Distributed Cooperative Secondary Control of Microgrids Using Feedback Linearization

This paper proposes a secondary voltage control of microgrids based on the distributed cooperative control of multi-agent systems. The proposed secondary control is fully distributed; each distributed generator only requires its own information and the information of some neighbors. The distributed structure obviates the requirements for a central controller and complex communication network which, in turn, improves the system reliability. Input-output feedback linearization is used to convert the secondary voltage control to a linear second-order tracker synchronization problem. The control parameters can be tuned to obtain a desired response speed. The effectiveness of the proposed control methodology is verified by the simulation of a microgrid test system.

I. Introduction

The electric power system is experiencing a rapid transformation to an intelligent electric network, the so-called smart gird. Microgrids, as the building blocks of smart grids, are small-scale power systems that facilitate the effective integration of distributed generators (DGs) [1]–[3]. Proper control of microgrids is a prerequisite for stable and economically efficient operations of smart grids [5], [6]. Microgrids can operate in both grid-connected and islanded operating modes.