Control system and control method of module-separated wind power generator

Abstract

The invention discloses a control system and a control method of a module-separated wind power generator. The system and the method solve the problems of construction difficulty, multi-module stator coordination control and redundancy control caused by integrated development, transport and assembling of a stator in a wind power generation system by taking a module-separated permanent-magnet synchronous generator as a controlled object and performing tracking control on maximum power of the permanent-magnet synchronous generator at different wind speeds. For rotating speed and position estimation of the module-separated permanent-magnet motor generator, zero-sequence carrier voltage detection speed sensorless systems are adopted and distributed coordination controllers are designed, so that coordination control of multiple modules is realized, the cost is saved, and the reliability of the system and the estimate accuracy are improved; a generator side adopts a voltage PWM (Pulse Width Modulation) rectification circuit, so that a power factor of a motor side is improved, and harmonic interference is reduced; and a power grid side adopts an H-bridge five-level inversion circuit, so that the quality of electric energy is improved, interference of an unstable factor of wind power generation with a power grid is reduced, and active power and reactive power control is realized.

Description

[0001] technical background [0002] The invention belongs to the technical field of power electronics and electric transmission, and in particular relates to a module-separated wind power generator control system and method. Background technique [0003] The current global ecological environment is deteriorating, and the development and utilization of new energy in various countries is also increasing. Wind power generation system occupies a very important position in the energy generation system. At present, wind power generation systems all adopt a single-branch back-to-back structure, which has many problems. The main aspects are as follows: The stator of the generator adopts the method of overall development, transportation and assembly, coupled with environmental factors such as strong winds, resulting in a series of problems such as construction difficulties; once the stator fails, the whole motor and its control system will be paralyzed, power supply Reliability is...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention proposes a module-separated wind power generator control system and control method to solve the problem of difficult construction caused by the overall development, transportation and assembly of the stator in the wind power generation system, and to solve the multi-unit stator coordination problem. Control and redundant control problems, solve the problems of small output power, low density and poor power adjustability in wind power generation systems, solve the problems of large input current harmonic components and low power factor of machine-side converters in wind power generation systems, and solve In the wind power generation system, the output voltage of the load side or the grid side has high harmonic content, and the output voltage waveform is not sinusoidal enough to solve the problem of low system reliability and high cost

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