Research on inverter under one-cycle-dual-loop compound control

Abstract

In order to improve the inherent limitations of integrator reset, voltage bias and poor performance with nonlinear load in the traditional bipolar one-cycle controlled inverter, a compound control strategy is proposed, which combines unipolar one-cycle control at the front stage and dual-loop control, capacitor voltage outer loop and the inductor current inner loop, at the rear stage. The inverter under unipolar one-cycle control has strong ability to resist power disturbance, and there is no integrator reset and voltage offset problem. The voltage and current dual-loop control improves the dynamic performance and the nonlinear load carrrying capacity of the inverter. The working principle of the inverter under the compound control strategy is described in detail. The simulation and experiment results show that the inverter has good output characteristics under this strategy, and the effectiveness of the strategy is demonstrated.