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Article

Sub-/Super-SCI Influencing Factors Analysis of VSC-HVDC and PMSG-Wind Farm System by Impedance Bode Criterion

School of Mechanical Electronic & Information Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China
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Academic Editor: Hani Vahedi
Electronics 2021, 10(15), 1865; https://doi.org/10.3390/electronics10151865
Received: 5 July 2021 / Revised: 23 July 2021 / Accepted: 29 July 2021 / Published: 3 August 2021
(This article belongs to the Section Power Electronics)
A sub-/super-synchronous interaction (sub-/super-SCI) can occur between a voltage source converter-based high-voltage direct current (VSC-HVDC) and the permanent magnet synchronous generator (PMSG)-based wind farms with long AC transmission lines. However, the influencing factors have not been properly analyzed. In this paper, these are deconstructed and mathematically analyzed from detailed small-signal impedance equations in the dq-frame and the corresponding Bode stability criterion. Distinguishing conclusions from existing papers are obtained by studying the controllers’ bandwidths instead of their coefficients. The impacts of AC line impedance on system stability are also investigated. From the analysis of their compositions in impedance structure, the VSC-HVDC bandwidths and the wind farm phase-locked loop (PLL) bandwidth and power ratio, and the AC line impedance have various influences on the system stability. Meanwhile, the wind farm outer DC voltage and inner current control bandwidths have little impact on system stability. The results of these studies show that the magnitude in the axes q-axes impedance interaction is the essential factor for system instability. Our studies also show system stability is more sensitive to the HVDC bandwidths than the wind converter PLL bandwidth. The simulation results verify our theory conclusions. View Full-Text
Keywords: impedance; VSC-HVDC; PMSG-wind farm; sup/sub-SCI; stability; bandwidth; line impedance impedance; VSC-HVDC; PMSG-wind farm; sup/sub-SCI; stability; bandwidth; line impedance
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MDPI and ACS Style

Zhang, Y.; Tian, X.; Wang, C.; Cheng, H. Sub-/Super-SCI Influencing Factors Analysis of VSC-HVDC and PMSG-Wind Farm System by Impedance Bode Criterion. Electronics 2021, 10, 1865. https://doi.org/10.3390/electronics10151865

AMA Style

Zhang Y, Tian X, Wang C, Cheng H. Sub-/Super-SCI Influencing Factors Analysis of VSC-HVDC and PMSG-Wind Farm System by Impedance Bode Criterion. Electronics. 2021; 10(15):1865. https://doi.org/10.3390/electronics10151865

Chicago/Turabian Style

Zhang, Yibo, Xu Tian, Cong Wang, and Hong Cheng. 2021. "Sub-/Super-SCI Influencing Factors Analysis of VSC-HVDC and PMSG-Wind Farm System by Impedance Bode Criterion" Electronics 10, no. 15: 1865. https://doi.org/10.3390/electronics10151865

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