Microprocessor controlled reactive power compensator for loss reduction in radial distribution feeders

A new real-time reactive power compensation scheme for distribution feeders is proposed. A network of data acquisition interfaces and microcontrolled fixed capacitor biased thyristor controlled reactors measures the reactive component of the load current at each feeder node and injects optimal levels of leading compensation current. The degree of compensation is determined by a dynamic approach, optimizing the total dollar savings which result for VAr compensation. Load currents are sampled every 3 s and compensation currents every 5 s and recalculated every 10 min. System response time is rapid enough to react to real-time load variations and closed loop control of thyristor firing angles enables adjustment for dynamic voltage fluctuations and compensator dissimilarities. A model compensation network was constructed and successfully tested in a laboratory environment.<
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