无电流传感器的PWM整流器的仿真研究  

Study on the Sensorless Current Control Strategy of Three-Phase Voltage-Source AC/DC PWM Rectifier

作　　者：张笑微[1] 杨青[2] 

机构地区：[1]西南科技大学,四川绵阳621010 [2]湖南工程学院,湖南湘潭411101

出　　处：《电力电子技术》2004年第6期69-71,共3页Power Electronics

基　　金：四川省应用基础研究计划课题(02GY029-020)

摘　　要：三相AC/DCPWM整流器能提高电力系统功率因数,减少谐波污染,用于变频器的整流侧可使功率双向流动。对其控制方法有直接电流控制和间接电流控制两种,前者至少需要两个高性能的电流传感器。本文提出了采用电流观测器的间接电流控制方法,既克服了相位和幅值控制的间接电流控制方法中动态响应不好的缺点,又节省了昂贵的电流传感器,具有成本低的优点。该电流观测器由检测电网电压、整流器直流输出电压和三相开关函数来估算电流值,其关键部分是开关函数的检测和输入电流的构造。文中通过理论分析得到了电流观测器的数学模型。在一定的假设前提下,推导出了电流观测值的简化表达式。采用Matlab数字仿真的方法得到了电流观测器的值,并与直接电流控制检测的实际电流波形进行了对比。最后在功率开放平台PE鄄PRO上做了实验验证。Three-phase AC/DC PWM rectifier can improve power factor and decrease harmonic contami-nation.Bi-directional power flow is realized when this rectifier is used at the commutating side of an in-verter.The rectifier can be controlled by direct and indirect current control schemes.The former requires at least two current sensors with high capability.The latter is put forward to use current observer,which is cost-effective by improving the dynamic response compared with the phase and amplitude control in indirect scheme and eliminating the expensive current sensors.The current observer estimates the current by detect-ing phase voltage,DC output voltage of the rectifier and three-phase switch functions.Yet it is crucial to detect switch functions and estimate input currents.Its mathematical model is acquired by theoretical analysis and simplified expressions of currents observer are deduced under certain hypothesis.The value of the cur-rent observer is acquired by digital simulation in Matlab and compared with the actual current wave con-trolled by direct current control scheme.The experimental results are verified on power system PE-PRO.

关 键 词：脉宽调制 整流器 电流控制 

分 类 号：TM461[电气工程—电器]