PNNL

Abstract

This paper presents tests of different methods for long term voltage stability analysis based on PMU measurements. In particular, Thevenin Impedance Matching and sensitivity calculation are studied. Simulation are performed in a modified Argentine power system model, to include the main components for studying long term voltage stability. Disconnection of a large Thermal Generating Station causing long-term voltage instability at Gran Buenos Aires Area is studied. It is shown that computing the apparent impedance of Thevenin equivalent at load bus from measurements taken at a single time but at various locations of the transmission corridor produce a significant reduction of the estimation error produce when only local measurements are used. Voltage Stability analysis is performed using a reduced power system model where changing parameters are fully computed through PMU data at each time. Over this reduced power system model, voltage stability index and sensibility calculations are performed.