A Novel Γ-Source-Based Hybrid Power Converter with Modified H-Bridge Inverter
摘要
A significant constraint of multilevel inverter (MLI) technology is the necessity for an augmented quantity of power semiconductor devices, along with the requisite gate driver circuits, to achieve a greater number of output voltage levels. Nevertheless, an increased quantity of levels corresponds to a rise in the number of switching devices, diodes, and ancillary passive components. Furthermore, this proliferation leads to heightened control complexity and introduces challenges related to voltage-impedance, rendering these multilevel inverter configurations unsuitable for elevating the output voltage level due to the excessive number of switching devices involved. To enhance the output voltage levels with the objective of attaining a superior output voltage waveform through multilevel inverter configurations, it is imperative that the aforementioned issues be addressed in advance. In this study, a topology is proposed that necessitates a reduced number of direct current (DC) voltage sources and power switches, while also incorporating lower blocking voltage ratings on the switches, which collectively contribute to a reduction in complexity and overall inverter cost. This proposed inverter architecture comprises two DC input sources; one terminal is connected to a Γ-source derived from a fuel cell, while the other terminal is powered by solar energy. The impedance network of this Γ-source is optimized, with its gain improving in accordance with an increased turns ratio, thereby enhancing the circuit's performance.