Control of Grid-Following Inverters Under Unbalanced Grid Conditions

This paper proposes a new control scheme to eliminate the 3rd harmonic in the output currents of grid-following inverters under unbalanced grid conditions. Unbalanced grids adversely affect the performance of grid-following inverters due to the oscillations appearing on the DC-link voltage with a fr...

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Bibliographic Details
Published in:IEEE transactions on energy conversion 2020-03, Vol.35 (1), p.184-192
Main Authors: Zarei, Seyed Fariborz, Mokhtari, Hossein, Ghasemi, Mohammad Amin, Peyghami, Saeed, Davari, Pooya, Blaabjerg, Frede
Format: Article
Language:English
Subjects:
Active control
Active filters
Asymmetrical short circuit faults
Capacitors
DC-link voltage control
grid-following inverters
Harmonic analysis
Harmonic distortion
instantaneous active reactive control
Inverters
output currents 3rd harmonics
Power harmonic filters
unbalanced grid conditions
Voltage control
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Summary:This paper proposes a new control scheme to eliminate the 3rd harmonic in the output currents of grid-following inverters under unbalanced grid conditions. Unbalanced grids adversely affect the performance of grid-following inverters due to the oscillations appearing on the DC-link voltage with a frequency twice the line frequency. The paper is based on instantaneous active reactive control (IARC) technique due to its advantages over other existing methods. However, the presence of severe asymmetrical 3rd harmonic distortions in the inverter output currents is the main challenge with IARC method, which impairs the power quality requirements. This paper enhances the IARC scheme by proposing a 3rd harmonic elimination approach by adopting a current reference generation method using the symmetric sequence components concept. Furthermore, the proposed scheme complies with the grid code requirements by injecting the requested reactive current. Finally, the proposed approach is evaluated by theoretical and simulation analysis and validated experimentally using a hardware setup.
ISSN:0885-8969
1558-0059
DOI:10.1109/TEC.2019.2945699