Compound control method for DC–DC converter

Abstract

Considering the problems of internal and external disturbances, i.e. time-varying load, inaccurate system model and external uncertainties etc., a compound control strategy based on model predictive control (MPC) and non-linear extended state observer (ESO) are proposed to attenuate the output voltage fluctuation under continuous conduction mode (CCM) mode of the buck circuits. In addition, a non-linear ESO is used to observe all kinds of uncertainties caused by internal and external disturbances and to eliminate their effects by compensating these disturbances in the feed-forward channel. Compared with the pure MPC control, the simulation results show that the proposed composite control method has the better disturbance suppression effect and also can effectively improve the stability of the buck circuit.

Keywords

• feedforward
• nonlinear control systems
• control system synthesis
• observers
• stability
• dc-dc power convertors
• predictive control
• compound control method
• dc–dc converter
• internal disturbances
• external disturbances
• time-varying load
• inaccurate system model
• external uncertainties
• compound control strategy
• model predictive control
• output voltage fluctuation
• ccm mode
• buck circuit
• nonlinear eso
• pure mpc control
• composite control method
• disturbance suppression effect