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.
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)
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.
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