Ship Electric Power Systems: Activities at MIT J. L. Kirtley Jr. ESRDC Team Meeting May 20, 2008

Non-Intrusive Load Monitor

Ship-board Installation Voltage Board Power Supply Monitor Mini-PC Output to PC NILM Box UPS Current Input Voltage Input

Transient-Based Identification Transient electrical behavior is strongly influenced by the physical task performed by the load

Spectral Envelopes Stator current and P1 for a 3-phase induction motor

Field Experiments USCG Cutters Seneca and Escanaba USN DDG-51 LBES

Field Condition Based Monitoring Cycling Systems, e.g., waste disposal Auxiliary Sea Water (ASW) Reverse Osmosis Steering Gear HVAC Roll-Fin Control Prop Pitch Control Electrical Distribution Anchor Windlass Gas Turbine Generators (GTG) Gas Turbine Propulsion (GTM) Gas Turbine Support Systems

Reconfiguration During Escanaba Check Valve Leak A trade-off: increased wear and energy expense during the (hopefully brief) reconfiguration period before casualty repair.

On three separate occasions we have been presented with NILM data showing improper operation…This data steered us directly to the malfunctions weeks before they became mission critical.

Conclusion Significant success using nonintrusive electrical load monitoring to diagnose system faults in electromechanical systems. Successful installations on-board USCGC Seneca, USCGC Escanaba, and at the USN DDG-51 LBES facility. Goal: collaborate with a USN crew to use the NILM to detect and remediate electromechanical problems before they become mission cripples.

Zonal Distribution: DDG-51

Multi-function Monitor MFM III

Stolen from the NGIPS Technology Development Roadmap 30 Nov 2007

Top Level System Architecture

Power Systems on Ships: Generation Drive Motors and Drives This is one of many notional diagrams to show functionality of the ship electric power system House and Mission Loads Distribution: Wires, Switches and Controls

Choices that will impact ship effectiveness and cost (among others): Generation: Range of ratings Distribution: AC or DC; AC frequency Voltage Level Topology Drive Motors Type Location Controls Supervisory NILM Reconfiguration Storage

Generators Ratings Distribution Frequency Voltage Topology Control Strategy Loads Storage Architectural Model Performance Metrics Efficiency Stability Quality of Service Maintainability Cost Weight

Modular Podded Propulsion System Multiple Modules for Redundancy Enhanced TORUS: PM Rotors are Free Spinning Can be stopped if faulted Maintains advantages of PM AND DFM Can un-clutch a section to stop damage from a fault