PROCEEDINGS OF THE RUSSIAN HIGHER SCHOOL
ACADEMY OF SCIENCES

Abstract
In this paper proposes a new topology quasi-Z-source inverter is proposed. This new topology allow to stand-alone power system to operate at idle without ballasting load. The application of pulse boost converters and quasi-Z-source converters in the stand-alone power systems with renewable energy sources is presented. There is a description of quasi-Z-source inverter operating at low load and idle issue. The topology solution to this problem for three-phase two-level quasi-Z-source inverter and three-phase three-level quasi-Z-source inverter is based on the same solution for Z-source converters. There are the ratios for voltage and current stresses of additional components are derived. The new topology of quasi-Z-converter requires a new control method, but it is the same as for Z-source inverter modified topology. The simulation and experimental verification of new topology were conducted. Also the new topology was compared with conventional quasi-Z-source inverter by output and efficiency characteristics. In conclusion there are advantages and disadvantages of topology proposed compared with conventional topology.

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