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

2. Non-Intrusive Load Monitor

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

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

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

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

7. 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

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

9. 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.

10. 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.

11. Zonal Distribution: DDG-51

12. Multi-function Monitor
MFM III

13. Stolen from the NGIPS Technology Development Roadmap
30 Nov 2007

14. Top Level System Architecture

15. 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

16. 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

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

18. 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