Approximate Sensitivity Conditioning and Singular Perturbation Analysis for Power Converters

TL;DR

This paper introduces a sensitivity conditioning control strategy for power converters, analyzing its impact via singular perturbation theory and demonstrating its practical implementation through simulations and experiments on buck converters and PMSMs.

Contribution

It develops an approximate sensitivity conditioning method for power converters and analyzes its effectiveness using singular perturbation theory, with practical validation.

Findings

Improved voltage regulation in buck converters

Enhanced control performance in PMSMs

Feasibility of implementing approximate sensitivity conditioning

Abstract

A sensitivity conditioning control strategy is analyzed in this paper and it is applied to power electronic converters. The term is used to improve closed loop systems, such as power converters with cascaded inner and outer loop controllers. The impact of the sensitivity term is analyzed using singular perturbation theory. In addition, the implementation of the control term is addressed for practical systems, where the number of inputs is generally not sufficient for exact sensitivity conditioning. Simulation results are presented for a buck converter with output capacitor voltage regulation and a Permanent Magnet Synchronous Machine (PMSM), used as a generator with an active rectifier. Finally, experimental results are presented for the buck converter, demonstrating the advantages and feasibility in implementing the approximate sensitivity conditioning term for closed loop power converters.