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Grid Friendly Operation of a PV-Storage System with Profit Maximization and Reliability Enhancement

The intermittent character of renewable energy sources (RES) creates market potentials for the emerging energy storage technologies. Energy storage systems can be utilized to support the grid, compensate the intense variation of RES production, and create opportunities for prosumers to maximize their profit under a variable electricity pricing scheme. In this paper, an optimal scheduling method is designed for a hybrid photovoltaic-storage system in a non-residential building. The scheduling scheme defines the utilization of a flywheel based storage device to minimize the cost of the electricity bill and simultaneously reduces the peak power exchange with the grid for a smooth power interaction. Further, the method considers the lifetime extension of the hybrid system grid-tied inverter by limiting the maximum output power of the inverter, without any energy shedding of solar power. The proposed optimization problem is solved for the day ahead using predicted input data. Several case studies are examined and useful results are obtained according to the profit and the grid interaction of the prosumer.