Advanced steady-state models of UPFC for power system studies

In this paper, focus is on the UPFC steady-state modeling for the implementation of the device in the Newton-Raphson load flow algorithm. Two models, deriving from the known voltage source model (VSM), are presented and analyzed in detail. One is a power injection model (PIM) and the other one is the new shunt admittance model (SAM). Each one of these models represents a more robust and feasible alternative to the VSM because it bypasses the difficulties arising from the VSM, maintaining its advantages, though. Different simulations are presented in the paper to test and compare the models: Newton's quadratic convergence of the load flow algorithm is guaranteed by implementing the PIM and the SAM, with high convergence speeds.

[1]  Enrique Acha,et al.  A comprehensive Newton-Raphson UPFC model for the quadratic power flow solution of practical power networks , 2000 .

[2]  N.G. Hingorani,et al.  Flexible AC transmission , 1993, IEEE Spectrum.

[3]  L. Gyugyi,et al.  The unified power flow controller: a new approach to power transmission control , 1995 .

[4]  Laszlo Gyugyi,et al.  Operation of the unified power flow controller (UPFC) under practical constraints , 1998 .

[5]  Laszlo Gyugyi,et al.  Understanding FACTS: Concepts and Technology of Flexible AC Transmission Systems , 1999 .

[6]  C. Fuerte-Esquivel,et al.  Unified power flow controller: a critical comparison of Newton-Raphson UPFC algorithms in power flow studies , 1997 .

[7]  Enrique Acha,et al.  Newton-Raphson algorithm for the reliable solution of large power networks with embedded FACTS devices , 1996 .

[8]  Muhammad Mahdi Ibrahim Al-Hulail.  Optimal power flow with FACTS devices , 2004 .

[9]  Laszlo Gyugyi,et al.  Dynamic compensation of AC transmission lines by solid-state synchronous voltage sources , 1994 .

[10]  G. W. Stagg,et al.  Computer methods in power system analysis , 1968 .

[11]  N.G. Hingorani,et al.  High Power Electronics and flexible AC Transmission System , 1988, IEEE Power Engineering Review.

[12]  Mehrdad Ghandhari,et al.  Use of UPFC for optimal power flow control , 1997 .

[13]  M. R. Iravani,et al.  Steady-state and dynamic models of unified power flow controller (UPFC) for power system studies , 1996 .

[14]  E. Handschin,et al.  FACTS devices in liberalized power systems: an approach to loop flow problem , 2001, 2001 IEEE Porto Power Tech Proceedings (Cat. No.01EX502).

[15]  Y. H. Song,et al.  Power injection modeling and optimal multiplier power flow algorithm for steady-state studies of unified power flow controllers , 1999 .