A power grid side electrochemical energy storage power station energy management system control method

Abstract

The application provides a kind of grid-side electrochemical energy storage power station energy management system control method, it is related to grid-side electrochemical energy storage power station technical field, energy management system includes monitoring host computer, coordination controller and energy storage battery group, control method includes: monitoring host computer receives the power scheduling instruction issued by grid dispatching system, and power scheduling instruction is passed to coordination controller;Wherein, power scheduling instruction includes active scheduling instruction and reactive scheduling instruction;After coordination controller receives power scheduling instruction, generate control rule, and control rule is sorted according to preset priority rule, obtain target rule;Coordination controller executes target rule, obtains initial control result;The state of charge of energy storage battery group is acquired, based on initial control result and the state of charge of energy storage battery group, determine the power distribution demand of energy storage battery group;Based on allocation demand, energy management system is controlled, so that energy storage power station can be efficiently controlled.

Description

A control method for the energy management system of a grid-side electrochemical energy storage power station Technical Field

[0001] This invention relates to the field of grid-side electrochemical energy storage power station technology, and in particular to a control method for an energy management system of a grid-side electrochemical energy storage power station. Background Technology

[0002] With the rapid development of renewable energy and the continuous expansion of power grids, the stability and flexibility of power systems face new challenges. Grid-side electrochemical energy storage power stations, as an important flexibility resource, can effectively alleviate the intermittency and volatility of renewable energy and improve the operating efficiency and stability of the power grid. However, existing energy management systems for energy storage power stations have shortcomings in power dispatch and control strategies, failing to fully consider the state of charge of the energy storage battery packs and the actual needs of the power grid, resulting in low operating efficiency and shortened lifespan of the energy storage power stations.

[0003] Furthermore, traditional energy storage power station energy management systems often lack comprehensive consideration of dynamic reactive power regulation and priority control during the control process. During grid operation, energy storage power stations need to respond quickly to grid dispatch instructions while simultaneously addressing the regulation needs of both active and reactive power. However, existing technologies lack a control method that can effectively coordinate multiple control requirements and optimize the power allocation of energy storage battery packs, thus limiting the application effectiveness and economic benefits of energy storage power stations on the grid side. Summary of the Invention

[0004] This invention provides a control method for the energy management system of a grid-side electrochemical energy storage power station, which solves the technical problem of the inability to efficiently control energy storage power stations in the prior art.

[0005] On one hand, the present invention provides a control method for an energy management system of a grid-side electrochemical energy storage power station, wherein the energy management system includes a monitoring host, a coordination controller, and an energy storage battery pack, and the control method includes:

[0006] The monitoring host receives power dispatch instructions issued by the power grid dispatch system and transmits the power dispatch instructions to the coordination controller; wherein, the power dispatch instructions include active power dispatch instructions and reactive power dispatch instructions;

[0007] After receiving the power scheduling command, the coordination controller generates control rules and sorts the control rules according to a preset priority rule to obtain the target rule.

[0008] The coordination controller executes the target rule to obtain the initial control result;

[0009] The state of charge of the energy storage battery pack is obtained, and the power allocation requirements of the energy storage battery pack are determined based on the initial control results and the state of charge of the energy storage battery pack.

[0010] The energy management system is controlled based on the aforementioned allocation requirements.

[0011] According to a grid-side electrochemical energy storage power station energy management system control method provided by the present invention, when the coordination controller executes the target rule, dynamic reactive power voltage regulation control is also performed, including:

[0012] Determine the voltage difference between the rated voltage and the voltage regulation dead zone at the grid connection point, as well as the cumulative voltage between the rated voltage and the voltage regulation dead zone;

[0013] When the actual voltage at the grid connection point is less than the voltage difference, the reactive power output of the energy storage power station is increased.

[0014] When the actual voltage at the grid connection point is greater than the accumulated voltage value, the reactive power output of the energy storage power station is reduced.

[0015] According to the present invention, a control method for an energy management system of a grid-side electrochemical energy storage power station is provided, wherein when the actual voltage at the grid connection point is less than the voltage difference, the reactive power output of the energy storage power station is increased, comprising the following formula:

[0016] The reduction of reactive power output by the energy storage power station when the actual voltage at the grid connection point is greater than the accumulated voltage value includes the following formula:

[0017] Where Q is the reactive power output of the energy storage power station, Q0 is the current reactive power output of the energy storage power station, U is the actual voltage at the grid connection point, ΔU is the voltage regulation dead zone, and U N The rated voltage of the grid connection point. This represents the system impedance.

[0018] According to the present invention, a control method for an energy management system of a grid-side electrochemical energy storage power station is provided, wherein the preset priority rule includes at least one of the following:

[0019] Source-grid-load terminal control takes precedence over primary frequency regulation control, including: during source-grid-load terminal control, blocking primary frequency regulation control and AGC steady-state control;

[0020] Primary frequency control takes precedence over AGC steady-state control, including: when the power adjustment directions of primary frequency control and AGC steady-state control are inconsistent, primary frequency control is executed first, and AGC steady-state control is blocked; when the power adjustment directions of primary frequency control and AGC steady-state control are consistent, a comprehensive incremental regulation mode is implemented.

[0021] Dynamic reactive power regulation control takes precedence over AVC steady-state control, including: during the execution of dynamic reactive power regulation control, blocking AVC steady-state control.

[0022] According to the present invention, a control method for an energy management system of a grid-side electrochemical energy storage power station is provided, wherein when the power adjustment direction of the primary frequency regulation control and the AGC steady-state control are consistent, a comprehensive incremental regulation mode is implemented, including:

[0023] Monitor the grid frequency deviation and AGC commands issued by the grid dispatch system, and determine the deviation between the current active power output of the energy storage power station and the AGC commands;

[0024] When primary frequency control requires an increase in power and AGC steady-state control also requires an increase in power, or when primary frequency control requires a decrease in power and AGC steady-state control also requires a decrease in power, the power adjustment direction is determined to be consistent.

[0025] The power adjustment increment required for primary frequency regulation and the power adjustment increment required for AGC steady-state control are added together to obtain the comprehensive power adjustment increment;

[0026] Based on the comprehensive power adjustment increment, the power allocation for each energy storage battery pack is determined.

[0027] According to a control method for an energy management system of a grid-side electrochemical energy storage power station provided by the present invention, the step of determining the power allocation requirements of the energy storage battery pack based on the initial control results and the state of charge of the energy storage battery pack includes:

[0028] Based on the state of charge (SOC) of each of the energy storage battery packs, the power allocation requirement for each of the energy storage battery packs is determined; wherein the power allocation requirement is proportional to the SOC.

[0029] According to the present invention, a control method for an energy management system of a grid-side electrochemical energy storage power station is provided, wherein determining the power allocation requirements of each of the energy storage battery packs based on the state of charge of each of the energy storage battery packs includes:

[0030] The state of charge (SOC) of each energy storage battery pack is normalized, and its weighting coefficient is calculated. The weighting coefficient is proportional to the SOC, and the calculation formula is shown below:

[0031] Among them, W i This represents the weighting coefficient of the i-th energy storage battery pack, where N is the total number of energy storage battery packs, and SOC is the weighting coefficient. i Let SOC represent the state of charge (SOC) of the i-th energy storage battery pack, where j is the number of energy storage battery packs. j The state of charge of the j-th energy storage battery pack;

[0032] Based on the overall power adjustment increment and the weighting coefficient of each energy storage battery pack, the allocated power of each energy storage battery pack is calculated, as shown in the following formula:

[0033] ; where ΔP total For the overall power adjustment increment, P i This represents the allocated power of the i-th energy storage battery pack;

[0034] Check whether the allocated power of each energy storage battery pack is within its preset charging and discharging power range. If it exceeds the preset charging and discharging power range, adjust the allocated power to bring it within the preset charging and discharging power range. If the state of charge of the energy storage battery pack is lower than the first preset charge threshold, limit its discharge power. If the state of charge is higher than the second preset charge threshold, limit its charging power. The second preset charge threshold is greater than the first preset charge threshold.

[0035] According to the energy management system control method of the grid-side electrochemical energy storage power station provided by the present invention, after normalizing the state of charge of each energy storage battery pack and calculating its weighting coefficient, the method further includes:

[0036] Monitor the current capacity and ambient temperature of the energy storage battery pack;

[0037] The weighting coefficients of the energy storage battery pack are optimized based on the current capacity and the current ambient temperature.

[0038] According to the present invention, a control method for an energy management system of a grid-side electrochemical energy storage power station, wherein optimizing the weighting coefficients of the energy storage battery pack based on the current capacity and the current ambient temperature includes:

[0039] Calculate the capacity difference between the initial capacity and the current capacity of the energy storage battery pack, and determine the ratio of the capacity difference to the initial capacity as a health status score;

[0040] Determine the absolute value of the temperature difference between the current ambient temperature and the preset rated temperature of the energy storage battery pack, and calculate the temperature ratio of this absolute value to the preset temperature range. Subtract the temperature ratio from 1 to obtain the correction coefficient for the health status score.

[0041] Multiply the correction factor by the health status score to obtain the health correction value;

[0042] Based on the aforementioned health correction value, the weighting coefficients of the energy storage battery pack are optimized.

[0043] According to the control method of the energy management system of the grid-side electrochemical energy storage power station provided by the present invention, the formula for health status scoring is as follows:

[0044] Among them, SOH_scorei Rate your health status, Capacity initial For the initial capacity, Capacity current Current capacity;

[0045] The formula for the adjusted health status score is shown below:

[0046] Where T is the current ambient temperature, T nominal For the preset rated temperature, T range For the preset temperature range, Adjusted health status score;

[0047] The formula for the weighting coefficients of the optimized energy storage battery pack is shown below:

[0048] ;in, The adjusted health status score for the j-th energy storage battery pack. The optimized weighting coefficients for the energy storage battery pack.

[0049] This invention provides a control method for the energy management system of a grid-side electrochemical energy storage power station. The method involves receiving grid dispatch instructions from a monitoring host and transmitting them to a coordination controller. The coordination controller generates and executes control rules based on preset priority rules and determines power allocation requirements by combining the state of charge of the energy storage battery pack. This achieves precise control of the energy management system, effectively coordinating grid dispatch instructions with the actual state of the energy storage battery pack, optimizing power allocation, improving the operating efficiency and response speed of the energy storage power station, and extending the service life of the energy storage battery pack. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0051] Figure 1 is a flowchart illustrating the control method of the power grid-side electrochemical energy storage power station energy management system provided in an embodiment of the present invention;

[0052] Figure 2 is a logic diagram of active power control of an electrochemical energy storage power station provided in an embodiment of the present invention;

[0053] Figure 3 is a logic diagram of reactive power control of an electrochemical energy storage power station provided in an embodiment of the present invention;

[0054] Figure 4 is a schematic diagram of the structure of the control device of the power management system of the grid-side electrochemical energy storage power station provided in an embodiment of the present invention;

[0055] Figure 5 is a schematic diagram of the structure of the electronic device provided in an embodiment of the present invention. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0057] Figure 1 is a flowchart illustrating the control method for the energy management system of a grid-side electrochemical energy storage power station provided in an embodiment of the present invention. The execution subject of this method can be a computer, tablet computer, etc.

[0058] An energy management system may include a monitoring host, a coordination controller, and energy storage battery packs. The monitoring host serves as the communication bridge between the entire energy management system and the power grid dispatching system. Its primary responsibility is to receive power dispatching instructions from the power grid dispatching system and transmit them to the coordination controller. The monitoring host performs many functions, including: receiving instructions (obtaining active and reactive power dispatching instructions from the power grid dispatching system); transmitting instructions (accurately transmitting received dispatching instructions to the coordination controller, ensuring the timeliness and accuracy of the instructions); and monitoring (monitoring the overall operating status of the energy storage power station in real time, providing necessary operational data support for the system).

[0059] The coordination controller is the core control unit of the energy management system. It is responsible for processing and executing dispatch commands and allocating and controlling power to the energy storage battery packs according to preset rules. Its main functions include: generating control rules: generating specific control rules based on the received power dispatch commands; prioritizing: sorting the control rules according to preset priority rules to determine the final target rule to be executed; executing control: executing the target rule, generating initial control results, and further optimizing power allocation by combining the state of charge (SOC) of the energy storage battery packs; and dynamic adjustment: during execution, the coordination controller can also perform dynamic reactive power voltage regulation control according to the actual needs of the power grid to optimize the voltage stability of the power grid.

[0060] Energy storage battery packs are the energy storage and output units of energy storage power stations. They are responsible for charging and discharging operations according to the instructions of the coordinating controller to meet the power demand of the power grid. Their main functions include: energy storage: when the power grid has surplus power, the energy storage battery pack absorbs energy to charge; power output: when the power grid needs power, the energy storage battery pack releases energy to discharge, providing active and reactive power support; and state feedback: in real time, it feeds back its own state of charge (SOC), state of health (SOH), and other information to the coordinating controller so that the coordinating controller can make reasonable power allocation according to the actual situation.

[0061] Referring to Figure 1, the control method of the energy management system of the grid-side electrochemical energy storage power station may include the following steps.

[0062] Step 101: The monitoring host receives the power dispatching instructions issued by the power grid dispatching system and transmits the power dispatching instructions to the coordination controller. The power dispatching instructions may include active power dispatching instructions and reactive power dispatching instructions.

[0063] In this step, for example, suppose the power grid dispatch system detects a sudden increase in electricity load in a certain area, requiring the energy storage power station to provide additional active power support. The power grid dispatch system issues a power dispatch instruction stating, "Increase active power output by 100kW, while keeping reactive power output unchanged." After receiving this instruction, the monitoring host transmits it completely to the coordination controller.

[0064] Step 102: After receiving the power scheduling command, the coordinating controller generates control rules and sorts the control rules according to the preset priority rules to obtain the target rules.

[0065] In this step, for example, after the coordinating controller receives the instruction to "increase active power by 100kW", it first generates control rules. Assume that the current control rules for the energy storage power station may include the following:

[0066] Primary frequency regulation control; steady-state control of Automatic Generation Control (AGC); dynamic reactive power regulation control.

[0067] Based on preset priority rules (such as "primary frequency control takes precedence over AGC steady-state control"), the coordinating controller sorts these rules and finally determines the target rule.

[0068] Step 103: The coordinating controller executes the target rules to obtain the initial control results.

[0069] In this step, for example, the coordination controller calculates the increase in active power to be allocated to the energy storage battery banks according to the "primary frequency regulation control" rule. Assume the energy storage power station has 5 battery banks, each with an initial power of 20kW. To meet the 100kW active power demand, the coordination controller decides to increase the power of each battery bank by 20kW (20kW + 20kW = 40kW). Initial control result: The power of each battery bank increases from 20kW to 40kW, for a total increase of 100kW.

[0070] Step 104: Obtain the state of charge of the energy storage battery pack. Based on the initial control results and the state of charge of the energy storage battery pack, determine the power allocation requirements of the energy storage battery pack.

[0071] In this step, for example, before executing the initial control results, the coordinating controller obtains the state of charge (SOC) of each energy storage battery group. Assume the SOC of the five energy storage battery groups are as follows:

[0072] Battery 1: SOC = 80%;

[0073] Battery 2: SOC=70%;

[0074] Battery 3: SOC=60%;

[0075] Battery 4: SOC=90%;

[0076] Battery 5: SOC=50%;

[0077] According to preset rules, for example, power is preferentially allocated to battery packs with a SOC higher than 60%. Therefore, batteries 1, 2, and 4 are selected as priority allocation targets.

[0078] Step 105: Control the energy management system based on allocation needs.

[0079] In this step, based on the allocation requirements from the previous step, the coordinating controller readjusts the power allocation for each battery group. Let's assume the adjusted allocation scheme is as follows:

[0080] Battery 1: Increased by 34kW (power increased from 20kW to 54kW);

[0081] Battery 2: Increased by 30kW (power increased from 20kW to 50kW);

[0082] Battery 4: Increased by 36kW (power increased from 20kW to 56kW);

[0083] Batteries 3 and 5 are not included in this power increase due to their lower SOC.

[0084] Ultimately, the total power of the energy storage station increased by 100kW (25kW increase for each of the three battery groups).

[0085] In this embodiment, the monitoring host receives grid dispatch instructions and transmits them to the coordination controller. The coordination controller generates and executes control rules according to preset priority rules, and determines the power allocation requirements by combining the state of charge of the energy storage battery pack. This achieves precise control of the energy management system, effectively coordinates grid dispatch instructions with the actual state of the energy storage battery pack, optimizes power allocation, improves the operating efficiency and response speed of the energy storage power station, and extends the service life of the energy storage battery pack.

[0086] In one embodiment of this specification, when the coordinating controller executes the target rule, dynamic reactive power regulation control is also performed, which may include:

[0087] Determine the voltage difference between the rated voltage and the voltage regulation dead zone at the grid connection point, as well as the cumulative voltage between the rated voltage and the voltage regulation dead zone;

[0088] When the actual voltage at the grid connection point is less than the voltage difference, increase the reactive power output of the energy storage power station;

[0089] When the actual voltage at the grid connection point is greater than the accumulated voltage value, the reactive power output of the energy storage power station is reduced.

[0090] In this embodiment, a dynamic reactive power voltage regulation control function is introduced when the coordinating controller executes the target rules. This function can dynamically adjust the reactive power output of the energy storage power station based on the voltage difference or accumulated value between the actual voltage at the grid connection point and the voltage dead zone. This technology can effectively improve the voltage stability of the power grid, reduce the impact of voltage fluctuations on grid equipment and users, and improve the overall operating quality of the power grid.

[0091] In one embodiment of this specification, when the actual voltage at the grid connection point is less than the voltage difference, increasing the reactive power output of the energy storage power station may include the following formula (1):

[0092] (1);

[0093] When the actual voltage at the grid connection point is greater than the accumulated voltage value, the reactive power output of the energy storage power station is reduced, including the following formula (2):

[0094] (2);

[0095] Where Q is the reactive power output of the energy storage power station, Q0 is the current reactive power output of the energy storage power station, U is the actual voltage at the grid connection point, ΔU is the voltage regulation dead zone, and U N The rated voltage of the grid connection point. This represents the system impedance.

[0096] In this embodiment, the reactive power adjustment amount output by the energy storage power station is accurately calculated to ensure that the reactive power regulation is more scientific and accurate. This quantitative control method can further optimize the dynamic reactive power voltage regulation process, improve the response speed and control accuracy of the energy storage power station in voltage regulation, and enhance the reactive power regulation capability of the power grid.

[0097] In one embodiment of this specification, the preset priority rule may include at least one of the following:

[0098] Source-grid-load terminal control takes precedence over primary frequency regulation control, including: during source-grid-load terminal control, blocking primary frequency regulation control and AGC steady-state control;

[0099] Primary frequency control takes precedence over AGC steady-state control, including: when the power adjustment directions of primary frequency control and AGC steady-state control are inconsistent, primary frequency control is executed first, and AGC steady-state control is blocked; when the power adjustment directions of primary frequency control and AGC steady-state control are consistent, a comprehensive incremental regulation mode is implemented.

[0100] Dynamic reactive power regulation takes precedence over the steady-state control of Automatic Voltage Control (AVC), including: blocking AVC steady-state control during the execution of dynamic reactive power regulation.

[0101] In this embodiment, multiple preset priority rules are introduced to clarify the priority relationships among source-grid-load terminal control, primary frequency regulation control, AGC steady-state control, and dynamic reactive power voltage regulation control. This priority mechanism ensures that in complex grid operation scenarios, the energy management system of the energy storage power station can rationally allocate control tasks according to the actual needs of the grid, avoid control conflicts, and improve the stability and reliability of the system.

[0102] In one embodiment of this specification, when the power adjustment direction of primary frequency modulation control and AGC steady-state control is consistent, implementing a comprehensive incremental regulation mode may include:

[0103] Monitor the grid frequency deviation and AGC commands issued by the grid dispatch system, and determine the deviation between the current active power output of the energy storage power station and the AGC commands;

[0104] When primary frequency control requires an increase in power and AGC steady-state control also requires an increase in power, or when primary frequency control requires a decrease in power and AGC steady-state control also requires a decrease in power, the power adjustment direction is determined to be consistent.

[0105] The power adjustment increment required for primary frequency regulation and the power adjustment increment required for AGC steady-state control are added together to obtain the comprehensive power adjustment increment;

[0106] Based on the comprehensive power adjustment increment, the power allocation of each energy storage battery pack is determined.

[0107] In this embodiment, when the power adjustment directions of primary frequency regulation control and AGC steady-state control are consistent, a comprehensive incremental regulation mode is implemented. The power adjustment increments required by the two control methods are added together to obtain a comprehensive power adjustment increment, which is then used to allocate the power of the energy storage battery pack. This method can fully utilize the synergistic effect of primary frequency regulation and AGC steady-state control to optimize the active power output of the energy storage power station and improve the efficiency and accuracy of grid frequency regulation.

[0108] In one embodiment of this specification, determining the power allocation requirements of the energy storage battery pack based on the initial control results and the state of charge of the energy storage battery pack may include:

[0109] Based on the state of charge (SOC) of each energy storage battery pack, the power allocation requirements for each energy storage battery pack are determined; whereby the power allocation requirements are directly proportional to the SOC.

[0110] In this embodiment, the power allocation requirement is proportional to the state of charge. This strategy can rationally allocate power according to the actual energy state of the energy storage battery pack, avoid overcharging and discharging, extend the service life of the energy storage battery pack, and improve the energy utilization efficiency of the energy storage power station.

[0111] In one embodiment of this specification, determining the power allocation requirements of each energy storage battery pack based on the state of charge of each battery pack may include:

[0112] The state of charge (SOC) of each energy storage battery pack is normalized, and its weighting coefficient is calculated. The weighting coefficient is proportional to the SOC, and the calculation formula is shown in formula (3) below:

[0113] (3); where W i This represents the weighting coefficient of the i-th energy storage battery pack, where N is the total number of energy storage battery packs, and SOC is the weighting coefficient. i Let SOC be the state of charge (SOC) of the i-th energy storage battery pack, and j be the state of charge (SOC) of the j-th energy storage battery pack. j The state of charge of the j-th energy storage battery pack;

[0114] Based on the comprehensive power adjustment increment and the weighting coefficient of each energy storage battery pack, the power allocation of each energy storage battery pack is calculated. The calculation formula is shown in formula (4) below:

[0115] (4); where ΔP total For the overall power adjustment increment, P i This represents the allocated power of the i-th energy storage battery pack;

[0116] Check whether the allocated power of each energy storage battery pack is within its preset charging and discharging power range. If it exceeds the preset charging and discharging power range, adjust the allocated power to bring it within the preset charging and discharging power range. If the state of charge of the energy storage battery pack is lower than the first preset charge threshold (e.g., 20%), limit its discharge power. If the state of charge is higher than the second preset charge threshold (e.g., 90%), limit its charging power. The second preset charge threshold is greater than the first preset charge threshold.

[0117] In this embodiment, the power allocation strategy is further optimized by normalizing the state of charge of the energy storage battery packs and calculating weighting coefficients. This method can dynamically adjust the power allocation according to the actual state of each energy storage battery pack, ensuring that each energy storage battery pack operates within its safe charge and discharge range, while improving the overall operating efficiency and reliability of the energy storage power station.

[0118] In one embodiment of this specification, after normalizing the state of charge of each energy storage battery pack and calculating its weighting coefficient, the method may further include:

[0119] Monitor the current capacity and ambient temperature of the energy storage battery pack;

[0120] The weighting coefficients of the energy storage battery pack are optimized based on the current capacity and the current ambient temperature.

[0121] In this embodiment, a monitoring and optimization mechanism for current capacity and ambient temperature is introduced into the calculation of the weighting coefficients of the energy storage battery pack. This mechanism can dynamically adjust the weighting coefficients based on the actual health status and operating environment of the energy storage battery pack. This optimization strategy further improves the scientific nature and adaptability of power allocation, ensuring that the energy storage battery pack can operate efficiently under different operating conditions and extending its service life.

[0122] In one embodiment of this specification, the weighting coefficients for optimizing the energy storage battery pack based on the current capacity and the current ambient temperature may include:

[0123] Calculate the capacity difference between the initial capacity and the current capacity of the energy storage battery pack, and determine the ratio of the capacity difference to the initial capacity as a health status score;

[0124] Determine the absolute value of the temperature difference between the current ambient temperature and the preset rated temperature of the energy storage battery pack, and calculate the temperature ratio of this absolute value to the preset temperature range. Subtract the temperature ratio from 1 to obtain the correction coefficient for the health status score.

[0125] Multiply the correction factor by the health status score to obtain the health correction value;

[0126] Based on the aforementioned health correction value, the weighting coefficients of the energy storage battery pack are optimized.

[0127] In this embodiment, the calculation method for the weighting coefficients is further optimized by calculating the health status score of the energy storage battery pack and its correction coefficient. This technology can more accurately reflect the health status of the energy storage battery pack, thereby fully considering the health factors of the battery in power allocation, further improving the operating efficiency and reliability of the energy storage power station, and extending the service life of the energy storage battery pack.

[0128] In one embodiment of this specification, the formula for health status scoring is shown in formula (5) below:

[0129] (5); where SOH_score i Rate your health status, Capacity initial For the initial capacity, Capacity current Current capacity;

[0130] The formula for the adjusted health status score is shown in formula (6) below:

[0131] (6); where T is the current ambient temperature, T nominal For the preset rated temperature, T range For the preset temperature range, Adjusted health status score;

[0132] The formula for the weighting coefficient of the optimized energy storage battery pack is shown in formula (7) below:

[0133] (7); among which, The adjusted health status score for the j-th energy storage battery pack. The optimized weighting coefficients for the energy storage battery pack.

[0134] This embodiment provides a specific quantitative method for assessing the health status and allocating power to energy storage battery packs. This precise calculation method ensures that the energy storage battery pack maintains the optimal power allocation strategy during dynamic operation, further improving the overall performance and economic benefits of the energy storage power station. It can be understood that the absolute value of subtracting the preset rated temperature from the current ambient temperature is always less than the preset temperature range, thus ensuring the ratio is less than 1. The preset temperature range and preset rated temperature can be obtained from historical experience data and can be set; no specific limitations are made here. For example, if the preset temperature range is 30 degrees Celsius, the preset rated temperature is 20 degrees Celsius, the ambient temperature fluctuation range is generally 5-45 degrees Celsius, and the current ambient temperature is 15 degrees Celsius, then the difference between the two, and the absolute value, is 5.

[0135] Figure 2 is a logical schematic diagram of the active power control of the electrochemical energy storage power station provided in an embodiment of the present invention. The power grid dispatching system is responsible for formulating overall active power dispatching instructions based on the power grid's demand and operating status, and issuing them to the energy storage EMS system.

[0136] An energy storage EMS (Energy Management System for Energy Storage) receives instructions from the power grid dispatch system and further processes and controls them based on the actual operating conditions of the energy storage power station. For example: Actual active power value: The energy storage EMS monitors and records the current actual active power output value of the energy storage power station. Adjustment cycle: The energy storage EMS adjusts the active power output periodically or as needed according to a set adjustment cycle. AGC (Active Gain Control) module: Generates control rules based on power grid dispatch instructions and the actual operating conditions of the energy storage power station. Optimized control strategy: The AGC control module formulates optimized control strategies to ensure that the active power output of the energy storage power station meets grid demand while optimizing the operating efficiency of the energy storage power station.

[0137] Active power regulation command issuance: The energy storage EMS system issues optimized active power regulation commands to the coordination and control system.

[0138] Coordinated Control System: Responsible for receiving active power regulation commands from the energy storage EMS system and distributing them to individual energy storage systems. For example, Source-Grid-Load Terminal Control: A function within the coordinated control system used to control the terminals of the power source, grid, and load to achieve active power balance. PCC Voltage and Frequency: Refers to the voltage and frequency of the point of common coupling (PCC), a crucial parameter for grid operation. Primary Frequency Regulation Module: Responsible for primary frequency regulation based on grid frequency changes, i.e., rapidly responding to grid frequency fluctuations and adjusting active power output. Composite Power Control Command: The coordinated control system generates the final power control command based on the output of the primary frequency regulation module and the AGC control command.

[0139] The active power value of each energy storage system is allocated according to its output capacity: The coordinated control system distributes the synthesized power control command to each energy storage system (such as energy storage system 1, energy storage system 2, energy storage system 3, energy storage system N, etc.) based on the output capacity of each energy storage system (i.e., the capacity and current status of each energy storage system) to ensure the reasonable allocation of active power.

[0140] Figure 3 is a logical schematic diagram of reactive power control in an electrochemical energy storage power station provided in an embodiment of the present invention. Referring to Figure 3, the power grid dispatching system is responsible for formulating overall reactive power dispatching instructions based on the power grid's demand and operating status. The power grid dispatching system then issues the formulated overall reactive power dispatching instructions to the energy storage EMS system.

[0141] The energy storage EMS (Energy Management System) receives instructions from the power grid dispatch system and further processes and controls them based on the actual operating conditions of the energy storage power station. For example, the EMS monitors and records the actual reactive power output of the energy storage power station. It also adjusts the reactive power output periodically or as needed according to a set adjustment cycle. The Automatic Voltage Control (AVC) module generates control rules based on the power grid dispatch instructions and the actual operating conditions of the energy storage power station. Finally, the AVC module formulates optimized control strategies to ensure that the reactive power output of the energy storage power station meets grid demand while optimizing the station's operating efficiency. The EMS then sends the optimized reactive power adjustment instructions to the coordination and control system.

[0142] The coordinated control system is responsible for receiving reactive power regulation commands from the energy storage EMS system and distributing them to the various specific energy storage systems. For example, PCC voltage refers to the voltage at the point of common coupling (PCC), a crucial parameter for grid operation. The fast voltage regulation module is responsible for rapidly adjusting the voltage based on grid voltage changes, i.e., quickly responding to grid voltage fluctuations and adjusting reactive power output. The coordinated control system generates the final reactive power control command based on the output of the fast voltage regulation module and the AVC control command.

[0143] The reactive power value of each energy storage system is allocated according to its output capacity: The coordinated control system distributes the synthesized reactive power control command to each energy storage system (such as energy storage system 1, energy storage system 2, energy storage system 3, energy storage system N, etc.) according to the output capacity of each energy storage system (i.e., the capacity and current status of each energy storage system) to ensure the reasonable allocation of reactive power.

[0144] In some other embodiments of this specification, the control method may further include:

[0145] Adaptive learning algorithm: The coordination controller further includes an adaptive learning algorithm for learning the patterns of grid dispatch commands and the response characteristics of energy storage battery packs to optimize the generation of control rules and power allocation strategies.

[0146] Predictive Model Integration: The adaptive learning algorithm integrates predictive models to predict grid load and renewable energy output based on historical and real-time data, thereby achieving more accurate power scheduling and allocation.

[0147] Online update mechanism: The adaptive learning algorithm has an online update mechanism, which can adjust the learning model and control strategy in real time according to the latest power grid operation data and energy storage battery pack status.

[0148] In this embodiment, the adaptive learning algorithm may include reinforcement learning (RL), neural networks, and support vector machines (SVM), etc. The prediction model may include machine learning regression models and deep learning forecasting models, etc.

[0149] In some other embodiments of this specification, the control method may further include:

[0150] Distributed Coordination Control: The energy management system adopts a distributed coordination control architecture, in which each energy storage battery pack is equipped with an independent control unit. These control units can autonomously perform power allocation and adjustment based on global control objectives and local battery status information.

[0151] Wireless communication network: The distributed coordination control architecture uses a wireless communication network to enable information exchange between the control units of each energy storage battery pack and the coordination controller, thereby improving the system's flexibility and scalability.

[0152] Fault tolerance mechanism: The distributed coordination control system has fault tolerance capability. When the control unit of a certain energy storage battery pack fails, other control units can automatically take over its function to ensure the stable operation of the entire energy storage system.

[0153] Based on the same general inventive concept, this invention also protects a control device for the energy management system of a grid-side electrochemical energy storage power station, as shown in Figure 4. Figure 4 is a schematic diagram of the structure of the control device for the energy management system of a grid-side electrochemical energy storage power station provided in an embodiment of this invention. The control device for the energy management system of a grid-side electrochemical energy storage power station provided by this invention will be described below. The control device for the energy management system of a grid-side electrochemical energy storage power station described below can be referred to in correspondence with the control method for the energy management system of a grid-side electrochemical energy storage power station described above.

[0154] The control device of the grid-side electrochemical energy storage power station energy management system includes a monitoring module 401, a rule generation module 402, an initial result generation module 403, an allocation demand module 404, and a control module 405.

[0155] The monitoring module 401 is used to receive power dispatch instructions issued by the power grid dispatch system through the monitoring host, and to transmit the power dispatch instructions to the coordination controller; wherein, the power dispatch instructions include active power dispatch instructions and reactive power dispatch instructions;

[0156] The rule generation module 402 is used to generate control rules after receiving the power scheduling instruction through the coordination controller, and sort the control rules according to the preset priority rules to obtain the target rules;

[0157] The initial result generation module 403 is used to execute the target rule through the coordination controller to obtain the initial control result;

[0158] The allocation demand module 404 is used to obtain the state of charge of the energy storage battery pack and determine the power allocation demand of the energy storage battery pack based on the initial control results and the state of charge of the energy storage battery pack.

[0159] The control module 405 is used to control the energy management system based on the allocation requirements.

[0160] Figure 5 is a schematic diagram of the electronic device provided in an embodiment of the present invention. As shown in Figure 5, the electronic device may include: a processor 510, a communication interface 520, a memory 530, and a communication bus 540, wherein the processor 510, the communication interface 520, and the memory 530 communicate with each other through the communication bus 540. The processor 510 can call logical instructions in the memory 530 to execute the control method of the grid-side electrochemical energy storage power station energy management system.

[0161] Furthermore, the logical instructions in the aforementioned memory 530 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0162] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the grid-side electrochemical energy storage power station energy management system control method provided by the above methods.

[0163] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the grid-side electrochemical energy storage power station energy management system control method provided by the above methods.

[0164] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0165] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0166] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for an energy management system of a grid-side electrochemical energy storage power station, wherein the energy management system includes a monitoring host, a coordination controller, and an energy storage battery pack, characterized in that, The control method includes: the monitoring host receiving a power dispatch instruction issued by the power grid dispatch system and transmitting the power dispatch instruction to the coordination controller; wherein, the power dispatch instruction includes active power dispatch instructions and reactive power dispatch instructions; after receiving the power dispatch instruction, the coordination controller generates control rules and sorts the control rules according to a preset priority rule to obtain target rules; wherein, the preset priority rule includes at least one of the following: source-grid-load terminal control takes precedence over primary frequency regulation control, including: during source-grid-load terminal control, blocking primary frequency regulation control and AGC steady-state control; primary frequency regulation control takes precedence over AGC steady-state control, including: when primary frequency regulation control takes precedence over AGC steady-state control... When the power adjustment directions of frequency regulation control and AGC steady-state control are inconsistent, primary frequency regulation control is executed first, and AGC steady-state control is locked. When the power adjustment directions of primary frequency regulation control and AGC steady-state control are consistent, a comprehensive incremental regulation mode is implemented. Dynamic reactive power regulation control takes precedence over AGC steady-state control, including: locking AGC steady-state control during the execution of dynamic reactive power regulation control; the coordination controller executes the target rule to obtain the initial control result; the state of charge of the energy storage battery pack is obtained, and based on the initial control result and the state of charge of the energy storage battery pack, the power allocation requirement of the energy storage battery pack is determined; and the energy management system is controlled based on the allocation requirement.

2. The control method for the energy management system of a grid-side electrochemical energy storage power station according to claim 1, characterized in that, When the coordinating controller executes the target rule, it also performs dynamic reactive power regulation control, including: determining the voltage difference between the rated voltage of the grid connection point and the voltage dead zone, and the cumulative voltage value between the rated voltage and the voltage dead zone; when the actual voltage of the grid connection point is less than the voltage difference, increasing the reactive power output of the energy storage station; when the actual voltage of the grid connection point is greater than the cumulative voltage value, decreasing the reactive power output of the energy storage station.

3. The control method for the energy management system of a grid-side electrochemical energy storage power station according to claim 2, characterized in that, When the actual voltage at the grid connection point is less than the voltage difference, the reactive power output of the energy storage power station is increased, including the following formula: The reduction of reactive power output by the energy storage power station when the actual voltage at the grid connection point is greater than the accumulated voltage value includes the following formula: Where Q is the reactive power output of the energy storage power station, Q0 is the current reactive power output of the energy storage power station, U is the actual voltage at the grid connection point, ΔU is the voltage regulation dead zone, and U N The rated voltage of the grid connection point. This represents the system impedance.

4. The control method for the energy management system of a grid-side electrochemical energy storage power station according to claim 1, characterized in that, When the power adjustment directions of primary frequency regulation control and AGC steady-state control are consistent, a comprehensive incremental regulation mode is implemented, including: monitoring the grid frequency deviation and the AGC command issued by the grid dispatch system, and determining the deviation between the current active power output of the energy storage power station and the AGC command; when primary frequency regulation control needs to increase power and AGC steady-state control also needs to increase power, or primary frequency regulation control needs to decrease power and AGC steady-state control also needs to decrease power, the power adjustment direction is determined to be consistent; the power adjustment increment required by primary frequency regulation and the power adjustment increment required by AGC steady-state control are added together to obtain the comprehensive power adjustment increment; based on the comprehensive power adjustment increment, the power allocation of each energy storage battery pack is determined.

5. The control method for the energy management system of a grid-side electrochemical energy storage power station according to claim 1, characterized in that, The step of determining the power allocation requirement of the energy storage battery pack based on the initial control results and the state of charge of the energy storage battery pack includes: determining the power allocation requirement of each energy storage battery pack based on the magnitude of the state of charge of each energy storage battery pack; wherein the power allocation requirement is proportional to the magnitude of the state of charge.

6. The control method for the energy management system of a grid-side electrochemical energy storage power station according to claim 5, characterized in that, The step of determining the power allocation requirements of each energy storage battery pack based on the state of charge (SOC) of each battery pack includes: normalizing the SOC of each battery pack and calculating its weighting coefficient; wherein the weighting coefficient is proportional to the SOC, and the calculation formula is as follows: Among them, W i This represents the weighting coefficient of the i-th energy storage battery pack, where N is the total number of energy storage battery packs, and SOC is the weighting coefficient. i Let SOC represent the state of charge (SOC) of the i-th energy storage battery pack, where j is the number of energy storage battery packs. j Let j be the state of charge of the j-th energy storage battery pack. Based on the comprehensive power adjustment increment and the weighting coefficient of each energy storage battery pack, the allocated power of each energy storage battery pack is calculated using the following formula: ; where ΔP total For the overall power adjustment increment, P i This represents the allocated power of the i-th energy storage battery pack. The system checks whether the allocated power of each energy storage battery pack is within its preset charging / discharging power range. If it exceeds the preset charging / discharging power range, the allocated power is adjusted to be within the preset charging / discharging power range. Specifically, if the state of charge of an energy storage battery pack is lower than a first preset charge threshold, its discharge power is limited; if the state of charge is higher than a second preset charge threshold, its charging power is limited. The second preset charge threshold is greater than the first preset charge threshold.

7. The control method for the energy management system of a grid-side electrochemical energy storage power station according to claim 6, characterized in that, After normalizing the state of charge of each energy storage battery pack and calculating its weighting coefficient, the method further includes: monitoring the current capacity and current ambient temperature of the energy storage battery pack; and optimizing the weighting coefficient of the energy storage battery pack based on the current capacity and the current ambient temperature.

8. The control method for the energy management system of a grid-side electrochemical energy storage power station according to claim 7, characterized in that, The optimization of the weighting coefficients of the energy storage battery pack based on the current capacity and the current ambient temperature includes: calculating the capacity difference between the initial capacity and the current capacity of the energy storage battery pack, determining the ratio of the capacity difference to the initial capacity as a health status score; determining the absolute value of the temperature difference between the current ambient temperature and the preset rated temperature of the energy storage battery pack, and calculating the ratio of this absolute value to the temperature range of the preset temperature range, subtracting the temperature ratio from 1 to obtain a correction coefficient for the health status score; multiplying the correction coefficient by the health status score to obtain a health correction value; and optimizing the weighting coefficients of the energy storage battery pack based on the health correction value.

9. The control method for the energy management system of a grid-side electrochemical energy storage power station according to claim 8, characterized in that, The formula for the health status score is as follows: Among them, SOH_score i Rate your health status, Capacity initial For the initial capacity, Capacity current Given the current capacity; the formula for the adjusted health status score is as follows: Where T is the current ambient temperature, T nominal For the preset rated temperature, T range For the preset temperature range, The adjusted health status score; the formula for the optimized weighting coefficients of the energy storage battery pack is shown below: ;in, The adjusted health status score for the j-th energy storage battery pack. The optimized weighting coefficients for the energy storage battery pack.

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