Finite-time control for DC-AC inverter system with mismatched disturbances using continuous nonsingular terminal sliding modes

An output voltage regulation problem for single-phase DC-AC inverter system under external input voltage variations and load resistance uncertainties is investigated in this paper via a continuous nonsingular terminal sliding mode control (NTSMC) approach. Aiming to reject the effects of mismatched disturbances, the finite-time disturbance observer (FTDO) is introduced for disturbance estimations within the DC-AC circuit. By integrating the disturbance estimation information into the design of the nonlinear dynamic sliding mode surface, a finite-time NTSMC method is developed to achieve finite time tracking performance in the presence of mismatched disturbances and uncertainties. It is shown that the proposed method can guarantee the stability of closed-loop system. The robustness of the proposed controller against input voltage variations and load uncertainties is demonstrated by simulation results.

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