Judgment method of key sensor fault of double-fed wind generating set

Abstract

The invention provides a judgment method of a key sensor fault of a double-fed wind generating set, which realizes effective judgment of the key sensor fault by utilizing observer models, a fault detection unit and a disturbance filer unit. The judgment method comprises the following steps: constructing the observer model of stator current and rotor current and the observer model of stator voltage starting from an electromagnetic transient model of a double-fed generator; constructing the fault detection unit by an adaptive threshold method through analysis on the possible soft and hard faulttypes of the sensor; When the fault residual error is greater than an adaptive threshold value, constructing the disturbance filer unit by design of a timing unit; and finally completing design of the judgment models of the sensor fault based on the adaptive threshold value. The judgment method adopts an algorithm for constructing corresponding observers so as to improve the adaptability and the accuracy of the observer algorithm on fault judgment; and by combination of the adaptive threshold value and the disturbance filer unit, the false alarm rate of the sensor fault is reduced and the robustness of fault judgment is improved.

Description

technical field [0001] The invention relates to a method for judging failures of key sensors of a doubly-fed wind turbine, specifically including a method for judging failures of stator voltage sensors and stator and rotor current sensors, and belongs to the technical field of wind power generation. Background technique [0002] With the increasing single-unit capacity of grid-connected wind turbines in my country, and the planning, construction and operation of large-scale wind farms, especially offshore wind farms, how to improve and ensure the operational reliability of wind turbines has become an important issue in domestic and foreign engineering and academic circles. focus of world attention. Doubly-fed wind turbine is a mainstream model used in wind power generation. The three-phase winding of the stator of the doubly-fed generator is connected to the power frequency grid, and the rotor winding and a four-quadrant inverter with adjustable amplitude, frequency, phase an...

AI Technical Summary

Problems solved by technology

Once the key sensors that affect the function of the control system fail, such as voltage and current sensors, it may directly lead to the unstable operation of the existing control system, and then directly affect the reliability and safety of the wind turbine operation. The failure of the key sensor of the wind-fed generator set has important practical significance for improving the reliability and safety of the unit operation

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