Performance Evaluation of a Control Strategy Developed for a Hybrid Energy System Integrated in DC-AC Microgrids

摘要

Renewable energy is a promising technology to meet the future electricity demand of any country. However, output power produced by renewable energy sources varies intermittently according to the climatic conditions. Hence, interconnection of these renewable energy sources as hybrid energy system is a complicated task. In this article, a DC-AC microgrid structure is proposed to integrate different voltage-current characteristic renewable sources, storage units, local loads, and utility grids. A control strategy is proposed for the effective microgrid power management under grid connected and isolated modes. The proposed control strategy performs (1) prediction of the output power developed by the intermittent nature of renewable energy sources, (2) control of the primary sources, storage unit and utility grid, and (3) schedule loads on priority basis. Simulation studies have been carried out for the performance evaluation of the control strategy developed for the microgrid structure and the results are presented in this article.