A method for detecting loss-of-excitation faults of permanent magnet synchronous generators

Abstract

The invention provides a method for detecting the loss-of-excitation fault of a permanent magnet synchronous generator. The method comprises the following steps: S1, determining whether a generator loses excitation according to a first output power of the generator at a first time and a second output power of the generator at a second time; S2, if the generator loses excitation, determining the loss-of-excitation type of the generator according to the sampling value of one phase of voltage at the generator end of the generator in a third period of time; and S3, determining the loss-of-excitation degree indicator of the generator according to the loss-of-excitation type of the generator. According to the method provided by the invention, the loss of excitation of the generator can be detected and the loss-of-excitation degree can be evaluated through measurement of conventional data and simple mathematical calculation, and the operation for detecting the loss of excitation of the generator is more convenient and quicker. The method not only can determine whether a generator loses excitation, but also can accurately obtain the degree of loss of excitation of the generator. The methodis of great significance to fault diagnosis and maintenance of generators.

Description

technical field [0001] The invention relates to the field of fault diagnosis, and more specifically, to a method for detecting a loss-of-excitation fault of a permanent magnet synchronous generator. Background technique [0002] In recent years, under the background of the global energy crisis and increasingly serious environmental pollution, the development of renewable energy has begun to receive widespread attention from the society. Wind energy, as a clean and renewable energy, is more and more developed and promoted by countries all over the world because of its own characteristics such as green environmental protection, large content and low cost. The permanent magnet synchronous motor, because of its permanent magnet structure, is more suitable for the multi-pole low-speed structure required in the wind power generation environment compared with the electric excitation structure motor, and it saves the brush and slip ring, which improves the power generation efficienc...

AI Technical Summary

Problems solved by technology

Although method 3 can realize the on-line monitoring of permanent magnet synchronous motor demagnetization fault, it is also affected by the observation accuracy of permanent magnet flux linkage

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