基于PRBS信号注入的电网阻抗在线检测方法  

On-line Detection Method of Power Grid Impedance Based on PRBS Signal Injection

作　　者：廖碧莲[1] 程根 宋绍剑[1] 罗任志 林秀清 王腾 LIAO Bilian;CHENG Gen;SONG ShaoJian;LUO Renzhi;LIN Xiuqing;WANG Teng(College of Electrical Engineering,Guangxi University,Guangxi Nanning 530004,China)

机构地区：[1]广西大学电气工程学院,广西南宁530004

出　　处：《广西电力》2018年第1期1-4,21,共5页Guangxi Electric Power

摘　　要：为了实现电网与并网逆变器的稳定运行,提出一种基于PRBS信号注入的电网阻抗在线检测方法。该方法通过并网逆变器向电网注入PRBS扰动信号来获得特定频率的响应电压和扰动电流,然后进行DFT变换,最后得到电网阻抗。仿真结果表明:PRBS注入法对电网的扰动较小,能够更好地测量电网阻抗,检测精度高。In order to realize the stability operation of power grid and grid-connected inverter,an on-line detection method of power grid impedance based on PRBS signal injection is proposed.The method can obtain the response voltage and disturbing current of specific frequency by injecting PRBS disturbance signal to power grid through the grid-connected inverter.Then,DFT transformation is executed.Finally,power grid impedance is obtained.Simulation results show that PRBS injection method has smaller disturbance to power grid and can better measure the impedance of power grid with high detection precision.

关 键 词：并网逆变器 电网阻抗 PRBS 在线检测 

分 类 号：TM464[电气工程—电器]