基于频率自适应滤波器的单相锁相环-《郑州大学学报(工学版)》

文章信息/Info

Title:: Single Phase Phase-locked Loop Based on Self-adaptive Frequency Filter

Author(s):: CHEN Hong-bing; MIN Jing-yan; School of Physics and Electronic Engineering，Hubei University of Artsand Sciences，Xiangyang 441053，China

Keywords:: self-adaptive frequency filter; single phase phase-locked-loop; frequency performance ; steady-stateprecision ; cut frequency

摘要:: 单相电网的锁相自由度不足和电网频率变化导致相位检测存在稳态误差,针对上述问题,研究了一种基于频率自适应滤波器的锁相环.首先分析了滤波器的特性及其频率自适应机制,然后阐述了锁相环控制系统的关键参数整定方法,最后对所提的锁相环进行了仿真研究.研究结果表明:基于频率自适应滤波器的单相锁相环能够精确检测电网的相位和频率,并能有效消除因电网频率变化而导致的相位检测误差.电网含谐波电压和频率变化时的仿真结果均证明了所研究锁相环的可行性和有效性.

Abstract:: There were detecting errors by a grid frequency ’s varying and not enough to lock phase free degreefor a single phase grid. In view of the above mentioned difficulties,the single phase phase-locked loop ( SP-PLL.) based on a self-adaptive frequency filter (SFF) was researched. Firstly,performances and self-adaptivelaw of the SFF were analyzed,and then the key parameters of the phase-locked loop were tuned to get the opti-mum performance. Finally,the researched phase-locked loop was simulated and investigated. Research resultshave proved the single phase phase-locked loop base on a SFF can precisely detect the phase and the frequen-cy of a single phase grid,and the error of detecting phase brought by the frequency varying has been elimina-ted. The correctness and the feasibility of the proposed phase-locked loop were verified through the simulateresults in the distorted grid and the frequency varying grid.