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RISS 인기검색어
- 검색키워드
- 저자 : Tamas Kerekes (검색결과 4 건)
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Rostami, Sajad,Abbasi, Vahid,Kerekes, Tamas The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.4
In this paper, a DC-DC converter is proposed based on the Cuk converter. The proposed converter has high efficiency and it can be used in multilevel DC-DC converters. A reduction of the inductors size in comparison to Cuk converter and a reduction in the inductors resistance negative effects on efficiency are the important points of the proposed converter. Its voltage ripple is reduced when compared to other converters. Its output voltage has a high quality and does not contain spikes. A theoretical analysis demonstrates the positive points of the proposed converter. The design and analysis of the converter are done in continues conduction mode (CCM). Experiments confirm the obtained theoretical equations. The proposed converter voltage gain is similar to that of a conventional Boost converter. As a result, they are compared. The comparison illustrates the advantages of the proposed converter and its higher quality. Furthermore, a prototype of the proposed converter and its combination with a 2x multiplier are built in the lab. Experimental results validate the analysis. In addition, they are in good agreements with each other.
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Modified Quasi-Z-Source Inverter with Model Predictive Control for Constant Common-Mode Voltage
Wenjie Liu,Yongheng Yang,Tamas Kerekes 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
The common-mode voltage (CMV) of transformerless inverters in photovoltaic system should be properly addressed. The conventional CMV reduction methods for voltage source inverters should be modified when applied to the quasi-Z-source inverters with shoot-through states. The shoot-through states in a quasi-Z-source inverter may lead to high-frequency harmonics in the CMV, thus inducing severe leakage currents. Hence, this paper analyzes the CMV in the quasi-Z-source inverter. More importantly, a modified quasi-Z-source inverter that can achieve a constant CMV through model predictive control is discussed. Furthermore, redundant switching vectors are added to reduce the computation burden when the model predictive control is adopted. Simulations are presented to validate the CMV reduction methods.
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Lorand Bede,Ghanshyamsinh Gohil,Tamas Kerekes,Remus Teodorescu 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
A typical application for parallel connected converters is in multi megawatt wind turbine systems. Manipulating the interleaving angle between the Pulse Width Modulated (PWM) carrier waves of each converter can result in reduced grid and DC link current ripple, thus the passive components from the DC link and grid filter can be minimized. In previous studies the optimization of the interleaving angle for either the grid current Total Harmonic Distortion (THD) or the DC link current ripple has been made. In this study a compromise is made in order to maintain a THD of the grid current in a level that complies with the standards, while in the DC link the current ripple is reduced. The dependency of the grid current THD and the DC link current ripple on the interleaving angle were determined by simulations. The results were also validated on a hardware setup.
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Sajad Rostami,Vahid Abbasi,Tamas Kerekes 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.4
In this paper, a DC-DC converter is proposed based on the Cuk converter. The proposed converter has high efficiency and itcan be used in multilevel DC-DC converters. A reduction of the inductors size in comparison to Cuk converter and a reduction inthe inductors resistance negative effects on efficiency are the important points of the proposed converter. Its voltage ripple isreduced when compared to other converters. Its output voltage has a high quality and does not contain spikes. A theoreticalanalysis demonstrates the positive points of the proposed converter. The design and analysis of the converter are done incontinues conduction mode (CCM). Experiments confirm the obtained theoretical equations. The proposed converter voltagegain is similar to that of a conventional Boost converter. As a result, they are compared. The comparison illustrates theadvantages of the proposed converter and its higher quality. Furthermore, a prototype of the proposed converter and itscombination with a 2x multiplier are built in the lab. Experimental results validate the analysis. In addition, they are in goodagreements with each other.
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