Abstract
Photovoltaic (PV) systems produce a significant amount of electrical energy used around the world. The performance of a PV array is affected by temperature, solar insolation, shading and array configuration. Obtainable maximum power generation from PV based energy production systems is only possible with Maximum Power Point Tracking (MPPT) methods. In order to maximize the efficiency of PV energy conversion systems, solar panels and arrays should be operated at maximum power points. At maximum power point, solar arrays generate the electric energy at maximum efficiency and minimum losses. This paper discusses the following issues: (1) what is the effect of MPPT unit in PV systems, (2) two connection methods between solar arrays and buck-boost DC/DC converter with MPPT unit, (3) determine behaviours of PV power generation systems in cloudy and sunny conditions. DOI: http://dx.doi.org/10.5755/j01.eee.21.6.13761
Highlights
Obtaining maximum power and reaching highest efficiency level in photovoltaic panels is an important research topic [1], [2]
In the same case of study, output powers and currents analysed according to current reference that can be changed by illumination level with Maximum Power Point Tracking (MPPT)
The output power of the PVs is mostly based on the irradiation condition, and the irradiation level on each panel in this case is different, each unit of MPPT is to perform according to the MPP of the panel
Summary
Obtaining maximum power and reaching highest efficiency level in photovoltaic panels is an important research topic [1], [2]. The output power from the arrays were converted to DC power with buck-boost converter types. Both of the topologies use a common DC/DC converter with. Two PV panels were connected to a centralized MPPT buck-boost converter. Each panel was connected to a MPPT buck-boost converter in the same PV array configuration. The halogen lamp in this case was to symbolise light whereas the case where some part of the PV is covered with a dark object is to symbolise the cloudy condition In both cases the current and voltage changes were observed. The effects of changeable irradiation over a PV arrays were observed on two alternative modelled systems in order to determine which topology performed better in variable conditions. By utilizing MATLAB simulation, the effects of MPPT in photovoltaic energy conversion were assessed
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