Abstract:
Photovoltaic (PV) systems are often nonuniformly illuminated owing to shadows of neighboring buildings, trees, clouds, etc. In order to reduce the effect of shadows on so...Show MoreMetadata
Abstract:
Photovoltaic (PV) systems are often nonuniformly illuminated owing to shadows of neighboring buildings, trees, clouds, etc. In order to reduce the effect of shadows on solar panels, we propose the concept of a PV system with reconnection; this system consists of PV arrays that can be reconnected to minimize the mismatch loss, depending on the output of each of its module, measured at regular time intervals. In this study, the relationship between the output improvement with reconnection and the switching interval is shown. For a 3-kW PV system, under conditions of cloudlessness and cloudiness, a sharp difference in the output improvement relative to the switching interval is not observed. However, under the condition of shading, the output improvement sharply decreases relative to the switching interval; the output improvement at a 1-min switching interval is 0.15 kWh·h (+22.4%). For the 90-kW building-integrated photovoltaic system, during the summer solstice, a sharp difference in the output improvement relative to the switching interval is not observed. However, during the vernal equinox and winter solstice, when a large area of the PV system is shaded for a long period of time, the output improvement sharply decreases relative to the switching interval. The output improvement at a 1-min switching interval is 6.5 kWh·d (+2.9%) during the vernal equinox and 2.3 kWh·d (+3.7%) during winter solstice.
Published in: IEEE Journal of Photovoltaics ( Volume: 2, Issue: 3, July 2012)
University of Tsukuba, Ibaraki, Japan
Hideaki Obane (S'11) was born in Shizuoka, Japan, on October 29, 1987. He received the Bachelor's degree in engineering systems from the University of Tsukuba, Tsukuba, Ibaraki, Japan, in 2010, where he is currently working toward the Graduate degree in engineering with the Department of Risk Engineering, Graduate School of Systems and Information Engineering.
His research interests include solar cell technology and risk e...Show More
Hideaki Obane (S'11) was born in Shizuoka, Japan, on October 29, 1987. He received the Bachelor's degree in engineering systems from the University of Tsukuba, Tsukuba, Ibaraki, Japan, in 2010, where he is currently working toward the Graduate degree in engineering with the Department of Risk Engineering, Graduate School of Systems and Information Engineering.
His research interests include solar cell technology and risk e...View more
University of Tsukuba, Ibaraki, Japan
Keiichi Okajima (M'11) was born in Iwate, Japan, on May 14, 1968. He received the Ph.D. degree in chemical engineering from The University of Tokyo, Tokyo, Japan, in 1999.
During 1998–2005, he was a Research Associate with Shizuoka University, Shizuoka, Japan. He is currently a Lecturer with the University of Tsukuba, Tsukuba, Ibaraki, Japan. His research interests are the analysis of energy systems.
Dr. Okajima is a member...Show More
Keiichi Okajima (M'11) was born in Iwate, Japan, on May 14, 1968. He received the Ph.D. degree in chemical engineering from The University of Tokyo, Tokyo, Japan, in 1999.
During 1998–2005, he was a Research Associate with Shizuoka University, Shizuoka, Japan. He is currently a Lecturer with the University of Tsukuba, Tsukuba, Ibaraki, Japan. His research interests are the analysis of energy systems.
Dr. Okajima is a member...View more
National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan
Takashi Oozeki (M'10) received the B.S. degree in electrical engineering from the Nagoya Institute of Technology, Nagoya, Japan, in 2000 and the Master's and Ph.D. degrees in engineering from the Tokyo University of Agriculture and Technology, Tokyo, Japan, in 2002 and 2005, respectively.
Since 2005, he has been with the National Institute of Advanced Industrial Science and Technology, Ibaraki, Japan. His research interest...Show More
Takashi Oozeki (M'10) received the B.S. degree in electrical engineering from the Nagoya Institute of Technology, Nagoya, Japan, in 2000 and the Master's and Ph.D. degrees in engineering from the Tokyo University of Agriculture and Technology, Tokyo, Japan, in 2002 and 2005, respectively.
Since 2005, he has been with the National Institute of Advanced Industrial Science and Technology, Ibaraki, Japan. His research interest...View more
JX Nippon Oil and Energy Corporation, Yokohama, Kanagawa, Japan
Takafumi Ishii received the B.D. and M.D. degrees in chemistry from the University of Tokyo, Tokyo, Japan, in 1982 and 1984, respectively.
He is currently a Principal Specialist with JX Nippon Oil and Energy Corporation, Yokohama, Kanagawa, Japan. He worked since 1984 on petroleum refineries, since 1985 on the research and development of organic synthesis and polymer science, and since 2003 on the research and development ...Show More
Takafumi Ishii received the B.D. and M.D. degrees in chemistry from the University of Tokyo, Tokyo, Japan, in 1982 and 1984, respectively.
He is currently a Principal Specialist with JX Nippon Oil and Energy Corporation, Yokohama, Kanagawa, Japan. He worked since 1984 on petroleum refineries, since 1985 on the research and development of organic synthesis and polymer science, and since 2003 on the research and development ...View more
Contents University of Tsukuba, Ibaraki, Japan
Hideaki Obane (S'11) was born in Shizuoka, Japan, on October 29, 1987. He received the Bachelor's degree in engineering systems from the University of Tsukuba, Tsukuba, Ibaraki, Japan, in 2010, where he is currently working toward the Graduate degree in engineering with the Department of Risk Engineering, Graduate School of Systems and Information Engineering.
His research interests include solar cell technology and risk engineering.
Hideaki Obane (S'11) was born in Shizuoka, Japan, on October 29, 1987. He received the Bachelor's degree in engineering systems from the University of Tsukuba, Tsukuba, Ibaraki, Japan, in 2010, where he is currently working toward the Graduate degree in engineering with the Department of Risk Engineering, Graduate School of Systems and Information Engineering.
His research interests include solar cell technology and risk engineering.View more
University of Tsukuba, Ibaraki, Japan
Keiichi Okajima (M'11) was born in Iwate, Japan, on May 14, 1968. He received the Ph.D. degree in chemical engineering from The University of Tokyo, Tokyo, Japan, in 1999.
During 1998–2005, he was a Research Associate with Shizuoka University, Shizuoka, Japan. He is currently a Lecturer with the University of Tsukuba, Tsukuba, Ibaraki, Japan. His research interests are the analysis of energy systems.
Dr. Okajima is a member of the Japan Solar Energy Society, the Japan Society of Energy and Resources, the Society of Chemical Engineers Japan, and the Institute of Life Cycle Assessment Japan.
Keiichi Okajima (M'11) was born in Iwate, Japan, on May 14, 1968. He received the Ph.D. degree in chemical engineering from The University of Tokyo, Tokyo, Japan, in 1999.
During 1998–2005, he was a Research Associate with Shizuoka University, Shizuoka, Japan. He is currently a Lecturer with the University of Tsukuba, Tsukuba, Ibaraki, Japan. His research interests are the analysis of energy systems.
Dr. Okajima is a member of the Japan Solar Energy Society, the Japan Society of Energy and Resources, the Society of Chemical Engineers Japan, and the Institute of Life Cycle Assessment Japan.View more
National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan
Takashi Oozeki (M'10) received the B.S. degree in electrical engineering from the Nagoya Institute of Technology, Nagoya, Japan, in 2000 and the Master's and Ph.D. degrees in engineering from the Tokyo University of Agriculture and Technology, Tokyo, Japan, in 2002 and 2005, respectively.
Since 2005, he has been with the National Institute of Advanced Industrial Science and Technology, Ibaraki, Japan. His research interests include photovoltaic system's technologies, grid connection of the distributed generator, and solar energy.
Takashi Oozeki (M'10) received the B.S. degree in electrical engineering from the Nagoya Institute of Technology, Nagoya, Japan, in 2000 and the Master's and Ph.D. degrees in engineering from the Tokyo University of Agriculture and Technology, Tokyo, Japan, in 2002 and 2005, respectively.
Since 2005, he has been with the National Institute of Advanced Industrial Science and Technology, Ibaraki, Japan. His research interests include photovoltaic system's technologies, grid connection of the distributed generator, and solar energy.View more
JX Nippon Oil and Energy Corporation, Yokohama, Kanagawa, Japan
Takafumi Ishii received the B.D. and M.D. degrees in chemistry from the University of Tokyo, Tokyo, Japan, in 1982 and 1984, respectively.
He is currently a Principal Specialist with JX Nippon Oil and Energy Corporation, Yokohama, Kanagawa, Japan. He worked since 1984 on petroleum refineries, since 1985 on the research and development of organic synthesis and polymer science, and since 2003 on the research and development of energy systems. His current research interest is the development and demonstration of photovoltaic systems. His research interests also include methods of maximizing photovoltaic system yield, methods of detecting system faults, and combination systems with energy devices other than photovoltaics.
Takafumi Ishii received the B.D. and M.D. degrees in chemistry from the University of Tokyo, Tokyo, Japan, in 1982 and 1984, respectively.
He is currently a Principal Specialist with JX Nippon Oil and Energy Corporation, Yokohama, Kanagawa, Japan. He worked since 1984 on petroleum refineries, since 1985 on the research and development of organic synthesis and polymer science, and since 2003 on the research and development of energy systems. His current research interest is the development and demonstration of photovoltaic systems. His research interests also include methods of maximizing photovoltaic system yield, methods of detecting system faults, and combination systems with energy devices other than photovoltaics.View more
