应用附加励磁阻尼控制抑制HVDC引起的次同步振荡  

Application of supplementary excitation damping control for suppression of subsynchronous oscillation caused by HVDC

作　　者：张远取[1] 谢小荣[1] 姜齐荣[1] 

机构地区：[1]清华大学电机系,电力系统国家重点实验室,北京100084

出　　处：《电力系统保护与控制》2010年第4期1-5,共5页Power System Protection and Control

基　　金：电力系统国家重点实验室项目(SKLD08M02);国家重点基础研究发展计划(973项目)(2004CB217906);国家电网公司科技项目资助(20090857)

摘　　要：大型汽轮发电机组经交直流混合送出的系统中,当高压直流输电(HVDC)控制与机组之间相互作用较强时,可能引发机组轴系的次同步振荡(SSO)问题。对此,研究了附加励磁阻尼控制(SEDC)抑制HVDC-SSO的有效性。在PSCAD/EMTDC仿真平台构建了典型的交直流混合输电系统模型,研究了HVDC引起SSO的系统运行条件,进而设计了多模式SEDC控制器,分别在大/小扰动下分析了SEDC改善模式阻尼和暂态响应的效果。结果表明:SEDC能大幅提高机组轴系多个模式的阻尼,在大/小扰动下均能有效抑制SSO,避免出现SSO发散风险,保障机组和电网的安全稳定运行。SEDC可望成为解决HVDC-SSO问题的有效方法之一。Subsynchronous oscillation （SSO） tends to appear between HVDC control systems and closely coupled turbine-generator shafts in transmission systems involving large turbine-generators and HVDC links. This paper explores the effectiveness of using supplementary excitation damping control, or SEDC, for damping such kind of SSO. A typical AC＆DC hybrid transmission system model is firstly modeled in PSCAD/EMTDC. Then various operational conditions are investigated to study the characteristics of HVDC-SSO problem. Further, a multi-modal SEDC is developed and its improvement on modal damping and transient dynamics has been analyzed in both small and large disturbances. The results show that SEDC can greatly enhance the damping of the torsional modes concerned and thus effectively depress SSO under small and large disturbances, insuring safe and stable operation of the generator and the system. Therefore, SEDC promises to be one effective solution for HVDC-SSO problem.

关 键 词：高压直流输电 次同步振荡 附加励磁阻尼控制 模式阻尼 

分 类 号：TM712[电气工程—电力系统及自动化]