输送机交流调速控制系统研究

Current Sharing Technology of Parallel Buck Converter

在火电厂输煤传送系统中,需要采用变频器改变交流电机频率,实现交流电机调速。文中针对输煤传送系统中传统的直流电机维护困难、成本高、对环境要求严格的问题,采用交流电机输送,节约维护成本。系统利用PLC和变频器协同控制,将检测量反馈至PLC,实现PLC对变频器的逻辑控制。更进一步地在控制系统中,采用空间矢量调制算法,对调速系统进行了建模与仿真,结果表明,改进的调速系统更精确、抗干扰能力更强,实现了良好的调速性能。

In the thermal power plant coal transport system,the frequency converter is used to change the frequency of AC motor to adjust AC motor speed. The traditional DC motor has many problems such as difficult maintenance,high cost and high environmental requirements. AC motor transport can save maintenance costs. This paper uses PLC and the frequency conversion control. The detection feedback to PLC is used to realize the logic control of inverter. Even further,this paper uses space vector modulation algorithm in the control system and the speed control system is modeled and simulated. The results show that the improved control system is precise and stronger. It can achieve a better control performance with the anti-interference ability.