Sequences Domain Impedance Modeling of Three-Phase Grid-Connected Converter Using Harmonic Transfer Matrices

The sequence-domain impedance using harmonic linearization technique can well describe the harmonic behavior of the interconnected system consisting of the grid and converter. However, fast phase-locked loop (PLL) design, unbalanced current controller structure will cause the unneglectable off-diago...

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Bibliographic Details
Published in:IEEE transactions on energy conversion 2018-06, Vol.33 (2), p.627-638
Main Authors: Nian, Heng, Chen, Liang, Xu, Yunyang, Huang, Hongyang, Ma, Junchao
Format: Article
Language:English
Subjects:
Couplings
Harmonic analysis
harmonic transfer matrix
Impedance
linear time invariant
linear time periodic
Phase locked loops
Power system harmonics
Power system stability
Sequence domain impedance
Stability analysis
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Summary:The sequence-domain impedance using harmonic linearization technique can well describe the harmonic behavior of the interconnected system consisting of the grid and converter. However, fast phase-locked loop (PLL) design, unbalanced current controller structure will cause the unneglectable off-diagonal components in impedance matrix of converter. Due to the frequency coupling and sequence coupling effect in the sequence domain, the traditional single input single output transfer function lacks the capability to accurately express this frequency shift relationship. Therefore, in this paper, the harmonic transfer matrix (HTM) is used to model the frequency shift existing in the sequence-domain impedance model. By unifying positive sequence and negative sequence components, the complexity of impedance model derivation can be reduced. The linear time-periodic system is transformed to a linear time-invariant system in harmonic domain. And then, Nyquist criteria is applied to analyze the stability of the interconnected system. Finally, simulation results verify the proposed HTM-based sequence-domain impedance modeling method.
ISSN:0885-8969
1558-0059
DOI:10.1109/TEC.2017.2761791