Black-start operation control method and system for fan

Abstract

The invention provides a fan black-start operation control method and system.The method comprises the steps that when a fan black-start instruction is received, a first control instruction for a direct-current bus to be externally connected with a direct-current power source is generated; and according to the first control instruction of the direct-current power supply externally connected with the direct-current bus, a fan black-start operation control device is controlled to generate an initial excitation voltage, and the initial excitation voltage is sent to the fan, so that black start of the fan is realized. According to the technical scheme, black start is rapidly and stably achieved to supply power to auxiliary machines such as yaw systems of other units in the wind power plant, and the equipment safety of the wind power plant is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of wind turbine black start, and in particular to a wind turbine black start operation control method and system. Background Art

[0002] Black start means that after the entire power system is completely out of power due to a fault, the units with self-starting capability in the system drive the units without self-starting capability without relying on the help of other systems, gradually expanding the scope of system recovery and finally achieving the recovery of the entire system. The existing black start does not solve the initial excitation problem of wind turbines during black start, resulting in slow start speed and poor stability. Therefore, it is urgent to propose a solution that can quickly and stably perform black start of wind turbines. Summary of the invention

[0003] The present application provides a wind turbine black start operation control method and system, so as to at least solve the technical problem that the existing black start fails to solve the initial excitation of the wind turbine generator set during the black start.

[0004] The first embodiment of the present application provides a black start operation control method for a wind turbine, the method comprising:

[0005] When a black start instruction for the wind turbine is received, a first control instruction for connecting the DC bus to an external DC power supply is generated;

[0006] According to the first control instruction of the DC bus external DC power supply, the fan black start operation control device is controlled to generate an initial excitation voltage, and the initial excitation voltage is sent to the fan to achieve the black start of the fan.

[0007] Preferably, the wind turbine black start operation control device comprises: a rectifier, a DC bus external DC power supply, an inverter and a grid-side filter component;

[0008] The input end of the rectifier is connected to the fan, and the output end of the rectifier is connected to the input end of the DC bus external DC power supply;

[0009] The output end of the DC bus external DC power supply is connected to the input end of the inverter, and the output end of the inverter is connected to the input end of the grid-side filter component;

[0010] The output end of the grid-side filter component is connected to the input end of the grid.

[0011] Furthermore, the DC bus external DC power supply includes: a DC power supply, a DC power supply switching switch, a resistance element and a capacitor;

[0012] One end of the DC power supply switching switch is connected to the positive wire between the rectifier and the inverter, the other end of the DC power supply switching switch is connected to one end of the DC power supply, the other end of the DC power supply is connected to one end of the resistor element, and the other end of the resistor element is connected to the negative wire between the rectifier and the inverter;

[0013] One end of the capacitor is connected to the positive wire between the rectifier and the inverter, and the other end is connected to the negative wire between the rectifier and the inverter.

[0014] Furthermore, the first control instruction of the DC bus external DC power supply includes:

[0015] Close the DC power supply switching switch.

[0016] Furthermore, the method further comprises:

[0017] When the black start of the wind turbine is successful, a second control instruction for connecting the DC bus to an external DC power supply is generated;

[0018] Controlling the wind turbine black start operation control device based on the second control instruction of the DC bus external DC power supply;

[0019] The second control instruction for connecting the DC bus to an external DC power supply includes: disconnecting the DC power supply switching switch.

[0020] The second aspect of the present application provides a wind turbine black start operation control system, including:

[0021] A first generating module is used to generate a first control instruction for a DC bus externally connected DC power supply when receiving a black start instruction for the wind turbine;

[0022] The first control module is used to control the fan black start operation control device to generate an initial excitation voltage according to the first control instruction of the DC bus external DC power supply, and send the initial excitation voltage to the fan to achieve the black start of the fan.

[0023] Preferably, the wind turbine black start operation control device comprises: a rectifier, a DC bus external DC power supply, an inverter and a grid-side filter component;

[0024] The input end of the rectifier is connected to the fan, and the output end of the rectifier is connected to the input end of the DC bus external DC power supply;

[0025] The output end of the DC bus external DC power supply is connected to the input end of the inverter, and the output end of the inverter is connected to the input end of the grid-side filter component;

[0026] The output end of the grid-side filter component is connected to the input end of the grid.

[0027] Furthermore, the DC bus external DC power supply includes: a DC power supply, a DC power supply switching switch, a resistance element and a capacitor;

[0028] One end of the DC power supply switching switch is connected to the positive wire between the rectifier and the inverter, the other end of the DC power supply switching switch is connected to one end of the DC power supply, the other end of the DC power supply is connected to one end of the resistor element, and the other end of the resistor element is connected to the negative wire between the rectifier and the inverter;

[0029] One end of the capacitor is connected to the positive wire between the rectifier and the inverter, and the other end is connected to the negative wire between the rectifier and the inverter.

[0030] Furthermore, the first control instruction of the DC bus external DC power supply includes:

[0031] Close the DC power supply switching switch.

[0032] Furthermore, the system also includes:

[0033] A second generating module is used to generate a second control instruction for connecting a DC bus to an external DC power supply when the wind turbine black start succeeds;

[0034] A second control module, used for controlling the wind turbine black start operation control device based on a second control instruction of the DC bus external DC power supply;

[0035] The second control instruction for connecting the DC bus to an external DC power supply includes: disconnecting the DC power supply switching switch.

[0036] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0037] The present application proposes a wind turbine black start operation control method and system, the method comprising: when receiving a wind turbine black start instruction, generating a first control instruction for a DC bus external DC power supply; controlling a wind turbine black start operation control device to generate an initial excitation voltage according to the first control instruction for the DC bus external DC power supply, and sending the initial excitation voltage to the wind turbine to achieve a wind turbine black start. The technical solution proposed in the present application can quickly and stably achieve a black start to power auxiliary machines such as the yaw system of other units in the wind farm, thereby ensuring the safety of the wind farm equipment.

[0038] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0040] Figure 1 A flowchart of a wind turbine black start operation control method provided according to an embodiment of the present application;

[0041] Figure 2 A structural diagram of a wind turbine black start operation control device connected to a wind turbine power grid according to an embodiment of the present application;

[0042] Figure 3 A first structural diagram of a wind turbine black start operation control system provided according to an embodiment of the present application;

[0043] Figure 4 A second structural diagram of a wind turbine black start operation control system provided according to an embodiment of the present application;

[0044] Reference numerals

[0045] Wind turbine 101 , rectifier 102 , DC bus external DC power supply 103 , inverter 104 , grid-side filter component 105 , and power grid 106 . DETAILED DESCRIPTION

[0046] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0047] The present application proposes a wind turbine black start operation control method and system, the method comprising: when receiving a wind turbine black start instruction, generating a first control instruction for a DC bus external DC power supply; controlling the wind turbine black start operation control device to generate an initial excitation voltage according to the first control instruction for the DC bus external DC power supply, and sending the initial excitation voltage to the wind turbine to achieve a black start of the wind turbine. The technical solution proposed in the present application can quickly and stably achieve a black start to supply power to auxiliary machines such as the yaw system of other units in the wind farm, thereby ensuring the equipment safety of the wind farm.

[0048] A wind turbine black start operation control method and system according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0049] Embodiment 1

[0050] Figure 1 Flow chart of a wind turbine black start operation control method provided according to one embodiment of the present application, such as Figure 1 As shown, the method includes:

[0051] Step 1: When a black start instruction of a wind turbine is received, a first control instruction of a DC bus externally connected to a DC power supply is generated.

[0052] It should be noted that the first control instruction of the DC bus external DC power supply includes:

[0053] Close the DC power supply switching switch.

[0054] Step 2: According to the first control instruction of the DC bus external DC power supply, the black start operation control device of the fan is controlled to generate an initial excitation voltage, and the initial excitation voltage is sent to the fan to realize the black start of the fan.

[0055] In the embodiments of the present disclosure, Figure 2 As shown, the wind turbine black start operation control device includes: a rectifier 102, a DC bus external DC power supply 103, an inverter 104 and a grid-side filter component 105;

[0056] The input end of the rectifier 102 is connected to the fan 101, and the output end of the rectifier 102 is connected to the input end of the DC bus external DC power supply 103;

[0057] The output end of the DC bus external DC power supply 103 is connected to the input end of the inverter 104, and the output end of the inverter 3 is connected to the input end of the grid-side filter component 105;

[0058] The output end of the grid-side filter component 105 is connected to the input end of the power grid 106 .

[0059] It should be noted that the DC bus external DC power supply 2 includes: a DC power supply Udc, a DC power supply switching switch S1, a resistor element R and a capacitor C;

[0060] One end of the DC power switching switch S1 is connected to the positive wire between the rectifier 102 and the inverter 104, the other end of the DC power switching switch S1 is connected to one end of the DC power supply Udc, the other end of the DC power supply Udc is connected to one end of the resistor R, and the other end of the resistor R is connected to the negative wire between the rectifier 1 and the inverter 3;

[0061] One end of the capacitor C is connected to the positive wire between the rectifier 102 and the inverter 104 , and the other end of the capacitor C is connected to the negative wire between the rectifier 102 and the inverter 104 .

[0062] In an embodiment of the present disclosure, the method further includes:

[0063] When the wind turbine black start is successful, a second control instruction for connecting the DC bus to an external DC power supply is generated;

[0064] Controlling the wind turbine black start operation control device based on the second control instruction of the DC bus external DC power supply;

[0065] The second control instruction for connecting the DC bus to an external DC power supply includes: disconnecting the DC power supply switching switch S1.

[0066] For example, taking the black start of a doubly-fed asynchronous wind turbine generator set as an example, when the black start process starts, the switch S1 in the DC bus external DC power supply (103) is closed, and the DC bus external DC power supply (103) starts to provide the initial excitation voltage to the doubly-fed asynchronous wind turbine generator in the wind turbine (101) through the rectifier (102) to help it start. When the wind turbine (101) has been successfully started and a stable voltage and frequency have been established in the power grid (106), the switch S1 in the DC bus external DC power supply (103) is disconnected, and the doubly-fed asynchronous wind turbine generator can operate independently and cope with the impact caused by the load input, and finally gradually form a low-voltage microgrid to supply power to auxiliary machines such as the yaw system of other units in the wind farm, thereby ensuring the safety of the equipment in the wind farm, which has positive significance for the next step of studying the use of wind farms to drive the recovery of large power grids.

[0067] The wind turbine black start operation control method provided in this embodiment has the following advantages:

[0068] 1. The initial excitation problem of the wind turbine generator set during black start is solved by connecting an external DC voltage source to the wind power converter;

[0069] 2. Establish stable voltage and frequency by giving the fan initial excitation. After the system runs independently, the DC voltage source can be cut off to complete the fan black start;

[0070] 3. The black start of wind turbines can supply power to auxiliary equipment such as the yaw systems of other units in the wind farm, ensuring the safety of equipment in the wind farm. This has positive significance for the next step of studying how to use wind farms to drive the restoration of large power grids.

[0071] In summary, the wind turbine black start operation control method proposed in this embodiment can quickly and stably realize black start to supply power to auxiliary machines such as the yaw systems of other units in the wind farm, thereby ensuring the safety of the equipment in the wind farm.

[0072] Embodiment 2

[0073] Figure 3 : is a structural diagram of a wind turbine black start operation control system provided according to one embodiment of the present application, such as Figure 3 As shown, the system comprises:

[0074] The first generating module 100 is used to generate a first control instruction for connecting a DC bus to an external DC power supply when receiving a black start instruction for a wind turbine;

[0075] The first control module 200 is used to control the wind turbine black start operation control device to generate an initial excitation voltage according to the first control instruction of the DC bus external DC power supply, and send the initial excitation voltage to the wind turbine to achieve a black start of the wind turbine.

[0076] It should be noted that the wind turbine black start operation control device includes: a rectifier, a DC bus external DC power supply, an inverter and a grid-side filter component;

[0077] The input end of the rectifier is connected to the fan, and the output end of the rectifier is connected to the input end of the DC bus external DC power supply;

[0078] The output end of the DC bus external DC power supply is connected to the input end of the inverter, and the output end of the inverter is connected to the input end of the grid-side filter component;

[0079] The output end of the grid-side filter component is connected to the input end of the grid.

[0080] Wherein, the DC bus external DC power supply includes: a DC power supply, a DC power supply switching switch, a resistance element and a capacitor;

[0081] One end of the DC power supply switching switch is connected to the positive wire between the rectifier and the inverter, the other end of the DC power supply switching switch is connected to one end of the DC power supply, the other end of the DC power supply is connected to one end of the resistor element, and the other end of the resistor element is connected to the negative wire between the rectifier and the inverter;

[0082] One end of the capacitor is connected to the positive wire between the rectifier and the inverter, and the other end is connected to the negative wire between the rectifier and the inverter.

[0083] It should be noted that the first control instruction of the DC bus external DC power supply includes:

[0084] Close the DC power supply switching switch.

[0085] In the embodiments of the present disclosure, Figure 4 As shown, the system also includes:

[0086] The second generating module 300 is used to generate a second control instruction for connecting the DC bus to an external DC power supply when the wind turbine black start succeeds;

[0087] A second control module 400, configured to control the wind turbine black start operation control device based on a second control instruction of the DC bus external DC power supply;

[0088] The second control instruction for connecting the DC bus to an external DC power supply includes: disconnecting the DC power supply switching switch.

[0089] In summary, the wind turbine black start operation control system proposed in this embodiment can quickly and stably realize black start to supply power to auxiliary machines such as the yaw systems of other units in the wind farm, thereby ensuring the safety of the equipment in the wind farm.

[0090] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0091] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0092] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A wind turbine black start operation control method, characterized in that: The method comprises: When a black start instruction for the wind turbine is received, a first control instruction for connecting the DC bus to an external DC power supply is generated; According to the first control instruction of the DC bus external DC power supply, the fan black start operation control device is controlled to generate an initial excitation voltage, and the initial excitation voltage is sent to the fan to achieve the black start of the fan.

2. The method according to claim 1, characterized in that The wind turbine black start operation control device comprises: a rectifier, a DC bus external DC power supply, an inverter and a grid-side filter component; The input end of the rectifier is connected to the fan, and the output end of the rectifier is connected to the input end of the DC bus external DC power supply; The output end of the DC bus external DC power supply is connected to the input end of the inverter, and the output end of the inverter is connected to the input end of the grid-side filter component; The output end of the grid-side filter component is connected to the input end of the grid.

3. The method according to claim 2, characterized in that The DC bus external DC power supply includes: a DC power supply, a DC power supply switching switch, a resistance element and a capacitor; One end of the DC power supply switching switch is connected to the positive wire between the rectifier and the inverter, the other end of the DC power supply switching switch is connected to one end of the DC power supply, the other end of the DC power supply is connected to one end of the resistor element, and the other end of the resistor element is connected to the negative wire between the rectifier and the inverter; One end of the capacitor is connected to the positive wire between the rectifier and the inverter, and the other end is connected to the negative wire between the rectifier and the inverter.

4. The method according to claim 3, characterized in that The first control instruction of the DC bus external DC power supply includes: Close the DC power supply switching switch.

5. The method according to claim 4, characterized in that The method further comprises: When the wind turbine black start is successful, a second control instruction for connecting the DC bus to an external DC power supply is generated; Controlling the wind turbine black start operation control device based on the second control instruction of the DC bus external DC power supply; The second control instruction for connecting the DC bus to an external DC power supply includes: disconnecting the DC power supply switching switch.

6. A wind turbine black start operation control system, characterized in that: The system comprises: A first generating module is used to generate a first control instruction for a DC bus externally connected DC power supply when receiving a black start instruction for the wind turbine; The first control module is used to control the fan black start operation control device to generate an initial excitation voltage according to the first control instruction of the DC bus external DC power supply, and send the initial excitation voltage to the fan to achieve the black start of the fan.

7. The system according to claim 6, characterized in that The wind turbine black start operation control device comprises: a rectifier, a DC bus external DC power supply, an inverter and a grid-side filter component; The input end of the rectifier is connected to the fan, and the output end of the rectifier is connected to the input end of the DC bus external DC power supply; The output end of the DC bus external DC power supply is connected to the input end of the inverter, and the output end of the inverter is connected to the input end of the grid-side filter component; The output end of the grid-side filter component is connected to the input end of the grid.

8. The system according to claim 7, characterized in that The DC bus external DC power supply includes: a DC power supply, a DC power supply switching switch, a resistance element and a capacitor; One end of the DC power supply switching switch is connected to the positive wire between the rectifier and the inverter, the other end of the DC power supply switching switch is connected to one end of the DC power supply, the other end of the DC power supply is connected to one end of the resistor element, and the other end of the resistor element is connected to the negative wire between the rectifier and the inverter; One end of the capacitor is connected to the positive wire between the rectifier and the inverter, and the other end is connected to the negative wire between the rectifier and the inverter.

9. The system according to claim 8, characterized in that The first control instruction of the DC bus external DC power supply includes: Close the DC power supply switching switch.

10. The system according to claim 9, characterized in that The system further comprises: A second generating module is used to generate a second control instruction for connecting a DC bus to an external DC power supply when the wind turbine black start succeeds; A second control module, used for controlling the wind turbine black start operation control device based on a second control instruction of the DC bus external DC power supply; The second control instruction for connecting the DC bus to an external DC power supply includes: disconnecting the DC power supply switching switch.

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