Analysis of High Frequency Impedance Measurement Techniques for Power Line Network Sensing

TL;DR

This paper evaluates various high frequency impedance measurement techniques integrated into power line modems, assessing their accuracy and effectiveness for network monitoring and fault detection in smart grids.

Contribution

It provides a technical comparison of voltage and impedance measurement methods for power line networks, highlighting their accuracy and suitability for fault detection.

Findings

Impedance measurement techniques vary in accuracy under network noise.

Certain methods outperform others in fault detection scenarios.

Statistical analysis of noise impacts improves measurement reliability.

Abstract

A major aspect in power line distribution networks is the constant monitoring of the network properties. With the advent of the smart grid concept, distributed monitoring has started complementing the information of the central stations. In this context, power line communications modems deployed throughout the network provide a tool to monitor high frequency components of the signals traveling through a power line network. We propose therefore to use them not only as communication devices but also as network sensors. Besides classical voltage measurements, these sensors can be designed to monitor high frequency impedances, which provide useful information about the power line network, as for instance status of the topology, cable degradation and occurrence of faults. In this article, we provide a technical analysis of different voltage and impedance measurement techniques that can be integrated into power line modems. We assess the accuracy of the techniques under analysis in the presence of network noise and we discuss the statistical characteristics of the measurement noise. We finally compare the performances of the examined techniques when applied to the fault detection problem in distribution networks, in order to establish which technique gives more accurate results.