摘要
谐波消除式PWM方法 (SHEPWM) ,可在较低开关频率下 ,产生不含特定次数谐波的电压波形 ,从而减小了电流和转矩波动。因其开关次数少 ,效率高 ,多在高压大功率设备上采用。但是在线计算比较困难。本文在谐波消除原理的基础上 ,提出了开关频率较低的谐波消除式逆变器离线计算和在线实现的方法 ;提出了基波电压有效值比值最大下直流母线电压的计算方法。
Selected Harmonic Elimination PWM Inverter(SH EPWM)produces lower switching frequency,smaller vibration of torque and current,and higher efficiency.However,SHEPWM inverter side switching angle online calculating is so difficult that its farther application is limited.This paper proposes a realization way for switching interval's offline calculation and online carrying out.And SHEPWM Inverter's DC voltage for maximum RMS value ratio of fundamental wave is discussed as well
出处
《电气应用》
北大核心
2005年第3期99-102,共4页
Electrotechnical Application
