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Design and evaluation of a low-cost solar simulator and measurement system for low-power photovoltaic panels

Walczak Marcin, Bychto Leszek, Kraśniewski Jarosław, Duer Stanisław

Metrology and Measurement Systems

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2022

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Vol. 29, nr 4

685--700

EN

Research related to photovoltaic panels comprises different topics starting with modelling solar cells, finding new maximum power point tracking (MPPT) algorithms, testing existing ones or designing of DC/DC converters for MPPT systems and microgrids that incorporate photovoltaic energy sources. In each of the examples above a deep knowledge of photovoltaic panels is required, as well as a reliable measurement system that can deliver continuous, stable light with enough power to meet standard test conditions (STC) and that can ensure repeatable results. Therefore this paper presents a low-cost solar simulator with a microcontroller-based measurement system, that can be used for various measurements of low-power photovoltaic panels.

2

Large-signal input characteristics of selected DC–DC switching converters. Part I. Continuous conduction mode

Janke Włodzimierz, Bączek Maciej, Kraśniewski Jarosław, Walczak Marcin

Archives of Electrical Engineering

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2020

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Vol. 69, nr 3

739--750

EN

Large-signal input characteristics of three DC–DC converter types: buck, boost and flyback working in the continuous conduction mode (CCM), obtained by simulations and measurements are investigated. The results of investigations are presented in the form of the analytical formulas and the exemplary results of the measurements and two forms of simulations: based on the full description of the converter components and on the averaged models. The parasitic resistances of the converter components are included in the simulations and their influence on the simulation results is discussed.

3

Large-signal input characteristics of selected DC–DC switching converters, Part II. Discontinuous conduction mode

Janke Włodzimierz, Bączek Maciej, Kraśniewski Jarosław, Walczak Marcin

Archives of Electrical Engineering

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2020

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Vol. 69, nr 4

801--813

EN

Large-signal input characteristics of three DC–DC converter types: buck, boost and flyback working in the discontinuous conduction mode (DCM), obtained by precise large signal PSpice simulations, calculations based on averaged models and measurements are presented. The parasitic resistances of the converter components are included in the simulations. The specific features of the input characteristics in the DCM and the differences between the continuous conduction mode (CCM) and DCM are discussed.

4

Methods of DC/DC converter transfer function measurements, based on data acquired in the time domain

Walczak Marcin

Metrology and Measurement Systems

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2019

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Vol. 26, nr 4

661--671

EN

The measurement of frequency characteristics, like magnitude and phase, related to a specific transfer function of DC–DC converters, can be a difficult task - especially when the measured signal approaches the boundary of a small-signal model validity (i.e. 1/3 of the switching frequency fS ). It is hard to find a paper where authors mention the measurement techniques they use to draw frequency characteristics. Meanwhile the presence of noise in the output signal does not enable to directly measure the gain and the phase shift between the input and output signals. In such situations additional analysis is required in order to achieve a reliable result. This paper contains a description of a few methods that can be used to analyse measured signals in order to determine the gain and the phase shift of a specific transfer function. They enable to verify mathematical models in a wide range of frequencies (up to 1/3 fS ). The methods use signals measured in the time domain and can be implemented in mathematical software such as Matlab or Scilab.