전기버스 급속충전기의 PI-IP 혼합 제어기를 이용한 AC/DC 컨버터 DC-Link 전압 제어에 관한 연구 = A Study on AC/DC Converter DC-Link Voltage Control Using PI-IP Hybrid Controller of EV Bus Fast Charger

 

전기버스 급속충전기의 PI-IP 혼합 제어기를 이용한 AC/DC 컨버터 DC-Link 전압 제어에 관한 연구 = A Study on AC/DC Converter DC-Link Voltage Control Using PI-IP Hybrid Controller of EV Bus Fast Charger 

A Study on AC/DC Converter DC-Link Voltage Control Using PI-IP Hybrid Controller of EV Bus Fast Charger BY Gyu-Nam Yang 

Department of Electrical Engineering Graduate School, Chonnam National University

 (Supervised by Professor Sung-Jun Park) 

 (Abstract) 

The supply of electric vehicles (xEVs) in the transport sector is increasing in response to the global demand for reducing carbon dioxide emissions. However, due to the gradual slow dissemination, the emission is rather difficult, increasing every year. The reasons for this include a relatively high price compared to an internal combustion engine vehicle, limiting the driving range on a single charge, and insufficient charging station. In such a situation where the spread is slow, the method of preferentially eco-friendly public transportation, which has a higher usage rate than passenger cars, is being accepted. In particular, EV buses, which account for a large portion of public transportation, are rapidly spreading. Accordingly, there is a growing demand for the introduction of a large-capacity fast charger that can charge a battery of several hundred kW within 30 minutes. In general, the structure of a fast charger consists of an AC/DC converter and a 2-stage of an isolated DC/DC converter. AC/DC converter converts system 3-phase AC power to DC power and improves power factor. The isolated DC/DC converter uses the rectified DC output to control the voltage and current required by the EV bus battery to directly charge the battery. AC/DC converters have several topologies. Among them, the fast charger for charging is a 3-level converter, and the Vienna Rectifier has many advantages. However, the Vienna Rectifier is a unidirectional converter and it is difficult to control during no-load or light-load operation. In particular, there is a disadvantage in that it is unstable during initial operation and when the battery is fully charged. Several methods have been proposed to solve this problem. Burst mode control [1,2], which is a representative method, has a problem in that it adversely affects the performance of the secondary-side converter and the battery being charged due to the large DC-Link voltage ripple. As another method, a control method with a hysteresis loop was reviewed [3], However, the problem of induced high inrush current is not effectively improved.[4] Therefore, in this paper, hardware configuration and voltage control method for stable control of Vienna Rectifier are presented. Vienna Rectifier is a unidirectional converter characteristic, but there is instability of control under light load conditions. Accordingly, we propose a hardware configuration that can reduce losses by using it as a system power source instead of a conventional dummy resistor. In addition, the existing PI controller has a large transient state due to its quick response when a sudden load change occurs, and the recovery of the steady state may be delayed in the Vienna Rectifier. To solve this problem, In order to secure reliability in the entire load section, we propose a voltage control method that determines the setting parameters of the PI-IP hybrid controller using the load current. The proposed method proved the validity of the hardware configuration and control algorithm of Vienna Rectifier presented through PSIM simulations and experiments.

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Telyakovsky S.A. Coleção de problemas de teoria das funções de uma variável real

 

Design and evaluation of automotive power module : 650V GaN E-HEMT with meandered interconnection and integrated motor-inverter power module---GaN E-HEMT 소자용 인터커넥션과 자동차용 모터-인버터 통합구조 파워모듈의 설계 및 평가

Design and evaluation of automotive power module : 650V GaN E-HEMT with meandered interconnection and integrated motor-inverter power module By Jihwan Seong

 A thesis submitted to the graduate school of Hanyang University for the degree of Doctor of philosophy Department School of Hanyang university 

ABSTRACT 

 With increasing demand in automotive fuel efficiency and ever-strengthening global carbon dioxide emission regulations, electrification has become an indispensable trend. Especially in the automobile industry, miniaturization and performance are other major challenges, and they should be considered with electrification as goals in the equipment design stage. Because of the challenges, a tailored design and evaluation process is necessary for power modules that perform high-level power conversion for motor driving. This dissertation attempts to present the design and evaluation of power modules used in electrified vehicles. The dissertation starts with the configuration of a power module and a description of each module component. A power module includes power devices and packaging components. Among the power devices, wide bandgap (WBG) devices have recently been widely used in power modules, and their characteristics are described. In addition, the roles of packaging components and their design considerations are presented. Because the power module treats electric power, electrical verification is important. Electrical verification methods based on the finite element method (FEM) and circuit simulation tools are introduced. The aforementioned design and evaluation methods are applied to the proposed models of two applications. First, a new interconnection design is proposed. The interconnection is specially designed for the GaN E-mode High-electron-mobility Transistor (E-HEMT). The design process for the proposed interconnection is presented in detail, and a parametric study is conducted considering major design variables, to achieve minimum parasitic inductance and thermal resistance objectives. The expected advantages of the optimal interconnection design, as obtained from the parametric study, are described. To verify these expected advantages, various simulations and experiments are conducted. A prototype of the proposed interconnection is fabricated and experimentally evaluated. Secondly, the inverter power module is designed and analyzed to be applied in the motor-inverter integrated structure of the electric compressor and starter-generator components used in 48-V mild hybrid vehicle system. An improved power module design is proposed, and it demonstrates all of the electrical and thermal performances required in the integrated structure. The performances are evaluated by conducting electrical/thermal simulations and experiments. As a result, the superiority of the proposed interconnection for GaN E-HEMTs and the improved power module considering the integrated structure was demonstrated, and their evaluation processes were validated based on the similarity between the simulation and experimental results.

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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