基于降阶滤波器的锁相方法  

Phase-locked method based on the reduce order filter

作　　者：闵晶妍 陈红兵 MIN Jingyan;CHEN Hongbing(Electrical Engineering Department,Yingkou Institute of Technology,Yingkou,Liaoning 115014,China)

机构地区：[1]营口理工学院电气工程学院,辽宁营口115014

出　　处：《河北工业大学学报》2021年第2期26-29,共4页Journal of Hebei University of Technology

基　　金：辽宁省自然科学基金(20180550042);辽宁省自然科学基金区域创新发展联合基金(2020-YKLH-33);营口理工学院院级科技人才计划项目;营口市博士企业双创项目(QB-2019-19);营口理工学院院级青年科研项目(QNL201807)。

摘　　要：准确、快速检测电网相位是并网变流器的关键技术,目前常用的闭环锁相技术普遍存在动态延时长、滤波算法复杂、在电网受谐波污染时锁相精度低等问题。针对上述不足,研究了降阶滤波器及其分序机理和实现方法,在此基础上,研究了基于降阶滤波器的锁相方法,并整定了环路滤波器的参数。实验结果表明,所研究的锁相技术在电网电压跳变的情况下,相位检测没有暂态过程,锁相精度不受电压幅值突变的影响;在电网中存在3次谐波电压时,锁相精度提高了21%;频率跳变不影响锁相过程和锁相精度,但是暂态过程约为20 ms,同时该锁相环还能检测单相电网的相位,较好地克服了常用的闭环锁相技术存在的问题。The accuracy and rapidly detecting the phase of a grid is a key technology for grid-connected converters.There were some disadvantages in the common close loop PLL,such as a long dynamic response,complicated filter algorithms and low accuracy of the phase locked under distorted utility conditions.According to the above-mentioned disadvantages,the decomposing sequence method based on a reduce order filter,decomposing sequence mechanism and realization way have been analyzed.On that basis,the locked phase method based reduce order filter have been investigated.Parameters of the loop filter have been tuned.Lastly,the studied phase-locked technology has no transient response when the grid voltage dipped;Locked phase accuracy has been enhanced by 21%when the grid voltage component composes of the 3th harmonic wave voltage;The grid frequency fluctuation has no influence on locked phase accuracy and process,but there was a transient process of the 20ms.the investigated phase-locked technology can detect the phase of single-phase grid.The method has overcome the disadvantages of the common close loop PLL.

关 键 词：降阶滤波器 分序算法 环路滤波器 

分 类 号：TM46[电气工程—电器]