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4 Types of Foundations Adopted for 15MW Solar Plant (page 2)

All possible measures taken for water discharge using permeable anti-weed sheets

2016/02/11 17:51
Shinichi Kato, Nikkei BP CleanTech Institute
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Facility layout optimized by modifying the initial plan

Fig. 2: The initial installation plan was altered and optimized with minimum development of the land. Mortar was even used in some areas to prevent landslides. (source: Nikkei BP)

The engineering and construction required special measures that could only be applied to a golf course in the mountains. There were almost no flat areas while the direction, undulations and angles of the terrain varied in the site. Some areas were affected by the shadows of trees.

In terms of not only solar panels but also PV inverters, intermediate step-up transformers, and switches and cubicle for grid connection with the extra-high voltage power transmission line, the Daiwa Group gradually altered the initial plan for each facility and optimized their installation in light of the actual geographic circumstances (Fig. 2).

Sharp Corp and Toshiba Mitsubishi-Electric Industrial Systems Corp (TMEIC) supplied 60,088 solar panels (output: 250W each) and 24 500kW PV inverters, respectively.

The Daiwa House Group arrayed the solar panels in accordance with the terrain, keeping the original undulations without full-fledged land reclamation.

Some trees were cut down in the site. Following the Forestland Development Permission System, the former golf course had preserved forests inside a certain ratio. Because this ratio had to be kept, even after the purpose of land use was altered from a golf course to a solar power plant, the Daiwa House Group cut the trees within the range to meet this requirement.

By cutting down some trees on the side slopes within the course, the company could array solar panels even in such areas. The areas where some trees were cut down amounted to roughly 40,000m2. The amount was larger on the south side and smaller on the north side.