模块化多电平中压直流变换器的高可靠自供电架构研究  

Research on the Architecture of Highly Reliable Self-powered System for Modular Multilevel Medium Voltage DC Converters

作　　者：李楚杉[1] 方恒 龚青苑 李成敏 李武华[3] 何湘宁[3] LI Chushan;FANG Heng;GONG Qingyuan;LI Chengmin;LI Wuhua;HE Xiangning(Zhejiang University-University of Illinois at Urbana-Champaign Institute,Haining 314400,Zhejiang Province,China;Polytechnic Institute,Zhejiang University,Hangzhou 310015,Zhejiang Province,China;College of Electrical Engineering,Zhejiang University,Hangzhou 310027,Zhejiang Province,China;École Polytechnique Fédérale de Lausanne(EPFL),Lausanne 1015,Switzerland)

机构地区：[1]浙江大学伊利诺伊大学厄巴纳香槟校区联合学院,浙江省海宁市314400 [2]浙江大学工程师学院,浙江省杭州市310015 [3]浙江大学电气工程学院,浙江省杭州市310027 [4]洛桑联邦理工学院,瑞士洛桑1015

出　　处：《中国电机工程学报》2024年第2期670-681,I0020,共13页Proceedings of the CSEE

基　　金：国家重点研发计划政府间国际科技创新合作重点专项(2022YFE0101900);浙江省自然科学基金项目(LZ22E070002)。

摘　　要：随着大容量中压直流配电技术的迅速发展,模块化多电平直流变换器受到工业界和学术界的广泛关注。然而,实现高可靠的辅助供电是实现直流变换器在中压直流配电场景中应用的关键技术瓶颈之一。为此,提出一种面向模块化多电平中压直流变换器的高可靠自供电系统架构。该架构实现主控制器、子模块等辅电系统的中压直联馈电,从而无需额外低压直流电源,并且大幅提升系统启动速度。基于此架构设计,模块化多电平直流变换器的子模块控制器和旁路开关辅助供电均实现3倍冗余,提高系统容错运行的能力。在子模块电容预充电阶段,提出一种基于辅助电源自主控制的子模块电容均压方法,保证模块化多电平直流变换器可靠预充电。最终通过实验验证所提辅助供电系统架构的可行性。Modular multi-level DC converters have received extensive attention from industry and academia with the rapid development of large-capacity medium-voltage DC power distribution technology.However,achieving highly reliable auxiliary power supply is one of the key technical bottlenecks to realize the application of DC converters in medium-voltage DC power distribution scenarios.To this end,this paper proposes a highly reliable self-powered system architecture for modular multi-level medium-voltage DC converters.The architecture realizes the medium-voltage direct power supply of the central controller and sub-modules,so that no additional low-voltage DC power supply is required,and the system startup speed is greatly improved.Based on this architecture design,the auxiliary power supply of the sub-module controller and the bypass switch for modular multi-level medium-voltage DC converters have achieved three times redundancy,which improves the fault-tolerant operation capability of the system.A voltage balancing method of sub-module capacitors based on the autonomous control of auxiliary power supply in the pre-charging stage is proposed,which ensures the reliable pre-charging of the modular multi-level DC converter.Finally,the feasibility of the proposed auxiliary power supply system architecture is verified by experiments.

关 键 词：模块化多电平直流变换器 自供电 中压直联馈电 子模块电容均压 

分 类 号：TM46[电气工程—电器]