| 1. |
- Blinov, Andrei, et al.
(författare)
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Cell-Level Power Supply for High-Voltage Modular Multilevel Converters
- 2017
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Ingår i: 2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE EUROPE). - : Institute of Electrical and Electronics Engineers (IEEE). - 9789075815276
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Konferensbidrag (refereegranskat)abstract
- Focus is on the design and development of an auxiliary power supply converter for HVDC and FACTS applications, utilising integrated gate-commutated thyristors. Due to relatively high requirements for gate drive power and operating voltage of 2.8 kV, special measures have to be considered when designing such systems. The tapped-inductor buck converter topology was chosen as the first non-isolated conversion stage to perform step-down and regulation functions. The main focus of this study is on the design and operation of autonomous high-voltage switch with increased operating frequency that consists of eight MOSFETs connected in series. Various converter design constrains associated with inductor design and start-up sequences are analysed as well. The results are verified with a 150 W prototype converter.
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| 2. |
- Blinov, Andrei, 1984-, et al.
(författare)
-
Full soft-switching high step-up DC-DC converter for photovoltaic applications
- 2014
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Ingår i: 16th European Conference on Power Electronics and Applications (EPE'14-ECCE Europe), 2014. - Lappeenranta : IEEE conference proceedings.
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Konferensbidrag (refereegranskat)abstract
- In this paper a full soft-switching high step-up DC-DC converter is introduced as an alternative approach to module integrated converters for photovoltaic applications. The presented operation principle and key equations can be used as design guidelines for component and parameter estimation in practical applications. The proposed DC-DC converter was verified by help of simulations and experiments. Power loss analysis based on the semiconductor datasheet values showed that the converter tends to achieve an efficiency of 92.8% at the maximum power point.
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| 3. |
- Blinov, Andrei, et al.
(författare)
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High Gain DC-AC High-Frequency Link Inverter With Improved Quasi-Resonant Modulation
- 2022
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Ingår i: IEEE Transactions on Industrial Electronics. - : Institute of Electrical and Electronics Engineers (IEEE). - 0278-0046 .- 1557-9948. ; 69:2, s. 1465-1476
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Tidskriftsartikel (refereegranskat)abstract
- This article presents a high gain pure sine- wave inverter based on the full-bridge dc-ac high-frequency link cycloconverter topology for telecom or general-purpose applications. The improved quasi-resonant modulation method allows reduction of ringing and turn-off losses of the dc-side switches. This is achieved with minimal energy circulation and requires no multi-mode operation or extra auxiliary clamping circuits. The soft switching can be provided even if relatively large lossless snubber capacitors are connected across the input side transistors. Moreover, two of the switches at the ac side operate at fundamental frequency, while the rest feature zero current turn-off. A 48 V-DC to 230 V-AC, 1.2 kW sine-wave inverter prototype was developed to verify the proposed concept.
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| 4. |
- Blinov, Andrei, et al.
(författare)
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Operation of single-chip MOSFET and IGBT devices after failure due to repetitive avalanche : University in collaboration with industry
- 2015
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Ingår i: Power Electronics and Applications (EPE’15 ECCE-Europe), 2015 17th European Conference on.
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Konferensbidrag (refereegranskat)abstract
- This paper presents analysis of post-failure behaviour of MOSFETs and IGBTs operating in a series connected string. The aim of this experimental study is to analyse the operation of devices in case of sudden loss of controllability, leading to repetitive avalanche conditions at relatively low current and subsequent failure due to overheat. For redundant designs it is important that the devices are locked in stable conducting state after the failure and the string continue its operation.
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| 5. |
- Blinov, Andrei, et al.
(författare)
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Soft-Switching Modulation Method for Full-Bridge DC-AC HF-Link Inverter
- 2019
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Ingår i: 45th annual conference of the ieee industrial electronics society (IECON 2019). - : IEEE. - 9781728148786 ; , s. 4417-4422
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Konferensbidrag (refereegranskat)abstract
- This paper presents an improved modulation method for the cycloconverter stage of high frequency-link DC-AC inverters. By applying the quasi-resonant commutation mode during the entire operating period, the fast and reliable discharge of DC-side capacitances can be provided even if the output current is close to zero. This allows to ensure zero voltage switching (ZVS) conditions for the DC-side transistors, while applying small external snubber capacitors to reduce their turn-off losses. The proposed modulation strategy was significantly simplified and requires no external active auxiliary circuits or multi-mode operation. Moreover, two of the AC-side switches can operate at the fundamental frequency, while the rest operate with zero current switching (ZCS). The proposed modulation method is verified with mathematical analysis, simulation model and experimental prototype of full-bridge HF-link inverter.
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| 6. |
- Chub, Andrii, et al.
(författare)
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CCM and DCM Analysis of Quasi-Z-Source Derived Push-Pull DC/DC Converter
- 2014
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Ingår i: Informacije midem. - 0352-9045. ; 44:3, s. 224-234
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents a steady state analysis of the operation modes of the quasi-Z-source (qZS) derived push-pull DC/DC converter topology. It was derived by the combination of the qZS network and coupled inductors. The output stage of the converter consists of a diode bridge rectifier and an LC-filter. This topology provides a wide regulation range of the input voltage and galvanic isolation. These features fit the requirements for the integration systems of renewable energy sources, such as PV panels, variable speed wind turbines, and fuel cells. A converter can operate in continuous (CCM) and discontinuous conduction mode (DCM). Switching period is divided into four and six intervals for CCM and DCM, respectively. Equivalent circuits and analytical expressions for each interval are presented. The DC gain factor for each mode is derived. To simplify our analysis, coupled inductors were substituted with a model that consists of an ideal transformer and magnetizing inductance. Leakage inductances are neglected because the coupling coefficient in this topology should be close to unity. In DCM the converter operation depends on the active duty cycle and the duty cycle of the zero current condition. Two solutions are possible for the DC gain factor in DCM. It is theoretically impossible to achieve the unity DC gain factor in DCM if the turns ratio of coupled inductors is equal to or more than one. The proposed topology was simulated with PSIM software in two operating points. Experimental verification proves our theoretical and simulation results.
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| 7. |
- Tibola, G., et al.
(författare)
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Multi-cell DC-DC converter with high step-down voltage ratio
- 2015
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Ingår i: 2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015. - : Institute of Electrical and Electronics Engineers (IEEE). - 9781467371506 ; , s. 2010-2016
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Konferensbidrag (refereegranskat)abstract
- The use of high voltage allows a power processing system to operate with low currents, improving efficiency. Nevertheless, final applications usually require low voltage inlet, which can be provided using modular multilevel converters submodules, for instance. However, every submodule's gate-unit requires energy from an isolated low power auxiliary supply. Generally, this is done by using an external converter since it is not practical to directly step-down the high voltage to required levels. In this context, this paper proposes a multi-cell solution based on stacking of buck-boost converters intended to be the first non-isolated stage of an isolated high step-down voltage ratio converter. Analysis and design are presented together with experimental verification of a 200 W rated power converter with 1.5 kV to 3.0 kV input voltage range and a nominal output voltage of 350 V.
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