Fault Phase Selection of Large-Scale Wind Farms Based on Transient Voltage Waveform Integral

The traditional phase selection methods have adaptability problems for large-scale wind farms. Therefore, a phase selection method based on transient voltage waveform integral for large-scale wind farms is proposed. According to the characteristics of fault component for three-phase transient voltage, the three-phase transient voltage after a fault is collected and fault component is calculated. The three-phase voltage waveform in short-time window is integrated and a criterion is constructed by relationship between integral ratio, so as to identify the fault phase. The threshold does not need to be set and the algorithm is simple to calculate in the method. Finally, the simulation results show that the fault phase can be identified accurately and quickly by the proposed methods. In particular, the fault phase can be also accurately identified with the remote high resistance fault. The comparisons with the traditional methods show the superiority of the proposed method.