Power Flow Control of Micro Grid in Islanded Mode Operation

ABSTRACT This paper proposes the control strategy to improve the system operation performance. The proposed micro grid consists of a photovoltaic array, proton exchange membrane fuel cell and lithium ion storage battery. The battery is included in the micro grid to reduce the burden of the power generated by the micro grid during the peak period. An overall energy management system is also implemented for the micro grid to coordinate load sharing among different DG units during both grid-connected and islanded operation. The total system improves the controlling of power Quality and Reliability of the system that the micro grid is connected to. Kalman filters used to extract the harmonic component of the distorted source voltage and load current, and estimate the gain and THD. The simulation results shows that the functions of the Distributed Generation Units in the Micro Grid can be in corporate efficiently under the proposed controller to ensure the stable operation of the overall grid.