相近扭振频率并联发电机组次同步振荡研究  

Research on Subsynchronous Oscillation of Parallel Connected Generators With Close Torsional Frequencies

作　　者：张鹏 毕天姝 杨奇逊 贺静波 

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206 [2]国家电力调度控制中心,北京市西城区100031

出　　处：《中国电机工程学报》2015年第20期5181-5187,共7页Proceedings of the CSEE

基　　金：国家863高技术基金项目(2012AA050208);高等学校学科创新引智计划项目("111"项目)(B08013);中央高校基本科研业务费专项资金资助(2015MS09)~~

摘　　要：大型火力发电厂通常采用分期建设的方式,使得同一电厂中可能存在轴系扭振频率接近的并联发电机组。该文针对相近扭振频率并联发电机组次同步振荡的机理、特性和风险开展研究。首先采用特征值方法分析了相近扭振频率并联机组次同步振荡的机网振荡模式和机组间振荡模式的形成机理和特点,并对发生于实际系统中的次同步振荡现象给出了清晰、合理的解释。在此基础上,分析了串补度和开机组合方式对两种振荡模式的影响,从而揭示了相近扭振频率并联机组次同步振荡的风险规律。最后,采用数字仿真方法对分析结论进行了验证。Parallel-connected no-identical machines with close torsional frequencies as large power plants are usually built in phases. In this paper, the mechanism, characteristic and risks of subsynchronous oscillation （SSO） of parallel connected generators with close torsional frequencies were studied. Firstly, the mechanism and characteristics of Gen-Grid Mode and Gen-Gen Mode were revealed based on eigenvalue analysis. Furthermore, the SSO phenomenon in an actual system was explained reasonably and clearly. On this basis, the effects of compensation level and array mode of generators on the two modes were investigated, and the risk law of parallel-connected generators with close torsional frequencies was revealed. Digital simulation was conducted to verify the analysis conclusions.

关 键 词：次同步振荡 相近扭振频率 并联发电机组 机网振荡模式 机组间振荡模式 

分 类 号：TM711[电气工程—电力系统及自动化]