一种基于内模控制的三相电压型PWM整流器控制方法  

A Control Strategy of Three-Phase PWM Rectifier Based on Internal Model Control

作　　者：宋文祥[1] 尹赟[1] 

机构地区：[1]上海大学机电工程与自动化学院,上海200072

出　　处：《电工技术学报》2012年第12期94-101,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51107079);上海大学创新基金(A10010909005)资助项目

摘　　要：三相电压型PWM整流器可以减小用电设备对电网的谐波污染并具有比较高的功率因数,因而应用越来越广泛。PWM整流器一般采用双闭环控制,电流内环使用电压前馈解耦型比例积分调节控制。但该方法对整流器准数学模型和参数准确性依赖较强,同时调节器参数繁多导致调试困难。本文将内模控制应用到PWM整流器电流内环控制中,用内模控制器代替传统PI调节器,不需要整流器准确的模型和参数,并能减少系统调节参数,避免重复试验。仿真和实验结果表明,该整流器系统能够保证很高的功率因数和输入电流较好的正弦度,能适应负载和直流母线电压的扰动,电流内环具有很好的跟随和动态性能。The three-phase PWM rectifier has been widely used because it can reduce the harmonic pollution of the power grid and has a high power factor.Traditionally,it adopts two-closed-loop control method and its inner-current loop uses the PI controllers with voltage feed forward decoupling.However,needing the precise mathematical model and hard to adjust due to various PI parameters are the disadvantages of the PI control method.In order to overcome the above problems,this paper brings IMC in the inner-current loop control of PWM rectifier and the conventional PI method is replaced by internal model controller.The simulation and experimental results show that the rectifier system has a high power factor and a well sine input current,meanwhile,it can resist the changes of load and dc line voltage.Also,the inner-current loop has a good follow performance and dynamic performance.

关 键 词：内模控制 PWM整流器 坐标变换 电流内环 解耦控制 

分 类 号：TM461.4[电气工程—电器]