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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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.

Electric Vehicles Charging Stations’ Architectures, Criteria, Power Converters, and Control Strategies in Microgrids Dominic Savio Abraham 1 , Rajesh Verma 2, Lakshmikhandan Kanagaraj 3, Sundar Rajan Giri Thulasi Raman 4 , Narayanamoorthi Rajamanickam 1 , Bharatiraja Chokkalingam 1,* , Kamalesh Marimuthu Sekar 5 and Lucian Mihet-Popa

Electric Vehicles Charging Stations’ Architectures, Criteria, Power Converters, and Control Strategies in Microgrids by 

Dominic Savio Abraham 1ORCID,Rajesh Verma 2,Lakshmikhandan Kanagaraj 3,Sundar Rajan Giri Thulasi Raman 4ORCID,Narayanamoorthi Rajamanickam 1ORCID,Bharatiraja Chokkalingam 1,*ORCID,Kamalesh Marimuthu Sekar 5 andLucian Mihet-Popa 6ORCID 1 Department of Electrical and Electronics Engineering, SRM Institute of Science and Technology, Chennai 603203, India 2 Department of Electrical Engineering Department, King Khalid University, Abha 62529, Saudi Arabia 3 Department of Electrical and Electronics Engineering, Adhiparasakthi College of Engineering, Kalavai 632506, India 4 Department of Electrical and Electronics Engineering, Sathyabama Institute of Science and Technology, Chennai 600119, India 5 Department of Electrical and Electronics Engineering, Kongu Engineering College, Tamilnadu 638060, India 6 Faculty of Engineering, Østfold University College, Kobberslagerstredet 5, 1671 Fredrikstad, Norway 

 Abstract 

The usage of electric vehicles (EV) has been increasing over the last few years due to a rise in fossil fuel prices and the rate of increasing carbon dioxide (CO2) emissions. EV-charging stations are powered by existing utility power grid systems, increasing the stress on the utility grid and the load demand at the distribution side. DC grid-based EV charging is more efficient than AC distribution because of its higher reliability, power conversion efficiency, simple interfacing with renewable energy sources (RESs), and integration of energy storage units (ESU). RES-generated power storage in local ESU is an alternative solution for managing the utility grid demand. In addition, to maintain the EV charging demand at the microgrid levels, energy management and control strategies must carefully power the EV battery charging unit. In addition, charging stations require dedicated converter topologies, control strategies, and need to follow set levels and standards. Based on EV, ESU, and RES accessibility, different types of microgrid architecture and control strategies are used to ensure optimum operation at the EV-charging point. Based on the above said merits, this review paper presents different RES-connected architecture and control strategies used in EV-charging stations. It highlights the importance of different charging station architectures with current power converter topologies proposed in the literature. In addition, a comparison of microgrid-based charging station architecture with its energy management, control strategies, and charging converter controls are also presented. The different levels and types of charging stations used for EV charging, in addition to controls and connectors used, are also discussed. An experiment-based energy management strategy was developed to control power flow among the available sources and charging terminals for the effective utilization of generated renewable power. The main motive of the EMS and its control is to maximize the usage of RES consumption. This review also provides the challenges and opportunities in EV-charging, and parameters in selecting appropriate charging stations.

 VIEW FULL TEXT:  https://www.mdpi.com/2079-9292/10/16/1895

A Low Voltage Single Phase Online Uninterruptible Power Supply System Based on APFC and Fuzzy PID Algorithm-Shengxian Xu 1, Chen Li 2, Yuru Wang 1,*, Baoying Li 1 1School of Information Science and Engineering, Dalian Polytechnic University, Dalian 116034, P.R China 2School of Electrical Engineering and Telecommunications, University of New South Wales (UNSW Sydney),

A Low Voltage Single Phase Online Uninterruptible Power Supply System Based on APFC and Fuzzy PID Algorithm

Shengxian Xu 1, Chen Li 2, Yuru Wang 1,*, Baoying Li 1

1 School of Information Science and Engineering, Dalian Polytechnic University, Dalian 116034, P.R China 

2 School of Electrical Engineering and Telecommunications, University of New South Wales (UNSW Sydney), NSW 2052, Australia

ABSTRACT 

The Uninterruptible Power Supply (UPS) is a kind of power supply with electric energy storage, but most UPS systems bring harmonic pollution to the grid, and the power factor is inaccurate in the boost circuit, the output voltage is unstable. Therefore, an active power factor correction circuit (APFC) based on the current and voltage double closed-loop structure is designed in the boost circuit; besides, the fuzzy PID control algorithm is also proposed in the inverter circuit. The effectiveness of the proposed method can be verified by the computer simulation and real experiments, and there are four main results as follows. Firstly, the actual power factor of the UPS system can reach more than 0.996 with APFC correction circuit; then, the UPS system has the strong robustness and the shorter response time; in addition, the voltage regulation rate of the system remains at 0.083% and the load regulation rate is around 0.056%. Finally, the designed UPS system can provide the stable 36V ± 0.2V (50 ± 0.2Hz) AC power.

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https://www.researchgate.net/publication/356774254_A_Low_Voltage_Single_Phase_Online_Uninterruptible_Power_Supply_System_Based_on_APFC_and_Fuzzy_PID_Algorithm