Intelligent Bi-Directional AC-DC-AC Power Converter Control for Hybrid AC/DC Power Sharing in DC Microgrids Applications.

Some of the connectivity issues between DC microgrids and the main grid are looked into in this study. A prototype system has been developed and put into use to solve these issues. The system discussed here depends primarily on renewable energy sources. As a result, particular consideration was paid to handling these sources when designing the system's many components. To ensure effective source integration, the system needed to maintain several attributes, such as reliable and efficient load-feeding capabilities and complete control over voltage and power flow among the system's multiple buses. A fully regulated rectifier has been constructed to connect the DC grid with the AC grid as the first of two distinct converters that have been studied. The developed rectifier can control the active and reactive power drawn from the grid independently and can maintain a constant output voltage thanks to the use of the vector decoupling controlled sinusoidal pulse width modulation (SPWM) approach. As a result, this controlled rectifier serves as a voltage regulator for the DC microgrid and can act as a slack bus for the DC microgrid while achieving the power balance among its terminals. In addition, an other bi-directional AC-DC/DC-AC converter has also been developed to enable bidirectional power flow. While operating at unity power factor, the bi-directional AC-DC/DC-AC converter regulates the active power transferred from the DC grid to the AC grid. Additionally, it maintains a unity power factor while controlling active power transferred from the AC grid to the DC grid. Results from simulations show that the proposed system is valid.