Hybrid Pulse Width Modulation Strategy Based on Current Harmonic Minimum Technique
Dong Kan1,2
1. Locomotive & Car Research Institute China Academy of Railway Sciences Beijing 100081 China; 2. State Key Laboratory for Traction and Control System of EMU and Locomotive Beijing 100081 China
Abstract：In traction driving system, asynchronous modulation and single pulse modulation are often used in low and high frequency regions, while in medium region, in order to improve the quality of the output waveform, optimal synchronous modulation is necessary. Current harmonic minimum PWM (CHMPWM) is one of the optimal synchronous modulation methods. Because of its excellent harmonic performance of output current, CHMPWM is considered in special. In this paper, a hybrid pulse width modulation strategy on the basis of current harmonic optimization is proposed, by considering the solution of CHMPWM angles and the influence of different angle distributions on its performance. A comparison between CHMPWM and SHEPWM is carried out by considering current harmonics and torque pulsation. By use of FPGA design, the hybrid PWM modulation strategy is implemented. As a result, a smooth transition between different modulation methods is achieved, and the harmonics features of motor current in medium and high frequency regions are improved. Simulation and experimental results confirm the effectiveness and validity of the proposed scheme.
[1] 刘志刚, 叶斌, 梁辉. 电力电子学[M]. 北京: 北京交通大学出版社, 2004. [2] Holmes D G, Thomas A Lipo. Pulse width modu- lation for power converters: principles and practice[M]. New Jersey: Wiley-IEEE Press, 2003. [3] 马志文, 郑琼林, 林飞. 具有全调制范围的空间矢量脉宽调制算法研究[J]. 北京交通大学学报, 2007, 31(2): 89-102. Ma Zhiwen, Zheng Qionglin, Lin Fei. Study of space vector PWM algorithm with entire modulation range[J]. Journal of Beijing Jiaotong University, 2007, 31(2): 89-102. [4] 王琛琛, 周明磊, 游小杰. 大功率交流电力机车脉宽调制方法[J]. 电工技术学报, 2012, 27(2): 173- 178. Wang Chenchen, Zhou Minglei, You Xiaojie. Research on the PWM method of high power AC electrical locomotive[J]. Transactions of China Elec- trotechnical Society, 2012, 27(2): 173-178. [5] Narayanan G, Ranganathan V T. Extension of operation of space vector PWM strategies with low switching frequencies using different over- modulation algorithms[J]. IEEE Transactions on Power Electronics, 2002, 17(5): 788-798. [6] 谷鑫, 姜勃, 耿强, 等. 基于3次谐波控制及脉冲波动分析的三电平SHE-PWM调制优化策略[J]. 电工技术学报, 2015, 30(7): 88-96. Gu Xin, Jiang Bo, Geng Qiang, An optimal SHE- PWM modulation strategy for three-level NPC converter based on third harmonic control and pulse fluctuation analysis[J]. Transactions of China Elec- trotechnical Society, 2015, 30(7): 88-96. [7] 董侃, 刁利军. 基于基本矢量钳位策略的过调制算法研究[J]. 铁道学报, 2014, 36(4): 35-40. Dong Kan, Diao Lijun. Research on over-modulation algorithm based on basic bus clamping strategy[J]. Journal of the China Railway Society, 2014, 36(4): 35-40. [8] Buja G S. Optimum output waveforms in PWM inverters[J]. IEEE Transactions on Industry Appli- cations, 1980, 16(6): 830-836. [9] Zach F C, Ertl H. Efficiency optimal control for AC drives with PWM inverters[J]. IEEE Transactions on Industry Applications, 1985, 21(4): 987-1000. [10] Taniguchi K, Irie H. Trapezoidal modulating signal for three-phase PWM inverter[J]. IEEE Transactions on Industrial Electronics, 1986, 33(2): 193-200. [11] 王堃, 游小杰, 王琛琛, 等. 低开关频率下SHEPWM和SVPWM同步调制策略比较研究[J]. 电工技术学报, 2015, 30(14): 333-341. Wang Kun, You Xiaojie, Wang Chenchen, et al. Research on the comparison of synchronized modu- lation of SHEPWM and SVPWM under low switching frequency[J]. Transactions of China Electrotechnical Society, 2015, 30(14): 333-341. [12] 周娟, 魏琛, 杨宇, 等. 逆变器简化PWM算法及抑制共模电压策略[J]. 电工技术学报, 2014, 29(8): 158-165. Zhou Juan, Wei Chen, Yang Yu, et al. Inverter simplified algorithm of PWM and inhibit common- mode voltage strategy[J]. Transactions of China Electrotechnical Society, 2014, 29(8): 158-165. [13] 孙大南. 地铁车辆牵引电传动系统控制关键技术研究[D]. 北京: 北京交通大学, 2011. [14] Abuja G S, Indri G B. Optimal pulse width modulation for feeding AC motors[J]. IEEE Transactions on Industry Applications, 1977, 13(1): 38-44. [15] Bose Bimal K. Modern power electronics and AC drives[M]. Beijing: China Machine Press, 2005. [16] 周明磊, 游小杰, 王琛琛. 电流谐波最小PWM开关角的计算及谐波特性分析[J]. 中国电机工程学报, 2014, 34(15): 2362-2370. Zhou Minglei, You Xiaojie, Wang Chenchen. Switching angle calculation and harmonic analysis of current harmonic minimum PWM[J]. Proceedings of the CSEE, 2014, 34(15): 2362-2370. [17] 王从刚, 何凤有, 邓庆伟. 电流谐波最优PWM开关角计算及数字实现[J]. 电测与仪表, 2012, 49(8): 14-17. Wang Conggang, He Fengyou, Deng Qingwei. The current harmonic optimal PWM method and its digital implementation[J]. Electrical Measurement & Instrumentation, 2012, 49(8): 14-17. [18] 高尚. 基于MATLAB遗传算法优化工具箱的优化计算[J]. 微型电脑应用, 2002, 18(8): 52-54. Gao Shang. Optimization computing based on the genetic algorithm optimization toolbox in Matlab[J]. Microcomputer Applications, 2002, 18(8): 52-54. [19] 王榕生, 吴汉光. 消谐法SHEPWM的谐波影响数值分析[J]. 电工技术学报, 2011, 26(9): 183-189. Wang Rongsheng, Wu Hanguang. Numerical analysis of harmonic influence for selected harmonic elimi- nation PWM[J]. Transactions of China Electro- technical Society, 2011, 26(9): 183-189. [20] Jason R, Xin Geng, Patrick L. Modulation based harmonic elimination[J]. IEEE Transactions on Power Electronics, 2007, 22(1): 336-340.
2017, Vol. 32 
