Working method of new energy power system

Abstract

The invention relates to a working method of a new energy power system, which comprises the following steps of: when an active / reactive power generation mode is started, after voltage is received, controlling a converter to drag the frequency of a motor through a controller, so that the frequency of the motor is the same as that of a power grid, and generating excitation pulse by utilizing a power supply cabinet to establish generator terminal voltage to realize synchronous grid connection; receiving a scheduling instruction to perform active / reactive power generation; when the phase modifier mode is started, after the voltage generated by multiple energy sources is received, the converter is controlled by the controller to drag the frequency of the motor, so that the frequency of the motor is the same as that of a power grid, excitation pulses are generated by the power cabinet to establish generator terminal voltage, the converter is disconnected after grid connection, and a dispatching instruction is received for reactive power generation. The system can aim at a new energy power generation system, comprises photovoltaic and wind power generation, has the advantages of non-harmonic voltage power generation, inertia support, adjustable inertia, flexible grid-connected voltage and the like, and improves the safe and stable operation level of an extra-high voltage AC / DC power grid.

Description

Technical Field

[0001] The present application belongs to the technical field of electric power market, and specifically relates to a working method of a new energy electric power system. Background Art

[0002] A high proportion of new energy power grid is an inevitable development trend in the energy and power sector in the future. After a high proportion of new energy is connected to the power grid, a large number of new energy converters will replace synchronous generators, reducing system inertia, causing the power grid to present a high degree of power electronics characteristics, resulting in fundamental changes in the power supply characteristics of the power grid, and bringing huge challenges to the stable operation of the power system.

[0003] In the related technologies, the grid-connected new energy lacks reliable inertial response and has low frequency tolerance, which results in a decrease in the frequency anti-disturbance capability of the power grid. In addition, the transient voltage and current support capabilities of the new energy converters are insufficient, which results in a decrease in the fault ride-through capability of the new energy. Summary of the invention

[0004] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide a working method for a new energy power system to solve the problem in the prior art that new energy grid connection lacks reliable inertial response and has low frequency tolerance, resulting in a decrease in the frequency anti-disturbance ability of the power grid.

[0005] To achieve the above objectives, this application adopts the following technical solutions: a working method of a new energy power system,

[0006] The new energy power system comprises a multi-source complementary input device, a converter, a motor set and a generator, wherein the multi-source complementary input device, the converter, the motor set and the generator are connected in sequence; wherein a plurality of inertia adjustment units are arranged on the end of the shaft of the motor set away from the generator; the plurality of inertia adjustment units are used to change the mass of the rotating shaft and thus adjust the rotational inertia of the generator according to the linear positive correlation between the rotational inertia of the generator and the mass of the rotating shaft and the radius of the rotating shaft; the converter is controlled by a controller, and the controller controls the operation of the new energy power system, and the working method comprises:

[0007] The controller receives the start command and starts the active / reactive power generation mode or the phase-shifting mode;

[0008] When the active / reactive power generation mode is started, after receiving the voltage generated by multiple energy sources, the controller controls the converter to drive the motor frequency so that the motor frequency is the same as the grid frequency, and the power cabinet is used to send excitation pulses to establish the generator terminal voltage, realize synchronous grid connection, and receive dispatching instructions to perform active / reactive power generation;

[0009] When the phase-shifting mode is started, after receiving the voltage generated by multiple energy sources, the controller controls the inverter to drag the motor frequency so that the motor frequency is the same as the grid frequency. The power cabinet sends an excitation pulse to establish the generator terminal voltage, achieve synchronous grid connection, disconnect the inverter, and receive dispatch instructions to perform reactive power generation.

[0010] Furthermore, before starting the active / reactive power generation mode or the phase-shifting mode, the method further includes:

[0011] Determining the available energy of a multi-source complementary input device;

[0012] Determine power data and grid status; the power data includes grid voltage, frequency and phase;

[0013] Set the thresholds for each grid condition.

[0014] Furthermore, when the available energy of the multi-source complementary input device is greater than the no-load operation power consumption of the system, and the wind speed at the wind turbine unit site is greater than the cut-in wind speed, the active / reactive power generation mode is started;

[0015] When the available energy of the multi-source complementary input device is greater than the system no-load operation power consumption, and the wind speed at the wind turbine unit position is less than the cut-in wind speed, the phase-shifting mode is started;

[0016] When the available energy of the multi-source complementary input device is less than the system no-load operation power consumption, and the wind speed at the wind turbine unit position is greater than the cut-in wind speed, the controller starts the wind turbine unit, and the power generation output of the started wind turbine unit is stored in the energy storage module of the multi-source complementary input device through the DC bus until the available energy of the multi-source complementary input device is greater than the system no-load operation power consumption to start the active / reactive power generation mode;

[0017] When the available energy of the multi-source complementary input device is less than the system no-load power consumption, the main controller starts the grid power rectifier in the DC bus cabinet, and the grid power is stored in the energy storage module through the DC bus until the available energy of the multi-source complementary input device is greater than the system no-load power consumption, and the phase-shifting mode is started.

[0018] Furthermore, in active / reactive power generation mode,

[0019] According to the grid voltage, frequency, phase and grid status, the speed of the generator set is adjusted through the converter, and the excitation voltage of the generator is adjusted through the power supply cabinet to achieve synchronous grid connection and system grid-connected operation;

[0020] The grid parameters are judged according to the threshold detection of each grid condition and the operating condition is selected.

[0021] Furthermore, the grid parameters are determined based on the threshold detection of each grid condition, and the operating condition is selected, including:

[0022] Determine the grid inertia support in the current primary frequency regulation and steady-state voltage support demand operating conditions based on the grid condition threshold;

[0023] The fault support of the current operating condition providing fault support capability is determined according to the power grid condition threshold.

[0024] Furthermore, during the operation of the system, the controller monitors the wind speed in real time, which serves as a basis for calculating the maximum output capacity data of wind power generation for the next control instruction of the controller.

[0025] Furthermore, in the camera adjustment mode,

[0026] According to the grid voltage, frequency, phase and grid status, the speed of the generator set is adjusted through the converter, and the excitation voltage of the generator is adjusted through the power supply cabinet to achieve synchronous grid connection and grid-connected operation of the system. After successful grid connection, the main controller gives instructions and the converter enters the standby state;

[0027] The grid parameters are judged according to the threshold detection of each grid condition and the operating condition is selected.

[0028] Furthermore, the grid parameters are determined based on the threshold detection of each grid condition, and the operating condition is selected, including:

[0029] Determine the no-load hot standby currently in normal operating conditions according to the power grid operating condition threshold;

[0030] Determine the grid inertia support in the current primary frequency regulation and steady-state voltage support demand operating conditions based on the grid condition threshold;

[0031] The fault support of the current operating condition providing fault support capability is determined according to the power grid condition threshold.

[0032] The present application adopts the above technical solution, and the beneficial effects that can be achieved include:

[0033] The present application provides a working method for a new energy power system, which can start two modes, active / reactive power generation mode or phase-shifting mode. When the active / reactive power generation mode is started, after receiving the voltage generated by multiple energy sources, the inverter is controlled by a controller to drag the motor frequency, so that the motor frequency is the same as the grid frequency, and the power supply cabinet is used to send excitation pulses to establish the generator terminal voltage, achieve synchronous grid connection, and receive dispatch instructions to perform active / reactive power generation; when the phase-shifting mode is started, after receiving the voltage generated by multiple energy sources, the inverter is controlled by a controller to drag the motor frequency, so that the motor frequency is the same as the grid frequency, and the power supply cabinet is used to send excitation pulses to establish the generator terminal voltage, achieve synchronous grid connection, disconnect the inverter, and receive dispatch instructions to perform reactive power generation; the present application supports multiple energy sources, so that new energy power generation also has the advantages of traditional hydro-thermal power generation, improves the inertia support and voltage support capabilities of new energy sites, is more beneficial to the safe operation of the power grid, and improves the safe and stable operation level of ultra-high voltage AC and DC power grids. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A schematic diagram of the structure of the new energy power system for this application;

[0036] Figure 2 A schematic diagram of the steps of the working method of the new energy power system for this application;

[0037] Figure 3 A flowchart of the working method of the new energy power system for this application;

[0038] Figure 4 This is a flow chart of the working method of the new energy power system of this application. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other implementation methods obtained by ordinary technicians in the field without creative work belong to the scope of protection of the present application.

[0040] The following describes a specific working method of a new energy power system provided in an embodiment of the present application in conjunction with the accompanying drawings.

[0041] The working method of the new energy power system provided in the embodiments of the present application is as follows: Figure 1 As shown, the new energy power system includes a multi-source complementary input device, a converter, a motor set and a generator, and the multi-source complementary input device, the converter, the motor set and the generator are connected in sequence; wherein, a plurality of inertia adjustment units are arranged on the end of the shaft of the motor set away from the generator; the plurality of inertia adjustment units are used to change the mass of the rotating shaft and thus adjust the rotational inertia of the generator according to the linear positive correlation between the rotational inertia of the generator and the mass of the rotating shaft and the radius of the rotating shaft; the converter is controlled by a controller, and the controller controls the operation of the new energy power system, such as Figure 2 As shown, the working method includes:

[0042] S101, the controller receives a start instruction and starts an active / reactive power generation mode or a phase-shifting mode;

[0043] S102, when the active / reactive power generation mode is started, after receiving the voltage generated by multiple energy sources, the controller controls the converter to drive the motor frequency so that the motor frequency is the same as the grid frequency, uses the power supply cabinet to send excitation pulses to establish the generator terminal voltage, realizes synchronous grid connection, and receives the dispatching instruction to perform active / reactive power generation;

[0044] S103, when the phase-shifting mode is started, after receiving the voltage generated by multiple energy sources, the controller controls the inverter to drag the motor frequency so that the motor frequency is the same as the grid frequency, and the power cabinet sends an excitation pulse to establish the generator terminal voltage to achieve synchronous grid connection, disconnect the inverter, and receive the dispatching instruction to perform reactive power generation.

[0045] The multi-source complementary device in this application belongs to the energy input link, supports the access of multiple energy sources, and provides green energy input for this system; the converter 2 belongs to the conversion link, covering multiple types, such as DC / AC, AC / DC / AC, etc., usually adopts DC to AC inverter to provide the required pulse for driving the motor; the motor is driven by the converter 2 to rotate, providing the motive force for the generator 4; the generator 4 is driven by the motor to rotate, emits AC power and connects to the grid. This application can stabilize the overall power generation of the system, reduce the randomness of new energy power generation, and improve the power generation efficiency of the motor through the input of multiple energy complementation. The introduction of the motor and the generator 4 makes the new energy power generation also have the advantages of traditional water and thermal power generation, improves the inertia support and voltage support capabilities of the new energy station, and is more beneficial to the safe operation of the power grid.

[0046] The new energy power generation system provided by the present application, the multi-source complementary input device 1 in the present application can generate wind power and solar power, and can also store the remaining energy when there is excess wind energy and solar energy. If the energy storage is full, consider green electricity hydrogen production, etc. When the wind and light are insufficient, the energy storage system emits electrical energy, so that the transmission capacity of the entire system is more stable. Then the multi-source complementary input device 1 inputs the current after energy conversion into the converter 2. It can be understood that the multi-source complementary input device 1 can output both direct current and alternating current. The AC converter can convert the received current into alternating current, thereby using alternating current to drive the motor group 3, the motor group 3 is coaxially connected to the generator 4 to generate electricity, and the generator 4 emits alternating current for grid connection.

[0047] It is understandable that the present application is compatible with a generator 4 of multiple voltage levels, and the generator 4 supports power grids of different voltage levels such as 690V, 1140V, 3kV, 10kV, 35kV, etc. It supports high-voltage direct-hanging grid connection, saves the cost of step-up transformers, and improves the reliability of the system.

[0048] The new energy power generation system provided in the present application converges on the input side of the converter 2 and supports multiple energy sources, so that new energy power generation also has the advantages of traditional hydro-thermal power generation, improves the inertia support and voltage support capabilities of the new energy station, and is more beneficial to the safe operation of the power grid.

[0049] In some optional embodiments, a plurality of inertia adjustment units are provided on the end of the shaft of the motor group 3 away from the generator 4;

[0050] The plurality of inertia adjustment units are used to change the mass of the rotating shaft and thus adjust the rotational inertia of the generator 4 according to the linear positive correlation between the rotational inertia of the generator 4 and the mass of the rotating shaft and the radius of the rotating shaft.

[0051] The rotational inertia of the generator 4 is adjusted by adjusting the number or size of the inertia adjustment units.

[0052] It should be noted that the motor and generator 4 in this application adopt a coaxial design, the shaft mass of the coaxial motor can be changed, the motor has multiple windings, and the generator 4 supports high-voltage direct connection to the grid. Compared with traditional motors, this application considers reducing losses and adopts a design in which the generator 4 and the motor share a mechanical shaft. The new energy drives the motor through the converter 2, and uses the coaxial power to drive the generator 4 to rotate and then generate electricity and connect to the grid. The motor in this application is equivalent to the prime mover of the generator 4.

[0053] In this application, the inertia adjustment unit adopts the generator 4 inertia formula, J = mr 2, where J is the moment of inertia, m is the mass of the shaft, and r is the radius of the shaft. According to the inertia formula of the generator 4, the motor moment of inertia is linearly positively correlated with the mass of the shaft and the radius of the shaft. Since the generator 4 and the motor of the present application adopt a coaxial design, it is possible to set a number of inertia adjustment units on the motor or the coaxial end of the motor to change the mass of the shaft and thus adjust the moment of inertia of the generator 4, such as Figure 4 The inertia can be adjusted by adjusting the number or size of the inertia adjustment units.

[0054] The working modes of the new energy power generation system provided in this application include two modes: active / reactive power generation mode and phase modulation mode.

[0055] like Figure 3 As shown in the figure, when the system is operating in active / reactive power generation, it can generate power by receiving dispatching instructions, and can generate capacitive reactive power or inductive reactive power at the same time, achieving the dual functions of green power generation and grid voltage support. The specific process is as follows:

[0056] Close the input switch 5 of converter 2 to make the DC voltage of multi-source input ready; close the output switch 6 of converter 2 to open the path; start the inverter module in converter 2, that is, the inverter drives the motor frequency to be basically synchronized with the grid frequency, so that the motor sends excitation pulses, establishes the terminal voltage of generator 4, and dynamically adjusts the voltage of generator 4 so that it meets the grid connection conditions with the grid voltage amplitude and phase, closes the grid connection switch, and generator 4 is connected to the grid, and receives the dispatching instructions to send active and reactive power.

[0057] like Figure 4 As shown, when the system operates in the phase-shifting mode, the generator 4 does not generate active power, but only generates reactive power. It can generate capacitive reactive power or inductive reactive power according to the dispatching instruction to achieve the purpose of supporting the grid voltage. The specific process is as follows:

[0058] Close the input switch 5 of converter 2 to make the DC voltage of multi-source input ready; close the output switch 6 of converter 2 to open the path; start the inverter module in converter 2, that is, the inverter drives the motor frequency to be basically synchronized with the grid frequency, so that the motor sends excitation pulses, establishes the terminal voltage of generator 4, and dynamically adjusts the voltage of generator 4 so that it meets the grid connection conditions with the grid voltage amplitude and phase, closes the grid connection switch, generator 4 is connected to the grid, disconnects the output switch 6 of converter 2, and accepts the dispatching instruction to adjust the reactive power.

[0059] The working method of the new energy power system can be targeted at new energy power generation systems, including photovoltaic and wind power generation, and has the advantages of harmonic-free voltage generation, inertial support, adjustable inertia, and flexible grid-connected voltage, thereby improving the safe and stable operation level of UHV AC and DC power grids.

[0060] In some optional embodiments, before starting the active / reactive power generation mode or the phase-shifting mode, the method further includes:

[0061] Determining the available energy of a multi-source complementary input device;

[0062] Determine power data and grid status; the power data includes grid voltage, frequency and phase;

[0063] Set the thresholds for each grid condition.

[0064] Specifically, in the present application, when the available energy of the multi-source complementary input device is greater than the no-load operation power consumption of the system, and the wind speed at the wind turbine unit site is greater than the cut-in wind speed, the active / reactive power generation mode is started;

[0065] When the available energy of the multi-source complementary input device is greater than the system no-load operation power consumption, and the wind speed at the wind turbine unit position is less than the cut-in wind speed, the phase-shifting mode is started;

[0066] When the available energy of the multi-source complementary input device is less than the system no-load operation power consumption, and the wind speed at the wind turbine unit position is greater than the cut-in wind speed, the controller starts the wind turbine unit, and the power generation output of the started wind turbine unit is stored in the energy storage module of the multi-source complementary input device through the DC bus until the available energy of the multi-source complementary input device is greater than the system no-load operation power consumption to start the active / reactive power generation mode;

[0067] When the available energy of the multi-source complementary input device is less than the system no-load power consumption, the main controller starts the grid power rectifier in the DC bus cabinet, and the grid power is stored in the energy storage module through the DC bus until the available energy of the multi-source complementary input device is greater than the system no-load power consumption, and the phase-shifting mode is started.

[0068] In this application, according to the grid voltage, frequency, phase and grid status, the speed of the generator set is adjusted through the converter, and the excitation voltage of the generator is adjusted through the power cabinet to achieve synchronous grid connection and system grid-connected operation;

[0069] The grid parameters are judged according to the threshold detection of each grid condition and the operating condition is selected.

[0070] Among them, judging the grid parameters according to the threshold detection of each grid condition and selecting the operating condition include:

[0071] Determine the grid inertia support in the current primary frequency regulation and steady-state voltage support demand operating conditions based on the grid condition threshold;

[0072] The fault support of the current operating condition providing fault support capability is determined according to the power grid condition threshold.

[0073] It should be noted that during the operation of the system, the controller monitors the wind speed in real time, which serves as the basis for calculating the maximum output capacity data of wind power generation for the next control instruction of the controller.

[0074] In this application, in the camera adjustment mode,

[0075] According to the grid voltage, frequency, phase and grid status, the speed of the generator set is adjusted through the converter, and the excitation voltage of the generator is adjusted through the power supply cabinet to achieve synchronous grid connection and grid-connected operation of the system. After successful grid connection, the main controller gives instructions and the converter enters the standby state;

[0076] The grid parameters are judged according to the threshold detection of each grid condition and the operating condition is selected.

[0077] Among them, judging the grid parameters according to the threshold detection of each grid condition and selecting the operating condition include:

[0078] Determine the no-load hot standby currently in normal operating conditions according to the power grid operating condition threshold;

[0079] Determine the grid inertia support in the current primary frequency regulation and steady-state voltage support demand operating conditions based on the grid condition threshold;

[0080] The fault support of the current operating condition providing fault support capability is determined according to the power grid condition threshold.

[0081] In summary, the present application provides a working method for a new energy power system, which has the advantages of harmonic-free voltage generation, inertial support, adjustable inertia, and flexible grid-connected voltage.

[0082] It can be understood that the method embodiment provided above corresponds to the device embodiment described above, and the corresponding specific contents can be referenced to each other and will not be repeated here.

[0083] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) that contain computer-usable program code.

[0084] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes 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 generate 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.

[0085] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction method, which is implemented in the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0086] 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.

[0087] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A working method of a new energy power system, characterized in that: The new energy power system comprises a multi-source complementary input device, a converter, a motor set and a generator, wherein the multi-source complementary input device, the converter, the motor set and the generator are connected in sequence; wherein a plurality of inertia adjustment units are arranged on the end of the shaft of the motor set away from the generator; the plurality of inertia adjustment units are used to change the mass of the rotating shaft and thus adjust the rotational inertia of the generator according to the linear positive correlation between the rotational inertia of the generator and the mass of the rotating shaft and the radius of the rotating shaft; the converter is controlled by a controller, and the controller controls the operation of the new energy power system, and the working method comprises: The controller receives the start command and starts the active / reactive power generation mode or the phase-shifting mode; When the active / reactive power generation mode is started, after receiving the voltage generated by multiple energy sources, the controller controls the converter to drive the motor frequency so that the motor frequency is the same as the grid frequency, and the power cabinet is used to send excitation pulses to establish the generator terminal voltage, realize synchronous grid connection, and receive dispatching instructions to perform active / reactive power generation; When the phase-shifting mode is started, after receiving the voltage generated by multiple energy sources, the controller controls the inverter to drag the motor frequency so that the motor frequency is the same as the grid frequency. The power cabinet sends an excitation pulse to establish the generator terminal voltage, achieve synchronous grid connection, disconnect the inverter, and receive dispatch instructions to perform reactive power generation.

2. The method according to claim 1, characterized in that Before starting the active / reactive generation mode or phase-shifting mode, it also includes: Determining the available energy of a multi-source complementary input device; Determine power data and grid status; the power data includes grid voltage, frequency and phase; Set the thresholds for each grid condition.

3. The method according to claim 2, characterized in that When the available energy of the multi-source complementary input device is greater than the system no-load operation power consumption, and the wind speed at the wind turbine unit site is greater than the cut-in wind speed, the active / reactive power generation mode is started; When the available energy of the multi-source complementary input device is greater than the system no-load operation power consumption, and the wind speed at the wind turbine unit position is less than the cut-in wind speed, the phase-shifting mode is started; When the available energy of the multi-source complementary input device is less than the system no-load operation power consumption, and the wind speed at the wind turbine unit position is greater than the cut-in wind speed, the controller starts the wind turbine unit, and the power generation output of the started wind turbine unit is stored in the energy storage module of the multi-source complementary input device through the DC bus until the available energy of the multi-source complementary input device is greater than the system no-load operation power consumption to start the active / reactive power generation mode; When the available energy of the multi-source complementary input device is less than the system no-load power consumption, the main controller starts the grid power rectifier in the DC bus cabinet, and the grid power is stored in the energy storage module through the DC bus until the available energy of the multi-source complementary input device is greater than the system no-load power consumption, and the phase-shifting mode is started.

4. The method according to claim 2, characterized in that: In active / reactive power generation mode, According to the grid voltage, frequency, phase and grid status, the speed of the generator set is adjusted through the converter, and the excitation voltage of the generator is adjusted through the power supply cabinet to achieve synchronous grid connection and system grid-connected operation; The grid parameters are judged according to the threshold detection of each grid condition and the operating condition is selected.

5. The method according to claim 4, characterized in that According to the threshold detection of each power grid condition, the power grid parameters are judged and the operating conditions are selected, including: Determine the grid inertia support in the current primary frequency regulation and steady-state voltage support demand operating conditions based on the grid condition threshold; The fault support of the current operating condition providing fault support capability is determined according to the power grid condition threshold.

6. The method according to claim 5, characterized in that During system operation, the controller monitors the wind speed in real time, which serves as the basis for calculating the maximum output capacity of wind power generation for the next control instruction of the controller.

7. The method according to claim 2, characterized in that In the camera adjustment mode, According to the grid voltage, frequency, phase and grid status, the speed of the generator set is adjusted through the converter, and the excitation voltage of the generator is adjusted through the power supply cabinet to achieve synchronous grid connection and grid-connected operation of the system. After successful grid connection, the main controller gives instructions and the converter enters the standby state; The grid parameters are judged according to the threshold detection of each grid condition and the operating condition is selected.

8. The method according to claim 7, characterized in that According to the threshold detection of each power grid condition, the power grid parameters are judged and the operating conditions are selected, including: Determine the no-load hot standby currently in normal operating conditions according to the power grid operating condition threshold; Determine the grid inertia support in the current primary frequency regulation and steady-state voltage support demand operating conditions based on the grid condition threshold; The fault support of the current operating condition providing fault support capability is determined according to the power grid condition threshold.

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