Abstract
Some MW-class PV power stations are now under construction and more PV power stations will be introduced in future. However, the penetration of PV power station may disturb a stable operation of the power system. The largest concerns are frequency variation and voltage variation caused by fluctuation of PV power station output. When these variations can not be eliminated by the conventional system operation and control schemes, installation of energy storage system might be needed. From this background, the authors have developed control method of battery system for fluctuation suppression of PV power station output. In this paper, battery capacity needed to satisfy the required fluctuation suppression level is estimated. In the estimation, two types of suppression control schemes; one can save the required power capacity and another can save energy capacity.
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