Abdelsalam M. Elmakawi

Using a hybrid renewable energy source with an energy storage system, this paper proposed a novel multi-stage non-isolated three-port converter with a 5H inverter to feed a residential load varying from 50 Watts to 3500 Watts. The proposed three-port converter operates in grid-tied and standalone power modes. A novel demand-side management algorithm, which covers eight operation modes, is described. Additionally, a complete control system is discussed. The proposed control system controls the PV maximum power point and battery charging/discharging, and regulates the 400 V DC bus voltage, the load voltage in standalone mode, and the grid-tied injected current. The proposed converter and the control system are validated through simulation for all power modes. The simulation results reveal that the proposed system is viable for Building-Integrated PV Systems.

To meet the increase in electrical energy demand and to reduce CO2 emissions from conventional power plants, Building Integrated Photo-Voltaic (BIPV) systems are gaining more attention. High gain DC-DC converters are essential to utilize the power generated from renewable energy sources and play a significant role in the overall renewable generation system performance. In this paper, a novel single-switch non-isolated dc-dc converter with a high step-up voltage gain, reduced voltage stress, and low input current ripple is developed. These features make the proposed converter suitable for renewable energy sources. The principle of operation, theoretical analysis, elements design, simulation by PSIM, and techno-economic study are presented.

Using renewable energy sources (RESs) and energy storage system (ESS) in micro-grids are becoming popular and attracting more researchers to make it safe and efficient with minimum cost. Multi-Port Inverters (MPIs) are used to integrate renewable energy sources and energy storage system with load and utility, to deal with the power operation modes and to provide the maximum power point. Recently, many Multi-Port inverters typologies have been proposed and reported in the literature. This paper provides a review of various non-isolated Multi-Port power topologies used for renewable energies applications. These topologies are compared based on their number and types of DC sources, passive elements, and the control strategy for DC and AC ports. Also, a novel classification of Multi-Port power topologies is presented. This review paper is the first of its kind with the aim of providing information of the complete conversion system for renewable energy sources, also, this work helps the researchers, designers and application engineers to now the trends in this filed.

In order to assess DC-DC power electronic converters for a specific application, several comparison aspects are used, such as efficiency, ripple current, gain, number of elements and element stress. Also, various graphs are presented in articles as comparative tools. On the other hand, losses energy cost is an important assessment factor that does not have specific indices. These traditional comparison aspects and graphs do not give a clear vision to compare converters under variable load conditions. This work aims to create qualitative criteria based on the techno-economic concept to compare and assess power electronic converters operating under variable load conditions for building integrated photovoltaic system. Simulation of four different high gain DC-DC converter has been simulated by PSIM, and the results are analyzed for Turkish and Australian residential load profile cases.