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Takumi Takashima
National Institute of Advanced Industrial Science and Technology
70Publications
15H-index
719Citations
Publications 70
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#1Takumi Takashima (AIST: National Institute of Advanced Industrial Science and Technology)H-Index: 15
#2Kazuaki Ikeda (AIST: National Institute of Advanced Industrial Science and Technology)H-Index: 1
#1Takumi Takashima (AIST: National Institute of Advanced Industrial Science and Technology)H-Index: 15
Comparisons of indoor measurements under standard test conditions (STC) and outdoor measurements under actual operation conditions of ten-year-used interconnect-failed PV modules were described. In the indoor measurements under STC, no sample modules showed the output power degradation of more than 20% from the rated power. In the outdoor measurements of the sample modules, the open-circuit voltage decreased in a discrete value with a half volt of the rated open-circuit voltage when the module t...
ABSTRACTThe effect of air mass (AM) on the performance of multi-crystalline silicon (m-Si), amorphous silicon (a-Si), and hetero-junction with intrinsic thin layer (HIT)-technology-based photovoltaic (PV) modules are evaluated for representative day of four seasons during the year 2011 for composite climate of India. To find the best performing PV module technology with respect to AM at the site, annual energy yields and performance ratio against different AM bands (AM 1–4.5) are plotted. It is ...
#1Hideaki Ohtake (AIST: National Institute of Advanced Industrial Science and Technology)H-Index: 7
#2Takumi Takashima (AIST: National Institute of Advanced Industrial Science and Technology)H-Index: 15
Last.Yoshinori Yamada (JMA: Japan Meteorological Agency)H-Index: 9
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Photovoltaic (PV) power generation is directly effected by global horizontal irradiance (GHI) and has also large variations in spatial and/or temporal scales. For a safety control of an energy management system (EMS), a day-ahead forecast or several hour forecast of solar irradiance by a numerical weather prediction model (NWP) becomes important for a control of reserve capacity (thermal power generation, etc.). In particular, a large forecast error of PV power and/or GHI forecasts has to be pre...
#1Joao Gari da Silva Fonseca Junior (AIST: National Institute of Advanced Industrial Science and Technology)H-Index: 5
#2Takashi Oozeki (AIST: National Institute of Advanced Industrial Science and Technology)H-Index: 12
Last.Kazuhiko Ogimoto (UTokyo: University of Tokyo)H-Index: 14
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The development of methods to forecast photovoltaic (PV) power generation regionally is of utmost importance to support the spread of such power systems in current power grids. The objective of this study is to propose and to evaluate methods to forecast regional PV power 1 day ahead of time and to compare their performances. Four forecast methods were regarded, of which two are new ones proposed in this study. Together, they characterize a set of forecast methods that can be applied in differen...
#1Hideaki Ohtake (AIST: National Institute of Advanced Industrial Science and Technology)H-Index: 7
#2Joao Gari da Silva Fonseca (AIST: National Institute of Advanced Industrial Science and Technology)H-Index: 6
Last.Yoshinori Yamada (JMA: Japan Meteorological Agency)H-Index: 9
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Abstract To obtain accurate forecasts of photovoltaic power generation, the use of forecast datasets of meteorological elements from numerical prediction models, specifically global horizontal irradiance (GHI), is necessary. This study seeks to validate, and therefore improve GHI forecasts. Ground-based data from Japan Meteorological Agency (JMA) stations are used in a JMA mesoscale model (MSM) during the time period from 2008 to 2012 and temporal and spatial characteristics of forecast errors a...
The objective of this study is to propose a method to calculate prediction intervals for oneday-ahead hourly forecasts of photovoltaic power generation and to evaluate its performance. One year of data of two systems, representing contrasting examples of forecast’ accuracy, were used. The method is based on the maximum likelihood estimation, the similarity between the input data of future and past forecasts of photovoltaic power, and on an assumption about the distribution of the error of the fo...
#1Ken-ichi ShimoseH-Index: 4
#2Hideaki Ohtake (AIST: National Institute of Advanced Industrial Science and Technology)H-Index: 7
Last.Yoshinori Yamada (JMA: Japan Meteorological Agency)H-Index: 9
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The impact of aerosols on the forecast accuracy of solar irradiance calculated by a fine-scale, one day-ahead, and operational numerical weather prediction model (NWP) is investigated in this study. In order to investigate the impact of aerosols only, the clear sky period is chosen, which is defined as when there are no clouds in the observation data and in the forecast data at the same time. The evaluation of the forecast accuracy of the solar irradiance is done at a single observation point th...
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