Interconnection and damping assignment passivity-based controller for cascaded H-bridge multilevel inverter

This paper presents an interconnection and damping assignment passivity-based controller (IDA-PBC) for Cascaded H-bridge Multilevel Inverter (CHMI). The main objective of this paper is to investigate the output voltage waveform regulation with low harmonic distortion. The circuit is modeled as a port-controlled Hamiltonian (PCH) system through average modeling. IDA-PBC is capable to regulate the voltage during various loading condition. The proposed control scheme is compared to the conventional double-loop PI controller and verified by detailed simulation analysis using MATLAB-Simulink software. Simulation results show that the proposed algorithm ensures fast response time and stability of the system during load change while maintaining low harmonic distortion.