PSS2A模型的负阻尼案例分析及检测方法  

Negative Damping Case Analysis and Detection Method of PSS2A Model

作　　者：张俊峰[1] 李鹏[2] 郭琦 

机构地区：[1]广东电网公司电力科学研究院,广东省广州市510080 [2]中国南方电网电力调度控制中心,广东省广州市510623 [3]南方电网科学研究院,广东省广州市510080

出　　处：《电力系统自动化》2014年第2期127-130,共4页Automation of Electric Power Systems

摘　　要：2010年12月2日平班电厂发生低频振荡事件,振荡前广西百色地区220 kV平百线曾发生A相故障,线路重合不成功后三跳,现场调查及分析结果为PSS2A模型的角速度信号被误屏蔽,导致了电力系统稳定器(PSS)在投入状态下提供负阻尼。对此次振荡事件分别在电力系统分析软件BPA和RTDS上进行了仿真重现。通过将平班电厂的实际自动电压调节器装置与RTDS仿真模型互连进行闭环仿真试验,不但重现了此次低频振荡事件,而且暴露出PSS2A模型由于计算不准确而产生在高频段(1 Hz以上)提供正阻尼、低频段(1 Hz以下)提供负阻尼的现象。从PSS2A模型的机理上分析了此负阻尼现象产生的原因,探讨了现场试验检测方法在检测PSS2A模型在低频段阻尼效果的局限性,阐述了进行PSS2A模型RTDS入网检测的必要性。The low frequency oscillation incident occurred between Pingban power plant and Guangxi power grid on December 2,2010. Prior to the oscillation,Guangxi Baise area 220 kV Pingbai line experienced a phase A fault of three jumps following unsuccessful reclosing. Scene investigation and analysis results show that the angular rate signal in the PSS2A model was mistakenly shielded,leading to the power system stabilizer（ PSS） providing negative damping in active state. China Southern Power Grid Corporation attached great importance to this oscillation incident,which was reproduced by simulation on power system analysis software BPA and real-time digital simulation（ RTDS）. By interconnecting the actual excitation regulator device and RTDS for closed-loop simulation test,not only the low frequency oscillation incident is reproduced,but also the phenomenon of the PSS2A model providing positive damping in the high frequency band（ above 1 Hz） and negative damping in the low frequency band（ below 1 Hz） due to inaccurate calculation is exposed. This paper analyzes the causes of the negative damping phenomenon from the point of view of the mechanism of the PSS2A model,and studies the limitations of the field test method in testing the PSS2A model s effect of damping in the low- frequency band,and expounds the necessity of the PSS2A model for RTDS power grid access.

关 键 词：负阻尼 补偿特性 强迫振荡 低频振荡 实时数字仿真 

分 类 号：TM621[电气工程—电力系统及自动化]