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SANG Zixia,ZHENG Xu,YAN Jiong,WANG Sicong,DU Zhi,ZHOU Sixuan.Research on Redundancy Design for Fault-tolerant Control of Solid-state Transformer Based on Cascaded Multi-level Converter[J].JOURNAL OF POWER SUPPLY,2019,17(5):31-38
Research on Redundancy Design for Fault-tolerant Control of Solid-state Transformer Based on Cascaded Multi-level Converter
Received:December 24, 2018  Revised:May 27, 2019
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DOI:10.13234/j.issn.2095-2805.2019.5.31
Keywords:active distribution network  integrated energy system  solid-state transformer  cascaded multi-level converter  redundancy  fault-tolerant strategy
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SANG Zixia Economic & Technology Research Institute, State Grid Hubei Electric Power Co., Ltd, Wuhan , China
ZHENG Xu Economic & Technology Research Institute, State Grid Hubei Electric Power Co., Ltd, Wuhan , China 20688068@qq.com
YAN Jiong Economic & Technology Research Institute, State Grid Hubei Electric Power Co., Ltd, Wuhan , China
WANG Sicong Economic & Technology Research Institute, State Grid Hubei Electric Power Co., Ltd, Wuhan , China
DU Zhi Economic & Technology Research Institute, State Grid Hubei Electric Power Co., Ltd, Wuhan , China
ZHOU Sixuan Economic & Technology Research Institute, State Grid Hubei Electric Power Co., Ltd, Wuhan , China
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Abstract:
      The reliability of an integrated energy interconnected system applying a solid-state transformer(SST) is hi-ghly related to that of the cascaded multi-level converter which forms the same SST. With the introduction of redundant converter modules, the SST can withstand component failures, thus improving the reliability of the SST and the associated power grid. Based on an SST which can be applied in the integrated energy system and active distribution network(ADN), a fault-tolerant control strategy is proposed based on redundant sub-modules. After a comparative study on several fault-tolerant strategies for redundancy arrangement and the corresponding operation principles, a single-phase 9-lelve SST consisting of cascaded multi-level converter modules is modeled in the Saber simulation platform, and the proposed fault-tolerant control method for redundant sub-modules is simulated. Simulation results verify that the proposed strategy can reduce the customer's power interrupt time and the consequent damages to the SST device.
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