三电平PWM并网变换器LCL滤波器量化设计  

Quantitative design of LCL filter of three-level PWM grid-connected converter

作　　者：戴鹏[1] 石祥龙[1] 岳悦[1] 袁庆庆[2] 

机构地区：[1]中国矿业大学信息与电气工程学院,江苏徐州221008 [2]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《电测与仪表》2016年第5期113-117,128,共6页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(51377160);江苏省普通高校研究生科研创新计划项目(SJLX-0631)

摘　　要：随着并网变换器容量的增大,LCL滤波器的优势更加明显。在满足相同滤波效果的情况下,LCL滤波器所需电感值比L滤波器要小。以谐波电流衰减比作为优化目标,参数设计会大于实际要求,增加滤波器的体积与成本。通过基于二重傅里叶级数的三电平变换器脉宽电压谐波分析结果,提出一种三电平PWM并网变换器LCL滤波器的设计方法,实现滤波性能的量化。该设计方法不是以降低网侧电流谐波含量为目标,而是在THD满足要求的情况下尽可能的降低LCL滤波器的规格,降低成本,并对设计的LCL滤波器进行了仿真和实验,验证了所提方法的有效性。The advantages of the LCL filter are presented with the increase of the capacitance of the grid-connected converter. LCL filter needs smaller inductance value comparing with L filter at the same performance in harmonic suppression. With the input and output harmonic current attenuation ratio as the optimization target,the designed parameters may larger than the actual demand. It would lead to the increase of size and cost. This paper analyzes pulse width voltage harmonics at the side of three-level grid-connected converter based on double Fourier series,a quantitative design method of LCL filter of three-level PWM grid-connected converter is proposed,which achieves specific quantization of the filter performance. This method is not designed to reduce the harmonic content of the grid current,but to meet the total harmonic distortion（ THD） requirements as much as possible to reduce the LCL filter specifications and cost. Finally,simulation and experimental results verify the effectiveness of the proposed method.

关 键 词：LCL滤波器 二重傅里叶 三电平变换器 谐波分析 谐波畸变率 

分 类 号：TM46[电气工程—电器]