逆变器谐波及电流扰动抑制策略仿真

Simulation of Inverter Harmonic and Current Disturbance Rejection Strategy

针对三相逆变器的优化控制问题,为提高稳态精度和实现无静差跟踪,提出了一种新的基于双闭环的多重比例谐振控制策略。其中内环电流环采用比例控制,外环电压环采用两相静止坐标系和两相旋转坐标系结合的方法,用多重比例谐振控制器进行控制。外环在两相静止坐标系上用二重比例谐振控制器,用于跟踪基波及抑制3次谐波,在两相旋转坐标上用谐振控制器,用于抑制5,7次谐波。分析了控制器的各个参数对系统输出的影响。用MATLAB仿真分析了上述控制器电流抗扰性能。通过仿真与比例积分控制器作用下的输出电压波形及谐波畸变率作对比,证明了上述控制策略的优越性,为逆变换器优化设计提供了参考。

A new control strategy of three-phase inverter with multi-proportional resonant based on dual closed-loop is proposed. The inner current loop adopts the proportional controller,while the outer voltage loop adopts multi-proportional resonant controller based on two-phase stationary coordinate system and two-phase rotating coordinate system. The double proportional resonant controller is applied to the two phase stationary coordinate system,which is used to track the fundamental wave and suppress the 3 harmonic,and the resonant controller is applied to the two phase rotating coordinate for suppressing the 5 and 7 harmonics. The effects of various parameters of the controller on system output are analyzed in detail. Current disturbance rejection performance is simulated by MATLAB.The output voltage waveform and total harmonic distortion are compared with PI controller by Simulation. The superiority of the proposed control strategy is demonstrated.