基于聚合短路比的大型风场次同步振荡风险初筛  

Risk screening of SSO induced in large-scale wind farms based on aggregated short circuit ratio

作　　者：毕天姝 李景一 BI Tianshu;LI Jingyi(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Beijing 102206,China)

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),北京102206

出　　处：《电力系统保护与控制》2019年第5期52-59,共8页Power System Protection and Control

基　　金：国家重点研发计划资助(2017YFB0902004);国家自然科学基金项目资助(51725702);高等学校学科创新引智计划资助(B08013);国家电网公司科技项目资助(529926160002)~~

摘　　要：大型风场数量众多,逐一针对各风场进行精细化建模与次同步振荡风险分析,面临风场建模、参数获取及所需时间较长的问题。采用计算并网系统短路比的方法确定系统强度,用来对风场次同步振荡风险进行评估。基于常规短路比公式分析表明,该方法仅能考虑并网点处系统短路容量及风场容量,难以准确反应大型风场次同步振荡风险。由此,提出了一种计及多风场因素的聚合短路比计算方法,给出相应的计算公式。该计算方法能够反映风场网架情况、子风场交互作用以及控制系统对次同步振荡的影响。经过典型系统及实际系统算例分析,聚合短路比计算方法能够正确计算不同控制系统下风场次同步振荡风险,能够对具有不同拓扑结构的四个实际风场进行次同步振荡风险排序,验证了所提方法应用于风场次同步振荡风险初筛的可行性。There are so many large-scale wind farms,that detailed modeling and SSO risk analysis for each wind farm one by one will face the difficulty of wind farm modeling,parameter acquisition and longer time spending.The system strength is determined by calculating the Short-Circuit Ratio(SCR)of grid-connected system,which is used to evaluate the SSO risk of wind farm.Analysis based on conventional SCR formula shows that the method can only consider the short-circuit capacity and wind farm capacity at the grid-connected point,and it is difficult to accurately reflect the SSO risk of large-scale wind farm.A calculation method of Aggregate Short-Circuit Ratio(ASCR)is proposed,and the corresponding formula is given.The calculation method can reflect the influence of the factors on SSO,including the grid structure of wind farm,the interaction of sub-wind farms and the control system.Through analyzing the typical and practical system examples,the ASCR can correctly calculate the SSO risk of wind farm for different control systems,and rank the SSO risk of four actual wind farms with different topological structures,which verifies the effectiveness of the method on risk screening of wind farm SSO.

关 键 词：大型风场 网架结构 次同步振荡 风险初筛 聚合短路比 

分 类 号：TM712[电气工程—电力系统及自动化] TM614