Super-Twisting Sliding Mode Control for Grid-Tied T-Type qZSI with Reduced Capacitor Voltage


Komurcugil H., Bayhan S.

IEEE 29th International Symposium on Industrial Electronics (ISIE), ELECTR NETWORK, 17 - 19 June 2020, pp.790-795 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume:
  • Doi Number: 10.1109/isie45063.2020.9152467
  • Country: ELECTR NETWORK
  • Page Numbers: pp.790-795
  • Keywords: T-type quasi-Z-source inverter, sliding mode control, super twisting algorithm

Abstract

This paper proposes a super-twisting sliding mode control (ST-SMC) strategy for a three-phase grid-tied three-level T-type quasi-Z-source inverter (qZSI) with LCL filter. The qZSI topology used in this study offers a reduction in the capacitor voltages. While the dc capacitor voltages and inductor currents in the dc-side are controlled by conventional SMC, the grid current in the ac-side is controlled by ST-SMC. Unlike the existing methods, the use of SMC in the dc-side not only eliminates the need for using PI regulator, but also requires one gain only. The proposed ST-SMC in the ac-side controls the grid current successfully without using a special active damping method. Also, it eliminates chattering and leads to a fixed switching frequency operation. The validity of the proposed control strategy is investigated by computer simulations during steady-state and transients caused by the reference change.