ships. These ships were constructed by the experts at the Neptun shipyard in Warnemünde near Rostock. The company was established in 1850. In 2002 it specialized in the construction of river cruisers and has built more than 65 river cruisers to date. Energy-efficient electricity generation on board The electrical energy and drive systems are based on the VACON® NXP Liquid Cooled Drive by Danfoss. The ship is fitted with four diesel-electrical energy generators. Two in the front engine room and 2 in the stern engine room. The four asynchronous generators controlled by VACON® NXP drives power the electric propulsion system and the onboard grid. Asynchronous generators are significantly more costeffective than conventional GenSets (standardized sets comprising a diesel engine and generator). They allow variable speed operation to optimise fuel efficiency at all times. The VACON® NXP Liquid Cooled Drive also plays an important part in minimizing noise levels for the passengers. Compared with conventional diesel mechanical drive trains to propeller drives, they ensure that the diesel generators run at a optimum in a sound-insulated area. It is easy to turn the generators on or off with the PMS (Power Management System) controller. This ensures that energy production always matches the real-time energy demand. The intelligent internal system of the VACON® NXP Liquid Cooled Drive quickly and reliably spreads the load between the generators. The engineers used the programming tool VACON® Programming (IEC 61131-3) to develop a control concept specifically for this purpose and installed it in the easilymodified control software of the VACON® NXP drives. Unlike in conventional diesel-electrical main drive systems, the experts at the Neptun shipyard did not have to install large switchboards, thanks to the DC bus concept. This provides a distinct advantage on ships where space is at a premium or could be better used to suit the ship’s purpose. The main drives and onboard micro grid drives of the MV Viking ships are designed to be compact and redundant. They meet all EU standards and guidelines for river cruisers as well as the approval conditions of Germanischer Lloyds. Diesel-electric generator 2 Danfoss Drives · DKDD.PC.936.A1.02 Overview of the power system
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