On battery state estimation algorithms for electric ship applications

In the last decade increasing concerns about the environment, financial reasons based on fuel prices and application-specific operational challenges have been driving the development of electric propulsion and hybrid or full-electric ships. The use of battery energy storage systems (BESS), which are suitable for a broad range of ship applications with different requirements, can reduce the use of fossil fuels. In this paper the benefits of an onboard DC grid, as applied by ABB, are briefly presented. The integration of BESS and the challenges for ship applications are also discussed. The focus of this paper is on a parameter identification method for an electric model of a battery and the evaluation and validation of a battery state estimation method, in respect to the accuracy requirements for ship applications.