Dynamic Thévenin equivalent and reduced network models for PMU-based power system voltage stability analysis. (December 2018)

• Record Type: Journal Article
• Authors: Bidadfar, Ali; Hooshyar, Hossein; Vanfretti, Luigi
• Is Part Of: Sustainable energy, grids and networks. Volume 16(2018)
• Page Start: 126
• Page End: 135
• Publication Date: 2018-12
• Subjects: Voltage stability -- PMU -- Reduced network model; Renewable energy sources -- Periodicals; Smart power grids -- Periodicals; Electric power systems -- Periodicals; 333.794
• DOI: 10.1016/j.segan.2018.07.002
• Languages: English
• ISSNs: 2352-4677

Abstract

Abstract: Measurement-based real-time voltage stability assessment methods typically use a Thévenin Equivalent (TE) model. The TE is computed under the assumption that all generators and loads seen from an individual load-bus are constant during the time-window when measurements are obtained. This assumption does not hold in actual power systems. In fact, load changes at other load-buses result in variations on the voltage of a single-port equivalent model of the power system as seen from a load-bus. To consider these variations, this paper uses an interpolation method to develop a dynamic TE model from synchrophasor measurements, which is suitable for measurement-based real-time voltage stability assessment. In addition, a reduced network model is proposed to separate and quantify the impact of other loads and generators on the voltage stability of an interested load-bus in networks without full observability. The proposed method has been assessed through various simulation scenarios, and illustrated using actual field measurements.