基于信号注入法的风火打捆经直流外送系统次同步扭振分析  

Analysis of sub-synchronous torsional mode of wind-thermal bundled system transmitted via HVDC based on a signal injection method

作　　者：王俊茜 贾祺 刘侃[1] 王健[1] 杨慧彪 翟文超 WANG Junxi;JIA Qi;LIU Kan;WANG Jian;YANG Huibiao;ZHAI Wenchao(Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology,Ministry of Education(Northeast Electric Power University),Jilin 132012,China;State Grid Liaoning Electric Power Research Institute,Shenyang 110006,China;State Grid Ningxia Electric Power Research Institute,Yinchuan 750002,China)

机构地区：[1]现代电力系统仿真控制与绿色电能新技术教育部重点实验室(东北电力大学),吉林吉林132012 [2]国网辽宁电力科学研究院,辽宁沈阳110006 [3]国网宁夏电力科学研究院,宁夏银川750002

出　　处：《电力系统保护与控制》2021年第17期109-120,共12页Power System Protection and Control

基　　金：国家自然科学基金委员会-国家电网公司智能电网联合基金项目资助(U1866601)。

摘　　要：随着大规模新能源的发展,风火打捆经高压直流外送是解决风电消纳问题的关键手段。与此同时,风电机群、直流输电与同步发电机组之间的次同步振荡问题日益凸显。针对双馈风电机群、直流输电与同步发电机组的动态交互问题,建立了线性化模型,研究风电机群、直流输电的动态过程对同步发电机组机电暂态过程的影响。基于附加励磁信号注入法,分析直流输送容量固定时双馈风电机群控制参数、运行风速、并网台数等因素对同步发电机组各扭振模式阻尼特性的影响规律,辨识同步发电机组轴系负阻尼扭振机理。基于时域仿真模型,验证了所提方法能够有效揭示双馈风电机群对同步发电机组轴系扭振的影响。With the development of large-scale renewable energy,the wind-thermal bundled system transmitted via High Voltage Direct Current(HVDC)has become a key method to solve the problem of wind power consumption.At the same time,the problem of subsynchronous oscillation among wind turbines,HVDC,and the Synchronous Generator(SG)has become increasingly serious.Considering the dynamic interactions among Doubly-Fed Induction Generator(DFIG)-based wind turbines,HVDC and SG,a linearization model is established.The influence of the dynamic processes of wind turbines and HVDC on the electromechanical transient processes of SG is studied.Based on the method of additional excitation signal injection,when the capacity of HVDC is fixed,the influence of DFIG-based wind turbine main factors including control parameters,wind speeds,and numbers of grid connected units on the damping characteristics of the SG torsional mode is analyzed.The mechanism of the negative damping torsional mode of the SG is identified.Based on a time-domain simulation model,the effectiveness of the proposed method in revealing the influence of DFIG-based wind turbines on the shaft torsion of SG is verified.

关 键 词：双馈异步发电机 同步发电机组 高压直流输电 机电耦合 轴系扭振 

分 类 号：TM61[电气工程—电力系统及自动化]