General – Energy Storage System
Subsea7’s order for an Energy Storage System from Bakker Sliedrecht is a double first.
It is the first order for such a system on this scale for the Sliedrecht based independent system integrator.
Also, Subsea7’s Seven Arctic is believed to be the first heavy construction / flex-lay vessel in the world to be equipped with such an energy saving system.
“Our Energy Storage System consists of two containerised power converters with a nominal power of 3750 kW each and 1500 kWh of batteries,” explains Arend van der Velde, Head of Technology at Bakker Sliedrecht. “With this capacity the key functions for improved vessel performance are realised by the Power Plant Optimizer control system.”
The Spinning Reserve function enables the vessel to operate safely with fewer diesel generators online and those online with a higher utilisation. When the Peak Shaving function is active, the online diesel generators shift in a more optimal range with reduced intermittent starting of an additional generator. With Ramp Rate Control the online generators are supported by the batteries in strong load fluctuations, improving grid dynamics and stability and reducing wear and tear. Based on the vessel’s operating profile, an estimated reduction of 5,000 tons of CO2 emissions is expected.
The Energy Storage System is developed in close cooperation with Subsea7 to meet their ambition to make their fleet more sustainable. Before implementation on board, an extensive function and load test program will be executed.