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An adaptive delta-sigma modulator which can be utilized for the zero-cross switching control of resistive heaters with AC line for thermal control is proposed. By adjusting the horizon width for the cost function of the modulator control scheme according to the command signal, the modulator has both a good performance of quantum noise suppression and a wide operating range simultaneously. A numerical...
Asymmetrical cascaded multilevel converters can generate more number of voltage levels for the same number of switching devices. Binary, Trinary and other different forms are available in literature. This paper has critically investigated such converters from the point of view of optimizing the number of levels. A mathematical tool to analyze the possibility of any asymmetric ratio for various three-phase...
A new space vector modulation method for common-mode voltage reduction in four-level nested neutral point clamped (NNPC) inverter is proposed in this paper. The proposed method employs switching states with minimal absolute common-mode voltages to synthesize given reference vectors. A variety of virtual vectors are constructed to facilitate the synthesis. The effect of dead time on common-mode voltage...
This work compares multi-cell topologies based on Current Source Inverters (CSIs) which are connected in a Cascade H-Bridge (CHB), where the large DC inductor size needed to compensate the oscillating power drained by the inverter is the main drawback. In order to reduce the DC inductor size, two compensation methods which compensated the oscillating power are evaluated and compared with the basic...
There is an increasing interest in two-stage four-leg matrix converter (3×4TSMC) which provides a neutral connection for potential imbalanced loads. However, the fourth leg will worsen its operation performance unexpectedly, even if connected to the balanced loads. By means of analysis and calculation, it is found that the input filter capacitor voltage fluctuation will transfer to the output in the...
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