Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/8338
Title: Full feedforward of grid voltage for grid-connected inverter with LCL filter to suppress current distortion due to grid voltage harmonics
Authors: Wang, X
Ruan, X
Liu, S
Tse, CK 
Keywords: Damping resonance
dual-loop control
feedforward
LCL filter
total harmonic distortions (THD)
Issue Date: 2010
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on power electronics, 2010, v. 25, no. 12, 5580125, p. 3119-3127 How to cite?
Journal: IEEE transactions on power electronics 
Abstract: The grid-connected inverter with an LCL filter has the ability of attenuating the high-frequency current harmonics. However, the current distortion caused by harmonics in the grid voltage is difficult to be eliminated. Increasing the loop gain can reduce the current distortion, but this approach is compromised by the system stability requirement. Without increasing the loop gain, applying feedforward of the grid voltage can suppress the effect of grid voltage harmonics. This paper proposes the feedforward function of the grid voltage for the grid-connected inverter with an LCL filter. Specifically, the proposed feedforward function involves proportional, derivative, and second derivative of the grid voltage, and can be simplified according to the dominant harmonics in the grid voltage. The proposed feedforward scheme can effectively suppress the current distortion arising from the grid voltage harmonics, and the steady-state error of the injected current can be substantially reduced even if a conventional proportional and integral regulator is applied. A 6-kW experimental prototype has been tested to verify the effectiveness of the proposed feedforward scheme.
URI: http://hdl.handle.net/10397/8338
ISSN: 0885-8993
EISSN: 1941-0107
DOI: 10.1109/TPEL.2010.2077312
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