Dynamic Modeling and Performance Analysis of an Autonomous and Non-autonomous Microgrid

Abstract

A microgrid system with a power system grid connection is advantageous because it can depend on the power grid when additional power is needed. Alternatively, it can also feed the grid with its excess generation. This paper looks into the dynamic behaviour of a microgrid when it switches from non-autonomous to autonomous mode. A 28th-order nonlinear dynamic model of a PV-wind-microalternator-STATCOM integrated microgrid system has been developed. The performance of the system has been evaluated by solving the state equations through the MATLAB ode program. The effect of temporary and permanent faults in the system network has been investigated. Simulation results suggest that the proposed model can effectively operate in non-autonomous mode until a severe disturbance is encountered in the main grid. It also shows its capability of switching to the autonomous mode once the disturbance is found to be severe or if it persists for a longer time.