|One configuration of SISHIP EcoProp. Click to enlarge.|
The main diesel engine runs at a constant speed, driving an electrical generator that feeds a propulsion motor through a switchboard and converters. This system exploits the optimized efficiency resulting from operating the engine as close as possible to its design point. The intelligent hybrid control and the diesel-electric system continuously drives the engines within the desirable speed and load ranges.
With Siemens’ new SISHIP EcoProp, the ship can be operated in 4 different modes:
Diesel mode: Power from propulsion diesels, driving a geared generator.
Battery mode: Electrical power from batteries feeds the ship service net and propulsion.
Electro mode: Power from harbor generator charging batteries, supplying the ship service net.
Hybrid mode: Propulsion diesels driving the vessel with additional power from geared electrical motors.
The SISHIP EcoProp systems offer power ranging from 100 kW to 800 kW.
|Example of a single-line hybrid powertrain in a large LNG carrier. Click to enlarge. Source: Siemens Marine|
This type of system has been used for years in cruise liners and specialized ships, such as offshore supply ships, patrol boats, ice breakers and research vessels, according to Siemens Marine. Cost, weight, required space and complexity prevented vessels under 40 meters from taking advantage of a similar systems, according to Siemens.
The SISHIP Eco Prop is an integrated solution which provides the benefits of Hybrid Diesel Electric Propulsion systems for smaller vessels traditionally powered by conventional mechanical propulsion systems.
The limited oil reserves and increasing environmental issues make people think about complementing conventional drive concepts in ship building with means of expanding efficient operation conditions.—Ernst-Christoph Krackhardt, Director of Sales, Commercial Ships, Siemens Marine Solutions.