A Modular Medium-Frequency Transformer-Based Converter for Current-Source Wind Energy Conversion System

A medium-frequency transformer (MFT)-based current source converter (CSC) was recently proposed for medium-voltage (MV) generator-based wind energy conversion systems, offering reduced size and weight compared to conventional solutions. However, this approach cannot be directly applied to low-voltage (LV) generator-based wind systems. To address this problem while preserving the advantages of the MV conversion system, this work proposes a new converter for LV generator-based wind systems. Because the proposed converter employs a modular converter, it introduces a current imbalance issue, and a current balancing control scheme is therefore developed to address this problem. Simulation results demonstrate that the proposed converter retains the benefits of the MV-based solution while extending its applicability to LV generators.