Abstract
In order to make full use of renewable energy, a large number of distributed generations (DGs) are directly connected to the distribution system, so that the fault current in the feeders of the distribution network is bi-directional. Most DGs in the distribution network are inverter-interfaced DGs (IIDGs), and their control strategies and fault characteristics are quite different from traditional power sources. Therefore, from the perspective of relay protection, the distribution network with IIDG cannot be simply equivalent to a double-ended source system. This paper analyzes the applicability of self-synchronization technology in distribution networks with IIDGs and proposes novel differential protection based on this technology. The proposed method can adaptively adjust the restraint current according to the amplitude of the fault current output by IIDG and has a certain ability to tolerate time synchronization error. Finally, PSCAD/EMTDC simulation is used to verify the correctness of the theoretical analysis and the effectiveness of the proposed method.
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