新型直流输电系统故障恢复特性  

Recovery Characteristics of New-type HVDC Connected to AC System with Weak Strength

作　　者：李季[1] 罗隆福[1] 许加柱[1] 李勇[1] 张杰[1] 刘福生[1] 

机构地区：[1]湖南大学电气与信息工程学院,长沙410082

出　　处：《高电压技术》2007年第10期137-141,共5页High Voltage Engineering

摘　　要：为了解不同无功补偿方式对交流系统强度的不同影响度,提出了一种自耦补偿与谐波屏蔽的新型换流变压器,其结构特点在于换流变压器阀侧角接三角形绕组端部引出抽头接辅助滤波兼无功补偿装置,有效的将谐波抑制于阀侧并部分的补偿换流器所消耗的无功功率,在此基础上建立了一种新型的直流输电系统。对新系统和目前广泛使用的无功补偿设备在HVDC故障恢复过程中作用的仿真分析结果表明,新型换流变压器能够增强交流系统,故障切除后HVDC可以较快的恢复,提高了输电系统运行的安全稳定性。The recovery speed of HVDC system is strongly influenced by the strength of AC power system to which the HVDC is connect, however, the influences of different reactive power compensators on the strength of AC power system are not the same. This paper proposed a novel self-coupled compensated and suppressing harmonic converter transformer （SCCSHCT）. The windings in the valve side adopt prolonged delta connection to provide the circuit for three-multiple harmonic currents, and the corner delta windings are connected with the filtering and reactiveload compensation equipments in the valve side. The harmonic current are suppressed effectively and some reactive power could be compensated in the valve side. A new DC transmission system using the new-type converter transformer is correspondingly established. The impacts of the new system and widely used reactive power compensating device on the recovery process of HVDC are simulated and analyzed. The research results show that the new-type converter transformer strengthens the AC power system and better recovery characteristics of HVDC system can be obtained after the fault being cleared, the stability and security of the power transmission system could be enhanced.

关 键 词：高压直流输电 换流变压器 自耦补偿 谐波屏蔽 故障恢复 稳定性 

分 类 号：TM721.1[电气工程—电力系统及自动化]