Control device for photovoltaic participation in black start operation of fan

Abstract

The invention provides a control device for photovoltaic participation in fan black-start operation. The control device comprises a rectifier, a photovoltaic black-start power supply, an inverter and a network side filtering assembly. The input end of the rectifier is connected with a fan, and the output end of the rectifier is connected with the input end of the photovoltaic black-start power supply; the output end of the photovoltaic black-start power supply is connected with the input end of the inverter, and the output end of the 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; the photovoltaic black-start power supply comprises a photovoltaic power generation unit. According to the technical scheme, the problem of initial excitation of the wind generating set during black start is solved through the external photovoltaic power generation unit, meanwhile, effective utilization of new energy is achieved, and cost is saved.

Description

Technical Field

[0001] The present application relates to the technical field of wind turbine black start, and in particular to a control device for photovoltaic-involved wind turbine black start operation. 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 control device for photovoltaic-participated black-start operation of a wind turbine, so as to at least solve the technical problem that the existing black-start does not solve the initial excitation of the wind turbine generator set during the black-start.

[0004] The first aspect of the present application provides a control device for photovoltaic participation in wind turbine black start operation, the control device comprising: a rectifier, a photovoltaic black start power supply, an inverter and a grid-side filter component;

[0005] The input end of the rectifier is connected to the wind turbine, and the output end of the rectifier is connected to the input end of the photovoltaic black start power supply;

[0006] The output end of the photovoltaic black start 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;

[0007] The output end of the grid-side filter component is connected to the input end of the grid;

[0008] Wherein, the photovoltaic black start power supply includes: a photovoltaic power generation unit.

[0009] Preferably, the photovoltaic black start power supply further comprises: a photovoltaic power generation unit switching switch and a capacitor;

[0010] One end of the photovoltaic power generation unit switching switch is connected to the positive wire between the rectifier and the inverter, the other end of the photovoltaic power generation unit switching switch is connected to one end of the photovoltaic power generation unit, and the other end of the photovoltaic power generation unit is connected to the negative wire between the rectifier and the inverter;

[0011] 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.

[0012] Further, the photovoltaic black start power supply further comprises: a resistance element;

[0013] The resistor element is connected in series with the photovoltaic power generation unit, one end of the resistor element is connected to the photovoltaic power generation unit, and the other end of the resistor element is connected to the negative pole wire between the rectifier and the inverter.

[0014] Further, the resistance value of the resistance element is R;

[0015] Among them, R ≥ U dc / i cm , where U dc is the voltage value output by the photovoltaic power generation unit, i cm It is the upper limit of the inrush current.

[0016] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0017] The present application proposes a control device for photovoltaic-participated black start operation of a wind turbine, the control device comprising: a rectifier, a photovoltaic black start power supply, an inverter and a grid-side filter component; the input end of the rectifier is connected to the wind turbine, the output end of the rectifier is connected to the input end of the photovoltaic black start power supply; the output end of the photovoltaic black start power supply is connected to the input end of the inverter, 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 power grid; wherein the photovoltaic black start power supply comprises: a photovoltaic power generation unit. The technical solution proposed in the present application solves the initial excitation problem of the wind turbine generator set during black start by connecting an external photovoltaic power generation unit, and at the same time realizes the effective use of new energy and saves costs.

[0018] 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

[0019] 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:

[0020] Figure 1 A block diagram of a control device for photovoltaic participation in wind turbine black start operation according to an embodiment of the present application;

[0021] Figure 2 A first structural diagram of a photovoltaic control device for participating in wind turbine black start operation connected to a wind turbine and a power grid according to an embodiment of the present application;

[0022] Figure 3A second structural diagram of a photovoltaic control device for participating in wind turbine black start operation connected to a wind turbine and a power grid according to an embodiment of the present application;

[0023] Reference numerals

[0024] Rectifier 1, photovoltaic black start power supply 2, inverter 3, grid-side filter component 4, wind turbine 101, power grid 106, photovoltaic power generation unit 2-1, photovoltaic power generation unit switching switch 2-2, capacitor 2-3, and resistor element 2-4. DETAILED DESCRIPTION

[0025] 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.

[0026] The present application proposes a photovoltaic-participated control device for wind turbine black start operation, the control device comprises: a rectifier, a photovoltaic black start power supply, an inverter and a grid-side filter component; the input end of the rectifier is connected to the wind turbine, the output end of the rectifier is connected to the input end of the photovoltaic black start power supply; the output end of the photovoltaic black start power supply is connected to the input end of the inverter, 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 power grid; wherein the photovoltaic black start power supply comprises: a photovoltaic power generation unit. The technical solution proposed in the present application solves the initial excitation problem of the wind turbine generator set during black start by connecting an external photovoltaic power generation unit, and at the same time realizes the effective use of new energy and saves costs.

[0027] A control device for photovoltaic-assisted wind turbine black start operation according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0028] Embodiment 1

[0029] Figure 1 A structure of a control device for photovoltaic participation in wind turbine black start operation is provided according to an embodiment of the present application, such as Figure 1 As shown, the control device includes: a rectifier 1, a photovoltaic black start power supply 2, an inverter 3 and a grid-side filter component 4;

[0030] The input end of the rectifier 1 is connected to the fan 101, and the output end of the rectifier 1 is connected to the input end of the photovoltaic black start power supply 2;

[0031] The output end of the photovoltaic black start power supply 2 is connected to the input end of the inverter 3, and the output end of the inverter 3 is connected to the input end of the grid-side filter component 4;

[0032] The output end of the grid-side filter assembly 4 is connected to the input end of the grid 106;

[0033] Wherein, the photovoltaic black start power supply 2 includes: a photovoltaic power generation unit 2-1.

[0034] It should be noted that if Figure 1 The photovoltaic-participated control device for wind turbine black start operation shown is only used as an illustration and does not limit the structure of the photovoltaic-participated control device for wind turbine black start operation of the present application.

[0035] In the embodiments of the present disclosure, Figure 2 As shown, the photovoltaic black start power supply 2 also includes: a photovoltaic power generation unit switching switch 2-2 and a capacitor 2-3;

[0036] One end of the photovoltaic power generation unit switching switch 2-2 is connected to the positive wire between the rectifier 1 and the inverter 3, and the other end of the photovoltaic power generation unit switching switch 2-2 is connected to one end of the photovoltaic power generation unit 2-1, and the other end of the photovoltaic power generation unit 2-1 is connected to the negative wire between the rectifier 1 and the inverter 3;

[0037] One end of the capacitor 4 is connected to the positive wire between the rectifier 1 and the inverter 3 , and the other end is connected to the negative wire between the rectifier 1 and the inverter 3 .

[0038] In the embodiments of the present disclosure, Figure 3 As shown, the photovoltaic black start power supply 2 further includes: a resistance element 2-4;

[0039] The resistor element 2 - 4 is connected in series with the photovoltaic power generation unit 2 - 1 , one end of the resistor element 2 - 4 is connected to the photovoltaic power generation unit 2 - 4 , and the other end is connected to the negative pole wire between the rectifier 1 and the inverter 3 .

[0040] In the figure, R is a resistor element 2-4 provided to prevent the photovoltaic power generation unit 2-1 from causing an impact current when switched on.

[0041] It should be noted that the resistance value of the resistor element is R;

[0042] Where R ≥ U dc / i cm , where U dc is the voltage value output by the photovoltaic power generation unit, i cm It is the upper limit of the inrush current.

[0043] For example, taking the black start of a doubly-fed asynchronous wind turbine generator set as an example, when the black start process begins, the switch S1 in the photovoltaic black start power supply 2, that is, the photovoltaic power generation unit switching switch 2-2, is closed, and the photovoltaic black start power supply 2 then starts to provide the initial excitation voltage to the doubly-fed asynchronous wind turbine generator in the wind turbine 101 through the rectifier 1 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 photovoltaic power generation unit switching switch 2-2 is disconnected, and the doubly-fed asynchronous wind turbine generator can operate independently and cope with the impact caused by the load input. Finally, a low-voltage microgrid is gradually formed in combination with photovoltaic power generation to supply power to auxiliary machines such as the yaw system of the remaining units in the wind farm, ensuring 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.

[0044] The control device for photovoltaic participation in wind turbine black start operation proposed in this application has the following advantages:

[0045] 1. By connecting an external photovoltaic power generation unit to the wind power converter, the initial excitation problem of the wind turbine generator set during black start is solved, and the electricity cost during black start is saved;

[0046] 2. By initially exciting the wind turbine to establish a stable voltage and frequency, the photovoltaic power generation unit can be cut off after the system runs independently to complete the black start of the wind turbine.

[0047] In summary, the photovoltaic-participated control device for wind turbine black start operation proposed in this embodiment solves the initial excitation problem of the wind turbine generator set during black start by externally connecting a photovoltaic power generation unit, while achieving effective utilization of new energy and saving costs.

[0048] 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.

[0049] 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.

[0050] 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 the field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A control device for photovoltaic participation in wind turbine black start operation, characterized in that: The control device comprises: a rectifier, a photovoltaic black start power supply, an inverter and a grid-side filter component; The input end of the rectifier is connected to the wind turbine, and the output end of the rectifier is connected to the input end of the photovoltaic black start power supply; The output end of the photovoltaic black start 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; Wherein, the photovoltaic black start power supply includes: a photovoltaic power generation unit.

2. The control device according to claim 1, characterized in that The photovoltaic black start power supply also includes: a photovoltaic power generation unit switching switch and a capacitor; One end of the photovoltaic power generation unit switching switch is connected to the positive wire between the rectifier and the inverter, the other end of the photovoltaic power generation unit switching switch is connected to one end of the photovoltaic power generation unit, and the other end of the photovoltaic power generation unit 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.

3. The control device according to claim 2, characterized in that The photovoltaic black start power supply further includes: a resistance element; The resistor element is connected in series with the photovoltaic power generation unit, one end of the resistor element is connected to the photovoltaic power generation unit, and the other end of the resistor element is connected to the negative pole wire between the rectifier and the inverter.

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

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