一种带开关回馈电容变频器的仿真研究  

Simulation research on a switched feedback capacitor inverter

作　　者：段明亮[1] 荣为青 孟彦京[1] 

机构地区：[1]陕西科技大学电气与信息工程学院,陕西西安710021

出　　处：《电子技术应用》2017年第12期133-136,142,共5页Application of Electronic Technique

基　　金：国家自然科学基金(51577110)

摘　　要：针对变频器带电机负载时回馈能量的吸收,设计了一种在直流母线两端增加一个串联有反并联二极管的功率开关管的电容支路拓扑结构的变频器。分析了此种结构的工作原理以及在三相正弦电源供电下电机稳定运行时回馈能量的大小与转差率的关系。相同容值下,相较于普通变频器直流母线直接并联电容,开关电容可以更好地吸收回馈的能量,消除母线的泵升电压使母线电压更稳定,进而使变频器具有更好的输出性能。通过MATLAB仿真,验证了系统的可行性,同时在刚好完全吸收回馈能量的前提下,开关回馈电容变频器母线并联电容容值可减小为普通变频器的60.53%。Aiming at the question that the energy absorption of the feedback energy when the frequency converter is with the electrical machinery load, a frequency converter with a capacitance branch topology of a power switch in series with an anti-parallel diode is designed at both ends of the DC bus. Analysis of the working principle of the structure and the relationship between the stable operation of motor energy feedback in three-phase power sinusoidal power supply with the size of the slip. Under the same capacitance value, compared with the common inverter bus, the shunt capacitor can be used to better absorb the feedback energy,eliminate the pump voltage of the bus, and make the bus voltage more stable. Through the MATLAB simulation, the feasibility of the system is verified. At the same time, under the condition that the energy is absorbed completely, the capacitance value of the shunt capacitor can be reduced to 60. 53 % of the parallel capacitance of the general inverter.

关 键 词：变频器 开关电容 能量回馈 

分 类 号：TM7[电气工程—电力系统及自动化]