摘要发电机兼有机械运动和电磁变化。因其复杂的特性,描述它的方程同样是非常复杂的、难以计算的。然而在系统分析和计算中,它又是一个非常重要的元件,所以在稳定分析中常用实用模型代替。实用模型是对原模型的简化,需要具体分析它与原模型的差异。86034
本文以一个单机无穷大系统为研究对象,分别采用发电机5阶模型和7阶详细模型,计算系统的暂态响应,并作比较分析。结果表明,5阶模型与7阶模型的差异是由于定子暂态而产生的直流偏置量造成的,而这种影响很小时可以忽略,这时可以用5阶代替7阶模型进行计算分析。
毕业论文关键词 发电机 详细模型 降阶模型 暂态分析
毕业设计说明书外文摘要
Title A Comparative Study on the Practical Reduced-order Synchronous Generator Model
Abstract The dynamics of a generator is the combination of both mechanical motions and electromagnetic variations。 Because of its complicated characteristcs, the equations that are also complicated and hard to calculate。 However, generator is a very important component in stability analysis, therefore the practicable model is employed to replace it。 The practicable model is a simplification of the original model, we need to specifically analyze the differences between them。
In this paper, a single-machine-infinite-bus system is investigated, the transient responses, when 5th-order generator model and 7th-order detailed model is used respectively, are calculated and compared。 The result shows that the differences between the 5th- and 7th-order model are mainly due to the DC current offset in the transients。 When the influence is minor, as are shown in many cases, it is appropriate to replace the 7th-order model with the 5th-order one。
Keywords generator original model reduced-order model transient analysis
目 次
1 绪论 1
1。1 研究背景及意义 1
1。2 研究现状 1
1。3 本文的工作 2
2 电力系统元件模型 4
2。1 同步发电机详细模型 4
2。1。1 坐标下详细模型导出 5
2。2。2 Park变换 8
2。2。3 坐标下电机方程的标幺值表示 10
2。2 同步发电机5阶模型 12
2。3 负荷模型 12
2。4 本章小结 13
3 稳态分析 14
3。1 潮流计算 14
3。1。1 导纳矩阵 14
3。1。2 潮流计算问题 14
3。1。3 Newton-Raphson法 15
3。2 稳态计算