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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 an advanced voltage control method for voltage-controlled current source inverter(VC-CSI) with nonlinear loads. The proposed technique adopts the proportional sinusoidal signal integrator (PSSI) controller to achieve a rather good voltage tracking ability under nonlinear load conditions, which can be implemented directly in the stationary alphabeta frame with no need of the rotating...
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...
Static power converters are used for many applications, like frequency converters for motors, uninterruptible power supplies(UPS's), general power supplies, and also with ground power units(GPU) for airplanes. This paper analyses the performance of high power static 400 Hz supply system. In such a system, the topology is a three single- phase H-bridge inverter with a multi-limb output transformer...
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