_中点箝位型三电平逆变器中点电压低频振荡抑制方法.pdf

3519Vol.35No.19Oct.5,2015

2015105ProceedingsoftheCSEE©2015Chin.Soc.forElec.Eng.5039

DOI10.13334/j.0258-8013.pcsee.2015.19.0230258-8013(2015)19-5039-11TM464

(210094)

LowFrequencyOscillationSuppressionSchemeofNeutral-pointVoltagefor

NeutralPointClampedThree-levelInverter

LÜJianguo,HUWenbin,WUFuyun,HAJinbing,YAOKai,WUJunji

(NanjingUniversityofScienceandTechnology,Nanjing210094,JiangsuProvince,China)

ABSTRACT:InordertosuppressthelowfrequencycycleregulativeDPWMDHCR-DPWM)

oscillationofneutral-pointvoltageforthree-levelinverters,DHCR-DPWM

Traditionalsinusoidalpulsewidthmodulation(SPWM)control

hasnoeffectoncontrollingneutral-pointvoltagebalance.SPWM

Basedondiscontinuouspulsewidthmodulation(DPWM)

control,thispaperproposedadynamichalfcarrier-cycleSTM32F407-CPLD

regulativeDPWM(DHCR-DPWM)controlmethodtobalance

theneutral-pointvoltage.TheproposedDHCR-DPWMcontrol

methodsuppresseslowfrequencyoscillationofneutral-point

voltagebykeepingtheswitchesnoswitchingofacertainphase

inonecarriercycle,sotheoperationtimeofsmallpositiveand

negativevectorsisequal.ComparingwithtraditionalSPWM

0

control,theoutputwaveformsqualityandtheefficiencyofthe

systemcanbeincreasedbyusingthismethod.Theexperiment

hasbeenrealizedintheexperimentalplatformofneutralpo