Application of a sinusoidal internal model to current control of three-phase utility-interface converters
Fukuda, S.; Imamura, R.
Industrial Electronics, IEEE Transactions on
Volume 52, Issue 2, April 2005 Page(s): 420 - 426
Digital Object Identifier   10.1109/TIE.2005.843914
Summary: Three-phase voltage-source converters are used as utility interfaces. In such a case, the converter line currents are required to track sinusoidal references synchronized with the utility grid without a steady-state error. In this paper a current control method based on a sinusoidal internal model is employed. The method uses a sine transfer function with a specified resonant frequency, which is called an S regulator. The combination of a conventional proportional-integral (PI) regulator and an S regulator is called a PIS regulator. The PIS regulator ensures that the steady-state error in response to any step changes in a reference signal at the resonant frequency and 0 Hz reduces to zero. An experiment was carried out using a 1-kVA prototype of three utility-interface converters, a voltage-source rectifier, an active power filter, and static synchronous compensator. Almost perfect current-tracking performance could be observed.

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