匹配控制型直驱风机并网系统阻抗建模及次同步振荡影响因素分析

doi:10.19595/j.cnki.1000-6753.tces.241097

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Abstract When the new energy units, mainly wind power and photovoltaic, are connected to the AC grid on a large scale through power electronic converters, the power system is prone to form a weak AC grid environment, which brings severe challenges to the stable operation of traditional grid-following new energy units. In recent years, scholars at home and abroad have proposed various grid-forming control strategies based on virtual synchronous generator control, sagging control, and matching control, enabling inverters to have suitable voltage and frequency support capabilities. Matching control only measures the DC voltage to realize the autonomous synchronization function and has a fast response speed, receiving widespread attention. However, research on grid-forming new energy units based on matching control focuses on supporting capacity and inertia response characteristics of AC grid, and the impedance characteristics and related influencing factors still need to be studied.
This paper first establishes the positive and negative sequence impedance model of matching-control-type direct drive wind turbines (DDWT) using the harmonic linearization method. The impedance analytical model is verified by combining the impedance sweep method. The stability of the matching-control-type DDWT system when connected to AC grids of different intensities is analyzed based on the equivalent RLC stability criterion. Furthermore, the dominant parameters affecting the impedance characteristics of matching-control-type DDWT are analyzed using impedance sensitivity, and a parameter optimization scheme is determined to improve system stability. Finally, the theoretical analysis is verified through PSCAD/EMTDC electromagnetic transient simulation.
It can be concluded that the positive sequence impedance model of matching-control-type DDWT is inductive in the low-frequency range and has a negative damping range in the sub-synchronous frequency range, but the phase is within -90°. The negative sequence impedance model exhibits capacitive behavior in the low-frequency range, then becomes inductive, and the phase of the capacitive frequency range is within -90°. Therefore, matching-control-type DDWT makes it challenging to form negative damping oscillation circuits with inductive AC grids. The stability analysis results based on the RLC stability criterion indicate that matching-control-type DDWT has suitable stability in weak AC grids but has a risk of oscillation in strong AC grids. Furthermore, the impedance sensitivity of each control parameter is calculated, and the dominant parameter that affects the impedance characteristics is determined based on the magnitude of the impedance sensitivity amplitude. According to the impedance’s real-imaginary frequency characteristic curve, a parameter adjustment method is obtained to improve the grid stability of matching-control-type DDWT in strong power grids.
The proportional coefficient of the reactive outer loop, the proportional coefficient of the current inner loop, and the virtual impedance of the grid side converter mainly affect the impedance characteristics. Properly reducing the reactive outer loop’s proportional coefficient and increasing the current inner loop’s proportional coefficient or virtual impedance can improve the stability of the matching-control-type DDWT grid-connected system.

Key words： Matching control grid-forming direct-drive wind turbine sub-synchronous oscillation impedance analysis

Received: 25 June 2024

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	Gao Benfeng
	Wang Qiuwen
	Wang Yaohan
	Sun Dawei
	Wang Xiao
	Wu Linlin
	Liu Hui
	Ran Huijuan

Cite this article:

Gao Benfeng,Wang Qiuwen,Wang Yaohan等. Impedance Modeling and Analysis of Subsynchronous Oscillation Influencing Factors for Grid Connected System of Matching Control Direct-Drive Wind Turbine[J]. Transactions of China Electrotechnical Society, 2025, 40(14): 4614-4628.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.241097 OR https://dgjsxb.ces-transaction.com/EN/Y2025/V40/I14/4614

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