基于电压迭代的直驱风电场短路电流计算方法  

A short-circuit current calculation method for direct-driven wind farms based on voltage iteration

作　　者：骆尧涵 汤皓环 李金裕 侯山 薛安成 LUO Yaohan;TANG Haohuan;LI Jinyu;HOU Shan;XUE Ancheng(Yixing Power Supply Branch,State Grid Jiangsu Electric Power Co.,Ltd.,Wuxi,Jiangsu 214200,China;Guangzhou Power Supply Bureau,Guangdong Power Grid Co.,Ltd.,Guangzhou 510620,China;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Beijing 102206,China;Shijiazhuang Power Supply Branch of State Grid Hebei Electric Power Co.,Ltd.,Shijiazhuang 050051,China)

机构地区：[1]国网江苏省电力有限公司宜兴市供电分公司,江苏无锡214200 [2]广东电网有限责任公司广州供电局,广州510620 [3]新能源电力系统国家重点实验室(华北电力大学),北京102206 [4]国网河北省电力有限公司石家庄供电分公司,石家庄050051

出　　处：《浙江电力》2024年第10期75-84,共10页Zhejiang Electric Power

基　　金：国家重点研发计划(2021YFB2401000)。

摘　　要：风电场短路电流计算普遍采用等值模型,不计内部线路、变压器等因素,精度欠佳;而考虑上述因素的短路电流计算方法多采用电压电流同时迭代的方式,其收敛性难以直观验证。为此,提出了一种计及风电场内部结构参数的短路电流算法。首先,结合限幅作用下的D-PMSG(永磁直驱风电机组)电流特性与最大维度的风电场节点电压方程,构建了风电场短路电流计算模型;其次,利用诺顿等值消去未知电流参数,并结合工况变化确定修正的节点电压方程;最后,结合电压迭代,得出了基于修正模型和风电场特性的短路电流计算方法。仿真对比结果表明,所提方法具有较高的准确性以及更好的收敛性。Short-circuit current calculations for wind farms typically employ equivalent models that neglect internal lines,transformers,and other critical factors,leading to reduced accuracy.Methods that account for these factors often rely on simultaneous voltage and current iteration,which complicates the intuitive verification of convergence.To address such issues,this paper proposes a short-circuit current calculation method that incorporates the internal structural parameters of wind farms.Based on the current characteristics of direct-driven permanent magnet synchro-nous generators(D-PMSG)under current-limiting conditions and the equations for the maximum node voltage of wind farm,a calculation model for short-circuit current in a wind farm is built.Then,Norton equivalence is applied to eliminate unknown current parameters,and the modified node voltage equation based on varying operating condi-tions is established.Finally,by implementing voltage iteration,a modified short-circuit current calculation method based on the modified model and the characteristics of the wind farm is obtained.Simulation comparisons demon-strate that the proposed method offers enhanced accuracy and improved convergence.

关 键 词：大规模风电场 短路电流 永磁直驱风电机组 迭代计算 限幅作用 

分 类 号：TM614[电气工程—电力系统及自动化]