Doubly-fed induction generator fault detection method based on sliding mode observer

Abstract

In order to carry out fault detection on the doubly-fed induction generator, the invention provides a doubly-fed induction generator fault detection method based on a sliding mode observer. Because asliding mode observer is simple in structure, is not liable to be affected by parameters, is high in anti-interference capability, and the like, the sliding mode observer is used for the fault detection of the doubly-fed induction generator. Firstly, a sliding mode observer is built according to a mathematical model of the doubly-fed induction generator, the rotor current and the rotating speed ofthe doubly-fed induction generator are observed, and self-detection of faults is achieved by comparing the residual error between the actual rotor current value and the observed value, then three faults of a power grid end voltage drop fault, a doubly-fed induction generator stator turn-to-turn fault and a rotor current sensor fault are given so as to prove that the sliding-mode observer can wellperform fault detection on faults occurring at different positions, and the sliding-mode observer has the characteristics of the high response speed, the good stability and the like.

Description

technical field

[0001] The invention relates to a double-fed induction motor fault detection method based on a sliding mode observer, which belongs to the field of electric control. Background technique

[0002] As a new form of power generation, wind power has been connected to the power grid on a large scale, which has changed the stable operation characteristics of the traditional power system dominated by synchronous generators. With the vigorous development of wind power generation, the total installed capacity of wind power has grown rapidly, and the capacity of single units has continued to increase. The proportion of installed wind power generation in the total installed capacity of the power system has continued to increase, especially in some areas with abundant wind energy resources and concentrated wind power installed capacity. , wind power generation has occupied an important position in the local power system, and has become an important power injection node o...

Images