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2021 IEEE Transportation Electrification Conference & Expo (ITEC)最新文献

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Efficiency Evaluation of 2L and 3L SiC-Based Traction Inverters for 400V and 800V Electric Vehicle Powertrains 2L和3L硅基牵引逆变器在400V和800V电动汽车动力系统中的效率评价
Pub Date : 2021-06-21 DOI: 10.1109/ITEC51675.2021.9490082
Wesam Taha, B. Nahid-Mobarakeh, J. Bauman
This paper presents an efficiency evaluation of three silicon carbide (SiC) inverter topologies: two-level (2L) voltage source inverter (VSI), 3L neutral-point clamped (NPC), and 3L T-type inverter. Their efficiency is evaluated for powertrains rated at 400 V and 800 V, and using SiC MOSFET devices rated at 650 V and 1200 V operating at a switching frequency of 30 kHz. Firstly, the efficiency is evaluated at different operating load currents, on a per-unit scale. Secondly, the efficiency curves are mapped into torque-speed 2D maps of 120 kW interior permanent magnet (IPM) motors. Thirdly, the resulting efficiency maps are employed in an electric vehicle (EV) model, in order to study the performance of the three inverters on standard drive cycles. At the vehicle level, the energy consumption of the vehicle using the studied inverters is analyzed. It is found that 3L SiC-based inverters are most competitive in the 800 V powertrain. When compared to VSI, NPC and T-type offer 0.6% and 1.2% energy consumption savings. In 400 V, only T-type enjoys 0.9% energy savings over VSI.
本文介绍了三种碳化硅(SiC)逆变器拓扑的效率评估:两电平(2L)电压源逆变器(VSI), 3L中性点箝位(NPC)和3L t型逆变器。它们的效率是在额定电压为400 V和800 V的动力系统,以及使用额定电压为650 V和1200 V的SiC MOSFET器件在30 kHz的开关频率下工作时进行评估的。首先,效率评估在不同的工作负载电流,在每单位规模。其次,将效率曲线映射为120kw内嵌式永磁(IPM)电机的转矩-转速二维图。第三,将所得效率图应用于电动汽车模型,研究三种逆变器在标准驱动循环下的性能。在整车层面,分析了所研究逆变器的整车能耗。研究发现,3L硅基逆变器在800v动力系统中最具竞争力。与VSI相比,NPC和t型分别节省0.6%和1.2%的能耗。在400v时,只有t型比VSI节能0.9%。
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引用次数: 10
Comparative Analysis of Two Rotor Topologies for a High-Power Density Dual Three-Phase IPM Propulsion Motor 大功率密度双三相IPM推进电机两种转子拓扑结构的比较分析
Pub Date : 2021-06-21 DOI: 10.1109/ITEC51675.2021.9490049
A. Abdelrahman, Yawei Wang, D. Al-Ani, B. Bilgin
In order to simultaneously address the packaging and cost constraints stipulated by the U.S. Department of Energy for future electric vehicles, the necessity for high-power density interior permanent magnet motors (IPMs) has become more significant. Hence, maximizing the ratio of torque per permanent magnet mass (Tmax/Gm) of IPMs is considered an essential optimization target. In this paper, two different rotor structures, delta-shape, and double V-shape, for a dual three-phase traction motor design are comparatively investigated in terms of their electromagnetic performance. The two topologies are comprehensively evaluated for torque, torque ripple, demagnetization, and efficiency. The adopted design approach aims to bring a significant PM mass reduction along with achieving maximum torque yielding a cost-effective solution. The results show that the delta-shape configuration is a better candidate for the selected application in terms of the electromagnetic performance and PM material mass. However, the double V-shape is performing better with demagnetization and in the flux weakening region.
为了同时解决美国能源部对未来电动汽车的包装和成本限制,高功率密度内部永磁电机(ipm)的必要性变得更加重要。因此,最大限度地提高永磁转子的转矩/质量比(Tmax/Gm)被认为是一个重要的优化目标。本文对双三相牵引电动机的两种不同转子结构——三角型和双v型进行了电磁性能比较研究。对这两种拓扑进行了转矩、转矩脉动、消磁和效率的综合评估。所采用的设计方法旨在显著减少PM质量,同时实现最大扭矩,从而实现经济高效的解决方案。结果表明,从电磁性能和PM材料质量两方面考虑,delta形结构更适合所选应用。双v型在退磁和磁通减弱区表现较好。
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引用次数: 3
Fatigue Life Calculation and Mitigation of Bridge Stresses in the Rotor Core of a Delta-Shape Interior Permanent Magnet Motor 三角型内嵌式永磁电机转子铁芯疲劳寿命计算及桥梁应力缓解
Pub Date : 2021-06-21 DOI: 10.1109/ITEC51675.2021.9490186
A. Sahu, A. Abdelrahman, D. Al-Ani, B. Bilgin
Air flux barriers and bridges are critical rotor topology structures for better electromagnetic performance in permanent magnet machines. Rotor parts in these machines experience high and fluctuating stresses, which may lead to fatigue failure of these metal bridges. Further, the heat generated due to core losses results in thermal stresses, which append to the stresses due to centrifugal force. This paper presents a design strategy to evaluate the fatigue life of the rotor structure considering thermal and mechanical loads from a drive cycle. Moreover, the rotor topology is optimized to meet the stress limits without compromising the electromagnetic targets.
在永磁电机中,气磁屏障和气磁桥是提高转子电磁性能的关键拓扑结构。在这些机器转子部分经历高和波动应力,这可能导致这些金属桥梁的疲劳失效。此外,由于堆芯损耗而产生的热量会产生热应力,而热应力又会附加到离心力所产生的应力上。本文提出了一种考虑驱动循环热载荷和机械载荷的转子结构疲劳寿命评估设计策略。此外,在不影响电磁目标的情况下,对转子拓扑结构进行了优化,以满足应力限制。
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引用次数: 1
Cybersecurity for Electric Vehicle Fast-Charging Infrastructure 电动汽车快速充电基础设施的网络安全
Pub Date : 2021-06-21 DOI: 10.1109/ITEC51675.2021.9490069
Anuj Sanghvi, T. Markel
The integration of electric vehicles (EVs) into electric grid operations can potentially leave the grid vulnerable to cyberattacks from both legacy and new equipment and protocols, including extreme fast-charging infrastructure. This paper introduces a co-simulation platform to perform cyber vulnerability analysis of EV charging infrastructure and its dependencies on communications and control systems. Grid impact scenarios through linkages to power system simulation tools such as OpenDSS and vehicle infrastructure-specific attack paths are discussed. An adaptive platform that assists with predicting and solving evolving cybersecurity challenges is demonstrated with a cyber-energy emulation that accelerates the analysis of cyberattacks and system behavior.
将电动汽车(ev)整合到电网运营中,可能会使电网容易受到来自传统设备和新设备及协议的网络攻击,包括极端快速充电基础设施。本文介绍了一个联合仿真平台,用于对电动汽车充电基础设施及其对通信和控制系统的依赖进行网络漏洞分析。通过与电力系统仿真工具(如OpenDSS)和车辆基础设施特定攻击路径的连接,讨论了电网影响场景。通过加速网络攻击和系统行为分析的网络能源仿真,展示了一个有助于预测和解决不断变化的网络安全挑战的自适应平台。
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引用次数: 11
Control of PV Array-WECS Based EV Charging Station with Seamless Grid Interface 基于无缝电网接口的光伏阵列- wecs电动汽车充电站控制
Pub Date : 2021-06-21 DOI: 10.1109/ITEC51675.2021.9490051
A. Verma, Bhim Singh
This paper presents the control and implementation of multifunctional electric vehicle charging station (EVCS) assisted by the wind energy conversion system (WECS) and the PV array, an energy storage battery and the grid. In an islanded mode (IM), the WECS and PV array are used to charge the vehicle and to supply the domestic equipment's connected to the EVCS in coordination with the storage battery. However, the excess power is sent back to the grid for power balance. This EVCS supports the AC as well as DC charging. To achieve the continuous charging, seamless mode transition logic is embedded into the charging station control. Apart from the regular operation of the charging, the EVCS participates in various ancillary services. The operation of EVCS and effectiveness of the control algorithm are validated through the simulation and the experimental results.
介绍了由风能转换系统(WECS)、光伏阵列、储能电池和电网辅助的多功能电动汽车充电站(EVCS)的控制与实现。在孤岛模式(IM)中,WECS和PV阵列用于为车辆充电,并为连接到EVCS的家用设备提供与蓄电池协调的电力。然而,多余的电力被送回电网进行电力平衡。该EVCS支持交流和直流充电。为了实现连续充电,在充电站控制中嵌入了无缝模式转换逻辑。除收费系统的日常运作外,车辆服务中心亦参与多项辅助服务。通过仿真和实验结果验证了EVCS的运行和控制算法的有效性。
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引用次数: 0
Hydrogen consumption minimization with optimal power allocation of multi-stack fuel cell system using particle swarm optimization 基于粒子群优化的多堆燃料电池系统功率分配与氢耗最小化
Pub Date : 2021-06-21 DOI: 10.1109/ITEC51675.2021.9490111
Noureddine Bouisalmane, Tianhong Wang, E. Breaz, S. Doubabi, D. Paire, Jorn Oubraham, Michael Levy, Fei Gao
Concerning the fuel cell electric vehicles, the multi-stack fuel cell system (MFCS) offers superior performance and reliability over single stack fuel cell system. In order to obtain the lowest hydrogen consumption, this paper proposes a power allocation strategy using the Particle Swarm Optimization (PSO) algorithm. The MFCS is composed of two 300 W fuel cell stacks and a 360 Wh battery. The simulation results have shown that the performance of the proposed strategy can achieve more satisfactory results in terms of minimizing hydrogen consumption and managing the battery state of charge, compared to the equidistributional method.
在燃料电池电动汽车中,多堆燃料电池系统比单堆燃料电池系统具有更高的性能和可靠性。为了获得最低的氢消耗,本文提出了一种基于粒子群优化算法的功率分配策略。MFCS由两个300w的燃料电池组和一个360wh的电池组成。仿真结果表明,与等分配方法相比,该策略在最小化氢消耗和管理电池充电状态方面取得了更满意的效果。
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引用次数: 5
On the Design of Coreless Permanent Magnet Machines for Electric Aircraft Propulsion 电动飞机推进用无芯永磁电机设计研究
Pub Date : 2021-06-21 DOI: 10.1109/ITEC51675.2021.9490162
D. Lawhorn, Peng Han, Donovin D. Lewis, Yaser Chulaee, D. Ionel
This paper presents design and prototyping studies for coreless and slotless permanent magnet (PM) machines, which have the potential for high power density and efficiency, and discusses their feasibility for electric aircraft propulsion. The emphasis is on axial flux permanent magnet (AFPM) machines with printed circuit board (PCB) stators that have advantages over their wired counterparts in terms of design flexibility, coil accuracy, manufacturing process reliability, and heat dissipation. Detailed electromagnetic finite element analysis models were developed and employed alongside analytical sizing equations to evaluate the performance of two dual-rotor single-stator coreless AFPM designs employing wave and spiral PCB winding patterns. Design considerations for a 10kW 2,600rpm rating similar to the NASA X-57 electric aircraft propulsor motors are included. A 26-pole prototype machine has been developed and experimental testing results are presented.
本文介绍了具有高功率密度和高效率潜力的无芯和无槽永磁(PM)电机的设计和原型研究,并讨论了其用于电动飞机推进的可行性。重点是具有印刷电路板(PCB)定子的轴向磁通永磁(AFPM)机器,它们在设计灵活性、线圈精度、制造过程可靠性和散热方面优于有线同类机器。建立了详细的电磁有限元分析模型,并将其与解析尺寸方程结合使用,以评估采用波浪和螺旋PCB缠绕模式的两种双转子单定子无芯AFPM设计的性能。包括10kW 2,600rpm额定功率的设计考虑,类似于NASA X-57电动飞机推进电机。研制了一台26杆样机,并给出了实验测试结果。
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引用次数: 12
Optimal Design of Bipolar Power Pad for Dynamic Inductive EV Charging System Application 用于电动汽车动态感应充电系统的双极电源垫优化设计
Pub Date : 2021-06-21 DOI: 10.1109/ITEC51675.2021.9490068
H. Jafari, Temitayo O. Olowu, Maryam Mahmoudi, A. Sarwat
This paper proposes a multi-objective design optimization of bipolar power pads (BPP) of dynamic inductive electric power transfer (IPT) with application in electric vehicles. Minimization of IPT's design cost, power loss, and maximization of the IPT system's tolerance against horizontal/vertical misalignment are considered as objective functions during optimization process. The proposed design variables of the proposed algorithm are the shield plate length and width, ferrite bar length and width, the overlapping length of the coils, the coil width and inner length of the coil. Power electronic limitations, maximum allowable electromagnetic field exposure, minimum efficiency (≤ 80%), and upper/lower limits of design parameters are considered as the constraints of this optimization problem. The time harmonic electromagnetic physics model of the BPP is analyzed using an FEMM software coupled with MATLAB. A Non-Dominated Genetic Algorithm (NSGA-II) is employed as the optimization method, in which, the electromagnetic magnetic measurements from the FEMM software is used to evaluate the fitness values of the proposed objectives. The proposed BPP design optimization is applied on a 10-kW IPT system as a case study. The optimization results produced 15 Pareto optimal solutions which allows the designer to select the best design parameters based on the objectives of highest priority. The experimental setup of the dynamic IPT system based on one of the Pareto solution parameters is constructed and illustrated with details.
提出了一种应用于电动汽车的动态感应电力传输(IPT)双极电源垫(BPP)多目标优化设计方法。在优化过程中,以IPT的设计成本最小、功率损失最小、IPT系统对水平/垂直偏差的容忍度最大为目标函数。提出的算法设计变量为屏蔽板的长度和宽度、铁氧体棒的长度和宽度、线圈的重叠长度、线圈的宽度和线圈的内长度。考虑电力电子限制、最大允许电磁场暴露、最小效率(≤80%)和设计参数的上下限作为优化问题的约束条件。利用FEMM软件和MATLAB软件对BPP的时谐电磁物理模型进行了分析。优化方法采用非支配遗传算法(non - dominant Genetic Algorithm, NSGA-II),利用FEMM软件的电磁测量值对目标的适应度值进行评估。并以10kw IPT系统为例进行了BPP优化设计。优化结果产生了15个Pareto最优解,允许设计师根据最高优先级的目标选择最佳设计参数。建立了基于其中一个帕累托解参数的动态IPT系统的实验装置,并进行了详细说明。
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引用次数: 0
Analysis of PEV User Charging Behavior at Household Charging Stations, Omaha Case Study 家庭充电站PEV用户充电行为分析,以奥马哈市为例
Pub Date : 2021-06-21 DOI: 10.1109/ITEC51675.2021.9490079
Ahmad Almaghrebi, Xiaoyue Cheng, K. James, M. Alahmad
While the increase in EV use is a positive step towards embracing green technology, the heightened energy demands resulting from this rapid growth present major challenges to local energy grid load management. For context, the new EVs being deployed store approximately 100 kWh, about four times the daily electricity use of the average household in the U.S. Current local distribution grids do not have the capacity to accommodate these massively increased loads. For this reason, it is important that local utilities have a full understanding of the charging demand within a given grid. The main objective of this research is to deepen the understanding of charging behavior at the household level using real data. Specifically, data from existing 417 residential Level-2 charging stations, located in Omaha, Nebraska, USA, are collected and analyzed. The results show a clear pattern in user behavior for the starting time of sessions, as well as the connection duration, charging duration, and subsequent energy demand.
虽然电动汽车使用量的增加是拥抱绿色技术的积极一步,但这种快速增长导致的能源需求增加给当地电网负荷管理带来了重大挑战。作为背景,新部署的电动汽车大约存储100千瓦时的电量,大约是美国普通家庭每日用电量的四倍,目前的当地配电网没有能力容纳这些大量增加的负荷。因此,当地公用事业公司充分了解给定电网内的充电需求是很重要的。本研究的主要目的是利用真实数据加深对家庭层面收费行为的理解。具体而言,收集和分析了位于美国内布拉斯加州奥马哈市现有的417个住宅二级充电站的数据。结果显示了会话开始时间、连接持续时间、充电持续时间和随后的能源需求等用户行为的清晰模式。
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引用次数: 2
Comparative Analysis of 2-Level and 3-Level Voltage Source Inverters in Traction Applications 牵引用2电平和3电平电压源逆变器的比较分析
Pub Date : 2021-06-21 DOI: 10.1109/ITEC51675.2021.9490160
Yicheng Wang, A. Poorfakhraei, Narimani Mehdi, A. Emadi
This paper presents a comprehensive analysis and comparison between the 2-level voltage source inverter, 3-level neutral point clamped, and 3-level active neutral point clamped inverters in traction inverters. In this comparison Silicon Carbide MOSFET, Gallium Nitride MOSFET and Silicon IGBT are employed. An analytical method for calculating the inverter power loss is also presented in this paper. Simulation results are conducted using MATLAB/Simulink and PLECS at different operating conditions. A permanent magnet synchronous motor is used as the load. The analysis and comparison have been conducted at different operating points regarding the speed and torque. The performance of each inverter topology is also investigated at different switching frequencies for these operating conditions. Moreover, two drive cycle analyses are also studied and included in this paper.
本文对牵引逆变器中的2级电压源逆变器、3级中性点箝位逆变器和3级有源中性点箝位逆变器进行了全面的分析和比较。在这个比较中使用了碳化硅MOSFET、氮化镓MOSFET和硅IGBT。本文还提出了一种计算逆变器功率损耗的解析方法。利用MATLAB/Simulink和PLECS对不同工况下的仿真结果进行了分析。采用永磁同步电机作为负载。对不同工况下的转速和转矩进行了分析和比较。研究了不同开关频率下各逆变器拓扑结构的性能。此外,本文还研究了两种驱动循环分析方法。
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引用次数: 6
期刊
2021 IEEE Transportation Electrification Conference & Expo (ITEC)
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