Calculation of total transfer capability incorporating the effect of reactive power

Abstract Total transfer capability (TTC) is an important index in power markets with large volume of interarea power exchanges and/or wheeling transactions. In this paper, a mathematical programming approach is proposed to calculate the TTC considering reactive power and voltage effects. The objective function is to maximize the power transmission between specific generator(s) and load(s) subject to the constraints of load flow equations and system operation limits. Since the reactive power generation is taken as a control variable in the formulation, the bus voltages can be optimized to yield maximum transfer capability. The model tends not to hamper the sales capability of the existing generators in the market, but rather finds out additional allowable transactions for that particular system operating condition. The adopted approach can avoid the conservativeness of continuation power flow (CPF) methods. The sequential quadratic programming (SQP) is used to solve the problem. The computer results from a 4-bus test system and the IEEE 30-bus system show a great potential of the proposed method in calculating TTC.

[1]  George Gross,et al.  OASISNET: an OASIS network simulator , 1998 .

[2]  Gordon S. G. Beveridge,et al.  Optimization: theory and practice , 1970 .

[3]  William F. Tinney,et al.  Optimal Power Flow Solutions , 1968 .

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

[5]  Singiresu S. Rao.  Engineering Optimization : Theory and Practice , 2010 .

[6]  George L. Landgren,et al.  Transmission Interchange Capability - Analysis by Computer , 1972 .

[7]  R. Adapa,et al.  A review of selected optimal power flow literature to 1993. II. Newton, linear programming and interior point methods , 1999 .

[8]  Thomas J. Overbye,et al.  Inclusion of price dependent load models in the optimal power flow , 1998, Proceedings of the Thirty-First Hawaii International Conference on System Sciences.

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

[10]  K. Schittkowski.  NLPQL: A fortran subroutine solving constrained nonlinear programming problems , 1986 .

[11]  Peter W. Sauer.  Alternatives for calculating transmission reliability margin (TRM) in available transfer capability (ATC) , 1998, Proceedings of the Thirty-First Hawaii International Conference on System Sciences.

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

[13]  P. Boggs,et al.  Sequential quadratic programming for large-scale nonlinear optimization , 2000 .

[14]  James A. Momoh,et al.  Optimal power flow : solution techniques, requirements, and challenges , 1996 .

[15]  Felix F. Wu,et al.  Considerations in Calculating Total Transfer Capability , 1998 .

[16]  Alexander J. Flueck,et al.  Investigating the installed real power transfer capability of a large scale power system under a proposed multiarea interchange schedule using CPFLOW , 1996 .