摘要
过电压的在线监测和实时分析对过电压的防护、治理及数值仿真研究具有重要意义。提出一种基于电磁式电压互感器(voltage transformer,VT)宽频线性黑盒模型的过电压在线监测新方法。该方法利用电站现有的VT和二次电缆获取和传输过电压信号。基于黑盒原理建立了监测系统整体二端口传输参数模型,推导了矢量匹配法结合时域递归卷积的数值反演计算公式。根据测量得到的二次侧过电压信号,仿真计算获得了VT高压侧的过电压波形。应用该方法,在实验室搭建了过电压在线监测系统,计算结果与测量数据的比较验证了该监测方法的可行性和计算方法的有效性。
The online monitoring and analysis of the over-voltage is of great significance for the protection, control and numerical simulation research of the over-voltage in power system. A new method for over-voltage on-line monitoring based on the wideband transmission characteristic of potential transformer was proposed. This method applied the voltage transformers （VT）, secondary cables of the substation to obtain and transfer the over-voltage signals. The two ports network transmission parameter model of the whole system was build based on the black-box technique, and the numerical inverse calculation formula was deduced by means of vector fitting combining recursive convolution. AdoVTion of this model could derive the over-voltage waveform of the high-voltage port of the VT from the voltage signal of the secondary device by means of numerical simulation. The online monitoring system was put up in the laboratory. The comparison between the calculated results and measured data verified the feasibility of this monitoring method and the validity of the numerical inverse calculation method.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2011年第22期142-148,共7页
Proceedings of the CSEE
基金
国家自然科学基金项目(50977031)
河北省自然科学基金项目(E2008001243)
中央高校基本科研业务费专项资金资助项目~~
关键词
电压互感器
过电压在线监测
矢量匹配法
递归卷积
传输参数
黑盒模型
voltage transformer （VT）
over-voltage on-line monitoring
vector fitting
recursive convolution
transmission parameters
black-box model
