Sensitivity Analysis of the Capacity of Battery and Photovoltaic Generation and Contracted Demand of Purchased Power in a Microgrid

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The microgrid concept is being seriously considered as a solution to growing electricity demand. And to increase renewable energy near the demand side, a microgrid that utilizes controllable prime movers such as gas engines to compensate fluctuating demand and output of renewable energy is proposed here. We model the optimal operation planning of a microgrid system for the day ahead based on 30-minute demand data, and we conduct the sensitivity analysis of the battery capacity, contracted electric power demand from a utility grid, and PV capacity on costs. It is effective for annual cost reduction to make the contracted demand as small as possible. And the benefit of combination of PV and gas engine can be gained the most in the case that PV capacity is between 20% and 30% of the peak demand of the microgrid.

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