Conference PaperA Control Scheme Based on Lyapunov Function for Cascaded H-Bridge Multilevel Active RectifiersJean-Pierre, Garry; Altin, Necmi; Shafei, Ahmad El; Nasiri, AdelnullThe cascaded H-bridge multilevel active rectifier is a prominent converter configuration. It presents compelling advantages, including high adjustability for a number of applications, such as in solid-state transformers, traction applications, medium and high power motor drives and battery chargers. However, when the H-bridge is operating under an unbalanced load and asymmetrical voltage conditions, it becomes important to design advanced control strategies to maintain the stability of the system. In this study, a Lyapunov-function based control method is proposed for controlling the single-phase cascaded H-bridge active rectifier to achieve global asymptotic stability. A capacitor voltage feedback is added to the conventional Lyapunov-function based stabilizing control method to minimize the resonance of the LCL filter. Additionally, a Proportional-Resonant (PR) control approach is adopted to obtain the reference current signal. This increases the robustness of the current control scheme. A DC voltage balancing control procedure is also employed to prevent the unbalanced DC voltage conditions among the H-bridges. The DC voltage is controlled via a PI controller. The capability of the control approach is verified with simulation and experimental studies.2020-03-01102213892020 IEEE Applied Power Electronics Conference and Exposition (APEC)2021 to 2026https://doi.org/10.1109/APEC39645.2020.91242341939124National Science Foundation