Dynamic Behaviour of a Series – Connected Multilevel Converter with Interleaved Switching

This paper presents an analysis and design method for the current control of a series connected multilevel converter with interleaved switching. Based on a conventional design method for the parameters of a PI controller, the variable response of a current control circuit with one channel is presented, in dependency of the intervention time of the step on the set value. Then, a model for the equivalent transfer function of the control circuits of the interleaved solution is presented. A new approach for the design of the parameters of the current controller is proposed. The resultant step response in closed loop operation of the system will show the no more fluctuating response regarding overshoot.