A Brief Review on DC-Link Control Strategies in Microgrids

Traditional power systems are gradually being restructured using distributed generation (DG) units. Employing DGs has created several topologies in AC, DC, and AC/DC microgrids. Most of these resources generate DC power or at least require a DC link to connect to the grid, and on the other hand, the current network infrastructure runs on AC power. In fact, the DC link is an interconnection bridge between the AC side and the DC side of the power grid. In addition, the control techniques applied to the DC link greatly affect the power-flow convergence of unified AC/DC networks. Therefore, identifying and implementing the optimal methods in order to accurately control the DC link is of paramount significance. This paper briefly reviews the effective strategies for controlling DC links in microgrids.