Fault tolerant hybrid cascaded nine level multi-level inverters for grid connected applications

Abstract A novel hybrid cascaded H-bridge (CHB) inverter topology is proposed for renewable energy applications, featuring enhanced fault tolerance. By integrating a nine-level boost switched-capacitor module with H-bridge modules, the design ensures reliable operation under faults affecting semiconductor switches or DC power supplies. The topology offers additional benefits, including voltage boosting of four and self-balancing of switched capacitors. Simulation and experimental results validate the proposed inverter’s performance under various operating conditions, demonstrating its potential for robust and efficient renewable energy systems.