Fault detection method and device for rotary rectifier in multi-phase brushless excitation system

Abstract

The invention discloses a multi-phase brushless excitation system rotation rectifier fault detection method and device. The method comprises the following steps: S1) obtaining actual dimension of an electric generator and an exciter, and establishing a finite element model of the main generator and an exciter model according to the actual dimension of the electric generator and the exciter; S2) establishing a rotation rectifier model according to the actual connection relationship of the rotation rectifier; S3) verifying accuracy of the main generator model, the exciter model and the rotation rectifier model; and S4) carrying out fault detection on the rotation rectifier by utilizing the established model. The beneficial effects are that electromagnetic transient simulation of a large-scale nuclear power unit excitation system can be realized; electrical quantity characteristic during fault is analyzed, and electrical quantity change law of the generator excitation system during fault is reappeared to realize fault detection of the rotation rectifier; and the multi-phase brushless excitation system rotation rectifier fault detection method and device are low in cost and high in efficiency.

Description

technical field [0001] The invention relates to the field of excitation systems of power plants, and more specifically relates to a fault detection method and device for a rotary rectifier of a multi-phase brushless excitation system. Background technique [0002] see figure 1 It is a schematic diagram of the structure of the multi-phase brushless excitation system. The AC exciter armature, rotating rectifier, and generator rotor of the multi-phase brushless excitation system rotate synchronously, and are relatively stationary with each other, which avoids the complicated and frequent operation and maintenance caused by the use of sliding contact elements such as carbon brushes and collector rings in the static excitation system. Problems that cause production accidents. [0003] However, since the rectifier diodes in the rotating rectifier of the multi-phase brushless excitation system are in a high-speed rotation state, damage to the rectifier diodes often occurs in actu...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a fault detection method and device for a rotary rectifier in a multi-phase brushless excitation system in view of the above-mentioned defects in the prior art that cannot realize the fault detection of the rotary rectifier

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