Working method of new energy power system

Abstract

The present application relates to a working method for a new energy power system. When starting the active / reactive power generation mode, after receiving the voltage, the controller controls the frequency of the converter to drive the motor so that the motor frequency is the same as the grid frequency, and uses the power supply cabinet to send excitation pulses to establish the generator terminal voltage, realizing synchronous grid connection, and receiving the dispatching instruction to perform active / reactive power generation; when starting the synchronous condenser mode, after receiving the voltage generated by multiple energy sources, the controller controls the frequency of the converter to drive the motor so that the motor frequency is the same as the grid frequency, and sends excitation pulses through the power supply cabinet to establish the generator terminal voltage. After grid connection, the converter is disconnected, and the dispatching instruction is received to perform reactive power generation. The present application can be applied to a new energy power generation system, including photovoltaic and wind power generation, and has the advantages of harmonic-free voltage power generation, inertial support, adjustable inertia, flexible grid connection voltage, etc., improving the safe and stable operation level of the UHV AC / DC power grid.

Description

Technical Field

[0001] This application belongs to the technical field of power markets, and particularly relates to a working method for a new energy power system. Background Art

[0002] A high-proportion new energy power grid is an inevitable future development trend in the energy and power field. 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 the system inertia, resulting in the power grid showing highly power electronic characteristics, and causing a fundamental change in the power source characteristics of the power grid, bringing great challenges to the stable operation of the power system.

[0003] In related technologies, the new energy grid connection lacks reliable inertia response and has low frequency tolerance ability, resulting in a decline in the frequency anti-disturbance ability of the power grid, and the transient voltage and current support ability of the new energy converter is insufficient, resulting in the problem of reduced fault ride-through ability of new energy. Summary of the Invention

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

[0005] To achieve the above purpose, this application adopts the following technical solution: A working method for a new energy power system,

[0006] The new energy power system includes a multi-source complementary input device, a converter, a motor, and a generator, which are connected in sequence; wherein, a plurality of inertia adjustment units are arranged at one end of the shaft of the motor far from the generator; the plurality of inertia adjustment units are used to change the shaft mass and thus adjust the rotational inertia of the generator according to the fact that the rotational inertia of the generator is linearly positively correlated with the mass of the shaft and the radius of the shaft. The converter is controlled by a controller, and the controller controls the operation of the new energy power system. The working method includes:

[0007] The controller receives a start command and starts the active / reactive power generation mode or the synchronous condenser mode;

[0008] When starting the active / reactive power generation mode, 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 uses the power supply cabinet to send excitation pulses to establish the generator terminal voltage, realizing synchronous grid connection, and receiving dispatching instructions for active / reactive power generation;

[0009] When the synchronous condenser mode is started, after receiving the voltage generated by multiple energy sources, the controller controls the frequency of the converter-driven motor so that the motor frequency is the same as the grid frequency. An excitation pulse is sent through the power supply cabinet to establish the generator terminal voltage, achieving synchronous grid connection. Then the converter is disconnected, and a reactive power generation command is received from the dispatcher for reactive power generation.

[0010] Further, before starting the active / reactive power generation mode or the synchronous condenser mode, it also includes:

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

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

[0013] Set the threshold values for each grid operating condition.

[0014] Further, when the available energy of the multi-source complementary input device is greater than the no-load operating power consumption of the system and the wind speed at the wind turbine position 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 no-load operating power consumption of the system and the wind speeds at all wind turbine positions are less than the cut-in wind speed, the synchronous condenser mode is started;

[0016] When the available energy of the multi-source complementary input device is less than the no-load operating power consumption of the system and the wind speed at the wind turbine position is greater than the cut-in wind speed, the controller starts the wind turbine. The generated power output of the started wind turbine 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 no-load operating power consumption of the system and the active / reactive power generation mode is started;

[0017] When the available energy of the multi-source complementary input device is less than the no-load operating power consumption of the system, the main controller starts the grid power rectifying device in the DC bus cabinet. 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 no-load operating power consumption of the system and the synchronous condenser mode is started.

[0018] Further, in the 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 the system operates in parallel;

[0020] Detect and judge the grid parameters according to the threshold values of each grid operating condition, and select the operating condition.

[0021] Further, detecting and judging the grid parameters according to the threshold values of each grid operating condition and selecting the operating condition includes:

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

[0023] Determine the fault support in the current fault support capacity providing operating condition according to the grid condition threshold.

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

[0025] Furthermore, in the synchronous condenser mode,

[0026] According to the grid voltage, frequency, phase, and grid state, adjust the speed of the generator set through the converter and adjust the excitation voltage of the generator through the power supply cabinet to achieve synchronous grid connection. After the system is connected to the grid and operates, after successful grid connection, the main controller gives an instruction and the converter enters the standby state;

[0027] Detect and judge the grid parameters according to each grid condition threshold, and select the operating condition.

[0028] Furthermore, detecting and judging the grid parameters according to each grid condition threshold and selecting the operating condition include:

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

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

[0031] Determine the fault support in the current fault support capacity providing operating condition according to the grid condition threshold.

[0032] The beneficial effects that can be achieved by the present application adopting the above technical solutions 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 synchronous condenser mode. When starting the active / reactive power generation mode, after receiving the voltage generated by multiple energy sources, the controller controls the frequency of the converter to drive the motor so that the motor frequency is the same as the grid frequency, and the power supply cabinet issues an excitation pulse to establish the terminal voltage of the generator, realizing synchronous grid connection, and receiving dispatching instructions for active / reactive power generation; when starting the synchronous condenser mode, after receiving the voltage generated by multiple energy sources, the controller controls the frequency of the converter to drive the motor so that the motor frequency is the same as the grid frequency, and the power supply cabinet issues an excitation pulse to establish the terminal voltage of the generator, realizing synchronous grid connection, disconnecting the converter, and receiving dispatching instructions for reactive power generation; the present application supports multiple energy sources, enabling new energy power generation to also have the advantages of traditional thermal and hydro power generation units, enhancing the inertia support and voltage support capabilities of new energy power stations, being more beneficial to the safe operation of the power grid, and improving the safe and stable operation level of UHV AC / DC power grids. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] Figure 1 is a schematic structural diagram of the new energy power system of the present application;

[0036] Figure 2 is a schematic diagram of the steps of the working method of the new energy power system of the present application;

[0037] Figure 3 is a schematic flow diagram of the working method of the new energy power system of the present application;

[0038] Figure 4 is a schematic flow diagram of the working method of the new energy power system of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] To make the objectives, technical solutions, and advantages of the present application clearer, the following will describe the technical solutions of the present application in detail. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments of the present application, all other implementation manners obtained by those of ordinary skill in the art without creative efforts fall within the scope protected by the present application.

[0040] The following introduces a specific working method of the new energy power system provided in the embodiments of the present application with reference to the 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, and a generator, and the multi-source complementary input device, the converter, the motor, and the generator are connected in sequence; wherein, a plurality of inertia adjustment units are arranged at one end of the shaft of the motor away from the generator; the plurality of inertia adjustment units are used to change the shaft mass and thus adjust the rotational inertia of the generator according to the fact that the rotational inertia of the generator is linearly positively correlated with the mass of the shaft and the radius of the shaft. The converter is controlled by a controller, and the controller controls the operation of the new energy power system, as follows Figure 2 shown, the working method includes

[0042] S101, the controller receives a start command and starts the active / reactive power generation mode or the synchronous condenser mode;

[0043] S102, when the active / reactive power generation mode is started, after receiving the voltage generated by multiple energy sources, the converter is controlled by the controller to drive the motor frequency so that the motor frequency is the same as the grid frequency, and an excitation pulse is sent by the power supply cabinet to establish the terminal voltage of the generator, realizing synchronous grid connection, and receiving a dispatching command for active / reactive power generation;

[0044] S103, when the synchronous condenser mode is started, after receiving the voltage generated by multiple energy sources, the converter is controlled by the controller to drive the motor frequency so that the motor frequency is the same as the grid frequency, an excitation pulse is sent by the power supply cabinet to establish the terminal voltage of the generator, realizing synchronous grid connection, disconnecting the converter, and receiving a dispatching command for reactive power generation.

[0045] The multi-source complementary device in the present application belongs to the energy input link, supports the access of multiple energy sources, and provides green energy input for the system; the converter 2 belongs to the conversion link, covering various types, such as DC / AC, AC / DC / AC, etc., and usually converts DC into AC to provide the required pulses for driving the motor; the motor is driven by the converter 2 to rotate and provides the driving force for the generator 4; the generator 4 is driven by the motor to rotate and generate alternating current for grid connection. The present 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 form of multi-energy complementarity. The introduction of the motor and the generator 4 enables new energy power generation to also have the advantages of traditional thermal and hydro power generation units, improves the inertia support and voltage support capabilities of new energy power stations, and is more beneficial to the safe operation of the power grid.

[0046] The new energy power generation system provided in this application. The multi-source complementary input device 1 in this application can generate electricity from wind energy and solar energy. When there is an excess of wind energy and solar energy, it can store the remaining energy. If the energy storage is full, it can consider green power to hydrogen production, etc. When the wind and light are insufficient, the energy storage system generates electricity, making the power transmission of the entire system 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 direct current or alternating current. The converter can convert the received current into alternating current to drive the motor 3, and the motor 3 is coaxially connected to the generator 4 to generate electricity, and the electricity generated by the generator 4 is used for grid connection.

[0047] It can be understood that the generator 4 in this application is compatible with multiple voltage levels, and the generator 4 supports power grids with different voltage levels such as 690V, 1140V, 3kV, 10kV, and 35kV. It supports high-voltage direct connection to the grid, saving the cost investment of step-up transformers and improving the reliability of the system.

[0048] The new energy power generation system provided in this application converges at the input side of the converter 2 and supports multiple energy sources, enabling new energy power generation to also have the advantages of traditional thermal and hydro power generation units, improving the inertia support and voltage support capabilities of new energy power stations, and being more beneficial to the safe operation of the power grid.

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

[0050] The plurality of inertia adjustment units are used to change the shaft mass and thus adjust the rotational inertia of the generator 4 according to the fact that the rotational inertia of the generator 4 is linearly positively correlated with the mass of the rotating shaft and the radius of the rotating shaft.

[0051] Among them, 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 in this application, the motor and the generator 4 adopt a coaxial design. The mass of the shaft 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, starting from the consideration of reducing losses in this application, a shared mechanical shaft design of the generator 4 and the motor is adopted. 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 is adjusted using 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 this application adopt a coaxial design, it is possible to set several 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 active / reactive power generation mode and phase-shifting mode.

[0055] like Figure 3 As shown in the figure, when the system operates in active / reactive power generation, it can generate power by receiving dispatch instructions, and at the same time generate capacitive reactive power or inductive reactive power, 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 emits excitation pulses, establishes the terminal voltage of generator 4, and dynamically adjusts the voltage of generator 4 so that its amplitude and phase with the grid voltage meet the grid connection conditions. Close the grid connection switch, and generator 4 is connected to the grid, and receives dispatch instructions to emit 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 emits excitation pulses, establishes the terminal voltage of generator 4, and dynamically adjusts the voltage of generator 4 so that its amplitude and phase with the grid voltage meet the grid connection conditions, close the grid connection switch, and generator 4 is connected to the grid. Disconnect the output switch 6 of converter 2 and accept 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 ultra-high voltage AC and DC power grids.

[0060] In some alternative embodiments, before starting the active / reactive power generation mode or the synchronous condenser mode, it further includes:

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

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

[0063] Set the threshold values for each grid operating condition.

[0064] Specifically, in this application, when the available energy of the multi-source complementary input device is greater than the no-load operating power consumption of the system and the wind speed at the wind turbine position 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 no-load operating power consumption of the system and the wind speeds at all wind turbine positions are less than the cut-in wind speed, the synchronous condenser mode is started;

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

[0067] When the available energy of the multi-source complementary input device is less than the no-load operating power consumption of the system, the main controller starts the grid power rectifying device 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 no-load operating power consumption of the system to start the synchronous condenser mode.

[0068] In this application, according to the grid voltage, frequency, phase, and grid state, the rotational 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 the system operates in parallel;

[0069] Detect and judge the grid parameters according to the threshold values of each grid operating condition, and select the operating condition.

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

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

[0072] Determine the fault support in the current operating condition of providing fault support ability according to the grid operating condition threshold values.

[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 data of the maximum power output capacity of wind power for the next control instruction of the controller.

[0074] In the synchronous condenser mode of this application,

[0075] According to the grid voltage, frequency, phase, and grid status, the speed of the generating unit is adjusted through the converter, and the excitation voltage of the generator is adjusted through the power supply cabinet to achieve synchronous grid connection. After the system is connected to the grid and operates, after successful grid connection, the master controller gives an instruction, and the converter enters the standby state;

[0076] Detect and judge the grid parameters according to the grid operating condition thresholds, and select the operating conditions.

[0077] Among them, detecting and judging the grid parameters according to the grid operating condition thresholds and selecting the operating conditions include:

[0078] Determine the no-load hot standby in the normal operating condition according to the grid operating condition thresholds;

[0079] Determine the grid inertia support in the primary frequency regulation and steady-state voltage support demand operating conditions according to the grid operating condition thresholds;

[0080] Determine the fault support in the operating condition of providing fault support ability according to the grid operating condition thresholds.

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

[0082] It can be understood that the above-provided method embodiments correspond to the above device embodiments, and the corresponding specific contents can be referred to each other, and will not be elaborated here.

[0083] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can 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.) containing computer-usable program code.

[0084] This application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows 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 the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in one or more flows and / or one or more blocks in the flow. Figure 1 one or more flows and / or blocks Figure 1 means for implementing the functions specified in one or more blocks.

[0085] These computer program instructions can 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 generate a manufactured article including the instruction method, and the instruction method implements the functions specified in one or more flows and / or one or more blocks in the flow. Figure 1 one or more flows and / or blocks Figure 1 means for implementing the functions specified in one or more blocks.

[0086] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more flows and / or one or more blocks in the flow. Figure 1 one or more flows and / or blocks Figure 1 steps for implementing the functions specified in one or more blocks.

[0087] As mentioned above, it is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed by this application can easily think of changes or substitutions, which should all be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claimed rights.

Claims

1. A working method of a new energy power system, characterized in that, The new energy power system includes a multi-source complementary input device, an inverter, a motor, and a generator, which are connected in sequence; wherein, a plurality of inertia adjustment units are arranged at one end of the shaft of the motor away from the generator; the plurality of inertia adjustment units are used to change the shaft mass and thus adjust the rotational inertia of the generator according to the linear positive correlation between the rotational inertia of the generator, the mass of the shaft, and the radius of the shaft; the inverter is controlled by a controller, and the controller controls the operation of the new energy power system. The operation method includes: The controller receives a start command and starts the active / reactive power generation mode or the synchronous condenser mode; When starting the active / reactive power generation mode, after receiving the voltage generated by multiple energy sources, the controller controls the inverter to drive the motor frequency through the controller, so that the motor frequency is the same as the grid frequency, and uses the power supply cabinet to send excitation pulses to establish the generator terminal voltage, realizing synchronous grid connection, and receiving the dispatching command to perform active / reactive power generation; When starting the synchronous condenser mode, after receiving the voltage generated by multiple energy sources, the controller controls the inverter to drive the motor frequency through the controller, so that the motor frequency is the same as the grid frequency, sends excitation pulses through the power supply cabinet to establish the generator terminal voltage, realizes synchronous grid connection, disconnects the inverter, and receives the dispatching command to perform reactive power generation; Before starting the active / reactive power generation mode or the synchronous condenser mode, it further includes: Determine the available energy of the multi-source complementary input device; Determine the power quantity data and the grid state; the power quantity data includes grid voltage, frequency, and phase; Set the threshold values of each grid operating condition; When the available energy of the multi-source complementary input device is greater than the no-load operating power consumption of the system, and the wind speed at the wind turbine position is greater than the cut-in wind speed, start the active / reactive power generation mode; When the available energy of the multi-source complementary input device is greater than the no-load operating power consumption of the system, and the wind speeds at the wind turbine positions are all less than the cut-in wind speed, start the synchronous condenser mode; When the available energy of the multi-source complementary input device is less than the no-load operating power consumption of the system, and the wind speed at the wind turbine position is greater than the cut-in wind speed, the controller starts the wind turbine, and the power generation output of the started wind turbine 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 no-load operating power consumption of the system and starts the active / reactive power generation mode; When the available energy of the multi-source complementary input device is less than the no-load operating power consumption of the system, the main controller starts the grid power rectifying device 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 no-load operating power consumption of the system and starts the synchronous condenser mode.

2. The method according to claim 1, wherein In the active / reactive power generation mode, According to the grid voltage, frequency, phase, and grid state, adjust the rotational speed of the generator set through the inverter, and adjust the generator excitation voltage through the power supply cabinet to realize synchronous grid connection, and the system operates in parallel; Detect and judge the grid parameters according to the threshold values of each grid operating condition, and select the operating condition.

3. The method according to claim 2, wherein Detect and judge the grid parameters according to the threshold values of each grid operating condition, and select the operating condition, including: Determine the grid inertia support in the current primary frequency regulation and steady-state voltage support demand operating conditions according to the grid operating condition threshold; Determine the fault support in the current fault support providing operating condition according to the grid operating condition threshold.

4. The method according to claim 3, wherein During the operation of the system, the controller monitors the wind speed in real time, which is used as the calculation basis for the maximum wind power output capacity data of the next control instruction of the controller.

5. The method according to claim 1, wherein In the synchronous condenser mode According to the grid voltage, frequency, phase and grid status, adjust the speed of the generator set through the converter, and adjust the excitation voltage of the generator through the power supply cabinet to achieve synchronous grid connection. After the system is connected to the grid and operates, after successful grid connection, the master controller gives an instruction and the converter enters the standby state; Detect and judge the grid parameters according to each grid operating condition threshold, and select the operating condition.

6. The method according to claim 5, characterized in that, Detect and judge the grid parameters according to each grid operating condition threshold, and select the operating condition, including: Determine the no-load hot standby in the current normal operating condition according to the grid operating condition threshold; Determine the grid inertia support in the current primary frequency regulation and steady-state voltage support demand operating conditions according to the grid operating condition threshold; Determine the fault support in the current fault support providing operating condition according to the grid operating condition threshold.

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