NDLI: Voltage stability assessment based on improved coupled single-port method

Content Provider	IET Digital Library
Author	Cui, Bai Wang, Zhaoyu
Abstract	This study proposes an improved coupled single-port method for the assessment of voltage stability based on phasor measurement unit (PMU) data. The impedance matching condition, i.e. the condition that the local load impedance and the Thévenin equivalent impedance are equal in magnitude at the loadability limit point, has been a fundamental assumption of many existing studies on voltage stability assessment. However, it is shown in this study that the impedance matching can happen either before or after the loadability limit point in certain cases. The authors have proven that the inaccuracy of the conventional impedance matching condition is due to the time-varying equivalent parameters of a power system. To deal with the dynamic nature of grid equivalence, they propose an innovative method to improve the conventional coupled single-port method. In the new method, voltage magnitude-to-load consumption sensitivity is used to adjust the equivalent parameters calculated by the coupled single-port method. Compared to conventional methods, the proposed method requires fewer PMU measurements and provides more accurate margin estimates. Case studies on extensive test systems validate the accuracy of the proposed method. The comparison between the conventional coupled single-port method and the developed method is also provided to demonstrate the effectiveness of the new method.
Starting Page	2703
Ending Page	2711
Page Count	9
ISSN	17518687
Volume Number	11
e-ISSN	17518695
Issue Number	Issue 10, Jul (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/11/10
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2016.2067
Journal	IET Generation, Transmission & Distribution
Publisher Date	2017-05-03
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Coupled Single-port Method Grid Equivalence Impedance Matching Impedance Matching Condition Improved Coupled Single-port Method Loadability Limit Point Local Load Impedance Phasor Measurement Phasor Measurement Unit PMU Data PMU Measurement Power Grid Power System Power System Control Power System Measurement And Metering Power System Stability Thevenin Equivalent Impedance Time-varying Equivalent Parameter Voltage Magnitude-to-load Consumption Sensitivity Voltage Stability Assessment
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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