A modified CPS-PWM for capacitor voltage reduction of MMC based variable speed drive

Abstract

<span>In recent years, modular multilevel converters (MMC) have become one of the most popular multilevel converter topologies. Despite its growing popularity, MMC is still less widespread in variable speed drives (VSDs) applications. The reason for this is that the voltage ripple of the MMC submodules (SM) increases during the low-speed constant torque operation. In this paper, carrier phase shift-pulse width modulation (CPS-PWM) is modified to reduce the average voltage of SM and thus accommodate more ripples without exceeding the maximum SM voltage. The proposed method does not involve the injection of circulating current components, thereby resulting in less power loss. In addition to that, the necessity for increasing the SM capacitor rating during low-speed operation is not required. Extensive simulation has been conducted under various speed commands to validate the effectiveness of this method.</span>

Multicarrier PWM techniques for three phase modular multilevel converter application in MRI systems

“…This leads to the two forms of level-shifted PWM approaches, namely in-phase disposition and phase opposite disposition. As illustrated in Figure 6 phase disposition (IPD) level shifted PWM approach are in phase with one another between the upper and arms [13]. The output voltage waveform can have Ncell+1 level using this modulation technique.…”