Dynamic compensation based feedforward control against output/input disturbance for LCL‐DAB DC–DC converter operated under no backflow power

Abstract

Abstract LCL‐type resonant dual‐active‐bridge (LCL‐DAB) DC–DC converters have more significant advantages in eliminating backflow power and achieving higher voltage gain compared with traditional dual active bridge (DAB) DC–DC converters. Therefore, LCL‐DAB DC–DC converters have a broad application prospect in DC micro‐grids, electric vehicles, uninterruptible power supplies etc. Since at this stage only a few researches on LCL‐DAB DC–DC converters have been done, here, the specific system operation region with triple‐phase‐shift (TPS) modulation scheme designed under no backflow power is presented. Furthermore, a dynamic compensation based feedforward control method under no backflow power is proposed, which enables the LCL‐DAB DC–DC converter to operate under no backflow power in wide region and achieve outstanding dynamic performance against output/input disturbance. Finally, the experimental results verify the feasibility and effectiveness of the proposed control method.

Keywords

• Power electronics, supply and supervisory circuits
• Control of electric power systems
• Distributed power generation
• DC‐DC power convertors
• Power convertors and power supplies to apparatus