基于反向电流跟踪的双馈风机低电压穿越控制策略  

An Improved Control Strategy of Doubly-Fed Wind Turbine under Voltage Dips Based on Reverse Current Tracking

作　　者：陈鉴庆 邹旭东[1] 梁宗泽[1] 童力[1] 熊威[1] 朱东海[1] 

机构地区：[1]强电磁工程与新技术国家重点实验室(华中科技大学),武汉430074

出　　处：《电工技术学报》2016年第2期221-229,共9页Transactions of China Electrotechnical Society

基　　金：国家重点基础研究发展计划(973计划)(2012CB215100);国家自然科学基金(51477064)资助项目

摘　　要：通过励磁控制实现双馈机组的低电压穿越(LVRT)是风力发电的热点问题之一。现有的改进励磁控制策略一般需要磁链的准确观测和相序的快速分离,不易实现,并且存在较大的转矩脉动。同时根据转子端口等效阻抗特性分析,提出了一种转子电流反向跟踪定子电流的电流跟踪控制策略。该策略将定子电流乘上适当系数后作为转子电流的指令值,其结构简单,而且理论上能消除电磁转矩脉动。仿真和实验结果表明,该策略能在深度故障下实现机组的LVRT可控运行,并能有效抑制转矩脉动,在超同步20%时,能实现电网电压对称跌落80%或单相全跌落的LVRT。The low voltage ride through （LVRT） of doubly-fed induction generator （DFIG） via excitation control during severe faults is one of the highlights in wind energy conversion system （WECS）. In current most control strategies need accurate observation and fast sequence separation of flux, and will lead to the torque pulsation. After summarizing the common characteristics of various efficient low voltage ride-through control strategies on the port from the perspective of physics principle, a reverse current tracking control strategy is then proposed in this paper. The stator current multiplied by a certain coefficient is set as the reference of rotor current during the faults, which is simple in structure and can restrain the torque pulsation effectively. Case study verifies the effectiveness of the improved method. It is shown that using the proposed method, at 20% over-synchronous speed, the DFIG can achieve LVRT under 80% symmetrical fault or 100% single phase fault.

关 键 词：双馈风机 低电压穿越 深度故障 楞次定律 

分 类 号：TM712[电气工程—电力系统及自动化] TM614