Estimating the Voltage Stability of a Power System

TLDR

The study proposes an online method to detect voltage instabilities in power systems. The method defines an indicator L ranging from 0 (no load) to 1 (voltage collapse) and derives models based on normal load‑flow data to predict instability proximity. The method offers a simple numerical calculation and provides an expressive result for voltage stability assessment.

Abstract

A method for the online testing a power system is proposed which is aimed at the detection of voltage instabilities. Thereby an indicator L is defined which varies in the range between 0 (noload of system) and 1 (voltage collapse). Based on the basic concept of such an indicator various models are derived which allow to predict a voltage instability or the proximity of a collapse. The indicator uses information of a normal load flow. The advantage of the method lies in the simplicity of the numerical calculation and the expressiveness of the result.