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功率因数校正变换器[J].电力系统自动化,2018,42(18):136-141. DOI: 10.7500/AEPS20170730003.
JIA Yihang,WU Hongfei,HAN Meng, et al.High-efficiency Single-phase Three-port Converter for Power Factor Correction Based on Quasi Single-stage Power Conversion[J].Automation of Electric Power Systems,2018,42(18):136-141. DOI: 10.7500/AEPS20170730003.
准单级功率变换的高效单相三端口功率因数校正变换器
High-efficiency Single-phase Three-port Converter for Power Factor Correction Based on Quasi Single-stage Power Conversion
DOI:10.7500/AEPS20170730003
关键词: 有源功率因数校正  三端口变换器  瞬时效率  优化
KeyWords: active power factor correction  three-port converter  instantaneous efficiency  optimization
上网日期:2018-08-07
基金项目:国家自然科学基金资助项目(51677085);江苏省“六大人才高峰”项目(2016-XNYQC-008);江苏省青蓝工程资助项目
作者单位E-mail
贾益行 多电飞机电气系统工信部重点实验室(南京航空航天大学), 江苏省南京市 211106  
吴红飞 多电飞机电气系统工信部重点实验室(南京航空航天大学), 江苏省南京市 211106 wuhongfei@nuaa.edu.cn 
韩蒙 多电飞机电气系统工信部重点实验室(南京航空航天大学), 江苏省南京市 211106  
邢岩 多电飞机电气系统工信部重点实验室(南京航空航天大学), 江苏省南京市 211106  
摘要:
      由于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,因此当负载电压较低时,其需要级联直流/直流(DC/DC)变换器,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DC/DC变换器的电压电流应力和功率损耗,进一步提高交流/直流(AC/DC)变换器的整体效率。文中详细分析了三端口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2 kW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:
      Considering to that the output voltage of Boost power factor correction(PFC)converter must be higher than the peak AC voltage, a cascaded DC/DC converter is needed when the load voltage is low, and two-stage power conversion is not conducive to the improvement of system efficiency. A single-phase three-port PFC converter is studied 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 of the system and thus improves the overall efficiency. In addition, the characteristics of quasi single-stage power conversion are also conducive to reducing the voltage stress, 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, and the loss analysis model is established and verified by simulation. Finally, a 2 kW experimental prototype is used to verify the effectiveness of the proposed converter in system efficiency.
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