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A Suitable Method of Energy Storage Capacity Optimization Based on DFT for BIPV

Building Integrated with Photovotaic (BIPV) will become an effective way of building energy efficiency. A capacity determination method of energy storage system based on spectral analysis for BIPV was presented. To take both the isolated operation and grid-connected operation into account, the energy storage capacity can be determined based on spectrum analysis results of the control power to smooth power fluctuations in microgrid. Results indicate that the power control target of tie-line in microgrid can be achieved and the power fluctuations of BIPV output power and load power can be effectively smoothed by a relatively small capacity of energy storage system determined by the presented method.