Seyed Hossein HOSSEINI, Mehran SABAHI, Gevorg GHAREHPETIAN BABAMALEK, Farzad SEDAGHATI

Dynamic analysis of a modular isolated bidirectional dc-dc converter for high power applications

A new configuration for modular isolated bidirectional dc-dc converters is presented. The proposed converter has interesting features such as fewer switching devices, bidirectional power flow, and low switching losses. The simple modular structure, high frequency operation, zero voltage switching (ZVS) capability, and fewer switching devices make the extended configuration of the proposed converter suitable for high power applications. The operation principle of the proposed converter is analyzed in steady state, and then ZVS analysis of the converter is presented in detail. A generalized averaging technique, which uses dc and first order terms of Fourier s series of state variables, is applied to model the converter. A small-signal average model is developed to obtain the control-to-output transfer function of the converter. In order to obtain acceptable dynamic response, closed-loop control of the converter using a PID controller is studied. Finally, measurement and simulation results are presented to verify the operation principles of the converter and effectiveness of the PID controller.

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[1] Ayyanar R, Giri R, Mohan N. Active inputvoltage and loadcurrent sharing in input-series and output-parallel connected modular DCDC converters using dynamic input-voltage reference scheme. IEEE T Power Electron 2004; 19: 1462-1473.
[2] Chen W, Ruan X, Yan H, Tse Ch K. DC/DC conversion systems consisting of multiple converter modules: stability, control, and experimental verifications. IEEE T Power Electron 2009; 24: 1463-1474.
[3] Inoue S, Akagi H. A bidirectional isolated dc-dc converter as a core circuit of the next-generation medium-voltage power conversion system. IEEE T Power Electron 2007; 22: 535-542.
[4] Su GJ, Tang L. A multiphase, modular, bidirectional, triple-voltage dc-dc converter for hybrid and fuel cell vehicle power systems. IEEE T Power Electron 2008; 23: 3035-3046.
[5] Zhou H, Duong T, Sing ST, Khambadkone AM. Interleaved bi-directional dual active bridge DC-DC converter for interfacing ultracapacitor in micro-grid application. IEEE International Symposium on Industrial Electronics; 2010; pp. 2229-2234.
[6] Zhou H, Bhattacharya T, Tran D, Siew T, Khambadkone A. Composite energy storage system involving battery and ultracapacitor with dynamic energy management in microgrid applications. IEEE T Power Electron 2011; 26: 923-930.
[7] Shi J, Gou W, Yuan H, Zhao T, Huang A Q. Research on voltage and power balance control for cascaded modular solid-state transformer. IEEE T Power Electron 2011; 26: 1154-1166.
[8] Fan H, Li H. High-frequency transformer isolated bidirectional DCDC converter modules with high efficiency over wide load range for 20kVA solid-state transformer. IEEE T Power Electron 2011; 26: 3599-3608.
[9] Ghazanfari A, Hamzeh M, Mokhtari H, Karimi H. Active power management of multihybrid fuel cell/supercapacitor power conversion system in a medium voltage microgrid. IEEE T Smart Grid 2012; 3: 1903-1910.
[10] Shi J, Zhou L, He X. Common-duty-ratio control of input-parallel output-parallel (IPOP) connected DCDC converter modules with automatic sharing of currents. IEEE T Power Electron 2012; 27: 3277-3291.
[11] Zhao T, Wang G, Bhattacharya S, Huang AQ. Voltage and power balance control for a cascaded H-Bridge converterbased solid-state transformer. IEEE T Power Electron 2013; 28: 1523-1532.
[12] De Doncker R, Divan DM, Kheraluwala MH. A three phase soft-switched high power density dc/dc converter for high power applications. IEEE T Industry Appli. 1991; 27: 63-73.
[13] Kheraluwala MN, Gascoigne RW, Divan DM, Baumann ED. Performance characterization of a high-power dual active bridge DC-to-DC converter. IEEE T Industry Applic 1992; 28: 1294-1301.
[14] Peng FZ, Li H, Su GJ, Lawler JS. A new ZVS bidirectional DC-DC converter for fuel cell and battery application. IEEE T Power Electron 2004; 19: 54-65.
[15] Tao H, Duarte JL, Hendrix MA. Three-port triple-half-bridge bidirectional converter with zero-voltage switching. IEEE T Power Electron 2008; 23: 782-792.
[16] Zhao C, Round S, Kolar J. Full-order averaging modelling of zero-voltage-switching phase-shift bidirectional dc-dc converters. IET Power Electron 2010; 3: 400-410.
[17] Krismer F, Kolar J. Accurate small-signal model for the digital control of an automotive bidirectional dual active bridge. IEEE T Power Electron 2009; 24: 2756-2768.
[18] Bai H, Mi C, Wang C, Gargies S. The dynamic model and hybrid phase-shift control of a dual-active-bridge converter. 34th IEEE Annual Conference on. Industrial Electronics; 2008; pp. 2840-2845.
[19] Jacobs J, Averberg A, Doncker R De. Multi-phase series resonant dc-to-dc converters: Stationary investigations. 36th IEEE Power Electronic Special Conference; 2005; pp. 660-666.
[20] Engel SP, Soltau N, Stagge H, De Doncker W. Dynamic and balanced control of three-phase high-power dual-active bridge DCDC converters in DC-grid applications. IEEE T Power Electron 2013; 28: 1880-1889.
[21] Erickson RW, Maksimovic D. Fundamentals of Power Electronics, 2nd Edition, New York, NY, USA: Springer, 2001.
[22] Gaviria C, Fossas E, Grino R. Robust controller for a full-bridge rectifier using the IDA approach and GSSA modeling. IEEE T Circuits Systems I: Regular Papers, 2005; 52: 609-616.
[23] Ye Z, Jain P, Sen P. Phasor-domain modeling of resonant inverters for high-frequency ac power distribution systems. IEEE T Power Electron 2009; 24: 911-923.
[24] Qin H, Kimball JW. Generalized average modeling of dual active bridge DCDC converter. IEEE T Power Electron 2012; 27: 2078-2084.
[25] Qin H. Dual active bridge converters in solid state transformers. PhD, Missouri University of Science and Technology, Rolla, USA, 2012.
[26] Inoue Sh. Akagi Hi. A bidirectional DCDC converter for an energy storage system with galvanic isolation. IEEE T Power Electron 2007; 22: 2299-2306.
[27] Sanders SR, Noworolski JM, Liu XZ, Verghese GC. Generalized averaging method for power conversion circuits. IEEE T Power Electron 1991; 6: 251-259.
[28] Caliskan VA, Verghese OC, Stankovic AM. Multi frequency averaging of dc/dc converters. IEEE T Power Electron 1999; 14: 124-133.
[29] Ogata K. Modern Control Engineering, fifth edition, Upper Saddle River, NJ, USA: Prentice Hall, 2010.