Thermal characteristics analysis of 50kVA Individual and Shared transformer/reactor model

Abstract

Background/Objectives: Transformers and reactors make up the largest share volume and weight of PCS components. Therefore, a shared transformer/reactor was introduce for decrease volume and weight. So characteristic analysis was conducted.

Methods/Statistical analysis: The shared model broadens the space between the coil primary and secondary sides of the basic transformer and inserts the reactor core. The individual model (transformer, reactor) was compared with that using a shared transformer/reactor. The comparison characteristic was power, inductance, and thermal analysis. The core and coil were set to the same material and size for a proper comparison. Characterization was performed using finite element analysis (FEA).

Findings:The purpose of using a shared transformer / reactor is to increase the effectiveness of the PCS. In particular, the weight and volume can be reduced. Some individual models (transformers, reactors) are commonly used to make a shared transformer/ reactor in a combined form. If each individual model requires two supporters and two spaces, the shared model needs only one supporter and one space. When the individual model was compared with the shared model by finite element analysis, the weight of 50kg was reduced and the model had similar characteristics. And the total volume can save about 3,600〖cm〗^3.This shows that the output density improves from 0.22 kVA/kg to 0.26 kVA/kg. In this process, the distance between the individual models was close to each other. The difference between the thermal and saturation flux density was found. On the other hand, smaller volume and lighter weight devices with the desired power and efficiency can be used to solve this problem. This study examined the interrelationships when common devices are combined.

Improvements/Applications: The transformer and reactor are installed separately when using a PCS. If a shared transformer / reactor is used, it can be installed in one place. The performance is similar when used as an individual model.

Keywords: Shared transformer/reactor, Thermal analysis, Transformer weight, Transformer inductance, Transformer characteristic analysis