Renewable Microgrid Protection Strategy Coordinating with Current-based Fault Control

作     者：Zihao Wang Longhua Mu Chongkai Fang Zihao Wang;Longhua Mu;Chongkai Fang

作者机构：College of Electronics and Information EngineeringTongji UniversityShanghai 201804China 

出 版 物：《Journal of Modern Power Systems and Clean Energy》 (现代电力系统与清洁能源学报（英文）)

年 卷 期：2022年第10卷第6期

页      面：1679-1689页

核心收录：

学科分类：0711[理学-系统科学] 0808[工学-电气工程] 080802[工学-电力系统及其自动化] 08[工学] 0823[工学-交通运输工程] 

基　　金：supported by the Fundamental Research Funds for the Central Universities(No.22120210164). 

主　　题：Renewable microgrid protection strategy fault characteristic control strategy fault component 

摘      要：The renewable microgrid(RMG)is a critical way to organize and utilize new energy.Its control and protection strategies during the fault are the core technologies to ensure the safe operation and stability of the system.The traditional protection principles are unsuitable for RMGs due to the flexibility of RMG operation,the complexity of RMG topology,and the variety of fault control strategies of inverter-interfaced distributed generators(IIDGs).The traditional fault component protection principle is affected by the low voltage ride-through(LVRT)control strategy and will fail in some scenarios.In order to make the fault component protection principle available in every scenario,a current-based fault control strategy is proposed.Specific fault characteristics are generated by the grid-feeding IIDGs during the fault so they can be equivalent to the open circuits,and the fault models in additional network can be simplified.By analyzing the fault characteristics,an RMG protection strategy based on the current-based fault control of IIDGs is presented.The fault directions of feeders can be distinguished and the fault feeder can be located accurately in both grid-connected and islanded RMGs.Then,the grid-feeding IIDGs can transit to LVRT mode smoothly.Thus,IIDGs are considered comprehensively in terms of coordinating with fault control and fault characteristic generation.Finally,the experimental results of the hardware platform prove the effectiveness of the proposed current-based fault control strategy,and the simulation results based on PSCAD/EMTDC verify the correctness of the protection strategy.