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中文摘要：
为了平抑光伏发电功率波动,并优化光伏出力特性,在运用小波包分解光伏波动频率特性的基础上,提出了基于2组电池组拓扑结构的电池储能系统（battery energy storage system,BESS）在线运行策略和双BESS的最优容量确定方法。模型中2组BESS工作状态分别为充电和放电状态,当某一电池组电能状态达到满充或满放时,则2组电池同时切换当前的工作状态。基于光伏发电厂实测数据,对所提方案进行了验证,结果表明,所提方案不仅在光伏出力特性上取得了较好的平抑效果,而且在电池特性上,由于采用双BESS,很大程度上降低了BESS充放电次数,提高了储能系统利用效率。
英文摘要：
To restrain the photovoltaic（ PV） power fluctuation and optimize the output characteristics of PV power,this paper proposes an on-line operation strategy for the battery energy storage system（ BESS） based on 2 groups of battery topology and the optimal capacity determination method for double BESSs,based on the wavelet packet decomposition of PV power fluctuation frequency characteristics. In the model,2 sets of BESS working states are charging and discharging states respectively. When any BESS arrives at their status of adequate charging or discharging,double BESSs switch their states at the same time. Based on the measured data of PV power plant,we verify the proposed scheme. The results show that the proposed scheme not only can have good restraining effect in PV power output characteristics,but also reduce battery charge and discharge times of BESS in the battery characteristics and improve the utilization efficiency of energy storage system because of using double BESSs.
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