A Bidirectional Dual Buck-Boost Voltage Balancer with Direct Coupling Based on a Burst-Mode Control Scheme for Low-Voltage Bipolar-Type DC Microgrids

- Journal title : Journal of Power Electronics
- Volume 15, Issue 6, 2015, pp.1609-1618
- Publisher : The Korean Institute of Power Electronics
- DOI : 10.6113/JPE.2015.15.6.1609

Title & Authors

A Bidirectional Dual Buck-Boost Voltage Balancer with Direct Coupling Based on a Burst-Mode Control Scheme for Low-Voltage Bipolar-Type DC Microgrids

Liu, Chuang; Zhu, Dawei; Zhang, Jia; Liu, Haiyang; Cai, Guowei;

Liu, Chuang; Zhu, Dawei; Zhang, Jia; Liu, Haiyang; Cai, Guowei;

Abstract

DC microgrids are considered as prospective systems because of their easy connection of distributed energy resources (DERs) and electric vehicles (EVs), reduction of conversion loss between dc output sources and loads, lack of reactive power issues, etc. These features make them very suitable for future industrial and commercial buildings' power systems. In addition, the bipolar-type dc system structure is more popular, because it provides two voltage levels for different power converters and loads. To keep voltage balanced in such a dc system, a bidirectional dual buck-boost voltage balancer with direct coupling is introduced based on P-cell and N-cell concepts. This results in greatly enhanced system reliability thanks to no shoot-through problems and lower switching losses with the help of power MOSFETs. In order to increase system efficiency and reliability, a novel burst-mode control strategy is proposed for the dual buck-boost voltage balancer. The basic operating principle, the current relations, and a small-signal model of the voltage balancer are analyzed under the burst-mode control scheme in detail. Finally, simulation experiments are performed and a laboratory unit with a 5kW unbalanced ability is constructed to verify the viability of the bidirectional dual buck-boost voltage balancer under the proposed burst-mode control scheme in low-voltage bipolar-type dc microgrids.

Keywords

Bipolar-type DC microgrid;Burst-mode control;Dual buck-boost voltage balancer;N-cell;P-cell;

Language

English

References

1.

H. Kakigano, Y. Miura, and T. Ise, “Low-voltage bipolar-type dc microgrid for super high quality distribution,” IEEE Trans. Power Electron., Vol. 25, No. 12, pp. 3066-3075, Dec. 2010.

2.

J. Lago and M. L. Heldwein, “Operation and control-oriented modeling of a power converter for current balancing and stability improvement of DC active distribution networks,” IEEE Trans. Power Electron., Vol. 26, No. 3, pp. 877-885, Mar. 2011.

3.

H. Kanchev, D. Lu, F. Colas, V. Lazarov, and B. Francois, “Energy management and operational planning of a microgrid with a PV-based active generator for smart grid applications,” IEEE Trans. Ind. Electron., Vol. 58, No. 10, pp. 4583-4592, Oct. 2011.

4.

X. Zhang, and C. Gong, “Dual-buck half-bridge voltage balancer,” IEEE Trans. Ind. Electron., Vol. 60, No. 8, pp. 3157-3164, Aug. 2013.

5.

G. Byeon, T. Yoon, S. Oh, and G. Jang, “Energy management strategy of the DC distribution system in buildings using the EV service model,” IEEE Trans. Power Electron., Vol. 28, No. 4, pp. 1544-1554, Apr. 2013.

6.

G.S. Seo, K.C. Lee, and B.H. Cho, "A new DC anti-islanding technique of electrolytic capacitor-less photovoltaic interface in DC distribution systems,” IEEE Trans. Power Electron., Vol. 28, No. 4, pp. 1632-1641, Apr. 2013.

7.

C. S. Leu, and Q. T. Nha, “A half-bridge converter with input current ripple reduction for DC distribution systems,” IEEE Trans. Power Electron., Vol. 28, No. 4, pp. 1756-1763, Apr. 2013.

8.

T. F. Wu, C. H. Chang, L. C. Lin, G. R. Yu, and Y. R. Chang, “DC-bus voltage control with a three-phase bidirectional inverter for DC distribution systems,” IEEE Trans. Power Electron., Vol. 28, No. 4, pp. 1890-1899, Apr. 2013.

9.

S. Anand, B. G. Fernandes, and M. Guerrero, “Distributed control to ensure proportional load sharing and improve voltage regulation in low-voltage DC microgrids,” IEEE Trans. Power Electron., Vol. 28, No. 4, pp. 1900-1913, Apr. 2013.

10.

P. C. Loh, D. Li, Y. K. Chai, and F. Blaabjerg, “Autonomous operation of hybrid microgrid with AC and DC subgrids,” IEEE Trans. Power Electron., Vol. 28, No. 5, pp. 2214-2223, May 2013.

11.

H. Kakigano, Y. Miura, and T. Ise, “distribution voltage control for DC microgrids using fuzzy control and gain-scheduling technique,” IEEE Trans. Power Electron., Vol. 28, No. 5, pp. 2246-2258, May 2013.

12.

S. Anand and B. G. Fernandes, “Reduced-order model and stability analysis of low-voltage DC microgrid,” IEEE Trans. Ind. Electron., Vol. 60, No. 11, pp. 5040-5049, Nov. 2013.

13.

S. Grillo, V. Musolino, L. Piegari, E. Tironi, and C. Tornelli, “DC islands in AC smart grids,” IEEE Trans. Power Electron., Vol. 29, No. 1, pp. 89-98, Jan. 2014.

14.

T. Dragicevic, J.M. Guerrero, J.C. Vasquez, and D. Skrlec, “Supervisory control of an adaptive-droop regulated DC microgrid with battery management capability,” IEEE Trans. Power Electron., Vol. 29, No. 2 , pp. 695-706, Feb. 2014.

15.

L. H. Chen and F. Z. Peng, “Dead-time elimination for voltage source inverters,” IEEE Trans. Power Electron., Vol. 23, No. 2, pp. 574-580, Mar. 2008.

16.

S. N. Li, L. M. Tolbert, F. Wang, and F. Z. Peng, “Reduction of stray inductance in power electronic modules using basic switching cells,” Energy Conversion Congress and Exposition (ECCE), pp. 2686-2691, 2010.

17.

S. G. Li, L. M. Tolbert, F. Wang, and F. Z. Peng, “P-cell and N-cell based IGBT module: Layout design, parasitic extraction, and experimental verification,” in IEEE Applied Power Electronics Conference and Exposition (APEC), pp. 372-378, 2011.

18.

D. Floricau, E. Floricau, and G. Gateau. “New multilevel converters with coupled inductors: properties and control,” IEEE Trans. Ind. Electron., Vol. 58, No. 12, pp. 5344-5351, Dec. 2011.

19.

Z. Yao, L. Xiao, and Y. Yan, “Control strategy for series and parallel output dual-buck half bridge inverters based on DSP control,” IEEE Trans. Power Electron., Vol. 24, No. 2, pp. 434-444, Feb. 2009.

20.

Z. Yao, L. Xiao, and Y. Yan, “Dual-buck full-bridge inverter with hysteresis current control,” IEEE Trans. Ind. Electron., Vol. 56, No. 8, pp. 3153-3160, Aug. 2009.

21.

P. W. Sun, C. Liu, J.-S. Lai, and C.-L. Chen, “Cascade dual buck inverter with phase-shift control,” IEEE Trans. Power Electron., Vol. 27, No. 4, pp. 2067-2077, Apr. 2012.

22.

P. Sun, C. Liu, J.-S. Lai, and C.-L. Chen, “Grid-tie control of cascade dual-buck inverter with wide-range power flow capability for renewable energy applications,” IEEE Trans. Power Electron., Vol. 27, No. 4, pp. 1839-1849, Apr. 2012.

23.

P. Sun, C. Liu, J. Lai, C. Chen, and N. Kees, “Three-phase dual-buck inverter with unified pulsewidth modulation,” IEEE Trans. Power Electron., Vol. 27, No. 3, pp. 1159-1167, Mar. 2012.

24.

C. Liu, P. Sun, J.-S. Lai, Y. Ji, M. Wang, C.-L. Chen, and G. Cai, “Cascade dual-boost/buck active-front-end converter for intelligent universal transformer,” IEEE Trans. Ind. Electron., Vol. 59, No. 12, pp. 4671-4680, Dec. 2012.

25.

X. Zhang, C. Yao, F. Guo, and J. Wang, “Optimal operation and burst-mode control for improving the efficiency of the quasi-switched-capacitor resonant converter,” Energy Conversion Congress and Exposition (ECCE), pp. 5444-5450, 2014.

26.

D. Vasic, Y.-P. Liu, F. Costa, and D. Schwander, “Piezoelectric transformer-based DC/DC converter with improved burst-mode control,” Energy Conversion Congress and Exposition (ECCE), pp. 140-146, 2013.