DC-Link Current Optimal Control of Current Source PWM Converter

The doubly-fed wind energy conversion system (WECS) based current-source converter has the advantages of robustness, inherent short-circuit protection and fault ride through capability. In addition, with the development of semiconductor technology and high switching frequency reverse resistance devices, the weakness of conventional current source converter (CSC) including low switching frequency, large passive components and slow dynamic performance can be improved by PWM current-source converter technology with high switching frequency. To apply this technique on doubly-fed induction generator, this paper analyzes the system configuration, operating principles and control strategies, then introduces an operation point calculation method for minimum DC bus current control of converters. The simulation results and prototype experiments verify the validity of system configuration, the optimization design of parameters and control strategies.