A frequency regulation and voltage regulation control system and method for a wind power storage station

Abstract

This invention belongs to the field of new energy power systems and automation technology, and particularly relates to a frequency and voltage regulation control system and method for wind power and energy storage power stations. The invention includes: a station-level EMS energy management system, a wind turbine energy management system, an electric hydrogen production power management system, and an inertia management system. Based on the station-level EMS energy management system, the entire station unit architecture is controlled, and inertia response control, primary frequency regulation control, and voltage regulation control of the wind power and energy storage power station are realized through a domain controller. The maximum power operation mode of the wind farm weakens the frequency stability and recovery capability of the power grid under high power deficit impacts. Response adjustments are differentiated according to priority, and a unified management and control system is established through a programmable domain controller. The structure includes a supercapacitor bank, an electric hydrogen production device, wind turbines and their inverters, transformers, and a domain controller, which are connected in series and then connected to a 35kV bus. This invention can enhance the active power recovery capability under frequency disturbances and the reactive power regulation capability.

Description

Technical Field

[0001] This invention belongs to the field of new energy power system and automation technology, and in particular relates to a frequency and voltage regulation control system and method for wind power and energy storage power stations. Specifically, it relates to a station-level inertial response and frequency and voltage regulation control system and method for wind power and energy storage power stations. Background Technology

[0002] With the large-scale integration of wind power into the power grid, the original rotational inertia and frequency and voltage regulation capabilities of the system have been significantly reduced. The maximum power operation mode of wind farms weakens the frequency stability and recovery capability of the power grid under the impact of high power shortage. The deficiencies in inertial response and primary frequency and voltage regulation capabilities have become the main reasons for the restriction on the large-scale grid connection of wind power. The inertial response at the wind farm level and the primary frequency regulation capability under frequency disturbances urgently need to be improved. Therefore, those skilled in the art have been continuously updating and improving the technology. Summary of the Invention

[0003] To address the shortcomings of the existing technologies, this invention provides a frequency and voltage regulation control system and method for wind power storage power stations. The purpose is to integrate a novel energy storage system with wind turbine generators using a domain controller, establishing a site-level EMS (Energy Management System) for wind power storage power stations, thereby enhancing the active power recovery capability, reactive power regulation capability, and rotational inertia, frequency disturbance recovery capability, and reactive power regulation capability.

[0004] The technical solution adopted by the present invention to achieve the above objectives is as follows:

[0005] A frequency and voltage regulation control system for a wind power storage station includes: a station-level EMS energy management system, a wind turbine energy management system, an electric hydrogen production power management system, and an inertia management system; the electric hydrogen production device, the supercapacitor bank, and the output terminal of the wind turbine inverter are electrically connected to a switch, the switch is electrically connected to one end of a busbar, and the other end of the busbar is electrically connected to the input terminal of a transformer; a plug-in busbar is used between the inverter and the transformer.

[0006] Furthermore, the electro-hydrogen production power management system includes an electro-hydrogen production device, an inverter, a transformer, and an electrolytic hydrogen production power domain controller. The output terminal of the electrolytic hydrogen production unit is connected to the input terminal of an AC / DC converter. The output terminal of the AC / DC converter is connected to the No. 2 transformer and fed into the 35kV bus as a second output terminal. The other output terminal of the AC / DC converter is connected to the input terminal of the electrolytic hydrogen production power domain controller. The output terminal of the electrolytic hydrogen production power domain controller is connected to the site-level EMS of the wind-storage power station.

[0007] Furthermore, the inertia management system includes: a supercapacitor unit, an inverter, a transformer, and an inertia response domain controller. The output terminal of the supercapacitor is connected to the input terminal of the AC / DC converter. The output terminal of the AC / DC converter is connected to the No. 3 transformer and fed into the 35kV bus as the third output terminal. The other output terminal of the AC / DC converter is connected to the input terminal of the inertia response domain controller. The output terminal of the inertia response domain controller is connected to the site-level EMS of the wind-storage power station.

[0008] Furthermore, the topology of the site-level EMS energy management system includes an AC signal acquisition module, a frequency modulation and voltage regulation module, a data recording module, a remote control module, a communication module, and a human-machine interaction module. The AC signal acquisition module communicates with the domain controller via the Modbus-TCP protocol after being transmitted through the IEC 104 protocol to the frequency modulation and voltage regulation module. The human-machine interaction module enables visual scheduling and control. The data recording module records the waveforms after the domain controller responds to the action. The remote control module enables remote and local control.

[0009] A frequency and voltage regulation control method for a wind-storage power station includes four stages: a wind-storage power station voltage regulation control method, an inertia response method, a primary frequency regulation control method, and a voltage regulation calculation method.

[0010] The inertia response method includes the following steps:

[0011] The initial period is the time of frequency fluctuation.

[0012] S1: Acquisition frequency; The AC signal data acquisition module acquires the frequency value at the grid connection point of the wind-storage power station in real time;

[0013] S2: Determine the inertia dead zone; the frequency and voltage regulation module determines the... Is it within the inertia dead zone?

[0014] S3: The supercapacitor bank enters inertia response mode; if so, the communication module does not operate, and the AGC control system continues to execute the command target value; the inertia response module controls the supercapacitor bank to enter inertia response mode (standby mode);

[0015] S4: The supercapacitor bank does not enter the inertia response mode; otherwise, the communication module does not operate, and the AGC control system continues to execute the command target value.

[0016] S5: Frequency and voltage regulation module judgment <0;

[0017] S6: If The communication module then locks the AGC control system, and the inertia response module presets and sends out the inertia response change ΔP.

[0018] S7: If The communication module remains inactive, and the AGC control system continues to execute the target value command.

[0019] S8: Frequency and voltage regulation module determines Δf > 0; < 0;

[0020] S9: If Δf>0, the supercapacitor bank absorbs the active power regulation ΔP;

[0021] S11: Determine the inertial response dead zone; Frequency and voltage regulation module determination. Is it within the inertia dead zone?

[0022] S12: If so, the communication module sends a command to unlock the AGC control system, and the supercapacitor bank exits the inertia response mode.

[0023] S13: If not, the supercapacitor bank continues to perform active power regulation ΔP;

[0024] S14: The inertia response module controls the supercapacitor bank to exit the inertia response control mode. The inertia response module and communication module must add a lockout command point table with the AGC control system. The lockout time should lag behind the inertia module response time.

[0025] The frequency stabilizes at the end.

[0026] Furthermore, the primary frequency modulation control method includes the following steps:

[0027] The starting point is the frequency fluctuation period, including:

[0028] S1: Acquisition frequency; The AC signal data acquisition module acquires the frequency value at the grid connection point of the wind-storage power station in real time;

[0029] S2: Determine the primary frequency modulation dead zone; the frequency modulation and voltage regulation module determines whether the frequency change Δf is within the primary frequency modulation dead zone range;

[0030] S3: If the frequency change Δf is within the primary frequency modulation dead zone, the primary frequency modulation module does not operate, and the AGC control system continues to execute the command target value.

[0031] If the AGC receives a scheduling instruction again during the first frequency regulation period, the communication module adopts the principle of taking the maximum value in the same direction and locking the AGC control system in the opposite direction; until the frequency change Δf is within the dead zone of the first frequency regulation, if the AGC control system was locked before, the communication module sends an unlock signal to the AGC control system, and the electric hydrogen production device exits the first frequency regulation control mode.

[0032] S4: If not, if the frequency change Δf exceeds the primary frequency modulation dead zone, the primary frequency modulation module controls the electro-hydrogen production device to enter the primary frequency modulation control mode (standby mode); the frequency modulation and voltage regulation module determines whether Δf>0 or<0; the primary frequency modulation module presets and issues the primary frequency modulation change ΔP; then the AGC control system continues to execute the instruction target value;

[0033] S5: Determine the frequency change Δf; the frequency modulation and voltage regulation module determines whether the frequency change Δf < 0 or > 0; the primary frequency modulation module presets and sends the primary frequency modulation change ΔP;

[0034] S6: If Δf < 0, the electro-hydrogen production device releases active power regulation ΔP;

[0035] S7: If Δf>0, the electro-hydrogen production device absorbs the active power regulation ΔP;

[0036] S8: Determine the primary frequency modulation dead zone; the frequency modulation and voltage regulation module determines the primary frequency modulation dead zone;

[0037] S9: Exit primary frequency modulation mode; the primary frequency modulation module controls the electro-hydrogen production unit to exit the primary frequency modulation mode. If the AGC control system was previously locked, the communication module sends a lock-out signal to the AGC control system, and then the primary frequency modulation module controls the supercapacitor group to exit the inertia response control mode.

[0038] S10: The electric hydrogen production unit continues to implement active power regulation ΔP;

[0039] The frequency stabilizes at the end.

[0040] Furthermore, the voltage regulation control method includes: calculating the voltage change ΔU exceeding the dead zone based on the collected voltage value, and issuing a reactive power regulation amount Q through the domain controller. 补偿 For the voltage regulating device, the order of adjustment is energy storage regulation - SVG regulation - fan outlet side regulation. If the energy storage system meets the system reactive power compensation difference at this time, the SVG static reactive power compensation device is used to adjust the system transient reactive power fluctuation.

[0041] The voltage regulation calculation method includes the following steps:

[0042] Before and after the voltage regulating device is put into operation, the values ​​of system voltage and bus voltage have the following relationship:

[0043] Before investing:

[0044]

[0045] After investment:

[0046]

[0047] The compensation capacity on the high-voltage side of the busbar is:

[0048]

[0049] In the above formula, Us is the system voltage; U is the load-side voltage; U1 is the bus voltage before the voltage regulator is put into operation; U2 is the bus voltage after the voltage regulator is put into operation; P is the three active power of the load; R is the line resistance; X is the line reactance; Q is the three reactive power of the load, and the voltage regulator is disengaged when the compensation reactive power value is within the dead zone range.

[0050] A frequency and voltage regulation control device for a wind-storage power station includes:

[0051] The AC signal acquisition module is used to acquire real-time current and voltage data and calculate frequency, active power and reactive power.

[0052] The frequency and voltage regulation module is used to calculate the frequency and voltage changes.

[0053] The inertia response module is used to determine the opening and closing of domain controller branches;

[0054] A primary frequency modulation module is used to determine the opening and closing of domain controller branch circuits;

[0055] The data recording module is used to record the changes in active power, reactive power, and voltage and current waveforms after the domain controller is triggered.

[0056] A computer device includes a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor. When the processor executes the computer program, it implements the steps of any of the wind power station frequency and voltage regulation control methods, systems, and devices described above.

[0057] A computer storage medium storing a computer program, wherein when the computer program is executed by a processor, the program implements the steps of any of the aforementioned wind power station frequency and voltage regulation control methods, systems, and devices.

[0058] The present invention has the following beneficial effects and advantages:

[0059] Hydrogen energy, as a chemical raw material and clean energy source, can meet the frequency and voltage regulation needs of wind power and energy storage power plants, while also addressing the issue of wind and electricity curtailment. Supercapacitors, as a novel and high-quality energy storage device, have attracted widespread attention due to their second-level charge-discharge capability, tens of thousands of cycle lifespan, wide temperature adaptability, and environmentally friendly characteristics. Their advantages are mainly reflected in their fast charging speed, high energy conversion efficiency, simple and accurate calculation of state of charge (SOC), and high power density.

[0060] Therefore, this invention employs differentiated control based on inertial response and frequency / voltage regulation. It utilizes the rapid charging and discharging capability of supercapacitor banks to respond to inertia; and leverages the bidirectional regulation capability of the electro-hydrogen production device to rapidly provide active power support for primary frequency regulation when the frequency is disturbed during the maximum power operation of the wind turbine; and injects reactive current into the system through the electro-hydrogen production device to achieve voltage control. This solves the problems of primary frequency regulation and reactive power regulation capabilities of wind farms when experiencing station-level inertial response and frequency disturbances during maximum power operation. Attached Figure Description

[0061] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0062] Figure 1 This is a structural diagram of a wind-storage power station according to a specific embodiment of the present invention;

[0063] Figure 2 This is a structural diagram of the site-level EMS energy management system and controllers at each level of the present invention;

[0064] Figure 3 This is a flowchart illustrating the specific implementation of the inertia response of the present invention;

[0065] Figure 4 This is a flowchart illustrating the specific implementation of the primary frequency modulation method of the present invention;

[0066] Figure 5 This is the equivalent circuit diagram of the voltage regulation of this invention;

[0067] Figure 6 This is an illustration of the frequency modulation adjustment amount of the present invention. Detailed Implementation

[0068] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0069] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0070] The following reference Figures 1-6 The technical solutions of some embodiments of the present invention are described below.

[0071] Example 1

[0072] This invention provides an embodiment of a frequency and voltage regulation control system for a wind-storage power station, specifically a site-level inertial response and frequency and voltage regulation control system for a wind-storage power station. For example... Figure 1 As shown, Figure 1 This is a structural diagram of the wind-storage power station provided by the present invention.

[0073] This invention discloses a frequency and voltage regulation control system for a wind power station, comprising: a site-level EMS energy management system, a wind turbine energy management system, an electric hydrogen production power management system, and an inertia management system. Based on the existing site-level EMS energy management system control unit architecture, a domain controller is used to achieve unified management and control of frequency and voltage regulation for the wind power station. Specifically, the electric hydrogen production device, supercapacitor bank, and wind turbine inverter output terminals are electrically connected to a switch. The switch is electrically connected to one end of a busbar, and the other end of the busbar is electrically connected to the transformer input terminal. A plug-in busbar is used between the inverter and the transformer.

[0074] The wind turbine energy management system includes: a wind turbine unit, an inverter, a transformer, and a wind turbine energy management domain controller. The electro-hydrogen production power management system includes: an electro-hydrogen production unit, an inverter, a transformer, and an electrolytic hydrogen production power domain controller. The inertia management system includes: a supercapacitor inertia response unit, an inverter, a transformer, and an inertia response domain controller.

[0075] like Figure 2 As shown, Figure 2 This is a topology diagram of the site-level EMS energy management system of the present invention. The topology of the site-level EMS energy management system of the wind power station should include an AC signal acquisition module; a frequency modulation and voltage regulation module; a data recording module; a remote control module; a communication module; and a human-machine interface module. The AC signal acquisition module transmits the signal to the frequency modulation and voltage regulation module via the IEC 104 protocol, and then to the Modbus-TCP protocol via the communication module to communicate with the domain controller. The human-machine interface module realizes visualized scheduling and control, the data recording module records the waveforms after the domain controller responds, and the remote control module realizes remote and local control.

[0076] The wind power station's site-level EMS energy management system controls the wind turbine energy management system, hydrogen production power management system, and inertia management system. Specifically, the wind turbine energy management system controls the wind turbine energy management domain controller; the hydrogen production power management system controls the electrolysis hydrogen power domain controller; and the inertia management system controls the inertia response domain controller.

[0077] The modules, energy storage devices, and domain controllers of this invention are all uniformly controlled by the site-level EMS energy management system.

[0078] The wind turbine energy management system controls the wind turbine energy management domain controller, which is connected to the wind turbine unit. The first output terminal of the wind turbine is connected to the input terminal of the converter. The output terminal of the wind turbine AC / AC converter is connected to the No. 1 transformer and fed into the 35kV bus as the first output terminal, which is connected to the wind turbine energy management domain controller, i.e., the input terminal of the energy management platform. The output terminal of the wind turbine energy management domain controller is connected to the site-level EMS of the wind-storage power station.

[0079] The electrolytic hydrogen production power management system controls the electrolytic hydrogen production power domain controller, which is connected to the electrolytic hydrogen production unit. The output of the electrolytic hydrogen production unit is connected to the input of an AC / DC converter. The output of the AC / DC converter is connected to transformer No. 2 and fed into the 35kV bus as a second output. The other output of the AC / DC converter is connected to the input of the electrolytic hydrogen production power domain controller, and the output of the electrolytic hydrogen production power domain controller is connected to the site-level EMS of the wind-storage power station.

[0080] The inertia management system controls the inertia response domain controller, which is connected to the supercapacitor inertia response unit. The output terminal of the supercapacitor is connected to the input terminal of the AC / DC converter. The output terminal of the AC / DC converter is connected to the No. 3 transformer and fed into the 35kV bus as the third output terminal. The other output terminal of the AC / DC converter is connected to the input terminal of the inertia response domain controller. The output terminal of the inertia response domain controller is connected to the site-level EMS of the wind-storage power station.

[0081] Example 2

[0082] The present invention provides another embodiment of a wind-storage power station frequency and voltage regulation control method, comprising four stages: a wind-storage power station voltage regulation control method, an inertia response control method, a primary frequency regulation control method, and a voltage regulation calculation method.

[0083] The method described above is a voltage regulation control method for a wind-storage power station. Based on the collected voltage values, the voltage regulation module calculates the voltage change ΔU exceeding the dead zone and issues a reactive power regulation quantity Q through the domain controller. 补偿 The voltage regulating device includes an electric hydrogen generator, an SVG (Static Var Generator), and a wind turbine. Based on the voltage regulation response speed, the reactive power adjustment sequence should be: electric hydrogen generator - SVG adjustment - wind turbine outlet side adjustment. If the reactive power generated by the electric hydrogen generator meets the system's reactive power compensation difference, the SVG can be used to adjust the system's transient reactive power fluctuations. The SVG represents a static reactive power compensation device. The voltage regulating equipment sequentially exits the voltage control mode until ΔU enters the voltage dead zone.

[0084] Example 3

[0085] This invention provides another embodiment, which is a frequency and voltage regulation control method for a wind-storage power station, and more specifically, a site-level inertial response method for a wind-storage power station. The inertial response control method flow is as follows: Figure 3 As shown, it includes the following steps:

[0086] The beginning is the moment of frequency fluctuation.

[0087] S1: Acquisition frequency; The AC signal data acquisition module acquires the frequency value at the grid connection point of the wind-storage power station in real time;

[0088] S3: The supercapacitor bank enters inertia response mode; if so, the communication module does not operate, and AGC continues to execute the command target value; the inertia response module controls the supercapacitor bank to enter inertia response mode (standby mode);

[0089] S4: The supercapacitor bank does not enter the inertia response mode; otherwise, the communication module does not operate, and the AGC control system continues to execute the command target value.

[0090] S5: Frequency and voltage regulation module judgment <0;

[0091] S6: If Then the communication module locks AGC, and the inertia response module sends out the inertia response change ΔP in advance;

[0092] S7: If The communication module remains inactive, and the AGC control system continues to execute the target value command.

[0093] S8: Frequency and voltage regulation module determines Δf > 0; < 0;

[0094] S9: If Δf>0, the supercapacitor bank absorbs the active power regulation ΔP;

[0095] S11: Determine the inertial response dead zone; Frequency and voltage regulation module determination. Is it within the inertia dead zone?

[0096] S12: If so, the communication module issues an AGC unlocking command, and the supercapacitor bank exits;

[0097] S13: If not, the supercapacitor bank continues to perform active power regulation ΔP;

[0098] S14: The inertia response module controls the supercapacitor bank to exit the inertia response control mode. The inertia response module and communication module must be updated with an AGC interlock command point table, and the interlock time should lag behind the inertia module response time.

[0099] The frequency stabilizes at the end.

[0100] Example 4

[0101] This invention provides another embodiment of a frequency and voltage regulation control method for a wind-storage power station, wherein the primary frequency regulation control method flow is as follows: Figure 4 As shown, the primary frequency modulation control method specifically includes the following steps:

[0102] The beginning is the moment of frequency fluctuation.

[0103] S1: Acquisition frequency; The AC signal data acquisition module acquires the frequency value at the grid connection point of the wind-storage power station in real time;

[0104] S2: Determine the primary frequency modulation dead zone; the frequency modulation and voltage regulation module determines whether the frequency change Δf is within the primary frequency modulation dead zone range;

[0105] S3: If the frequency change Δf is within the primary frequency modulation dead zone, the primary frequency modulation module does not operate, and the AGC control system continues to execute the command target value.

[0106] If the AGC receives a scheduling instruction again during the first frequency regulation period, the communication module adopts the principle of taking the maximum value in the same direction and locking the AGC control system in the opposite direction; until the frequency change Δf is within the dead zone of the first frequency regulation, if the AGC control system was locked before, the communication module sends an unlock signal to the AGC, and the electric hydrogen production device exits the first frequency regulation control mode.

[0107] S4: If not, if the frequency change Δf exceeds the primary frequency modulation dead zone, the primary frequency modulation module controls the electro-hydrogen production device to enter the primary frequency modulation control mode (standby mode); the frequency modulation and voltage regulation module determines whether Δf > 0 or < 0; the primary frequency modulation module presets and issues the primary frequency modulation change ΔP; then AGC continues to execute the instruction target value;

[0108] S5: Determine the frequency change Δf; the frequency modulation and voltage regulation module determines whether the frequency change Δf < 0 or > 0; the primary frequency modulation module presets and sends the primary frequency modulation change ΔP;

[0109] S6: If Δf < 0, the electro-hydrogen production device releases active power regulation ΔP;

[0110] S7: If Δf>0, the electro-hydrogen production device absorbs the active power regulation ΔP;

[0111] S8: Determine the primary frequency modulation dead zone; the frequency modulation and voltage regulation module determines the primary frequency modulation dead zone;

[0112] S9: Exit primary frequency modulation mode; the primary frequency modulation module controls the electro-hydrogen production unit to exit the primary frequency modulation mode. If the AGC was previously locked, the communication module sends an unlock signal to the AGC, and then the primary frequency modulation module controls the supercapacitor group to exit the inertia response control mode.

[0113] S10: The electro-hydrogen production unit continues to perform active power regulation ΔP.

[0114] The frequency stabilizes at the end.

[0115] The primary frequency modulation module and communication module must be equipped with an AGC interlock command point table, and the interlock time should precede the response time of the primary frequency modulation module.

[0116] The preset primary frequency regulation change ΔP should satisfy the characteristics of the primary frequency regulation active power-frequency droop curve and the principle of maximizing the communication module in the same direction and blocking AGC in the opposite direction. AGC refers to Automatic Generation Control System.

[0117] Example 5

[0118] This invention provides another embodiment, which is a frequency and voltage regulation control method for a wind-storage power station, wherein the voltage regulation calculation method is as follows: Figure 5 As shown, Figure 5 This is the equivalent circuit diagram for voltage regulation.

[0119] Before and after the voltage regulating device is put into operation, the values ​​of system voltage and bus voltage have the following relationship:

[0120] Before investing:

[0121]

[0122] After investment:

[0123]

[0124] The compensation capacity on the high-voltage side of the busbar is:

[0125]

[0126] In the above formula, Us is the system voltage; U is the load-side voltage; U1 is the bus voltage before the voltage regulator is engaged; U2 is the bus voltage after the voltage regulator is engaged; P is the three active power of the load; R is the line resistance; X is the line reactance; and Q is the three reactive power of the load. The voltage regulator is disengaged when the compensated reactive power value is within the dead zone range.

[0127] Due to the randomness, intermittency, and irregularity of wind resources, the high penetration rate of wind turbines has a significant impact on the power grid, and the grid structure forces wind farms to curtail wind and electricity. Hydrogen, as a clean energy source, has the characteristics of high energy density, large capacity, long lifespan, and ease of storage and transportation, thus becoming one of the preferred options for the large-scale integrated development, utilization, and storage of wind power.

[0128] Example 6

[0129] This invention provides another embodiment of a module required for frequency and voltage regulation control in a wind-storage power station, comprising:

[0130] The AC signal acquisition module is used to acquire real-time current and voltage data and calculate frequency, active power and reactive power.

[0131] The frequency and voltage regulation module is used to calculate the frequency and voltage changes.

[0132] The inertia response module is used to determine the opening and closing of domain controller branches;

[0133] A primary frequency modulation module is used to determine the opening and closing of domain controller branch circuits;

[0134] The data recording module is used to record the changes in active power, reactive power, voltage, and current waveforms after the domain controller is triggered.

[0135] Example 7

[0136] Based on the same inventive concept, embodiments of the present invention also provide a computer device, including a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor. When the processor executes the computer program, it implements the steps of any of the wind-storage power station frequency and voltage regulation control methods described in embodiments 1-6.

[0137] Example 8

[0138] Based on the same inventive concept, this embodiment of the invention also provides a computer storage medium storing a computer program, which, when executed by a processor, implements the steps of any of the wind power station frequency and voltage regulation control methods described in embodiments 1-5.

[0139] It should be noted that the specific implementation method for wind power storage power stations is similar to the specific implementation method of the hybrid energy storage frequency regulation control method for wind farms in any of the above embodiments of the present invention. For details, please refer to the description of the method section above. In order to reduce redundancy, it will not be repeated here.

[0140] The invention has been described through embodiments. However, as will be known to those skilled in the art, and as defined in the appended patent claims, other embodiments disclosed above are equally within the scope of the invention.

[0141] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless otherwise expressly defined herein. All references to “a / the / the [apparatus, module, method, etc.]” ​​are openly interpreted as at least one instance of said apparatus, module, method, etc., unless otherwise expressly stated. The steps of any method disclosed herein need not be performed in the exact order disclosed, unless explicitly stated otherwise. Various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and model of the invention, the scope of which is defined by the claims and their equivalents.

[0142] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied 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.

[0143] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0144] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0145] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0146] 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 it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do 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 frequency and voltage regulation control method for a wind-storage power station, characterized in that: It includes four stages: voltage regulation control method for wind-storage power plants, inertia response method, primary frequency regulation control method, and voltage regulation calculation method. The inertia response method includes the following steps: The initial period is the time of frequency fluctuation. S1: Acquisition frequency; The AC signal data acquisition module acquires the frequency value at the grid connection point of the wind-storage power station in real time; S2: Determine the inertia dead zone; frequency and voltage regulation module judgment. Is it within the inertia dead zone? S3: The supercapacitor bank enters inertia response mode; if so, the communication module does not operate, and the AGC control system continues to execute the command target value; the inertia response module controls the supercapacitor bank to enter inertia response mode (standby mode). S4: The supercapacitor bank does not enter the inertia response mode; otherwise, the communication module does not operate, and the AGC control system continues to execute the command target value. S5: Frequency and voltage regulation module judgment ; S6: If Then the communication module locks the AGC control system, and the inertia response module presets and sends out the inertia response change ΔP. S7: If If the communication module does not respond, the AGC control system will continue to execute the target value of the instruction. S8: Frequency and voltage regulation module judgment ; S9: If The supercapacitor bank absorbs active power regulation ΔP; S11: Determine the inertial response dead zone; Frequency and voltage regulation module determination. Is it within the inertia dead zone? S12: If so, the communication module sends a command to unlock the AGC control system, and the supercapacitor bank exits the inertia response mode. S13: If not, the supercapacitor bank continues to perform active power regulation ∆P; S14: The inertia response module controls the supercapacitor bank to exit the inertia response control mode. The inertia response module and communication module must add a lockout command point table with the AGC control system. The lockout time should lag behind the inertia module response time. The frequency stabilizes at the end.

2. The frequency and voltage regulation control method for a wind-storage power station according to claim 1, characterized in that: The primary frequency modulation control method includes the following steps: The starting point is the frequency fluctuation period, including: S1: Acquisition frequency; The AC signal data acquisition module acquires the frequency value at the grid connection point of the wind-storage power station in real time; S2: Determine the frequency modulation dead zone; the frequency modulation and voltage regulation module determines the frequency change. Is it within the FM dead zone range? S3: If: If the frequency change amount Within the primary frequency modulation dead zone, the primary frequency modulation module does not operate, and the AGC control system continues to execute the command target value; If the AGC receives another scheduling command during a frequency adjustment period, the communication module adopts the principle of maximizing the value in the same direction and locking the AGC control system in the opposite direction; until the frequency change... When the device is within the primary frequency regulation dead zone, if the AGC control system was previously locked, the communication module sends a lock-out signal to the AGC control system, and the electric hydrogen production unit exits the primary frequency regulation control mode. S4: If not, if the frequency change amount When the frequency exceeds the primary frequency regulation dead zone, the primary frequency regulation module controls the electro-hydrogen production unit to enter the primary frequency regulation control mode (standby mode); the frequency regulation and voltage regulation module determines... The primary frequency modulation module presets and issues the primary frequency modulation change ΔP; then the AGC control system continues to execute the command target value. S5: Determine the frequency change The frequency modulation and voltage regulation module determines the frequency change. The primary frequency modulation module pre-sets and sends out the primary frequency modulation change amount ΔP. S6: If The active power regulation amount ∆P released by the electro-hydrogen production unit; S7: If The active power regulation amount ∆P absorbed by the electro-hydrogen production unit; S8: Determine the primary frequency modulation dead zone; the frequency modulation and voltage regulation module determines the primary frequency modulation dead zone; S9: Exit primary frequency modulation mode; the primary frequency modulation module controls the electro-hydrogen production unit to exit the primary frequency modulation mode. If the AGC control system was previously locked, the communication module sends a lock-out signal to the AGC control system, and then the primary frequency modulation module controls the supercapacitor group to exit the inertia response control mode. S10: The electric hydrogen production unit continues to implement active power regulation ∆P; The frequency stabilizes at the end.

3. The frequency and voltage regulation control method for a wind-storage power station according to claim 1, characterized in that, The voltage regulation control method includes: calculating the voltage change exceeding the dead zone based on the collected voltage value using the voltage regulation module. Reactive power regulation is issued through the domain controller. For the voltage regulating device, the order of adjustment is energy storage regulation - SVG regulation - fan outlet side regulation. If the energy storage system meets the system reactive power compensation difference at this time, the SVG static reactive power compensation device is used to adjust the system transient reactive power fluctuation. The voltage regulation calculation method includes the following steps: Before and after the voltage regulating device is put into operation, the values ​​of system voltage and bus voltage have the following relationship: Before investing: ; After investment: ; The compensation capacity on the high-voltage side of the busbar is: ; In the above formula, Us is the system voltage; U is the load-side voltage; U1 is the bus voltage before the voltage regulator is put into operation; U2 is the bus voltage after the voltage regulator is put into operation; P is the three active power of the load; R is the line resistance; X is the line reactance; Q is the three reactive power of the load, and the voltage regulator is disengaged when the compensation reactive power value is within the dead zone range.

4. The wind-storage power station frequency and voltage regulation control method according to claim 1 is implemented using a wind-storage power station frequency and voltage regulation control system, characterized in that... The wind power station frequency and voltage regulation control system includes: a station-level EMS energy management system, a wind turbine energy management system, an electric hydrogen production power management system, and an inertia management system; the electric hydrogen production device, supercapacitor bank, and wind turbine inverter output terminals are electrically connected to a switch, the switch is electrically connected to one end of a busbar, and the other end of the busbar is electrically connected to the transformer input terminal; a plug-in busbar is used between the inverter and the transformer; the electric hydrogen production power management system includes an electric hydrogen production device, an inverter, a transformer, an electrolytic hydrogen production power domain controller, the output terminal of the electrolytic cell hydrogen production unit is connected to the input terminal of an AC / DC converter, the output terminal of the AC / DC converter is connected to transformer No. 2 and fed into the 35kV busbar as a second output terminal, and the other output terminal of the AC / DC converter is connected to the electrolytic hydrogen production power supply. The input terminal of the source domain controller and the output terminal of the electrolysis hydrogen production power domain controller are connected to the site-level EMS of the wind power storage station. The inertia management system includes: supercapacitor units, inverters, transformers, and inertia response domain controllers. The output terminal of the supercapacitor is connected to the input terminal of the AC / DC converter. The output terminal of the AC / DC converter is connected to the No. 3 transformer and fed into the 35kV bus as the third output terminal. The other output terminal of the AC / DC converter is connected to the input terminal of the inertia response domain controller. The output terminal of the inertia response domain controller is connected to the site-level EMS of the wind power storage station. The topology of the site-level EMS energy management system includes an AC signal acquisition module, a frequency modulation and voltage regulation module, a data recording module, a remote control module, a communication module, and a human-machine interaction module. The AC signal acquisition module communicates with the domain controller via the Modbus-TCP protocol after passing through the IEC 104 protocol to the frequency modulation and voltage regulation module. The human-machine interaction module realizes visual scheduling and control. The data recording module records the waveform after the domain controller responds. The remote control module realizes remote and local control. The wind power station's site-level EMS energy management system controls the wind turbine energy management system, hydrogen production power management system, and inertia management system; among them, the wind turbine energy management system controls the wind turbine energy management domain controller; the hydrogen production power management system controls the electrolysis hydrogen power domain controller; and the inertia management system controls the inertia response domain controller. The wind turbine energy management system controls the wind turbine energy management domain controller, which is connected to the wind turbine unit. The first output terminal of the wind turbine is connected to the input terminal of the converter. The output terminal of the wind turbine AC / AC converter is connected to the No. 1 transformer and fed into the 35kV bus as the first output terminal, which is connected to the wind turbine energy management domain controller, i.e., the input terminal of the energy management platform. The output terminal of the wind turbine energy management domain controller is connected to the site-level EMS of the wind-storage power station. The electro-hydrogen power management system controls the electro-hydrogen power domain controller, which is connected to the electro-hydrogen generator unit. The inertia management system controls the inertia response domain controller, which is connected to the supercapacitor inertia response unit.

5. A computer device, comprising a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the frequency and voltage regulation control method, system, and device for a wind power station as described in any one of claims 1-4.

6. A computer storage medium, characterized in that, The computer storage medium contains a computer program, which, when executed by a processor, implements the steps of a wind power station frequency and voltage regulation control method, system, and device as described in any one of claims 1-4.

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