Parametric Analysis of 50kVA Shared Transformer / Reactor According to Currents, Turns and Distance Between Transformer and Reactor Core

Abstract

Passive elements, transformer and reactor, were combined into a single element to reduce the volume of PCS(Power Conditioning Systme). This is called a shared model, but there has been little research conducted because of the new model. If the inductance is very low, the material area increases. In addition, the current density decreases, and short-circuit currents can occur. If it is enormous, the load loss is increased considerably due to the increase in eddy current loss and stray loss. The temperature of the windings and the device itself will increase. Therefore, finding the value of inductance will help in the low cost, safe, and efficient design of the transformer. Accordingly, each inductance was measured by setting various conditions through FEM(Finite element analysis).

System: PCS, such as inverters and converters, are needed to convert solar energy to a form of power suitable for the purpose. In addition, the advantages of PCS, such as small size, high efficiency, high power factor, high reliability, and low cost, are required. Among them, there are special devices that can compensate for size and cost issues. For a typical transformer and reactor to be replaced by a shared model, the output or performance of the two devices must first be similar. The shared model was designed by combining the transformer cores and reactor cores with the same size and specifications for a fair comparison. The essential element, inductance, was measured during the transformer design process. The transformer, reactor, and shared models are shown with different currents and turns. In the shared model, the primary coil performs both the transformer core and the reactor core. At this time, a gap is formed between the two devices. The changes in inductance according to the gap distance are shown in the text by FEM analysis.