Hybrid maximum power point tracking method with variable step size for photovoltaic systems

作者：Hua Chih Chiang^*; Fang Yi Hsiung; Chen Wei Tze

来源：IET Renewable Power Generation, 2016, 10(2): 127-132.

DOI：10.1049/iet-rpg.2014.0403

• maximum power point trackers
• photovoltaic power systems
• solar cell arrays
• hybrid maximum power point tracking method
• variable step size
• photovoltaic system
• MPPT method
• fractional open-circuit voltage method
• FOCV method
• current sensorless method with automodulation
• CSAM
• PV array
• boost converter
• single voltage sensor

A hybrid maximum power point tracking (MPPT) method with variable step size for photovoltaic (PV) systems is proposed. The proposed MPPT method combines a new modified fractional open-circuit voltage (FOCV) method and the current sensorless method with auto-modulation (CSAM) to achieve fast and accurate tracking. This method not only has fast tracking but also automatically adjusts the step size according to the conditions of PV array. A modified FOCV is designed to move the operating points fast to approach the maximum power points. Afterwards, the CSAM is used for fine tuning, thus the PV system with the proposed MPPT can produce a stable and maximum possible output power. The theoretical analysis of the proposed MPPT is provided, and the laboratory prototype was constructed based on a boost converter with only a single voltage sensor. The simulation and experimental results are presented to verify the system performance.

• 出版日期2016-2