HVDC引发次同步振荡的复转矩系数法分析  

Complex Torque Coefficient Approach to Analyzing the HVDC-caused Subsynchronous Oscillation

作　　者：李佳琪 文俊[1] 于世游 刘河林 黄永宁 张汉花 韩民晓[1] LI Jiaqi;WEN Jun;YU Shiyou;LIU Helin;HUANG Yongning;ZHANG Hanhua;HAN Minxiao(School of Electrical and Electronic Engineering,North China Electric Power University,Beijing 102206,China;Electric Power Research Institute of State Grid Ningxia Electric Power Company,Yinchuan 750002,China)

机构地区：[1]华北电力大学电气与电子工程学院,北京102206 [2]国网宁夏电力有限公司电力科学研究院,宁夏银川750002

出　　处：《华北电力大学学报（自然科学版）》2019年第3期42-49,共8页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家重点研发计划智能电网技术与装备重点专项(国家重大科学工程建设项目计划)

摘　　要：次同步振荡是电力系统运行的不正常状态,发生后可能损坏汽轮发电机组转子,危害电网运行。我国直流工程附近电厂已多次发生次同步振荡,因此高压直流输电引起次同步振荡的问题亟待解决。以高压直流输电引发次同步振荡的机理分析为基础,利用复转矩系数法,对含高压直流输电的系统建立数学模型进行理论分析。然后基于PSCAD/EMTDC搭建含高压直流输电的系统仿真模型,应用复转矩系数法对算例系统进行理论计算与仿真结果综合分析,验证复转矩系数法对于高压直流输电引起次同步振荡研究的有效性。最后,通过复转矩系数法,分析与高压直流输电相连的送端电网强度对系统次同步振荡的影响。As a kind of abnormal phenomenon in power system,subsynchronous oscillation(SSO)may interpret system operation by its potential damage to the rotor of turbine generators.There have been several subsynchronous oscillations in the power stations along the transmission line of the HVDC projects of China.Therefore,the problem of subsynchronous oscillations caused by HVDC is urged to be solved.Based on the mechanism of subsynchronous oscillation,a mathematical model of the system containing HVDC was built and analyzed in the method of complex torque coefficient.To verify the effect of complex torque coefficient on HVDC-caused SSO,this paper established a simulation model of the HVDC system based on PSCAD/EMTDC and applied complex torque coefficient in theoretically calculating the example system and comprehensively analyzing simulations.At last,this paper studied the effect of the parameters of the AC system connected to the HVDC on SSO by complex torque coefficient.

关 键 词：次同步振荡 高压直流输电 复转矩系数法 电磁转矩 阻尼系数 

分 类 号：TM74[电气工程—电力系统及自动化]