汽轮发电机不同模型小扰动特性

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摘要电力系统仿真分析常用的几种同步发电机实用模型是在Park方程基础上引入不同假设条件得到的。不少文献假设参数满足x_afx_D=x_aDx_fD(q轴同理)而得到所谓的假设A模型, 而将满足x_ad=x_af=x_aD=x_fD关系的实用模型称为假设B模型, 对假设B模型进一步简化得到假设B-1模型。为了分析不同实用模型小扰动仿真结果的准确性, 本文将其与时步有限元仿真结果进行对比:首先研究了各模型假设条件的物理意义, 揭示出不同假设条件的根本区别在于是否计及励磁绕组和阻尼绕组之间的互漏磁链;然后以300MW汽轮发电机单机无穷大系统为例, 对比了三种实用模型和时步有限元的小扰动仿真结果, 重点分析了由大齿导条、转子导电槽楔构成的阻尼绕组和导磁导电的转子实心体分别作用和共同作用下的小扰动仿真结果;最后通过对小扰动特性指标进行对比分析得出假设A模型的仿真结果与时步有限元最接近。研究结果为电力系统仿真中合理选择汽轮发电机模型提供了重要参考。

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	康锦萍
	罗应立

关键词 ：汽轮发电机, 实用模型, 时步有限元, 小扰动

Abstract：The practical models of turbine generator used in power system simulation are derived from Park equations by introducing different assumed conditions. The so-called assumed A practical model is obtained by postulating x_afx_D=x_aDx_fD in several literatures, while assumed B practical model is obtained by postulating x_ad=x_af=x_aD=x_fD. The B-1 practical model is obtained based on assumed B by further hypothesis. In order to analyse the accuracy of simulation results, the small-disturbance characteristics calculated by practical models are compared with time step finite element method(TSFEM). Firstly, the physical significance of different assumed condition is studied. The essential distinction of different assumed conditions is considering the mutual leakage flux linkage between exciting winding and damping winding or not; Then, take single machine infinite system for example, the small-disturbance characteristic calculated by different models are compared under the different damping structures. Finally, the small-disturbance characteristic calculated by assumed A is closed to T-S FEM through comparing small-disturbance characteristics index. The result provides reasonable reference to select practical model in power system simulation.

Key words： Turbine generator practical models time step finite element method small disturbance

收稿日期: 2012-04-13 出版日期: 2014-03-25

PACS:

TM341

基金资助:“十一五”国家科技支撑资助项目(2008BAA13B02)

作者简介: 许国瑞男, 1986年生, 博士研究生, 主要研究方向为大型同步发电机模型及参数。汤涌男, 1959年生, 博士, 教授级高级工程师, 主要从事电力系统分析软件开发和电力系统分析工程研究。

引用本文:

许国瑞, 汤涌, 刘晓芳, 王红宇, 康锦萍, 罗应立. 汽轮发电机不同模型小扰动特性[J]. 电工技术学报, 2013, 28(9): 302-309. Xu Guorui, Tang Yong, Liu Xiaofang, Wang Hongyu, Kang Jinping, Luo Yingli. Small Disturbance Characteristics of the Different Turbine Generator Models. Transactions of China Electrotechnical Society, 2013, 28(9): 302-309.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2013/V28/I9/302

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