Determination of optimum power-system operating conditions under constraints

The optimisation of power-system operating conditions is formulated as a general mathematical programming problem. All the system voltages, active and reactive generations and transformer tap settings are considered as independent variables, with network equations represented by equality constraints, and system operating limits by inequality constraints. An iterative indirect approach to the problem based on the Lagrange-Kuhn-Tucker conditions of optimality is presented, and the computer program is described briefly. A small sample system of part of the British 275/132kV network is solved.