Model predictive control of input-series output-parallel dual active bridge converters based DC transformer

• Published in: IET power electronics 2020-05, Vol.13 (6), p.1144-1152
• Main Authors: Zhang, Hang, Li, Yaohua, Li, Zixin, Zhao, Cong, Gao, Fanqiang, Hu, Yujie, Luo, Long, Luan, Kedong, Wang, Ping
• Format: Article
• Language: English
• Subjects: bidirectional power; bridge circuits; closed loop systems; core controller; DC transformer; DC‐DC power convertors; downscale DAB‐DCT laboratory prototype; dynamic performance; high‐ratio voltage conversion; input‐series output‐parallel dual active bridge converters; low‐voltage dc distribution; medium‐voltage dc distribution; model predictive control strategy; MPC scheme; power convertors; power transformers; predictive control; proper power distribution; proposed MPC strategy; Research Article; SPS; traditional voltage closed‐loop control scheme; voltage control
• ISSN: 1755-4535; 1755-4543; 1755-4543
• DOI: 10.1049/iet-pel.2019.1061

DC transformer (DCT) which is composed of dual active bridge (DAB) converters, is capable of fulfiling high-ratio voltage conversion between the medium-voltage dc distribution and low-voltage dc distribution. A model predictive control (MPC) strategy was proposed for the DAB-DCT to improve dynamic performance and achieve a proper power distribution, considering the bidirectional power of DCT. The traditional voltage closed-loop control scheme with the single-phase shift (SPS) and the MPC scheme with SPS are compared on a downscale DAB-DCT laboratory prototype, using PowerPC P2020 + FPGA_6SL X45 as the core controller. The excellent dynamic characteristics of DCT with proposed MPC strategy is verified by extensive experimental results.