Unified admittance modeling of grid-connected converter and stability analysis for converter-grid system

Chunpeng Wang; Guorong Zhang; Runsheng Xie; Guanqing Zhou

doi:10.1117/12.2611279

14 October 2021 Unified admittance modeling of grid-connected converter and stability analysis for converter-grid system

Chunpeng Wang, Guorong Zhang, Runsheng Xie, Guanqing Zhou

Author Affiliations +

Proceedings Volume 11930, International Conference on Mechanical Engineering, Measurement Control, and Instrumentation; 1193038 (2021) https://doi.org/10.1117/12.2611279
Event: International Conference on Mechanical Engineering, Measurement Control, and Instrumentation (MEMCI 2021), 2021, Guangzhou, China

Abstract

Considering the actual situation, the converter-grid systems, including three-phase grid-connected converter and ac grid, mostly operate in the case of unbalance. However, most of the literature models and analyzes the balance situation, that is, the symmetric grid impedance and balanced three-phase grid voltage. In this paper, based on the harmonic transfer matrix (HTM) theory, a unified analytical expression of output admittance matrix of grid-connected converter is derived in detail, which can be used in both balance and unbalance cases. According to the relationship of interconnected system, the additional frequency components in unbalance conditions are uniformly equivalent to the frequency components existing in balance. Then the reduced-order output admittance model of the grid-connected converter and grid impedance model are established. Meanwhile, the correctness of the model is verified respectively. Based on the reduced-order model, the influencing factors of converter-grid systems under balanced and unbalanced conditions are analyzed.

Citation Download Citation

Chunpeng Wang, Guorong Zhang, Runsheng Xie, and Guanqing Zhou "Unified admittance modeling of grid-connected converter and stability analysis for converter-grid system", Proc. SPIE 11930, International Conference on Mechanical Engineering, Measurement Control, and Instrumentation, 1193038 (14 October 2021); https://doi.org/10.1117/12.2611279

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