Switching loss and THD analysis of modular multilevel converter with different switching frequency

The usage of solar photovoltaic (PV) system in grid connected system becomes more popular nowadays. The major problem in using solar PV system is its instability and dependence of output energy. In order to stabilize the energy output and to get the smoothened profile, the power converter must be connected to the output of the PV panel. For this purpose the modular multilevel converter (MMC) is considered in this work. Moreover the system will not require a line frequency transformer due to the high voltage and high power capacity of MMC. The modular multilevel converter is considered due to this high efficiency and low harmonic distortion. The filters are connected between the converter and network to make the system efficient with no oscillation at the output side. The switching loss and total harmonic distortion (THD) is analyzed for different frequency. The simulation is carried out using MatLab and the results are presented. The results are verified experimentally.