Research on decoupling equalization control strategy based on complex coupled inductors

Abstract

In this paper, a decoupling equalization control strategy based on complex coupled inductors is proposed to address the control difficulties caused by compound coupled inductors in the interleaved-parallel triple-coupled inductor-based boost converter (IP-TCIBC). First, the phase inductors are uncoupled from the output filter inductors by analyzing the decoupling and denationalizing the conductance matrices of the phase inductors to realize the phase inductor decoupling. The control block diagram is simplified by correcting the independent current inner loops of the two phases to identical type I systems, based on which the voltage–current dual closed-loop control is realized by adding a common voltage outer loop and rectifying it to a type II system. MATLAB/Simulink builds the closed-loop equalization control model, and the simulation verification shows that: under the proposed control strategy, the two-phase inductor currents are completely equal, the equalization effect is good and stable, and it is not affected by the disturbance of sudden change of internal resistance. The system has strong anti-interference ability, the voltage and current response is rapid during the sudden change of the load, and the dynamic performance is superior; the output voltage is stable, the overshooting amount is small, and the recovery time is fast. The results verify the correctness and effectiveness of the control strategy and provide new ideas and methods for solving the complex coupled inductor equalization control problems in DC–DC converters.