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Title: | Bifurcation and large-signal stability analysis of three-phase voltage source converter under grid voltage dips | Authors: | Huang, M Peng, Y Tse, CK Liu, Y Sun, J Zha, X |
Issue Date: | Nov-2017 | Source: | IEEE transactions on power electronics, 2017, v. 32, no. 11, p. 8868-8879 | Abstract: | Three-phase voltage source converters (VSCs) are commonly used as power flow interface in ac/dc hybrid power systems. The ac power grid suffers from unpredictable short-circuit faults and power flow fluctuations, causing undesirable grid voltage dips. The voltage dips may last for a short time or a long duration, and vary the working conditions of VSCs. Due to their nonlinear characteristics, VSCs may enter abnormal operating mode in response to voltage dips. In this paper, the transient response of three-phase VSCs under practical grid voltage dips is studied and a catastrophic bifurcation phenomenon is identified in the system. The converter will exhibit an irreversible instability after the dips. The expanded magnitude of ac reactive current may cause catastrophic consequence for the system. A full-order eigenvalue analysis and a reduced-order mixed-potential-theory-based analysis are adopted to reveal the physical origin of the large-signal instability phenomenon. The key parameters of the system are identified and the boundaries of instability are located. The bifurcation phenomenon and a set of design-oriented stability boundaries in some chosen parameter space are verified by cycle-by-cycle simulations and experimental measurement on a practical grid-connected VSC prototype. | Keywords: | Catastrophic bifurcation Grid voltage dips Large-signal stability Three-phase voltage source converter (VSC) Transient response |
Publisher: | Institute of Electrical and Electronics Engineers | Journal: | IEEE transactions on power electronics | ISSN: | 0885-8993 | EISSN: | 1941-0107 | DOI: | 10.1109/TPEL.2017.2648119 | Rights: | © 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The following publication M. Huang, Y. Peng, C. K. Tse, Y. Liu, J. Sun and X. Zha, "Bifurcation and Large-Signal Stability Analysis of Three-Phase Voltage Source Converter Under Grid Voltage Dips," in IEEE Transactions on Power Electronics, vol. 32, no. 11, pp. 8868-8879, Nov. 2017 is available at https://doi.org/10.1109/TPEL.2017.2648119. |
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BifurcatiLarge-Signal_Stability_Analysis.pdf | Pre-Published version | 6.85 MB | Adobe PDF | View/Open |
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