Influence of Active Power Output and Control Parameters of Full-Converter Wind Farms on Sub-Synchronous Oscillation Characteristics in Weak Grids

Yafeng Hao, Jun Liang, Kewen Wang, Guanglu Wu, Tibin Joseph and Ruijuan Sun
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Yafeng Hao: School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China
Jun Liang: School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China
Kewen Wang: School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China
Guanglu Wu: State Key Laboratory of Power Grid Safety and Energy Conservation (China Electric Power Research Institute), Beijing 100192, China
Tibin Joseph: School of Engineering, Cardiff University, Cardiff CF24 3AA, UK
Ruijuan Sun: School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China

Energies, 2020, vol. 13, issue 19, 1-17

Abstract: Active power outputs of a wind farm connected to a weak power grid greatly affect the stability of grid-connected voltage source converter (VSC) systems. This paper studies the impact of active power outputs and control parameters on the subsynchronous oscillation characteristics of full-converter wind farms connected weak power grids. Eigenvalue and participation factor analysis was performed to identify the dominant oscillation modes of the system under consideration. The impact of active power output and control parameters on the damping characteristics of subsynchronous oscillation is analysed with the eigenvalue method. The analysis shows that when the phase-locked loop (PLL) proportional gain is high, the subsynchronous oscillation damping characteristics are worsened as the active power output increases. On the contrary, when the PLL proportional gain is small, the subsynchronous oscillation damping characteristics are improved as the active power output increases. By adjusting the control parameters in the PLL and DC link voltage controllers, system stability can be improved. Time-domain results verify the analysis and the findings.

Keywords: weak grids; full-converter wind; active power output; control parameters; subsynchronous oscillation; eigenvalue analysis (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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