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Ideally, the inner (the upper or lower arm) current of a modular multilevel converter (MMC) is assumed to be the sum of a dc component and an ac component of the fundamental frequency. However, this current is usually distorted and the peak/RMS value of it is increased compared with the theoretical result. This is because ac current flows through the submodule (SM) capacitors and the capacitor voltages...
This paper presents a novel control method for PWM boost rectifier based on instantaneous power. Unlike most of the existing control strategies implemented in synchronous or p-q (active-reactive power) frame, the proposed method can provide unity power factor on the AC side in stationary frame. Rotating transformation and phase detection are eliminated, offering a very simple solution. Based on the...
For voltage source inverter (VSI) based power supply with small filter inductor, the current ripple of the power switch is large especially under light load conditions. The dead-time effect in this situation is analyzed in this paper. The results show that the dead-time effect is eliminated at most zero-crossing instants of the current. Conventional dead-time compensation methods either average voltage...
In this paper, a novel hybrid modulation method is presented based on the analysis of the existing modulation method, the phase-shifted PWM modulation and the level-shifted PWM modulation. The novel modulation is best fitted for the active power filter based on the cascaded H-bridge converter. Itpsilas supported by the simulation with Matlab/Simulink. The simulation results show that the efficiency...
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