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A more precision model of three-phase power system network was
developed to discuss the systematic optimal capacitor placement
problem in practical unbalanced feeders,both mutual coupling
effect and phase bus were considered in the three- phase load
flow.Besides,the planning of shunt capacitor include the
summation of peak power cost,energy cost and capacitor cost to
be the cost function and the limit of raising voltage under the
secure condition to be the constraint of nonliner programming
mathematices model,the simulation result will show the
affection of considering mutual coupling effect and daily load
curve in capacitor planning. On the other hand,the capacitor
planning criteria of Tai- power system was also discussed,and a
new method include fixed and switched capacitors placement was
suggested to improve the current criteria after the comparison
of Tai-power pratical feeder computer simulation of the two
criteria,better precision ,safety and more system operation
cost reduced was showed in the result to demonstrate the
effectiveness of the proposed method.
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