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Control method for output current and output power of wind driven generator and corresponding control device

A technology for wind turbines and output current, which is applied to control generators, control generators through magnetic field changes, control systems, etc., and can solve problems such as low product reliability, complex hardware circuits, and a large number of sampling data.

Active Publication Date: 2020-07-03
HEFEI WIN POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the shortcomings of the prior art above, the purpose of this application is to provide a method for controlling the output current and output power of a wind turbine and a corresponding control device, which are used to solve the problem of sampling in the process of controlling the output current and output power of existing small wind turbines. A lot of data, complex hardware circuits, high equipment manufacturing costs and low product reliability

Method used

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  • Control method for output current and output power of wind driven generator and corresponding control device
  • Control method for output current and output power of wind driven generator and corresponding control device
  • Control method for output current and output power of wind driven generator and corresponding control device

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Experimental program
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Effect test

Embodiment 1

[0060] see Figure 4 , is the topology structure of the wind power generation system given in this application. The wind power generation system at least includes a wind power generator, a three-phase bridge half-controlled rectifier circuit, a bus capacitor and a load. Specifically, the three-phase bridge half-controlled rectifier circuit includes three diodes D 8 、D 9 、D 10 and three power switches V 2 , V 3 , V 4 , three diodes D 8 、D 9 、D 10 Form the upper half bridge of the rectifier, three power switch tubes V 2 , V 3 , V 4 within the respective parasitic diode D 11 、D 12 、D 13 Form the rectifier half bridge, three diodes D 8 、D 9 、D 10 The positive poles of the three power switch tubes V 2 , V 3 , V 4 connected to the drain of the wind turbine, and at the same time respectively connected to the three-phase output terminals U, V, W of the wind turbine, and the three power switch tubes V 2 , V 3 , V 4 The sources are connected to the bus capacitor C ...

Embodiment 2

[0072] Based on the same inventive idea, for the wind power generator output current control method described in Embodiment 1, this application also discloses a corresponding wind power generator output current control device, please refer to Figure 8 , using the topology of the wind power generation system in Embodiment 1, the output current control device at least includes an acquisition module 1 and an execution module 2 .

[0073] The acquisition module 1 is used to obtain the output current of the three-phase bridge-type half-controlled rectifier circuit; the execution module 2 is used to obtain the output current of the three-phase bridge-type half-controlled rectifier circuit obtained by the acquisition module 1 and the preset current-limiting control algorithm. The generator output current is controlled.

[0074] Specifically, the acquiring module 1 is used to acquire the output current of the three-phase bridge semi-controlled rectifier circuit when the power switch ...

Embodiment 3

[0079] Please refer to Figure 9-Figure 11 , based on the same inventive concept, the present application also provides a wind power generator output power control method, using the same topological structure of the wind power generation system as in Embodiment 1 and Embodiment 2.

[0080] Figure 9 It is a flow chart of wind power generator output power control, and the control method includes:

[0081] S01. Obtain the output current and output voltage of the three-phase bridge half-controlled rectifier circuit;

[0082] S02. Control the output power of the wind power generator according to the obtained output current and output voltage of the three-phase bridge half-controlled rectifier circuit and a preset first power control algorithm.

[0083] Please refer to Figure 10 , in step S02, specifically including steps S021-S024:

[0084] S021. Calculate the output line voltage of the wind power generator.

[0085] Preferably, according to the formula Calculate the outpu...

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Abstract

The invention provides a control method for the output current and output power of a wind driven generator and a corresponding control device. A three-phase output end of the wind driven generator isconnected with a three-phase bridge type half-control rectifying circuit, and the on and off state of a power switch tube in the three-phase bridge type half-control rectifying circuit are controlledby PWM signals. The control method of the output current of the wind driven generator comprises the following steps: acquiring the output current of the three-phase bridge type half-control rectifyingcircuit; and controlling the output current of the wind driven generator according to the obtained output current of the three-phase bridge type half-control rectifier circuit and a preset current-limiting control algorithm. According to the method for controlling the output current of the wind driven generator, the output current of the wind driven generator can be effectively controlled throughthe current-limiting algorithm only by acquiring the output current of the three-phase bridge type half-control rectifying circuit, and the situation that the wind driven generator and the three-phase bridge type half-control rectifying circuit are damaged due to the fact that the output current of the wind driven generator is too high is avoided. According to the invention, a hardware circuit issimplified, equipment manufacturing cost is reduced, and product reliability is improved.

Description

technical field [0001] The invention belongs to the field of new energy power generation and electrical technology, and in particular relates to a method for controlling output current of a wind power generator and a control device thereof, and a method for controlling output power of a wind power generator and a device thereof. Background technique [0002] The machine-side converter of the wind power generation system is used to convert the alternating current output by the wind turbine into direct current. The circuit topology of the machine-side converter can be divided into three-phase bridge uncontrolled rectification circuit, three-phase bridge half Controlled rectification circuit and three-phase bridge fully controlled rectification circuit. [0003] Wind turbines need to control their output current during operation to prevent overcurrent damage to wind turbines and components in the circuit. like figure 1 As shown, for the wind power generation system where the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P9/00H02P9/30H02P101/15
CPCH02P9/008H02P9/30H02P2101/15
Inventor 张为民周一晨
Owner HEFEI WIN POWER