control and improvement of power quality in hybrid three-terminal ac/dc microgrids

Nowadays, the use of renewable energy sources has gained more attention due to their lower pollution ‎and cost compared to traditional fossil fuel generators. microgrid (mg) structures are used for better ‎management of these resources. this article focuses on power control in three-terminal ac/dc hybrid ‎mgs. for this purpose, a network backup converter is used to improve power sharing and reduce power ‎quality disturbances. the components of the mg include distributed generation units, ac loads, dc ‎loads, energy storage system (battery), and parallel connecting converters. in the studied topology of ‎ac/dc hybrid mg in this article, there are two main converters: a grid-forming converter that acts as ‎an intermediary converter and is used to control the mg voltage, and a vsc converter that is located ‎between the dc link (including the dc mg and battery) and the ac mg. in this article, a control ‎system is implemented for a hybrid mg and simulations are performed in matlab software for ‎four different scenarios related to active and reactive power of the mg and loads. simulation results ‎show that the energy management system and power control in the ac/dc hybrid mg have reduced ‎harmonics and improved system reliability in the mg.