A New Orthogonal Signal Generator with DC Offset Rejection for Single-Phase Phase Locked Loops

作者：Huang, Xiaojiang; Dong, Lei^*; Xiao, Furong; Liao, Xiaozhong

来源：Journal of Power Electronics, 2016, 16(1): 310-318.

DOI：10.6113/JPE.2016.16.1.310

• Adaptive filter
• DC offset
• Least mean square
• Orthogonal signals generator
• Phase locked loop

This paper presents a new orthogonal signals generator (OSG) with DC Offset rejection for implementing a phase locked loop (PLL) in single-phase grid-connected power systems. An adaptive filter (AF) based on the least mean square (LMS) algorithm is used to constitute the OSG in this study. The DC offset in the measured grid voltage signal can be significantly rejected in the developed OSG technique. This generates two pure orthogonal signals that are free from the DC offset. As a result, the DC offset rejection performance of the presented single-phase phase locked loop (SPLL) can be enhanced. A mathematical model of the developed OSG and the principle of the adaptive filter based SPLL (AF-SPLL) are presented in detail. Finally, simulation and experimental results demonstrate the feasibility of the proposed AF-SPLL.

• 出版日期2016-1
• 单位北京理工大学