电力系统强迫功率振荡实例及机理分析  

Instances and Mechanism Analysis of Forced Power Oscillation in Power Systems

作　　者：刘辉[1] 杨寅平[2] 田云峰[1] 刘平[1] 李庚银[2] 

机构地区：[1]华北电力科学研究院有限责任公司,北京市100045 [2]华北电力大学电气与电子工程学院,北京市102206

出　　处：《电力系统自动化》2012年第10期113-117,共5页Automation of Electric Power Systems

摘　　要：介绍了某地区电网发生的2次功率低频振荡事件,阐述了振荡机理,提出了解决方案。通过相量测量单元波形分析总结了其基本特征,用单机无穷大系统进行了理论计算,同时根据故障场景开展了PSD-BPA时域仿真,证明了2次事件均属于强迫低频振荡。根据2次振荡事件中汽轮机调门流量特性等特点,结合现场试验,证实油动机的抖动是造成功率振荡的扰动源。对调门流量特性的相关参数进行了优化,修正了拐点处的流量特性,避免了类似强迫低频振荡事件的再次发生。Based on the two low-frequency power oscillation events in a regional grid, the mechanism of power oscillations are described in detail. Corresponding solution methodologies are proposed accordingly. The characteristics of the oscillations are obtained and analysed through phasor measurement unit （PMU） measurements. Theoretical calculation is conducted using single machine infinite bus system model. Time domain simulations using BPA software is also performed following the scenarios of the two events. Consequently, the two events have been proven to be forced low frequency oscillations. Furthermore, based on discharge characteristics of the two events together with field test, it has been identified that the source of disturbance is wobbling of the controlvalve. Finally, discharge characteristic at the inflection point is meliorated through optimizing discharge characteristics of the governing valve, as such further forced low-frequency oscillation events can be avoided.

关 键 词：强迫功率振荡 相量测量单元 汽轮机调速器 时域仿真 电力系统 低频振荡 

分 类 号：TM712[电气工程—电力系统及自动化]