Subsea Power Supply Based On Submarine Propulsion Technology

Abstract The paper reports on the development of electrical subsea power generation and storage systems based on non-nuclear air independent submarine propulsion technologies. Proven submarine technology represents a promising base for innovative and high-performance subsea solutions. Reliable and cost efficient electric power supply can be regarded as one of the most important factors for the successful development and operation of future subsea facilities. Long step outs, large water depths and remote locations without topside infrastructure pose challenges to cable based solutions. Submarine technologies can help to overcome these issues. Within the scope of the paper, an overview of conventional (non-nuclear) military submarine propulsion technology and its perspectives to be applied for civil subsea power supply systems is given. The outlined technologies include diesel-electric propulsion, lead and lithium ion batteries, and air independent propulsion (AIP) systems. For the latter, fuel cells and closed cycle diesel systems are described. The present work highlights the potential of such technologies to be applied as an energy supply for subsea systems. A modular concept is presented which is applicable for water depths up to 3000 m. It consists of battery components to satisfy large intermittent power demands as well as AIP modules which will be able to offer moderate base loads. This way, tailored hybrid battery/AIP solutions can be created which fit the needs of specific stationary and mobile subsea appliances. The concepts can easily be scaled in power and energy.