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Recently, the clean energy to prevent global warming has been attracting much attention and the hybrid system designed to reduce the greenhouse gas and fuel consumption is becoming popular to be adopted. Transfer cranes that convey containers at container terminals are incorporated with large engine generators. Therefore, they consume much fuel (light oil), emit black smoke and greenhouse gases and produce noise, which have become problematic. Perceiving lithium-ion batteries as an electric strage, Sumitomo Heavy Industries Engineering & Services Co.,Ltd. recently developed a hybrid power supply system that charges a lithium-ion battery with the energy regenerated through the lowering operation and reuses the energy in the power-running hoisting operation. This hybrid system has solved the above problem by controlling the output power of the engine generator and downsizing the engine generator to approx. one third of that of the
conventional type.
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