| Abstract: | This paper presents a zero‐voltage‐switching modular equalization for series super‐capacitor string in a large energy storage system. The zero‐voltage working scheme is analyzed based on Power Simulation (PSIM) to verify its validity. An equalization system test for 16‐super‐capacitor cells is conducted under voltage‐imbalanced conditions. The power flow model, switching patterns, and zero‐voltage gap are discussed. The simulation and experimental results are presented, indicating that the equalization not only inherits the advantages of traditional inductor‐based super‐capacitor equalization system, but also brings some merits, such as flexible, low switching loss, and highly modularized. |
