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相近扭振频率并联发电机组次同步振荡研究

DOI: 10.13334/j.0258-8013.pcsee.2015.20.008, PP. 5181-5187

Keywords: 次同步振荡,相近扭振频率,并联发电机组,机网振荡模式,机组间振荡模式

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Abstract:

大型火力发电厂通常采用分期建设的方式,使得同一电厂中可能存在轴系扭振频率接近的并联发电机组。该文针对相近扭振频率并联发电机组次同步振荡的机理、特性和风险开展研究。首先采用特征值方法分析了相近扭振频率并联机组次同步振荡的机网振荡模式和机组间振荡模式的形成机理和特点,并对发生于实际系统中的次同步振荡现象给出了清晰、合理的解释。在此基础上,分析了串补度和开机组合方式对两种振荡模式的影响,从而揭示了相近扭振频率并联机组次同步振荡的风险规律。最后,采用数字仿真方法对分析结论进行了验证。

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