磁集成LCL倍压单元高增益变换器 *

doi:10.11985/2019.01.010

摘要/Abstract

摘要：

针对光伏等新能源并网发电的需求,提出了一种基于LCL倍压单元的磁集成交错并联高增益直流变换器。通过如下方式改进传统交错并联Boost变换器：采用LCL倍压单元代替储能电感提高电压增益;在传统变换器输出端加入三电平电容降低开关管电压应力;将变换器中的电感进行磁集成减小变换器的体积,改善了变换器的输入输出纹波及动态性能,同时提高了变换器功率密度和转换效率。给出了变换器主要工作波形以及各模态等效电路图,推导了变换器电压增益、变换器等效稳态电感和暂态等效电感表达式,并给出了变换器磁件耦合度设计准则,通过仿真和实验验证了理论分析的正确性。

关键词: 直流变换器, LCL倍压单元, 磁集成, 高增益, 电流纹波

Abstract:

Aiming at the demand of grid-connected power generation of new energy such as photovoltaic, a magnetic integrated staggered parallel high-gain DC converter is proposed based on LCL double pressure unit. The traditional staggered parallel Boost converter is improved by replacing the energy storage inductance with LCL double pressure unit to increase the voltage gain, adding the three-level capacitance to reduce the voltage stress of the switch tube at the output end of the traditional converter, and reducing the magnetic integration of the inductor in the converter to reduce the volume of the converter. The input and output lines of the converter are improved as well as the dynamic performance, and the power density and conversion efficiency of the converter are improved. The main working waveforms of the converter and the equivalent circuit diagram of each mode are given. The voltage gain of the converter, the equivalent steady-state inductance of the converter and the transient equivalent inductance expression are deduced. At the same time, the design criterion of the coupling degree of the converter magnetic parts is given. It is verified that the correctness of the theory through simulation and experiment.

Key words: DC converter, LCL voltage doubler unit, magnetic integration, high gain, current ripple

中图分类号:

TM46

李洪珠,史清晨,刘艳,李洪璠. 磁集成LCL倍压单元高增益变换器 ^*[J]. 电气工程学报, 2019, 14(1): 52-60.

LI Hongzhu,SHI Qingchen,LIU Yan,LI Hongfan. Magnetic Integrated Staggered Parallel High Gain Converter with LCL Voltage Doubling Unit[J]. Journal of Electrical Engineering, 2019, 14(1): 52-60.

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变量	传统Boost变换器	改进型交错并联 Boost变换器
电压增益	$\frac{1}{1-D}$	$\frac{4}{1-D}$
开关管电压应力	${{U}_{\text{o}}}$	$\frac{{{U}_{\text{o}}}}{2}$
电流纹波	$\frac{{{U}_{i\text{n}}}DT}{L}$	$\frac{{{U}_{\text{in}}}DT}{{{L}_{\text{ss}}}}$

参数	数值/μH	参数	数值/μH
L₁	10.62	L₂	10.58
L₃	10.70	L₄	10.55
M₁₂	10.16	M₃₄	10.19
M₁₃	6.68	M₁₄	6.64
M₂₃	6.76	M₂₄	6.57