光伏能源高效利用研究

Research on efficient utilization of photovoltaic energy

光伏发电大规模并网给电网的稳定运行带来巨大挑战,光伏发电系统功率输出具有非线性、间接波动性和不确定性等特点,在未来光伏发电一体化程度极高的电力系统中,不仅要在不出现电力短缺的情况下保持供需平衡,还要尽可能多地利用光伏能源,光伏功率预测和储能装置在电力系统运行中的应用就是必不可少的一环。提出了一种基于光伏功率预测来确定和修改电池储能系统充放电时间表和热发电机组组合的方法,通过数值模拟对所提出的方法进行了评估。结果表明,该方法可以减少能量不足和光伏消减问题。

Large-scale grid-connected photovoltaic power generation brings great challenges to stable operation of power grid.The power output of photovoltaic power generation system has characteristics of nonlinear,indirect volatility and uncertainty.In the future power system with high degree of integration of photovoltaic power generation,not only balance between supply and demand should be maintained without power shortage,but also photovoltaic energy should be used as much as possible.Therefore,application of photovoltaic power prediction and energy storage devices in power system operation is an essential part.In this paper,a method based on photovoltaic power prediction is proposed to determine and modify charging and discharging schedule of battery energy storage system and combination of thermal power units.The proposed method is evaluated by a year of numerical simulation.The results show that this method can reduce the problems of insufficient energy and photovoltaic reduction.