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Xuning Zhang,Dushan Boroyevich,Rolando Burgos 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper presents a hybrid modulation method to limit the neutral point (NP) voltage ripple and reduce the requirement for dc link capacitors during the startup process for three level motor drive systems. The neutral point voltage calculation model is presented to study the large NP voltage ripple for three level modulation during the startup process. Moreover, the possible overvoltage issue on the semiconductors considering the different switching speed of the devices for two level modulation in three level NPC converters is analyzed in detail. To avoid such overvoltage on the semiconductors, zero neutral point voltage ripple modulation (ZNPVR) method is proposed to limit the NP voltage ripple when the output fundamental frequency is low. The implementation method of the proposed method is discussed in detail. When the output fundamental frequency is high, the modulation can smoothly transit to normal NTSV modulation for lower current ripple and higher efficiency. Both simulation and experimental results are shown to verify the analysis based on a 3 kW three level VSI dc-fed motor drive system.
Jin Li,Jinjun Liu,Dushan Boroyevich,Paolo Mattavelli,Yaosuo Xue 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper analyzes and compares three-level diode neutral-point-clamped zero-current-transition (DNPC-3L ZCT) inverter and three-level active neutral-point-clamped zero-current-transition (ANPC-3L ZCT) inverter. The two multilevel soft-switching topologies are compared with respect to switching energy, volume, as well as parasitic inductance influence. The comparison results reveal that the ANPC-3L ZCT inverter takes advantage over DNPC-3L ZCT inverter with lower volume, lower switching losses, and less sensitivity to parasitic inductance. 80 kVA half-bridge prototypes of the two soft-switching topologies are implemented and tested; the experimental results verify the analysis.
Sungjae Ohn,Nidhi Haryani,Rolando Burgos,Dushan Boroyevich 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
An adoption of SiC device brings benefits on performances of three-phase photovoltaic (PV) inverters. As the switching loss of SiC devices is concentrated at a turn-on instant, triangular conduction mode (TCM) can be utilized to achieve zerovoltage switching (ZVS) for SiC-MOSFETs thus minimizing the switching energy. When the three-phases are coupled through a neutral point of the load, the dynamics of three-phases interact with each other. Such a coupling complicates conventional current-control methods based on a single-phase TCM inverter to be extended to the three-phase applications. In this paper, a simplified digital closed-loop control for three-phase TCM inverter has been presented. A new reference frame has been proposed based on the conduction-mode with a simple conductionmode decision method. Issues for the current control on the proposed reference frame are identified, and an architecture for the current controller has been investigated. The proposed control architecture has been experimentally verified with three-phase three-level 40 kW PV inverter with a digital control board with TMS320F28343.