变频器电压切换对变频电机绕组的影响  

Influence of Inverter Voltage Switching on Windings of Variable Frequency Motor

作　　者：刘东[1] LIU Dong(Electric Depart,Capital Engineering&Research Incorporation Limited,Beijing 100176,China)

机构地区：[1]中冶京诚工程技术有限公司电气与自动化工程技术所,北京100176

出　　处：《电气传动》2023年第12期74-79,92,共7页Electric Drive

基　　金：国家自然科学基金(2020IM020500)。

摘　　要：针对变频电机定子绕组绝缘和电压振荡问题,分析了变频器输出的脉冲电压在定子绕组、变频电缆、电抗器等传输路径中的过渡过程,推导了定子绕组线匝、输出电抗器、变频电缆的电压等效数学模型,建立了Simulink仿真模型并进行仿真。以冶金行业轧机类典型负载为例,采用大功率变频电机和变频器进行脉冲电压测试,验证了不同线匝电压斜率的变化。针对不同变频电缆引发的电压振荡,采用二阶最优拟合方法,分析了电压频谱特征,验证了电抗器对电压振荡的抑制效果。Focus on the stator winding insulation and voltage oscillation of variable frequency motor,the transition process of the pulse voltage output by the frequency converter in the transmission path of stator windings,frequency conversion cables,reactors,etc was analyzed,the voltage equivalent mathematical models for stator winding turns,output reactors,and variable frequency cables were derived,and a Simulink simulation model was established and simulated.Taking typical loads of rolling mills in the metallurgical industry as an example,pulse voltage tests were conducted using high-power variable frequency motors and frequency converters to verify the changes in voltage slopes of different wire turns.For the voltage oscillation caused by different frequency conversion cables,the 2nd-order system fitting was used to analyze the voltage spectrum characteristics,and the reactor's suppression effect for voltage oscillation was also verified.

关 键 词：电压斜率du/dt 匝间绝缘 电压振荡 变频器 变频电机 

分 类 号：TM343[电气工程—电机]