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Considering the synthetical effects of redundant submodules and arm-asymmetric operating conditions within the modular multilevel converter (MMC), a modified mathematical model is established in this paper, and the modified switching function and the mechanism of circulating current are analyzed. On this basis, an optimized modulation strategy is proposed to minimize the fundamental component of the...
As the demand for electric power grows continuously, there are more AC and DC lines sharing the same corridor because of economic and ecological reasons. One of the problems is the induced fundamental frequency voltages and consequent circulating current on the DC lines by the coupled parallel AC lines. The LCC-MMC hybrid transmission system is quite suitable to transmit bulk power over long distance...
This paper describes a modified phase-shifted carrier-based pulsewidth-modulation (PSC-PWM) scheme for modular multilevel converters (MMC). In order to reduce the average device switching frequency, a reduced switching-frequency (RSF) voltage balancing algorithm is developed. This paper also proposes a circulating current suppressing controller (CCSC) to minimize the inner circulating current in an...
A circulating current suppressing controller (CCSC) is presented to eliminate the inner balancing currents in modular multilevel converter (MMC). Based on the double-fundamental-frequency, negative-sequence rotational frame, the three phase alternative circulating currents are decomposed to two DC components, and are limited to a low level by a pair of proportional integral controllers. This control...
This paper describes two distinctive functions of the arm inductor in the modular multilevel converters (MMC): suppressing the circulating current and limiting the fault current rise rate. Based on the equality of the instantaneous power, the characteristics of the circulating current are analyzed and demonstrated that it flows through the three phase of the converter in negative sequence at double-fundamental...
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