Abstract：The generalized space vector pulse-width modulation method(SVPWM) is studied for the H-bridge cascaded multilevel inverter in this paper. The explicit modulation function expression of the generalized SVPWM method is established for the single stage cascaded inverter. Various continuous SVPWM and discontinuous PWM(DPWM) methods can be easily obtained by changing the zero vector distribution coefficient. The generalized SVPWM method for the cascaded multilevel inverter is then obtained by using the carrier phase-shift technique. To avoid the complex calculations, a fast digital algorithm is introduced. Trigonometric calculations, coordinate transformations, space vector selections and dwelling time calculations are avoided by using it. Finally, an eight cascaded multilevel inverter is used to test this method both in simulation and experimentation. The harmonic characteristics are also discussed. The coincidence of the simulation and actual results shows that this method is correct and feasible.
[1] 许湘莲. 基于级联多电平逆变器的STATCOM及其控制策略研究[D]. 武汉: 华中科技大学, 2006. [2] Naderi R, Rahmati A. Phase-shifted carrier PWM technique for general cascaded inverters[J]. IEEE Transactions on Power Electronics, 2008, 23(3): 1257-1269. [3] Jana K C, Biswas S K, Thakura P. A simple and generalized space vector PWM control of cascaded H-bridge multilevel inverters[C]. IEEE International Conference on Digital Object Identifier, Mumbai, 2006: 1281-1286. [4] Trabelsi M, Ben-Brahim L, Yokoyama T, et al. An improved SVPWM method for multilevel inverters[C]. Power Electronics and Motion Control Conference, 2012 15th International Digital Object Identifier, Novi Sad, 2012, LS5c. 1: 1-7. [5] Asiminoaei L, Rodriguez P, Blaabjerg F. Application of discontinuous PWM modulation in active power filters[J]. IEEE Transactions on Power Electronics, 2008, 23(4): 1692-1706. [6] Nguyen N V, Nguyen B X, Lee H H. An optimized discontinuous PWM method to minimize switching loss for multilevel inverters[J]. IEEE Transactions on Industry Electronics, 2011, 58(9): 3958-3966. [7] 于飞, 张晓峰, 李槐树, 等. 基于零序偏移时间的低耗高性能PWM控制方法[J]. 电力系统自动化, 2005, 29(2): 39-44. Yu Fei, Zhang Xiaofeng, Li Huaishu, et al. A zero sequence offset time based low loss and high performance PWM method[J]. Automation of Electric Power System, 2005, 29(2): 39-44. [8] Ojo O. The generalized discontinuous PWM scheme for three-phase voltage source inverters[J]. IEEE Transactions on Industrial Electronics, 2004, 51(6): 1280-1289. [9] 马丰民, 吴正国, 侯新国. 基于统一PWM调制器的随机空间矢量调制[J]. 中国电机工程学报, 2007, 27(7): 98-102. Ma Fengmin, Wu Zhengguo, Hou Xinguo. Random space vector PWM based on the generalized modulator [J]. Proceeding of the CSEE, 2007, 27(7): 98-102. [10] 文小玲, 尹项根, 张哲. 三相逆变器统一空间矢量PWM实现方法[J]. 电工技术学报, 2009, 24(10): 87-93. Wen Xiaoling, Yin Xianggen, Zhang Zhe. Unified space vector PWM implementation method for three-phase inverters[J]. Transactions of China Electrotechnical Society, 2009, 24(10): 87-93. [11] 史喆, 石新春. 级联型逆变器的一种新型SVPWM方法[J]. 电工技术学报, 2005, 20(10): 30-97. Shi Zhe, Shi Xinchun. A novel technique of SVPWM based on cascaded H-bridge multi-level inverter[J]. Transactions of China Electrotechnical Society, 2005, 20(10): 30-97. [12] 黄本润, 夏立, 吴正国. H桥级联多电平逆变器相移SVPWM技术的研究[J]. 通信电源技术, 2011, 28(3): 21-24. Huang Benrun, Xia Li, Wu Zhengguo. Research of phase-shifted SVPWM based on H-bridge cascaded multilevel inverter[J]. Telecom Power Technology, 2011, 28(3): 21-24. [13] 韦力, 靳坤, 王明山. 一种新型SVPWM调制方法的研究与实现[J]. 电测与仪表, 2010, 47(532): 9-12. Wei Li, Jin Kun, Wang Mingshan. The research and implementation of a novel SVPWM modulation method[J]. Electrical Measurement & Instrumentation, 2010, 47(532): 9-12. [14] Kolar J, Ertl H, Zach F. Influence of the modulation method on the conduction and switching losses of a PWM converter system[J]. IEEE Transactions on Industry Application, 1991, 27(6): 1063-1075. [15] Grahame Holmes D, Thomas A Lipo. Pulse width modulation for power converters: principles and practice[M]. Wiley-IEEE Press, 2003.
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