一种面向PWM逆变器的滤波器设计  

A filter design for pulse width modulation inverter

作　　者：李金钊 LI Jinzhao(School of Electrical&Electronic Engineering,Nanyang Technological University,Singapore 639798,Singapore)

机构地区：[1]新加坡南洋理工大学电子与电气工程学院,新加坡639798

出　　处：《电子设计工程》2024年第9期66-69,74,共5页Electronic Design Engineering

摘　　要：针对直流并网发电系统PWM逆变器输出电压携带高频谐波从而影响系统稳定性的问题,文中设计了一种面向脉冲宽度调制(PWM)逆变器、可优化谐振频率的滤波器。该滤波器结合了主流带有数字微控制器的直流发电系统原理,将滤波后输出的电压信号经过处理、采集、转换和反馈等步骤,完成对PWM逆变器的控制和驱动。在控制系统的应用中,单环反馈控制设计在滤波器的输出环节进行,根据控制方法选取相关参数。仿真实验结果显示,逆变器测电流总谐波畸变率TDH为5.63%,滤波器滤波后则为1.02%,谐波降低了4.61%,具有良好的滤波效果。Aiming at the problem that the output voltage of PWM inverter in DC grid-connected power generation system carries high-frequency harmonics,which affects the stability of the system,this paper designs a Pulse Width Modulation(PWM)inverter oriented filter that can optimize the resonant frequency.This filter combines the principle of mainstream DC power generation system with digital microcontroller,and completes the control and drive of PWM inverter by processing,collecting,converting and feedback the filtered output voltage signal.In the application of control system,single-loop feedback control is designed at the output link of the filter,and relevant parameters are selected according to the control method.The simulation results show that the total harmonic distortion rate TDH of the measured current of the inverter is 5.63%,and after filtering,it is 1.02%,and the harmonic is reduced by 4.61%,which has a good filtering effect.

关 键 词：直流发电机 脉冲宽度调制 并网逆变器 LCL滤波器 

分 类 号：TN713[电子电信—电路与系统]