Modulation of 2/3-Level Dual-Active-Bridge DC-DC Converters for Soft-Switching and Minimum Current Stress

This paper proposes an optimal modulation scheme for two-three (2/3)-level dual-active-bridge (DAB) DC-DC converters to guarantee zero-voltage-switching (ZVS) operation and minimize the current stress. Based on the unified ZVS principle, six operating modes are defined and constraints of each ZVS mode are then obtained. According to the operating modes, the power transmission model and current stress under all voltage conversion ratios are derived for optimization. The analytical solutions for minimum current stresses are obtained by using the Lagrange multiplier method with Karush-Kuhn-Tucker conditions. With the proposed modulation scheme, both the conduction and switching losses can be reduced, and thus, the entire efficiency can be improved. Finally, simulation results verify the theoretical analysis and the performance of the optimal modulation scheme.

[1]  M. A. Moonem,et al.  Capacitor voltage balancing in a neutral-point clamped multilevel dc-dc dual active bridge converter , 2017, 2017 IEEE 8th International Symposium on Power Electronics for Distributed Generation Systems (PEDG).

[2]  M. A. Moonem,et al.  Analysis and control of multi-level dual active bridge DC-DC converter , 2012, 2012 IEEE Energy Conversion Congress and Exposition (ECCE).

[3]  Wenhua Liu,et al.  Modular Multilevel High-Frequency-Link DC Transformer Based on Dual Active Phase-Shift Principle for Medium-Voltage DC Power Distribution Application , 2017, IEEE Transactions on Power Electronics.

[4]  M. Yaqoob,et al.  Realization of High-Efficiency Dual-Active-Bridge Converter With Reconfigurable Multilevel Modulation Scheme , 2020, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[5]  Guangzhu Wang,et al.  Analysis and Control of N-level Neutral-point Clamped Dual Active Bridge DC-DC Converter with Capacitor Voltage Balance , 2018, 2018 International Conference on Power System Technology (POWERCON).

[6]  Wenhua Liu,et al.  Comparative Analysis of Multilevel-High-Frequency-Link and Multilevel-DC-Link DC–DC Transformers Based on MMC and Dual-Active Bridge for MVDC Application , 2018, IEEE Transactions on Power Electronics.

[7]  Jun Huang,et al.  Unified Triple-Phase-Shift Control to Minimize Current Stress and Achieve Full Soft-Switching of Isolated Bidirectional DC–DC Converter , 2016, IEEE Transactions on Industrial Electronics.

[8]  Wenhua Liu,et al.  Overview of Dual-Active-Bridge Isolated Bidirectional DC–DC Converter for High-Frequency-Link Power-Conversion System , 2014, IEEE Transactions on Power Electronics.

[9]  Peng Liu,et al.  Dual Phase-Shifted Modulation Strategy for the Three-Level Dual Active Bridge DC–DC Converter , 2017, IEEE Transactions on Industrial Electronics.

[10]  Guowei Liu,et al.  High-Frequency-Link DC Transformer Based on Switched Capacitor for Medium-Voltage DC Power Distribution Application , 2016, IEEE Transactions on Power Electronics.

[11]  Huan Wang,et al.  Series-connected PV MVDC Converter for Large Scale PV System , 2019, 2019 10th International Conference on Power Electronics and ECCE Asia (ICPE 2019 - ECCE Asia).

[12]  Cong Wang,et al.  Performance analysis of high-frequency isolated dual half-bridge three-level bi-directional DC/DC converter , 2014, 2014 IEEE Conference and Expo Transportation Electrification Asia-Pacific (ITEC Asia-Pacific).

[13]  Tore Undeland,et al.  Optimized Design of Multi-MHz Frequency Isolated Auxiliary Power Supply for Gate Drivers in Medium-Voltage Converters , 2020, IEEE Transactions on Power Electronics.

[14]  F. Blaabjerg,et al.  An Optimized Hybrid Modulation Scheme for Reducing Conduction Losses in Dual Active Bridge Converters , 2019, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[15]  Sergio Busquets-Monge,et al.  Modulation and Capacitor Voltage Balancing Control of Multilevel NPC Dual Active Bridge DC–DC Converters , 2020, IEEE Transactions on Industrial Electronics.

[16]  Sergio Busquets-Monge,et al.  Operating Principle and Performance Optimization of a Three-Level NPC Dual-Active-Bridge DC–DC Converter , 2016, IEEE Transactions on Industrial Electronics.