Please use this identifier to cite or link to this item: http://localhost/handle/Hannan/192937
Title: Resonance Interaction of Multiparallel Grid-Connected Inverters With LCL Filter
Authors: Minghui Lu;Xiongfei Wang;Poh Chiang Loh;Frede Blaabjerg
Year: 2017
Publisher: IEEE
Abstract: This letter investigates the resonance characteristics and stability problem caused by the interactions of multiparallel LCL-filtered inverters. Compared to single grid-connected inverter, the multiinverter system presents a more challenging resonance issue, where the inverter interactions may excite multiple resonances at various frequencies. This letter proposes a modeling and analysis method based on the current separation scheme. It reveals that an interactive resonant current that circulates between the paralleled three-phase inverters may arise, depending on the current distribution and the system resonance characteristics. This is different from the common resonant current injected into the grid and has yet been discussed before. The analysis with the root loci in the discrete z-domain are carried out with two stability constraints identified, which correspond to the conditions of triggering the interactive resonant current and common resonant current, respectively. Simulations and experimental results verify the theoretical analysis.
URI: http://localhost/handle/Hannan/192937
volume: 32
issue: 2
More Information: 894,
899
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7501530.pdf2.02 MBAdobe PDF
Title: Resonance Interaction of Multiparallel Grid-Connected Inverters With LCL Filter
Authors: Minghui Lu;Xiongfei Wang;Poh Chiang Loh;Frede Blaabjerg
Year: 2017
Publisher: IEEE
Abstract: This letter investigates the resonance characteristics and stability problem caused by the interactions of multiparallel LCL-filtered inverters. Compared to single grid-connected inverter, the multiinverter system presents a more challenging resonance issue, where the inverter interactions may excite multiple resonances at various frequencies. This letter proposes a modeling and analysis method based on the current separation scheme. It reveals that an interactive resonant current that circulates between the paralleled three-phase inverters may arise, depending on the current distribution and the system resonance characteristics. This is different from the common resonant current injected into the grid and has yet been discussed before. The analysis with the root loci in the discrete z-domain are carried out with two stability constraints identified, which correspond to the conditions of triggering the interactive resonant current and common resonant current, respectively. Simulations and experimental results verify the theoretical analysis.
URI: http://localhost/handle/Hannan/192937
volume: 32
issue: 2
More Information: 894,
899
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7501530.pdf2.02 MBAdobe PDF
Title: Resonance Interaction of Multiparallel Grid-Connected Inverters With LCL Filter
Authors: Minghui Lu;Xiongfei Wang;Poh Chiang Loh;Frede Blaabjerg
Year: 2017
Publisher: IEEE
Abstract: This letter investigates the resonance characteristics and stability problem caused by the interactions of multiparallel LCL-filtered inverters. Compared to single grid-connected inverter, the multiinverter system presents a more challenging resonance issue, where the inverter interactions may excite multiple resonances at various frequencies. This letter proposes a modeling and analysis method based on the current separation scheme. It reveals that an interactive resonant current that circulates between the paralleled three-phase inverters may arise, depending on the current distribution and the system resonance characteristics. This is different from the common resonant current injected into the grid and has yet been discussed before. The analysis with the root loci in the discrete z-domain are carried out with two stability constraints identified, which correspond to the conditions of triggering the interactive resonant current and common resonant current, respectively. Simulations and experimental results verify the theoretical analysis.
URI: http://localhost/handle/Hannan/192937
volume: 32
issue: 2
More Information: 894,
899
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7501530.pdf2.02 MBAdobe PDF