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Technical Lecture

Photovoltaic (PV) Inverters and Micro Inverters

T13.7 - Resilient Operation for Grid-Connected Cascaded H-Bridge Multilevel Inverter with Improving PV Source Stress

Wednesday, March 19, 2025
11:00 AM – 11:20 AM ET
Location: Level Three, A316
Recent advancements in resilient power system operations increasingly leverage photovoltaic (PV) and grid-connected converter systems, with cascaded H-bridge multilevel inverters being particularly well-suited for high-power applications. However, unbalanced conditions frequently arise due to faulty submodules, which are often exacerbated by extreme weather. While redundant submodules are commonly employed to mitigate these issues, they introduce additional failure points and increase costs. This paper addresses unbalanced grid currents caused by faulty submodules in cascaded H-bridge multilevel inverters using a source stress-improved control strategy based on the neutral offset approach. When a submodule is bypassed due to faults or hot-swapping, all remaining submodules, across both normal and faulty phases, share the voltage lost from the bypassed submodule. By distributing the voltage contribution across all submodules in both faulty and non-faulty phases, this method reduces system costs and downtime wh