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A Hybrid VLC-RF Portable Phasor Measurement Unit for Deep Tunnels.

Ismael Soto¹, Rafael Nilson Rodrigues², Gabriel Massuyama²

¹Department of Electrical Engineering, Universidad de Santiago de Chile, Santiago 9170124, Chile.

Sensors (Basel, Switzerland)

|February 7, 2020

Summary

This study introduces a hybrid Visible Light Communication and Radio Frequency (VLC-RF) system for portable Phasor Measurement Units (PMUs) in GPS-denied tunnels. The system provides accurate time and positioning for power grid monitoring underground.

Keywords:

deep tunnels global positioning system location mining sites phasor measurement units synchrophasors visible light communication

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Area of Science:

Electrical Engineering
Communication Systems
Power Systems

Background:

Global Positioning System (GPS) is unavailable in deep underground tunnels.
Accurate time and location data are crucial for power system monitoring.
Existing Phasor Measurement Units (PMUs) often lack robust positioning and timing in challenging environments.

Purpose of the Study:

To propose and validate a hybrid Visible Light Communication and Radio Frequency (VLC-RF) scheme for portable PMUs.
To enable accurate Coordinated Universal Time (UTC) synchronization and positioning in GPS-denied underground tunnels.
To enhance the control and monitoring capabilities of PMUs in subterranean environments.

Main Methods:

Computer simulations were employed to model the VLC-RF scheme.
Laboratory measurements were conducted to validate the simulation results.
A hybrid prototype was developed and tested for performance evaluation.

Main Results:

The proposed VLC-RF scheme successfully provided Coordinated Universal Time (UTC) and high-accuracy positioning.
The system demonstrated the capability to manage a large number of VLC-RF PMU devices within a tunnel.
Data transmission to a central monitoring station was achieved at hundreds of Kbps via an RF uplink.

Conclusions:

The hybrid VLC-RF prototype is viable for portable PMUs in underground tunnels.
The developed system offers improved performance over commercial PMUs lacking these integrated features.
This technology enhances power system monitoring and control in GPS-denied subterranean settings.