滤波参数对逆变器输出波形的影响研究  

Research on impact of filter parameter on output waveform of inverter

作　　者：汪志成[1] 李紫微 陈经纬 嵇志腾 WANG Zhicheng;LI Ziwei;CHEN Jingwei;JI Zhiteng(School of Mechanical and Electronic Engineering,East China University of Technology,Nanchang 330013,China;Quanzhou Weidun Electric Co.,Ltd.,Quanzhou 362012,China)

机构地区：[1]东华理工大学机械与电子工程学院,江西南昌330013 [2]泉州维盾电气有限公司,福建泉州362012

出　　处：《现代电子技术》2025年第4期10-17,共8页Modern Electronics Technique

基　　金：江西省技术创新引导类项目(科技合作专项)(20212BDH80008);东华理工大学江西省新能源工艺与装备工程技术研究中心开放基金(JXNE 2018-04);抚州市揭榜挂帅重大项目:变配电设备健康状态在线诊断及智能云平台;江西省揭榜挂帅项目:梯次储能关键技术研究及应用示范(20233AAE02008)。

摘　　要：为了探究滤波电感、电容、滤波器结构及磁芯材料对逆变器输出波形的影响,文中设计一种LLC型滤波结构。在双极性驱动方式下,LLC型滤波电感、电容参数增大,逆变器输出波形对称性更好。但随着参数持续增大,该滤波结构会引起输出波形起始波动时间延长,波动程度增大,电路阻抗、无功功率增加及波形过矫正。对LC型、LLC型、LCL型三种滤波结构的对比研究结果表明:在电感、电容参数为3 mH和14.1μF时,三种结构都具备较好的滤波特性;LLC型滤波结构具备更好的线路阻抗平衡特性,输出波形对称性更好。研究了铁硅铝、锰锌铁氧体以及非晶纳米晶三种磁芯材料对LLC型滤波特性的影响,发现在参数相同时,磁导率越高波形对称性越差,阻抗变大会导致逆变输出波形畸变。因此,在逆变器滤波设计中应综合考虑电感、电容、磁导率及线路阻抗平衡问题,以提高滤波器的工作性能。A LLC type filter structure is designed to investigate the impact of filter inductance,capacitor,structure,and magnetic core material on the output waveform of the inverter.Under bipolar driving mode,the LLC type filter inductor and capacitor parameters can increase,resulting in better symmetry of the inverter output waveform.As the parameters continue to increase,this filtering structure will cause the initial fluctuation time of the output waveform to prolong,the fluctuation degree to increase,the circuit impedance and reactive power to increase,and the waveform to be over-corrected.The comparative study of LC,LLC and LCL filter structures shows that when the inductance and capacitance parameters are 3 mH and 14.1μF,the three structures have better filtering characteristics,while the LLC filter structure has better line impedance balance characteristics and better output waveform symmetry.The influence of three core materials,Fe-Si-Al,Mn-Zn-Ferrite and amorphous nanocrystalline on the characteristics of LLC filter is studied.It is found that when the parameters are the same,the higher the permeability,the worse the wave symmetry.The impedance amplification can lead to the waveform distortion of inverter output.Therefore,comprehensive consideration should be given to inductance,capacitance,permeability and line impedance balance when designing an inverter filter to enhance its performance.

关 键 词：LLC谐振 滤波电感 滤波电容 滤波结构 逆变器 线路阻抗 磁导率 

分 类 号：TN713-34[电子电信—电路与系统] TM464[电气工程—电器]