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

© The Institution of Engineering and Technology
Received 21/11/2014, Accepted 21/07/2015, Revised 01/07/2015, Published 01/02/2016

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.

Inspec keywords: solar cell arrays; maximum power point trackers; photovoltaic power systems

Other keywords: single voltage sensor; fractional open-circuit voltage method; CSAM; PV array; hybrid maximum power point tracking method; FOCV method; photovoltaic system; current sensorless method with automodulation; MPPT method; boost converter; variable step size

Subjects: DC-DC power convertors; Solar power stations and photovoltaic power systems; Solar cells and arrays

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