一种基于开关电容倍压单元的新型浮地并联高增益变换器*

doi:10.11985/2021.02.023

摘要/Abstract

摘要：

针对传统Boost变换器电压增益低、开关器件电压应力大不适用于燃料电池/光伏发电系统的问题,提出一种新型非隔离高增益DC/DC变换器。该拓扑采用浮地并联结构,主电路上下对称,并结合开关电容单元有效提高了变换器的电压增益;此外变换器还具有开关器件低电压应力、低电流应力、电感电流自动均流的优点,多电感并联的结构则有利于提升变换器的功率等级。详细分析了所提变换器的工作原理与稳态特性,并设计了相应的高阶滑模控制策略以提高变换器的鲁棒性。最后,通过仿真与试验验证了理论分析的正确性。

关键词: 光伏/燃料电池, 高增益, 开关电容, 电压应力

Abstract:

A novel non-isolated high-gain DC/DC converter is proposed to solve the problems of low voltage gain and high voltage stress of traditional Boost converter in fuel cell/PV power generation system. In this topology, the main circuit of floating parallel structure is symmetrical and combined with switched capacitor units, which improves the voltage gain of the converter effectively. In addition, the converter has the advantages of low voltage stress and low current stress on switches and diodes, automatic current sharing of inductors, and the structure of multiple inductors in parallel is beneficial to improve the power level of the converter. The operating principle and steady-state characteristics of the proposed converter are analyzed in detail, and the corresponding high-order sliding mode control strategy is designed to improve the robustness of the converter. Finally, the validity of the theoretical analysis is verified by simulation and experiments.

Key words: Fuel cell/PV, high voltage gain, switched capacitor, voltage stress

中图分类号:

TM46

马雨辉, 皇甫宜耿, 徐良材, 许佳妮. 一种基于开关电容倍压单元的新型浮地并联高增益变换器^*[J]. 电气工程学报, 2021, 16(2): 181-189.

MA Yuhui, HUANGFU Yigeng, XU Liangcai, XU Jiani. A Novel Floating Parallel High-gain Converter Based on Switched Capacitor Voltage Doubler[J]. Journal of Electrical Engineering, 2021, 16(2): 181-189.

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拓扑	电压增益	开关管电压应力	二极管电压应力
传统Boost	$\frac{1}{1-D}$	${{\text{V}}_{\text{o}}}$	${{\text{V}}_{\text{o}}}$
FIBC^[18]	$\frac{1\text{+}D}{1-D}$	$\frac{{{\text{V}}_{\text{o}}}}{1\text{+D}}$	$\frac{{{\text{V}}_{\text{o}}}}{1\text{+D}}$
HGBC^[19]	$\frac{1\text{+}{{D}_{1}}}{1-{{D}_{1}}-{{D}_{2}}}$	$\frac{{{V}_{\text{o}}}\text{+}{{V}_{\text{in}}}}{2}$/${{\text{V}}_{\text{o}}}$	${{V}_{\text{o}}}\text{+}{{V}_{\text{in}}}$/${{V}_{\text{in}}}$
ASL-SU2C^[20]	$\frac{1\text{+}3\text{D}}{1-D}$	$\frac{{{\text{V}}_{\text{o}}}}{1\text{+}3\text{D}}$	$\frac{2{{\text{V}}_{\text{o}}}}{1\text{+}3\text{D}}$
所提变换器	$\frac{3\text{+}D}{1-D}$	$\frac{{{\text{V}}_{\text{o}}}}{3\text{+D}}$	$\frac{{{\text{V}}_{\text{o}}}}{3\text{+D}}$/$\frac{2{{\text{V}}_{\text{o}}}}{3\text{+D}}$

物理量	数值	物理量	数值
输入电压/V	20~25	输出电容${{\text{C}}_{\text{o}}}$/μF	470
额定输出电压/V	180	开关电容${{\text{C}}_{\text{b}1}}、 {{\text{C}}_{\text{b}2}}$/μF	68
开关频率/kHz	50	内环控制器参数	$\lambda \text{=}0.06, \alpha \text{=}150$
电感/μH	330	外环控制器参数	${{\lambda }_{0}}\text{=}0.8, {{\alpha }_{0}}\text{=}500$