The electric ship integration initiative - an overview

Abstract

Abstrucr-An initiative for Robust Control and Reconfiguration o f Shipboard EIectric Power Systems is underway that combines long-term research and education objectives. The Electric Ship Initiation Initiative (ESIf) team brings together the programs and resources of leading electric power research institutions to develop near-to midterm electric ship concepts. Specific focus on the development and implementation of a new educational curriculum l o r scientists, engineers and naval officers provides an essential theme for the education and research program. This collaborative initiative involves 10 projects that are integrated with research throughout various thrust areas required to field a new generation o f more agile, robust, and cost-effective naval presence.

Impact of Marine Power System Architectures on IFEP Vessel Availability and Survivability

“…Furthermore, the breaking of DC fault currents has always been very difficult, although research into electro-mechanical hybrid and solidstate current interruption has shown promising results [12]. Papers [4] and [5] suggest the use of a hybrid IFEP power system ( Fig. 4.…”

“…Within the marine community there has been a debate for some time regarding DC versus AC power distribution systems [3], [4], [5], [8], [9]. The use of DC distribution offers certain advantages over AC distribution such as higher power transfers for similar voltages, unity power factor, no frequency synchronization for connecting ac systems coupled via a DC bus, no AC noise coupling, etc.…”

“…[2] A number of alternative IFEP power system architectures have been discussed such as radial and ring [3] [4]. In [4] and [5], hybrid power system architectures are considered, where there is a combination of AC and DC distribution. In addition, different configurations of commonly used radial and ring architectures have also been presented [6].…”

A Unique Ultracapacitor Direct Integration Scheme in Multilevel Motor Drives for Large Vehicle Propulsion

“…Compared to two-level inverters, multilevel inverters excel in nearly all the performance indexes. Therefore, they are particularly suited for high-power rating large vehicular motor drives (> 250 kW) [7], [17]- [20], where the added power switch cost is less of a concern. Multilevel converters achieve much lower output harmonic distortion with less switching stress and reduce or eliminate the need for passive filtering devices.…”

“…Among these large vehicles, the series powertrain topology is dominantly used and the propulsion motor and inverter are rated for the full vehicle power. Therefore, applications of multilevel converters in large vehicles are receiving considerable research interest [7], [17]- [20].…”