Common Diesel Generator Protection (CDG-protection) protects the power plant of DP 2 and 3 on a cost-reducing way against blackouts and the consequences of disturbances.
Ships with DP 2 or 3 must remain in position at all times, even in the event of malfunctions, faults in the fuel system or the generators' voltage regulators. In order to avoid the consequences of faults, the power plant of a DP 2/3 vessel is usually divided into several operating islands. Due to the spread, all diesel generators run inefficiently, which is undesirable from a cost and environmental point of view. CDG-protection protects vessels against blackouts while being allowed to operate with a closed bus. With this protection, vessels are able and allowed to safely operate with less running generators. This reduces fuel consumption, maintenance and emissions.
Basic Main Switchboards with classic protection systems are not able to identify which diesel generator is the initiator when a powerplant fault occurs. CDG is a comprehensive protection system which continuously measures parameters and compares them with an advanced algorithm of the system. At the first level of deviation, a standby generator will be started and an alarm will be issued. If the deviations exceeds further, the faulty generator will be tripped, ensuring uninterrupted workings of the power plant.
Bakker Sliedrecht has developed the very first CDG safety system for a DP2 Dual-Fuel vessel with a combined power plant of over 40MW. The combined use of a mix of generators and sophisticated CDG-protection allows even further reductions in fuel consumption, maintenance and emissions. The solution has been approved by DNV-GL and is seen as a step forward in power plant protection.
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The drivers for the adoption of hybrid energy systems differ per ship segment and owner. For some, it’s the reduction in operational costs, improved grid stability or access to emission control area’s (ECAs) while for others the aspects of increased comfort or a (temporary) increase in power are more important.