The movement law and electric driving system are analyzed. Variable frequency technique used in the system is discussed and PLC is used for automatic control of the pumping unit.
分析了数控抽油机的运动规律及电力拖动系统，论述了变频调速技术在系统中的应用。应用可编程控制器(PLC)完成抽油系统的自动控制。
Theoretic basis and application effect of using variable frequency regulation technique in power demand side were analyzed.
对电力需求侧采用变频技术的理论依据及实际应用中取得的效果进行了分析。
And using the frequency variable adjusting speed technique to control the speed of benzole cooling pump automatically, to achieve the temperature stability of the benzole.
同时利用变频调速自动控制粗苯冷却泵的转速，实现粗苯温度的稳定。
It can enhance the response speed of system to apply frequency variable adjusting speed technique, it is able to guarantee the optimization requirement of air-fuel ratio more satisfactory.
采用变频调速技术可以提高系统的响应速度，能比较满意地保证空(气)燃(料)比的优化需要。
The principle of cascade H-bridge converter is analyzed. Variable-Frequency Carrier Bands PWM(VFCB-PWM) technique is discussed. Cascade H-bridge converter based on VFCB-PWM technique is proposed.
分析了级联H桥型变换器的工况，讨论了载波带频率变化的PWM（VFCB-PWM）技术，提出了基于VFCB-PWM技术的级联H桥型多电平变换器。
The principle of cascade H-bridge converter is analyzed. Variable-Frequency Carrier Bands PWM(VFCB-PWM) technique is discussed. Cascade H-bridge converter based on VFCB-PWM technique is proposed.
分析了级联H桥型变换器的工况，讨论了载波带频率变化的PWM（VFCB-PWM）技术，提出了基于VFCB-PWM技术的级联H桥型多电平变换器。
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