An Adaptive Passivity-Based Controller of a Buck-Boost Converter With a Constant Power Load

Wei He (1) , Romeo Ortega (2) , Juan E. Machado , Shihua Li (3)

1 Department of Mechanics, Tianjin University
2 L2S - Laboratoire des signaux et systèmes
3 Department of Human Genetics

This paper addresses the problem of regulating the output voltage of a DC-DC buck-boost converter feeding a constant power load,which is a problem of current practical interest. Designing a stabilising controller is theoretically challenging because its average model is a bilinear second order system that, due to the presence of the constant power load,is non- minimum phase with respect to both states.Moreover,to design a high performance controller, the knowledge of the extracted load power, which is difficult to measure in industrial applications, is required. In this paper, an adaptive interconnection and damping assignment passivity based control that incorporates the immersion and invariance parameter estimator for the load power is proposed to solve the problem. Some detailed simulations are provided to validate the transient behaviour of the proposed controller and compare it with the performance of a classical PD scheme.

Domaines: Automatique; Automatique / Robotique

Wei He, Romeo Ortega, Juan E. Machado, Shihua Li. An Adaptive Passivity-Based Controller of a Buck-Boost Converter With a Constant Power Load. Asian Journal of Control, 2019, 21 (2), pp.1-15. ⟨10.1002/asjc.1751⟩. ⟨hal-02418693⟩