Wind power generation system on basis of open winding derating structure and control method thereof

A technology of a wind power generation system and a control method, which is applied in wind power generation, parallel feeding arrangement of a single network, etc., can solve the problem of affecting the control effect of wind turbines, the large harmonic content of phase currents of wind turbines, and increasing the topology of the control system. The size of the structure and other issues can achieve the effect of good motor operation, small current harmonic content, and reduction of voltage stress.

Active Publication Date: 2013-05-01
ZHEJIANG UNIV
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Problems solved by technology

On the one hand, this structure will increase the volume of the control system topology, and on the other hand, it will also bring a large harmonic content to the phase current of the wind turbine.
Another proposed solution is to use a half-controlled converter to control the motor; however, for

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  • Wind power generation system on basis of open winding derating structure and control method thereof
  • Wind power generation system on basis of open winding derating structure and control method thereof
  • Wind power generation system on basis of open winding derating structure and control method thereof

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Embodiment Construction

[0039] In order to describe the present invention more specifically, the wind power generation system and its control method of the present invention will be described in detail below in conjunction with the drawings and specific embodiments.

[0040] Such as figure 2 As shown, a wind power generation system based on an open-winding derating structure includes: a wind power generator, two machine-side converters, two grid-side converters and a controller;

[0041] The wind power generator includes a wind wheel and a permanent magnet generator. The permanent magnet generator has three-phase windings. The wind wheel drives the rotor of the permanent magnet generator to rotate, thereby converting wind energy into electrical energy.

[0042] Both the generator-side converter and the grid-side converter have a three-phase six-leg structure, each bridge arm of the generator-side converter J1 is composed of a diode, and each bridge arm of the generator-side converter J2 and the grid...

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Abstract

The invention discloses a wind power generation system on the basis of an open winding derating structure, which comprises a wind driven generator, two machine side converters and a controller. The machine side converters are of a three-phase six-bridge-arm structure, wherein each bridge arm of the machine side converter J1 is formed by connecting at least one uncontrolled device in series; each bridge arm of the machine side converter J2 is formed by connecting at least one full-control device in series; and one end of any one phase of winding of the wind driven generator is connected with central contacts of the upper and lower bridge arms of a corresponding phase in the machine side converter J1 and the other end of the phase of winding of the wind driven generator is connected with central contacts of the upper and lower bridge arms of a corresponding phase in the machine side converter J2. According to the invention, by utilizing an open winding generator structure and the small-capacity full-control converter, control on an open winding permanent magnet motor is implemented, capacity of the converters and voltage stress of the devices are reduced and cost of the system is reduced. The invention also discloses a control method of the wind power generation system.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a wind power generation system based on an open-winding derating structure and a control method thereof. Background technique [0002] As a clean and renewable energy, wind energy has been highly valued by countries all over the world in recent years. The reserves of wind energy are huge. With the development and utilization of wind energy, the global wind power generation has maintained rapid and continuous growth for many years. The permanent magnet direct drive wind turbine has the advantages of high reliability, simple structure, low maintenance cost, and strong grid connection adaptability, and is especially suitable for high-power offshore wind turbines. [0003] The structure of the traditional permanent magnet synchronous wind power system is as follows: figure 1 As shown, it is mainly composed of wind turbines, machine-side converters and grid...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCY02E10/763Y02E10/76
Inventor 周义杰年珩
Owner ZHEJIANG UNIV
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