Abstract:

In this paper, a super twisting algorithm based sliding mode control method is presented for 9-Level Packed E-Cell inverters. Regulating the load voltage is the main objective in the control of off-grid inverters. To achieve this objective firstly, a sliding mode controller is designed. The output of the sliding mode method contains chattering which causes variable switching frequency. A super twisting algorithm is designed and integrated with the sliding mode control method to reduce the effect of chattering. A modulation signal is generated by the combined algorithms and it is applied to a modulator for generating the switching signals. Thus, the voltage control of Packed E-Cell inverter is achieved. The performance of the proposed algorithm is investigated by simulation studies. The steady-state and dynamic response results show that the proposed control strategy successfully regulates the load voltage with low total harmonic distortions in both cases.