Discussion on the evaluation method of current unbalance compensation effect of three-phase unbalanced load adjusting device in distribution network

Abstract

Three-phase load imbalance in low-voltage distribution network is inevitable and exists for a long time. And a lot of devices are developed to solve the problems. However, in the current national standards and trade standards, there are only clear provisions on three-phase voltage imbalance, the provisions and test methods of three-phase current imbalance are relatively vague, and the compensation effect of the above devices cannot be effectively judged. From the perspective above, this paper establishes a 400V true low-voltage distribution network test platform, analyzes and determines the key parameters influencing the unbalanced current compensation ability in three-phase unbalanced load compensation device, and through reasonable settings for three-phase unbalanced working conditions, making the performance test verification of the current unbalance compensation effect of the products of several different manufacturers. The results show that the method can effectively evaluate the current imbalance compensation effect of the three-phase unbalanced load adjusting device, and is of guiding significance for standard revision and similar testing.