A AC side equivalent resistor modeling and analysis of voltage source PWM converter

The dead-time and device losses are intrinsic phenomena of a voltage source PWM converter. It results in output voltage errors. This paper presents a method of dead-time effect and device loss to resistance model of AC side equivalent. Using the operating point linearization method, system transient analysis is performed. The analysis shows the AC resistance parameter is very important in stability of the system. The describing function analysis improves the model of the converter. We obtain a new stabilized open-loop current controller bode diagram. The prototype set shows that it can be operated. Moreover, it is applied to the tuning of a practical controller. With that equivalent model and proposed method, experimental application to an elevator system shows the validity of this trial