Energy Management System Thesis

Energy Management System Thesis-7
Furthermore, the chapter leads to the microgrids development in terms of operation and efficiency by achieving an Energy Management System designed for a small mixed microgrid with separate AC and DC rings bidirectionally interconnected by static converters.For the last couple of years, a new solution suitable to local energy distribution within existing power systems has been proposed and developed: microgrids [1].Also, the MATLAB environment was used by introducing MATLAB scripts within the developed visual instruments (VI) diagrams.

Furthermore, the chapter leads to the microgrids development in terms of operation and efficiency by achieving an Energy Management System designed for a small mixed microgrid with separate AC and DC rings bidirectionally interconnected by static converters.

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The standard energy consumers, which can be considered by the conceptual microgrid model, include, but are not limited to general lighting, local electrical heating and general electrical outlets.

The critical consumers include the following essential services and equipment: technological processes that induce unacceptable interruption costs, safety lighting, or alarm and safety systems [7].

This additional simulation was necessary given that photovoltaic panels are characterized by an optimization point which provides maximum power.

This point generally varies according to the ambient environmental conditions.

When compared to conventional power systems, the main advantage of microgrids consists of the controllable unit feature.

Microgrids can be operated as a single load, ensuring easy control and compliance to rules and regulations without impacting the reliability and safety of the user’s power supply.The two microgrid definitions, which are currently in use, are provided by the US Department of Energy Microgrid Exchange Group and by CIGRÉ C6.22 Working Group, Microgrid Evolution Roadmap, respectively:“A microgrid is a group of interconnected loads and distributed energy resources within clearly defined electrical boundaries that acts as a single controllable entity with respect to the grid.A microgrid can connect and disconnect from the grid to enable it to operate in both grid-connected or island-mode”“Microgrids are electricity distribution systems containing loads and distributed energy resources, (such as distributed generators, storage devices, or controllable loads) that can be operated in a controlled, coordinated way either while connected to the main power network or while islanded”The microgrid concept supports an alternative approach to the integration of distributed energy resources characterized by low installed capacity to distribution grids [4].The main objective of the Energy Management System is to ensure the rational use of energy, while minimizing its costs.The secondary objectives relate to increasing energy efficiency and reducing energy consumption, but especially to assuring the power facilities security.Microgrids are designed to operate semi-independently, usually in grid-connected mode, providing options for isolated or islanded operation, either for economic, reliability, or security reasons.Also, the development of new energy sources as well as their integration within microgrids allows the supply of some isolated locations, such as islands or mountain areas, which are not connected to conventional power systems.Currently, a typical microgrid configuration, Figure 1, consists of an open architecture, including electrical, communication, command, and control components, which allow the users and energy sources interconnection.Thanks to the capability of offering higher levels for power quality and reliability, a large number of users will adopt power supply solutions based on advanced technology and power electronics in order to minimize voltage sags, interruptions and other voltage fluctuations, or other power-quality disturbances.The MPPT algorithm was implemented by measuring the electrical current for several voltage values at the required time interval.This method removes any possibility for the system to enter an unstable oscillation mode (sometimes affecting other types of algorithms).

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