双馈风电机组轴系扭振的稳定与控制

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摘要在侧重研究双馈风电机组与电网的动态作用时,双馈风电机组轴系可用等效两质量块模型表示。在外界扰动下,轴系动态以振荡方式呈现,并反映在输出功率上,由于这一振荡频率接近电力系统低频振荡,因此会对同步机组的功角稳定产生影响;不仅如此,轴系振荡还会影响双馈风电机组自身的稳定性以及使用寿命。本文首先采用小信号分析方法,对有功控制回路进行电气阻尼特性分析,得出双馈风电机组在最大功率跟踪控制下的负电气阻尼特性,不利于轴系稳定;随后,提出一种轴系镇定器,包含电气阻尼和电气刚度两个回路,增加电气阻尼可以使轴系振荡得到有效抑制,对双馈风电机组和电力系统的稳定有利;增加电气刚度,等效加强了轴系的耦合强度,可有效抑制转速振荡的幅值,有益于延长机组寿命。

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	张琛
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	汪宁勃

关键词 ：双馈风电机组, 轴系振荡, 轴系镇定器, 功角稳定, 电气阻尼, 电气刚度, 电气阻尼特性

Abstract：When focused on learning dynamic interaction between doubly-fed wind turbine and the grid, the equivalent two-mass shaft model of doubly-fed wind turbine was sufficient. Under external disturbance, shaft dynamic is characterized as torsional oscillation and reflected in the output power, the oscillation frequency is close to the power system oscillation, and might have an impact on power angle stability; Moreover, shaft oscillation will also affect the stability and lifespan of the doubly-fed wind turbine itself. Using small signal analysis methods, electrical damping characteristics of the active control loop is firstly analyzed, negative electrical damping characteristics of the doubly-fed wind turbine under the maximum power point tracking control is provided, and it’s not conducive to shaft stability. Subsequently a shaft stabilizer is proposed, contains electrical damping and electrical stiffness two control loops, increasing electrical damping can effectively suppress the shaft torsional oscillation, which is beneficial to the stability of the doubly-fed wind turbine and power system; increasing electrical stiffness is equivalent to strengthen shaft coupling, to inhibit speed oscillation amplitude, which is favorable to the lifespan of doubly-fed wind turbine.

Key words： Doubly-fed wind turbine torsional oscillation shaft stabilizer power angle stability electrical damping electrical stiffness electrical damping characteristic

收稿日期: 2013-05-24 出版日期: 2015-06-29

PACS:

TM614

基金资助:国家863计划（003 2011AA05A104）和国家电网科技资助项目

作者简介: 张琛 ,男，1989年生，博士研究生，研究方向为风电接入装备及并网控制技术。李征女，1961年生，教授，研究方向为分布式电能系统控制及储能系统。

引用本文:

张琛, 李征, 蔡旭, 高强, 汪宁勃. 双馈风电机组轴系扭振的稳定与控制[J]. 电工技术学报, 2015, 30(10): 301-310. Zhang Chen, Li Zheng, Cai Xu, Gao Qiang, Wang Ningbo. Stability and Control of Shaft Torsional Oscillation for Doubly-Fed Wind Power Generator. Transactions of China Electrotechnical Society, 2015, 30(10): 301-310.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2015/V30/I10/301

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