架空线柔性直流电网构建方案  

Construction Scheme of Overhead Line Flexible HVDC Grid

作　　者：孙栩[1] 曹士冬 卜广全[1] 王华伟[1] 雷霄[1] 卢斌先[2] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192 [2]华北电力大学电气与电子工程学院,北京市昌平区102206

出　　处：《电网技术》2016年第3期678-682,共5页Power System Technology

摘　　要：国家电网为配合绿色奥运的理念,计划在北京、河北建设柔性直流电网。从拓扑结构、关键设备、控制保护等方面对架空线柔性直流电网构建方案进行了研究。直流电网网架结构采用口字型结构,换流站采用对称单极结构;关于子模块拓扑的选择,存在半桥子模块结合高压大电流直流断路器以及故障自清除子模块结合快速机械直流开关2种方法。半桥子模块方案技术简单成熟,但是需要超快速保护装置,而且有可能存在直流断路器不能全面保护换流站的问题,需要配置大量的换流器限流电抗器与直流线路限流电抗器;故障自清除子模块方案不需要超快速保护装置,然而存在直流线路故障后所有站短暂闭锁的问题,但是不会造成整个电网的失稳。关键设备和控制保护目前来看不存在不可逾越的难题。This paper researches construction scheme on overhead line flexible HVDC grid in aspects such as topology, key devices and control and protection. HVDC grid network is in square configuration and station network is in symmetrical monopole configuration. There are two choices for sub-module, i.e. half bridge topology combining HV heavy current DC breaker and fault self-clearance topology combining fast mechanical DC switch. Half bridge sub-module scheme is simple and mature, but needs super fast protective device. DC breakers may not protect all stations completely during faults and a large number of converter and line current-limiting reactors are needed. Fault self-clearance sub-module scheme don＇t need super fast protection device, but will cause short period block in all stations after DC line faults. At present, key devices and control and protection are not difficult problems for overhead line flexible HVDC grid.

关 键 词：架空线 柔性直流电网 构建方案 

分 类 号：TM712[电气工程—电力系统及自动化]