基于矢量控制的矿井提升机交流双馈调速系统

Mine hoist’s adjustable-speed drive system using double-fed induction motor based on vector control strategy

针对国内矿井提升机调速系统的现状,提出用基于双PWM变流器的交流双馈调速方案予以改造.给出调速系统结构图,设计了采用按电机定子磁场定向矢量控制策略的控制系统模型,该模型能实现在位势负载下转速无静差,跟踪好,定子侧单位功率因数等高性能技术指标.以660V等级的提升机为实例,用Matlab对一个提升循环中系统的各种运行状况作了详细仿真,仿真试验结果验证了此方案的可行性.

According to unsatisfactory actuality of adjustable-speed drive system in mine hoists, a new speed adjusting scheme using AC double-fed motor system with duel PWM converter was put forward to replace the traditional scheme. This adjustable-speed drive system＇ s structure graph was given, then the strategy of vector control oriented by stator field was adopted and the control system＇ s model was designed. It can realize high technical standards such as none speed static difference, good following performance and unity power factor at the stator side under weight load. Taken hoist of 660 V grade as an example, all sorts of this system＇ s working situation during one lifting cycle was simulated in detail by Matlab. The simulation results prove that this scheme is applicable.