±1100kV特高压直流换流阀能量泄放过程及相关影响因素  

Energy Release Process in ±1100kV UHVDC Converter Valve and Related Influencing Factors

作　　者：司马文霞[1] 王荣[1] 杨庆[1] 袁涛[1] 杨鸣[1] 邹密[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030

出　　处：《南方电网技术》2015年第1期25-32,共8页Southern Power System Technology

摘　　要：换流阀是实现高压直流输电的核心设备,在闭锁检修过程中换流阀残留能量泄放时间直接影响着故障后恢复供电时间长短,对电网运行可靠性具有重要意义。根据换流站的实际结构,搭建单极直流输电系统EMTDC/PSCAD仿真模型,对换流阀中各关键元件的电场和磁场能量泄放过程进行了研究,并对换流站残余能量主要的影响因素进行分析。研究结果表明:晶闸管吸收电容储存的电场能是换流阀闭锁后阀厅残余能量主要来源,该部分能量衰减时间大于7s,主要泄放通道为直流出线接地开关和换流变阀侧接地开关;仅采用4把接地开关同样能够在3s内将换流阀电压降低至36V以下,这为下一步换流站接地开关配置方式的研究提供了技术支撑。Converter valve is the domain machine installed in the UHVDC transmission system. The discharge time of the residual en- ergy of the value while it is closed for maintenance is important for the quick recovery of the transmission system, and influences the reliability of the electrical system significantly. The EMTDC/PSCAD simulation models of the electric machines and the mono-pole UHVDC transmission system based on the converter station structure are presented. In order to verify the regular pattern of the energy releasing process in the electric device, detailed analysis is further carried out on the releasing process of electric field energy and magnetic field energy of the key components in the valve, and the main factors affecting the residual energy are pointed out. The results show that the residual energy in the converter station mainly comes from the electric field energy stored in the thyristor snubber capacitor which takes more than 7 s to decay through discharge channels include grounding switches located on DC lines and converter transformer valve side. By using only 4 switches, the the valve voltage can be lowered down to 36 V in 3 s, which provides technical support for future research on grounding switch configuration in converter station.

关 键 词：特高压直流输电 换流阀 仿真模型 能量泄放 吸收电容 接地开关 

分 类 号：TM721[电气工程—电力系统及自动化]