Proportional-Resonant Controllers. A New Breed of Controllers Suitable for Grid-Connected Voltage-Source Converters

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Published Jun 30, 2006
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Vol 6 No 2 (2006): Volume 6 / 2006

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Remus Teodorescu,
Aalborg University, Institute of Energy Technolog, Dept. of power electronics and drives
Frede Blaabjerg
Aalborg University, Institute of Energy Technolog, Dept. of power electronics and drives
Marco Liserre
Polytechnic of Bari, Dept. of Electrotechnical and Electronic Eng.

Abstract

This paper is describing the recently introduced proportional-resonant (PR) controllers and their suitability for grid-connected converters current control. It is shown that the known shortcomings associated with PI controllers like steady-state error for single-phase converters and the need of decoupling for three-phase converters can be alleviated. Additionally, selective harmonic compensation is also possible with PR controllers. Suggested control-diagrams for three-phase grid converters and active filters are also presented. A practical application of PR current control for a photovoltaic (PV) inverter is also described.

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