Model Predictive Direct Torque Control for Permanent Magnet Synchronous Machines Based on Duty Ratio Modulation
Niu Feng1,2,Li Kui1,Wang Yao1
1. Province-Ministry Joint Key Lab of Electromagnetic Field and Electrical Apparatus Reliability Hebei University of Technology Tianjin 300130 China 2. Electric Machines and Drives Lab Michigan State University East Lansing 48824 USA
Abstract:In order to solve the problems of traditional direct torque control(DTC) such as high torque ripple,high stator flux ripple and inconstant switching frequency,a model predictive direct torque control(MPDTC) strategy based on duty ratio modulation is proposed in this paper. The mathematical models of torque and stator flux slopes are presented,and the duty ratio of the selected voltage vector is determined according to the total errors of torque and stator flux. Three different methods to determine the duty ratio are presented based on different control objectives,namely DRM-final,DRM-mean and DRM-rms. The mathematical models are presented and the comparative evaluation is conducted through numerous criteria. Considering the control delay in practical application,model predictive control(MPC) is employed to predict the machine variables. Hence,the desired voltage vector and its duty ratio can be obtained one sampling interval ahead. The simulation results indicate that the torque ripple and stator flux ripple are reduced under the control strategy proposed while the switching frequency stays constant and the sampling frequency is also reduced.
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. Transactions of China Electrotechnical Society, 2014, 29(11): 20-29.
[1] Takahashi I,Noguchi T. A new quick-response and high-efficiency control strategy of an induction motor[J]. IEEE Transactions on Industry Applications,1986,22(5): 820-827. [2] Buja G S,Kazmierkowski M P. Direct torque control of PWM inverter-fed AC motors-a survey[J]. IEEE Transactions on Industrial Electronics,2004,51(4): 744-757. [3] 张兴,魏东东,杨淑英,等. 基于DSVM混合磁链模型感应电机直接转矩控制[J]. 电工技术学报,2010,25(11): 62-67. Zhang Xing,Wei Dongdong,Yang Shuying,et al. DTC system based on hybrid flux linkage model and discrete space vector modulation[J]. Transactions of China Electrotechnical Society,2010,25(11): 62-67. [4] 刘伟,沈宏,高立刚,等. 无刷双馈风力发电机直接转矩控制系统研究[J]. 电力系统保护与控制,2010,38(5): 77-81. Liu Wei,Shen Hong,Gao Ligang,et al. Study on direct torque control of brushless doubly-fed machines used for wind power generation[J]. Power System Protection and Control,2010,38(5): 77-81. [5] 刘钰山,葛宝明,毕大强,等. 基于改进的直接转矩控制的风力机模拟系统[J]. 电力系统保护与控制,2010,38(18): 140-144. Liu Yushan,Ge Baoming,Bi Daqiang,et al. Improved direct torque control based wind turbine simulation system[J]. Power System Protection and Control,2010,38(18): 140-144. [6] 王玲芝. 改进的永磁同步电机直接转矩控制系统仿真实现[J]. 电力系统保护与控制,2009,37(19): 65-68. Wang Lingzhi. Simulation of improved direct torque control system for permanent magnet synchronous motor[J]. Power System Protection and Control,2009,37(19): 65-68. [7] 廖永衡,冯晓云,王珍. 无差拍空间矢量调制直接转矩控制简化设计[J]. 电工技术学报,2011,26(6): 95-101. Liao Yongheng,Feng Xiaoyun,Wang Zhen. Simplified design of deadbeat direct torque control based on space vector modulation[J]. Transactions of China Electrotechnical Society,2011,26(6): 95-101. [8] Geyer T,Papafotiou G,Morari M. Model predictive direct torque control-part I: concept,algorithm,and analysis[J]. IEEE Transactions on Power Electronics,2009,56(6): 1894-1905. [9] Preindl M,Bolognani S. Model predictive direct torque control with finite control set for PMSM drive systems,part 2: field weakening operation[J]. IEEE Transactions on Industrial Informatics,2013,9(2): 648-657. [10] 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. [11] Mir S,Elbuluk M E. Precision torque control in inverter-fed induction machines using fuzzy logic[C]. 26th IEEE Power Electronics Specialists Conference,Atlanta,GA,USA,1995,1: 396-401. [12] 徐艳平,钟彦儒. 基于占空比控制的永磁同步电机新型直接转矩控制策略[J]. 电工技术学报,2009,24(10): 27-32. Xu Yanping,Zhong Yanru. A novel direct torque control strategy of permanent magnet synchronous motors based on duty ratio control[J]. Transactions of China Electrotechnical Society,2009,24(10): 27-32. [13] 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. [14] Pacas M,Weber J. Predictive direct torque control for the PM synchronous machine[J]. IEEE Transactions on Industrial Electronics,2005,52(5): 1350-1356. [15] Lee K B,Song J H,Choy I,et al. Torque ripple reduction in DTC of induction motor driven by three-level inverter with low switching frequency[J]. IEEE Transactions on Power Electronics,2002,17(2): 255-264. [16] Kang J K,Sul S K. New direct toque control of induction motor for minimum torque ripple and constant switching frequency[J]. IEEE Transactions on Industry Applications,1999,35(5): 1076-1082. [17] 徐艳平,钟彦儒. 扇区细分和占空比控制相结合的的永磁同步电机直接转矩控制[J]. 中国电机工程学报,2009,29(3): 102-108. Xu Yanping,Zhong Yanru. Sectors subdivision and duty ratio control combined direct torque control for permanent magnet synchronous motors[J]. Proceedings of the CSEE,2009,29(3): 102-108.