考虑不同故障穿越模式的双馈风电场短路电流计算等值建模  

Equivalent Modeling of Doubly-Fed Wind Farms Short-Circuit Current Calculation Considering Different Fault Ride-Through Modes

作　　者：令狐桐雯 韩民晓[1] 霍启迪 唐晓俊 LINGHU Tongwen;HAN Minxiao;HUO Qidi;TANG Xiaojun(School of Electrical and Electronic Engineering,North China Electric Power University,Beijing 102206,China;State Key Laboratory of Power Grid Security and Energy Conservation,China Electric Power Research Institute,Beijing 100192,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]电网安全与节能国家重点实验室(中国电力科学研究院有限公司),北京100192

出　　处：《南方电网技术》2022年第10期28-37,共10页Southern Power System Technology

基　　金：国家重点研发计划资助项目“光伏/风电场站暂态频率电压主动快速支撑技术”(2021YFB2400500)。

摘　　要：合理的风电场故障暂态等值建模是风电并网运行分析的基础。双馈风电场中各机组在故障时的运行点和故障穿越模式不尽相同,单机倍乘无法准确表征整个风电场暂态特性。以风电场输出短路电流一致为目标,理论推导不同故障穿越模式下单机输出短路电流解析式,以表征外界故障的电压跌落和表征风机自身运行点的转速作为分群指标,在故障不同阶段采用不同指标权重,建立风机相似度距离矩阵。基于层次聚类算法对风电场进行划分,按照输出短路电流不变的原则对同群风机参数进行等值。对比在PSCAD中搭建的风电场详细和等值模型,结果表明,所建立的等值模型可以全面描述风电场出口短路电流特性,等值方法合理有效。Reasonable wind farm faults transient equivalent modeling is the basis for the analysis of grid connected with wind power.In doubly-fed wind farms,the operating points and fault ride-through modes of each unit are different,so single-machine multiplication cannot accurately characterize the transient characteristics of the whole wind farm.Aiming at consistency of wind farm output short circuit current,analytical formula of output short-circuit current under different fault ride-through models of single doubly-fed induction generator(DFIG)machine is theoretically analyzed.Using the voltage drop that indicates external fault and rotate speed that describes its own operating point as the clustering indicators,adopting different indicators weight at different fault stages,DFIG similarity distance matrix is established.The DFIGs are clustered based on hierarchical clustering algorithm,and the parameters of the same cluster are equalized according to the principle of constant output short-circuit current.Comparison results of the wind farm detailed and equivalent model built in PSCAD indicate that the equivalent model can fully describe the characteristics of wind farm output short-circuit current,and the equivalent method is reasonable and effective.

关 键 词：故障穿越 双馈风电场 分群指标 凝聚式层次聚类 短路电流 等值建模 

分 类 号：TM614[电气工程—电力系统及自动化]