Sistema de Controle Fuzzy Para Regulação de Tensão em Transformadores de Subestação (Fuzzy Control System for Voltage Regulation In Power Transformers)

Danilo Hernane Spatti (, Ivan Nunes da Silva (, Wesley Fernando Usida (, Rogerio Andrade Flauzino (

Universidade de São Paulo
This paper appears in: Revista IEEE América Latina

Publication Date: March 2010
Volume: 8,   Issue: 1 
ISSN: 1548-0992

A fuzzy control strategy for voltage regulation in electric power distribution systems is introduced in this article. This real-time controller would act on power transformers equipped with under-load tap changers. The fuzzy system was employed to turn the voltage-control relays into adaptive devices. The scope of the present study has been limited to the power distribution substation, and both the voltage measurements and control actions are carried out on the secondary bus. The capacity of fuzzy systems to handle approximate data, together with their unique ability to interpret qualitative information, make it possible to design voltage control strategies that satisfy both the requirements of the Brazilian regulatory bodies and the real concerns of the electric power distribution companies. A prototype based on the fuzzy control strategy proposed in this paper has also been implemented for validation purposes and its experimental results were highly satisfactory.

Index Terms:
Power distribution system, voltage regulation, fuzzy control, intelligent systems, voltage regulator relay.   

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