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| Converter and DC side fault characteristics and protection scheme of the unified power flow controller based on modular multilevel converter |
| DOI：10.7667/PSPC171439 |
| Key Words:modular multilevel converter unified power flow controller fault characteristics protection scheme differential protection |
| Author Name | Affiliation | | QI Huanhuan | State Key Laboratory of Advanced Power Transmission Technology, Global Energy Interconnection Research Institute, Beijing 102209, China | | LU Zhengang | State Key Laboratory of Advanced Power Transmission Technology, Global Energy Interconnection Research Institute, Beijing 102209, China | | CHEN Jing | Electric Power Research Institute, State Grid Jiangsu Electric Power Company, Nanjing 211102, China | | LI Peng | Electric Power Research Institute, State Grid Jiangsu Electric Power Company, Nanjing 211102, China | | LI Houyuan | State Key Laboratory of New Energy Power System North China Electric Power University, Beijing 102206, China | | ZHENG Tao | State Key Laboratory of New Energy Power System North China Electric Power University, Beijing 102206, China |
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| Abstract:The Unified Power Flow Controller (UPFC) is one of the Flexible AC Transmission System (FACTS) devices used in transmission line for real-time control and dynamic compensation. The converter and DC side have complicated fault characteristics, the effect of fault is an inevitable issue. This paper first introduces the basic structure and operating principle of MMC-UPFC, next analyzes fault characteristics of several typical converter side and DC side fault. According to the analysis, the protection scheme for MMC-UPFC converter and DC side is proposed. Moreover, aiming at the problem that conventional differential protection for converter arm single-phase-to-ground fault and DC side single-pole-to-ground fault cannot meet the requirement of reliability, an improved protection scheme is proposed. Simulation results based on Real-Time Digital Simulator (RTDS) verify the proposed protection scheme. This work is supported by Science and Technology Project of State Grid Jiangsu Electric Power Company (No. J2017041). |
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