A Study of Hybrid Energy Storage System to Suppress Power Fluctuations of Pulse Load in Shipboard Power System

With the rapid development of shipboard electric propulsion and DC power grid technology, the large number of pulse loads appear in the shipboard power system, which will cause dramatic power fluctuations and destroy the stability of the shipboard power system. Hence, the composition and structural characteristics of the shipboard power system are analyzed in this paper, and energy storage units, such as batteries and capacitors, are used to compensate pulse loads, suppress power fluctuations caused by pulse loads and maintain the stability of the shipboard power system. The structure and functional characteristics of energy storage units are analyzed and the effects of distributed and centralized energy storage units on the power stabilization of the shipboard power system are compared. A ship DC grid is built in PSCAD/EMTDC to verify the effects of energy storage system in simulation. The hybrid energy storage system of distributed capacitors and centralized batteries can effectively suppress power fluctuations caused by pulse loads in the shipboard power system.