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Compared with the traditional microgrid, a smart transformer (ST)-based microgrid shows advantages in terms of higher efficiency, increased hosting capacity, and enhanced reliability. However, this novel microgrid presents challenges because of the complex resonances within the system and the interactions between ST and power converter-based distributed energy resources (DERs). Both the ST and DERs...
An optimal control strategy devoted to manage the daily charging/discharging profiles of Energy Storage Systems (ESSs) is described in the present paper. The proposed approach aims to minimize Microgrids (MGs) daily electricity costs considering both the real-time price evolution and the effects of intermittent Renewable Energy Sources (RESs). Referring to MGs and electricity market modeling as well...
Rapid development of Distributed Energy Resources (DERs) and DC-powered loads entails the possibility of DC micro-grids to revenge conventional AC distribution networks. In addition, a continuous evolution of the power electronic technology allowing the highest possible power of DER production also makes the DC micro-grids more feasible in the near future. Although energy efficiency and steady state...
Frequency-based energy management strategies have been proposed for stand-alone systems with either centralized or distributed energy storage. This paper proposes a methodology for the design of the control parameters which ensures stability in both type of systems. As a result, the inverter manufacturer can implement one sole strategy, regardless of whether the expected stand-alone system is centralized...
This paper develops selective strategies for Neutral Point Clamped Multilevel Inverter (NPC) in a microgrid application with load current decomposition based on Synchronous Reference Frame (DQ) method. The 3-level NPC inverter is investigated as widely used topology for medium and high power applications. In addition to the current injection into the grid, the 3-level NPC DG inverter is also being...
Integration of renewable energy sources (RES) into the ac grid is growing very rapidly to meet the high and reliable load demand. The penetration of this growing microgrid structures within the distribution network are leading to several challenging power quality issues. It is mandatory to maintain the voltage and frequency within the prescribed limits at the local bus under any condition of the renewable...
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