Wind power generation system based on open winding structure and fault tolerance control method thereof

Abstract

The invention discloses a wind power generation system based on an open winding structure. The wind power generation system comprises a wind power generator, two machine-side converters and a controller, wherein the wind power generator comprises three phases of windings, and each machine-side converter is of a three-phase six-bridge arm structure; and one end of any one phase of the winding of the wind power generator is connected with a center-to-center connection point of an upper bridge arm and a lower bridge arm of the corresponding phase in the first machine-side converter, and the other end is connected with the center-to-center connection point of the upper bridge arm and the lower bridge arm of the corresponding phase in the second machine-side converter. The wind power generation system disclosed by the invention utilizes the open winding power generator structure and two groups of two-level converters to realize the modulation effect of controlling three levels by a motor, the harmonic wave of output current is reduced, and the capacity of the converters and the voltage stress of devices are reduced. Simultaneously, the invention further discloses a fault tolerance control method of the wind power generation system, which can ensure that the system can normally and stably run when the converter devices have faults.

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 structure and a fault-tolerant 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 an...

AI Technical Summary

Problems solved by technology

But for the existing multilevel converters, including NPC, flying capacitor and other structures, they have common shortcomings: the structure is too complex, the cost is too high, and the control is difficult; and if the system is running, a certain The switching element is suddenly damaged, and the original control method is difficult to maintain its normal operation

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