Energy saving system trend for harbor crane with lithium ion battery

This paper proposes several kinds of energy saving system for harbor crane such as Rubber Tyred Gantry Crane (RTGC) and Straddle Carrier (SC). Harbor crane carry the cargo not only horizontal direction but also vertical direction. Especially for vertical direction operation, power demand becomes greater in hoisting up a cargo. On the other hand, big regenerative power can be back in lowering a cargo. Even if big regenerative power is generated by motor so that RTGC and SC are powered by diesel engine generator, it is regenerated to not power source but braking resistor. Hence it can be reduced fuel consumption of diesel engine by utilizing its regenerative energy. To utilize regenerative energy it requires energy storage system. The proposed system adopts lithium ion battery (LiB) and its combined system is separated into three kinds of concept. Their proposed system accomplished 25 - 60% fuel consumption cut.