LINEAR-PROGRAMMING BASED OPTIMAL POWER-FLOW USING 2ND-ORDER SENSITIVITIES

For the electric railway traction in Sweden, a system of 130 kV transm ission lines connected parallel to the contact lines is being build. W ithin this system, the generation costs differs only slightly between different nodes with power injections. In order to optimize the power flow in the system, an extended optimal power flow algorithm based on successive linear programming, has been developed. To improve the conv ergence, a method based on a second order sensitivity approximation of the active power losses of the total system is applied. Numerical exa mples are given to show the enhanced convergence properties.