Cascaded Current-Voltage Control to Improve the Power Quality for a Grid-Connected Inverter With a Local Load

In this paper, a cascaded current-voltage control strategy is proposed for inverters to simultaneously improve the power quality of the inverter local load voltage and the current exchanged with the grid. It also enables seamless transfer of the operation mode from stand-alone to grid-connected or v...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) Vol. 60; no. 4; pp. 1344 - 1355
Main Authors: Qing-Chang Zhong, Hornik, T.
Format: Journal Article
Language:English
Published: New York IEEE 01.04.2013
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Balancing
Bridge circuits
Control systems
Controllers
Electric potential
Exchanging
H^{\infty} control
Harmonic distortion
Inductors
Inverters
microgrids
Power quality
Pulse width modulation
repetitive control
seamless transfer
Strategy
Studies
Synchronization
total harmonic distortion (THD)
Voltage
Voltage control
ISSN:0278-0046, 1557-9948
Online Access:Get full text
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Summary:In this paper, a cascaded current-voltage control strategy is proposed for inverters to simultaneously improve the power quality of the inverter local load voltage and the current exchanged with the grid. It also enables seamless transfer of the operation mode from stand-alone to grid-connected or vice versa. The control scheme includes an inner voltage loop and an outer current loop, with both controllers designed using the H ∞ repetitive control strategy. This leads to a very low total harmonic distortion in both the inverter local load voltage and the current exchanged with the grid at the same time. The proposed control strategy can be used to single-phase inverters and three-phase four-wire inverters. It enables grid-connected inverters to inject balanced clean currents to the grid even when the local loads (if any) are unbalanced and/or nonlinear. Experiments under different scenarios, with comparisons made to the current repetitive controller replaced with a current proportional-resonant controller, are presented to demonstrate the excellent performance of the proposed strategy.
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ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2012.2187415