Stability and reliability of low voltage hybrid AC-DC microgrids power flow model in islanding operation

Abstract

The problem of decreasing and increasing power flow in hybrid AC-DC microgrids in islanding operations is the concern of this study. This condition arises if one sub-microgrid cannot supply load power requirements, either because of a decrease in power at the source or an increase in load on the sub-microgrid network. The result, in this study using a bidirectional converter as an interlinking converter, the converter can change the power flow from ac sub microgrid to dc sub microgrid and vice versa. With this converter, load requirements can be met despite a lack of power in one of the sub microgrids. The simulations in this study are supported by Simulink / Matlab software. This model is built in a low voltage system, and power flow analysis is in steady state with two different cases. Simulation results show the stability and reliability of power flow in both sub microgrids with stable frequency and voltage when power and load changes occur.