A General Design Procedure for Multi-Parallel Modular Grid-Tied Inverters System to Prevent Common and Interactive Instability

Based on the equivalent circuit model, the interactions of multi-parallel modular grid-tied inverters and their coupling effect with grid impedance are analyzed in this letter. The analysis shows that interactive instability could happen in the inverter system even when identical inverters have been...

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Veröffentlicht in:IEEE transactions on power electronics 2019-07, Vol.34 (7), p.6025-6030
Hauptverfasser: Chen, Tong, Lee, Chi-Kwan, Hui, S.Y. Ron
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Lee, Chi-Kwan
Hui, S.Y. Ron
description Based on the equivalent circuit model, the interactions of multi-parallel modular grid-tied inverters and their coupling effect with grid impedance are analyzed in this letter. The analysis shows that interactive instability could happen in the inverter system even when identical inverters have been used. However, if the control and circuit parameters are designed systematically, the system can be exempted from both common and interactive instability. The outcome of this research provides a practical general design paradigm for modular grid-tied inverters with inductor-capacitor-inductor ( LCL ) filters which can be used in the parallel operation with unknown number of modules. Experimental results are provided for verification.
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source IEEE/IET Electronic Library
subjects Circuit design
Circuits
Damping
Equivalent circuits
Grid-tied inverter
Impedance
inherent damping
Interactive systems
Inverters
LCL filter
Modular design
Modular systems
multi-parallel operation
Parallel operation
Power system stability
Resonant frequency
Stability
Stability analysis
Stability criteria
title A General Design Procedure for Multi-Parallel Modular Grid-Tied Inverters System to Prevent Common and Interactive Instability
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