考虑最佳开关序列的三电平变换器非正交坐标系空间矢量调制简化算法
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摘要
在三电平变换器的控制过程中,相较于传统正交坐标系下的空间矢量调制算法,60°非正交坐标系算法能够大大简化计算过程,因此得到了广泛应用。但是在最佳开关序列的实现过程中,如果仍采用和正交坐标系算法一样的查表方法,则无法充分发挥该算法在简单性和直观性方面的优势。从60°非正交坐标系矢量空间的独特对称性出发,在传统最佳开关序列实现方法的基础上,提出一种仅需两步排序即可完成的简化方法,既便捷地实现了最佳开关序列,又充分发挥了非正交坐标系简化计算的优势。通过仿真和实验对所提算法的有效性进行了验证,结果表明,该简化算法能够实现与正交坐标系算法一致的输出波形质量和谐波性能。
In three-level converter applications, the nonorthogonal frame space vector modulation method is widely used, because it is simpler than conventional orthogonal frame method. However, the implementation of optimal switching sequences based on look up table does not take advantage of the simplicity and intuitiveness of this method. Based on the unique symmetric property of nonorthogonal vector space, a new simple implementation process is proposed in this paper. This new method consists of only two steps of adjustment, and assures both the optimal switching sequences and the simplicity of nonorthogonal algorithm. The new method is verified by simulation and experiment in comparison with conventional orthogonal algorithm, and the results confirm that the same output waveform and harmonic performance are maintained.
In three-level converter applications, the nonorthogonal frame space vector modulation method is widely used, because it is simpler than conventional orthogonal frame method. However, the implementation of optimal switching sequences based on look up table does not take advantage of the simplicity and intuitiveness of this method. Based on the unique symmetric property of nonorthogonal vector space, a new simple implementation process is proposed in this paper. This new method consists of only two steps of adjustment, and assures both the optimal switching sequences and the simplicity of nonorthogonal algorithm. The new method is verified by simulation and experiment in comparison with conventional orthogonal algorithm, and the results confirm that the same output waveform and harmonic performance are maintained.
引文
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[15]Brückner T,Holmes D G.Optimal pulse-width modulation for three-level inverters[J].IEEE Transactions on Power Electronics,2005,20(1):82-89.
[16]Pou J,Pindado R,Boroyevich D,et al.Evaluation of the low-frequency neutral-point voltage oscillations in the three-level inverter[J].IEEE Transactions on Power Electronics,2005,52(6):1582-1588.
[17]Chen Wei,Dai Wenkai,Wang Zhiqiang,et al.Optimal space vector pulse width modulation strategy of neutral point clamped three-level inverter for output current ripple reduction[J].IET Power Electronics,2017,10(12):1638-1646.
[18]Irfan Ahmed,Vijay B Borghate,Amarendra Matsa,et al.Simplified space vector modulation techniques for multilevel inverters[J].IEEE Transactions on Power Electronics,2016,31(12):8483-8499.
[19]Sebaaly F,Vahedi H,Kanaan H,et al.Design and implementation of space vector modulation based sliding mode control for grid-connected 3LNPCinverter[J].IEEE Transactions on Industrial Electronics,2016,63(12):7854-7863.
[20]何湘宁,陈阿莲.多电平变换器的理论和应用技术[M].北京:机械工业出版社,2006.
[21]李永东,肖曦,高跃.大容量多电平变换器:原理·控制·应用[M].北京:科学出版社,2005.
[2]Edpuganti A,Rathore A.A survey of low switching frequency modulation techniques for medium-voltage multilevel converters[J].IEEE Transactions on Industry Applications,2015,51(5):4212-4228.
[3]Nabae A,Takahashi I,Akagi H.A new neutralpoint-clamped PWM inverter[J].IEEE Transactions on Industry Applications,1981,17(5):518-523.
[4]李敏裕,马晓军,魏曙光,等.T型逆变器中点电压全范围精确平衡研究[J].电工技术学报,2018,33(8):1814-1826.Li Minyu,Ma Xiaojun,Wei Shuguang,et al.Research on full range accurate balance of neutral point voltage for T-type inverter[J].Transactions of China Electrotechnical Society,2018,33(8):1814-1826.
[5]戴鹏,石祥龙,朱晓莹,等.有源钳位三电平变频器改进SVPWM策略[J].电工技术学报,2017,32(14):137-145.Dai Peng,Shi Xianglong,Zhu Xiaoying,et al.Improved SVPWM strategies for active neutral point clamped converters[J].Transactions of China Electrotechnical Society,2017,32(14):137-145.
[6]王伟胜,陈阿莲,柴锦,等.基于简化SVPWM的Z源三电平逆变器中点电位控制方法[J].电工技术学报,2018,33(8):1835-1843.Wang Weisheng,Chen Alian,Chai Jin,et al.The neutral-point balancing method for Z source neutral point clamped inverter based on simplified SVPWM[J].Transactions of China Electrotechnical Society,2018,33(8):1835-1843.
[7]姜卫东,赵德勇,胡杨,等.基于载波实现的二极管钳位型三电平逆变器虚拟空间矢量脉宽调制方法[J].电工技术学报,2016,31(12):153-160.Jiang Weidong,Zhao Deyong,Hu Yang,et al.Carrier-based virtual space vector pulse width modulation for diode clamped three-level inverter[J]Transactions of China Electrotechnical Society,2016,31(12):153-160.
[8]刘勇超,葛兴来,蒲俊楷,等.四开关三相逆变器全调制度范围内两种等效PWM算法[J].电工技术学报,2017,32(2):206-215,227.Liu Yongchao,Ge Xinglai,Pu Junkai,et al.Two types of equivalent PWM algorithms in the full modulation region for four-switch three-phase inverter[J].Transactions of China Electrotechnical Society,2017,32(2):206-215,227.
[9]Celanovic N,Boroyevich D.A fast space vector modulation algorithm for multilevel three-phase converters[J].IEEE Transactions on Industry Applications,2001,37(2):637-641.
[10]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.
[11]Gopinath A,Aneesh Mohamed A S,Baiju M R.Fractal based space vector PWM for multilevel inverters-a novel approach[J].IEEE Transactions on Industrial Electronics,2009,56(4):1230-1237.
[12]Szczepankowski P,Nieznanski J.Virtual space vector pulse width modulation algorithm for threelevel NPC converters based on the final element shape functions[C]//39th IEEE Industrial Electronics Society Annual Conference,Beijing,China,2013:3824-3829.
[13]张传金,侯洁,唐轶,等.非正交三维坐标系下多电平空间矢量调制策略[J].电工技术学报,2017,32(24):160-173.Zhang Chuanjin,Hou Jie,Tang Yi,et al.Multi-level space vector modulation strategy in a non-orthogonal three-dimensional coordinate system[J].Transactions of China Electrotechnical Society,2017,32(24):160-173.
[14]McGrath B,Holmes D,Lipo T.Optimized space vector switching sequences for multilevel inverters[J].IEEE Transactions on Power Electronics,2003,18(6):1293-1301.
[15]Brückner T,Holmes D G.Optimal pulse-width modulation for three-level inverters[J].IEEE Transactions on Power Electronics,2005,20(1):82-89.
[16]Pou J,Pindado R,Boroyevich D,et al.Evaluation of the low-frequency neutral-point voltage oscillations in the three-level inverter[J].IEEE Transactions on Power Electronics,2005,52(6):1582-1588.
[17]Chen Wei,Dai Wenkai,Wang Zhiqiang,et al.Optimal space vector pulse width modulation strategy of neutral point clamped three-level inverter for output current ripple reduction[J].IET Power Electronics,2017,10(12):1638-1646.
[18]Irfan Ahmed,Vijay B Borghate,Amarendra Matsa,et al.Simplified space vector modulation techniques for multilevel inverters[J].IEEE Transactions on Power Electronics,2016,31(12):8483-8499.
[19]Sebaaly F,Vahedi H,Kanaan H,et al.Design and implementation of space vector modulation based sliding mode control for grid-connected 3LNPCinverter[J].IEEE Transactions on Industrial Electronics,2016,63(12):7854-7863.
[20]何湘宁,陈阿莲.多电平变换器的理论和应用技术[M].北京:机械工业出版社,2006.
[21]李永东,肖曦,高跃.大容量多电平变换器:原理·控制·应用[M].北京:科学出版社,2005.