An Improved Current-Source-Converter-Based Series-Connected Wind Energy Conversion System
Ling Xing, Qiang Wei, Ryan Li
Abstract
The passive-rectifier-based current source converter (CSC) used in the series-connected wind energy conversion system features low cost, high reliability, and simple control, but it suffers from highly distorted generator stator currents. A new CSC-based wind energy conversion system composed of a multiphase generator, a passive rectifier, a modular medium-frequency transformer-based converter, and a CSC is proposed. In addition, two versions of the proposed converter are being developed for low- and medium-voltage turbine systems, respectively. The operation principle is presented, controls are developed, and simulations and experiments are conducted. Both converters offer excellent generator stator current harmonic performance while also retaining the advantages of the existing CSC-based converters.