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基于分岔理论研究励磁饱和环节对系统电压稳定的影响(2015年第3期)
类别:联席会学术论文专栏 发布时间:[2015-06-08] 点击数:922

李国庆,张  浩,李  江,王义伟,张  鹏
(东北电力大学 电气工程学院,吉林 吉林 132012)

摘要: 以一个3 节点电力系统模型为基础,研究了励磁饱和环节及励磁电压顶值对系统电压稳定的影响。采用光滑函数可以对励磁限制器的限制作用进行模拟,但精度不高。采用降低方程组维数的方法进行模拟,即
当励磁饱和环节起作用时,设定Efd 为励磁电压顶值,并忽略励磁系统暂态方程。使用AUTO 07 软件进行算例分析,结果表明随着机械输入功率的增加,考虑励磁饱和环节后,负荷节点电压的运动轨迹将发生明显变化。当系统达到励磁极限并在极限上运行时,励磁顶值的降低将使负荷节点电压随机械输入功率的增加以更快的速度逼近鞍结和Hopf 分岔点,此时系统更容易失去稳定。
关键词: 电力系统; 稳定性; 鞍结分岔; Hopf 分岔; 电压稳定; 励磁; 饱和

Influence of excitation saturation element on power system voltage stability
based on bifurcation theory
LI Guoqing,ZHANG Hao,LI Jiang,WANG Yiwei,ZHANG Peng
(School of Electrical Engineering,Northeast Dianli University,Jilin 132012,China)

Abstract: With a three-bus power system model,the influences of excitation saturation element and top excitation voltage value on the system voltage stability are studied. Though a smooth function maybe applied to imprecisely simulate the performance of an excitation limiter,a method based on the dimensionality reduction of equation set is adopted,which sets Efd as the top excitation voltage and ignores the excitation transient equations when the excitation saturation element functions. Examples are analyzed by software AUTO 07 and results show that,when the excitation saturation element is considered,the motion trajectory of load bus voltage changes obviously along with the increase of the mechanical input power;when system reaches and runs on the excitation limit,the declining of top excitation voltage makes the load bus voltage more quickly approaching the saddle-node and Hopf bifurcation node along with the increase of mechanical input power,where system is more likely to lose its stability.
Key words: electric power systems; stability; saddle-node bifurcation; Hopf bifurcation; voltage stability;excitation; saturation

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