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A Novel Kalman Filter Supported Current Control Scheme for Grid Connected Power Converter Applications

A Novel Kalman Filter Supported Current Control Scheme for Grid Connected Power Converter Applications
Autor:

Philip Grabherr, Matthias Köder, Stefan Weiß, Michael Braun

Quelle:

PCIM Asia 2014, Shanghai, China

Datum: 17. - 19.6.

Abstract

In low-voltage grid applications with increasing decentralized sources, it is necessary to provide the technical facilities to sustain power quality and subsequently grid stability on-site. Therefore, it is reasonable to assign these tasks in particular grid sectors to the also increasing quantity of power converters.
This paper presents a novel control strategy for injecting positive and negative sequence currents into the grid to compensate unbalanced voltage level situations. The proposed control scheme allows to control each converter phase stand-alone. Kalman Filters are used to provide estimated current values in a rotating reference frame for each phase. The performance of the filter process in a closed control loop is demonstrated with a laboratory converter.