A Novel Synchronous Reference Frame Frequency-Locked Loop

TL;DR

This paper introduces a new synchronous reference frame frequency-locked loop (SRF-FLL) that improves performance over traditional FLLs by utilizing phase error and small-signal modeling, with verified theoretical and experimental results.

Contribution

A novel SRF-FLL design based on the synchronous reference frame, enhancing performance through phase error utilization and detailed modeling.

Findings

SRF-FLL outperforms conventional FLL in stability and accuracy.

Theoretical analysis confirms the effectiveness of the proposed SRF-FLL.

Experimental results validate the improved performance of the SRF-FLL.

Abstract

This letter proposes a new design of frequency-locked loop (FLL) which is based on synchronous (dq) reference frame instead of stationary ({\alpha}\b{eta}) reference frame. First, a synchronous reference frame FLL (briefly called SRF-FLL0) equivalent to the conventional FLL is proposed. Then the SRF-FLL0 is improved by utilizing the phase error to acquire a better performance. The small-signal modeling and parameter tuning of the improved synchronous reference frame FLL (SRF-FLL) are presented. Finally, the theoretical analysis and experiment results verify the superiority and effectiveness of proposed SRF-FLL.