基于三相锁相环的PWM整流器双闭环控制研究

Research on Double Closed Loop Control of PWM Rectifier Based on Three-Phase-Locked Loop

针对三相电压型PWM整流器传统控制方法抗干扰能力较差的问题,研究一种基于三相锁相环的双闭环控制策略。首先应用三相锁相环将PWM整流器由静止abc坐标下的数学模型转换成同步旋转dq坐标下的数学模型,然后采用滑模控制设计电流内环,并应用"边界层法"降低抖震。最后采用PI控制设计电压外环,以减小直流输出侧的稳态误差。仿真结果表明,所提方法具有较好的抗干扰能力。

Aiming at the problem of poor anti-interference ability of the traditional control method of three-phase voltage-type PWM rectifier,a double closed-loop control strategy based on three-phase phase-locked loop is studied. Firstly,the three-phase phase-locked loop is used to convert the PWM rectifier from the mathematical model under static abc coordinates to the mathematical model under synchronous rotating dq coordinates.Then,the current inner loop is designed by sliding mode control,and the"boundary layer method"is applied to reduce the jitter.Finally,PI is used to design the voltage outer loop to reduce the steady-state error on the DC output side.The simulation results show that the proposed method has better anti-interference ability.