Three-Phase Imbalance Management and Economic Operation for Distribution Area with Natural Ester Insulating Transformers

Abstract

With the expanding application of natural ester insulating transformers in distribution area, the economic operation of distribution network becomes more and more important in order to reduce the overall cost in a distribution transformer’s life cycle. The imbalanced three-phase load increases the loss of transformers, and results in low voltage problem in the heavy load phase or even damages to customer’s electrical equipment. In this paper, a multi-objective optimal commutation mathematical model is established and verified to optimize the performance of the three-phase load imbalance regulation based on commutation switches. Compared with the common devices such as reactive compensation and SVG, the real-time online commutation switch system with an automatic commutation control strategy based on proposed vector genetic algorithm displays a better performance in reducing the power loss of distribution area as well as in solving the low voltage problem of users. We expect it to be a competitive solution for the economic and efficient operation of the distribution power grid.