Quantitative analysis of output loss due to restriction for grid-connected PV systems

Autor: Masaharu Yokota, Kiyoyuki Kitamura, Hiroyuki Sugihara, Kosuke Kurokawa, Yuzuru Ueda, Takamitsu Itou, Yusuke Miyamoto, Takashi Oozeki
Rok vydání: 2006
Předmět:
Zdroj: Electrical Engineering in Japan. 158:9-19
ISSN: 1520-6416
0424-7760
DOI: 10.1002/eej.20452
Popis: The voltage of power distribution lines will be increased due to reverse power flow from grid-connected PV systems. In the case of high-density grid connection, the voltage increase will be higher than in a stand-alone grid connection system. To prevent overvoltage on the power distribution lines, the PV system's output will be restricted if the voltage of the power distribution line is close to the upper limit of the control range. Because of this interaction, the output loss will be larger in the high-density case. This research has developed a quantitative analysis method for PV system output and losses in order to clarify the behavior of grid-connected PV systems. All the measured data are classified into loss factors using a 1-minute average of 1-second data instead of the typical 1-hour average. The operation point on the I–V curve is estimated to quantify the loss due to the output restriction, using the module temperature, array output voltage, array output current, and solar irradiance. As a result, the loss due to output restriction is successfully quantified and the behavior of output restriction is clarified. © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 158(2): 9–19, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20452
Databáze: OpenAIRE
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