摘要
针对多端柔性直流电网的故障保护和潮流控制问题,该文提出一种具备潮流控制功能的多端口混合式直流断路器,由通流支路、主断路器支路两部分构成。当系统正常稳态运行时,该断路器具有潮流控制功能,可用于调节支路潮流;系统发生故障后,相当于混合式直流断路器,用于切断故障电流。建立了具备潮流控制功能的多端口混合式直流断路器拓扑,阐述了稳态和暂态运行机理,并进行经济性分析。最后,在PSCAD仿真平台搭建了四端直流输电系统,验证了所提拓扑在潮流控制和故障切除方面具有良好的性能。
Aiming at the fault protection and power flow control problems of the multi-terminal flexible DC grid,this paper proposed a multi-port hybrid DC circuit breaker with power flow control function.The proposed breaker consists of two parts:the through-flow branch and the main breaker branch.When the system is in the steady state operation,it has a power flow control function,which can adjust the branch power flow;when the system fails,the structure is equivalent to a hybrid DC circuit breaker for cutting off the fault current.A multi-port hybrid DC circuit breaker topology with power flow control function was established;the steady-state and transient operation mechanism were elaborated;and the economic characteristicswere analyzed.Finally,a four-terminal DC transmission system was built on the PSCAD simulation platform to verify the proposed topology,which has good performance in power flow control and fault removal.
作者
史雪亚
王鹤
边竞
关佳欣
SHI Xueya;WANG He;BIAN Jing;GUAN Jiaxin(School of Electrical Engineering,Northeast Electric Power University,Jilin 132012,Jilin Province,China)
出处
《现代电力》
北大核心
2020年第6期598-604,共7页
Modern Electric Power
基金
国家自然科学基金项目(51677023)。
关键词
直流电网
潮流控制
故障保护
多端口
直流断路器
DC power grid
power flow control
fault protection
multi-port
DC breaker
