An Adaptive Passivity‐Based Controller of a Buck‐Boost Converter with a Constant Power Load

• Published in: Asian journal of control Vol. 21; no. 1; pp. 581 - 595
• Main Authors: He, Wei, Ortega, Romeo, Machado, Juan E., Li, Shihua
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc 01.01.2019; Asian Control Association (ACA) and Chinese Automatic Control Society (CACS)
• Subjects: Adaptive control; Automatic; Automatic Control Engineering; Buck‐boost converter; Computer Science; Computer simulation; constant power load; Control systems design; Converters; Damping; Engineering Sciences; immersion and invariance; Industrial applications; interconnection and damping assignment passivity based control; Parameter estimation; Passivity; Random access memory; Submerging; Voltage converters (DC to DC)
• ISSN: 1561-8625; 1934-6093
• DOI: 10.1002/asjc.1751

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.