Robust Passivity-Based Control of Boost Converters in DC Microgrids

TL;DR

This paper presents a robust, decentralized passivity-based control method for voltage regulation in DC microgrids with unknown loads, validated through theoretical analysis and real-world experiments.

Contribution

It introduces a Krasovskii-type storage function and establishes a passivity property for DC microgrids with unknown ZIP loads, enabling robust voltage control.

Findings

The control scheme ensures convergence to the desired voltage equilibrium.

The approach is validated through experiments on a real DC microgrid.

The method effectively handles unknown load conditions.

Abstract

This work deals with the design of a robust and decentralized passivity-based control scheme for regulating the voltage of a DC microgrid through boost converters. A Krasovskii-type storage function is proposed and a (local) passivity property for DC microgrids comprising unknown 'ZIP' (constant impedance 'Z', constant current 'I' and constant power 'P') loads is established. More precisely, the input port-variable of the corresponding passive map is equal to the first-time derivative of the control input. Then, the integrated input port-variable is used to shape the closed loop storage function such that it has a minimum at the desired equilibrium point. Convergence to the desired equilibrium is theoretically analyzed and the proposed control scheme is validated through experiments on a real DC microgrid.