Simulation and Recognition for Rotary Rectifier Fault of Multi-Phase Brushless Excitation System
Hao Liangliang1, Wang Shanming1, Qiu Arui1, Liu Weiqun2, Wu Long2, Mu Wei2
1. State Key Laboratory of Control and Simulation of Power System and Generation Equipments, Department of Electrical Engineering Tsinghua University Beijing 100084 China 2. Nanjing Nari-Relays Electric Co., Ltd Nanjing 211102 China
Abstract：Damage of rotary rectifier in multi-phase brushless excitation system occurs frequently, which would seriously affect the normal safe operation of the main generator in deteriorating condition. In order to study fault recognition of the rotary rectifier, the multi-loop model of multi-phase brushless excitation system including the rectifier is established. The normal state and the common fault states of the rectifier are simulated, and the comparison between the calculated results and the experiments verify the validity of the model and simulation. The components with different frequencies of stator currents under different states of rotary rectifier as well as their mechanism are analyzed theoretically, based on which the ratio of the 4th to the 22nd harmonic component of the stator current is suggested to be the fault recognition object, which provides a theoretical basis for fault diagnosis of rotary rectifier in multi-phase brushless excitation system.
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2012, Vol. 27 
