Modular Multilevel Converter for Renewable System Towards THD Mitigation

Reconfigurable property, flexibility and simplicity in operation of Modular Multilevel Converter (MMC) have attained great importance in the research field. Since, it functions at Low frequency, the performance of the converter gets enhanced. Moreover, many techniques has been implemented for reducing the harmonic contents in MMC. In proposed work, a novel technique is introduced for mitigating the harmonic issues in MMC. The output from the photovoltaic system (PV) is given to the voltage stabilizer, which balances the voltage and gives it to the High Frequency Converter (HFC) of the MMC. Low frequency DC is converted by the HFC converter into high frequency DC, which is then fed to the Low Frequency Converter (LFC), which changes the high frequency DC into low frequency AC before being delivered to the grid. The P&O greatest Power Point Tracking (MPPT) algorithm is implemented to monitor PV panel's greatest power output. PI controller based closed loop technique is used to regulate MMC and achieve grid synchronisation. To evaluate the proposed work's effectiveness, MATLAB/Simulink is employed to implement it. Using the defined work, better reduction of THD is achieved.