Fault Control of Inverter Interfaced Distributed Generator Considering Fault Direction Identification of the Grid-Connected Microgrid
Zhu Jiran1, Mu Longhua1, Guo Wenming2
1. College of Electronics and Information Engineering Tongji University Shanghai 201804 China; 2. College of Electronic Communication and Electrical Engineering Changsha University Changsha 410022 China
Abstract：The microgrid fault current is bidirectional, and a key issue of its protection is how to determine the fault direction. The analysis of positive-sequence additional network of microgrid shows that the applicability of the positive-sequence fault component (PFSC) based directional element in gird-connected microgrid is decided by the quadrant of the PSFC impedance angle of inverter interfaced distributed generator (IIDG). However, due to the diversity of IIDG power output strategy and the uncertainty of voltage variation at the IIDG coupling point, the quadrant of PSFC impedance angle of IIDG cannot be determined. In this regard, this paper proposed a multi-stage IIDG fault control method. By manipulating the fault response characteristic of IIDG in a specific time window, the PSFC impedance angle was controlled to a given value, so as to construct a PSFC feature independent of IIDG power output strategy in microgrid. The Simulink simulation results verified the accuracy of the microgrid fault direction identification by adopting the proposed IIDG fault control method.
朱吉然, 牟龙华, 郭文明. 考虑并网运行微电网故障方向识别的逆变型分布式电源故障控制[J]. 电工技术学报, 2022, 37(3): 634-644.
Zhu Jiran, Mu Longhua, Guo Wenming. Fault Control of Inverter Interfaced Distributed Generator Considering Fault Direction Identification of the Grid-Connected Microgrid. Transactions of China Electrotechnical Society, 2022, 37(3): 634-644.
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2022, Vol. 37 
