Analysis of Operating Characteristics of Parallel-Laminated Core type Variable Inductor

Abstract

In previous paper, we proposed a 3-phase variable inductor, which has a sinusoidal output current and a good controllability. We developed a trial 100-kVA var compensator for 6.6-kV ac distribution system using the 3-phase variable inductor. The variable inductor is composed of three orthogonal-cores that have wedge gaps for a reduction of harmonics in the output current. We reported that the trial var compensator is useful for voltage stabilization in the distribution system.
In case of application for a lager power system, the orthogonal-core is not so suitable for enlargement because of its peculiar structure. In this paper, we proposed a new variable inductor that is suitable for enlargement more than the orthogonal-core. We calculated the fundamental characteristics of the new variable inductor using the 3-D nonlinear magnetic circuit analysis.