Improvements on the duality based method used in solving optimalpower flow problems

摘要

To improve the previously developed dual-type (DT) method used innsolving optimal power flow (OPF) problems with large number ofnthermal-limit constraints, the authors propose two new techniques innthis paper. The first one is a graph-method based decompositionntechnique which can decompose the large-dimension projection problem,ncaused by the large number of thermal-limit constraints, into severalnindependent medium-dimension projection subproblems at the expense ofnslight increment of the dual problem's dimension. The second techniquenis an active-set strategy based DT method which can solve thenmedium-dimension projection subproblems efficiently. They have used thenDT method embedded with these two new techniques in solving numerousnOPFs with large number of thermal-limit constraints. The test resultsnshow that the proposed techniques are very efficient and effectivelynimprove the DT method for handling large number of thermal-limitnconstraints