Fault Characteristics and Diagnosis Strategy Analysis of Power Switch Failures on Solid State Transformer in Integrated Energy System
Sang Zixia1, Zheng Xu1, Fang Rengcun2, Yang Dongjun1, Du Zhi2
1. State Grid Hubei Economic Research Institute Wuhan 430077 China; 2. State Grid Laboratory for Hydro-Thermal Power Resources Optimal Allocation & Simulation Technology Wuhan 430077 China;
Abstract：As the integrated energy system can realize the integrated energy management for active distribution network, its reliability is highly related to the widely applied solid state transformer (SST) which are based on cascaded H-bridge converters. This paper presents research on the voltage and current distortion in the high voltage stage, isolation stage and low voltage stage of SST after the open-circuit and short-circuit faults of its power switches. The operational principles and the control methods for high voltage stage, isolation stage and low voltage stage of SST are introduced. Based on conclusions derived from the performance analysis of SST after the faults, this paper comes up with the effects from its topology design and control scheme on the current and voltage distortion. According to the SST fault characteristics, the abnormality of relevant components heavily depend on the location of the faulty switch, hence it is possible to locate the position of the faulty switch. Finally, the fault characteristics peculiar to SST are analyzed, and further discussed with simulation on the Saber platform, as well as a fault location diagnosis algorithm.
桑子夏, 郑旭, 方仍存, 杨东俊, 杜治. 基于综合能源系统的固态变压器中开关器件故障特性分析与诊断[J]. 电工技术学报, 2021, 36(zk1): 231-240.
Sang Zixia, Zheng Xu, Fang Rengcun, Yang Dongjun, Du Zhi. Fault Characteristics and Diagnosis Strategy Analysis of Power Switch Failures on Solid State Transformer in Integrated Energy System. Transactions of China Electrotechnical Society, 2021, 36(zk1): 231-240.
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2021, Vol. 36 
