矿山变频矢量控制系统效率优化方案研究

摘要

针对矿山变频调速系统感应电动机采用恒定磁通控制,存在损耗严重、运行效率低的问题,提出了一种矿山变频矢量控制系统的效率优化控制方案.该方案在两相旋转d-q坐标系下,建立了考虑定、转子铜损和铁损的系统损耗模型,推导得到不同运行工况下电动机损耗与转子磁链之间的对应关系;为改善因弱磁运行而造成的系统动态响应过慢问题,通过优化转矩电流和磁链电流比重关系,获得电动机电磁转矩的快速响应和转速跟踪.基于DSP+ FPGA控制系统搭建22 kW三电平感应电动机调速系统实验平台,实验结果表明,该优化方案可以降低感应电动机矢量控制系统运行损耗,提高系统运行效率,并保证系统的稳态性能和动态响应性能.%In view of problems of serious loss and low efficiency of operation existed in induction motor of frequency-conversion speed-regulation system controlled by constant flux,the paper put forward a kind of efficiency optimization control scheme of mine frequency-conversion vector control system.Under two-phase d-q rotating coordinate system,the scheme established loss model of the system including set and rotor copper loss and iron loss,derived corresponding relationship between motor loss and rotor flux under different operating conditions.In order to solve problem of slow dynamic response of the system caused by weak magnetic operation,it optimized proportion of torque current and flux current to get fast response of electromagnetic torque and speed tracking of the motor.It established experimental platform of speed regulation system of 22 kW three-level induction motor based on DSP-FPGA control system,and the experimental results show that the optimized scheme can reduce loss of vector control system of induction motor,improve operation efficiency of the system,and ensure steady-state performance and dynamic response performance of the system.