不平衡电压下双馈发电系统控制策略  

Research on Control Strategy for Doubly-fed Generation System under Unbalanced Voltage Condition

作　　者：郑艳文[1] 李永东[1] 柴建云[1] 龚细秀 苑国锋 

机构地区：[1]清华大学电机系,北京市100084 [2]北京清能华福风电技术有限公司,北京市100084

出　　处：《电力系统自动化》2009年第15期89-93,共5页Automation of Electric Power Systems

基　　金：国家科技支撑计划资助项目(2006BAA01A19)~~

摘　　要：由于风力资源分布的特点,许多风电机组被安装在比较偏远的地区,这些地区的电网通常比较薄弱,经常发生不对称运行的情况。若在控制中不予考虑,会引起发电系统有功和无功的脉动。文中基于对称分量理论,建立了不平衡电压下双馈发电机和网侧变流器的数学模型,分析了负序电压对传统双馈发电系统矢量控制策略的影响,并据此提出了一种基于比例谐振调节器的矢量控制策略。理论分析和仿真结果表明,该方法可有效抑制电磁转矩、无功功率和直流母线电压的脉动,实现双馈发电系统在不平衡电压下的稳定运行。Due to the distribution characteristics of wind resources, many wind turbines are installed in remote areas, where the power grid is usually weak and the unbalanced voltage condition often occurs. The unbalanced voltage condition should be taken into account in the control system, otherwise it will cause active and reactive power fluctuations. The models of doubly fed induction generator and grid-side converter under unbalanced voltage are presented based on the symmetrical component theory. The impact of negative sequence voltage on the conventional vector control is analyzed. According to the analysis results, a novel double fed wind generation（DFWG） vector control method based on the proportional resonant （PR） regulator is presented. Theoretical analysis and simulation results show that the proposed strategy is very effective to minimize the torque, reactive power and dc-link voltage fluctuations in unbalanced network.

关 键 词：双馈感应发电机 风力发电 不平衡电压 比例谐振 负序控制 

分 类 号：TM614[电气工程—电力系统及自动化] TM761