基于高转矩电流比的开关磁阻电机DITC优化控制  

Direct Instantaneous Torque Control Optimization of Switched Reluctance Motor for High Torque per Ampere Ratio

作　　者：许爱德[1] 黄乐鹏 李倩妮 商超亿 朱景伟 XU Aide;HUANG Lepeng;LI Qianni;SHANG Chaoyi;ZHU Jingwei(Institute of Information Science and Technology,Dalian Maritime University,Dalian 116026,Liaoning,China;Institute of Marine Electrical Engineering,Dalian Maritime University,Dalian 116026,Liaoning,China)

机构地区：[1]大连海事大学信息科学技术学院,辽宁大连116026 [2]大连海事大学船舶电气工程学院,辽宁大连116026

出　　处：《电气传动》2021年第5期64-69,共6页Electric Drive

基　　金：国家自然科学基金(51407021);起重机用开关磁阻电机及其能效控制系统研究(2018J12GX039);双一流建设专项创新项目(CXXM2019SS005)。

摘　　要：针对开关磁阻电机在直接瞬时转矩控制(DITC)中电流上升初期峰峰值过高而导致转矩脉动增大和电机效率减小的问题,提出了一种基于脉宽调制(PWM)的DITC优化策略。该策略在传统DITC的基础上,依据最大转矩电流比(MTPA)的思想,分析得到电感斜率的变化点为转矩电流比最大的点,以此对每相机械角进行扇区划分,在新划分的区间中进行导通规则优化,以此选择相应的电压矢量,并通过分段变占空比调制的方法得到最优的电压矢量,其中占空比-转速-负载函数关系式适用于不同转速、负载条件。将所提算法在一台三相12/8开关磁阻电机上进行了验证,与传统DITC相比,优化后的PWM-DITC不仅减小了转矩脉动,还在相同负载条件下降低了三相定子电流,提高了电机的转矩电流比。A direct instantaneous torque control(DITC)optimization strategy for switched reluctance motor(SRM)based on pulse width modulation(PWM)was proposed.It is aimed to solve high torque ripple and low motor efficiency which caused by excessive peak-to-peak value at the preliminary stage of current rising.According to the idea of maximum torque per ampere(MTPA),the change point of inductance slope was the maximum point of torque-current ratio.Then on the basic of this point and traditional DITC scheme,the sectors of each phase mechanical angle were re-divided.As for the new sectors,the conduction rules were also re-optimized to select the corresponding voltage vectors.And the optimal voltage vector was obtained by variable subsection duty cycle modulation.In addition,the duty cycle-speed-load function was suitable for different speed and load conditions.The proposed method was verified on a three-phase 12/8 SRM.Compared with the traditional DITC,the optimized PWM-DITC not only reduces the torque ripple,but also reduces the three-phase stator current and improves the torque-current ratio of the motor under the same load condition.

关 键 词：开关磁阻电机 直接瞬时转矩控制 转矩电流比 转矩脉动 脉宽调制 

分 类 号：TM352[电气工程—电机]