电工技术学报2018，Vol.33Issue(4)：817-825,9.DOI:10.19595/j.cnki.1000-6753.tces.161130
适用于中高压直流电网的开关电容接入式直流变压器
DC Transformer Based on Switched Capacitor in High and Medium Voltage DC Power System
摘要
Abstract
A scheme of dc transformer based on switched capacitor applied in high and medium DC power system was presented and analyzed in this paper. When the DC voltage ratio of primary and secondary voltage sides fails to match the voltage ratio of transformer, the voltage matching of high frequency link can be achieved by adding a short circuit conduction process of the primary full bridge, thereby improving the current stress of the switches and the efficiency of the system. The proposed scheme can also be functioned as a DC circuit breaker. It can remove a DC-side short circuit fault and resume operation very quickly once the fault disappears, which improves the reliability of the system. Redundancy operation can also be realized when internal sub-module fault occurs, further improving the reliability of the system. In this paper, the characteristics of voltage and current, conduction behavior, control and fault dealing strategies, and parameters design were analyzed. The correctness and practicability of the proposed scheme were verified by the physical prototype experiment.关键词
中高压直流电网系统/直流变压器/开关电容/电压匹配/冗余运行/直流开关Key words
High and medium DC power system/DC transformer/switched capacitor/voltage match/redundancy operation/DC circuit breaker分类
信息技术与安全科学引用本文复制引用
李建国,赵彪,宋强,刘文华..适用于中高压直流电网的开关电容接入式直流变压器[J].电工技术学报,2018,33(4):817-825,9.基金项目
国家高技术研究发展计划(863计划)资助项目(2013AA050104). （863计划）
