摘要
为了实现电网与并网逆变器的稳定运行,提出一种基于PRBS信号注入的电网阻抗在线检测方法。该方法通过并网逆变器向电网注入PRBS扰动信号来获得特定频率的响应电压和扰动电流,然后进行DFT变换,最后得到电网阻抗。仿真结果表明:PRBS注入法对电网的扰动较小,能够更好地测量电网阻抗,检测精度高。
In order improve the reliability of voltage switching circuit,and according to anti-accident measures of China Southern Power Grid and the requirement of dual measurement and control configuration in convert station,design defects of PRS-789 type voltage switching device in a convert station are analyzed based on working principle of voltage switching circuit.Effective improvement measures have been adopted in the device according to field actual situation.It is testified by field test that the improved voltage switching circuit can satisfy both the requirement of anti-accident measures and the monitoring of overall switching relay circuit status.Finally,Attentions in the operation and maintenance of voltage switching circuit are proposed according to field operation and maintenance experiences.
作者
胡付有
张武其
尹忠葵
荣军
卢雯兴
HU Fuyou;ZHANG Wuqi;YIN Zhongkui;RONG Jun;LU Wenxing(Liuzhou Power Supply Bureau,Guangxi Power Grid Co.,Ltd.,Guangxi Liuzhou 545006,China)
出处
《广西电力》
2018年第2期21-24,共4页
Guangxi Electric Power
关键词
并网逆变器
电网阻抗
PRBS
在线检测
voltage switching
secondary circuit
TV juxtaposition
convert station
