Magnetic design of a 3-phase SiC-based PV inverter with DC-link referenced output filter ALEJANDRO RUJAS1,2, ITSASNE LANDABURU1, VICTOR M. LOPEZ-MARTIN1 AND OSCAR BARAMBONES2,

 Magnetic design of a 3-phase SiC-based PV inverter with DC-link referenced output filter BY

 ALEJANDRO RUJAS1,2, ITSASNE LANDABURU1, VICTOR M. LOPEZ-MARTIN1 AND OSCAR BARAMBONES2, 1IKERLAN 

Technology Research Centre, Basque Research and Technology Alliance (BRTA), Arrasate-Mondragon, Basque Country, Spain (e-mail: arujas@ikerlan.es) 2

Departament of Automatic Control and System Engineering, Engineering School, University of the Basque Country UPV/EHU, Vitoria, Basque Country, Spain 

 This work was supported in part by the European Union’s Horizon 2020 research and innovation programme funding, under the grant agreement number 783158 

ABSTRACT 

The use of Silicon carbide (SiC) devices represents an improvement in terms of size, weight and efficiency of power converters. However, SiC-based solutions present high dv/dt and di/dt on the switching events, increasing the common-mode noise injected into the grid. To reduce the common-mode noise, three-phase inverters with a DC-link referenced output filter are widely considered in photovoltaic (PV) inverters connected to the grid. However, if the filter is DC-link referenced the inductor ripple is larger, and this must be considered for the AC inductor filter design. This work shows, on a PV inverter, the impact of that DC-link referenced filter on the current ripple of the inductor, and the improvement achieved with the use of SiC devices, increasing the switching frequency. A comparison in terms of weight, size, losses and materials costs is presented for different core materials and configurations.

VIEW FULL TEXT: https://www.researchgate.net/publication/369125848_Magnetic_design_of_a_3-phase_SiC-based_PV_inverter_with_DC-link_referenced_output_filter

Magnetic Design and Experimental Evaluation of a Commercially Available Single Integrated Transformer in Three-phase LLC Resonant Converter-Mostafa Noah, Student Member, IEEE, Shota Kimura, Jun Imaoka, Member, IEEE, Wilmar Martinez, Member, IEEE, Shun Endo, Masayoshi Yamamoto, Member, IEEE and Kazuhiro Umetani Member, IEEE,

 

Magnetic Design and Experimental Evaluation of a Commercially Available Single Integrated Transformer in Three-phase LLC Resonant Converter-Mostafa Noah, Student Member, IEEE, Shota Kimura, Jun Imaoka, Member, IEEE, Wilmar Martinez, Member, IEEE, Shun Endo, Masayoshi Yamamoto, Member, IEEE and Kazuhiro Umetani Member, IEEE, 

M. Noah, J. Imaoka and M. Yamamoto are with the Power Electronics Lab of Nagoya University, Furo-cho, Chikusa-ku, Japan. (email: mostafa.noah@ieee.org; imaoka@nuee.nagoya-u.ac.jp; m.yamamoto@imass.nagoya-u.ac.jp) S. Kimura and S. Endo are with the Department of Mechanical, Electrical and Electronic engineering, Shimane University, 1060 Nishikawatsu, Matsue, Japan. 

 Abstract—Multi-phase topologies are preferably employed in power conversion systems to lessen the per phase circuit current, conduction losses, devices thermal stresses, and to reduce the output current ripples. Multi-phase LLC resonant dc/dc converter usually possess a number of magnetic cores equal to the number of phases. These magnetic cores are the major contributors to supply volume, weight, and size. For these reasons, circuit designers tend to select the topologies that have a minimal number of magnetic cores. In this paper, the authors aim to promote the industrial applications of the three-phase LLC resonant converter by integrating three transformers into a single, commercially available, magnetic core to reduce the volume, weight, and cost of the power converter. A comprehensive magnetic analysis for the three-phase integrated transformer is conducted. FEM Simulation and experimental tests are carried out to validate the proper operation of the integrated transformer utilized in a 390/12V-500W prototype. Furthermore, the power losses distribution has been presented. The proposed integrated transformer has been proven efficient, and it realized a uniform thermal distribution along the core compared to the three discrete transformers.

VIEW FULL TEXT: https://lirias.kuleuven.be/retrieve/514840

Electric vehicle charging station circuit architecture-Arquitetura do Circuito da estação de carregamento de veiculos elétricos-電動汽車充電站電路架構

 

Modular Multiport Power Converter Topologies for Electric Vehicle Charging Stations-by Dao,Ngoc Dat-Presented as Ph.D. Thesis Graduate School of Yeungnam University August 2021 Department of Electrical Engineering Major in Control and Electric Machinery  Power Conversion

 

Modular Multiport Power Converter Topologies for Electric Vehicle Charging Stations Advisor: Professor Dong-Choon Lee Presented as Ph.D. Thesis Graduate School of Yeungnam University by Ngoc Dat Dao August 2021 Department of Electrical Engineering Major in Control and Electric Machinery  Power Conversion 

ABSTRACT

 The main objective of this thesis is to develop converter topologies with high efficiency and low cost for fast charging stations. Based on the investigation of different power conversion structures for fast charging stations, new topologies have been derived, which can offer additional benefits to EV fast charging stations. Firstly, a novel isolated three-port DC/DC converter is proposed, which is based on a series resonant converter (SRC) and a dual active bridge (DAB) converter for electric-vehicle (EV) charging stations with fast and slow charging functions. With this three-port structure, the proposed converter has fewer components, which results in lower system cost and volume compared with separate charger systems. A simple control method using phase shift and frequency modulations was developed to control the output power of the fast and slow charging ports simultaneously. An optimal phase shift angle was also derived to minimize the transformer current for when only the DAB converter is operated for slow charging. To verify the converter operation, a 5-kW SiC-based prototype with a power density of 2.74-kW/dm3 was built and tested with an input voltage of 600-V. A high efficiency performance over a wide output voltage range has been achieved, and the peak efficiency is 98.2% at the rated conditions. Secondly, a half-bridge bidirectional isolated matrix-based AC/DC converter is proposed for compact AC/DC power stages in fast charging stations. The converter can control not only the DC voltage or current, but also the power factor of the AC current with a single conversion stage, which helps to achieve a higher power density with a lower complexity. The converter operates with zero-voltage switching (ZVS) or zero-current switching (ZCS) in all switches. Hence, the switching frequency of the converter can be increased higher, leading to smaller passive components. Besides the simple circuit, the modulation scheme derived from time domain analyses is also easy to implement. The proposed topology has been verified by experimental results for a 2-kW SiC-based prototype. A high efficiency of 96.8 % was achieved at a full load condition. The current THD is lower than 4 % and the power density is 1.8-kW/dm3. Furthermore, an experiment for two modules has been carried out to demonstrate the feasible of the proposed converter for modular SST-based charging stations. Finally, a novel semi-modular three-phase AC/DC structure is proposed for SST-based fast charging stations. The proposed system employs single-stage indirect matrix-based AC/DC converters. A single full-bridge rectifier is used for each phase of the medium voltage (MV) grid so that each AC/DC module does not need a voltage rectifier. As a result, the number of semiconductor devices in the proposed system is reduced significantly compared with other existing SST-based systems. A decentralized control scheme without high-speed communication has been developed to regulate the input and output currents while keeping the voltages of each module balance. A design of a 360-kW system has been carried out to evaluate the efficiency of the proposed system, which is 97.7 % at rated power. With delta connection in three-phase system, a third harmonic current can be injected to the phase currents to increase the output current and power by 15 %. Simulation results for a 360-kW 3.3-kV system are provided to verify the performance of the proposed system. Finally, a 3-kW hardware prototype has been built and tested to demonstrate the feasibility of the proposed system.

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http://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=a64dd3f76ab854dcffe0bdc3ef48d419&keyword=STATION%20CHARGING%20ELECTRIC%20VEHICLE%20DC-DC

Mercado da eletromobilidade: mais oportunidade de negócio -Estúdio Intelbras Intersolar SP-2023

 

Palestra ministrada pelo Eng. Jairo Alves Ferreira e Silva - Analista de Produtos e Negócios da INTELBRAS na INTERSOLAR BRASIL 29 à 31 DE AGOSTO 2023 – SÃO PAULO, BRASIL-Intersolar South America Sao Paulo on 29 to 31 August 2023.