DP World Orders 19 Siemens Diesel-Hybrid Drive Gantry Cranes for Saigon Port-ECO-RTG diesel-electric hybrid gantry cranes.

http://www.greencarcongress.com/2008/03/dp-world-orders.html#more
14 March 2008
The new Saigon Premier Container Terminal in Vietnam, operated by DP World, has ordered a batch of 13 ECO-RTGs (Rubber Tire Gantry cranes) from Zhenhua Port Machinery Company (ZPMC) in Shanghai that use Siemens ECO-RTG hybrid drive systems. Siemens will deliver the ECO-RTG systems to ZPMC in October 2008.This is the second order for RTG hybrids from a DPWorld terminal, following an order for 6 that was placed at the end of 2007 by the DPWorld terminal in Djibouti.Operational data from container terminals that have purchased Rubber Tired Gantry cranes equipped with the hybrid ECO-RTG drive system indicate fuel savings of 50% or more compared to conventional RTG drive systems while maintaining the same levels of productivity.Energy generated through lowering of the load or braking of the gantry is stored and released again during hoisting or accelerating of the gantry. The ECO-RTG can accommodate a range of energy storage systems, such as banks of ultracapacitors. The design enables most of the energy stored during lowering to be available during hoisting.Key to the hybrid drive system is the patented diesel engine management system. The energy conversions in the system are kept to a minimum in order to get the most optimal drive system. The ECO-RTG uses Siemens ELFA drives specially developed for heavy mobile equipment and city buses powered by a diesel electric system.

The ECO-RTG drive system.
The drive system of the ECO-RTG uses a custom-made digital control unit (DICO) and DUO inverters. The DICO calculates energy consumption and regulates motor revolutions accordingly. This ensures an intelligent supply of energy, so the motor always operates efficiently.One DUO unit powers the DC busbar. The DICO is connected through a controller area network (CAN) bus system. Converters can be used as rectifier or inverter. One DUO unit consists of two different inverters (output 2 x 120 kVA). Also included are one or two phases for connection of a braking unit (if no energy storage is available). The units are extremely rugged in design and can be mounted next to the diesel engine in the motor compartment.The hybrid drive system enables the downsizing of the diesel engine. For example, ZPMC used a smaller diesel in the ECO-RTGs it built for APMT Algeciras than would have been used in the standard ZPMC RTG. Fuel consumption in the hybrid cranes was 6.5 liters per hour, compared to 21.3 liters/hour in a standard crane—a reduction of 69.5%.
Resources
Crane Fleet Management-Standardization Electrical Controls (Siemens)

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