Inverse decoupling adaptive sliding mode control for multilevel Buck converters with constant power load
To solve the problem of strong coupling and the issue of instability caused by negative imped-ance characteristics of multilevel Buck converters with constant power load(CPL),an inverse decoupling adaptive sliding mode control strategy was proposed.The nonlinear mathematical model of multilevel Buck converters with CPL was established.The reversibility of the system was proved by the inverse sys-tem method,and the expression of the inverse system was deduced.The model is linearly decoupled into multiple pseudo-linear subsystems.The negative impedance characteristics are offset.Linear sliding mode surfaces and exponential convergence laws were selected to reduce sliding mode chattering,and an adap-tive mechanism was introduced to the sliding mode control,adaptive sliding mode controllers were de-signed for the linear subsystems respectively to further improve the control performance of the system.Furthermore,the stability and robustness of the control system were verified based on the Lyapunov theo-ry.Compared with the existing control method,the simulation results show that the proposed control strat-egy has stronger robustness and better superiority.Finally,a prototype was built for experiments,and the experimental comparison results verify correctness and effectiveness of the proposed control strategy.
multilevel Buck convertersconstant power loadinverse systemadaptive controlsliding mode controldecoupling control
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