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同步发电机不同实用模型的大扰动特性对比研究

, PP. 67-73

Keywords: 同步发电机,实用模型,时步有限元,大扰动,暂态稳定极限

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Abstract:

为了研究同步发电机3种实用模型对电力系统大扰动特性和暂态稳定极限的影响,采用dq0坐标系下的实用模型与abc坐标系下的电网模型联立求解的方法,推导了发电机与电网接口关系的方程,建立了以实用模型为基础的单机双回线无穷大系统,并以经过试验验证的场-路-网耦合时步有限元模型作为标准响应,对各实用模型进行校验。采用上述模型对300MW同步发电机进行仿真计算表明:3种实用模型的大扰动特性存在明显差异,且暂态稳定极限都较为保守;额定励磁下,实用模型与时步有限元的暂态稳定极限最大相差8.8%。研究结果为电力系统仿真中合理选择发电机模型提供了重要参考。

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