A hybrid inverter system for medium voltage applications using a low voltage auxiliary CSI
Papadopoulos, Savvas and Rashed, Mohamed and Klumpner, Christian and Wheeler, Patrick (2014) A hybrid inverter system for medium voltage applications using a low voltage auxiliary CSI. In: 2014 IEEE Energy Conversion Congress and Exposition (ECCE 2014), 14-18 Sept 2014, Pittsburgh, Pennsylvania, USA.
Hybrid converters consist of a main inverter processing the bulk of the power with poor waveform performance and a fast and versatile auxiliary inverter to correct the distortion. In this paper, the main converter is a medium voltage NPC inverter and the auxiliary inverter is a low-voltage and low- current rated current source inverter (CSI), with series capacitor being used to minimize the CSI voltage stress. The result is a high output current quality which is obtained with a very low switching stress in the main converter and a very small added installed power (<4%) in the CSI. This paper expands this concept by investigating the hybridization of a medium voltage inverter with an existing LCL filter and investigates the additional challenges related to resonances and proposes a solution for stabile operation.
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