摘要
本文提出了一种新型的三相四线制多电平逆变器,它在常规六开关三相全桥逆变输出上,再级联一级半桥,并加入自举电路,负载中线与输入电源正极相连.在纹波跟踪分段式SPWM(Sinusoidal Pulse Width Modulation)调制下,级联的半桥电能由自举电路工作时得到.该电路拓扑结构及其控制方法,减少了多电平逆变的独立直流电源数,提高了逆变输出电压.文章用逐段计算法分析了规则采样SPWM调制法的自举电容的纹波和电流,以及产生的谐波.通过分析和实验表明,自举电容的电容量、充电回路电阻、负载和调制度等,均对自举电容的纹波和电流有影响.
The paper proposes a newthree-phase four-wire multilevel inverter. Besides the conventional six-switch three-phase full-bridge inverter output,the inverter cascades to a half bridge configuration and has a bootstrap circuit with the load neutral line connecting to the anode of input power. Under the ripple-tracing segmental SPWM（ Sinusoidal Pulse Width M odulation）,the cascaded half-bridge electricity is obtained when the bootstrap circuit works. The circuit topology structure and its control method reduce the independent direct-current power sources of the multilevel inverter and raise the inverter output voltage. Using the piecewise calculation method,the paper analyzes the ripples and current of the bootstrap capacitor with regular sampling SPWM modulation,and the harmonic waves generated. The analyses and experiments in this paper showthat a bootstrap capacitor＇s capacitance,charging loop resistance,load and modulation degree can affect the capacitor＇s ripples and current.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2015年第6期1205-1210,共6页
Acta Electronica Sinica
基金
2013浙江省高职高专院校专业带头人专业领军项目(No.lj2013148)
温州市科技计划项目(No.2013G0026)
关键词
三相四线制
级联多电平逆变器
半桥
纹波电压
充电电流
three-phase four-wire system
cascaded multilevel inverter
half-bridge
ripple voltage
charge current
