摘要
光伏阵列在受到阴影遮挡时,功率曲线会存在多个峰值点,传统的单峰最大功率点追踪(Maximum Power Point Tracking,MPPT)方法会陷入局部极大值而失效,针对此问题提出一种新型自适应变步长扰动观测(Perturbation and Observation,P&O)算法,在可能出现局部峰值点的设定小范围内运行自适应变步长P&O算法追踪局部峰值点,依次跳跃搜索并保留较大功率值,从而实现全局最大功率点的追踪.该算法能捕捉任何一个局部峰值点,准确性高,收敛稳定,搜索范围减小,追踪时间缩短.经MATLAB仿真结果表明该算法可快速准确地追踪到任意阴影条件下光伏阵列的全局最大功率点.
When photovoltaic arrays are shaded,there will be multiple peaks in the power curve.The traditional single peak power point tracking(MPPT)method will fall into local maximum and fail.To solve this problem,a new adaptive variable step size P&O algorithm is proposed.The adaptive variable step size P&O algorithm is used to track the local peak point in a small range where the local peak point may occur.The algorithm searches for the local peak point in turn and retains the larger power value,thus realizing the global maximum power point tracking.The algorithm can capture any local peak with high accuracy,stable convergence,reduced search range and shortened tracking time.MATLAB simulation results show that the algorithm can quickly and accurately track the global maximum power point of photovoltaic arrays under arbitrary shadows.
作者
康家玉
曹举
刘甲琛
王素娥
KANG Jia-yu;CAO Ju;LIU Jia-chen;WANG Su-e(College of Electrical and Information Engineering,Shaanxi University of Science&Technology,Xi′an 710021,China;State Grid Xi′an City Changan Electric Power Supply Company,Xi′an 710100,China)
出处
《陕西科技大学学报》
CAS
2019年第2期150-155,共6页
Journal of Shaanxi University of Science & Technology
基金
西安市科技计划项目(2017068CG/RC031(SXKD009))
关键词
光伏阵列
阴影遮挡
多峰值P-V曲线
新型自适应变步长P&O算法
开路电压
全局最大功率点追踪
photovoltaic array
shadow occlusion
multi peak P-V curve
new adaptive variable step size P&O algorithm
open circuit voltage
global maximum power point tracking
