Fault-resilient Control Strategy for Cascaded Multilevel Inverters in Grid-connected PV Systems

Abstract

This paper presents a fault-tolerant control strategy for a three-phase, seven-level Cascaded Multilevel Inverter (CMI) in grid-connected photovoltaic (PV) systems. The proposed approach enhances state-of-the-art CMI fault-tolerant control by integrating advanced compensation techniques, combining fault isolation and compensation, and conducting a comprehensive system analysis under fault conditions. The study focuses on improving power quality and system robustness, making it particularly suitable for modern grid-tied renewable energy applications. Compared to previous works, this research offers notable advances in power quality, system reliability, and fault resilience. Key innovations include optimizing the use of renewable energy in large-scale solar installations through multilevel inverter technology and addressing operational faults to ensure uninterrupted power delivery. The findings underscore the significance of robust fault-tolerant strategies in improving the performance and stability of renewable energy systems.