一种改进的四相开关磁阻电机直接转矩控制策略研究
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摘要
针对开关磁阻电机转矩脉动大、启动时转子震荡的问题,将改进磁链估算模型和PWM技术应用到开关磁阻电机的直接转矩控制策略中。对四相开关磁阻电机的直接转矩控制策略进行了研究,设计了合适的磁链模型和开关表,分析了电机启动时转子震荡的原因,设计了参考转速变化的磁链估算模型;将PWM技术和直接转矩控制策略结合起来,提出了通过占空比调节控制周期内等效电压的大小,进而控制转矩改变量大小的方法;在Matlab/Simulink平台上,对优化前后电机的启动性能和转矩脉动抑制效果进行了仿真分析。研究结果表明:加入改进磁链估算模型后,有效解决了启动时转子震荡的问题,提高了启动转矩;引入PWM的开关磁阻电机直接转矩控制策略具有更好的转矩脉动抑制效果。
In order to solve the problem of large torque ripple and rotor vibration,a direct torque control strategy of four-phase switched reluctance motor was proposed,which was based on PWM and the improved flux model. The improved flux model and switching table,combined with the characteristics of four-phase switched reluctance motor,was designed to realize the direct torque control strategy of four-phase switched reluctance motor,which solves the problem of rotor turbulence when motor start. The PWM module was introduced into the direct torque control strategy to regulate the torque more subtly,by changing the equivalent voltage. The starting performance and torque ripple suppression effect of motor before and after optimization were simulated and compared,under Matlab/Simulink environment. The results indicate that the problem of rotor vibration during start-up is solved effectively meanwhile the starting torque is improved after applicating the improved flux model,and direct torque control strategy of switched reluctance motor with PWM has better torque ripple control effect.
In order to solve the problem of large torque ripple and rotor vibration,a direct torque control strategy of four-phase switched reluctance motor was proposed,which was based on PWM and the improved flux model. The improved flux model and switching table,combined with the characteristics of four-phase switched reluctance motor,was designed to realize the direct torque control strategy of four-phase switched reluctance motor,which solves the problem of rotor turbulence when motor start. The PWM module was introduced into the direct torque control strategy to regulate the torque more subtly,by changing the equivalent voltage. The starting performance and torque ripple suppression effect of motor before and after optimization were simulated and compared,under Matlab/Simulink environment. The results indicate that the problem of rotor vibration during start-up is solved effectively meanwhile the starting torque is improved after applicating the improved flux model,and direct torque control strategy of switched reluctance motor with PWM has better torque ripple control effect.
引文
[1]王宏华.开关磁阻电动机调速控制技术[M].2版.北京:机械工业出版社,2014.
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[9]黄向慧,张石岩.一种改进的四相开关磁阻电机直接转矩控制[J].可再生能源,2014,32(8):1124-1128.
[2]朱龙,吕晓波,徐东杰,等.基于差分进化算法的开关磁阻电机转矩脉动抑制[J].电气传动,2016,46(10):17-20.
[3]王卫东,张奕黄,陈忠松,等.开关磁阻电机直接转矩控制[J].机械研究与应用,2008,21(1):125-128.
[4]王勉华,梁媛媛,宋景哲,等.直接转矩控制在开关磁阻电机中的应用与研究[J].电机与控制应用,2008,35(2):25-28.
[5]漆汉宏,张婷婷,李珍国,等.基于DITC的开关磁阻电机转矩脉动最小化研究[J].电工技术学报,2007,2(7):136-140.
[6]SAHOO S K,PANDA S K,XU J X.Iterative learning control based direct instantaneous torque control of switched reluctance motors[C].Proceeding of 3st Annual IEEEPower Electronics Specialists Conference,Singapore:IEEE,2004.
[7]王勉华.四相开关磁阻电机直接转矩控制方法研究[J].电气传动,2011,41(4):8-11.
[8]程勇,林辉.五电平拓扑下开关磁阻电机直接瞬时转矩控制[J].电机与控制学报,2011,15(4):18-22.
[9]黄向慧,张石岩.一种改进的四相开关磁阻电机直接转矩控制[J].可再生能源,2014,32(8):1124-1128.