风电系统中几种电网电压跌落检测方法的比较研究  

Comparison Research on Several Voltage Sag Detection Methods for Wind Power System

作　　者：何向涛[1,2,3] 胡书举[1,3] 赵斌[1,3] 

机构地区：[1]中国科学院电工研究所,北京100190 [2]中国科学院研究生院,北京100190 [3]中国科学院风能利用重点实验室,北京100190

出　　处：《电气传动》2010年第7期12-17,共6页Electric Drive

基　　金：863探索导向项目(2007AA05Z421)

摘　　要：新的电网规则要求风电机组具有低电压穿越能力,快速准确地检测出电网电压的跌落故障,是风电机组主控和变流器进行相应控制的前提条件。详细介绍和讨论了适用于三相对称故障的常规dq变换法,适用于单相不对称跌落故障的改进dq变换法和适用于复杂不对称跌落故障的正序电压检测法的工作原理及其优缺点。常规dq变换法和改进dq变换法的仿真和实验结果表明,这两种方法能够快速准确地检测出电网电压的跌落信号,正序电压检测法的仿真结果表明,该方法能够快速准确地检测出复杂故障情况下的电网电压正序分量。Low voltage ride through（LVRT）capability is required by new grid code. When the grid fault occurs, accurate and fast detection of grid voltage component is essential to the wind power control and convert- er control. Conventional dq transformation method for three-phase symmetrical fault,improved dq transforma- tion method for single-phase falling failure and positive sequence method for complex grid faults were explained in detail,inculding its work principles, advantages and disadvantages. Simulation and experimental results show that,conventional dq method and improved dq method are able to compare the rapid and accurate detection of the corresponding grid voltage under fault conditions, meanwhile, simulation results show that detector of posi- tive sequence is suitable for complex grid faults detection.

关 键 词：风电系统 电网故障 低电压穿越 电压跌落检测 正序电压 

分 类 号：TM614[电气工程—电力系统及自动化]