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1
Content available Literature survey of interleaved DC-DC step-down converters for proton exchange membrane electrolyzer applications
Guida Vittorio, Guilbert Damien, Douine Bruno
Transactions on Environment and Electrical Engineering
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2019
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Vol. 3, No. 1
33--43
EN
Recently, the use of electrolyzers for hydrogen production through water electrolysis is of great interest in the industrial field to replace current hydrogen production pathways based on fossil fuels (e.g. oil, coal). The electrolyzers must be supplied with a very low DC voltage in order to produce hydrogen from the deionized water. For this reason, DC-DC step-down converters are generally used. However, these topologies present several drawbacks from output current ripple and voltage gain point of view. In order to meet these expectations, interleaved DC-DC step-down converters are considered as promising and interesting candidates to supply proton exchange membrane (PEM) electrolyzers. Indeed, these converters offer some advantages including output current ripple reduction and reliability in case of power switch failures. In addition, over the last decade, many improvements have been brought to these topologies with the aim to enhance their conversion gain. Hence, the main goal of this paper is to carry out a thorough state-of-the-art of different interleaved step-down DC-DC topologies featuring a high voltage gain, needed for PEM electrolyzer applications.
2
Content available The effect of space vector modulation algorithm on characteristics of three-phase voltage inverter for drives of optical telescopes
Tomasov V., Usoltsev A., Zolov P., Gribanov P.
Bulletin of the Polish Academy of Sciences. Technical Sciences
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2017
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Vol. 65, nr 5
629--637
EN
The effect of space vector modulation algorithm on magnitude of current vector ripples was considered on the mathematical model of a three-level three-phase voltage inverter with symmetric active inductive load. Limitations on the use of such inverters as a power supply for precision drive of optical telescopes were specified.
3
Content available Neural network based adaptive state feedback controller for inverter with voltage matching circuit
Niewiara Ł., Tarczewski T., Grzesiak L. M.
Poznan University of Technology Academic Journals. Electrical Engineering
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2014
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No. 80
231--238
EN
This paper describes a discrete adaptive state feedback controller used to load current control in terms of variable DC voltage of inverter. Controller was designed by using linear quadratic optimization method. Adaptive LQR was used because of non-stationarity of the control system caused by Voltage Matching Circuit - VMC. Gain values of the adaptive controller were approximated by using an artificial neural network. The VMC was realized as an additional buck converter integrated with the main inverter. As the load of the 2-level inverter a 3-phase symmetric RL circuit was used. Simulation tests show the behavior of the load current regulation during DC bus voltage level step changes. The dependence between current RMS value and inverter DC bus voltage level was also shown. Simulation test was made by using Matlab Simulink and PLECS software.
4
Content available Based on neural network adaptive linear quadratic regulator for inverter with voltage matching circuit
Niewiara Ł., Tarczewski T., Grzesiak L.M.
Computer Applications in Electrical Engineering
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2014
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Vol. 12
434--443
EN
This paper describes a discrete adaptive linear quadratic regulator used to load current control in terms of variable DC voltage of inverter. Controller was designed by using linear quadratic optimization method. Adaptive LQR was used because of non-stationarity of the control system caused by Voltage Matching Circuit - VMC. Gain values of the adaptive controller were approximated by using an artificial neural network. The VMC was realized as an additional buck converter integrated with the main inverter. As the load of the 2-level inverter a 3-phase symmetric RL circuit was used. Simulation tests show the behavior of the load current regulation during DC bus voltage level step changes. The dependence between current RMS value and inverter DC bus voltage level was also shown. There were also made a comparison of the traditional 2-level inverter structure with the modified structure uses VMC. Simulation test was made by using Matlab Simulink and PLECS software.
5
Content available remote Ripple estimation in active power filters
Mikołajuk K., Toboła A.
Przegląd Elektrotechniczny
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2011
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R. 87, nr 5
111-115
EN
The paper presents the analytical method of ripple estimation in active power filters. The method is based on an average model of PWM voltage source inverter. The formulae for the ripple magnitude are derived for single-phase and three-phase three-leg structures. Numerical examples for filters generating third and fifth order harmonics are presented. The example with reactive component of fundamental harmonic is considered as well.
PL
Przedstawiono analityczną metodę estymacji tętnienia prądu wynikającego z przełączeń obwodu w aktywnych filtrach energetycznych. Metoda opiera się na uśrednionych modelach z modulacją PWM. Odpowiednie formuły analityczne zostały opracowane dla układu jednofazowego i trójfazowego. Wykonano obliczenia dla układu generującego trzecią i piątą harmoniczną oraz układu generującego składową bierną harmonicznej podstawowej.
6
Content available remote Ripple Analysis for Three-Phase Four-Leg Active Power Filters
Mikołajuk K., Toboła A.
Przegląd Elektrotechniczny
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2011
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R. 87, nr 11
212-216
EN
The paper presents the analytical method of ripple estimation in active power filters. The method is based on an average model of PWM voltage source inverter. The formulae for the ripple magnitude are derived for three-phase four-leg structures. The numerical example for filters generating third order harmonics is presented.
PL
Przedstawiono analityczną metodę estymacji tętnienia prądu wynikającego z przełączeń obwodu w aktywnych filtrach energetycznych. Metoda opiera się na uśrednionych modelach z modulacją PWM. Odpowiednie formuły analityczne zostały opracowane dla układu trójfazowego czteroprzewodowego. Wykonano obliczenia dla układu generującego trzecią harmoniczną prądu.
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