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Reduced‐order extended state observer based event‐triggered sliding mode control for DC‐DC buck converter system With parameter perturbation
Author(s) -
Wang Junxiao,
Rong Jiayi,
Yu Li
Publication year - 2021
Publication title -
asian journal of control
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.769
H-Index - 53
eISSN - 1934-6093
pISSN - 1561-8625
DOI - 10.1002/asjc.2301
Subject(s) - control theory (sociology) , sliding mode control , state observer , perturbation (astronomy) , buck converter , lyapunov stability , observer (physics) , lyapunov function , controller (irrigation) , computer science , voltage , engineering , control (management) , physics , nonlinear system , quantum mechanics , artificial intelligence , agronomy , electrical engineering , biology
Aiming 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.