Fan black-start control device based on direct-current power supply

Abstract

The invention provides a fan black-start control device based on a direct-current power source. The device comprises a direct-current power source module, a rectifier, a first inverter and a network side filtering assembly. The input end of the direct-current power supply module is connected with a fan, and the output end of the direct-current power supply module is connected with the input end of the rectifier; the output end of the rectifier is connected with the input end of the first inverter, and the output end of the first inverter is connected with the input end of the network side filtering assembly; the output end of the network side filtering assembly is connected with the input end of a power grid; wherein the direct-current power supply module is used for providing electric energy for the fan during black start, so that the black start of the fan is realized. According to the technical scheme, the problem of initial excitation of the wind generating set during black start is solved, and black start of the fan can be stably achieved.

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 control device based on a direct current power supply. 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 control device based on a direct current power supply, 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 wind turbine black start control device based on a DC power supply, the device comprising:

[0005] A DC power supply module, a rectifier, a first inverter and a grid-side filter component;

[0006] The input end of the DC power module is connected to the fan, and the output end of the DC power module is connected to the input end of the rectifier;

[0007] The output end of the rectifier is connected to the input end of the first inverter, and the output end of the first inverter is connected to the input end of the grid-side filter component;

[0008] The output end of the grid-side filter component is connected to the input end of the grid;

[0009] Wherein, the DC power supply module is used to provide electric energy to the wind turbine during a black start, so as to realize a black start of the wind turbine.

[0010] Preferably, the device further comprises: a capacitor;

[0011] The capacitor is connected in parallel between the rectifier and the first inverter;

[0012] The capacitor is used to filter out the ripples of the voltage and current output by the rectifier.

[0013] Furthermore, the DC power supply module includes: a DC power supply, a DC power supply switching switch, a resistance element, and a second inverter;

[0014] The DC power supply switching switch, the DC power supply, and the resistance element are connected in series in sequence;

[0015] The DC power supply switching switch is connected to the DC end of the second inverter, and the resistance element is connected to the DC end of the second inverter;

[0016] The AC end of the second inverter is connected to the fan and the input end of the rectifier.

[0017] Further, the resistance value of the resistance element is R;

[0018] Where R ≥ U dc i cm , where U dc is the voltage value of the DC power supply output, i cm It is the upper limit of the inrush current.

[0019] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0020] The present application proposes a wind turbine black start control device based on a DC power supply, the device comprising: a DC power supply module, a rectifier, a first inverter and a grid-side filter component; the input end of the DC power supply module is connected to the wind turbine, the output end of the DC power supply module is connected to the input end of the rectifier; the output end of the rectifier is connected to the input end of the first inverter, the output end of the first 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 power grid; wherein the DC power supply module is used to provide electrical energy to the wind turbine during a black start to achieve a black start of the wind turbine. The technical solution proposed in the present application solves the problem of initial excitation of a wind turbine generator set during a black start, and can stably achieve a black start of a wind turbine.

[0021] 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

[0022] 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:

[0023] Figure 1 A block diagram of a wind turbine black start control device based on a DC power supply according to an embodiment of the present application;

[0024] Figure 2 A detailed structural diagram of a wind turbine black start control device based on a DC power supply connected to a wind turbine and a power grid according to an embodiment of the present application;

[0025] Reference numerals

[0026] DC power supply module 1, rectifier 2, first inverter 3, grid-side filter component 4, capacitor 5, fan 101, grid 102, DC power supply 1-1, DC power supply switching switch 1-2, resistor element 1-3, second inverter 1-4. DETAILED DESCRIPTION

[0027] 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.

[0028] The present application proposes a wind turbine black start control device based on a DC power supply, the device comprising: a DC power supply module, a rectifier, a first inverter and a grid-side filter component; the input end of the DC power supply module is connected to the wind turbine, the output end of the DC power supply module is connected to the input end of the rectifier; the output end of the rectifier is connected to the input end of the first inverter, the output end of the first 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 power grid; wherein the DC power supply module is used to provide electric energy to the wind turbine during a black start to achieve a black start of the wind turbine. The technical solution proposed in the present application solves the problem of initial excitation of a wind turbine generator set during a black start, and can stably achieve a black start of a wind turbine.

[0029] A wind turbine black start control device based on a DC power supply according to an embodiment of the present application is described below with reference to the accompanying drawings.

[0030] Embodiment 1

[0031] Figure 1 FIG. 1 is a structural diagram of a wind turbine black start control device based on a DC power supply according to an embodiment of the present application, such as Figure 1 As shown, the device comprises: a DC power supply module 1, a rectifier 2, a first inverter 3 and a grid-side filter component 4;

[0032] The input end of the DC power module 1 is connected to the fan 101, and the output end of the DC power module 1 is connected to the input end of the rectifier 2;

[0033] The output end of the rectifier 2 is connected to the input end of the first inverter 3, and the output end of the first inverter 3 is connected to the input end of the grid-side filter component 4;

[0034] The output end of the grid-side filter component 4 is connected to the input end of the grid 102;

[0035] The DC power supply module 1 is used to provide electric energy to the wind turbine during a black start, thereby realizing a black start of the wind turbine.

[0036] It should be noted that Figure 1 This is only an illustration of a wind turbine black start control device based on a DC power supply proposed in this embodiment, and does not limit the structure of a wind turbine black start control device based on a DC power supply in this application.

[0037] In the embodiments of the present disclosure, Figure 2 As shown, the device further includes: a capacitor 5;

[0038] The capacitor 5 is connected in parallel between the rectifier 2 and the first inverter 3;

[0039] The capacitor 5 is used to filter out the ripples of the voltage and current output by the rectifier 2 .

[0040] Further, such as Figure 2 As shown, the DC power supply module 1 includes: a DC power supply 1-1, a DC power supply switching switch 1-2, a resistance element 1-3, and a second inverter 1-4;

[0041] The DC power supply switching switch 1-2, the DC power supply 1-1, and the resistance element 1-3 are connected in series in sequence;

[0042] The DC power supply switching switch 1-2 is connected to the DC end of the second inverter 1-4, and the resistance element 1-3 is connected to the DC end of the second inverter 1-4;

[0043] The AC end of the second inverter 1 - 4 is connected to the wind turbine 101 and the input end of the rectifier 2 .

[0044] It should be noted that the resistance value of the resistor element 1-3 is R;

[0045] Where R ≥ U dc i cm , where U dc is the voltage value of the DC power supply output, i cm It is the upper limit of the inrush current.

[0046] It should be noted that Figure 2 In the figure, Udc is the DC power supply 1-1, and S1 is the DC power supply switching switch 1-2.

[0047] For example, Figure 2As shown, taking the black start of a doubly-fed asynchronous wind turbine generator set as an example, when the black start process begins, the DC power supply switching switch S1 in the DC power supply module 1 is closed, and the DC power supply module 1 then starts to provide the initial excitation voltage to the doubly-fed asynchronous wind turbine generator in the wind turbine 101 through the rectifier 2 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 102, the switch S1 in the DC power supply module 1 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 the remaining units in the wind farm, and ensure the safety of the equipment in the wind farm, which is of positive significance for the next step of studying the use of wind farms to drive the recovery of large power grids.

[0048] The black start control device for a fan based on a DC power supply proposed in this application has the following advantages:

[0049] 1. The initial excitation problem of the wind turbine generator set during black start is solved by connecting an external DC power supply module to the AC input side of the wind power converter;

[0050] 2. Establish stable voltage and frequency by initially exciting the fan. After the system runs independently, the external DC power supply module can be removed to complete the black start of the fan;

[0051] 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.

[0052] In summary, the wind turbine black start control device based on a DC power supply proposed in this embodiment solves the initial excitation problem of the wind turbine generator set during black start, and can stably realize the black start of the wind turbine.

[0053] 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.

[0054] 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.

[0055] 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 control device based on a DC power supply, characterized in that: The device comprises: a DC power supply module, a rectifier, a first inverter and a grid-side filter component; The input end of the DC power module is connected to the fan, and the output end of the DC power module is connected to the input end of the rectifier; The output end of the rectifier is connected to the input end of the first inverter, and the output end of the first 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; Wherein, the DC power supply module is used to provide electric energy to the wind turbine during a black start, so as to realize a black start of the wind turbine.

2. The device according to claim 1, characterized in that The device further comprises: a capacitor; The capacitor is connected in parallel between the rectifier and the first inverter; The capacitor is used to filter out the ripples of the voltage and current output by the rectifier.

3. The device according to claim 2, characterized in that The DC power supply module includes: a DC power supply, a DC power supply switching switch, a resistance element, and a second inverter; The DC power supply switching switch, the DC power supply, and the resistance element are connected in series in sequence; The DC power supply switching switch is connected to the DC end of the second inverter, and the resistance element is connected to the DC end of the second inverter; The AC end of the second inverter is connected to the fan and the input end of the rectifier.

4. The device according to claim 3, characterized in that The resistance value of the resistance element is R; Among them, R ≥ U dc i cm , where U dc is the voltage value of the DC power supply output, i cm It is the upper limit of the inrush current.

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