Design and Control of Hybrid AC/DC Microgrids for Renewable Energy Distribution

Abstract

Hybrid AC/DC microgrids have been attracting a lot of interest as a viable system of combining renewable energy sources and varying loads. Nonetheless, the nature of the intermittency of renewable generation and the dynamic characteristic of AC-DC subsystems offers serious challenges towards stabilising the system and ensuring the quality of power and coordinated energy flow. In this paper, I give the design and control of a hybrid AC/DC microgrid structure with photovoltaic (PV) generation, battery energy storage systems (BESS) and bidirectional power converters. To develop efficient power sharing and voltage/frequency regulation in dynamic operating conditions, a coordinated control framework is suggested, which is a combination of droop-based decentralised control and centralised energy management strategy. A small-signal hypothesis of the system is created to examine structural conducts of stability and a judgement of the eigenvalues establish enhanced damping action. The suggested solution is tested by using simulation on MATLAB/Simulink simulations in various conditions, such as loads variations and renewable generation variability. It has been proved that there was a decrease of 8 to 3 percent voltages deviation, 0.6 Hz to 0.2 Hz frequency deviation, and improvement of settling time by about half over control using conventional techniques. The results show that the suggested framework is effective in the context of improving the reliability of the system and efficiency of distribution of energy at the level of hybrid microgrids.