摘要
提出了一种适用于Z源逆变器交流调速系统(Adjustable Speed Drives System,简称ASDS)的前馈控制策略,用以抑制由二极管整流所带来的6倍于工频频率的纹波(简称6脉低频周期纹波)对系统的影响。由于Z源逆变器具有独特的升/降压功能,使得能通过调节直通占空比的大小得到恒定的逆变器输入直流链电压。首先,从定性和定量两个方面分析了6脉低频纹波对Z源逆变器ASDS的影响。根据前馈补偿之主动、超前补偿的特点,提出了适用于Z源逆变器ASDS的前馈补偿方法。根据全补偿理论设计了前馈补偿器。最后,通过仿真和实验验证了理论分析的正确性。
This paper presents a novel feedforward control strategy in Z-source inverter adjustable-speed drives （ASD） system,which can eliminate the dc-link voltage ripple caused by input dc voltage ripple.The input dc voltage produced from three phase diode rectifier has 6-pulse ripple.Considering the extra Buck/Boost features of the Z-source inverter,the constant dc-link voltage can be obtained from controlling the shoot-through duty cycle.The effects of the input dc voltage 6-pulse ripple have been discussed in qualitative and quantificational method,respectively.Then,a feedforward control method in Z-source inverter ASD system is proposed.Based on the full compensation theory,the feedforward controller has been designed.Lastly the simulation and experimental results verified the validity of the proposed feedforward control method in Z-source inverter ASD system.
出处
《电力电子技术》
CSCD
北大核心
2007年第12期69-71,共3页
Power Electronics
关键词
变流器
交流调速
控制
inverter
adjustable-speed drives
control
