文章摘要
贾益行,吴红飞,韩蒙,等.准单级功率变换的高效单相三端口PFC变换器[J].电力系统自动化. DOI: 10.7500/AEPS20170730003.
Jia Yihang,Wu Hongfei,Han Meng, et al.Quasi Single-Stage High Efficiency Single-Phase Three-Port PFC Converter[J].Automation of Electric Power Systems. DOI: 10.7500/AEPS20170730003.
准单级功率变换的高效单相三端口PFC变换器
Quasi Single-Stage High Efficiency Single-Phase Three-Port PFC Converter
DOI:10.7500/AEPS20170730003
关键词: 有源功率因数校正  准单级;三端口变换器;瞬时效率
KeyWords: active power factor correction  quasi single stage  three-port converter  instantaneous efficiency
上网日期:2018-08-07
基金项目:国家自然科学基金;江苏省“六大人才高峰”项目;江苏省青蓝工程
作者单位E-mail
贾益行 南京航空航天大学 jyh@nuaa.edu.cn 
吴红飞 南京航空航天大学 wuhongfei@nuaa.edu.cn 
韩蒙 南京航空航天大学 hanmeng@nuaa.edu.cn 
邢岩 南京航空航天大学 xingyan@nuaa.edu.cn 
摘要:
      Boost型功率因数校正(PFC)变换器输出电压必须高于交流电压峰值,负载电压较低时需要级联DC-DC变换器,两级功率变换不利于系统效率提高。以优化PFC变换器随电网电压变化的瞬时效率、进而提升整体效率为目标,研究了一种单相三端口PFC变换器,通过将传统三电平Boost变换器的低压侧分压电容直接用作负载输出端口,并构造出一个高压端口,可以实现交流输入侧和直流负载侧之间的准单级功率变换,有效减小了系统中功率变换的级数,从而实现PFC变换器整体效率的提升。此外,准单级功率变换的特性还有利于减小后级直流变换器的电压电流应力和功率损耗,进一步提高AC-DC变换器的整体效率。详细分析了三端口PFC变换器的工作原理和控制策略,建立了损耗分析模型并进行了仿真验证。最后,利用2kW实验样机验证了所研究变换器在改善系统效率方面的有效性。
Abstract:
      The output voltage of Boost PFC converter must be higher than the peak AC voltage, a cascaded DC-DC converter is needed when the load voltage is low, two-stage power conversion is not conducive to the improving of system efficiency. A single-phase three-port PFC converter is studied in order to optimize the instantaneous efficiency of the PFC converter within the grid voltage period and further improve the overall efficiency. Quasi-single-stage power conversion between the AC input side and the DC load side is realized by directly using the low-voltage side capacitor of the traditional three-level Boost converter as load port and constructing a high-voltage port, which also effectively reduces the power conversion stages in the system and thus improving the overall efficiency. In addition, the characteristic of quasi-single-stage power conversion is also conducive to reducing the voltage, current stress and power loss of the rear DC-DC converter, which further improves the overall efficiency of AC-DC converter. The working principle and control strategy of the three-port PFC converter are analyzed in detail, the loss analysis model is established and verified by simulation. Finally, a 2kW experimental prototype is used to verify the effectiveness of the proposed converter in improving system efficiency.
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