摘要
在微电网系统中,通过对电网阻抗的辨识可改善微电网变流器的控制性能,并可用于判断电网并离网状态。为此,基于非特征次谐波注入的电网阻抗估算方法,采用复数滤波器提取电压和电流信号中非特征次谐波进行电网阻抗估算。详述了复数滤波器的设计方法,并从非特征次谐波提取精度和动态性能等方面对复数滤波器的参数设计进行了分析。仿真和实验结果验证了所提电网阻抗估算方法的可行性。
The identification of grid impedance could be used to improve the control performance of power converter in micro-grid and to judge whether micro-grid is grid-connected or islanded. For this purpose, the uncharacteristic harmonic injection is utilized to estimate grid impedance, in which the complex filters are used to extract uncharacteristic harmonics in voltage and current signals. The design method of complex filter is explained in detail, and the parameter design of complex filter is analyzed in the aspects of extraction accuracy of uncharacteristic harmonics and dynamic performance of the complex filter. The feasibility of the proposed grid impedance estimation method is validated by results of simulation and experiments.
出处
《电网技术》
EI
CSCD
北大核心
2013年第10期2796-2801,共6页
Power System Technology
基金
国家863高技术基金项目(2011AA05A306)~~
关键词
电网阻抗
复数滤波器
主动谐波注入
非特征次谐波
grid impedance
complex filters
initiative harmonic injection
uncharacteristic harmonics
