不对称短路故障下永磁直驱风电机组并网控制策略研究  

Research on Grid Connection Control Strategy of Permanent Magnet Direct Drive Wind Turbine under Asymmetric Short Circuit Fault

作　　者：陶大军[1] 闫涵 TAO Dajun;YAN Han(Harbin University of Science and Technology,Harbin 150080,China;State Grid Inner Mongolia Eastern Electric Power Co.,Ltd.,Chifeng Power Supply Company,Chifeng 024000,China)

机构地区：[1]哈尔滨理工大学,哈尔滨150080 [2]国网内蒙古东部电力有限公司赤峰供电公司,内蒙古赤峰024000

出　　处：《大电机技术》2024年第2期1-8,共8页Large Electric Machine and Hydraulic Turbine

摘　　要：电网侧发生不对称故障时,永磁直驱风电机组并网电流会发生三相不平衡的问题。针对这一问题,提出一种基于自适应陷波器的网侧换流器控制策略。该控制策略基于解决机组并网电流二倍频分量的思想,在电网侧发生不对称短路故障时,将进入逆变器的dq坐标系下的二倍频电压分量去除,从而使得网侧换流器输出的电流达到三相平衡。本文首先分析了电网侧发生不对称短路故障后永磁直驱风力发电机组的动态响应;然后建立了机侧和网侧换流器的模型,并分别采用了双闭环矢量控制技术和基于自适应陷波器的控制策略;最后进行仿真分析,验证了改进后的控制策略相较于传统控制策略,有效解决了不对称短路故障下并网电流三相不平衡问题。When an asymmetric fault occurs at the grid side,the grid connected current of the permanent magnet direct drive wind turbine will be unbalanced.To solve this problem,a grid side converter control strategy based on adaptive notch filter is proposed.The control strategy is based on the idea of solving the double frequency component of the grid connected current of the unit.When the asymmetric short-circuit fault occurs at the grid side,the double frequency voltage component entering the dq coordinate system of the inverter is removed,so that the output current of the grid side converter reaches three-phase balance.Firstly,this paper analyzes the dynamic response of permanent magnet direct drive wind turbine after asymmetric short-circuit fault on the grid side.Then the models of generator side and grid side converters are established,and the double closed-loop vector control technology and the control strategy based on adaptive notch filter are adopted respectively.Finally,the simulation analysis verifies that the improved control strategy effectively solves the three-phase imbalance of grid connected current under asymmetric short-circuit fault compared with the traditional control strategy.

关 键 词：直驱风电机组 不对称短路故障 故障穿越 并网电流 

分 类 号：TM301.2[电气工程—电机]