Pr. Magdi S. Mahmoud
Systems Engineering Department, KFUPM, Saudi Arabia
Microgrid is an aggregation of distributed generators (DGs), energy storage systems (ESSs) and local loads. It is put forward to solve the ongoing transformation of distribution power system with the integration of various distributed renewable energies . Microgrid has both grid-connected and islanded modes . Over the years, microgrid has been proved to be one of the most effective patterns to utilize DGs in medium and low voltage distribution systems. Due to its operational flexibility and reliability, microgrid provides an excellent platform where the utility grid, DGs, ESSs and local loads interact positively with each other The significant benefits gained by microgrids have led to vast efforts to expand their penetration in electric power systems. Although their deployment is rapidly growing, there are still many challenges to efficiently design, control, and operate microgrids when connected to the grid, and when in islanded mode. Extensive research activities are underway to tackle these issues. It is necessary to have an across-the-board view of the microgrid integration in power systems. This paper presents a review of issues concerning microgrids and provides an account of research in areas related to microgrids, including distributed generation, microgrid value propositions, applications of power electronics, economic issues, microgrid operation and control, microgrid clusters, and protection and communications issues. Given the significant concerns regarding carbon emission from the fossil fuels, global warming and energy crisis, the renewable distributed energy resources (DERs) are going to be integrated in the smart grid. This grid can spread the intelligence of the energy distribution and control system from the central unit to the long-distance remote areas, thus enabling accurate state estimation (SE) and wide-area real-time monitoring of these intermittent energy sources. In contrast to the traditional methods of SE, this paper proposes a novel accuracy dependent Kalman filter (KF) based microgrid SE for the smart grid that uses typical communication systems. Then this article proposes a discrete-time linear quadratic regulation to control the state deviations of the microgrid incorporating multiple DERs. Therefore, integrating these two approaches with application to the smart grid forms a novel contributions in green energy and control research communities. Finally, the simulation results show that the proposed KF based microgrid SE and control algorithm provides an accurate SE and control compared with the existing method. The main goal of this paper is to design a market operator (MO) and a distribution network operator (DNO) for a network of microgrids in consideration of multiple objectives. This is a high-level design and only those microgrids with nondispatchable renewable energy sources are considered. For a power grid in the network, the net value derived from providing power to the network must be maximized. By using a multiobjective approach, a fair scheme that does not advantage one particular objective can be attained. Simulations are provided to validate the proposed methodology.This talk performs an extensive review on control schemes and architectures applied to dc microgrids (MGs). It covers multilayer hierarchical control schemes, coordinated control strategies, plug-and-play operations, stability and active damping aspects, as well as nonlinear control algorithms. Islanding detection, protection, and MG clusters control are also briefly summarized. All the mentioned issues are discussed with the goal of providing control design guidelines for dc MGs. The future research challenges, from the authors point of view, are also provided in the final concluding part. In this presentation, the analysis and design of effective distributed control and state estimation schemes for multiple-microgrids are examined in details.
MagdiSadek Mahmoud has been a professor of engineering since 1984. He is now a Distinguished Professor at KFUPM, Saudi Arabia. He was on the faculty at different universities worldwide including Egypt (CU, AUC), Kuwait (KU), UAE (UAEU), UK (UMIST), USA (Pitt, Case Western), Singapore (Nanyang) and Australia (Adelaide). He lectured in Venezuela (Caracas), Germany (Hanover), UK ((Kent), USA (UoSA), Canada (Montreal) and China (BIT, Yanshan). He is the principal author of forty-six (46) books, inclusive book-chapters and the author/co-author of more than 600 peer-reviewed papers. He is the recipient of several prizes in science and engineering. He is currently actively engaged in teaching and research in the development of modern methodologies to distributed control and filtering, networked-control systems, renewable-energy systems and cyberphysical systems.