Equivalent model parameter estimation of grid-connected fuel cell-based microgrid

Simulation of the power grid including numerous microgrids (MGs) with complex and detailed model (DM) is very time-consuming. Nevertheless, these kinds of simulations are vital for power engineers and utilities to analyze the impact of dynamic interconnections among MGs and the power grid. In this paper, an electrical equivalent model (EM) including electrical components, such as an equivalent solid oxide fuel cell (SOFC) model, voltage source converter (VSC), and static load, is proposed for a fuel cell-based MG. The parameters of the EM are estimated to behave similar to the DM of the MG in different scenarios and operating points. The parameter estimation procedure is conducted using genetic algorithm. The IEEE 9-Bus transmission system is considered as the main grid, while the IEEE 33-Bus distribution system is considered as the grid-connected MG. Three SOFCs of different size and dynamic parameters are connected through VSCs to the MG. Different scenarios of active and reactive power changes are simulated, and results of the EM and DM are compared, to demonstrate the accuracy of the determined EM.