摘要
在闭环控制系统中,基于电参数的功率器件老化监测方法是电力电子可靠性领域的难点之一。以永磁同步电机直接转矩控制系统为例,研究基于磁链相图和电流的功率逆变器中功率器件老化状态的在线监测方法。首先,分析功率器件老化的特征,得到键合线老化引起通态电阻增加的结论;其次,研究得到功率器件键合线老化与磁链相图、直轴电流和三相电流峰值变化的关系,进而提出功率器件键合线老化的监测方法;最后,通过多组仿真实验验证了基于磁链相图和电流的在线监测方法均可实现功率逆变器中功率器件键合线老化状态的在线监测。其中,基于磁链相图的在线监测方法需要系统磁链出现一些波动时才易观测,此时功率器件处于失效状态,该方法并不可取;而基于三相电流的监测方法能够更为精确地监测功率器件老化状况,效果更为优越。
In a closed-loop control system,the aging monitoring method for power devices based on electrical parameters is one of the difficulties in the field of power electronics reliability.The direct torque control( DTC) system of a permanent magnet synchronous motor( PMSM) is taken as an example,and an on-line monitoring method for the aged state of power devices in a power inverter is studied based on the phase diagram of flux linkage and current.First,the aged characteristics of power devices are analyzed,and it is concluded that the on-state resistance will increase due to the aging of bond wires.Second,the relationship between power device bond wires aging and the phase diagram of flux linkage and the relationship between aging and direct axis current and three-phase current peak value are studied,and the aging monitoring methods are proposed accordingly.Finally,through several groups of simulation experiments,it is verified that both the monitoring method based on the phase diagram of flux linkage and the monitoring method based on current can realize on-line monitoring of the aged state of power device bond wires in the power inverter.The monitoring method based on the phase diagram of flux linkage is easy to observe when there are some fluctuations in the system flux,so it is not desirable considering that the power device has already been in a failure state at the same time.In comparison,the monitoring method based on three-phase current can more accurately monitor the aged state of power devices,and its effect is more advantageous.
作者
赵相睿
董超
姚婉荣
杜明星
ZHAO Xiangrui;DONG Chao;YAO Wanrong;DU Mingxing(Tianjin Key Laboratory of Complex System Control Theory and Application,Tianjin University of Technology,Tianjin 300384,China;Tianjin Zhongke Huaying Technology Co.,Ltd,Tianjin 300300,China)
出处
《电源学报》
CSCD
北大核心
2024年第4期292-300,共9页
Journal of Power Supply
基金
天津市技术创新引导专项(基金)资助项目(20YDTPJC00510)。
关键词
永磁同步电机
直接转矩控制
功率器件
键合线
老化监测
磁链相图
Permanent magnet synchronous motor(PMSM)
direct torque control(DTC)
power device
bond wire
aging monitoring
phase diagram of flux linkage
