NDLI: Voltage stability assessment accounting for non-linearity of Thévenin voltages

Content Provider	IET Digital Library
Author	Karatas, Bahtiyar C. Jóhannsson, Hjortur Nielsen, Arne Hejde
Abstract	This study presents a new method that overcomes the limitations of previous Thévenin equivalent methods used for detecting voltage instability. The new method determines the maximum deliverable power to a load by accounting for the non-linearity of the Thévenin voltage seen from a load. The developed algorithm computes Thévenin equivalents seen from voltage-controlled and non-controlled nodes to determine how much load changes influence the contributing generators to a load. The algorithm computes an active load margin which gives information about the distance to instability. Tests are performed on the modified Nordic32 system, where the on-load tap changer mechanism of transformers was the driving force causing voltage instability that leads to small-signal rotor angle instability. The results demonstrate that the proposed method accurately detects voltage instability compared to the method based on the Thévenin impedance matching criterion, which first detects instability when the system conditions have crossed the critical boundaries.
Starting Page	3338
Ending Page	3345
Page Count	8
ISSN	17518687
Volume Number	14
e-ISSN	17518695
Issue Number	Issue 16, Aug (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/14/16
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2019.1774
Journal	IET Generation, Transmission & Distribution
Publisher Date	2020-05-28
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Active Load Margin Control of Electric Power System Developed Algorithm Computes Thévenin Equivalents Load Changes Maximum Deliverable Power Nonlinearity On Load Tap Changers Power System Control Power System Dynamic Stability Power System Security Power System Stability Previous Thévenin Equivalent Methods Rotors Small-signal Rotor Angle Instability Thévenin Impedance Matching Criterion Thévenin Voltage Voltage Control Voltage Instability Voltage Stability Assessment Accounting Voltage-controlled
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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