摘要
无刷励磁发电机通常采用单端注入式原理构成转子一点接地保护,针对该保护无法计算接地故障位置的问题,提出采用自动举刷方式改变转子绕组的引出方式(由固定负端引出变更为正负两端均引出),进而采用双端注入直流电压的乒乓武原理构成转子一点接地保护。给出了改进的乒乓式接地保护原理、接地电阻计算方法和保护动作判据,并采用Matlab/Simulink软件构建转子一点接地故障仿真模型。仿真试验结果表明,改进的乒乓式转子特地保护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 problem of rotor one point earthing protection based on single-terminal current voltage injection type used in brushless excitation generator, this paper proposes method for changing the terminal lead of generator rotor by brush lifting device and using the principle of advanced ping-pong type to build one-point ground protection. This paper analyzes the principle of advanced ping-pong type rotor ground fault protection, a calculating method for grounding resistance and the criterion of the protection, and also establishes the simulation model of the rotor one point earthing protection based on Matlab/Simulink software. The simulation result shows that the proposed scheme can satisfy the precision and sensitivity requirement of the brushless excitation generator.
出处
《陕西电力》
2012年第8期66-69,73,共5页
Shanxi Electric Power
关键词
无刷励磁
一点接地保护
举刷装置
励磁电压
仿真
brushless excitation
one-point ground protection
brush lifting device
excitation voltage
simulation
