A 17-Level Switched Voltage Source Multi-Level Inverter Topology with Low-Switching Frequency Control

摘要

Higher number of output voltage level has always been preferred in multi-level inverter configurations due to its associated advantages: low output waves' distortion, low-value filter components, etc. Series expansion to desired number of output voltage level is possible in conventional multi-level inverter topologies, but at increased power circuit component count and complexity. This article proposes a 17-level switched voltage source multi-level inverter topology that reduces the component count in 3-Φ multi-level inverter configurations. The switching sequences ensure minimum number of switching transitions among the constituted power switches. A comparison between the proposed inverter configuration, classical cascade H-bridge inverter, and some of the recent developed multi-level inverter topologies shows reduction in the power circuit devices in the proposed inverter. Appropriate modulation scheme is employed for low switching frequency operation of the proposed inverter topology. Implementation of optimum switching angles on the proposed inverter topology results in low total harmonic distortion values in the phase and line voltage waveforms. Simulation and experimental verifications are carried out on the proposed inverter topology for a resistive-inductive load; corresponding results are presented.