Research Of Fault Location Method For HVDC Transmission Line Based On FastICA

High voltage direct current transmission lines has gradually assume responsibility for long-distance transmission. Because of the transmission line is long, the fault line and fault elimination artificial is time-consuming and can not ensure the reliability of power supply.Therefore, the rapid and accurate to determine the location of line fault is very important.Because of the method of traveling wave fault location is not affected by the operation mode of system and fault resistance and other factors, which are widely used in many places.In this paper the analysis method of fast independent component to be used to analyze the traveling wave on HVDC transmission line and research on a new method for measuring.According to the structure of high voltage direct current transmission system to analyze the generation reasons of fault transient traveling wave and its transmission characteristics.The fault traveling wave signal has the characteristics of non-Gauss and mutation, and it is composed of multiple independent signals mixed stacking. On the basis of the Characteristic of the fault traveling wave signal on HVDC transmission line to analyze the the separation characteristics of the transient fault signal, and it is based on the method of independent component analysis about the negative entropy(FastICA algorithm) and dynamic FastICA algorithm of kurtosis. Kurtosis dynamic Fast ICA algorithm can separate the transient current signal accurately and reliably. In addition, it can also be used for the separation of HVDC transmission line traveling wave fault.The fault location method of single channel can solve the ranging error caused by multi-input signal and improve the ranging accuracy. Therefore, we can constructed the dynamic location algorithm based on single channel FastICA, which can isolate the current traveling wave signal from the fault current signal, and can exactly detect the arrives moment that the wave-head of initial traveling wave and the second wave-head line from the fault line,and then we can determine the polarity between the two wave head. According to the locationprinciple of single ended traveling wave fault, we can complete the measurement fault distance.To build a high voltage direct current transmission line simulation model by using PSCAD and Matlab/Simulink software, we simulated the distance measurement of different fault locations and different transition resistance. The simulation results show that the dynamic FastICA algorithm based on single channel high voltage direct current transmission line fault distance measurement is accurate and reliable.