变电感参数三电平不可逆PWM整流器的电流PI优化控制  

Optimized PI Current Controller of Three Level Unidirectional PWM Rectifier Under Variable Inductance

作　　者：何礼高[1] 陈鑫兵[1] 

机构地区：[1]南京航空航天大学自动化学院,南京210016

出　　处：《电工技术学报》2011年第7期203-209,共7页Transactions of China Electrotechnical Society

摘　　要：在矢量控制PWM整流中,需要精确地输入电感值作为控制参数。而高功率密度AC-DC整流器中输入电感常采用铁粉心作为电感材质,这些材质磁心的电感值随着输入电压、输入电流和负载的变化而变化,电感值的变化导致电流环增益和控制参数发生变化。因此,采用传统的控制方法比较难满足宽输入电压和变电感量条件下整流器控制性能的要求。文中提出采用优化电流PI控制器的矢量控制实现三相三电平不可逆PWM整流,该策略能够在宽输入电压范围和变电感值下实现PF(Power Factor)值和电流THD的优化控制。文章在分析三电平不可逆PWM整流器电路模型基础上提出优化PI控制器的矢量控制算法实现过程,借助系统的闭环模型推导出控制器参数设计原则。最后给出的仿真波形和实验结果验证了控制方案的有效性和优越性。In vector controlled three phase three level unidirectional PWM rectifier,the exact inductor value of smoothing chock is needed,however,in compact rectifier,when iron dust core is used,the inductance is varied under different input currents,input voltages and output loads,this variation resulted in nonlinear current loop response and control parameters in digital implementation. So it is difficult to meet the demands of power factor and THD of current when in the condition of wide input voltage range and variable inductance.This paper,by analysis the modeling and current loop transfer function of rectifier,an optimized design of proportion in PI current controller is presented in order to reduce the effect of variable inductor value.Then the controller designing rules are derived with the help of current loop mode.This strategy ensures lower harmonic current and improves the power factor in full load and full range input voltage.Simulation and experimental results verify the feasibility and effectiveness of the proposed control strategy.

关 键 词：变电感参数 三电平PWM整流 矢量控制 宽输入电压 电流环 PI优化控制 

分 类 号：TM461[电气工程—电器]