ing at the problem that the energy storage station has a single operation mode under the existing configuration and cannot fully utilize the energy storage function, this paper presented a novel control strategy which combines smoothing photovoltaic fluctuation mode and peak-valley electricity price arbitrage mode. For the mode of smoothing photovoltaic fluctuation, the internal power of the energy storage system is initially allocated by wavelet packet decomposition, and then combined with the state of charge of the energy storage device, the primary power is adjusted to realize power redistribution. For the mode of peak-valley electricity price arbitrage, according to the time-of-use price and state of battery charge information, the charging and discharging start and stop time of the energy storage system is determined, and then the charging and discharging power is determined according to the actual size of the load to realize the economic operation of the power load. According to the real-time fluctuation of PV, combined with the state of charge of the energy storage device, a coordinated operation strategy of two operating modes was designed to realize the reasonable management of source/network/load/storage energy. Finally, a simulation model was built in Matlab to verify the accuracy and practicability of the proposed control strategies, and then applied those strategies to the demonstration project.
KEY WORDS :smoothing power fluctuation;peak-valley electricity arbitrage;state of charge;power distribution;multi-mode coordinated operation;
图2
混合储能系统控制原理
Fig. 2
The control principle of hybrid energy storage system
首先,信息与数据系统电力数据采集与监控(supervisory control and data acquisition,SCADA)实时采集光伏电站实测数据Ppv和负荷数据Pload。光伏超短期功率预测模型根据实测历史数据对光伏电站进行超短期功率预测,记为Ppvf,时长尺度为1h,为了提高预测精准性,每隔15min对预测数据刷新一次[8]。
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