附加励磁阻尼控制器在某大型火电机组的可行性应用研究  

Feasibility application of additional excitation damping control device in a large thermal power unit

作　　者：王建军[1] WANG Jianjun(Shanxi Deyuan Fugu Energy Co.,Ltd.,Fugu 719000 Shanxi,China)

机构地区：[1]陕西德源府谷能源有限公司,陕西府谷719000

出　　处：《电力大数据》2021年第4期78-85,共8页Power Systems and Big Data

摘　　要：特高压直流输电和交流串补输电可能给临近电厂发电机组带来次同步谐振风险,严重的次同步谐振问题会导致发电机组轴系损坏,影响到机组和电网的安全稳定运行。本文以西北某600MW火电机组为研究对象,通过对该电厂次同步谐振风险分析研究,采用频率扫描法和时域仿真法仿真分析后得出该火电机组存在次同步谐振风险的结论。对比现有常用的次同步谐振抑制措施,分析附加励磁阻尼控制装置(SEDC)的特点,将加装SEDC装置作为该电厂机组抑制措施之一。对比分析电厂一期机组在SEDC装置投入和退出时模态阻尼系数的衰减情况、串补投入时SEDC装置投入和退出时机组的模态响应情况,结果表明,配置参数适当时,SEDC装置可以提高机组模态阻尼,能有效抑制小扰动引发的机组SSR振荡扰动。Ultra-high voltage DC back to back and AC series compensated transmission may bring the risk of subsynchronous resonance to nearby power plant electric generator,and serious subsynchronous resonance problems may lead to electric generator shafting damage,it affects the safe and stable operation of the generating unit and the power grid.In this paper,a 600MW thermal power unit in northwest China is taken as the research object,by using frequency scanning method and time domain simulation method,it is.concluded that the sub-synchronous resonance risk exists in the thermal power unit.The characteristics of the additional excitation damping control device(SEDC)are analyzed by comparing with the existing subsynchronous resonance suppression measures.The modal damping coefficient attenuation and modal response of the SEDC unit at the start-up and the end-up of the SEDC unit at the start-up and the end-up of the SEDC unit at the start-up of the series compensator are compared and analyzed,the SEDC unit can improve the modal damping of the unit and restrain the SSR oscillation caused by small disturbance effectively.

关 键 词：次同步谐振 频率 抑制 模态 阻尼 

分 类 号：TM62[电气工程—电力系统及自动化]