A Robust Vector Current Controller with Negative-Sequence Current Capability for Grid-Connected Inverters

Houshang Karimi, Aboutaleb Haddadi, Masoud Karimi-Ghartemani and Mahdieh Sadabadi
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Houshang Karimi: Department of Electrical Engineering, Ploytechnique Montreal, Montreal, QC H3T 1J4, Canada
Aboutaleb Haddadi: Electric Power Research Institute (EPRI), Palo Alto, CA 94304, USA
Masoud Karimi-Ghartemani: Department of Electrical and Computer Engineering, Mississippi State University, Starkville, MS 39762, USA
Mahdieh Sadabadi: Department of Automatic Control and Systems Engineering, University of Sheffield, Sheffield S1 3JD, UK

Energies, 2021, vol. 14, issue 15, 1-22

Abstract: This paper presents a vector current controller (in the synchronous reference, or the dq, frame) with negative-sequence current injection capability for three-phase grid-connected converters. This capability is desired for the operation of the converter during unbalanced conditions and also for a certain type of islanding detection. The proposed controller first determines the double-frequency current references and then uses a sixth-order two-input two-output proportional-integral-resonance (PIR) structure, which is optimally designed. Compared with the existing similar approaches, the proposed controller has a simpler structure and more robust performance, e.g., against system parameter uncertainties and weak grid conditions. The proposed controller is developed for converters with both the L -type and L C L -type filters. For the L C L -type converter, a suboptimal partial state feedback control is also proposed to achieve robust stability and active damping of resonance poles without requiring additional sensors. Detailed experimental results are presented to illustrate the properties and performances of the proposed controller.

Keywords: vector current control; distributed energy resources; grid-connected inverter; negative-sequence current injection; islanding detection (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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