Abstract
A regulative rule and its characteristics for decentralized control of substation voltage and reactive power compensation by microcomputer are introduced. The hardware structure and software design are illustrated as well. The prototype of this system has been operating in Dajiaoting Substation in Beijing since September 1985. Two transformers with load tap changing (LTC) and two compensation capacitor banks in that station are under control. The operating result so far showed that the combined control rule of voltage and reactive power compensation according to the load compensation method by microcomputer is correct and reasonable. It can follow the variation of load to automatically determine the reasonable voltage that has to be maintained. The accuracy of voltage regulation can achieve 0.5% and that of reactive compensation is 5%. Its application can not only improve the voltage quality of power system, but also decrease loss of electric energy. The economic benefit is obvious.
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