基于短路比指标的风电汇集系统稳定性分析  

Stability analysis of dense wind power area based on short circuit ratio index

作　　者：吴林林 李蕴红 于思奇 孙雅旻 王潇 杨艳晨 邓晓洋 苏田宇 孙大卫 WU Linlin;LI Yunhong;YU Siqi;SUN Yamin;WANG Xiao;YANG Yanchen;DENG Xiaoyang;SU Tianyu;SUN Dawei(State Grid Wind-Photovoltaic-Energy Storage Hybrid Power Generation Technology Laboratory,State Grid Jibei Electric Power Research Institute,Beijing 100045,China)

机构地区：[1]国网冀北电力科学研究院国家电网公司风光储联合发电运行技术实验室,北京100045

出　　处：《电力自动化设备》2022年第8期72-78,共7页Electric Power Automation Equipment

基　　金：国家电网有限公司总部管理科技项目(52018K21N00H)。

摘　　要：短路比(SCR)是一种描述“系统强弱”的指标,目前电力系统运行部门正在探索应用SCR指标评估风电汇集系统稳定性的方案。为探究SCR在风电汇集系统稳定性工程化评估过程中的价值,分析SCR指标的适用范围与条件,基于主流风电机组厂家控制器实物开展研究,考虑实际风电机组特性,分析应用SCR指标评估风电汇集系统静态电压稳定、暂态过电压和次/超同步振荡3类稳定问题的适用性。研究发现:提升系统SCR指标可不同程度地缓解上述3类稳定问题的严重程度;若在评估过程中不考虑风电机组的特性差异,则SCR指标难以准确反映上述3类问题的系统稳定裕度。SCR(Short Circuit Ratio)is an index to describe the“system strength”.Currently,the power system operation department is exploring how to use SCR index to evaluate the stability of dense wind power area.To explore the value of SCR in engineering evaluation process of dense wind power area stability,and analyze the suitable range and condition of SCR index,the studies are carried out based on the physical controllers made by wind turbine manufacturers with the highest market share.Considering the actual wind turbine characteristics,the feasibility of evaluating stability of dense wind power area by SCR index is analyzed from three aspects of static voltage stability,transient overvoltage and sub-/super-synchronous oscillation.It is found that increasing SCR index of system can improve the above three types of stability problem from different degrees.Moreover,if the differences of wind turbine characteristics are not considered in the evaluation process,the SCR index cannot accurately reflect the system stability margin of the above three types of problems.

关 键 词：风电 短路比 静态电压稳定 暂态过电压 宽频振荡 故障穿越 

分 类 号：TM614[电气工程—电力系统及自动化] TM712