基于混合储能的光伏波动功率平抑方法研究

针对光伏发电系统中发电功率波动问题，构建了一种基于混合储能的光伏并网发电系统模型，以平抑并网功率的波动。该模型引入了由超级电容器和蓄电池组成的混合储能系统，可以有效应对在各种天气条件下所引起的光伏输出功率波动问题，从而对并网功率进行削峰填谷。同时，对现有的MPPT法进行相应改进，提出了单向变步长追踪法，能够更加稳定且迅速地调整光伏系统的最大输出功率，提高发电效率。最后，在Matlab/Simulink上进行仿真，结果表明该混合储能控制系统能够有效提高光伏并网功率输送的稳定性能。

Research on the method for balancing fluctuant PV power based on hybrid energy storage system

Aiming at the question of balancing the fluctuating photovoltaic grid-connected generation system, a hybrid energy storage-based grid-connected PV power system model is proposed to overcome the fluctuation of grid-injected power caused by the change of illumination intensity and temperature. An ultracapacitor-battery based energy storage control system is employed to smooth the fluctuation of grid-injected power caused by the change of various weather conditions. A new method to track the maximum power point is proposed to modulate the maximum output power of PV system more stably and instantly, and it can also improve the power generation efficiency. Finally, this model is tested by using Matlab/Simulink. The result proves that the hybrid energy storage-based control system can efficiently improve the stability of PV grid-injected power.