Novel principle of phase selection for wind power integration based on fault transient voltage in time-domain

Traditional phase selectors are inapplicable in wind power integration because the fault characteristics of wind power system are quite different from those in regular grids. A novel phase selector in time domain for wind power integration based on phase voltage transient characteristics is proposed. Through theoretical analysis, it is found out that the correlations between phase voltage transient characteristics for different fault types are quite different. And phase selection criteria based on correlation coefficient are constructed accordingly. The novel principle of phase selection adopts voltage waveforms, thus not affected by week in-feed characteristic of wind power system. In addition, the principle adopts transient voltages in time domain, thus immune to the unstable impedance of wind power system. PSCAD simulations and the field fault records of wind power integration verify the effectiveness of the novel phase selection principle.