Analysis and Evaluation of DC-Link Capacitors for High-Power-Density Electric Vehicle Drive Systems
Analysis and Evaluation of DC-Link Capacitors for High-Power-Density Electric Vehicle Drive Systems
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DOI：
10.1109/tvt.2012.2206082
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发表时间：
2012-06
影响因子：
6.8
通讯作者：
H. Wen;W. Xiao;X. Wen;P. Armstrong
中科院分区：
文献类型：
--
作者：
H. Wen;W. Xiao;X. Wen;P. Armstrong
在电动汽车（EV）逆变器系统中，直流母线电容器体积大、重量重，且易因自发热而性能下降，这可能成为高功率密度的关键障碍。本文提出了一种综合方法，用于对直流母线电容器的应用进行分析和比较评估，以最小化其体积、质量和电容。推导了在一定频率和工作温度范围内有效的等效串联电阻模型，并通过实验进行了验证。针对电动汽车驱动系统中负载功率因数和调制指数的实际范围，就三种调制策略和各种运行条件，对电容器电流的均方根值和频谱进行了分析。建模和分析还考虑了直流母线电容器的自发热过程以及由此产生的核心温度，这对其使用寿命有影响。基于一个80千瓦的永磁（PM）电机驱动系统，通过仿真和实验测试对电解电容器和薄膜电容器的应用进行了评估。在不牺牲功率损耗、核心温度和使用寿命等系统性能的情况下，逆变器功率密度从2.99千瓦/升提高到了13.3千瓦/升。
In electric vehicle (EV) inverter systems, direct-current-link capacitors, which are bulky, heavy, and susceptible to degradation from self heating, can become a critical obstacle to high power density. This paper presents a comprehensive method for the analysis and comparative evaluation of dc-link capacitor applications to minimize the volume, mass, and capacitance. Models of equivalent series resistance that are valid over a range of frequency and operating temperature are derived and experimentally validated. The root-mean-square values and frequency spectra of the capacitor current are analyzed with respect to three modulation strategies and various operating conditions over practical ranges of load power factor and modulation index in EV drive systems. The modeling and analysis also consider the self-heating process and resulting core temperature of the dc-link capacitors, which impacts their lifetimes. Based on an 80-kW permanent-magnet (PM) motor drive system, the application of electrolytic capacitors and film capacitors has been evaluated by both simulation and experimental tests. The inverter power density is improved from 2.99 kW/L to 13.3 kW/L, without sacrificing the system performance in terms of power loss, core temperature, and lifetime.