Abstract：In order to overcome the problems of large torque,flux ripples,and variable switching frequency existing in the direct torque control (DTC) for the permanent magnet synchronous motors (PMSM),an improved direct torque control strategy with a fixed switching frequency based on the simple duty ratio is proposed.The influence of the voltage vector on the torque and the flux with different angular velocities and stator flux positions is analyzed.A simple calculation of the duty cycle is then designed.The PWM modulation is generated based on the vector control (VC) to ensure the fixed switch frequency of the inverter.Simulation and experimental results validate that the proposed method is simple and robust,can diminish the torque and flux turbulence effectively,ensure the fixed switch frequency,and has better dynamic performances.
吕帅帅,林辉,李兵强. 开关频率恒定与占空比调制相结合的 PMSM-DTC控制[J]. 电工技术学报, 2016, 31(3): 72-80.
Lü Shuaishuai, Lin Hui, Li Bingqiang. Direct Torque Control Based on Simple Duty Ratio and Fixed Switching Frequency for PMSM. Transactions of China Electrotechnical Society, 2016, 31(3): 72-80.
[1] Zhong L,Rahman M F,Hu W Y,et al.Analysis of direct torque control in permanent magnet synchronous motor drives[J].IEEE Transactions on Power Electronics,1997,12(3):528-536. [2] Zhong L,Rahman M F,Hu W Y,et al.A direct torque controller for permanent magnet synchronous motor drives[J].IEEE Transactions on Energy Conversion,1999,14(3):637-642. [3] Siami M,Gholamian S A,Yousefi M.A comparative study between direct torque control and predictive torque control for axial flux permanent magnet synchronous machines[J].Journal of Electrical Engineering-Elektrotechnicky Casopis,2013,64(6):346-353. [4] Ahmed T,Das A,Halder K K.Comparison of DTC and FOC for FSTP inverter fed IPMSM drives[C]//2013 International Conference on Electrical Information and Communication Technology(EICT),Khulna,2013:1-5. [5] Tang L,Zhong L,Rahman M F,et al.A novel direct torque controlled interior permanent magnet synchronous machine drive with low ripple in flux and torque and fixed switching frequency[J].IEEE Transactions on Power Electronics,2004,19(2):346-354. [6] Romeral L,Fabrega A,Cusido J,et al.Torque ripple reduction in a PMSM driven by direct torque control[C]//IEEE Power Electronics Specialists Conference,Rhodes,2008:4745-4751. [7] 徐艳平,钟彦儒,杨惠.一种基于空间矢量调制的永磁同步电动机新型直接转矩控制方案[J].电工技术学报,2008,23(11):47-52. Xu Yanping,Zhong Yanru,Yang Hui.A novel direct torque control scheme for permanent magnet synchronous motors based on space vector modulation[J].Transactions of China Electrotechnical Society,2008,23(11):47-52. [8] Kang J K,Sul S K.Analysis and prediction of inverter switching frequency in direct torque control of induction machine based on hysteresis bands and machine parameters[J].IEEE Transactions on Industrial Electronics,2001,48(3):545-553. [9] 廖晓钟,邵立伟.直接转矩控制的十二区段控制方法[J].中国电机工程学报,2005,25(14):93-97. Liao Xiaozhong,Shao Liwei.The twelve-section control methods of direct torque control[J].Proceedings of the CSEE,2005,25(14):93-97. [10]Preindl M,Bolognani S.Model predictive direct torque control with finite control set for pmsm drive systems,part 1:maximum torque per ampere operation[J].IEEE Transactions on Industrial Informatics,2013,9(4):1912-1921. [11]Geyer T,Papafotiou G,Morari M.Model predictive direct torque control—part Ⅰ:concept,algorithm and analysis[J].IEEE Transactions on Industrial,2009,56(6):1894-1905. [12]Zhu Hao,Xiao Xi,Li Yongdong.Torque ripple reduction of the torque predictive control scheme for permanent-magnet synchronous motors[J].IEEE Transactions on Industrial Electronics,2012,59(2):871-877. [13]Kim S H,Seok J K.Finite-settling-steps direct torque and flux control for torque-controlled interior pm motors at voltage limits[J].IEEE Transactions on Industry Applications,2014,50(5):3374-3381. [14]牛峰,李奎,王尧.基于占空比调制的永磁同步电机直接转矩控制[J].电工技术学报,2014,29(11):20-29. Niu Feng,Li Kui,Wang Yao.Model predictive direct torque control for permanent magnet synchronous machines based on duty ratio modulation[J].Transactions of China Electrotechnical Society,2014,29(11):20-29. [15]魏欣,陈大跃,赵春宇.一种基于占空比控制技术的异步电机直接转矩控制方案[J].中国电机工程学报,2005,25(14):93-97. Wei Xin,Chen Dayue,Zhao Chunyu.A new direct torque control strategy of induction motors based on duty ratio control technique[J].Proceedings of the CSEE,2005,25(14):93-97. [16]李政学,张永昌,李正熙,等.基于简单占空比调节的异步电机直接转矩控制[J].电工技术学,2015,30(1):72-80. Li Zhengxue,Zhang Yongchang,Li Zhengxi,et al.A direct torque control strategy of induction motor drives with simple duty ratio regulator[J].Transactions of China Electrotechnical Society,2015,30(1):72-80. [17]Zhang Yongchang,Zhu Jianguo.Direct torque control of permanent magnet synchronous motor with reduced torque ripple and commutation frequency[J].IEEE Transactions on Power Electronics,2011,26(1):235-248. [18]刘军,刘丁,吴浦升,等.基于模糊控制调节电压矢量作用时间策略的永磁同步电机直接转矩控制仿真研究[J].中国电机工程学报,2004,24(10):150-154. Liu Jun,Liu Ding,Wu Pusheng,et al.The simulation analysis of permanent magnet synchronous motor based on the strategy of modulating the time of voltage vector[J].Proceedings of the CSEE,2004,24(10):150-154. [19]Zhang Yongchang,Xie Wei,Li Zhengxi,et al.Model predictive direct power control of a PWM rectifier with duty cycle optimization[J].IEEE Transactions on Power Electronics,2013,28(11):5343-5351.
2016, Vol. 31 
