Modified Carrier-Based Control Strategy to Reduce Switching Losses in Single-Phase Quasi-Impedance Source Inverters

Energy production with minimum losses is becoming increasingly crucial today due to factors such as production costs and the decline of fossil resources. This situation has brought forth a critical issue of delivering energy to end-users in the most efficient way. In this perspective, inverters play a significant role in converting energy generated from direct current (DC) power sources such as fuel cells, batteries, and photovoltaic energy into usable form for end-users (AC). Similarly, to achieve AC regulations and requirements in photovoltaic systems, control structures enabling the extraction or regulation of maximum power require two or three-stage systems such as buck, boost and buck boost converters and inverters. Impedance-source inverters, known for their ability to provide maximum power from photovoltaic panels with a single stage and deliver energy to end-users, offer advantages over traditional inverters and utilize the widely used carrier-based switching structure known as "Simple Boost Control". In this study, a new carrier-based switching structure has been designed for impedance-source inverters to reduce the number of switching transactions and associated switching losses. Drawing inspiration from the "Simple Boost Control" structure, this study reduced the number of switching by 66% by using a new signal parallel to the existing carrier signal. Although there is a difference in the harmonic frequencies in the output voltage, there is no change in the total harmonic distortion (THD). As a result, this method reduces switching losses in circuit switching elements, demonstrating the potential to enhance the efficiency of impedance-source inverters.