Fault location method for interpole fault of DC distribution line based on active detection principle
To overcome the influence of the auxiliary effect on the end terminal and to realize the accurate fault lo-cation of DC distribution line,a fault location method based on active detection principle is proposed.After the fault occurs,a current limiting strategy is designed to limit the fault current,and then switched to the active detec-tion control strategy to inject the characteristic frequency detection signal to the DC line.According to the excitation and response characteristics of the fault equivalent circuit under the characteristic frequency,a fault location equa-tion is constructed,and the single-terminal fault location based on fault analysis method is realized.The corre-sponding model is built in the PSCAD simulation software,and the performance of the fault location method under different fault areas and fault transition resistances is verified by simulations.The method of using the characteristic frequency detection signal to construct the fault location equation to overcome the influence of the auxiliary effect on the end terminal is verified,and the relative error of the fault location results is within 0.5%.
DC distribution power systemfault locationauxiliary effectactive detectionfault location based on fault analysis method
万方数据
维普
