SHE-PWM technique in a Cascaded H-Bridge Multilevel Inverter fed by High-Frequency Isolated DC-DC Converter for fuel cell application

Nowadays, improving the voltage quality has gained more attention with the widespread adoption of distributed generation (DG) systems such as photovoltaics (PV) panels, fuel cells, and wind turbines. This paper presents high-quality voltage requirements for systems fed by the fuel cell. In renewable energy-based sources, the inverter is generally employed to provide an AC voltage with a desirable amplitude to meet the requirements of the load and transmission system due to generating a high-quality voltage with less distortion. This paper proposes a structure composed of fuel cells in which the modularity is improved, and the cost of passive filter elements is reduced. Such a topology is functional in applications where the total harmonic distortion (THD) index is essential. This work proposes a method for regulating the DC-link to improve the quality of the output voltage. The SHE method solved by the Particle Swarm Optimization (PSO) algorithm in the H-Bridge 5 level inverter (CHB) has been studied to demonstrate the validity of the proposed idea.