A Novel Extended Noninvasive Harmonic Resonance Detection Technique for Public Low-Voltage Networks

Harmonic resonance is increasingly observed in public low-voltage (LV) networks of central European countries. Adverse effects, such as harmonic disturbance amplification, can be caused by harmonic resonance, which necessitates and emphasizes the importance of their continuous monitoring and detection. This article proposes a noninvasive harmonic resonance detection technique for public LV networks that rely only on the measurement of voltage and current at the LV busbar. The proposed technique is formulated in three stages, each identifying a different characteristic of harmonic resonance: the presence of harmonic resonance, resonant harmonic order and bandwidth, and resonant intensity. The performance of each stage is first verified by extensive simulation. Then, using measurement data at three different LV networks, it is validated that the proposed technique can reliably track the three different characteristics of harmonic resonances accurately and continuously.