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A Study on Macromodel of Single-Phase Full-Bridge Inverter Considering Unipolar SPWM and Synchronous Rotating Frame for Improving Model Accuracy and Control Performance

In modeling single-phase full-bridge inverter, instantaneous model with a switching function is generally used to model the power conversion system consisting of switching power poles. However, the equivalent circuit model using a switching function is useful in emulating the response which is close to real power model but it has drawback of steady state response in designing the controller due to limited bandwidth of the control system. Thus, in design the control system of power converter, d-q based model in synchronous rotating frame has been used to model the power conversion system. Nevertheless, the d-q model of power conversion system cannot emulate and reflect the switching characteristics caused by modulation in conventional. Therefore, this paper proposes the macromodel of single-phase full-bridge inverter considering the unipolar switching in synchronous rotating frame. The proposed macromodel of this paper enables d-q inverter model to present the influence of PWM, improving the accuracy of inverter system. This study has been demonstrated by mathematical model and PSIM simulation.