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Global MPPT Control for Grid-Connected PV System under Partially Shaded Condition
Author(s): WAN Xiao-feng, HU Wei, YU Yun-jun, HU Hai-lin
Pages: 378-
382,432
Year: 2016
Issue:
2
Journal: Computer Simulation
Keyword: Grid-connected PV system; Photovoltaic array; Multiple peaks characteristic; Ant colony algorithm; Perturbation and observation method; MPPT;
Abstract: 遮蔽条件下的光伏并网系统其功率输出曲线呈现出多峰特性,采用常规的算法跟踪阵列的最大功率点很可能陷入局部极值点而不能跟踪到全局最大功率点,针对此问题,提出一种基于蚁群算法和扰动观察法跟踪全局最大功率点的方法.采用蚁群算法搜索阵列的全局最大功率点对应的电压并通过并网控制系统的电压外环控制其稳定,在此基础上采用小步长的扰动观察法提高跟踪的准确度.通过Simulink建立光伏并网系统的仿真模型,结果表明,在遮蔽条件下,可以快速准确地跟踪到光伏并网系统的全局最大功率点,提高了光伏阵列的输出功率.
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