Abstract
Renewable energy power generation represented by wind power and photovoltaic power is intractable,which brings great challenge to safe operation of micro-grid. Designing energy storage system is an effective solution. This paper mainly researches how to obtain the energy storage capacity when the micro-grid is in island state, and put forward a method for determining the optimal storage capacity with probabilistic method based on statistics. According to the probability density function curve both the maximum charging and discharging power and the optimal capacity of energy storage system are calculated which can improve the economic benefit and renewable energy utilization.
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