This paper proposes a novel step-up DC/DC converter with galvanic isolation -the quasi-Z-source inverter (qZSI) based DC/DC converter and discusses three different shootthrough PWM control methods suitable for this topology. The proposed converter is meant for applications where the wide range of voltage gain is demanded, e.g. with renewable energy sources (fuel cells, photovoltaic cells), in telecom, aerospace and some other applications. For the verification of theoretical assumptions the converter prototype was assembled and tested. Experimental waveforms of the converter operated with different shoot-through PWM control methods are compared and discussed. Design considerations for converter and different control signal generators are provided. Keywords-DC/DC converter, quasi-Z-source inverter (qZSI), control method, pulse-width modulation (PWM), isolation transformer, gating signal generatorI.

In this paper four new extended boost qZSIs with continuous input current were presented, analyzed and compared. Moreover, some problematic issues of these converters were pointed out and discussed. Theoretical background was verified by the simulations and experiments. Ill. 14, bibl. 9, tabl. 1 (in English; abstracts in English and Lithuanian).

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This paper presents a new converter topology for interfacing a permanent magnet synchronous generator based variable speed wind turbine with a residential power network. Analysis of the converter topologies studied earlier shows that they are not well suited for PMSG with low output voltage. PMSG characteristics are discussed in order to formulate requirements for a power converter. A new topology of an interfacing converter is analyzed and simulation results of a lossless model are presented. Simulation results of the proposed converter prove that its utilization in wind power applications is beneficial. The results of performance tests demonstrate the SL qZSI ability to ensure the required sinusoidal output voltage at all operation modes of PMSG-based WSVT. Ill. 15, bibl. 9, tabl. 1 (in English; abstracts in English and Lithuanian). L. Bisenieks, D. Vinnikov, S. Ott. Besikeičiančio induktyvumo keitiklio qZS taikymas kintamo greičio vėjo jėgainėse // Elektronika ir elektrotechnika.-Kaunas: Technologija, 2011.-Nr. 8(114).-P. 61-66. Pateikiama nauja keitiklio topologija. Atlikus tyrimus nustatyta, kad esami keitikliai nėra tinkami. Ištirtos PMSG charakteristikos, ir jas apibendrinus iškelti nauji reikalavimai keitikliui. Pateikti modeliavimo rezultatai. Il. 15, bibl. 9, lent. 1 (anglų kalba; santraukos anglų ir lietuvių k.).

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