Abstract

The modular multilevel converter (MMC) is one of the upcoming converters with a scalable technology that enables high voltage and high power capabilities. MMC construction mainly contains power electronics building blocks (PEBBs) on the upper and lower arm for each phase. PEBB consists of a capacitor, transistor and diode. As the capacitor voltage ripple of the traditional MMC is directly proportional to the output torque and inversely proportional to the motor speed, for high torque, low-speed application ripples will be high. Due to this drawback, widespread application in medium-speed motor drives has not been achieved. To overcome this, hybrid MMC has been proposed where a series switch is also introduced in traditional MMC to control the circulating current. The paper implements level shift pulse width modulation control (LSPWM) for the hybrid MMC to decrease the voltage ripple produced by the capacitor. LSPWM has been chosen in this paper mainly due to the simplicity of calculation involved with this control scheme and comparison to the other existing techniques. This control scheme also helps in the reduction of the total harmonic distortion (THD). As solar PV system is a promising green resource, the MMC can be fed by solar panels. The principle of operation of the hybrid MMC topology with LSPWM is explained in this paper. The simulation results carried out in MATLAB/Simulink verify the proposed topology.

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