID control algorithm.

[0126] In this embodiment, PID control algorithm) is a widely used feedback control algorithm for automatically adjusting the system output to make it close to the set target value.

[0127] In this embodiment, the PID coefficients include three types: proportional coefficient (K_p), integral coefficient (K_i) and differential coefficient (K_d). These coefficients affect the performance of the PID controller, including response speed, stability and error elimination capability.

[0128] In this embodiment, the PID control signal is generated by a PID controller and is used to adjust the operating parameters of the power grid (such as voltage, current, frequency, etc.).

[0129] In this embodiment, the safety threshold is a set limit value used to ensure the safe operation of power grid equipment and systems.

[0130] In this embodiment, the grid protection mechanism refers to some mechanisms to ensure that the power system is protected when a fault or abnormal situation occurs, such as: overcurrent protection, overvoltage protection, undervoltage protection, overfrequency protection, etc.

[0131] In this embodiment, the voltage source mode refers to an operation mode in which the voltage is regarded as the main control variable in the power grid system, and the current is automatically adjusted according to the load demand.

[0132] In this embodiment, the current source mode is an operation mode in which the current is set as the main control variable in the power grid system, and the voltage is automatically adjusted according to the load change.

[0133] In this embodiment, bidirectional regulation switching is a mechanism for managing the transition between voltage source mode and current source mode in the power system.

[0134] The working principle and beneficial effects of the above technical solution are: perfect protection function configuration, overlapping protection, no dead zone, and can ensure the safety of energy storage bidirectional converters, energy storage components and microgrid systems under various fault conditions.

[0135] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling grid-connected operation of a bidirectional energy storage converter, characterized in that: include: Step 1: Use the monitoring equipment of the energy storage system to determine whether the grid control module is started normally, and obtain initial parameters based on the grid-connected data monitored by the circuit monitoring module; Step 2: Set active power targets and reactive power targets according to the preset requirements of the power grid, and configure the preset charging strategy; Step 3: Charge the battery according to the preset charging strategy, and monitor the actual active power and reactive power output of the energy storage system in real time according to the sensor to control the grid parameters of the grid; Step 4: Analyze the output grid parameters and initial parameters after actual active power and reactive power control using the electric load model to obtain operating parameters; Step 5: Use PID control combined with operating parameters to adjust the power grid control module to determine whether the operation of the power grid meets the standards.

2. A method for controlling grid-connected operation of an energy storage bidirectional converter according to claim 1, characterized in that: Use the monitoring equipment of the energy storage system to determine whether the power grid control module is started normally, including: Start the monitoring equipment of the energy storage system and all its components, and keep the monitoring equipment and all its components in normal startup state; Use the monitoring component to connect to the interface of the power grid control module, obtain the status data returned by the interface of the power grid control module, process the status data returned by the interface, and judge the startup status of the power grid control module according to the status field of the status data returned by the interface. If the status field indicates an abnormality, check the component status of the power grid control module.

3. A method for controlling grid-connected operation of an energy storage bidirectional converter according to claim 2, characterized in that: Based on the circuit monitoring module, the grid-connected data is monitored to obtain initial parameters, including: Obtaining the interface return status data of the power grid control module, and obtaining the system parameters according to the corresponding matching of the standard parameter fields; Use system control strategies to automatically adjust system parameters to be consistent with grid-connected parameters; The circuit monitoring module is used to monitor the grid-connected data to obtain the initial parameters.

4. A method for controlling grid-connected operation of an energy storage bidirectional converter according to claim 3, characterized in that: Set active power targets and reactive power targets based on the preset requirements of the grid, including: The historical output power of the current power grid is obtained according to the power grid control module, and combined with the preset requirements provided by the power grid operator, the active power target and reactive power target of the power grid are obtained as follows: Where P represents the active power target, Q represents the reactive power target, V represents the actual voltage output by the power grid, i represents the actual current output by the power grid, t() represents the time processing function, cos(phi) represents the active power factor, sin(phi) represents the reactive power factor, e p Indicates the active power preset rate, e q Indicates the reactive power preset rate, Δ i Indicates the proportion of historical output power corresponding to the i-th time node, a i represents the historical output power corresponding to the i-th time node, and n represents the historical output power of n time nodes in total; Finally, the active and reactive power targets of the power grid are obtained.

5. A method for controlling grid-connected operation of an energy storage bidirectional converter according to claim 4, characterized in that: Configure preset charging strategies, including: According to the active power target and reactive power target of the power grid, the required charging time of the target battery is determined as: Where T represents the charging time required for the target battery, C represents the charge capacity of the target battery, m represents the grid-connected data, and there are m kinds of initial parameters related to frequency. j represents the eigenvalue of the j-th frequency-related parameter, the eigenvalue is obtained using the characteristic matrix, and c0 represents the preset charging target; The charging rate is The preset charging strategy is configured according to the charging time and charging rate.

6. A method for controlling grid-connected operation of an energy storage bidirectional converter according to claim 1, characterized in that: The actual active power and reactive power output of the energy storage system are monitored in real time by sensors, and the grid parameters of the grid after control include: Performing operation configuration on the battery starting device according to a preset charging strategy and executing the operation; Sensors are used to monitor the battery charge of the energy storage system in real time, record all active power and reactive power during the battery charging process, and the actual active power and reactive power after control of the grid parameter data.

7. A method for controlling grid-connected operation of an energy storage bidirectional converter according to claim 6, characterized in that: According to the actual active power and reactive power control output grid parameters and initial parameters, the electric load model is used to analyze and obtain the operating parameters, including: Preprocessing the grid parameters and initial parameter data output after actual active power and reactive power control to obtain standard grid parameter data and standard initial parameter data; Based on the electric load model, the initial parameter data is used as the initial value, the standard power grid parameter data is processed into a power grid parameter sequence of a standard time series, and the operating parameters of the power grid control module are output according to the power grid parameter sequence and the initial value.

8. A method for controlling grid-connected operation of an energy storage bidirectional converter according to claim 7, characterized in that: Use PID control combined with operating parameters to adjust the power grid control module to determine whether the operation of the power grid meets the standards, including: According to the bidirectional regulation threshold of the grid connection, the target value of the operating parameter is formulated, and the operating parameter is processed by the PID control algorithm to obtain the PID coefficient of any operating parameter; All operating parameters are processed using PID coefficients to obtain PID control signals, which are then input into the power grid control module to obtain the final parameters of the power grid operation; If any operating parameter exceeds the safety threshold, the grid protection mechanism is executed. Otherwise, the bidirectional regulation threshold of the grid connection is used to execute the bidirectional regulation switching between the voltage source mode and the current source mode.

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