摘要
AC-DC变换器需加入有源功率因数校正(power factor correction,PFC)电路来减少网侧电流谐波。传统Boost型PFC电路因其升压特性而无法使输出电压宽范围变化。该文采用一种升降压型无桥PFC变换器,通过切换升压通路和降压通路实现电压宽范围输出。为进一步减少网侧电流谐波,采用变载波调制,通过改变升压载波和降压载波的分配比例使其随输出电压变化而变化,相比于定载波调制降低网侧电流总谐波失真值。针对单相PFC电路存在二倍频功率需在输出端并联大电解电容的问题,文章利用双向Buck-Boost电路进行功率解耦以吸收二倍频功率。最后,介绍升降压型无桥PFC变换器的工作原理和控制策略,实验结果验证了升降压型无桥PFC变换器及其控制方式的正确性和有效性。
The active power factor correction(PFC)circuits are required for AC-DC converters to reduce the harmonics of the grid-side current.Traditional Boost PFC circuits cannot achieve a wide range of output voltage changes due to its inherent Boost characteristics.In this paper,a Buck/Boost bridgeless PFC converter is proposed to achieve a wider range of output voltage by alternating the boost path and buck path.In order to further reduce the grid-side current harmonics,this paper adopts a variable-carrier modulation method which adjusts the distribution ratio of the boost carrier and the buck carrier,so that the carrier varies with the output voltage and the total harmonic distortion is further reduced compared with the fixed carrier modulation method.Since the input side of the traditional single-phase PFC circuit produces double-frequency power,a large electrolytic capacitor is needed to be connected in parallel at the output side,this paper uses the bidirectional Buck-Boost circuit for power decoupling to achieve absorbing the double-frequency power.This paper introduces in detail the working principle and control strategy of the used buck/boost bridgeless PFC converter,and verifies the correctness and effectiveness of the buck/boost bridgeless PFC converter and its control method through experiments.
作者
胡广
吴学智
续文政
荆龙
HU Guang;WU Xuezhi;XU Wenzheng;JING Long(National Active Distribution Network Technology Research Center(Beijing Jiaotong University),Haidian District,Beijing 100044,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2023年第9期3507-3514,共8页
Proceedings of the CSEE
基金
中央高校基本科研业务费专项资金资助项目(2021RC227)。
