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This paper presents an improved DC-link voltage fast control strategy for a PWM rectifier-inverter system to reduce the fluctuation of DC-link voltage. In this paper, a conclusion is drawn based on the instantaneous energy balance analysis of the whole system that the energy stored in the DC-link capacitor will fluctuate during dynamic process in rectifier mode, even in ideal case. Then, when the...
This paper presents a predictive control scheme of DC-link voltage for back-to-back converters based on energy balance modeling. Since the variation of DC-link voltage is affected by the energy mismatch between rectifier and inverter, the energy distribution in a rectifier-inverter is analyzed. Moreover, in order to calculate the input and output energy in one control period accurately, the grid current...
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