Bstween a plurality xf power systemsq x

Claim 1

AN ELECTRIC POWER CONTROL SYSTEM FOR CONTROLLING THE GENERATION OF AN INTEGRATED POWER TRANSMISSION SYSTEM HAVING AT LEAST THREE INTERCONNECTED LOCAL POWER GENERATING SYSTEMS, EACH LOCAL SYSTEM INCLUDING MEANS TO AUTOMATICALLY CONTROL GENERATION OF THE GENERATING STATIONS THEREIN COMPRISING: TIE LINES INTERCONNECTING EACH OF SAID LOCAL SYSTEMS WITH AT LEAST ONE OTHER OF SAID LOCAL SYSTEMS, MEANS TO PROVIDE INCREMENTAL POWER COST COMPARISONS BETWEEN N-1 DIFFERENT PAIRS OF LOCAL POWER SYSTEMS, EACH OF SAID LOCAL POWER SYSTEMS BEING INCLUDED IN AT LEAST ONE OF SAID POWER COST COMPARISONS, SAID COST COMPARISON MEANS RECEIVING INCREMENTAL COST SIGNALS FROM MORE THAN TWO POWER SYSTEMS FOR DELIVERING POWER BETWEEN THE TWO SYSTEMS BEING COMPARED BY THE ASSOCIATED COST COMPARISON MEANS, SAID COMPARISON MEANS PROVIDING MODIFYING POWER INTERCHANGE SIGNALS FOR EACH OF THE PAIR OF LOCAL SYSTEMS BEING COMPARED THEREBY, MEANS TO TRANSMIT SAID MODIFYING POWER INTERCHANGE SIGNALS FROM EACH COMPARISON MEANS TO THE LOCAL SYSTEMS BEING COMPARED THEREBY, AND MEANS IN EACH OF THE LOCAL POWER SYSTEMS HAVING ASSOCIATED COST COMPARISON MEANS TO COMBINE THE RESPECTIVE MODIFYING POWER INTERCHANGE SIGNAL WITH A SCHEDULED POWER INTERCHANGE SIGNAL TO MODIFY THE POWER INTERCHANGE OF SAID LOCAL POWER SYSTEMS, AND MEANS TO VARY THE GENERATION OF THE GENERATING STATIONS WITHIN SAID PAIR OF LOCAL POWER SYSTEMS TO CAUSE GENERATION OF THE INTEGRATED POWER SYSTEM WITH THE POWER INTERCHANGE BETWEEN SAID PAIR OF LOCAL SYSTEMS BEING BASED UPON ECONOMIC CONSIDERATIONS.