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.
Highlights
Voltage stability has become a challenging issue in power industries since several major blackouts worldwide have been mainly attributed to voltage collapse [1,2,3]
Much attention has been devoted to understanding the voltage collapse phenomenon
It is essential that system operators identify system voltage instability to prevent possible voltage collapse
Summary
Voltage stability has become a challenging issue in power industries since several major blackouts worldwide have been mainly attributed to voltage collapse [1,2,3]. Based on this concern, much attention has been devoted to understanding the voltage collapse phenomenon. Voltage collapse is described as the phenomenon in which the events in sequential operations are accompanied by voltage instability This may lead to blackouts or abnormally low voltage distribution in a vital part of the power grid [4,5]. The Power-Voltage (P-V) curve is widely utilized for voltage stability analysis
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