Wind turbine generator black start control method, device and equipment and storage medium

Abstract

The invention provides a wind turbine generator black start control method, device and equipment and a storage medium, and the method comprises the steps: starting an energy storage system under the condition that a wind power generation system loses voltage; controlling the energy storage system to supply power to an auxiliary power supply transformer of the wind power generation system; a converter of the wind power generation system is started, and an energy storage system is controlled to provide control electricity for the converter; obtaining the DC bus voltage of the converter; and controlling the converter to enter a voltage frequency control mode under the condition that the direct current bus voltage meets a preset condition. According to the application, the mainstream bus voltage is established through the energy storage system, the wind turbine generator is enabled to enter the black start state, and the converter is controlled to enter the voltage frequency control mode, so that the wind turbine generator has an ad-hoc network operation capability, can autonomously construct the power grid voltage and frequency, and can stably operate and generate power externally.

Description

Technical Field

[0001] The present application relates to the technical field of wind power generation, and in particular to a method, device, equipment and storage medium for controlling a black start of a wind turbine. Background Art

[0002] Power supply is closely related to people's lives. A major power outage will have serious consequences for society. Therefore, when a large area of ​​the receiving power grid is out of power, the power grid requires the sending power source to have black start capability to restore power supply as soon as possible. A power grid black start refers to the process of gradually restoring the operation of the power system through units with self-starting capabilities in the system or external power input after the power system is shut down due to a fault, thereby driving other units without self-starting capabilities to gradually restore the power supply of the entire power grid system.

[0003] At present, the main black start power sources are hydropower plants and thermal power plants, but large-scale renewable energy is replacing traditional synchronous machines to access the power grid. Therefore, renewable energy units should also have black start capabilities. For example, most wind power is located in mountainous areas with scarce surface water resources. Conventional black start hydropower units and gas turbines are relatively few, but wind resources are abundant. Implementing wind power black start in this area has certain advantages and is of great significance for accelerating the recovery of the power grid and reducing the economic losses caused by major power outages. However, there are few studies on the combination of black start and wind power generation, and the black start strategy based on hydropower units or thermal power units is not applicable to wind turbines. Summary of the invention

[0004] In view of this, the purpose of this application is to provide a wind turbine black start control method, device, equipment and storage medium, which can enable the wind turbine to independently build the grid voltage and frequency, operate stably and generate electricity externally. The specific technical solution is as follows:

[0005] In a first aspect, the present application provides a black start control method for a wind turbine generator set, the method comprising:

[0006] In case of a loss of pressure in the wind power generation system, starting the energy storage system;

[0007] Controlling the energy storage system to supply power to the auxiliary power supply transformer of the wind power generation system;

[0008] Starting the converter of the wind power generation system, and controlling the energy storage system to provide control power for the converter;

[0009] Obtaining a DC bus voltage of the converter;

[0010] When the DC bus voltage meets a preset condition, the converter is controlled to enter a voltage-frequency control mode.

[0011] In a possible implementation, controlling the energy storage system to supply power to the auxiliary power supply transformer of the wind power generation system includes:

[0012] An energy management system controlling the energy storage system sends a switch closing instruction to connect the wind power generation system with the energy storage system;

[0013] The energy storage system is controlled to supply power to the auxiliary power supply transformer.

[0014] In a possible implementation, starting the converter of the wind power generation system includes:

[0015] A main control unit controlling the wind power generation system sends a start-up command to start the converter.

[0016] In a possible implementation, the main control unit controlling the wind power generation system to send a startup instruction includes:

[0017] When the wind power generation system is in a connected state with the boost system, a main control unit controlling the wind power generation system sends a start command, and the wind turbine set further includes the boost system.

[0018] In a possible implementation, after controlling the converter to enter a voltage-frequency control mode when the DC bus voltage meets a preset condition, the method further includes:

[0019] Disconnect the wind power generation system from the energy storage system.

[0020] In a possible implementation, after controlling the converter to enter a voltage-frequency control mode when the DC bus voltage meets a preset condition, the method further includes:

[0021] Obtaining the high-voltage side voltage of the boost system;

[0022] When the voltage on the high-voltage side meets the closing condition, the boost system is connected to an external device.

[0023] In a second aspect, the present application further provides a wind turbine black start control device, wherein the wind turbine comprises a wind power generation system and an energy storage system, and the device comprises:

[0024] An energy storage starting module, used for starting the energy storage system when the wind power generation system loses pressure;

[0025] A transformer power supply module, used to control the energy storage system to supply power to the auxiliary power supply transformer of the wind power generation system;

[0026] A converter power supply module, used for starting the converter of the wind power generation system and controlling the energy storage system to provide control power for the converter;

[0027] A voltage acquisition module, used for acquiring the DC bus voltage of the converter;

[0028] The converter control module is used to control the converter to enter a voltage-frequency control mode when the DC bus voltage meets a preset condition.

[0029] In a possible implementation, the transformer power supply module includes:

[0030] A switch closing control unit, used to control the energy management system of the energy storage system to send a switch closing instruction so that the wind power generation system and the energy storage system are in a connected state;

[0031] A power supply control unit is used to control the energy storage system to supply power to the auxiliary power supply transformer.

[0032] In a third aspect, the present application further provides a computer device, characterized in that it includes: a memory and a processor;

[0033] Wherein, the memory is used to store computer programs;

[0034] The processor is used to execute the computer program in the memory to implement the method described in the first aspect or any one of the first aspects.

[0035] In a fourth aspect, the present application further provides a computer-readable storage medium, characterized in that it stores instructions that, when executed on a computer, enable the computer to execute the method described in the first aspect or any one of the first aspects.

[0036] In the present application, when the wind power generation system loses pressure, the energy storage system is started; the energy storage system is controlled to supply power to the auxiliary power supply transformer of the wind power generation system; the converter of the wind power generation system is started, and the energy storage system is controlled to provide control power to the converter; the DC bus voltage of the converter is obtained; when the DC bus voltage meets the preset conditions, the converter is controlled to enter the voltage-frequency control mode. The present application establishes the mainstream bus voltage through the energy storage system, puts the wind turbine into the black start state, and controls the converter to enter the voltage-frequency control mode, so that the wind turbine has the ability to operate in a self-organizing network, can independently construct the grid voltage and frequency, and enable the wind turbine to operate stably and generate electricity externally. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] 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 some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 A topological diagram of a low-voltage doubly-fed wind turbine generator system provided in an embodiment of the present application is shown;

[0039] Figure 2 A flow chart of a wind turbine black start control method provided in an embodiment of the present application is shown;

[0040] Figure 3 A topological diagram of a medium voltage doubly-fed wind turbine generator system provided in an embodiment of the present application is shown;

[0041] Figure 4 A schematic diagram of a virtual synchronization control provided by an embodiment of the present application is shown;

[0042] Figure 5 A schematic structural diagram of a wind turbine black start control device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0044] As the penetration rate of new energy in the power system continues to increase, the traditional power system is gradually transforming into a new power system, the characteristics of the power grid's "double highs" and "double peaks" are further highlighted, and security risks are increasing. In order to meet the requirements of safe power supply, new energy must take the responsibility of actively supporting the operation of the power grid.

[0045] Electricity supply is closely related to people's lives. A major power outage will have serious consequences for society. Therefore, when a large area of ​​the receiving power grid is out of power, the power grid requires the sending power supply to have black start capability to restore power supply as soon as possible. A power grid black start refers to the process of gradually restoring the operation of the system through units with self-starting capabilities in the system or external power input after the power system is shut down due to a fault, thereby driving other units without self-starting capabilities to gradually restore the power supply of the entire power grid system. At present, the main black start power sources in China are hydropower plants and thermal power plants, but large-scale new energy is replacing traditional synchronous machines to access the power grid, so the power grid requires new energy units to have black start capabilities.

[0046] The access of a large number of distributed power sources to the power grid has led to a gradually complex operating environment for the power grid. The normal operation and development of society are also very dependent on power resources. However, some natural disasters with strong destructive power or improper human operation may lead to major power outages, seriously affecting people's lives and property. After a major power outage, black start can maximize the use of available power in the power grid, give priority to restoring power to important loads, and reduce the losses caused by power outages. Therefore, the study of black start is of great significance for the restoration of power supply after a major power outage.

[0047] Hydropower is often preferred as a traditional black start power source due to its advantages such as fast startup speed and low power consumption. However, hydropower plants are located in a special geographical location and are far away from power consumption centers. In areas where water resources are scarce and wind energy resources are abundant, hydropower plants are no longer suitable as black start power sources. In recent years, with the increasing proportion of wind power in the power system, wind power has become one of the main new energy sources in the power grid. Therefore, for areas where wind power is developed and utilized on a large scale, wind turbines can be used as black start power sources. Considering that traditional grid-following wind turbines cannot independently build grid voltage and frequency, while grid-building wind turbines can independently build grid voltage and frequency, using grid-building wind turbines as black start power sources has a good development prospect.

[0048] The process of black start of wind turbines requires external auxiliary power to establish the mainstream bus voltage. Currently, the main external auxiliary power sources are energy storage power supplies and diesel generators. In the black start research based on energy storage power supplies, the wind farm is equipped with a battery energy storage system to compensate for power shortages and smooth power fluctuations. In the early stage of black start, the battery energy storage system is used to establish the bus voltage and frequency. After the double fed induction generator (DFIG) is connected to the grid, the battery energy storage system switches to active power / reactive power (P / Q) control. At this time, the grid voltage and frequency are maintained by the wind turbine. In the black start research based on diesel generators, in the initial stage of black start, the diesel generator connected in parallel to the DC bus of the wind turbine is used to provide excitation voltage for the DFIG. After the DFIG is successfully started, the diesel generator is disconnected. At this time, the DFIG is gradually connected to the important loads of the microgrid and other non-self-starting power sources as the main starting power supply.

[0049] DFIG is a type of generator widely used in wind power generation. Its principle is to maximize the electric energy input from wind energy through bidirectional power conversion technology, thereby improving the efficiency of the generator. In grid-type wind turbines, DFIG can adapt well to the changes in wind energy and improve the utilization rate of wind energy. At the same time, it can also improve the output power and stability of grid-type wind turbines. Therefore, DFIG is widely used in the design of grid-type wind turbines.

[0050] At present, the black start research on doubly-fed wind turbines is mainly based on low-voltage doubly-fed wind turbines. Figure 1 This is the topology diagram of a low-voltage doubly-fed wind turbine. The rated voltages of the stator and rotor sides are both 1140V. The two are directly connected and then connected to the grid through a 1140V / 35kV transformer.

[0051] Low-voltage doubly-fed wind turbines feed wind power into the grid through a two-winding transformer, while medium-voltage doubly-fed wind turbines feed the energy of the stator side and rotor side into the grid respectively through a three-winding transformer. With the promotion of medium-voltage doubly-fed wind turbines, considering the differences in topology and voltage level between medium-voltage doubly-fed wind turbines and low-voltage doubly-fed wind turbines, the black start strategy research based on low-voltage doubly-fed wind turbines is no longer applicable to medium-voltage doubly-fed wind turbines, and it is necessary to study the black start control strategy based on medium-voltage doubly-fed wind turbines.

[0052] Therefore, an embodiment of the present application provides a wind turbine black start control method, which can realize the black start operation of the medium-voltage doubly fed wind turbine type by controlling the various components of the wind turbine. From the perspective of grid adaptability, the active support capability of the medium-voltage doubly fed wind turbine is improved, and it has good grid stability. From the perspective of economy, the medium-voltage doubly fed wind turbine can save costs and improve power supply reliability.

[0053] See also Figure 2 , shows a flow chart of a wind turbine black start control method provided by an embodiment of the present application, and the embodiment of the present application at least includes the following steps:

[0054] S11, when the wind power generation system loses pressure, the energy storage system is started.

[0055] In the embodiment of the present application, the wind turbine generator set refers to a medium voltage double-fed wind turbine generator set. Figure 3 The topology diagram of a medium voltage double-fed wind turbine generator set is shown in FIG. The medium voltage double-fed wind turbine generator set may include a wind power generation system, an energy storage system and a boost system. The energy storage system may include a battery system, a power conversion system (PCS) cabinet and a transformer cabinet.

[0056] In the event of a power outage in the power grid, the medium-voltage doubly-fed wind turbine is not powered and the wind power generation system is in a de-voltage state. At this time, the wind power generation system and the boost system have no power, but the battery of the energy storage system has power, and the uninterruptible power supply (UPS) of the energy storage system has power.

[0057] Starting the energy storage system can be understood as turning on the energy storage cabinet UPS, energy storage transformer cabinet UPS and boost transformer UPS, among which the energy storage cabinet UPS refers to the UPS of the battery system, the energy storage transformer cabinet UPS refers to the UPS of the PCS cabinet, and the boost transformer UPS refers to the UPS of the transformer cabinet.

[0058] S12, controlling the energy storage system to supply power to the auxiliary power supply transformer of the wind power generation system.

[0059] After the energy storage system is started, the energy storage system is controlled to supply power to the auxiliary power supply transformer of the wind power generation system. When the wind power generation system is working normally, the wind power generation system and the energy storage system are disconnected. In order to enable the energy storage system to supply power to the wind power generation system, the wind power generation system and the energy storage system need to be connected.

[0060] The embodiment of the present application can control the energy management system (Energy Management System, EMS) of the energy storage system, and send a switch closing instruction to the energy storage box substation (Advanced RISC Machines, ARM). The switch closing instruction is used to instruct the closure of Q2 and KM4 so that the EMS controls the energy storage system to work and output AC voltage. The energy storage system is connected to the wind power generation system through Q2 and KM4. If Q2 and KM4 are both in a closed state, the energy storage system and the wind power generation system are in a connected state, and the link between the energy storage system and the wind power generation system is conductive. If Q2 and / or KM4 are in a disconnected state, the energy storage system and the wind power generation system are in a disconnected state, and the link between the energy storage system and the wind power generation system is not conductive.

[0061] When Q2 and KM4 are both in a closed state, the link between the energy storage system and the wind power generation system is connected, then the energy storage system can be controlled to supply power to the auxiliary power supply transformer. The auxiliary power supply transformer is connected to the auxiliary power supply system, and the auxiliary power supply system is respectively connected to the converter controller and the main control unit. Therefore, after the auxiliary power supply transformer is powered, the converter controller and the main control unit are also powered.

[0062] In the event of a power outage in the grid, the wind power generation system will be disconnected from the boost system, that is, disconnected from the grid, which is specifically reflected in the disconnection of QF7 and QF8. Therefore, after starting the energy storage system, the main control unit can control QF7 and QF8 to close to establish the connection between the wind power generation system and the boost system. The boost system is connected to the wind power generation system through QF7 and QF8, QF7 is connected to the DFIG through QF1 and KM1, and QF8 is connected to the converter through QF4 and KM6.

[0063] S13, starting the converter of the wind power generation system, and controlling the energy storage system to provide control power for the converter.

[0064] After the main control unit is powered on, the main control unit can be controlled to send a start-up command to the converter controller to start the converter.

[0065] Specifically, after the main control unit is powered, the main control unit can be controlled to increase the speed of the DFIG to a preset speed range, and when the speed of the DFIG increases to the preset speed range, the main control unit is controlled to issue a start command. The preset speed range can be set according to actual conditions.

[0066] Before the control main control unit issues a start command, or before the control main control unit increases the speed of the DFIG to a preset speed range, the embodiment of the present application can first determine whether the wind power generation system and the boost system are in a connected state, that is, determine whether QF7 and QF8 are closed. When the wind power generation system and the boost system are in a connected state, the control main control unit increases the speed of the DFIG to a preset speed range, and the control main control unit issues a start command.

[0067] Before the control main control unit issues the start-up command, the control main control unit can also be controlled to issue a mode switching command to the converter controller, so that the converter controller switches from the normal operating mode to the black start mode. After the control main control unit issues the mode switching command, the control main control unit can be controlled to close KM1 and QF1. When KM1, QF1, QF7 and QF8 are all in the closed state, the boost system and the wind power generation system are in a connected state, and the link between the boost system and the wind power generation system is turned on.

[0068] After starting the converter, the main control unit can be controlled to close KM2 so that the energy storage system can charge the DC bus of the converter, that is, to control the energy storage system to provide control power to the converter to slowly build up the stator voltage. After slowly raising the stator voltage to excite the ARM, the main control unit can be controlled to disconnect KM2, close KM6 and QF4, disconnect the energy storage system from the converter, and connect the link between the converter and the boost system. The energy storage system is connected to the converter through Q2, KM4, KM2, and the slow-start resistor.

[0069] S14, obtaining the DC bus voltage of the converter.

[0070] After the control energy storage system provides control power to the converter, the DC bus voltage of the converter is obtained.

[0071] S15, when the DC bus voltage meets the preset conditions, the converter is controlled to enter the voltage-frequency control mode.

[0072] The stator voltage is controlled to rise to 10.5kV. When the DC bus voltage of the converter meets the preset condition, the grid-side converter is controlled to start modulation, and the converter is controlled to black start and enter the self-constructing network state, that is, enter the voltage-frequency control mode. The converter includes a grid-side converter and a machine-side converter. The preset condition can be that the DC bus voltage is within a preset bus voltage range, and the preset bus voltage range can be set according to actual conditions.

[0073] After the converter enters the self-grid state, the main control unit can be controlled to disconnect KM4 and close KM3, disconnecting the wind power generation system from the energy storage system, so that the wind power generation system enters the black start self-sustaining state. The wind turbine runs with load in black start, and the black start is completed.

[0074] The embodiment of the present application can monitor the high-voltage side voltage of the boost system in real time through the converter. After the converter obtains the high-voltage side voltage, it informs the main control unit. When the high-voltage side voltage meets the closing condition, the main control unit can be controlled to close QF2, so that the boost system is connected to the external device, and an off-grid to grid-connected instruction is issued to convert the converter from the voltage-frequency control mode to the power generation mode, and the wind power generation system is converted from the off-grid state to the grid-connected state. The external device can be a power grid or other wind turbines.

[0075] The black start function requires the wind turbine to have the ability to self-organize the network, so the wind turbine needs to adopt a voltage source type network control strategy, among which the most commonly used network control strategy is virtual synchronization control, such as Figure 4 As shown, the virtual synchronous control strategy may include a power control loop and a voltage and current control loop. The power control loop may include a reactive-voltage control loop and an active-frequency control loop, which can autonomously construct the grid voltage and frequency and enable the wind turbine to operate stably and generate electricity externally. The converter enters the voltage and frequency control mode, that is, the converter performs virtual synchronous control.

[0076] In the power control loop, P s , Q s is the wind turbine stator output active power and stator output reactive power, P sref , Q sref Output active power command value and reactive power command value for wind turbines; U s is the voltage loop input reference; Mod2π represents the modulo controller; ∫ is the integral controller; K J is the inertia coefficient, K D is the droop coefficient; PI is the proportional integral controller; U ref is the voltage reference value of the wind turbine; ω s ,θ s are the stator angular frequency and stator phase angle under virtual synchronous control, ω sref is the stator angular frequency reference value.

[0077] In the voltage and current control loop, U sabc is the stator three-phase voltage, I sabc is the stator three-phase current; U rabc is the rotor three-phase voltage, I rabc is the rotor three-phase current; Park is the coordinate system transformation operation that converts the three-phase rotating coordinate system into the two-phase rotating coordinate system; U sd , U sq are the d-axis and q-axis components of the stator voltage in the two-phase rotating coordinate system; I rd ,I rq are the d-axis and q-axis components of the rotor current in the two-phase rotating coordinate system; Isd ,I sq are the d-axis and q-axis components of the stator current in the two-phase rotating coordinate system; I rdref ,I rqref is the command value; U rd , U rq are the d-axis and q-axis components of the rotor voltage in the two-phase rotating coordinate system; R v and L v are the stator resistance and reactance respectively, and ω is the stator angular frequency.

[0078] In an embodiment of the present application, when the wind power generation system loses pressure, the energy storage system is started; the energy storage system is controlled to supply power to the auxiliary power supply transformer of the wind power generation system; the converter of the wind power generation system is started, and the energy storage system is controlled to provide control power to the converter; the DC bus voltage of the converter is obtained; when the DC bus voltage meets the preset conditions, the converter is controlled to enter the voltage-frequency control mode. The embodiment of the present application establishes the mainstream bus voltage through the energy storage system, puts the wind turbine into the black start state, and controls the converter to enter the voltage-frequency control mode, so that the wind turbine has the ability to operate in a self-organizing network, can independently construct the grid voltage and frequency, and enable the wind turbine to operate stably and generate electricity externally.

[0079] The black start control method for a medium-voltage doubly-fed wind turbine set proposed in the embodiment of the present application can realize the black start operation of the medium-voltage doubly-fed wind turbine type, and from the perspective of grid adaptability, it can enhance the active support capability of the medium-voltage doubly-fed wind turbine set and have good grid stability; from the perspective of economy, on the one hand, the stator side voltage level of the medium-voltage doubly-fed wind turbine set is higher and the line loss is smaller; on the other hand, under the condition of constant power, the greater the voltage, the smaller the line current, and the more cost-effective the selection of switches and line protection periods, so the medium-voltage doubly-fed wind turbine set can save costs and improve power supply reliability.

[0080] Medium voltage double-fed wind turbines have outstanding advantages in terms of development cost, construction cost, operation and maintenance cost and reliability of wind power projects. Its "high voltage and low current" feature allows electrical components to have better temperature rise and higher reliability, which is not only conducive to the selection of electrical components, but also greatly reduces the number of cables and reduces the risk of cable twisting. 10kV direct access to the grid eliminates the need for step-up transformers, saving equipment costs, land costs, construction costs and operation and maintenance costs.

[0081] Based on the grid control strategy, the black start control strategy of the medium-voltage double-fed wind turbine can be studied to enable it to operate in an isolated island, giving full play to the ability of the grid-forming wind turbine to actively support the power grid. Through low-voltage excitation of the wind turbine, the transformer is closed at a lower voltage, and then the voltage is raised to the rated value, which reduces the impact of the wind turbine startup in the isolated island microgrid system and the excitation inrush current of the transformer.

[0082] Next, a wind turbine black start control device provided in an embodiment of the present application is introduced. The wind turbine black start control device introduced below and the wind turbine black start control method introduced above can refer to each other.

[0083] See also Figure 5 , shows a schematic structural diagram of a wind turbine black start control device provided in an embodiment of the present application, wherein the wind turbine includes a wind power generation system and an energy storage system, and the device includes:

[0084] An energy storage starting module 501 is used to start the energy storage system when the wind power generation system loses pressure;

[0085] A transformer power supply module 502, used to control the energy storage system to supply power to the auxiliary power supply transformer of the wind power generation system;

[0086] A converter power supply module 503, used to start the converter of the wind power generation system and control the energy storage system to provide control power for the converter;

[0087] A voltage acquisition module 504 is used to acquire the DC bus voltage of the converter;

[0088] The converter control module 505 is used to control the converter to enter a voltage-frequency control mode when the DC bus voltage meets a preset condition.

[0089] In the embodiment of the present application, the transformer power supply module 502 includes:

[0090] A switch closing control unit, used to control the energy management system of the energy storage system to send a switch closing instruction so that the wind power generation system and the energy storage system are in a connected state;

[0091] A power supply control unit is used to control the energy storage system to supply power to the auxiliary power supply transformer.

[0092] In the embodiment of the present application, the converter power supply module 503 includes:

[0093] A start control unit is used to control the main control unit of the wind power generation system to send a start command to start the converter.

[0094] In the embodiment of the present application, the startup control unit is specifically used to:

[0095] When the wind power generation system is in a connected state with the boost system, a main control unit controlling the wind power generation system sends a start command, and the wind turbine set further includes the boost system.

[0096] In the embodiment of the present application, the device further includes:

[0097] A disconnection module is used to disconnect the wind power generation system from the energy storage system.

[0098] In the embodiment of the present application, the device further includes:

[0099] An acquisition module, used for acquiring the high-voltage side voltage of the boost system;

[0100] The connection module is used to connect the boost system with an external device when the voltage on the high-voltage side meets the closing condition.

[0101] The embodiment of the present application also provides a computer device, including: a memory and a processor;

[0102] Wherein, the memory is used to store computer programs;

[0103] The processor is used to execute the computer program in the memory to implement the method described in the above method embodiment.

[0104] The embodiment of the present application also provides a computer-readable storage medium storing instructions, which, when executed on a computer, enables the computer to execute the method described in the above method embodiment.

[0105] In the embodiment of the present application, the energy storage starting module starts the energy storage system when the wind power generation system loses pressure; the transformer power supply module controls the energy storage system to supply power to the auxiliary power supply transformer of the wind power generation system; the converter power supply module starts the converter of the wind power generation system, and controls the energy storage system to provide control power to the converter; the voltage acquisition module acquires the DC bus voltage of the converter; the converter control module controls the converter to enter the voltage-frequency control mode when the DC bus voltage meets the preset conditions. The embodiment of the present application establishes the mainstream bus voltage through the energy storage system, puts the wind turbine into the black start state, and controls the converter to enter the voltage-frequency control mode, so that the wind turbine has the ability to operate in a self-organizing network, can independently construct the grid voltage and frequency, and make the wind turbine operate stably and generate electricity externally.

[0106] It should be noted that the same or similar parts between the various embodiments can be referred to each other. As for the device embodiment and the system embodiment, since they are basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0107] For the above-mentioned embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present application is not limited by the order of the actions described, because according to the present application, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0108] Finally, it should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0109] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0110] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A black start control method for a wind turbine generator set, It is characterized in that The wind turbine generator set includes a wind power generation system and an energy storage system, and the method includes: In case of a loss of pressure in the wind power generation system, starting the energy storage system; Controlling the energy storage system to supply power to the auxiliary power supply transformer of the wind power generation system; Starting the converter of the wind power generation system, and controlling the energy storage system to provide control power for the converter; Obtaining a DC bus voltage of the converter; When the DC bus voltage meets a preset condition, the converter is controlled to enter a voltage-frequency control mode.

2. The method according to claim 1, It is characterized in that The controlling the energy storage system to supply power to the auxiliary power supply transformer of the wind power generation system comprises: An energy management system controlling the energy storage system sends a switch closing instruction so that the wind power generation system is in a connected state with the energy storage system; The energy storage system is controlled to supply power to the auxiliary power supply transformer.

3. The method according to claim 1 or 2, It is characterized in that The method of starting the converter of the wind power generation system comprises: A main control unit controlling the wind power generation system sends a start-up command to start the converter.

4. The method according to claim 3, It is characterized in that The main control unit controlling the wind power generation system to send a startup instruction comprises: When the wind power generation system is in a connected state with the boost system, a main control unit controlling the wind power generation system sends a start command, and the wind turbine generator set further includes the boost system.

5. The method according to claim 1 or 2, It is characterized in that After controlling the converter to enter a voltage-frequency control mode when the DC bus voltage meets a preset condition, the method further includes: Disconnect the wind power generation system from the energy storage system.

6. The method according to claim 1 or 2, It is characterized in that After controlling the converter to enter a voltage-frequency control mode when the DC bus voltage meets a preset condition, the method further includes: Obtaining the high-voltage side voltage of the boost system; When the voltage on the high-voltage side meets the closing condition, the boost system is connected to an external device.

7. A wind turbine black start control device, It is characterized in that The wind turbine generator set includes a wind power generation system and an energy storage system, and the device includes: An energy storage starting module, used for starting the energy storage system when the wind power generation system loses pressure; A transformer power supply module, used to control the energy storage system to supply power to the auxiliary power supply transformer of the wind power generation system; A converter power supply module, used for starting the converter of the wind power generation system and controlling the energy storage system to provide control power for the converter; A voltage acquisition module, used to acquire the DC bus voltage of the converter; The converter control module is used to control the converter to enter a voltage-frequency control mode when the DC bus voltage meets a preset condition.

8. The device according to claim 7, It is characterized in that The transformer power supply module comprises: A switch closing control unit, used to control the energy management system of the energy storage system to send a switch closing instruction so that the wind power generation system and the energy storage system are in a connected state; A power supply control unit is used to control the energy storage system to supply power to the auxiliary power supply transformer.

9. A computer device, It is characterized in that include: Memory and processor; The memory is used to store computer programs; The processor is configured to execute the computer program in the memory to implement the method according to any one of claims 1 to 6.

10. A computer-readable storage medium, It is characterized in that The device stores instructions which, when executed on a computer, cause the computer to execute the method according to any one of claims 1 to 6.

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