A novel hysteresis power point optimizer for distributed solar power generation

Oleksandr Veligorskyi; Oleksandr Husev; Viktor Shevchenko; Kostiantyn Tytelmaier; Roman Yershov; Roman Kosenko; Dmitri Vinnikov

doi:10.2478/ecce-2018-0002

A novel hysteresis power point optimizer for distributed solar power generation

Authors

Oleksandr Veligorskyi Head of Department, Chernihiv National University of Technology
Oleksandr Husev Associate Professor, Chernihiv National University of Technology
Viktor Shevchenko Ph.D. student, Chernihiv National University of Technology,
Kostiantyn Tytelmaier Ph.D. student, Chernihiv National University of Technology
Roman Yershov Senior Lecturer, Chernihiv National University of Technology
Roman Kosenko Ph.D. student, Tallinn University of Technology
Dmitri Vinnikov Head of the Power Electronics Group, Tallinn University of Technology

DOI:

https://doi.org/10.2478/ecce-2018-0002

Keywords:

DC-DC power converters, maximum power point tracker, photovoltaic systems, renewable energy sources

Abstract

This paper proposes a new photovoltaic panel maximum-power-point optimizer based on a buck converter. It can be connected to the DC-link distributed energy harvesting system that should perform the true maximum-power-point tracking algorithm based on maintaining a constant DC link voltage. The algorithm is based on the sensorless hysteresis control and ensures high efficiency. Three different realizations of proposed hysteresis optimizers have been analyzed in the paper, including operation principle and adjustment of hysteresis intervals. An experimental study has been performed for a portable low-power photovoltaic system in case of different loads and irradiance levels. The efficiency of maximum power point tracking has been calculated analytically for different hysteresis intervals and validated by experiment, which proved a 97-98 % efficiency of tracking for different PV panel temperatures. The proposed solution is recommended to be used in small- and medium-sized power systems where the price of the conventional maximum power point tracking converter is very high and is comparable to the cost of the individual panel

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A novel hysteresis power point optimizer for distributed solar power generation

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