Method and device for detecting diode open-circuit fault of multiphase brushless exciter

Abstract

The invention relates to a diode open-circuit fault detection method and device for a multiphase brushless exciter, and the method comprises the steps: carrying out the real-time sampling of the excitation current of a stator excitation winding, and carrying out the filtering processing of the sampling data; dividing the filtered sampling data in one electric period into a plurality of groups according to equal group distances, counting the quantity of the sampling data in each group, and performing kernel function curve fitting according to the quantity of the sampling data in each group to obtain a fitting curve; and judging whether a one-phase open-circuit fault of the diode occurs or not according to the fitting curve. According to the technical scheme, the online detection method is simple, effective and high in accuracy, power generation safety of the unit is guaranteed, and operation reliability of the unit is improved.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a method and device for detecting a diode open-circuit fault of a multi-phase brushless exciter. Background technique [0002] The excitation system is an important part of a large generator. An excitation system with excellent performance and high reliability is the basis for ensuring the safety of the generator and the stable operation of the power system. Compared with static excitation, the brushless excitation system eliminates the carbon brushes and slip rings of the generator, which significantly improves the reliability of the excitation system and is the preferred excitation method for large-capacity nuclear power units. The multi-phase brushless excitation system can not only reduce the requirement of high-power excitation system on the capacity of a single diode, but also improve the quality of rectified voltage and improve the fault tolerance of the system. [0003] In t...

AI Technical Summary

Problems solved by technology

In the initial stage of the open circuit fault, the exciter can still provide normal current to the main generator, but if the fault is allowed to continue to deteriorate, it will seriously affect the normal operation of the main generator and cause serious consequences

[0004] For the fault of the rotating rectifier, the brushless excitation system currently operating on site generally adopts the standard DNC (Diode Non-conduction Detection System) system for monitoring when the rotating rectifier leaves the factory. longer units)

Images