摘要
针对PWM整流器虚拟磁链定向矢量控制中存在因积分初始值选取不当造成的直流偏移和磁链振荡问题,提出了一种磁链改进控制策略。以分析虚拟磁链振荡产生的因素为基础,建立了虚拟磁链振荡模型,并通过对系统有功、无功电流特性的研究,提出了将虚拟磁链与PWM整流器控制结合起来综合考虑,利用虚拟磁链微分负反馈和有功电流共同作用来抑制虚拟磁链振荡的控制策略。理论分析表明该方法能有效抑制虚拟磁链、直流母线电压的振荡,仿真和实验验证了所提控制策略的正确性和可行性。
To solve the DC drift problem caused by a wrong initial value selecting of integer in virtual flux oriented vector control for PWM rectifier,an improved control strategy of virtual flux observer was pro-posed.Based on analyzing the factors of virtual flux oscillation,the model of flux oscillation was con-structed in this paper,and the modified control scheme was proposed by researching the characteristics of system active and reactive currents.The proposed control strategy considered the control of PWM rectifier and virtual flux synthetically,therefore the virtual flux oscillation was restrained by controlling the virtual flux differential negative feedback and active current.The theoretical analysis show that the proposed scheme can decrease the oscillation of virtual flux and DC voltage.The validity and feasibility of the pro-posed method are verified by simulation and experiment results.
出处
《电机与控制学报》
EI
CSCD
北大核心
2010年第7期23-28,35,共7页
Electric Machines and Control
基金
陕西省"13115"科技创新工程重大科技专项项目(2007ZDKG-29)
陕西省重点学科建设专项资金资助项目(10700-080903)
关键词
PWM整流器
虚拟电网磁链
矢量控制
微分负反馈
PWM rectifier
Virtual line-flux-linkage
Vector control
Differential negative feedback
