基于合成矢量解耦控制的三相PWM整流器研究

Study on three-phase PWM rectifier based on the complex vectors decoupling control

针对三相静止坐标系下很难实现无静差调节的不足,采用d-q变换将三相交变量转换成同步旋转坐标系下的直流量来控制。但是,由于系统存在d-q坐标系下变量间相互耦合、控制器的设计对系统参数依赖性过强的问题,造成了当网侧电感因老化等原因数值变小时,原系统控制性能会急剧下降的现状,文中提出了基于合成矢量线性化d-q解耦的控制思想,优化了同步旋转d-q坐标系下的电压电流双闭环控制策略,并简要分析了双环控制模型的设计方法。仿真实验表明该模型具有结构简单和较强自适应性。

In order to overcome the defects of the difficulty to obtain zero steady-state error condition , a control strate-gy using d-q transformation through which the three phase variable is converted into DC values in the synchronous ro -tation coordinates is proposed .However , due to the problems that the variables in d-q axis are intercoupling and the dependence between the design of controller and system parameters is strong , the original system control performance will decrease sharply when the value of network side inductance becomes small for aging changes .In this paper , the control strategy based on the complex vector linear d-q decoupling is proposed , the double closed loop control strategy in the d-q synchronous rotation coordinates is improved , and the design method of the double closed loop control mod-el is analyzed .The simulation analysis results demonstrate the proposed model has a simple structure and a strong self -adaptability .