动态电压恢复器的控制策略  

Control strategy of dynamic voltage restorer

作　　者：史伟伟[1] 唐国庆[1] 李俊[1] 

机构地区：[1]东南大学电气工程学院,南京210096

出　　处：《东南大学学报（自然科学版）》2007年第1期64-69,共6页Journal of Southeast University：Natural Science Edition

基　　金：江苏省博士后科研资助项目(1660631105);江苏省教育厅自然科学基金资助项目(04KJ13470010)

摘　　要：通过把负载电压看作动态电压恢复器(DVR)的控制对象,开关器件的占空比看作控制量,电网电压和负载电流看作干扰量,可将DVR的数学模型简化为单输入单输出系统.结合控制量的计算方法,推导出了控制量到被控对象和干扰量到被控对象的传递函数.分析传递函数可知,负载电流特别是其中的高频分量会使DVR的补偿性能变坏.提出了误差校正控制方法,在传统电网电压前馈的基础上通过误差校正实现了负载电流前馈,基本消除了负载电流的影响.仿真结果验证了理论分析的正确性.Regarding the load voltage as control object, the duty ratio of the power devices as control variable, and the utility voltage and load current as interferences, the mathematic model of dynamic voltage restorer （DVR） can be simplified as a single-input and single-output （SISO） system. With the computing method of control variable, the transfer functions from control variable to control object and from interferences to control object are derived. Based on the transfer functions, it is concluded that the compensating performance of DVR is always deteriorated by the load current, especially by its high frequency components. A novel error-correcting control method is proposed then, by which not only the utility voltage feed forward is used but the load current feed forward is also realized. With this method, the influence of the load current is eliminated. Simulation results verified the correctness of theoretical analysis.

关 键 词：电力系统及其自动化 动态电压恢复器 负载电流 误差校正 

分 类 号：TM762[电气工程—电力系统及自动化]