微网的分层协同保护

Hierarchical Coordinative Protection of Microgrid

基于实际逆变器限流特性提出了逆变器控制方案,并在该基础上进行微网建模。微网保护设计主要考虑的是微网自身特点以及微网对配电网保护产生的影响。通过获取故障电流方向锁定故障区域,克服了微网自身特点带来的问题。采用分层协调方案解决了微网对配电网带来的影响。通过PSCAD进行算例仿真分析,验证了文中建模和控制方案的正确性和有效性。

Based on current limiting characteristics of actual inverter an inverter control scheme is proposed, on this basis the modeling of microgrid is performed. In the design of microgrid protection, the characteristics of microgrid its own and the impacts of microgrid protection on protection of distribution network are mainly considered. The faulty region is locked in by obtaining fault current, thus the troubles brought by the characteristics of microgrid its own can be overcome. A hierarchical coordinative is adopted to cope with the impacts of microgrid on distribution network. Simulation analysis on Benchmark 0.4kV low voltage microgrid is performed by PSCAD, thus both correctness and effectiveness of the proposed model and control schemes are verified.