关键词: 单相Boost型PFC, 锁相环, 锁频环, 谐波抑制与频率自适应

Abstract: To address the issue of increased current harmonics and reduced phase synchronization accuracy in single phase Boost PFC under grid distortion and frequency deviation, an integrated adaptive voltage synchronization scheme based on the Second Order Generalized Integrator Phase Locked Loop/Frequency Locked Loop (SOGI PLL/FLL) is proposed. The scheme employs the SOGI PLL to obtain accurate phase information, while the SOGI FLL estimates and corrects grid frequency in real time, enabling precise fundamental tracking and fast frequency adaptation and improving robustness under non-ideal grid conditions. The structure is incorporated into the dual loop control framework of the Boost PFC, and its performance is validated through system modeling and PLECS simulation. Results show that the method significantly suppresses the third, fifth, and seventh input current harmonics and achieves faster dynamic response with lower frequency estimation error during frequency step changes. The approach effectively enhances power quality performance and dynamic stability of single phase PFC systems and demonstrates strong engineering applicability.

Key words: Single phase Boost PFC, Phase Locked Loop, Frequency Locked Loop, Harmonic suppression and frequency adaptation