A Mathematical Model Based Approach to Evaluate System Efficiency/Performance of Intermittent DERs, Energy Storage, Multiple Load Classes Based Residential DC Multi-Micro Grids /

Abstract

Increasing DC load demand and after successful transmission of electric power through HVDC lines made cause to get attention of researchers towards distribution in DC instead of AC. DC power distribution has become a hot topic for research in recent past years, even though it has given up a long time ago. Researchers are making a number of research efforts for DC distribution field; especially the time, from when the idea of DC distribution for DC Microgrids has become significant research topic for researchers. System efficiency, still is one of the under- research areas of DC distribution and it is the one of the parameters, which is used to evaluate the system performance and from which we can have a strong argument for replacing the distribution system from AC to DC once. As the DC microgrid efficiency over the AC grid needs future investigation from smart grid perspective, the AC microgrid tools may not be remained applicable for DC microgrids and the spread of DC microgrid has expected to be prevailed. Therefore, there is a need to further address the aforementioned limitations with mathematical model to evaluate system efficiency for given parameters and scenarios. The mathematical modeling which is still missing in this research area, is the basic focus of the current study. therefore, this research work as proof of the concept is proposed to achieve a mathematical model consisting on 3D matrices based newly derived set of equations. The proposed model evaluates the system efficiency for worst, normal and best scenarios of DER embedded multi-class load based residential DC Microgrids (MGs) and Multi-Microgrids (MMGs). After that a comprehensive sensitivity analysis across various cases and respective scenarios is presented to evaluate overall system performance and impacts of system parameters on system efficiency have been shown in this research effort.