Voltage Ripple Suppression Methods for the Capacitor in Modular Multilevel Converter Submodules Employing a Reversed Pulse Width Modulation-Switching Channel

Modular multilevel converters (MMCs) will be widely applied in onboard integrated power systems due to their high levels of electric output and good-quality sine waveform outputs. However, the capacitor voltage MMCs fluctuates greatly because charge–discharge process is continuous when system working. In order reduce ripples efficiently, a ripple-suppression strategy employing reversed PWM switching channel proposed this paper. For one pair upper lower arm submodules, built. Then, highest ripple possible can offset since fluctuation direction capacitors would reversed. addition, clamping added further suppress by 78%. Compared traditional large capacitance suppression methods, only 12% used method. The reliability density MMC both increased, there are no additional losses compared with previous methods. effectiveness verified simulation results.