摘要
分析了三电平双PWM变频器系统响应延迟及母线电压波动原因,提出了一种新型三电平双PWM变频器综合控制策略。前端三电平PWM整流器采用固定开关频率直接功率控制(DPC_SVM),后端三电平PWM逆变器-异步电动机采用间接磁场定向控制,增加了从逆变侧到整流侧的输出功率反馈补偿。实验结果表明,新型三电平PWM整流器控制策略及输出功率反馈补偿能有效提高系统直流环节动态响应,使减小直流母线电容成为可能。
Power response delay and dc-bus voltage fluctuations are analyzed,and then a novel integrated control scheme for three-level NPC based dual-PWM converter is proposed.The direct power control with space vector modulation（DPC_SVM）for front-end rectifier and indirect rotor field oriented control（IFOC）for back-end inverter-fed induction motor are adopted respectively.A power feed-forward control loop from inverter to rectifier side is introduced to obtain better dynamic performance for DC link.Experimental results show that the system exhibits excellent dynamic performance,which can minimize dc bus voltage fluctuations with low size of capacitors.
出处
《电工技术学报》
EI
CSCD
北大核心
2011年第11期25-31,共7页
Transactions of China Electrotechnical Society
基金
国家自然科学基金重点资助项目(50737002)
