The DC/DC/AC bidirectional converter for direct power transmission idependent or on grid flexibly for AC microgrid

Abstract

The work of this paper is based on the development of microgrids in remote areas, islands and areas often affected by natural disasters in Vietnam and also in island countries in Asia. Multi-function DC/DC/AC converters work in conjunction with Boost converters and H-bridge circuits with four basic components: renewable energy sources; storage systems, DC, AC loads and AC grids to provide energy conversion processes that ensure efficient use of energy from distributed energy sources (renewable energy) and can work on the grid or independently and have many flexible energy conversion functions in microgrid systems. Distributed energy sources affect the parameters of the power supply grid due to changes in the parameters of the power source and especially sudden changes during the process of supplying energy to the AC and DC microgrids in the power system. In addition, the energy variation of the load on the DC and AC microgrids also affects the optimal use of energy from distributed energy sources. The proposed power circuit solution demonstrates significant efficiency improvements, especially in handling situations involving switching operating cases and recalibrating parameters to best suit the overall converter. In simulations and experiments, the superiority of the proposed solution is confirmed through performance comparisons between simulations, experiments, and references, as well as impact analyzes of different cases.