Impedance-Based Interactions in Grid-Tied Three-Phase Inverters in Renewable Energy Applications

Teuvo Suntio, Tuomas Messo, Matias Berg, Henrik Alenius, Tommi Reinikka, Roni Luhtala and Kai Zenger
Additional contact information
Teuvo Suntio: Laboratory of Electrical Engineering, Tampere University, 33720 Tampere, Finland
Tuomas Messo: Laboratory of Electrical Engineering, Tampere University, 33720 Tampere, Finland
Matias Berg: Laboratory of Electrical Engineering, Tampere University, 33720 Tampere, Finland
Henrik Alenius: Laboratory of Electrical Engineering, Tampere University, 33720 Tampere, Finland
Tommi Reinikka: Laboratory of Electrical Engineering, Tampere University, 33720 Tampere, Finland
Roni Luhtala: Laboratory of Automation and Hydraulics, Tampere University, 33720 Tampere, Finland
Kai Zenger: Department of Electrical Engineering and Automation, Aalto University, 02150 Espoo, Finland

Energies, 2019, vol. 12, issue 3, 1-31

Abstract: Impedance-ratio-based interaction analyses in terms of stability and performance of DC-DC converters is well established. Similar methods are applied to grid-connected three-phase converters as well, but the multivariable nature of the converters and the grid makes these analyses very complex. This paper surveys the state of the interaction analyses in the grid-connected three-phase converters, which are used in renewable-energy applications. The surveys show clearly that the impedance-ratio-based stability assessment are usually performed neglecting the cross-couplings between the impedance elements for reducing the complexity of the analyses. In addition, the interactions, which affect the transient performance, are not treated usually at all due to the missing of the corresponding analytic formulations. This paper introduces the missing formulations as well as explicitly showing that the cross-couplings of the impedance elements have to be taken into account for the stability assessment to be valid. In addition, this paper shows that the most accurate stability information can be obtained by means of the determinant related to the associated multivariable impedance ratio. The theoretical findings are also validated by extensive experimental measurements.

Keywords: source and load impedance; transient dynamics; stability; grid synchronization; power electronics; power grid (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: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (9)

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