0196-8904/$ see front matter 2010 Elsevier Ltd. A doi:10.1016/j.enconman.2010.11.004 ⇑ Corresponding author. Address: Electronic and E University of Technology, Modars Blvd., P.O. 71555-3 7264121; fax: +98 711 7353502. E-mail addresses: niknam@sutech.ac.ir, taher_n hasan_doagou@yahoo.com (H.D. Mojarrad), h.zeinaddin Economic dispatch (ED) is one of the important problems in the operation and ma...