(703b) Complex Energy System Which Combined Photovoltaic Power Generation With Electric Industrial Vehicle-Case Study of Maniwa SMART Factory-

SMART factory project has been developed under a grant from the Japanese government at Maniwa biomass base in Okayama Prefecture. In this developmental study, the following two research objects have been addressed. One is to build a new technology concerning manufacturing of nanofibers with high additional value from wood thinned from forests and unused wood parts from sawmills, and the other is to develop a new energy system and the elemental technologies which are provided renewable energy to meet the energy demand at the new factory producing nanofibers. The research target is to reduce economically CO₂ emissions of the entire factory by introducing these technologies.

A present factory which is built at Maniwa base has been producing wood chips from forest thinnings and two kinds of energies as light oil and electric power are consumed. Electric power has been used as the power of chip manufacturing equipment mainly. Light oil has been consumed as fuel for forklift trucks, shovel loaders and others. Electric power consumption is caused by 60% of CO₂ emissions from the factory and the remaining CO₂ emissions are due to light oil. Therefore, only the reduction usage of electric power is not enough to reduce significantly the CO₂ emissions of the factory. So, it is necessary to reduce the total consumption of electric power and light oil. In previous study, as a way to reduce electric power and fuels of vehicle simultaneously, the authors have been proposed a method according combined system of photovoltaic power generation (PV) and electric vehicle (EV).

In this paper, the new energy system has studied that industrial vehicle such as forklift trucks become exchanged to drive electricity which is supplied by PV, and PV power fluctuation become leveled using the storage battery in the industrial vehicle.

As a result, it is able to reduce CO₂ emissions by 25% according to introduce the new energy system that forklift trucks are driven by PV power which is charged directly to the battery in forklift trucks and is supplied to the factory if the surplus electricity is generated. In addition, it has a great possibility to reduce CO₂ emissions by 50% according to introduce an advanced system that shovel loaders and grapples will be driven by PV as the same as forklift trucks.