Single-Phase AC/AC Buck-Boost Converter with Single-Phase Matrix Topology

 ABSTRACT:

This paper deals with a new family of single-phase AC/AC buck-boost converter based on singlephase matrix topology. The proposed converter provides a wider range of output AC voltage in which the output voltage can be bucked and in-phase/out-of-phase with the input voltage; and the output voltage can be boosted and in-phase/out-of-phase with the input voltage. A commutation strategy is employed to realize snubberless operation. The operating principles, circuit analysis and experimental results based on TMS320F2812 DSP are presented.

KEYWORDS:

1.       Z-source converter

2.       Single-phase matrix converter (SPMC)

3.      PWM AC/AC converter

SOFTWARE: MATLAB/SIMULINK

 BLOCK DIAGRAM:

Fig. 1: Proposed topology.

 EXPECTED SIMULATION RESULTS:

(a) Buck in-phase

                                                                                (b) Buck out-of-phase

Fig. 2: Experimental results for buck mode with Vi = 70 Vrms/60Hz, D = 0.3. (a) Region (I) (buck inphase).

(b) Region (III) (buck out-of-phase). Top: vi; Bottom: vo. (x-axis: 10ms/div., y-axis: 100V/div)

(a) Boost in-phase

(b) Boost out-of-phase

Fig. 3: Experimental results for boost mode with Vi = 50 Vrms/60Hz, D = 0.7. (a) Region (II) (boost

in-phase). (b) Region (IV) (boost out-of-phase). Top: vi; Bottom: vo. (x-axis: 10ms/div., y-axis:

100V/div)

CONCLUSION:

In this paper a new family of single-phase Z-source AC/AC buck-boost converter based on singlephase matrix converter topology has been presented. The proposed converter has following fertures:the output voltage can be bucked-boosted and in-phase with the input voltage; the output voltage can be bucked-boosted and out-of-phase with the input voltage. In order to provide a continuous current path, the safe-commutation strategy is employed. Steady-state analysis and experimental results were illustrated. By duty-ratio control, the proposed converter becomes “solid-state transformers” with a continuously variable turn ratio. The proposed converter can be used as dynamic voltage restorer (DVR) to compensate voltage sags and swells in AC/AC line conditioning without any energy-storage devices requirement. The feature which the output voltage is bucked-boosted and in-phase with the input voltage is used for voltage sag compensation. The feature which the output voltage is bucked boosted and out-of-phase with the input voltage is used for voltage swell compensation.

REFERENCES:

[1] Fang X. P., Qian Z. M., Peng F. Z.: Single-phase Z-source PWM AC-AC converters, IEEE Power Electronics Letters, vol. 3, no. 4, 2005, pp. 121-124.

[2] Tang Y., Xie S., Zhang C.: Z-source AC-AC converters solving commutation problem, IEEE Trans. Power Electronics, vol. 22, no. 6, 2007, pp. 2146-2154.

[3] Kwon B. H., Mim B. D., Kim J. H.: Novel commutation technique of AC-AC converters, IEE Proc. Electr. Power Appl., vol. 145, no. 4, July 1998, pp. 295-300.

[4] Wheeler P. W., Rodriguez J., Clare J. C., Empringham L., Weinstein A.: Matrix converter: a technology review, IEEE Trans. on Ind. Electronics, vol. 49, no. 2, April 2002, pp. 276-288.

[5] Nguyen M. K., Jung Y. G., and Lim Y. C.: Single-phase Z-source buck-boost matrix converter, in proc. Of IEEE Applied Power Electronics Conference and Exposition, APEC’09, pp. 846-850, 2009.