离散变频技术在石油天然气站异步电机中的应用  

Application of Discrete Frequency Conversion Technology in Asynchronous Motor of Oil and Gas Station

作　　者：丁勇 DING Yong(China Petroleum Pipeline Engineering Corporation,Shenyang 110000,China)

机构地区：[1]中国石油天然气管道工程有限公司,沈阳110000

出　　处：《自动化与仪表》2020年第7期96-100,108,共6页Automation & Instrumentation

摘　　要：异步电机转速易受电磁干扰限制,为提高异步电机的变频性能,研究离散变频技术在石油天然气站异步电机中的应用。该文利用异步电机的四分频触发方式,得到异步电机变频波形互差相等的角度,通过推断异步电机供电电源的分频数,分析异步电机的离散变频相序。根据得出的变频相序设计异步电机的等效电路,并计算异步电机定子电流和转子电流,通过异步电机正、负序电压产生的正、负电磁转矩,完成石油天然气站异步电机的起动转矩计算,达到抗电磁干扰的目的,从而实现石油天然气站异步电机的离散变频。实验结果证明,该技术可有效提升异步电机的变频性能,且在不同程度的电磁干扰下均具有较强的抗干扰效果,达到了预设目标。In order to improve the frequency conversion performance of asynchronous motor,the application of discrete frequency conversion technology in oil and gas station asynchronous motor is studied.By using the four frequency division trigger mode of asynchronous motor,the angle that the frequency conversion waveforms of asynchronous motor are equal to each other is obtained.By inferring the frequency division number of power supply of asynchronous motor,the discrete frequency conversion phase sequence of asynchronous motor is analyzed.According to the obtained frequency conversion phase sequence,the equivalent circuit of the asynchronous motor is designed,and the stator current and rotor current of the asynchronous motor are calculated.Through the positive and negative electromagnetic torque generated by the positive and negative sequence voltage of the asynchronous motor,the starting torque of the asynchronous motor in the oil and gas station is calculated,so as to achieve the purpose of anti electromagnetic interference,and realize the discrete frequency conversion of the asynchronous motor in the oil and gas station.The experimental results show that the technology can effectively improve the frequency conversion performance of asynchronous motor,and has strong anti-interference effect under different levels of electromagnetic interference,and achieves the preset goal.

关 键 词：离散变频 天然气站 异步电机 起动转矩 电磁干扰 转矩计算 

分 类 号：TM921[电气工程—电力电子与电力传动]