不对称电网故障下的正序电压分量补偿法  

Compensation Method Based on Positive Sequence Voltage Component under Asymmetrical Grid Fault

作　　者：王晓兰[1] 鲜龙[1] 包广清[1] 张晓英[1] 马呈霞[2] 

机构地区：[1]兰州理工大学电气工程与信息工程学院,甘肃兰州730050 [2]甘肃电力科学研究院,甘肃兰州730050

出　　处：《电气传动》2015年第2期63-69,共7页Electric Drive

基　　金：国家自然科学基金资助(50967001);甘肃省自然科学基金资助(1107RJZA272);国家电网公司科研项目资助(2012KJ-01-04)

摘　　要：针对双馈风力发电系统中的不对称电网电压故障,基于正负序分解的思想,提出了一种正序电压分量补偿方法,通过使用该方法将不对称故障问题的处理转化为对称故障问题的处理。提出了实现正序电压分量补偿法的拓扑结构和控制策略,并确定了正序电压参考值的计算方法。在Matlab/Simulink中构建了相应的仿真模型,通过不同故障类型和不同电压跌落程度下的仿真,验证了该方法在不对称电网故障下提高双馈风力发电机组低电压穿越能力的有效性。Aimed at asymmetric grid fault in wind power system of DFIG,based on the principle of positive andnegative sequence decomposition,a compensation method based on positive sequence voltage component was putforward,changed the problem of asymmetric grid fault to the symmetrical fault by using the method. The topology andcontrol strategy to implement the compensation method was researched,and determined the method to calculate thereference value of positive sequence voltage. The corresponding simulation model in the Matlab/Simulink was build.The simulation results under different fault types and different levels of voltage dip verify the effectiveness of theproposed method in improving LVRT ability of DFIG.

关 键 词：正序电压 不对称故障 低电压穿越 超级电容器 双馈感应发电机 

分 类 号：TM614[电气工程—电力系统及自动化]