Application of pattern recognition techniques for online security-economy and reactive control of power systems

The author discusses a new methodology for applying the pattern recognition method developed by the author in the two related areas of security-economy preventive control and reactive control. Each application varies the amount of active and/or reactive (P-Q) power injected into the network busbars, and the network then responds by readjusting its busbar voltages and flows accordingly. Using the amount of P-Q busbar injections for evaluating the relative merits of one control measure against the others, a `raise´ and a `lower´ priority list may be formed for correcting overload on each transmission line and for correcting undervoltage at each busbar. The author also describes the development and results of an algorithm formulated using the linear programming technique to shift busbar P-Q injections for relieving the overloaded transmission lines, and for minimising the busbar P-Q injection change during shifting