Small Disturbance Stability Analysis of Onshore Wind Power All-DC Power Generation System Based on Impedance Method

Tao Wang, Fengting Li (), Chunya Yin and Guixin Jin
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Tao Wang: College of Electrical Engineering, Xinjiang University, Urumqi 830017, China
Fengting Li: College of Electrical Engineering, Xinjiang University, Urumqi 830017, China
Chunya Yin: College of Electrical Engineering, Xinjiang University, Urumqi 830017, China
Guixin Jin: College of Electrical Engineering, Xinjiang University, Urumqi 830017, China

Energies, 2024, vol. 17, issue 6, 1-18

Abstract: The Onshore Wind Power All-DC Generation System (OWDCG) is designed to integrate with renewable energy sources by modifying the grid structure. This adaptation supports the grid infrastructure and addresses the challenges of large-scale wind power AC collection and harmonic resonance during transmission. Crucially, small disturbance stability parameters are essential for ensuring the system’s stable operation. Unlike conventional power systems, the OWDCG exhibits strong coupling between subsystems, accentuating the small disturbance stability issue due to the dynamic nature of its converter control system. The impedance method facilitates the decomposition of such systems into subsystems, offering insights into the destabilization mechanism through the lens of negative impedance contribution. This approach is conducive to conducting small disturbance stabilization analyses. To tackle this issue, the initial step involves deriving the input and output equivalent impedance models of the subsystem, considering the topological structure, control features, and operational dynamics of the OWDCG. Subsequently, the impact of circuit and control parameters on the system’s impedance characteristics and small-disturbance stability is examined through Bode diagrams and Nyquist curves. This analysis identifies critical parameters for small-disturbance stability, guiding the stable operation and parameter optimization of the OWDCG. The analysis highlights that the main control strategies for stability are the Modular Multilevel Converter (MMC) DC voltage control and the inner-loop current control gain. Validation of the theoretical findings is achieved through simulation results using PSCAD/EMTDC.

Keywords: OWDCG; small disturbance stability; impedance modeling; Nyquist criterion (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: 2024
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