摘要
功角振荡会破坏电力系统稳定性,影响系统可靠运行,针对功率扰动引起功角振荡问题,建立单机无穷大系统的数学模型,并利用求解弱非线性方程的平均法,研究该系统随着机电扰动的功角响应特征,导出机电功率扰动下幅值平方变化规律在受到机械功率的周期性扰动的作用下,系统会出现一个极限环,在受到电磁功率扰动时,系统会出现3种不同的最终状态,最终稳定于哪个状态,取决于系统的初始状态和扰动的幅值和频率,相图研究结果证明该理论的正确性。
Power angle oscillation will destroy the stability of power system and affect the reliable operation of the system.Aiming at the problem of power angle oscillation caused by power disturbance,this paper establishes a mathematical model of single machine infinite bus system,and studies the power angle response characteristics of the system with electromechanical disturbance by means of the average method of solving weak non-linear equation.The square variation law of amplitude under electromechanical power disturbance is derived.Under the action of periodic disturbance,the system may have a limit cycle.When disturbed by electromagnetic power,the system may have three different final states.Which state will be stabilized ultimately depends on the initial state of the system and the amplitude and frequency of the disturbance,which provides a theoretical basis for further control of power angle oscillation.The result of phase diagram study proves the correctness of the theory.
作者
杨春玲
郑安豫
朱建华
YANG Chunling;ZHENG Anyu;ZHU Jianhua(Anhui Vocational Electrical Engineering Professional Technique College,Hefei 230051,China;Xinjiang Electric Power Research Institute,Urumqi 830011,China)
出处
《黑龙江工程学院学报》
CAS
2019年第5期7-10,共4页
Journal of Heilongjiang Institute of Technology
关键词
弱非线性
功角极限环
幅值平方
平均法
相图
weak nonlinear
power angle limit cycle
square of amplitude
averaging method
phase diagram
