关于振荡角的振荡中心电压和ucosφ的变化特征  

Oscillation Center Voltage of Oscillation-angle and the Characteristics of ucosφ

作　　者：邓华[1] 高鹏[1] 王建全[1] 

机构地区：[1]浙江大学电气学院,杭州310027

出　　处：《电力系统及其自动化学报》2007年第1期68-73,共6页Proceedings of the CSU-EPSA

摘　　要：基于等值电势幅值不等的双机系统在失步过程中振荡角的振荡中心位置公式,研究了振荡角的振荡中心电压公式及其变化特征。研究发现,在一个失步周期中,当δ在0°和360°附近时,ucosφ可能并不能代表系统中任一点的电压,没有具体的物理意义。但在其它情况下,ucosφ基本能够反应失步断面联络线上最低电压点的变化特征。故提出了基于ucosφ轨迹特征的失步解列装置启动判据,该判据能够在系统失步前准确启动装置,并对利用ucosφ轨迹实现振荡闭锁功能进行了探讨。最后,通过仿真进行了必要的说明。In the paper, the location of oscillation-angle oscillation center and its voltage characteristics in the course of asynchronization of equivalent two-machine power system with unidentical internal voltages are studied. In one period of out-of-step, when δ is close to 0° and 360°,ucosφ is likely to be no physical meaning for the system. But in other conditions, ucosφ can reflect the lowest voltage magnitude at the interface tie lines of out-of-step power system. The authors have proposed a system separation activation criterion based on the characteristics of the curve ucosφ, which can activate the separation devices effectively before system loses its synchronism, and the paper dissusses the method of distinguishing the fault from the power swings based on ucosφ. In the end,case study by simulation is given for explanation.

关 键 词：失步 失步中心 振荡角的振荡中心 ucosφ 

分 类 号：TM712[电气工程—电力系统及自动化]