Thursday, August 17th, 2017

Programmable energy source emulator for photovoltaic panels considering partial shadow effect

Available online 28 February 2013
Publication year: 2013
Source:Energy

The aim of this paper is to study and produce a programmable emulator for photovoltaic panels. A uniform solar illumination model, a partially shaded model with two photovoltaic modules in series and a partially shaded model with two photovoltaic modules in parallel are proposed in this paper. Solar illumination and ambient temperature can be set on the emulator to emulate the behavior of a photovoltaic panel and to explore the effect of its being polluted by dust, shaded by clouds or solar oblique incidence. When making the physical models, a digital signal processor is used to calculate the quiescent points of the photovoltaic panels according to the load resistance and characteristics of the photovoltaic panels, and a DC (direct current)/DC buck power converter is adopted to adjust the output of the emulator in accordance with the quiescent points. To reduce the DSP’s (digital signal processor) calculation burden, a characteristic curve segmentation method is proposed. This study successfully develops a 300 W/60 V emulator for photovoltaic panels under uniform solar illumination and partially shaded conditions. The load is changed over and over again so as to sketch the V – P curve and confirm the feasibility of the emulator.

Highlights

► We produce a programmable emulator having the characteristics of PV (photovoltaic) panels. ► We propose the characteristic curve segmentation method to reduce the calculation burden. ► A uniform solar illumination model is emulated. ► A partially shaded model with two PV modules in series is emulated. ► A partially shaded model with two PV modules in parallel is emulated.


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