改进的叠加直流电压式转子接地保护在无刷励磁发电机中的运用

Improved Principle of DC Voltage Injection Type Rotor Ground Fault Protection for Brushless Exciting Generator

针对无刷励磁发电机转子接地保护问题,提出将叠加直流电压式与切换采样式相结合的接地保护方案。给出了改进的叠加直流电压式转子一点接地保护原理、接地电阻计算方法和保护动作判据,并采用Matlab/Simulink软件构建转子绕组一点接地故障仿真模型。仿真试验结果表明,该原理能够满足无刷励磁发电机实际运行需要的精度和灵敏度。

In view of the rotor ground fault protection for brushless exciting generator, this paper advances combi- ning the principle of direct current voltage injection type with ping-pong type to build one-point ground protection. This paper analyzes the improved principle of direct current voltage injection type rotor ground fault protection and what the emulation experiment based on Matlab/Simulink software manifest is that the scheme can satisfy the needs of preciseness and delicacy for brushless exciting generator.