摘要
要提高光伏发电系统的输出效率,必须要有高效的最大功率跟踪(MPPT)方法.文中通过理论分析与仿真研究,发现同一块太阳能电池在相同的温度和照度、不同的二极管品质因子和反向饱和电流下,输出的光生电流是相等的.根据这一结论提出了一种与天气状况相匹配的变电压最大功率跟踪(MPPT)算法.该算法利用爬山法(PO)求取实际的二极管品质因子和反向饱和电流,然后停用该法,通过综合补偿准确跟踪到实际的最大功率点.最后,结合变化的天气情况,验证了该算法的正确性与有效性.
It is necessary to develop an efficient maximum power point tracking （MPPT） method to improve the output efficiency of a photovohaic （PV） system. In this paper, some theoretical analyses and simulations are performed. It is found that the output photocurrent of the same piece of solar cell remains constant when the tempera- ture and irradiation are the same and when the diode quality factors and reverse saturation currents are different. Based on this conclusion, a variable-voltage MPPT algorithm that tracks the maximum power point in different weather conditions is proposed. In the proposed algorithm, the combined perturb and observe （PO） method is used to acquire the actual diode quality factor and reverse saturation current, and a comprehensive compensation without the PO method is employed to track the actual maximum power point. The correctness and effectiveness of the pro- posed algorithm are finally verified in different weather conditions.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第2期140-146,共7页
Journal of South China University of Technology(Natural Science Edition)
基金
教育部留学回国科研基金资助项目(教外司[2007]1108号)
上海市白玉兰科技人才基金资助项目(2007B073)
中国博士后基金资助项目(2005038435)
关键词
光伏系统
可再生能源
最大功率跟踪
光生电流
二极管品质因子
反向饱和电流
photovoltaic system
renewable energy
maximum power point tracking
photocurrent
Diode factor
reverse saturation current
