电网技术2016，Vol.40Issue(1)：55-63,9.DOI:10.13335/j.1000-3673.pst.2016.01.008
适用于远距离大容量架空线路的LCC-MMC串联混合型直流输电系统
A LCC and MMC Series Hybrid HVDC Topology Suitable for Bulk Power Overhead Line Transmission
摘要
Abstract
In this paper,a hybrid HVDC topology with line commutated converter (LCC) and modular multilevel converter (MMC) in series connection is proposed,suitable for bulk power overhead line transmission.This topology is flexible in operation in terms of active and reactive power control,and able to withstand ac and dc faults with cooperative control of LCC and MMC.First,operation principle and mathematical model are presented.Then,strategies coping with ac faults at rectifier and inverter side are discussed respectively,preventing current cut-off under ac fault at rectifier side and maintaining part of active power if LCC commutation failure occurs under ac fault at inverter side.Feasibility dealing with dc fault is theoretically demonstrated by analyzing characteristic of MMC under block state.A detailed control strategy for dc fault is further proposed combined with a test system.Finally,effectiveness of the control strategy for ac and dc faults is verified with time-domain simulation with the test system.关键词
电网换相换流器/模块化多电平换流器/混合直流输电系统/直流故障清除/架空线路/大容量输电Key words
line commutated converter/modular multilevel converter/hybrid topology/dc fault clearance/overhead line/bulk power transmission分类
信息技术与安全科学引用本文复制引用
徐政,王世佳,李宁璨,肖晃庆,江伟..适用于远距离大容量架空线路的LCC-MMC串联混合型直流输电系统[J].电网技术,2016,40(1):55-63,9.基金项目
国家电网公司科技项目(SGCC-HRP031-2015).Project Supported by Science and Technology Foundation of State Grid Corporation of China (SGCC-HRP031-2015). （SGCC-HRP031-2015）
