Using the Non-Intrusive Load Monitor for Shipboard Supervisory Control

Abstract

Field studies have demonstrated that it is possible to evaluate the state of many shipboard systems by analyzing the power drawn by electromechanical actuators [1], [2], [3], [4], [5].One device that can perform such an analysis is the non-intrusive load monitor (NILM). This paper investigates the use of the NILM as a supervisory control system in the engineering plant of gas-turbine-powered vessel. Field tests conducted at the Navy's DDG-51 Land-Based Engineering Site (LBES) demonstrate that the NILM can potentially reduce overall sensor count if used in a supervisory control system.

Shipboard Fluid System Diagnostic Indicators Using Non‐Intrusive Load Monitoring

“…In the case of RO units, for instance, the diagnostic tools presented in this paper represent only a portion of the NILM's capabilities. Cox et al (2007) and Mitchell (2007) discuss a number of other faults that can be detected by the NILM, including membrane failures, operator errors, and premature pump wear. The ability of the NILM to identify multiple faults in a single system demonstrates that it can simplify the monitoring and assessment process.…”

“…This software unit assesses load status using any required combination of current data, voltage data, spectral envelopes, and load operating schedules (Cox 2006). The successful application of this module has been demonstrated in numerous publications (Armstrong et al 2006; Cox et al 2006, 2007; DeNucci et al 2005; Laughman et al 2006; Lee 2003; Shaw 2000). Shipboard applications are highlighted in DeNucci et al (2005), Cox et al (2006), and Cox et al (2007).…”

“…One diagnostic platform that is particularly well suited for use aboard modern naval vessels is the non‐intrusive load monitor (NILM). The primary benefit of the NILM is that it can assess the operational status of multiple electrical loads from a single set of measurements collected at a central point in a ship's power‐distribution network (Leeb et al 1995; Ramsey et al 2004; Cox et al 2007). This reduction in sensor count makes the NILM a low cost and highly reliable system.…”

“…This paper focuses on the development of a field‐tested, model‐based method that can be used to detect filter clogging in RO units. Cox et al (2007) discuss the detection of several other faults in the RO system.…”

High-resolution physically-windowed sensors for power electronics applications

“…Analysis provides load disaggregation and detection, power consumption profiling, and diagnostics based on electrical signatures [1]- [5]. Many current sensors are available according to dynamic range and sensitivity.…”