Modular Filter Building Block for Modular full-SiC AC-DC Converters by an Arrangement of Coupled Inductors

Ohn, Sungjae; Phukan, Ripun; Dong, Dong; Burgos, Rolando; Boroyevich, Dushan; Mondal, Gopal; Nielebock, Sebastian

doi:10.1109/ecce44975.2020.9236309

Cited by 10 publications

(2 citation statements)

References 11 publications

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“…However, due to the intentional carrier phase errors, ZSCCs inevitably occur [14][15][16][17]. Therefore, a physical suppression method such as adding a large size filter is essential [18]. Meanwhile, if carrier phase errors occur due to the use of individual inverters, a method for reducing the ZSCCs will be required, and this condition was assumed in this paper.…”

Section: Introductionmentioning

confidence: 99%

“…The method of using the LCL filters for the outputs of individual inverters can be hardly used universally because the optimal design must vary according to the field of application. Although the circulating currents can be suppressed by controlling the circulating currents with software using active control such as proportional and integral (PI) and proportional and resonant (PR) control, it is not suitable for controlling the high frequency circulating currents in the switching frequency band due to the limitation of the control bandwidth [18][19][20][21][22][23][24][25][26]. Therefore, in order to reduce the circulating currents due to the carrier phase errors, a new appropriate control method is necessary.…”

Section: Introductionmentioning

confidence: 99%

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The Circulating Current Reduction Control Method for Asynchronous Carrier Phases of Parallel Connected Inverters

Lee

Jung

2022

Energies

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Parallel operation of inverters is one of the most effective and representative ways to increase system capacity. However, zero-sequence circulating currents occur due to the practical deviations of components constituting individual inverters in case of parallel connected inverters in which a common direct current (DC) or alternating current (AC) bus is shared. In particular, circulating currents of the high-frequency component as well as those of the low-frequency component are generated due to the asynchronization of the carriers of individual inverters. In order to suppress the circulating currents as such, the phases of the carriers should be shifted as much as the phase errors between the carriers to compensate for the phase errors. A difficulty in this phase compensation control is that when there are several pulse-width modulation (PWM) carriers, it is impossible to identify the phase of each carrier. In this paper, to overcome the problem, a method to specify the position of one of the many carriers and control the carriers and compensate for phase errors based on the relevant phase was proposed. In addition, this paper includes the analysis of circulating currents generated in the case of carrier phase errors and proposes a method to identify carrier phase errors and compensate for the relevant errors. The proposed method was verified through simulations and experiments.

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