Abstract—The fluctuation of Photovoltaic (PV) generation brings significant impact on power systems. To reduce such impact, this paper proposed a power and capacity configuration method for hybrid energy storage systems (EES) considering the confidence level of PV output fluctuation. The spectral analysis and lowpass filtering (LPF) methods are combined, and according to the spectral analysis results of PV output, the optimized second-order LPF time constant is determined by considering the confidence level of fluctuation rate, integrated power fluctuation constraints, charging and discharging power balance constraints, charging-discharging efficiency of energy storage equipment and the state of charge. Then the output of hybrid PV-ESS and the charging and discharging power and capacity of each components of the hybrid energy storage system that satisfies the power fluctuation demand can be calculated. Simulation is carried out using Matlab to validate the effectiveness of the algorithm on smoothing PV output fluctuation.
Index Terms—Hybrid energy storage, fluctuation rate, spectral analysis, lowpass filtering, charging and discharging power balance.
Jin Zong, Kai Bai, and Zhi Li are with State Grid Jibei Electric Power Co., Ltd Research Institute, China (e-mail: hyacinthzj@126.com, baikai1234@263.net, lizhi18688575@126.com).
Bo Yuan is with State Grid Energy Research Institute, China (e-mail: yuanbo@sgeri.sgcc.com.cn).
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Cite:Jin Zong, Kai Bai, Bo Yuan, and Zhi Li, "The Power Output and Capacity Configuration Method of Hybrid Energy Storage Systems Considering the Confidence Level of PV Fluctuation," Journal of Clean Energy Technologies vol. 5, no. 3, pp. 212-216, 2017.
