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A Novel PWM Method for Multilevel Inverters |
Fei Wanmin, Du Xiaoli, Ju Rong, Wu Qin |
Nanjing Normal University Nanjing 210042 China |
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Abstract According to the impulse principle and the relative location of baricenter of PWM signal and reference signal in a section, take an five-level inverter for example, three typical PWM schemes are investigated to examine the variation of harmonics contents and fundamental control precision with the location of the baricenter of the PWM waveform in a section at a low switching frequency for PWM method of quarter wave symmetry. Based on the investigation, a novel optimum digital PWM scheme is proposed. The advantages of the new PWM method include easiness for calculating and programming, high flexibility, high quality in output waveform, high precision in fundamental control and so on. The new PWM method is not restricted to the topology and number of output levels of the multilevel inverters, and can be used in all kinds of multilevel inverters. Take five-level inverter as an example, the new PWM method is investigated by simulation and experiment. The results agree with each other very well and prove the validity, advantages and practicability.
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Received: 20 January 2009
Published: 04 March 2014
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[1] Lai Jisheng, Peng Fangzheng. Multilevel converter-a new breed of power converters[J]. IEEE Transactions on Industry Applications, 1996, 32(3): 509-517.
[2] José Rodríguez, Steffen Bernet, Wu Bin, et al. Multilevel voltage-source converter topologies for industrial medium-voltage drives[J]. IEEE Transactions on Industrial Electronics, 2007, 54(6): 2930-2945.
[3] Seo J H, Choi C H, Hyun D S. A new simplified space-vector PWM method for three-level inverters[J]. IEEE Transactions on Power Electronics, 2001, 16(4): 545-550.
[4] Brendan Peter McGrath, Donald Grahame Holmes. An analytical technique for the determination of spectral components of multilevel carrier-based PWM methods[J]. IEEE Transactions on Industrial Electronics, 2002, 49(4): 847-857.
[5] Donald Grahame Holmes, Brendan Peter McGrath. Opportunities for harmonic cancellation with carrier-based PWM for two-level and multilevel cascaded inverters[J]. IEEE Transactions on Indus- trial Applications, 2001, 37(2): 574-582.
[6] Sirisukprasert S, Lai J S, Liu T H. Optimum harmonic reduction with a wide rang of modulation indices for multilevel converters[J]. IEEE Transactions on Industrial Electronics, 2002, 49(4): 875-881.
[7] McGrath B P, Holmes D G. Multi-carrier PWM strategies for multilevel inverters[J]. IEEE Trans- actions on Industrial Electronics, 2002, 49(4): 858- 867.
[8] 吴洪洋, 何湘宁. 级联型多电平变换器PWM控制方法的仿真研究[J]. 中国电机工程学报, 2001, 21(8): 42-46.
[9] Tolbert L M, Chiasson J, McKenzie K, et al. Elimination of harmonics in a multilevel converter with nonequal DC sources[J]. IEEE Transactions on Industrial Applications, 2005, 41(1): 75-82.
[10] 孙宜峰, 阮新波. 级联型多电平逆变器的功率均衡控制策略[J]. 中国电机工程学报, 2006, 26(4): 126-133.
[11] 郑春芳, 张波, 丘东元. 基于Walsh变换的多电平逆变器谐波消除技术[J]. 电工技术学报, 2006, 21(7): 121-126.
[12] 费万民, 吕征宇, 姚文熙. 多电平逆变器特定谐波消除脉宽调制方法的仿真研究[J]. 中国电机工程学报, 2004, 24(1): 102-106.
[13] 费万民, 吕征宇, 姚文熙. 三电平逆变器特定谐波消除脉宽调制方法的研究[J]. 中国电机工程学报, 2003, 23(9): 11-15.
[14] 费万民, 阮新波, 张艳莉, 等. 多电平逆变器SHEPWM方法的初值问题研究[J]. 中国电机工程学报, 2007, 27(13): 87-92.
[15] 费万民, 张艳莉, 阮新波, 等. 三电平逆变器SHEPWM非线性方程组的求解[J]. 中国电机工程学报, 2008, 28(6): 62-68.
[16] 费万民, 张艳莉, 王学华, 等. 多电平逆变器SHEPWM问题的解的包含关系[J]. 中国电机工程学报, 2008, 28(15): 61-66.
[17] 张允, 邹云屏, 丁凯. 面积等效原理的新型多电平变换器控制算法[J]. 电气传动, 2005, 35(1): 19-22, 43. |
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