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

TL;DR

This paper proposes an adaptive passivity-based control method for a buck-boost converter with a constant power load, addressing stability and load estimation challenges through innovative control design and simulation validation.

Contribution

It introduces a novel adaptive passivity-based controller with load power estimation for stabilizing buck-boost converters under constant power loads.

Findings

The proposed controller effectively stabilizes the converter.

Simulation results show improved transient response.

The method outperforms classical PD control schemes.

Abstract

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.