摘要
电网阻抗检测是研究弱电网和逆变器之间动态交互作用的关键技术。为快速获取准确的电网阻抗信息,提出一种基于高频非特征次谐波注入和采用复数滤波器(CCF)进行谐波提取的电网阻抗检测方法。分析了基于CCF进行谐波提取的电网阻抗检测方法基本原理,并结合CCF传递函数的幅频特性曲线和根轨迹对其截止频率进行了优化设计。仿真和实验验证了所提电网阻抗检测方法以及所选取截止频率的有效性。
The estimation of grid impedance is the key issue of studying the dynamic interactions between grid-conne- cted inverters and the weak grid.For the purpose of acquiring the accurate value of grid impedance rapidly, a method of grid impedance estimation is proposed based on injecting high frequency uncharacteristic harmonics and using complex coefficient filter（CCF） to extract uncharacteristic harmonics in voltage and current response signals.The wor- king principle of the proposed grid impedance estimation method is analyzed.The optimal parameter of CCF cut-off frequency is designed by the magnitude-frequency curve and the root locus of CCF transfer function.Results of simu- lation and experiments are in good agreement which confirm the effectiveness of the proposed grid impedance method.
出处
《电力电子技术》
CSCD
北大核心
2017年第12期46-48,共3页
Power Electronics
基金
国家重点研发计划(2016YFB0900300)
国家电网公司科技项目(NYB17201600332)~~
关键词
电网阻抗
复数滤波器
非特征次谐波
grid impedance
complex coefficient fiher
uncharacteristic harmonic
