Research On Reactive Power Balance And Voltage Control In A Substation

At present, a lot of substations are equipped with OLTC transformers and shuntcapacitors. It is able to greatly improve voltage quality and balance reactive powerflow to adjust transformer taps and switchable capacitor banks legitimately. Therefore,reactive power control in substation automation systems has caught more and moreattention.Most of domestic reactive power control devices apply the nine-area diagram topartition operating states and control strategy. However, the nine-area diagramabstract action of tap and capacitor as two separate univariate decision making.Therefore, in actual operation, the area of the control program using the usually ninedistricts figure, transformer tap and capacitors will increase number of actions toimprove the maintenance frequency affect the service life of electrical equipment.Scholars of the traditional nine-area diagram improvement, the introduction of a fuzzycontrol diagram form a12/17districts, can be used to reduce the number of actions toprevent control shock DWK-V-type substation reactive power control device that isbased on this principle; However, the improvements and not fundamentally solve theproblem of transformer tap and capacitors excess number of actions, unable to cometo the exact optimal decision. The DWK-V controller of capacitors in220kVTiechong substation, Huizhou Power Supply Bureau has some problems such asswitching on/off frequently, reversing reactive power, fluctuation of current value at10kV bus, vibration of switchgear.In this paper, the technical problems encountered by the author in the work, fromthe point of view of the theory and practice to clarify the various principles andapplication of substation reactive power balance and automatic control; introductionof particle swarm optimization algorithm can overcome the shortcomings ofbinaryparticle swarm optimization algorithm for the automatic control of voltage andreactive power. After analysis, the algorithm can be used for the optimization problemof substation reactive power balance and voltage regulator for voltage and reactivepower automatic control optimization model and the corresponding fitness function.