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Energies 2017, 10(8), 1103; doi:10.3390/en10081103

A PMU-Based Method for Smart Transmission Grid Voltage Security Visualization and Monitoring

Department of Electrical Engineering, Feng Chia University (FCU), No. 100, Wenhwa Road, Seatwen, Taichung 40724, Taiwan
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Received: 26 June 2017 / Revised: 18 July 2017 / Accepted: 25 July 2017 / Published: 27 July 2017
(This article belongs to the Collection Smart Grid)
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Abstract

With the rapid growth of usage of phasor measurement units (PMUs) for modern power grids, the application of synchronized phasors (synchrophasors) to real-time voltage security monitoring has become an active research area. This paper presents a novel approach for fast determination of loading margin using PMU data from a wide-area monitoring system (WAMS) to construct the voltage stability boundary (VSB) of a transmission grid. Specifically, a new approach for online loading margin estimation that considers system load trends is proposed based on the Thevenin equivalent (TE) technique and the Mobius transformation (MT) technique. A VSB is then computed by means of real-time PMU measurements and is presented in a complex load power space. VSB can be utilized as a visualization tool that is able to provide real-time visualization of the current voltage stability situation. The proposed method is fast and adequate for online voltage security assessment. Furthermore, it enables us to significantly increase a system operator’s situational awareness for operational decision making. Simulation studies were carried out using different sized power grid models under various operating conditions. The simulation results are shown to validate the capability of the proposed method. View Full-Text
Keywords: loading margin; PMU; smart grid; synchrophasor; visualization; voltage security; voltage stability boundary; wide-area monitoring system loading margin; PMU; smart grid; synchrophasor; visualization; voltage security; voltage stability boundary; wide-area monitoring system
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Su, H.-Y.; Liu, T.-Y. A PMU-Based Method for Smart Transmission Grid Voltage Security Visualization and Monitoring. Energies 2017, 10, 1103.

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