A novel method for the determination of dynamic resistance for photovoltaic modules

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• 作者：Jen-Cheng Wang¹ ; Jyh-Cherng Shieh¹ ; Yu-Li Su ; Kun-Chang Kuo ; Yen-Wei Chang ; Yu-Ting Liang ; Jui-Jen Chou ; Kuo-Chi Liao ; Joe-Air Jiang  ; ;   ; ^{jajiang@ntu.edu.tw}
• 关键词：Dynamic resistance ; Photovoltaic (PV) modules ; p-n junction semiconductor ; Direct resistance-estimation method
• 刊名：Energy
• 出版年：2011
• 出版时间：October 2011
• 年：2011
• 卷：36
• 期：10
• 页码：5968-5974
• 全文大小：793 K

文摘

Obtaining the maximum power output in real time is indispensable to the operation of grid connected photovoltaic (PV) power systems under given atmospheric conditions. Focusing on the resistance effect of the solar cells, we propose a new and simple method to directly determine the dynamic resistance of the PV modules from an irradiated current¨Cvoltage characteristic curve. In our method, we develop the ability to determine the dynamic resistance with a combination of finite series- and shunt-connected resistance. A series of experiments, including numerical simulations and field data tests, are conducted to examine the dynamic behavior of the PV modules during power tracking. Experimental results show that the proposed direct resistance-estimation method allows the PV modules to achieve their maximum power and impedance matching under various operation conditions.