Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 31, Issue 8, Pages 5524-5537Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2015.2493103
Keywords
Circulating current; microgrid; parallel-connected inverters; reactive power sharing; resistive-capacitive virtual impedance; resonance
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Funding
- National Natural Science Foundation of China [51577056, 51237003]
- Fundamental Research Funds for the Central Universities
- International Cooperation Program of China [2013DFB60250]
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In this paper, an inverter using resistive-capacitive output impedance (RC-type inverter) is proposed not only to provide fast reactive power sharing to support microgrid voltage, and but also to reduce circulating currents and damp high-frequency resonances among inverters. Introducing the RC virtual impedance loop, the inverter provides fast transient response. Based on the RC-type inverter modeling, the comparative frequency-domain analysis of equivalent output impedances is discussed, and the impact of the virtual complex impedance over the circulating currents and high-frequency resonances among parallel inverters is quantitatively analyzed. The control parameters are systematically selected, and effect of virtual complex impedance on the inverter output voltage is depicted. The RC-type inverter can reduce circulating currents and damp resonances due to different equivalent output impedances of inverter, and line impedances. Simulation and experimental results verify the effectiveness of the proposed method.
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