Energy storage type static var generator control method and system

Abstract

The invention discloses an energy storage type static var generator control method and system, and the method comprises the steps: constructing a virtual energy storage type static var generator (SVG), and simulating the working condition of a power grid; the method comprises the following steps of: receiving a power grid signal from a virtual energy storage static var generator (SVG) by adopting an entity controller, and calculating reference values of active power and reactive power; according to the calculated power reference value, the output of the SVG is adjusted in real time, and closed-loop control is completed. According to the method, the dependence on actual hardware equipment is remarkably reduced, and meanwhile, a safe, economical and efficient experimental environment is provided. The system can accurately simulate operation characteristics under a complex power grid condition in a simulation environment, rapidly responds to frequency and voltage fluctuation, is short in recovery time and high in adjustment precision, and especially has excellent performance in dynamic working conditions and abnormal disturbance scenes.

Description

Technical Field

[0001] The invention belongs to the field of power electronics and simulation technology, and in particular relates to a control method and system for an energy storage type static VAR generator. Background Art

[0002] The proportion of renewable energy in the power system is gradually increasing. The widespread access to clean energy such as wind and solar energy has led to a relative decrease in the proportion of traditional synchronous generators. This change not only marks a transformation in the energy structure, but also brings new challenges to the stable operation of the power grid. Due to the intermittent and uncertain nature of renewable energy and the reduction in the proportion of traditional synchronous generators, the overall inertia of the power grid has decreased. Inertia is an important physical characteristic for the power grid to maintain stable operation. Its weakening leads to a decrease in the power grid's ability to regulate frequency fluctuations, that is, the response ability of frequency regulation is no longer as fast and effective as before.

[0003] To meet this challenge, the fast-response energy storage static VAR generator (SVG) plays a vital role in the power system. As an advanced power electronic device, the energy storage SVG can provide the necessary frequency and voltage support for the power grid by quickly adjusting its output active power and reactive power. When the grid frequency fluctuates or the voltage shifts, the energy storage SVG can respond quickly and adjust its output to smooth out these fluctuations, thereby helping to improve the dynamic response capability and stability of the power grid.

[0004] On the other hand, in the traditional hardware system verification process, it is often necessary to build complex experimental equipment and invest a lot of manpower, material and financial resources. These high costs not only increase the burden of project development, but may also prolong the R&D cycle and reduce market competitiveness. Summary of the invention

[0005] The object of the present invention is to provide a control method and system for an energy storage type static VAR generator to solve the above-mentioned problems.

[0006] To achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a method for controlling an energy storage type static VAR generator, comprising: Construct a virtual energy storage static VAR generator SVG and simulate grid conditions; A physical controller is used to receive grid signals from a virtual energy storage static VAR generator SVG and calculate reference values ​​of active power and reactive power; According to the calculated power reference value, the output of the virtual energy storage static VAR generator SVG is adjusted in real time to complete the closed-loop control.

[0007] Optionally, the step of constructing a virtual energy storage static VAR generator SVG and simulating grid conditions includes: A virtual controlled object module including an energy storage unit and a reactive power compensation unit is constructed, and the operating conditions are switched by adjusting input parameters; the energy storage unit is used to provide the active power regulation required by the power grid; and the reactive power compensation unit is used to regulate reactive power.

[0008] Optionally, the adopting of a physical controller to receive a grid signal from a virtual energy storage type static VAR generator SVG comprises: The physical controller is connected to the virtual controlled object module through an interface, receives voltage and frequency signals, and executes control strategies for active power and reactive power regulation.

[0009] Optionally, the reference value for calculating active power is: The active power regulation uses a PI control strategy, as follows:

[0010] Where, e(t) represents the frequency deviation, K p is the proportional gain, K i is the integral gain.

[0011] Optionally, the reference value for calculating reactive power is: Reactive power regulation uses a droop control strategy, and the regulation formula is as follows:

[0012] in, Indicates voltage deviation, is the droop coefficient.

[0013] Optionally, adjusting the output of the virtual energy storage static VAR generator SVG in real time according to the calculated power reference value to complete the closed-loop control includes: The virtual controlled object module forms a closed-loop control with the physical controller, exchanging data and signals in real time. The physical controller calculates the power reference value based on the real-time feedback and outputs the adjustment signal to the virtual energy storage SVG in the platform. When a frequency event occurs in the power grid, the physical controller determines the deviation of frequency and voltage based on the power grid status and implements a strategy to increase the regulation intensity; during steady-state control, the controller continuously monitors the power grid parameters and makes small adjustments.

[0014] In a second aspect, the present invention provides a control system for an energy storage type static VAR generator, comprising: Virtual building module, used to build a virtual energy storage static VAR generator SVG and simulate grid conditions; A reference value calculation module, used for receiving a grid signal from a virtual energy storage type static VAR generator SVG by using a physical controller, and calculating reference values ​​of active power and reactive power; The output regulation module is used to adjust the output of the virtual energy storage static VAR generator SVG in real time according to the calculated power reference value to complete the closed-loop control.

[0015] Optionally, the step of constructing a virtual energy storage static VAR generator SVG and simulating grid conditions includes: Construct a virtual controlled object module including an energy storage unit and a reactive power compensation unit, and switch the working conditions by adjusting the input parameters; the energy storage unit is used to provide the active power required by the power grid; the reactive power compensation unit is used to provide reactive power; The method of using a physical controller to receive a power grid signal from a virtual energy storage type static VAR generator SVG includes: The physical controller is connected to the virtual controlled object module through an interface, receives voltage, frequency and current signals, and executes control strategies for active power and reactive power regulation.

[0016] In a third aspect, the present invention provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method for controlling a storage-type static VAR generator when executing the computer program.

[0017] In a fourth aspect, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the energy storage type static VAR generator control method are implemented.

[0018] Compared with the prior art, the present invention has the following technical effects: The present invention can reduce hardware dependence in a complex power grid environment by virtualizing the energy storage SVG. It can simulate and test a variety of working conditions without actually building an expensive hardware test platform, thereby significantly improving the efficiency of system debugging and verification. Virtualization technology makes working condition switching fast and easy to implement, reducing the complex operations and risks in actual hardware testing.

[0019] The physical controller is the core control unit of the system, responsible for running the real-time control strategy and exchanging data with the virtual controlled object. This structure enables the control strategy to be fully tested and verified in a virtual environment to ensure its adaptability and stability in the actual power grid. Through real-time feedback and closed-loop control, the system can dynamically adjust the power output to cope with various changes in the power grid.

[0020] The virtual controlled object module can simulate the dynamic working conditions of the power grid, such as voltage fluctuations, frequency changes, and load disturbances. This provides a rich test scenario for power system simulation, helping researchers to gain a deeper understanding of power grid behavior and optimize control strategies. At the same time, the virtualization platform supports the simulation of various power grid conditions, improving the safety and flexibility of development and testing.

[0021] Virtualization technology reduces the use of physical equipment, thereby reducing system deployment costs and the risk of equipment damage. This is an important economic advantage for the research and development and testing of power systems. In addition, the virtualization platform also facilitates fault simulation and emergency drills, improving the emergency response capabilities of the power grid.

[0022] This technical solution achieves precise control of grid voltage and frequency through real-time deviation calculation and adjustment, closed-loop control and feedback, frequency regulation and steady-state control. When a frequency event occurs in the grid, the physical controller can quickly analyze the grid status and implement a strategy to increase the intensity of regulation to quickly restore the grid to a steady state. This significantly improves the stability and responsiveness of the grid, helping to ensure the safe and stable operation of the power system.

[0023] In summary, this technical solution provides an efficient and flexible simulation and real-time control method for the energy storage static VAR generator (SVG) system by combining virtualization technology and physical controller. This not only improves the efficiency of system debugging and verification, but also enhances the adaptability and stability of the control strategy, reduces costs and risks, and improves the stability and responsiveness of the power grid. Therefore, this technical solution has broad application prospects and important practical value in the field of power systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a flow chart of the present invention.

[0025] Figure 2 This is a principle block diagram of the present invention. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings: Example 1, please refer to Figure 1 The present invention provides a control method for an energy storage type static VAR generator, comprising: Construct a virtual energy storage static VAR generator SVG and simulate grid conditions; A physical controller is used to receive grid signals from a virtual energy storage static VAR generator SVG and calculate reference values ​​of active power and reactive power; According to the calculated power reference value, the output of the virtual energy storage static VAR generator SVG is adjusted in real time to complete the closed-loop control.

[0027] The physical controller of the present invention can quickly calculate and output adjustment signals to cope with complex and dynamic changes in the power grid.

[0028] The virtual hardware environment supports the simulation of various power grid conditions, reduces dependence on actual equipment, and improves the safety and flexibility of development and testing.

[0029] Through virtualization technology, the use of physical devices is reduced, and the system deployment cost and the risk of equipment damage are reduced.

[0030] Embodiment 2, the present invention provides a method for controlling an energy storage type static VAR generator, specifically comprising: The present invention provides an energy storage type static VAR generator (SVG) system based on a virtual controlled object and a physical controller and a control method thereof, aiming to realize efficient and flexible power system simulation and real-time control.

[0031] By virtualizing the energy storage SVG, the present invention can reduce hardware dependence in a complex power grid environment, significantly improve the efficiency of system debugging and verification, and ensure the adaptability and stability of the control strategy.

[0032] The system structure of the present invention is as follows: Virtual controlled object module: The advantage of virtualization is that the working conditions can be quickly switched by adjusting the input parameters, reducing the complex operations and risks in actual hardware testing.

[0033] Energy storage unit: The energy storage unit is implemented on the virtual controlled object to simulate the behavior of the real energy storage device. Its function is to provide the active power regulation required by the power grid, quickly respond to the frequency changes of the power grid and participate in the primary frequency regulation process.

[0034] Reactive power compensation module: The reactive power compensation module is implemented on the virtual controlled object and is used to provide reactive power.

[0035] Entity Controller: As the core control unit of the system, the physical controller is responsible for running real-time control strategies and exchanging data with the platform.

[0036] The physical controller receives real-time voltage, frequency and power data from the virtual controlled object, calculates the power reference value based on these feedback data, and generates corresponding regulation signals.

[0037] This signal is used to adjust the active power and reactive power output of the energy storage SVG to meet the frequency and voltage stability requirements of the power grid.

[0038] The control method of the present invention consists of the following steps to achieve real-time closed-loop control and dynamic power regulation: A. Power grid dynamic simulation: The virtual controlled object simulates the dynamic conditions of the power grid, such as voltage fluctuations, frequency changes and load disturbances. The generated real-time signals are transmitted to the physical controller. These signals include data such as voltage, frequency and power, which constitute the input of the control system.

[0039] B. Real-time deviation calculation and adjustment: The physical controller calculates the power deviation and outputs the adjustment signal by the following method: Active power control: The PI physical controller is used to calculate the frequency deviation, and its control output is determined by the following formula:

[0040] Where, e(t) represents the frequency deviation, K p is the proportional gain, K i is the integral gain.

[0041] Reactive power control: The droop control strategy is used to adjust the reactive power. The expression is:

[0042] Where ΔV represents the voltage deviation, K d is the droop coefficient.

[0043] C. Closed-loop control and feedback: The virtual controlled object and the physical controller form a closed-loop control system to exchange data and signals in real time. The physical controller calculates the power reference value based on real-time feedback and outputs a regulation signal to the virtual energy storage SVG in the platform to stabilize the voltage and frequency of the power grid.

[0044] D. Frequency regulation and steady-state control: When a frequency event occurs in the power grid, the physical controller quickly analyzes the power grid status, determines the deviation of frequency and voltage, and implements a strategy to increase the regulation intensity to quickly restore the power grid to a steady state. During the steady-state control process, the controller continuously monitors the power grid parameters and makes small adjustments to maintain system balance.

[0045] Embodiment 3, the energy storage static VAR generator (SVG) system of the present invention realizes efficient real-time closed-loop control based on a virtual controlled object and a physical controller. The following specifically describes the method for implementing the system: A. Construction of virtual controlled object: In the process of implementing the present invention, a virtual controlled object is first built on the platform. The platform is used to simulate the components of the energy storage SVG system, including the energy storage unit, the reactive power compensation module and the power grid environment. The specific implementation steps are as follows: Configuration of virtual energy storage unit: The electrical characteristics of the energy storage unit are simulated on the virtual controlled object so that it can respond to changes in grid frequency and adjust active power output.

[0046] Implementation of reactive power compensation module: Build a reactive power compensation module for reactive power regulation to ensure that it can simulate the response characteristics of actual equipment and effectively regulate the grid voltage.

[0047] Simulation of grid conditions: Virtual controlled objects can simulate different grid dynamics, such as steady-state operation, short-term load disturbances, frequency fluctuations, and voltage sags, providing a variety of test conditions for system testing and control strategy verification.

[0048] B. Control Strategy Implementation After the virtual hardware is built, the control strategy is implemented on the physical controller. The implementation steps include: Real-time data acquisition and input: The physical controller exchanges data with the virtual controlled object through the interface and receives voltage, frequency and power signals in real time.

[0049] Control strategy application: Implement control strategies in physical controllers, including PI regulation of active power and droop control of reactive power, to ensure the stability of grid frequency and voltage.

[0050] Real-time regulation and signal output: The physical controller calculates the power command based on the real-time data received and generates the corresponding control signal to adjust the output of the energy storage SVG on the virtual controlled object to ensure that the frequency and voltage of the power grid are maintained within the set range.

[0051] C. Closed-loop control and optimization During system operation, the physical controller and the virtual controlled object form a closed-loop control to ensure real-time response to grid conditions and adjust output. The specific implementation includes: Real-time data feedback and adjustment: The virtual controlled object receives the regulation signal from the physical controller and adjusts the output of the virtual energy storage SVG to achieve rapid response to the power grid. The physical controller monitors the operating status of the system in real time and continuously adjusts the output based on the feedback. System debugging and parameter optimization: Observe and analyze the simulation data and control signals of the power grid through the monitoring function of the virtual controlled object. Adjust the control parameters such as PI entity controller gain and droop coefficient according to the operating conditions to improve the system response speed and regulation accuracy.

[0052] The present invention aims to realize real-time simulation and efficient control of energy storage static VAR generator (SVG) system under complex power grid conditions. By introducing virtual controlled objects, the system can simulate a variety of dynamic power grid conditions, including typical scenarios such as voltage fluctuations, frequency changes, and load disturbances, providing a flexible and efficient testing environment for the development and verification of control strategies. At the same time, the physical controller and the virtual controlled object form a closed-loop interaction, perform real-time data processing and control strategy output, and ensure that the system has good dynamic response capabilities during the simulation process.

[0053] In terms of control methods, the present invention uses advanced control technologies and regulation strategies. First, the PI control strategy is used to achieve precise regulation of active power, ensuring that the grid frequency can be quickly stabilized within a predetermined range; second, the droop control method is used to dynamically adjust reactive power to maintain the stability and dynamic balance of the grid voltage.

[0054] Compared with traditional physical experimental methods, the present invention significantly reduces the dependence on actual hardware equipment, while providing a safe, economical and efficient experimental environment. Experiments show that the system can accurately simulate the operating characteristics under complex power grid conditions in a simulation environment, quickly respond to frequency and voltage fluctuations, have a short recovery time, and high regulation accuracy, especially in dynamic conditions and abnormal disturbance scenarios.

[0055] The present invention is widely applicable to various power system control scenarios, including new energy access, microgrid operation optimization, power grid frequency regulation and other application fields. By combining the virtual controlled object with the physical controller, a technically advanced, flexible and cost-controlled solution is provided for the frequency and voltage stability of the power grid, which has high promotion value and practical significance.

[0056] In yet another embodiment of the present invention, a control system of an energy storage type static VAR generator is provided, which can be used to implement the above-mentioned energy storage type static VAR generator control method. Specifically, the system includes: Virtual building module, used to build a virtual energy storage static VAR generator SVG and simulate grid conditions; A reference value calculation module, used for receiving a grid signal from a virtual energy storage type static VAR generator SVG by using a physical controller, and calculating reference values ​​of active power and reactive power; The output regulation module is used to adjust the output of the virtual energy storage static VAR generator SVG in real time according to the calculated power reference value to complete the closed-loop control.

[0057] The division of modules in the embodiments of the present invention is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in each embodiment of the present invention may be integrated into one processor, or may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules.

[0058] In another embodiment of the present invention, a computer device is provided, the computer device comprising a processor and a memory, the memory being used to store a computer program, the computer program comprising program instructions, and the processor being used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc., which are the computing core and control core of the terminal, which are suitable for implementing one or more instructions, and are specifically suitable for loading and executing one or more instructions in a computer storage medium to implement a corresponding method flow or corresponding function; the processor described in the embodiment of the present invention can be used for the operation of a storage-type static reactive generator control method.

[0059] In another embodiment of the present invention, the present invention further provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It is understandable that the computer-readable storage medium here can include both built-in storage media in the computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the corresponding steps of the control method of a storage-type static reactive generator in the above embodiment.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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 in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A control method for a storage type static VAR generator, characterized in that: include: Construct a virtual energy storage static VAR generator SVG and simulate grid conditions; A physical controller is used to receive grid signals from a virtual energy storage static VAR generator SVG and calculate reference values ​​of active power and reactive power; According to the calculated power reference value, the output of the virtual energy storage static VAR generator SVG is adjusted in real time to complete the closed-loop control.

2. A method for controlling an energy storage type static VAR generator according to claim 1, characterized in that: The construction of a virtual energy storage static VAR generator SVG and simulation of power grid conditions includes: A virtual controlled object module including an energy storage unit and a reactive power compensation unit is constructed, and the operating conditions are switched by adjusting input parameters; the energy storage unit is used to provide the active power regulation required by the power grid; and the reactive power compensation unit is used to regulate reactive power.

3. A method for controlling an energy storage type static VAR generator according to claim 2, characterized in that: The method of using a physical controller to receive a power grid signal from a virtual energy storage type static VAR generator SVG includes: The physical controller is connected to the virtual controlled object module through an interface, receives voltage and frequency signals, and executes control strategies for active power and reactive power regulation.

4. A method for controlling an energy storage type static VAR generator according to claim 3, characterized in that: The reference value for calculating active power is: The active power regulation uses a PI control strategy, as follows: Where, e(t) represents the frequency deviation, K p is the proportional gain, K i is the integral gain.

5. The energy storage type static VAR generator control method according to claim 3, characterized in that: The reference value for calculating reactive power is: Reactive power regulation uses a droop control strategy, and the regulation formula is as follows: in, Indicates voltage deviation, is the droop coefficient.

6. The energy storage type static VAR generator control method according to claim 1, characterized in that: The method of adjusting the output of the virtual energy storage static VAR generator SVG in real time according to the power reference value obtained by calculation to complete the closed-loop control includes: The virtual controlled object module forms a closed-loop control with the physical controller, exchanging data and signals in real time. The physical controller calculates the power reference value based on the real-time feedback and outputs the adjustment signal to the virtual energy storage SVG in the platform. When a frequency event occurs in the power grid, the physical controller determines the deviation of frequency and voltage based on the power grid status, and makes adjustments of varying magnitudes based on the deviations; during steady-state control, the controller continuously monitors power grid parameters and makes small adjustments.

7. A control system for a storage type static VAR generator, characterized in that: include: Virtual building module, used to build a virtual energy storage static VAR generator SVG and simulate grid conditions; A reference value calculation module, used for receiving a grid signal from a virtual energy storage type static VAR generator SVG by using a physical controller, and calculating reference values ​​of active power and reactive power; The output regulation module is used to adjust the output of the virtual energy storage static VAR generator SVG in real time according to the calculated power reference value to complete the closed-loop control.

8. The energy storage type static VAR generator control system according to claim 7, characterized in that: The construction of a virtual energy storage static VAR generator SVG and simulation of power grid conditions includes: Construct a virtual controlled object module including an energy storage unit and a reactive power compensation unit, and switch the working conditions by adjusting the input parameters; the energy storage unit is used to provide the active power regulation required by the power grid; the reactive power compensation unit is used to regulate reactive power; The method of using a physical controller to receive a power grid signal from a virtual energy storage type static VAR generator SVG includes: The physical controller is connected to the virtual controlled object module through an interface, receives voltage and frequency signals, and executes control strategies for active power and reactive power regulation.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the energy storage type static VAR generator control method as described in any one of claims 1 to 6 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of a method for controlling an energy storage type static VAR generator as claimed in any one of claims 1 to 6 are implemented.

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