含DG配网电流幅值差异化保护方案

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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.

Key words： Distribution system with DG current amplitude restraint characteristic distribution system protection

Received: 26 November 2013 Published: 20 October 2015

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TM773

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	Xu Sixuan
	Lu Yuping

Cite this article:

Xu Sixuan,Lu Yuping. Current Amplitude Differential Protection for Distribution System with DG[J]. Transactions of China Electrotechnical Society, 2015, 30(18): 164-140.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2015/V30/I18/164

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