Inverse system optimal control of interleaved boost converters

Dongyi Xiao; Yimin Lu

Inverse system optimal control of interleaved boost converters

Dongyi Xiao

Yimin Lu

Vol. 22, No. 6, pp. 915-922, Jun. 2022

10.1007/s43236-022-00414-0

Interleaved boost converter

Inverse system theory

Optimal control

Constant power load

Abstract

When compared with the conventional boost converter, the interleaved boost converter (IBC) has the advantages of low current stress. Thus, they have been widely used in DC microgrids. However, the IBC is a multiple input single output (MISO) high-order nonlinear system. To simplify the controller design, a reduced order model of an interleaved boost converter is proposed in this paper. By selecting an appropriate output function, the nonlinear reduced order system is transformed into a pseudo-linear system through the inverse system theory. Then an optimal controller is designed based on the linear quadratic regulator (LQR) theory. As a result, the output voltage can track the reference value. In addition, a current balance controller is designed to balance the interphase inductor current. Simulation results of a 3-phase IBC show that when compared with PI control, the proposed control strategy has better regulation performance. Finally, the correctness and eff ectiveness of the proposed control strategy are further verifi ed by experiment on 2-phase IBC.

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Cite this article

[IEEE Style]

D. Xiao and Y. Lu, "Inverse system optimal control of interleaved boost converters," Journal of Power Electronics, vol. 22, no. 6, pp. 915-922, 2022. DOI: 10.1007/s43236-022-00414-0.

[ACM Style]

Dongyi Xiao and Yimin Lu. 2022. Inverse system optimal control of interleaved boost converters. Journal of Power Electronics, 22, 6, (2022), 915-922. DOI: 10.1007/s43236-022-00414-0.