AGC frequency modulation control system and method for hybrid energy storage coupling unit

Abstract

The invention provides a hybrid energy storage coupling unit AGC frequency modulation control system and method, and belongs to the field of power system frequency modulation control. Specifically, the method comprises the steps of receiving an AGC regulation instruction issued by a power grid dispatching center and a load fluctuation condition of a power grid; according to the load fluctuation condition of the power grid and the AGC adjustment instruction, calculating a total adjustment power target value needing to be adjusted; according to the total adjustment power target value needing to be adjusted, determining the energy storage subsystems participating in adjustment and the operation target power and the charge state corresponding to the energy storage subsystems participating in adjustment; according to the charge state of the energy storage subsystem participating in adjustment, calculating the sustainable working time of the energy storage subsystem, and redistributing the operation target power when the working time is not enough; and sending a charging and discharging instruction to the hybrid energy storage system according to the calculated operation target power of the energy storage subsystem. The data processing unit accurately calculates the energy storage subsystem for adjusting the power and the adjustment duration of the energy storage subsystem in real time, and the problems of low response speed and low adjustment precision are avoided.

Description

Technical Field

[0001] The present invention belongs to the field of power system frequency regulation control, and in particular relates to an AGC frequency regulation control system and method for a hybrid energy storage coupling unit. Background Art

[0002] With the continuous construction of new power systems and the large-scale grid connection of renewable energy, the dispatching and frequency regulation of power grids are facing unprecedented pressure. Traditional thermal power units, limited by their slow response speed and limited regulation accuracy, can no longer meet the urgent needs of modern power grids for fast and accurate frequency regulation. In order to effectively meet this challenge, energy storage technology has received widespread attention and application in the field of frequency regulation of power systems with its unique advantages.

[0003] However, when existing hybrid energy storage systems participate in grid frequency regulation, they often lack a unified control system and method, resulting in limited frequency regulation effects of the energy storage system. In the frequency regulation process, there are problems such as slow response speed and low frequency regulation accuracy, making it difficult to achieve coordinated work between energy storage systems. Therefore, the present invention proposes a hybrid energy storage coupling unit AGC frequency regulation control system and method, aiming to solve the problems existing in the prior art. Summary of the invention

[0004] The purpose of the present invention is to overcome the problems of slow response speed and low regulation accuracy of the existing power system frequency regulation technology, and to provide an AGC frequency regulation control system and method for a hybrid energy storage coupling unit.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: In a first aspect, the present invention provides an AGC frequency modulation control method for a hybrid energy storage coupling unit, comprising the following steps: Receive AGC adjustment instructions and grid load fluctuations issued by the grid dispatching center; According to the load fluctuation of the power grid and the AGC regulation instructions, calculate the total regulation power target value that needs to be adjusted; According to the total regulation power target value that needs to be adjusted, determine the energy storage subsystems involved in the regulation and the operating target power and charge state corresponding to the energy storage subsystems involved in the regulation; According to the state of charge of the energy storage subsystem involved in the regulation, its sustainable working time is calculated, and the operating target power is reallocated when the working time is insufficient; Based on the calculated target power of the energy storage subsystem, charging and discharging instructions are issued to the hybrid energy storage system.

[0006] Determining the energy storage subsystems involved in the regulation and their corresponding operating target powers also includes: determining the operating target power of each energy storage subsystem according to the maximum power change of each energy storage subsystem and the total regulation power target value.

[0007] Reallocating the operating target power when necessary also includes: if there is an energy storage subsystem whose sustainable working time is less than the adjustment duration, then after the time is reached, the operating target power borne by the energy storage subsystem will be distributed among other energy storage subsystems and generator sets with adjustment margin according to the preset adjustment priority order.

[0008] According to the real-time status information of the hybrid energy storage system and the total regulation power target value, the energy storage subsystems involved in the regulation and their corresponding operating target powers are determined.

[0009] The method also includes performing regular maintenance and fault detection on the hybrid energy storage system to ensure its long-term stable operation and efficient participation in the frequency regulation process of the power system.

[0010] In a second aspect, the present invention provides an AGC frequency modulation control system for a hybrid energy storage coupling unit, including an AGC control unit, a first data processing unit, a hybrid energy storage system, a second data processing unit, an energy management system EMS and a communication module; The AGC control unit is used to receive the AGC adjustment instruction issued by the power grid dispatching center; The first data processing unit is used to calculate the total regulated power target value that needs to be adjusted according to the load fluctuation of the power grid and the AGC regulation instruction; The hybrid energy storage system includes at least two energy storage subsystems with different energy storage forms, which are used to participate in power regulation through the energy storage subsystems to achieve energy conversion and storage; The second data processing unit is used to calculate the continuous working time of the energy storage subsystem, and reallocate the operating target power when the time is too short; The energy management system EMS is used to issue charging and discharging instructions to the hybrid energy storage system according to the active power that needs to be adjusted calculated by the data processing unit; The communication module is used to realize data communication and instruction transmission among the AGC control unit, the first data processing unit, the hybrid energy storage system, the second data processing unit and the energy management system EMS.

[0011] The energy storage subsystem of the hybrid energy storage system includes at least two of a lithium-ion battery energy storage system, a supercapacitor energy storage system, and a flywheel energy storage system.

[0012] The hybrid energy storage system includes a power conversion device, which is a high-voltage direct current transmission device for realizing efficient energy conversion and storage between different energy storage subsystems.

[0013] In a third aspect, the present invention provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and wherein the processor implements the steps of an AGC frequency modulation control method for a hybrid energy storage coupled unit when executing the computer program.

[0014] In a fourth aspect, the present invention provides a storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the steps of a method for AGC frequency modulation control of a hybrid energy storage coupled unit are implemented.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a hybrid energy storage coupling unit AGC frequency regulation control system and method, specifically, receiving the AGC regulation instruction issued by the power grid dispatching center and the load fluctuation of the power grid; calculating the total regulation power target value that needs to be adjusted according to the load fluctuation of the power grid and the AGC regulation instruction; determining the energy storage subsystem involved in the regulation and the corresponding operation target power and charge state of the energy storage subsystem involved in the regulation according to the total regulation power target value that needs to be adjusted; calculating its sustainable working time according to the charge state of the energy storage subsystem involved in the regulation, and reallocating the operation target power when the working time is insufficient; the energy management system EMS issues a charge and discharge instruction to the hybrid energy storage system according to the calculated operation target power of the energy storage subsystem. The data processing unit accurately calculates the energy storage subsystem that regulates the power and the regulation duration of the energy storage subsystem in real time, and can monitor the system in time, avoiding the problems of slow response speed and low regulation accuracy. Through the hybrid energy storage coupling unit AGC frequency regulation control system, the coordinated frequency regulation of the unit and the energy storage device can be realized, resource allocation can be optimized, and the overall operation efficiency of the power system can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a flow chart of the present invention; Figure 2 It is a system diagram of the present invention; Figure 3 This is a system diagram of Example 3 of the present invention. DETAILED DESCRIPTION

[0018] In order to further understand the content of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it.

[0019] Embodiment 1: like Figure 1 As shown, a hybrid energy storage coupling unit AGC frequency modulation control method includes the following steps: S1: Receive AGC adjustment instructions and load fluctuations of the power grid issued by the power grid dispatching center; S2: Calculate the total adjustment power target value that needs to be adjusted according to the load fluctuation of the power grid and the AGC adjustment instruction; S3: According to the total regulated power target value that needs to be adjusted, determine the energy storage subsystems involved in the regulation and the operating target power and charge state corresponding to the energy storage subsystems involved in the regulation; S4: Calculate the sustainable working time of the energy storage subsystem involved in the regulation according to its charge state, and reallocate the operating target power when necessary; S5: Based on the calculated target power of the energy storage subsystem, a charge and discharge instruction is issued to the hybrid energy storage system.

[0020] Furthermore, determining the energy storage subsystems involved in the regulation and their corresponding operating target powers in S3 also includes: determining the operating target power of each energy storage subsystem according to the maximum power change of each energy storage subsystem and the total regulation power target value.

[0021] Furthermore, in S4, reallocating the operating target power when necessary also includes: if there is a certain energy storage subsystem whose sustainable working time is less than the adjustment duration, then after the time is reached, the operating target power borne by the energy storage subsystem will be allocated among other energy storage subsystems and generator sets with adjustment margin according to the preset adjustment priority order.

[0022] Furthermore, the energy management system EMS in S5 determines the energy storage subsystems involved in the regulation and their corresponding operating target powers based on the real-time status information of the hybrid energy storage system (such as SOC, maximum charge and discharge power, etc.) and the total regulation power target value. When determining the energy storage subsystems involved in the regulation, the energy management system EMS will consider the characteristics and advantages of each energy storage subsystem to achieve the best regulation effect. If an abnormal situation or potential fault is found, the energy management system EMS will immediately issue an alarm signal and take corresponding protection measures to ensure the safe and reliable operation of the system.

[0023] By introducing a hybrid energy storage control system and taking advantage of the fast response speed of the hybrid energy storage system, the insufficient or excessive power of the unit during the frequency modulation process can be quickly compensated, thereby improving the frequency modulation response speed; the hybrid energy storage system can accurately calculate the power value that the energy storage device needs to provide based on the AGC frequency modulation instructions issued by the power grid dispatching system and the state information of the power grid, thereby achieving precise regulation. By coupling the hybrid energy storage with the unit AGC frequency modulation control system, the coordinated frequency modulation of the unit and the energy storage device can be achieved, resource allocation can be optimized, and the overall operating efficiency of the power system can be improved.

[0024] By implementing the AGC frequency regulation control method of the hybrid energy storage coupling unit proposed in the present invention, the frequency stability of the power grid can be significantly improved and the frequency fluctuation range of the power grid can be reduced. At the same time, the system can also realize real-time monitoring and fault diagnosis of the energy storage system to ensure the safe and reliable operation of the system. In addition, by optimizing the operation strategy of the energy storage system, the overall energy efficiency of the system can be improved and the operating cost can be reduced. This innovation not only helps to alleviate the pressure of power grid dispatching and frequency regulation, but also provides strong technical support for the large-scale grid connection of renewable energy.

[0025] Embodiment 2: like Figure 2 As shown, a hybrid energy storage coupling unit AGC frequency regulation control system includes: AGC control unit is used to receive AGC adjustment instructions issued by the power grid dispatching center. The first data processing unit is used to calculate the total regulating power target value that needs to be adjusted according to the load fluctuation of the power grid and the AGC regulation instruction; A hybrid energy storage system includes at least two energy storage subsystems with different energy storage forms, which are used to participate in power regulation through the energy storage subsystems to achieve energy conversion and storage; The second data processing unit is used to calculate the continuous working time of the energy storage subsystem, and reallocate the operating target power when the time is too short; The energy management system EMS is used to issue charging and discharging instructions to the hybrid energy storage system according to the active power that needs to be adjusted calculated by the data processing unit; Communication module: used to realize data communication and command transmission between the AGC control unit, the first data processing unit, the hybrid energy storage system, the second data processing unit and the energy management system EMS.

[0026] Preferably, the energy storage subsystem of the hybrid energy storage system includes at least two of a lithium-ion battery energy storage system, a supercapacitor energy storage system, and a flywheel energy storage system.

[0027] Preferably, the power conversion device is a high-voltage direct current transmission device, which is used to realize efficient conversion and storage of energy between different energy storage subsystems. An energy storage inverter can be used, which can store electric energy when the grid load is low and release electric energy when the load is peak, which is helpful for stabilizing the grid frequency and optimizing the distribution of electric energy. By adjusting the phase of the output current, the energy storage inverter can provide reactive power support, improve the power factor of the grid, and enhance the stability and quality of the grid. The energy storage inverter supports the operation of the smart grid and realizes the optimized operation and demand response of the grid through two-way interaction.

[0028] Preferably, during the AGC frequency modulation process of the hybrid energy storage coupled unit, in order to ensure the stable operation of the system and to promptly respond to possible faults, a special fault detection system can be set up for real-time monitoring and diagnosis. This fault detection system should have high sensitivity and accuracy, be able to detect and locate the fault point in a timely manner, and provide strong support for subsequent fault handling.

[0029] Embodiment 3: like Figure 3 As shown, the present invention also provides an electronic device 100 for an AGC frequency modulation control method for a hybrid energy storage coupled unit; the electronic device 100 includes a memory 101, at least one processor 102, a computer program 103 stored in the memory 101 and executable on the at least one processor 102, and at least one communication bus 104.

[0030] The memory 101 can be used to store the computer program 103, and the processor 102 implements the steps of the AGC frequency modulation control method of the hybrid energy storage coupling unit described in Example 1 by running or executing the computer program stored in the memory 101 and calling the data stored in the memory 101. The memory 101 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data (such as audio data) created according to the use of the electronic device 100, etc. In addition, the memory 101 can include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (FlashCard), at least one disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[0031] The at least one processor 102 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor 102 may be a microprocessor or any conventional processor, etc. The processor 102 is the control center of the electronic device 100, and uses various interfaces and lines to connect various parts of the entire electronic device 100.

[0032] The memory 101 in the electronic device 100 stores a plurality of instructions to implement an AGC frequency modulation control method for a hybrid energy storage coupling unit, and the processor 102 can execute the plurality of instructions to implement: Receive AGC adjustment instructions issued by the power grid dispatching center; According to the load fluctuation of the power grid and the AGC regulation instructions, calculate the total regulation power target value that needs to be adjusted; According to the total regulated power target value that needs to be adjusted, determine the energy storage subsystems involved in the regulation and their corresponding operating target powers; According to the state of charge of the energy storage subsystem involved in the regulation, its sustainable working time is calculated, and the operating target power is reallocated when the working time is insufficient; The energy management system EMS issues charging and discharging instructions to the hybrid energy storage system based on the calculated target power of the energy storage subsystem.

[0033] Embodiment 4: If the module / unit integrated in the electronic device 100 is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory and read-only memory (ROM, Read-Only Memory).

[0034] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0035] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0036] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0037] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0038] Finally, it should be noted that the above embodiments only describe the basic principles and main features of the present invention and the advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0039] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A hybrid energy storage coupling unit AGC frequency modulation control method, characterized in that: The steps include: Receive AGC adjustment instructions and grid load fluctuations issued by the grid dispatching center; According to the load fluctuation of the power grid and the AGC regulation instructions, calculate the total regulation power target value that needs to be adjusted; According to the total regulation power target value that needs to be adjusted, determine the energy storage subsystems involved in the regulation and the operating target power and charge state corresponding to the energy storage subsystems involved in the regulation; According to the state of charge of the energy storage subsystem involved in the regulation, its sustainable working time is calculated, and the operating target power is reallocated when the working time is insufficient; Based on the calculated target power of the energy storage subsystem, charging and discharging instructions are issued to the hybrid energy storage system.

2. A hybrid energy storage coupling unit AGC frequency modulation control method according to claim 1, characterized in that: Determining the energy storage subsystems involved in the regulation and their corresponding operating target powers also includes: determining the operating target power of each energy storage subsystem according to the maximum power change of each energy storage subsystem and the total regulation power target value.

3. A hybrid energy storage coupling unit AGC frequency modulation control method according to claim 1, characterized in that: Reallocating the operating target power when necessary also includes: if there is an energy storage subsystem whose sustainable working time is less than the adjustment duration, then after the time is reached, the operating target power borne by the energy storage subsystem will be distributed among other energy storage subsystems and generator sets with adjustment margin according to the preset adjustment priority order.

4. A hybrid energy storage coupling unit AGC frequency modulation control method according to claim 1, characterized in that: According to the real-time status information of the hybrid energy storage system and the total regulation power target value, the energy storage subsystems involved in the regulation and their corresponding operating target powers are determined.

5. The AGC frequency modulation control method of a hybrid energy storage coupling unit according to claim 1, characterized in that: The method also includes performing regular maintenance and fault detection on the hybrid energy storage system to ensure its long-term stable operation and efficient participation in the frequency regulation process of the power system.

6. A hybrid energy storage coupling unit AGC frequency modulation control system, characterized in that: It includes an AGC control unit, a first data processing unit, a hybrid energy storage system, a second data processing unit, an energy management system EMS and a communication module; The AGC control unit is used to receive the AGC adjustment instruction issued by the power grid dispatching center; The first data processing unit is used to calculate the total regulated power target value that needs to be adjusted according to the load fluctuation of the power grid and the AGC regulation instruction; The hybrid energy storage system includes at least two energy storage subsystems with different energy storage forms, which are used to participate in power regulation through the energy storage subsystems to achieve energy conversion and storage; The second data processing unit is used to calculate the continuous working time of the energy storage subsystem, and reallocate the operating target power when the time is too short; The energy management system EMS is used to issue charging and discharging instructions to the hybrid energy storage system according to the active power that needs to be adjusted calculated by the data processing unit; The communication module is used to realize data communication and instruction transmission among the AGC control unit, the first data processing unit, the hybrid energy storage system, the second data processing unit and the energy management system EMS.

7. A hybrid energy storage coupling unit AGC frequency modulation control system according to claim 6, characterized in that: The energy storage subsystem of the hybrid energy storage system includes at least two of a lithium-ion battery energy storage system, a supercapacitor energy storage system, and a flywheel energy storage system.

8. A hybrid energy storage coupled unit AGC frequency modulation control system according to claim 6, characterized in that: The hybrid energy storage system includes a power conversion device, which is a high-voltage direct current transmission device for realizing efficient energy conversion and storage between different energy storage subsystems.

9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the AGC frequency modulation control method of a hybrid energy storage coupling unit described in any one of claims 1 to 5 are implemented.

10. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the AGC frequency modulation control method of a hybrid energy storage coupling unit described in any one of claims 1 to 5 are implemented.

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