计及电网背景谐波的单相系统基波正交信号最优延时构造方法  

Optimal time delay based fundamental orthogonal signal generation method for single-phase system considering grid background harmonics

作　　者：李希年 庞清乐 LI Xinian;PANG Qingle(School of Information and Electronic Engineering,Shandong Technology and Business University,Yantai 264005,China;School of Information and Control Engineering,Qingdao University of Technology,Qingdao 266520,China)

机构地区：[1]山东工商学院信息与电子工程学院,山东烟台264005 [2]青岛理工大学信息与控制工程学院,山东青岛266520

出　　处：《电力自动化设备》2020年第12期198-203,共6页Electric Power Automation Equipment

基　　金：山东省高等学校科技计划项目(J15LN10);山东省高等学校青创科技支持计划项目(2019KJN041);山东工商学院财富管理项目(2019ZBKY054)。

摘　　要：单相并网逆变器的检测与控制中广泛利用延时构造正交信号,经Park变换,将基波交流量变为同步参考坐标系下的直流量。推导了延时构造基波正交信号所导致的电网背景谐波的变化,建立了含有谐波的单相电压利用延时构造基波正交信号所组成系统的解析表达式,详细研究了谐波在该系统中的变化规律及其Park变换后的阶次变化。综合考虑正交信号延时与滤波时间,给出了电网谐波干扰下单相系统基波正交信号的最优延时构造方法。仿真与实验结果证明了理论分析的正确性。The time delay based OSG(Orthogonal Signal Generation)is widely used in the detection and control of single-phase grid-connected inverters,where the fundamental AC signal becomes DC quantity after Park transformation.The variation of grid harmonics caused by the time delay based fundamental OSG is derived,the analytical expression of the system composed by the single-phase voltage with harmonics and time delay based fundamental OSG is established,and the harmonic variation rule and order variation after Park transformation are studied in detail.Taking into account the time of OSG delay and harmonic elimination,the optimal time delay based fundamental OSG method in single-phase system is given.The simulative and experimental results verify the correctness of theoretical analysis.

关 键 词：逆变器 正交信号 延时 谐波分析 PARK变换 滑动平均滤波器 

分 类 号：TM464[电气工程—电器]