Grid-connected high-power inverters are often
used in distributed generation and power quality systems. Those
inverters have to handle high currents in order to achieve high
power values without resorting to higher voltages. Connecting
inverter legs in parallel is a proper way to achieve such high
currents. Such parallel connection is made by means of
inductors and achieving balanced currents among the legs
becomes a critical issue. Circulating currents may produce
additional losses and stress to the converter’s power devices.
Therefore, they should be controlled and minimized. An
efficient technique to achieve such balance is presented in this
paper. The proposed strategy has been developed on a gridconnected
three-phase system. Each phase of the inverter is
made up of three legs in parallel. Besides, the control
implemented in this work allows full regulation of the power
factor. This way, any desired power factor value can be
achieved in order to meet grid-connection requirements.
Simulation and experimental results are shown in this paper.
CitationCapella, G. [et al.]. Parallel-connected legs in a grid-tied inverter system for distributed generation. A: International Conference on Renewable Energies and Power Quality (ICREPQ). "ICREPQ 2011". Las Palmas de Gran Canaria: 2011, p. 1-6.
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