Revista Eletrônica de Potência (Brazilian Journal of Power Electronics)

Palavras Chaves: comutação suave, Dual Active Bridge, Técnica de Modulação

Resumo
Devido à atual importância dos conversores Dual-Active-Bridge (DAB), este trabalho propõe uma estrutura de análise para modelar o comportamento estático do conversor quando submetido a uma modulação por múltiplas variáveis. Neste tipo de modulação, além da mudança da defasagem angular, as razões-cíclicas da tensão do primário e do secundário também são variadas. As análises apresentadas propõem ferramentas para definir o ponto de operação mais adequado para um conversor DAB, analisando o impacto da escolha desse ponto de operação em relação ao volume do núcleo magnético, as perdas no cobre e as fronteiras de comutação suave dos interruptores do primário e do secundário do conversor. Resultados experimentais para um protótipo de 800 W, 1200 W e 1600 W são apresentados para validar as análises propostas, onde diferenças de volume de até 35% são obtidas.

Title: IMPACTS OF THE MULTI-VARIABLES MODULATION ON TRANSFORMER AND SOFT-SWITCHING OF A DUAL-ACTIVE-BRIDGE

Keywords: Dual Active Bridge, modulation technique, soft switching

Abstract
Due to the current importance of DualActive-Bridge (DAB) converters, this work proposes an analysis framework to model the DAB static behavior when it is subjected to a multi-variables modulation. In this type of modulation, in addition to the angularphase-shift between the DAB H-bridges, the primary and secondary-side voltage duty-cycles can also be varied. The current analysis proposes tools to define the most suitable operation point for a DAB converter, analyzing the impact of choosing the operational point on the magnetic core volume, copper losses and soft-switching for primaryan secondary-side. Experimental results for a 800 W, 1200 W and 1600 W prototype are presented to validate the proposed analyzes, where a core volume variation of 35% was obtained.

[1] R. W. A. A. De Doncker, D. M. Divan, M. H. Kheraluwala, “A Three-Phase Soft-Switched HighPower-Density DC/DC Converter for High-Power Applications”, IEEE Transactions on Industry Applications, vol. 27, no. 1, pp. 63–73, Jan 1991.
Doi: 10.1109/28.67533

[2] M. N. Kheraluwala, R. W. Gascoigne, D. M. Divan, E. D. Baumann, “Performance Characterization of a High-Power Dual Active Bridge DC-toDC Converter”, IEEE Transactions on Industry Applications, vol. 28, no. 6, pp. 1294–1301, Nov 1992.
Doi: 10.1109/28.175280

[3] U. Khalid, M. M. Khan, Z. Xiang, Y. Jianyang, “Bidirectional Modular Dual Active Bridge (DAB) Converter Using Multi-Limb-Core Transformer with Symmetrical LC Series Resonant Tank Based on Cascaded Converters in Solid State Transformer (SST)”, 2017 China International Electrical and Energy Conference (CIEEC), pp. 627–632, Oct 2017.
Doi: 10.1109/CIEEC.2017.8388521

[4] C. Shuyu, V. B. Sriram, H. D. Tafti, K. V. R. Kishore, Y. H. Li, A. Tripathi, J. Pou, “Modular DAB DC-DC Converter Low Voltage Side DC Link Capacitor Two-Stage Charging-Up Control for Solid State Transformer Application”, 2017 Asian Conference on Energy, Power and Transportation Electrification (ACEPT), pp. 1–7, Oct 2017.
Doi: 10.1109/ACEPT.2017.8168624

[5] R. Mirzahosseini, F. Tahami, “A Lifetime Improved Single Phase Grid Connected Photovoltaic Inverter”, 2012 3rd Power Electronics and Drive Systems Technology (PEDSTC), pp. 234–238, Feb 2012.
Doi: 10.1109/PEDSTC.2012.6183332

[6] M. A. Moonem, H. Krishnaswami, “Analysis and Control of Multi-Level Dual Active Bridge DC-DC Converter”, 2012 IEEE Energy Conversion Congress and Exposition (ECCE), pp. 1556–1561, Sept 2012.
Doi: 10.1109/ECCE.2012.6342628

[7] H. Zhou, A. M. Khambadkone, “Hybrid Modulation for Dual-Active-Bridge Bidirectional Converter With Extended Power Range for Ultracapacitor Application”, IEEE Transactions on Industry Applications, vol. 45, no. 4, pp. 1434–1442, July 2009.
Doi: 10.1109/TIA.2009.2023493

[8] F. Krismer, J. Biela, J. W. Kolar, “A Comparative Evaluation of Isolated Bi-Directional DC/DC Converters with Wide Input and Output Voltage Range”, Fourtieth IAS Annual Meeting Conference Record of the 2005 Industry Applications Conference, 2005, vol. 1, pp. 599–606 Vol. 1, Oct 2005.
Doi: 10.1109/IAS.2005.1518368

[9] T. Ngo, J. Won, K. Nam, “A Single-Phase Bidirectional Dual Active Half-Bridge Converter”, 2012 TwentySeventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC), pp. 1127–1133, Feb 2012.
Doi: 10.1109/APEC.2012.6165960

[10] M. Steiner, H. Reinold, “Medium Frequency Topology in Railway Applications”, 2007 European Conference on Power Electronics and Applications, pp. 1–10, Sept 2007.
Doi: 10.1109/EPE.2007.4417570

[11] F. Krismer, J. W. Kolar, “Accurate Power Loss Model Derivation of a High-Current Dual Active Bridge Converter for an Automotive Application”, IEEE Transactions on Industrial Electronics, vol. 57, no. 3, pp. 881–891, March 2010.
Doi: 10.1109/TIE.2009.2025284

[12] R. W. DeDoncker, M. H. Kheraluwala, D. M. Divan, “Power Conversion Apparatus for DC/DC Conversion using Dual-Active-Bridges”, Assignee: Wisconsin Alumni Research Foundation, Patent number: 5.027.264, Date of Patent: Jun 25, 1991.

[13] I. Urquhart, J. Greenough, X. Liu, “Isolated bidirectional dual-active-bridge dc-dc converter with dual-phase shift control”, Assignee: Nissan Motor Manufacturing UK Ltd, Patent number: EP3079250A1, Date of Patent: Dec 10, 2016.

[14] B. Pierquet, M. Ozbek, A. D. Baglino, “Energy storage system with dual-active-bridge converter”, Assignee: Tesla Motors, Inc (Palo Alto, CA), Patent number: 10277029, Date of Patent: Apr 30, 2019.

[15] S. Inoue, H. Akagi, “A Bi-Directional Isolated DC/DC Converter as a Core Circuit of the Next-Generation Medium-Voltage Power Conversion System”, 2006 37th IEEE Power Electronics Specialists Conference, pp. 1–7, June 2006.
Doi: 10.1109/pesc.2006.1711782

[16] R. T. Naayagi, A. J. Forsyth, R. Shuttleworth, “Performance Analysis of Extended PhaseShift Control of DAB DC-DC Converter for Aerospace Energy Storage System”, 2015 IEEE 11th International Conference on Power Electronics and Drive Systems, pp. 514–517, June 2015.
Doi: 10.1109/PEDS.2015.7203567

[17] P. Liu, C. Chen, S. Duan, W. Zhu, “Dual Phase Shifted Modulation Strategy for the Three Level Dual Active Bridge DC DC Converter”, IEEE Transactions on Industrial Electronics, vol. 64, no. 10, pp. 7819–7830, Oct 2017.
Doi: 10.1109/TIE.2017.2696488

[18] F. Krismer, J. W. Kolar, “Closed Form Solution for Minimum Conduction Loss Modulation of DAB Converters”, IEEE Transactions on Power Electronics, vol. 27, no. 1, pp. 174–188, Jan 2012.
Doi: 10.1109/TPEL.2011.2157976

[19] F. Bandeira da Silva, E. Facanha de Oliveira, T. R. Fernandes Neto, P. Zacharias, “Design Optimization of a Three-Phase Bidirectional Dual Active Bridge DC/DC Converter”, PCIM Europe 2018; International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, pp. 1–8, June 2018.

[20] K. D. Hoang, J. Wang, “Design Optimization of High Frequency Transformer for Dual Active Bridge DCDC Converter”, 2012 XXth International Conference on Electrical Machines, pp. 2311–2317, Sep. 2012.
Doi: 10.1109/ICElMach.2012.6350205

[21] A. K. Jain, R. Ayyanar, “PWM Control of Dual Active Bridge: Comprehensive Analysis and Experimental Verification”, IEEE Transactions on Power Electronics, vol. 26, no. 4, pp. 1215–1227, April 2011.
Doi: 10.1109/TPEL.2010.2070519

[22] B. Zhao, Q. Song, W. Liu, “Efficiency Characterization and Optimization of Isolated Bidirectional DC–DC Converter Based on Dual-Phase-Shift Control for DC Distribution Application”, IEEE Transactions on Power Electronics, vol. 28, no. 4, pp. 1711–1727, April 2013.
Doi: 10.1109/TPEL.2012.2210563

[23] J. Fraytag, A. L. Kirsten, M. L. Heldwein, “Impact Analysis of a Multi-Variables Modulation on the Transformer of the Dual-Active-Bridge Converter”, IET Power Electronics, Jan 2020.
Doi: 10.1049/ietpel.2019.0963

[24] A. Kirsten, F. Carloto, T. Oliveira, J. Roncalio, M. Dalla Costa, “Phase-shift Design Methodology For The Dab Converter”, Eletrônica de Potência, vol. 19, pp. 231–240, Aug 2014.
Doi: 10.18618/REP.2014.3.231240

[25] W. T. McLyman, Transformer and Inductor Handbook, 3 ed., New York: Marcel Dekker, 1976.

[26] J. Vandelac, P. D. Ziogas, “A Novel Approach for Minimizing High-Frequency Transformer Copper Losses”, IEEE Transactions on Power Electronics, vol. 3, no. 3, pp. 266–277, July 1988.
Doi: 10.1109/63.17944

[27] W. A. Roshen, R. L. Steigerwald, R. Charles, W. Earls, G. Claydon, C. F. Saj, “High Efficiency, High Density MHz Magnetic Components for a Low Profile Converter”, [Proceedings] APEC ’92 Seventh Annual Applied Power Electronics Conference and Exposition, pp. 674–683, Feb 1992.
Doi: 10.1109/APEC.1992.228347

[28] P. Meyer, Y. Perriard, “Skin and Proximity Effects for Coreless Transformers”, 2011 International Conference on Electrical Machines and Systems, pp.1–5, Aug 2011.
Doi: 10.1109/ICEMS.2011.6073351

[29] A. Roßkopf, E. Bär, C. Joffe, “Influence of Inner Skin- and Proximity Effects on Conduction in Litz Wires”, IEEE Transactions on Power Electronics, vol. 29, no. 10, pp. 5454–5461, Oct 2014.
Doi: 10.1109/TPEL.2013.2293847

[30] R. M. F. Neto, E. G. Marra, F. L. Tofoli, L. C. de Freitas, “A Soft Switching Half-bridge Doubler Boost Converter Operating With Unity Power Factor”, Brazilian Journal of Power Electronics (SOBRAEP), vol. 10, no. 1, pp. 77–85, Jun 2005.
Doi: 10.18618/REP.2005.1.077085