Non‐singular terminal sliding mode control strategy for DC/DC Boost converter system using a finite‐time convergent observer

Abstract

Aiming at such problems as poor dynamic and steady-state performance, and non-ideal anti-interference performance when the traditional sliding mode control is applied in Boost converter, a non-singular terminal sliding mode control (NTSMC) strategy based on finite time convergence is presented in this paper. Taking the inductor's current and output voltage as the state variables of the system, the average state model of Boost converter under continuous conduction mode (CCM) is established, and the differential equations of the inductor's current and output voltage are obtained. According to the above differential equation, a finite-time convergent observer (FCO) is designed to estimate the load resistance and input voltage. By combining these estimated values with the NTSMC method, a novel non-singular terminal sliding surface function and controller are designed, which improves the dynamic, steady-state performance and anti-interference performance of the system. The stability of the system is analyzed according to the Lyapunov stability theory. The simulation and experimental results show that, compared with the traditional sliding mode control, the control algorithm proposed in this paper has stronger anti-interference ability.