摘要
为改善高压直流输电(HVDC)系统故障下的动态恢复特性,运用PSCAD/EMTDC仿真工具,研究了HVDC系统逆变站分别采用固定电容器(FC)、静止无功补偿器(SVC)、静止同步补偿器(STATCOM)3种无功补偿设备时的故障恢复特性,其中故障有直流闭锁、换流母线三相接地、单相接地、远端三相接地等。结果表明,交流系统较弱时,SVC会降低交流系统强度,而导致HVDC系统故障及故障恢复时发生连续换相失败,而STATCOM在电压保持、功率恢复等方面都较其他补偿设备有着明显的优点,能够显著改善HVDC系统的动态特性。
The fault recovery of High Voltage Direct Current （ HVDC） transmission system is often influenced by many factors, such as the strength of inverter AC system, the reactive power compensation characteristics of the inverter and the dynamic performance of DC controllers, especially when the strength of inverter AC system is too weak, the HVDC often experiences continuous commutation failure during and after fault, which makes the recovery of DC power much difficult, even fall to recovery from the fault. In that case, the reactive power compensating performanee of the device applied in the inverter becomes much more important. In this paper, the PSCAD/EMTDC simulation tool is used to study the dynamic recovery performance of HVDC system for several different var compensating devices in HVDC inverter- Fixed capacitor （FC）, Static Var compensator （SVC）, Static synchronous compensator （ STATCOM） when HVDC is subject to various faults, including DC block, three phase grounding, single phase grounding and remote three phase grounding fault. The result shows that when AC system is weak, SVC can lower the AC strength, so leads to the continuous commutation failure and slow down the HVDC recovery process, and the STATCOM can improve HVDC recovery performance greatly for its advantages over other compensating devices in areas such as voltage support ability and DC power recovery.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2006年第9期11-14,共4页
High Voltage Engineering
基金
上海市科技启明星项目(05QMX1432)
上海市重点学科建设项目(P1301)
上海市科委重大科技攻关项目(041612012)
关键词
高压直流
短路比
故障恢复
无功补偿
动态特性
HVDC
short-circuit ratio （SCR）
fault recovery
reactive power compensation
dynamic characteristics
