Wärtsilä LLC Quattro
The Low Loss Concept Quattro (LLC) is a proven energy efficient, and highly redundant power distribution system, for electric propulsion applications.
The system is available for both Low Voltage and Medium Voltage applications. It features a transformerless design, and its benefits include high redundancy, high efficiency and superb system availability.
The Low Loss Concept Quattro covers all power application between 15MW and 70MW in both the Low Voltage and Medium Voltage versions. It is effective also in vessels with operating profiles that require variable speeds, such as OSVs.
The LLC – Quattro is an electric distribution system shaped as a ring-network. Included in the network are four phase-shift transformers that constantly maintain a 30 degrees phase shift between the single bus bars.
This configuration provides maximum propeller availability through multiple supplies to the propeller drives. The reduced electric losses result in notably improved fuel consumption.
The ring shaped network of the LLC – Quattro, and its inherent lower short-circuit current level, enables the utilization of medium voltage (MV) converters with system voltages up to 6660V. This concept is suitable for applications up to approximately 70MW of installed power.
The Low voltage version will be able to operate in a ring configuration for up to 18MW of installed power generation.
The transformerless setup results in significant weight and space savings for the electric equipment. This also affects the supporting equipment, such as the cooling systems, foundations and cable installations.
The electric losses for the Quattro LLC are generally 2-3% lower than with an equivalent transformer-based solution.
Delivered in 2009, the 92 m Platform Supply Vessel ‘Viking Lady’ has a Wärtsilä Ship Design and combines four Wärtsilä 32DF dual-fuel engines with advanced vessel automation and Wärtsilä’s Low Loss Concept. »
Designed by Wärtsilä Ship Design and delivered in 2009, the AHTS ‘Siem Pearl’ features Wärtsilä’s Low Loss Concept and two Wärtsilä 16V32 engines, two gearboxes and two controllable pitch propellers. »