Alternative continuation method for loading margin improvement and transmission losses reduction

This paper presents an alternative methodology for loading margin improvement and total real power losses reduction by using a continuation method. In order to attain this goal, a parameterizing equation based on the total real power losses and the equations of the reactive power at the slack and generation buses are added to the conventional power flow equations. The voltages at these buses are considered as control variables and a new parameter is chosen to reduce the real power losses in the transmission lines. The results show that this procedure leads to maximum loading point increase and consequently, in static voltage stability margin improvement. Besides, this procedure also takes to a reduction in the operational costs and, simultaneously, to voltage profile improvement. Another important result of this methodology is that the resulting operating points are close to that provided by an optimal power flow program.

[1]  P. Kundur,et al.  Power system stability and control , 1994 .

[2]  L.C.P. da Silva,et al.  Investigation of the relationship between ill-conditioned power flow and voltage collapse , 2000 .

[3]  P. R. Bijwe,et al.  Look-ahead approach to power system loadability enhancement , 1997 .

[4]  Claudio A. Canizares,et al.  Point of collapse and continuation methods for large AC/DC systems , 1993 .

[5]  Carlos A. Castro,et al.  Continuation fast decoupled power flow with secant predictor , 2003 .

[6]  L. L. Freris,et al.  Investigation of the load-flow problem , 1967 .

[7]  M. Fette,et al.  Calculation of all algebraic solutions of electrical power systems by continuation method , 1999, PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376).

[8]  Alexander J. Flueck,et al.  A new continuation power flow tool for investigating the nonlinear effects of transmission branch parameter variations , 2000 .

[9]  A. M. Abed.  WSCC voltage stability criteria, undervoltage load shedding strategy, and reactive power reserve monitoring methodology , 1999, 1999 IEEE Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.99CH36364).

[10]  Hsiao-Dong Chiang,et al.  CPFLOW: a practical tool for tracing power system steady-state stationary behavior due to load and generation variations , 1995 .

[11]  G. Costa,et al.  A new approach to the solution of the optimal power flow problem based on the modified Newton's method associated to an augmented Lagrangian function , 1998, POWERCON '98. 1998 International Conference on Power System Technology. Proceedings (Cat. No.98EX151).

[12]  Venkataramana Ajjarapu,et al.  The continuation power flow: a tool for steady state voltage stability analysis , 1991 .

[13]  James H. Taylor,et al.  Real-time implementation of optimal reactive power flow , 2000 .