Direct Frequency Control Based MPPT Algorithm of LLC Resonant Converter for Photovoltaic System
- Resource Type
- Conference
- Authors
- Zhuang, Yizhan; Liu, Fei; Zhang, Xiangjing; Diao, Xiaoguang; Jiang, Jianbo; Sun, Jianjun
- Source
- 2019 IEEE Energy Conversion Congress and Exposition (ECCE) Energy Conversion Congress and Exposition (ECCE), 2019 IEEE. :3402-3406 Sep, 2019
- Subject
- Aerospace
Fields, Waves and Electromagnetics
Power, Energy and Industry Applications
Resonant converters
Switching frequency
Maximum power point trackers
Photovoltaic systems
Zero voltage switching
LLC resonant converter
MPPT
distributed photovoltaic generation
- Language
- ISSN
- 2329-3748
LLC resonant converter has advantages in efficiency when applied to photovoltaic(PV) system. However, renowned maximum power point tracking(MPPT) algorithms are mostly based on pulse width modulation(PWM) while LLC resonant converter is a pulse frequency modulation(PFM) converter. Using a PWM MPPT method in LLC converter might cause the loss of soft switching characteristic. Therefore, an MPPT algorithm based on PFM is needed. In this paper, a direct frequency control based MPPT algorithm is proposed by analyzing the relationship between switching frequency and voltage of PV array. The parameter design constraints of LLC resonant converter to achieve MPPT is also provided. Experimental results are given to verify the validity of the analysis.