文献类型：期刊文献

中文题名：弱电网条件下的单相频率自适应锁相环

英文题名：Frequency Adaptive Single Phase Grid Synchronization in Weak Grid Condition

作者：杨仁增 张良 李鑫海 胡洛铖

第一作者：杨仁增

机构：[1]贵州理工学院贵州省电力大数据重点实验室,贵州贵阳550003;[2]贵州大学电气工程学院,贵州贵阳550025

第一机构：贵州理工学院大数据学院

年份：2021

卷号：39

期号：9

起止页码：12-15

中文期刊名：机械与电子

外文期刊名：Machinery & Electronics

收录：CSTPCD

基金：贵州省科技基金项目(黔科合基础[2017]1074,黔科合基础[2018]1068)。

语种：中文

中文关键词：弱电网;谐波畸变;频率自适应滤波器;锁相环

外文关键词：weak grid;harmonic distortion;frequency adaptive filters;phase-locked-loop

摘要：为消除直流偏置和谐波畸变对基于二阶广义积分器(SOGI)的单相频率自适应滤波器锁相环跟踪精度的影响,提出了一种级联结构的弱电网条件下的单相频率自适应锁相方法。分析了输入直流偏置对SOGI 2路正交输出信号的影响,以及SOGI锁相环的频率跟踪特性。设计级联结构的双二阶广义积分器(DSOGI)锁相环,前级DSOGI消除单相电网电压采样信号中的直流偏置,生成2路正交电压信号,后级DSOGI分离出2路正交信号中的基波正序分量,并抑制电网谐波畸变对锁相环相角与频率检测精度的影响。功率硬件在环实验装置上的实物实验验证了所提锁相方法的有效性。
In order to reject the influence of dc offset and harmonic distortion on phase detection precision of the frequency adaptive single-phase synchronization based on second order generalized integrator(SOGI),a cascaded structure of the frequency adaptive synchronization was proposed.The different effects of dc offset on the two orthogonal output signals of the SOGI are deduced,and the frequency tracking characteristics of the SOGI are analyzed.In design of the frequency adaptive synchronization with cascaded double SOGI(DSOGI),the prime DSOGI reject dc offset in the single-phase grid voltage sampling signal,and generate two orthogonal voltage signals,the second DSOGI separated the fundamental positive sequence component from the two orthogonal signals,and attenuated the low-order harmonics contained in the grid to improve the detection precision of phase angle and frequency of the synchronization.The experiment show that the proposed synchronization algorithm is effective.The effectiveness of the proposed synchronization algorithm is verified by the physical experiment of the power hardware in loop device.