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定子绕组暂态过程对电力系统大扰动特性的影响

, PP. 161-167

Keywords: 发电机,定子绕组暂态,转速变化,实用模型,大扰动特性,暂态稳定极限

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Abstract:

为了研究发电机3种机电暂态模型定子电压方程中定子绕组暂态(pφ)和转速变化(ω)对大扰动特性的影响,通过单机变压器双回线无穷大系统对3种模型在定子绕组暂态和转速单独作用以及共同作用等情况下的大扰动特性进行计算,得出定子绕组暂态对发电机大扰动的影响较大;在此基础上,将上述条件下3种模型的大扰动特性和暂态稳定极限与经过试验验证的时步有限元模型进行了对比。结果表明,计及定子绕组暂态和转速变化的3种机电暂态模型的大扰动特性和暂态稳定极限均与时步有限元结果更接近,并且在一定程度上提高了电网的最大传输功率计算值,为电力系统仿真中发电机的建模提供了重要的理论基础。

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