矿井交流提升机调速控制系统的研究

针对矿井提升机电动机难以实现平滑调速,调节性能差,调速过程中损耗了大量的转差功率等不足,提出了将斩波串级调速应用于矿井提升机电控系统的方案。相对于常规串级调速系统,系统在转子直流回路中加入了直流斩波器。利用整流桥和由IGCT构成的直流斩波电路来连续无级改变电机转子回路电阻以实现平滑调速。控制方式运用具有电流负反馈与转速负反馈的双闭环控制,可以提高静态调速精度,并获得较好的动态特性。系统软件主要对电流环和转速环进行了描述。现场应用证明,该方案节能效果好,调速性能大大改善,不但有效地提高了系统的功率因数,而且还减少了装置体积和生产成本。

Research on Speed Control System of Alternating Lift for Mine

In order to solve the problems in motor of mine lift including difficult stepless speed control,worse adjustment quality and large slip power loss,chopping cascade speed was introduced to be applied in electronic control system of mine lift.Direct current chopper was added into the direct current circuit of rotor in this system.Rectifier bridge and DC chopping circuit composed by IGCT was applied to continuous changing resistance of rotor circuit,thus stepless speed was realized.The control manner could improve static speed precision and obtain better dynamic quality by double closed loop control of current and speed negative feed.Software of the system could calculate current circle and rotate speed.Application showed good energy conservation effect and speed quality.The system improved power factor and reduced device volume and production cost.