Modeling and Analysis of Sub-Synchronous Oscillation in Wind Power Grid Connection System

Jun TIAN; Wenyi ZHANG; Yupeng WANG; Zhongmao LIN; Pingjian YANG; Yingwei QIN; Caibo ZHAO; Shi ZHANG

doi:10.16513/j.cnki.10-1427/tk.2018.05.004

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Distributed Energy ›› 2018, Vol. 3 ›› Issue (5) : 22-27. DOI: 10.16513/j.cnki.10-1427/tk.2018.05.004

Basic Research

Modeling and Analysis of Sub-Synchronous Oscillation in Wind Power Grid Connection System

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Abstract

With the extensive application of wind power series compensation technology in China, it also exposes the existing safety problems. There are many sub-synchronous oscillation (SSO) events in places such as Guyuan in Hebei and Hami in Xinjiang, which lead to the system can not operating safely and stably. In this paper, a mathematical model is established to solve the SSO problem caused by the outputting power of double fed induction generator (DFIG) through a series compensation line, and the simulation model based on PSCAD is built to analyze the influencing factors of SSO in wind power grid connection system. The analysis shows that, the smaller the wind speed is, the higher the degree of series compensation is, the easier the sub-synchronous oscillation is; when the degree of series compensation is high, the higher the frequency of sub-synchronous oscillation is, the lower the electrical damping coefficient is. The larger the ratio coefficient and integral coefficient of the current inner loop of the rotor-side converter is, the more intense the sub-synchronous control interaction (SSCI) will be and the greater the influence on the SSO will be.

Key words

wind turbine / sub-synchronous oscillation / series compensation / damping coefficient

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Jun TIAN , Wenyi ZHANG , Yupeng WANG , et al . Modeling and Analysis of Sub-Synchronous Oscillation in Wind Power Grid Connection System[J]. Distributed Energy Resources. 2018, 3(5): 22-27 https://doi.org/10.16513/j.cnki.10-1427/tk.2018.05.004

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