Graph oriented algorithm for the steady-state security enhancement in distribution networks

The problem of steady-state security enhancement of radial distribution networks after structural disturbances causing violations of imposed operating limits is considered. Corrective actions used for relief of violations are of switching-operations type. The development of a graph-oriented control algorithm that is based on the linearized system model is described. The synthesis of corrective controls is formulated as a combinatorial problem of mixed-integer programming, and a heuristic algorithm is suggested as a solution of the problem. The feasibility of the algorithm is tested on examples of real medium-voltage distribution networks; one of urban, underground-cable type, and the other of suburban, overhead-line type. Results have shown the suitability of the approach for the solution of practical corrective control problems.