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Robust Thevenin Equivalent Parameter Estimation for Voltage Stability Assessment
IEEE Transactions on Power Systems, 2018This letter presents a robust approach to accurate estimation of Thevenin equivalent (TE) parameters using phasor measurement unit (PMU) data for online voltage stability assessment. The TE parameter estimation is formulated as a worst-case robust least squares problem to take PMU uncertainties into account. A second-order cone programming technique is
Heng-Yi Su
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IEEE Transactions on Magnetics, 1996 The finite element method is a well-established technique in the analysis of electromagnetic fields. A theory of equivalent fields, analogous to equivalent circuits in network theory is developed. It extends diakoptic analysis and permits solution of two (or more) coupled boundary-value problems independently, representing their mutual coupling by ...
SANTINI, Ezio, P. P. Silvester
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Improvement of Thevenin Equivalent Parameters and Computations
Advanced Materials Research, 2012In this paper, the conventional method to acquire Thevenin equivalent parameters is described. The method is based on features of power systems and utilizes the base-case system information. Considering the impact of loads on Thevenin equivalent potential and impedance, this paper makes improvements and brings it closer to the actual situation.
Ming Qiang Wang +2 more
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On-line estimation of thevenin equivalent with varying system states
2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century, 2008For power system, Thevenin equivalent at a node can represent the aggregation of systempsilas operation conditions, e.g. generator terminal voltages, load powers, and line impedances, seen from a bus. estimation of Thevenin equivalent can be challenging given that active controls in power systems vary the systempsilas states with time.
S.-J. Steven Tsai, K.-H. Wong
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A preliminary study on the Thevenin equivalent impedance for power systems monitoring
2011 4th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT), 2011It is an important task to accurately estimate the Thevenin equivalent impedance seen from a load bus for power systems monitoring and control. The purpose of this paper is to investigate the mechanism and characteristics of the Thevenin equivalent impedance in a nonlinear circuit. A general model is introduced for investigating the Thevenin equivalent
Xiaoming Mou, Weixing Li
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A Dynamic Model of Impedance for Online Thevenin’s Equivalent Estimation
IEEE Transactions on Circuits and Systems II: Express Briefs, 2022A time domain dynamic model of impedance has been developed in this work for online estimation of Thevenin’s equivalent impedance of a network seen from a bus. Although the time domain impedance (ratio of instantaneous AC voltage and current) is undefined in a period, a zone of definition and workability has been defined.
Arpan Malkhandi +2 more
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Voltage stability assessment using equivalent Thevenin
2015 IEEE Thirty Fifth Central American and Panama Convention (CONCAPAN XXXV), 2015The voltage stability in the power systems operation has taken importance due to the restrictions in the network when there is a growing demand. This has motivated hundreds of researchers to develop methods to detect the voltage instability's proximity, which reduces computational time and helps to take accurate decisions, guaranteeing a reliable and ...
L. Paniagua, R. B. Prada
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Thevenin equivalent parameter tracking for on-line voltage stability assessment
2015 IEEE Innovative Smart Grid Technologies - Asia (ISGT ASIA), 2015This paper demonstrated a method for online voltage stability assessment of a load bus using bus phasor measurements. The power system is represented by Thevenin equivalent model, which parameters are estimated by applying new methods based on discrete Kalman filter (DKF) and unscented Kalman filter (UKF). Voltage stability index is calculated based on
Mohammad Nazrul Islam +1 more
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The Thevenin—Norton Equivalent Circuit
IETE Journal of Education, 2006The Thevenin-Norton (TN) equivalent of a one-port network is a combination of the Thevenin and Norton equivalents and contains both a voltage source and a current source. The concept of the TN equivalent is explained and its usefulness illustrated with examples.
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On Thevenin's and Norton's Equivalent Circuits
IEEE Transactions on Education, 1982This paper provides a good look at the concept of equivalence in general and at Thevenin's and Norton's theorems in particular. The ain is to investigate simple, general, and comprehensive ways to present and prove these theorems. It is shown that linearity and the absence of external coupling should not be conditions for Thevenin's and Norton's ...
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