减小直流电容的集成车载充电器输入电能质量控制

Muhammad Zarkab, Bhim Singh, B. K. Panigrahi
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引用次数: 2

摘要

集成的车载充电器使用电机驱动器及其电压源转换器在车辆不运行时为电池充电。该充电器在交直流转换阶段,在直流和分路直流电容电压下都有产生低频电压纹波的固有倾向。因此,采用体积庞大的高值电解电容器来吸收这些低频电容波纹。用低值薄膜电容器代替这些电解电容器,会导致输入电能质量差。因此,本文提出了一种基于改进单元模板控制的控制策略,在不使用任何额外的有源/无源元件的情况下,降低直流链路电容值,以达到改善输入电能质量的目的。在改进单元模板控制中,将电网电流的谐波信息馈送到单元模板中,实现了统一功率因数运行,降低了电网电流的THD。此外,为了降低双频分量对电动汽车电流/电压的影响,在DC-DC级采用了直流环节前馈控制。最后,通过仿真和实验结果验证了本文提出的解决方案的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Input Power Quality Control of Integrated On-Board Charger with Reduced DC-link Capacitance
An integrated on-board charger uses the motor drive and its voltage source converter for battery charging when the vehicle is not running. This charger in AC-DC conversion stage has an inherent tendency to produce low frequency voltage ripple in both DC-link and split DC-link capacitor voltages. Therefore, bulky high valued electrolytic capacitors are adopted to absorb these low frequency capacitor ripples. Replacing these electrolytic capacitors with low valued film capacitors, results in poor input power quality. Therefore, this paper presents a control strategy based on modified unit-template control with reduced DC-link capacitance value to achieve improved input power quality without using any additional active/passive components. In modified unit-template control, the harmonics information of the grid current is feed-forwarded into the unit template to achieve unity power factor operation and reduced grid current THD. Furthermore, to reduce the influence of double frequency component on EV current/voltage, a DC-link feedforward control is implemented in DC-DC stage. Finally, the effectiveness of the solution presented in this paper, is verified by simulation and experimental results.
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