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大型风电场中不同位置的风机对次同步谐振特性影响程度的比较分析

DOI: 10.13334/j.0258-8013.pcsee.2015.20.007, PP. 5173-5180

Keywords: 多风电场,双馈风机,串补系统,次同步谐振,影响因素

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Abstract:

针对双馈风机串补系统的次同步谐振问题,现有文献大都将整个风电场等效为单台风机进行研究,而忽略不同位置风机的风速、输出功率及其间线电缆参数对系统次同步特性的影响。该文将整个风电场划分为两个子风电场,分别等效为一台风机,建立两机串补系统模型,然后分别改变每台风机的转速、输出功率和电缆参数,比较对整个系统次同步特性的影响程度。结果表明:在同样风速条件下,不同位置的风机,对系统的次同步特性影响程度不同,离汇流母线近端的风机对系统稳定性的影响大于远端的风机。当整个风电场的输出功率给定,两子风电场输出容量配置比例不同,系统表现出的次同步特性不同,远端风电场输出功率越高系统稳定性越好。风机与汇流变母线之间的输电线路阻抗越大,系统的稳定性越强。

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