NDLI: Study of linear models in steady state load flow analysis of power systems

Content Provider	IEEE Xplore Digital Library
Author	Ping Yan Sekar, A.
Copyright Year	2002
Description	Author affiliation: Center for Electr. Power, Tennessee Technol. Univ., Cookeville, TN, USA (Ping Yan)
Abstract	Steady state analysis techniques use linear phasor circuit models, but power flow calculations require the solution of nonlinear algebraic equations. Small-signal linear models form the basis of solution algorithms such as the Newton-Raphson method and decoupled load flows. Since linear models are attractive from the viewpoint of gaining significant insight into system behavior under different operating scenarios, large-signal models such as 'DC models' are commonly employed. Results obtained from linear models are approximate, but they provide easy comparison between different operating conditions. Contingency ranking using a DC model, and generation shift and line outage distribution factors is highly satisfactory in many instances. Studies requiring steady state analysis such as security analysis, optimal power flow and economic dispatch, and voltage stability can significantly reduce computational burdens by assuming linear models. The main objective of this paper is to study quantitatively the relative merits of commonly used linear models in steady state power system analysis. The 'DC model' assumes negligible resistances and flat voltage profiles, and relates the bus phase angles to real power injections. A new linear model which accounts for the voltage and reactive power flows is developed, and compared to the results from 'DC model' and 'small-signal' models. The figure of merit for comparison is taken as the root mean square difference of similar quantities such as bus voltages and line active and reactive flows. IEEE 14-bus is used for the testing. Results show significant potential for the new linear model.
Starting Page	666
Ending Page	671
File Size	183907
Page Count	6
File Format	PDF
ISBN	0780373227
DOI	10.1109/PESW.2002.985087
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-01-27
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power system modeling Steady-state Load flow analysis Power system analysis computing Voltage Load flow Power system security Power system stability Circuits Nonlinear equations
Content Type	Text
Resource Type	Article

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