NEW SWITCHING STRATEGY FOR SINGLE MODE OPERATION OF A SINGLE-STAGE BUCK-BOOST INVERTER


project center in trichy

Generally, single-stage buck-boost inverters consist of distinct circuits operating individually in buck/boost or positive/ negative modes, the latter definitely leading to crossover distortion in the output current. This paper proposes a switching strategy that changes the bi-modal operation of a single stage buck-boost topology to a single mode inverter (SMI). This is due to the consequent voltage gain which ensures that the output voltage polarity, apart from its magnitude, is an exclusive function of the duty ratio. Operational principle and salient hardware design are explained with the help of equivalent circuits. Details about the dynamic model are presented, based on which controller design is carried out for both stand-alone and grid-connected operation. Experimental results obtained from a 300 W, 110 V laboratory prototype are presented to validate the performance of the proposed switching strategy.

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