Current traveling wave based protection scheme for microgrids using morphological gradient algorithm
DOI:10.7667/PSPC180089
Key Words:microgrids  morphological gradient algorithm  current traveling wave based protection  fault line selection  fault phase selection
Author NameAffiliation
XUE Shimin Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China 
CUI Miao Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China 
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Abstract:In consideration of the fault characteristics and protection requirements of microgrids, this paper proposes a current traveling wave based protection scheme using morphological gradient algorithm that can select fault lines and phases. Firstly, compared with discrete wavelet transform algorithm and morphological gradient algorithm, it is found that morphological gradient algorithm can extract traveling wave signals more clearly. Secondly, a fault line selection scheme is designed, which applies to various network topologies of microgirds. Thirdly, a fault type identification and fault phase selection scheme based on three-phase initial current traveling waves and their modal components is proposed. Finally, the dead zone problem of travelling wave protection is analyzed and the corresponding solution is proposed. The PSCAD/EMTDC and Matlab software are used in the simulation analysis, and correctness and feasibility of the protection scheme is verified by simulation results. This work is supported by National Natural Science Foundation of China (No. 51577129), National High-tech R & D Program of China (863 Program) (No. 2015AA050102), and Science and Technology Project of State Grid Corporation of China “Research on Relay Protection Technology for Distribution Network Adaptable to High Permeability Distributed Power Supply”.
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