一种虚拟电阻并联电容有源阻尼法  

An Active Damping Method of Virtual Resistor in Parallel With Capacitor

作　　者：伍小杰[1] 孙蔚[1,2] 戴鹏[1] 周娟[1] 

机构地区：[1]中国矿业大学信电学院,徐州221008 [2]中国电力科学研究院新能源所,北京100192

出　　处：《电工技术学报》2010年第10期122-128,共7页Transactions of China Electrotechnical Society

摘　　要：传统的PWM整流器每相通过一个L滤波器接入电网,L滤波器用来滤除开关频率谐波。然而,若用LCL滤波器代替L滤波器接入电网可以利用较小的电容电感值,达到较好的滤波效果。但是LCL滤波器在高频下会产生谐振,影响系统的稳定性。基于虚拟电阻的概念,本文采用一种新的电容并联电阻的虚拟电阻有源阻尼法并分析了该方法的阻尼原理,推算了其功率损耗函数和纹波衰减函数,首次提出通过纹波衰减函数的博德图分析阻尼方法的有效性,仿真和实验结果证明了该方法的可行性。The rectifier connected to supply network with an LCL filter is more effective and reduce harmonic distortion at lower switch frequency than an L filter.However an LCL filter will bring stability problem.This paper shows the present damping methods include passive damping with a resistor and active damping algorithm and gives the advantages and disadvantages of these methods.Then the paper shows a new passive damping with a resistor parallel to the filter capacitance and prove it＇s validity through ripple current attenuation function for the first time.Then based on virtual resistor concept,this paper gives a new active damping method.Simulation results are provided to prove the validity of this method.

关 键 词：PWM整流器 LCL滤波器 无源阻尼 有源阻尼 虚拟电阻 纹波衰减函数 

分 类 号：TM461[电气工程—电器]