Dynamic Economic Dispatch and Transient Control of Distributed Generators in a Microgrid

Microgrids have multiple distributed generators (DGs) with increased penetration of renewable energy sources. Efficient integration of these DGs in a microgrid, whether in grid-connected or islanded mode, poses many challenges, such as optimal power sharing, control of load-side and generator-side transients, and economic dispatch (ED), to name a few. Different control strategies for power sharing and ED fall short in providing good dynamic performance. To address this issue, we propose a novel solution that provides ED with improved dynamic performance. Specifically, the ED problem employs dynamic performance controller based on proportional-integral-derivative control for improved performance by using an augmented Lagrangian-based approach. For the distributed coordinated control of DGs, we utilize a multiagent system architecture. The performance evaluation results show that the proposed solution for ED improves the overall system performance of the microgrid. The system achieves an optimal state, where DGs operate at minimum cost while improving the transient response during load or generator switching.