Reduced‐order extended state observer based event‐triggered sliding mode control for DC‐DC buck converter system With parameter perturbation

Abstract

AbstractAiming to reduce the influence of system model parameter uncertainties for the DC‐DC buck converter control system with high performance requirement, a reduced‐order extended state observer based event‐triggered sliding mode control method (RESO‐ESMC) is proposed in this paper. First, a reduced‐order extended state observer is designed to estimate the system state and total disturbances, including load resistance disturbance and input voltage variation. Then, based on the estimation, the novel event triggered sliding mode controller is constructed for the DC‐DC buck converter system, aiming for the event triggered mechanism to avoid unnecessary computation. In addition, it should be noted that, unlike the extended state observer based sliding mode control method (ESO‐SMC) presented in [1], the proposed method in this paper uses a reduced‐order extended state observer, that is simple to implement and does not require the current sensor, which reduces the cost in practical applications. The stability of the closed‐loop system is also analyzed using Lyapunov stability theorem. Compared with re‐designed ESO‐SMC, which is also in current sensor‐less mode, simulation and experimental results show that the proposed control method performs better in transient and disturbance rejection, but the steady state performance is sacrificed.