Second-order sliding mode control based on dual Buck inverters

A new dual Buck bidirectional (DC-AC) inverter is presented, and in order to improve the steady-state precision and current transient performance of sliding mode control, a new the fourth-order system with second-order sliding mode control strategy is proposed. The circuit dynamic model, operating-principle and controller design of the strategy are given in the paper. The experiment results show that the fourth-order sliding mode control strategy with the integral and current unit greatly reduces the steady-state final error of the system; the output voltage and current of the system has fine output waveforms, transient state response and robustness; the control method can weaken the perturbation and excursion.