Abstract：A new current amplitude differential protection criterion for distribution system with DG is proposed in this paper. Fault current amplitude characteristic at each side of fault feeder is firstly analyzed. Under the condition of prescribed DG capacity penetration and the restriction on output current amplitude, the amplitudes of fault currents are obviously different at each end of fault feeder. Based on this conclusion, there is an action-brake characteristic equation in this new method to ensure fault sensitivity and protection reliability. Even though performing like traditional differential protection, the new method requires only current amplitude parameter, while dispensing with phasor comparison, which makes it easier to be realized in distribution system with DG having low communication automatization level. Simulation tests that the method is rational and effective.
许轩, 陆于平. 含DG配网电流幅值差异化保护方案[J]. 电工技术学报, 2015, 30(18): 164-140.
Xu Sixuan, Lu Yuping. Current Amplitude Differential Protection for Distribution System with DG. Transactions of China Electrotechnical Society, 2015, 30(18): 164-140.
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