局部阴影下光伏阵列建模及多峰值MPPT控制

MODEL OF PV ARRAY UNDER PARTIAL SHADING AND MPPT CONTROL OF MULTI-PEAK CHARACTERISTICS

针对实际应用中光伏阵列易受部分遮挡的情况,结合太阳电池的工程模型,推导出适用于复杂环境下的通用光伏阵列模型。考虑阴影条件下光伏阵列呈现多峰值输出特性,传统的最大功率点跟踪算法可能失效,提出了基于混合蛙跳算法(shuffled frog leaping algorithm,SFLA)的最大功率点跟踪算法。经仿真实验验证,该算法在静、动态阴影条件下均能快速准确跟踪全局最大功率点,可有效提高光伏阵列的输出功率。

According to the regular phenomenon of PV array under partial shading in actual application, a novel general PV array model which was suitable for complex environment was derived from the engineering model of solar cell. Because the conventional maximum power point tracking method could be ineffective under partially shaded condition, the multiple local maximum of the output characteristics for PV array would be exhibited. The multiple maximum power points tracking algorithm was put forward based on the shuffled frog leaping algorithm. The simulation results show that the proposed method can fast and accurately track the global maximum power point under static and dynamic partial shadings The output power of PV array can be improved effectively.