中国电机工程学报Issue(5)：1023-1031,9.DOI:10.13334/j.0258-8013.pcsee.2015.05.002
多端口背靠背式直流-直流换流系统
Multiport Back-to-back dc-dc Converting Systems
摘要
Abstract
This paper proposed a multiport back-to-back dc-dc converting system (MB2B). The multiport consists of multiple voltage source converters (VSC), and an independent inner ac circuit, which is used to interconnect the ac side of multiple VSC converters. In order to enable multiport MB2B interconnecting multiple dc lines with different dc voltages, transformers are used for voltage matching of different voltage levels. Each port of the MB2B could control its power flow independently. In order to reduce the power loss of the VSC converters, the inner ac circuit is operated at the grid frequency. Controllers of each VSC converter and automatic power rebalance control of the grid were designed in this paper. A laboratory-scale four-terminal dc grid constructed by a four-port MB2B is used to test the necessity, feasibility and security of the multi MB2B. Simulations of the start-up process, power flow control, dc fault isolation and automatic power rebalance validated the feasibility and advantages of the MB2B. All of the controllers in the dc grid are achieved without requiring any telecommunication.关键词
直流电网/直流传输/直流-直流换流器/高压直流输电换流器/高压直流输电传输/功率平衡/风能Key words
dc grid/dc transmission/dc-dc conversion/HVDC converters/HVDC transmission/power rebalance/wind power分类
信息技术与安全科学引用本文复制引用
苗璐,林卫星,姚良忠,孙蔚,劲宇..多端口背靠背式直流-直流换流系统[J].中国电机工程学报,2015,(5):1023-1031,9.基金项目
国家电网公司专项(国家电网科研2013-304号)；国家自然科学基金项目(51261130484)。State Grid Corporation of China (State Grid Research 2013-304) （国家电网科研2013-304号）
Project Supported by National Natural Science Foundation of China (51261130484) （51261130484）
