Virtual Impedance-based Grid Synchronization for Converters Connected Through Long Cables
IEEE Energy Conversion Congress and Exposition, ECCE
This paper proposes a synchronization scheme for grid-connected Voltage Source Inverters (VSI) without physical interface inductors, voltage sensing or conventional PLL algorithms. Especially, issues with converters connected trough long cables are addressed. These cables present non-negligible LC characteristics that can lead to resonance peaks degrading current or voltage waveforms. A virtual impedance is used as grid coupling element, providing a virtualized synchronization point within software using only already available current-sensor information. Also, virtual resistance is used to actively dampen resonance peaks caused by cable characteristics. Theoretical analysis and simulation results are presented to verify the proposed strategy.
Taylor, Allan; Bauwelz Gonzatti, Robson; Zhou, Bokang; He, Yuchen; and Peng, Fang, "Virtual Impedance-based Grid Synchronization for Converters Connected Through Long Cables" (2020). Electrical & Computer Engineering Presentations And Conference Materials. 61.