双馈风电机组多机并网系统短路电流计算方法  

Short Circuit Current Calculation of Power System With DFIG Wind Turbines

作　　者：张金华[1] 陈琳浩 王晨清 张保会[1] 郝治国[1] ZHANG Jinhua;CHEN Linhao;WANG Chenqing;ZHANG Baohui;HAO Zhiguo(School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi Province,China;Electric Power Research Institute,State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 211103,Jiangsu Province,China)

机构地区：[1]西安交通大学电气工程学院,陕西省西安市710049 [2]国网江苏省电力有限公司电力科学研究院,江苏省南京市211103

出　　处：《电网技术》2019年第3期887-894,共8页Power System Technology

基　　金：国家重点研发计划项目(2016YFB0900600)~~

摘　　要：双馈风电机组(doubly-fed induction generator,DFIG)多机并网系统发生故障时,各DFIG采用的控制方式和短路计算模型不尽相同,会对电网短路电流分布产生影响。为此,提出一种计及DFIG控制方式判断的电网短路电流计算方法。DFIG控制方式主要取决于机端电压跌落程度,因此针对具有辐射状接线结构的DFIG多机并网系统,分析了持续励磁控制和投crowbar保护两种控制方式下DFIG故障模型对系统故障电压分布的影响,根据所得电压分布特性提出一种故障后DFIG多机控制方式判断方法。然后与传统的同步发电机供电系统对比,给出了适用于DFIG并网系统的节点电压方程以及电网短路计算程序框图。最后以6台DFIG接入电网为例,仿真验证了所提DFIG控制方式判断方法和短路电流计算方法的有效性。When a fault occurs in the power system with multiple DFIGs(doubly-fed induction generators), the control scheme and short circuit calculation model of the DFIGs are not all the same, thus affecting short circuit current distribution in the power system. This paper proposes a short circuit calculation method for the power system, involving the determination process of the DFIG control schemes. The control scheme of a DFIG mainly depends on its terminal voltage drop. In this paper, the influence of DFIG fault models under continuous excitation control and crowbar protection control on fault voltage distribution for the power system with a radial wiring structure is analyzed. According to the obtained voltage distribution characteristics, a determination method for the post-fault control schemes of the DFIGs is proposed. Then, by contrast with the system based on conventional synchronous generators, the node voltage equations and short circuit calculation program chart for the power system with DFIGs are given. At last, a power system with 6 DFIGs is simulated to verify effectiveness of the proposed determination method for DFIG control scheme and the short circuit calculation method.

关 键 词：风力发电 双馈风电机组 短路电流 故障等值模型 低电压穿越控制 

分 类 号：TM614[电气工程—电力系统及自动化]