Carrier-Based Modulation Technique to Reduce Low Frequency Ripple at the Partial Dc-Link Voltages of a Three-Level/-Phase/-Wire NPC Converter Applied to Future Dc Bipolar Active Distribution Networks
Conference: PCIM Europe 2016 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
05/10/2016 - 05/12/2016 at Nürnberg, Deutschland
Proceedings: PCIM Europe 2016
Pages: 8Language: englishTyp: PDF
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Authors:
Moia, Joabel (IFSC – Federal Institute of Santa Catarina, Eletronics Department, Florianópolis, SC, Brazil)
Heldwein, Marcelo L. (UFSC – Federal University of Santa Catarina, Power Electronic Institute (INEP), P.O. box: 5119, 88040-970, Florianópolis, SC, Brazil)
Abstract:
This work proposes a modulation technique for a three-phase/-wire/-level Neutral Point Clamped converter (NPC) aiming to reduce low frequency (LF) neutral point current components in future dc bipolar distribution network applications. The technique is based on the analysis of three-level converters in the abc reference frame, where the ac measured currents and duty-cycle signals are used to calculate the 0-axis duty-cycle, which ensures that the capacitor dc-link LF current components are eliminated, even when loads/microgeration units inject LF currents to the network central line. Simulation results validate the proposed technique.