Modeling and Stability Analysis of Weak-Grid Tied Multi-DFIGs in DC-Link Voltage Control Timescale

Dong Wang, Houquan Chen, Yunhui Huang, Xiangtian Deng and Guorong Zhu
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Dong Wang: Department of Electrical Engineering, School of Automation, Wuhan University of Technology, Wuhan 430070, China
Houquan Chen: Department of Electrical Engineering, School of Automation, Wuhan University of Technology, Wuhan 430070, China
Yunhui Huang: Department of Electrical Engineering, School of Automation, Wuhan University of Technology, Wuhan 430070, China
Xiangtian Deng: Department of Electrical Engineering, School of Automation, Wuhan University of Technology, Wuhan 430070, China
Guorong Zhu: Department of Electrical Engineering, School of Automation, Wuhan University of Technology, Wuhan 430070, China

Energies, 2020, vol. 13, issue 14, 1-18

Abstract: The DC-link voltage control (DVC) timescale (i.e., the frequency dynamics covering converter outer controls) instabilities in wind generation have gained increased attention recently. This paper presents DVC timescale modeling and stability analysis for multi doubly-fed induction generators (DFIGs) connected to weak AC grids. A reduced-order, small-signal model of a grid-tied multi-DFIG system, designed for DVC dynamics analysis, is firstly proposed. The model allows for the dynamic interactions among the DC-link voltage control, active power control (APC), terminal voltage control (TVC) and phase-locked loop (PLL). Eigenvalue and participation factor analyses are conducted to explore the potential instabilities and correlated critical factors for such a multi-machine system. The sensitivity studies find that instability can occur at high levels of power generations or low short-circuit ratio (SCR) conditions. In addition, the dominant mode is identified to be highly related to the PLL, and its modal damping is decreased when the bandwidths of PLLs in different generators are close. Detailed model-based time domain simulations verified the analysis above.

Keywords: DFIG; weak grid; DC-link voltage control timescale; eigenvalue analysis; PLL (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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