A New Grid Interactive 11-Level Hybrid Inverter Topology for Medium-Voltage Application
Nikhilesh Panda, Bikram Das, Abanishwar Chakrabarti, Prabir Ranjan Kasari, Aniruddha Bhattacharya, Debashis Chatterjee
Abstract
Multilevel inverter (MLI) has wide applications due to its numerous advantages. An improved configuration of eleven-level MLI suitable for medium-voltage range has been proposed in this article. The proposed topology contains two half-bridge submodules, one flying capacitor MLI, and one full bridge submodule. A simple method of capacitor voltage balancing has been demonstrated with less ripple. The study about the effectiveness of proposed MLI has been justified by loss calculation to find the efficiency and voltage ripple analysis of the capacitor. The comparative assessment in terms of switch count, driver count, capacitor requirement, device peak inverse voltage, total standing voltage (TSVp.u), cost function, etc. for the developed hybrid inverter (HI) topology has been presented to establish the utility of the proposed HI. This topology has been checked for its operation under various operating conditions, including frequency and modulation index variation, overmodulation range, and also with motor load. The grid connectivity option of the proposed HI has been verified to ensure the suitability for application with renewable energy sources.