Electricity consumption is rising at load centers these days, despite the fact that generation may be located far away. High-voltage DC system is one good option for transporting electrical energy across large distance. Self-commutated converters are the best choice for comparatively weak grids since they allow for grid stabilization in the event of faults by injecting reactive power. Modular multilevel converters (MMC) meet all needs at high voltages, such as 400 kV. MMCs are the most recent advancement in the multicell converter family. Half bridge (HB) and full bridge (FB) submodules are widely used MMC submodules. This research utilizes HB submodules for MMC. The essential terms and equations of the MMC have been presented throughout the control loop. The effect of sampling frequency on MMC performance has also been investigated, as has the relationship between sampling frequency, total harmonic distortion (THD), number of output voltage levels. The variety of modulation techniques have been investigated. MATLAB/Simulink model of MMC is presented. Using phase-shifted carrier pulse width modulation (PSC-PWM), current, voltage, and voltage harmonics were analyzed, and it is concluded that using PSC-PWM method, reduced THD level to 19.5% is obtained as compared to LSC-PWM (level-shifted carrier pulse width modulation) methods for the same HVDC scheme of transmission.