电压型PWM整流器比例-积分控制器的参数设计

PWM整流器采用直接电流控制策略和双闭环控制结构,内环电流控制器采用电流反馈和电压前馈的解耦控制策略,利用PI调节实现电流的快速跟踪控制。外环电压控制器由PI控制器构成,能够保证直流电压的稳定运行。由整流器的控制结构及其在旋转dq坐标系下引入PI调节器后的数学模型,简化得到电压环、电流环传递函数,根据控制系统要求采用3种方式设计PI参数。分析3种方式设计的PI参数下系统抗扰动性,用MATLAB仿真验证设计方法的正确性,结果表明在采用典型二型系统设计和二阶系统设计方法下,系统具有良好的动态性和稳定性。

PI Regulator and Parameter Design of Voltage PWM Rectifier

PWM rectifier adopts direct current control strategy and dual closed loop structure. Decoupled control structure consisting of current feedback and voltage feed-forward is adopted in the inner current control loop. PI regulator is adopted so as to track the reference current quickly. The outer voltage loop with PI regulator makes the voltage stable. With the structure of the PWM rectifier and its mathematical model which achieved under rotated coordinates after applying PI regulator transfer functions of voltage and current can be gained. According to the demand of control system, PI parameters were designed in three methods. The three methods were analyzed according the stability of the system. Matlab simulation results proved the validity of the design method and the superiority to the mobility and stability of system of the second and third methods.