Two Area Power Systems Economic Dispatch Problem Solving Considering Transmission Capacity Constraints
This paper describes an efficient and practical method
for economic dispatch problem in one and two area electrical power
systems with considering the constraint of the tie transmission line
capacity constraint. Direct search method (DSM) is used with some
equality and inequality constraints of the production units with any
kind of fuel cost function. By this method, it is possible to use several
inequality constraints without having difficulty for complex cost
functions or in the case of unavailability of the cost function
derivative. To minimize the number of total iterations in searching,
process multi-level convergence is incorporated in the DSM.
Enhanced direct search method (EDSM) for two area power system
will be investigated. The initial calculation step size that causes less
iterations and then less calculation time is presented. Effect of the
transmission tie line capacity, between areas, on economic dispatch
problem and on total generation cost will be studied; line
compensation and active power with reactive power dispatch are
proposed to overcome the high generation costs for this multi-area
 C. L. Chen and N. Chen, "Direct Search Method for Solving Economic
Dispatch Problem Considering Transmission Capacity Constraints,"
IEEE Trans. Power Systems, vol. 16, no. 4, pp. 764-769, November
 D. Chattopadhyay, "Daily generation scheduling: Question for new
models," IEEE Trans. Power Systems, vol. 13, no. 2, pp. 624-629, May
 J. J. Shaw, "A direct method for security-constrained unit commitment,"
IEEE Trans. on Power Systems, vol. 10, no. 3, pp. 1329-1339, Aug.
 R. Baldick, "The generalized unit commitment problem," IEEE Trans.
Power Systems, vol. 10, no. 1, pp. 465-475, Feb. 1995.
 D. Streiffert, "Multi-area economic dispatch with tie line constraints,"
IEEE Trans. Power Systems, vol. 10, no. 4, pp.1946-1951, Nov.1995.
 T. Yalcinoz and M. J. Short, "Neural networks approach for solving
economic dispatch problem with transmission capacity constraints,"
IEEE Trans. Power Systems, vol. 13, no. 2, pp. 307-313, May 1998.
 Q. Xia,Y. H. Song, B. Zhang, C. Kang, and N. Xiang, "Dynamic
queuing approach to power system short term economic and security
dispatch," IEEE Trans. Power Systems, vol. 13, no. 2, pp. 280-285, May
 A. J.Wood and B. F.Wollenberg, Power Generation Operation and
Control. New York: John Wiley & Sons, Inc., 1984.
 H.Saadat, Power System Analysis. Second Edition, 2002, McGraw-Hill
Higher Education (ISBN 0-07-284-869-3).
 W.Stevenson, Element of Power System Analysis. Fourth Edition,