Quantification of Non-stationary Power Quality Events: A New Index Based on $\ell_p$-norm of Energy

TL;DR

This paper introduces a new index based on the $\

Contribution

It proposes a novel $\

Findings

The index accurately quantifies severity across various PQ events.

The method is validated with simulated, real, and experimental data.

The index is generic, monotonic, and easy to interpret.

Abstract

The present study proposes a new index to quantify the severity of non-stationary power quality (PQ) disturbance events. In particular, the severity of PQ events is estimated from their energy distribution in temporal-frequency space. The index essentially measures the $\ell_p$-norm between the energy distributions of an event and the nominal voltage signal. The efficacy of the new index is demonstrated considering a wide class of major non-stationary PQ events, including sag, swell, interruptions, oscillatory transients, and simultaneous events. The results of this investigation, with simulated, real and experimental data, convincingly demonstrate that the proposed index is generic, monotonic, easy to interpret, and can accurately quantify the severity of non-stationary events.