摘要
针对传统基于二阶广义积分器的锁频环(Second-Order Generalized Integrator Based Frequency Locked-Loop,SOGI-FLL)抗直流干扰能力不足的问题,提出一种能够抑制直流偏移的改进型SOGI-FLL设计方案。简要介绍了SOGI-FLL的结构,并量化分析了输入信号中直流分量对SOGI-FLL的锁频输出信号和正交信号对中β轴分量的影响。通过新增一条低通滤波通道,对SOGI-FLL进行结构改进,并结合锁频环结构推导传递函数进行频率特性分析,证明了该改进方案的有效性。利用PSCAD仿真软件,在含直流分量的电网环境下,通过设置多组SOGI-FLL和ESOGI-FLL的对比实验验证了所设计方案的正确性。
Aiming at the traditional second-order generalized integrator based frequency locked-loop has insufficient anti-DC interference ability,an improved SOGI-FLL design scheme considering DC offset suppression is proposed in this paper.Firstly,the structure of SOGI-FLL is briefly introduced,and then,the effects of DC component in input signal on the frequency locking output signal and the orthogonal signal of SOGI-FLL on the mid-betaβaxis component are analyzed.The structure of SOGI-FLL is improved by adding a new low-pass filter channel,and the transfer function is derived from the structure of frequency locked-loop to analyze the frequency characteristics,which verifies the effectiveness of the improved scheme.Finally,PSCAD simulation software is adopted in the power grid environment with DC component,and the correctness of the designed scheme is verified by setting up groups of SOGI-FLL and ESOGI-FLL comparative experiments.
作者
胡挜喆
刘文泽
Hu Yazhe;Liu Wenze(School of Technology,South China University of Technology,Guangzhou 510641,China)
出处
《电测与仪表》
北大核心
2020年第9期52-57,共6页
Electrical Measurement & Instrumentation
基金
国家自然科学基金资助项目(51577073)
广东省自然科学基金资助项目(2017A030313288)。
关键词
二阶广义积分器
锁频环
直流偏移
second-order generalized integrator
frequency locked-loop
DC offset
