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One problem with a single-voltage source, three-level inverter is the drafting of its neutral-point voltage. This may occur during transition or when unbalanced loads are connected to the inverter system. Variation of neutral-point voltage may greatly deteriorate the power quality. In this paper, we employ an equivalent-input-disturbance approach to deal with this problem. By adding an extra neutral...
This paper presents an application of a two-dimensional continuous/discrete model based repetitive control method in voltage control of DC/AC inverters. The control objective is to suppress harmonic distortion, ensure high quality sinusoidal voltage output. Total harmonic distortion(THD) is one of the main criteria to evaluate power quality, it should be kept as small as possible. Modeling of the...
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