不同条件下的光伏发电系统功率控制策略研究

Research on Power Control Strategy of the Photovoltaic Power Generation System under Different Conditions

在大规模光伏发电的情况下,光能转化为电能效率的高低直接影响光伏发电能力。不同的环境条件下,光伏发电的能力也不同,考虑温度和光强的影响,探究出不同的最大功率点,根据环境条件的变化,采用不同的控制策略,保证始终处于最大功率点。利用MTALAB构建光伏发电系统仿真模型,模拟日照强度、温度对光伏电池特性的影响,对DC/AC变换器和MPPT的控制进行仿真,仿真结果与理论分析相吻合。

In the case of large-scale photovoltaic power generation,the conversion of light energy into electrical energy efficiency directly affects photovoltaic power generation capacity.Under different environmental conditions,the ability of photovoltaic power generation is also different.Considering the influence of temperature and light intensity,different maximum power points are explored.According to the changes of environmental conditions,different control strategies are adopted to ensure that they are always at the maximum power point.The simulation model of photovoltaic power generation system was constructed by MTALAB,and the influence of sunshine intensity and temperature on the characteristics of photovoltaic cells was simulated.The control of DC/DC converter,DC/AC converter and MPPT was simulated.The simulation results were in agreement with the theoretical analysis.