Research on system control method of isolated AC/DC converter

Abstract:
Isolated AC/DC converter has power bidirectional flow, electrical isolation, high control degree of freedom, high power density and other advantages, plays an important role in energy storage systems, In this paper, the circuit topology, working principle and control method of the converter are deeply studied. An improved control strategy is proposed. The front stage adopts direct current control method, Model predictive control is introduced between front and rear stages, Through MPC, the optimal shift ratio is selected for control in each control cycle. So you don't have to use a PI adjuster to adjust the shift, The time for the system to reach steady state is greatly reduced. A grouping optimization model predictive control method is proposed. By grouping optimization objects into multiple optimization groups, it greatly reduces the amount of computation required for cyclic optimization of model prediction.