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

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...

AI Technical Summary

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 this half-controlled structure, the control of the phase current of the motor is limited to half a cycle, although this structure can reduce the The number of controllable devices, but the current harmonic content it brings is also very rich, which affects the control effect of the wind turbine

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