一种基于模糊优化的混合中点电位平衡算法
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摘要
针对中点电位不平衡引起功率器件应力增大和系统输出谐波增大问题,研究一种基于模糊优化的混合中点电位平衡算法。根据是否含有中矢量进行分区,不含中矢量的区域利用两电平空间矢量七段式开关序列控制算法,调节中点电位的平衡;含有中矢量的区域采用基于模糊优化的时间控制因子调节算法,使中点电位偏差最小,从而实现对中点电位的分区精细化控制。仿真和实验结果表明,该算法可实现高调制度和低调制度下不同平衡算法的平滑过渡,和时间控制因子算法相比,更有利于实现中点电位的平衡。
Aiming at neutral-point unbalance not only increases the voltage stress of the power device but also results in the output current distortion,a hybrid neutral-point balancing algorithm based on fuzzy optimization is proposed. The hybrid neutral-point balancing algorithm clarifies the sector selection according to whether or not contains medium vector.In the area of no the medium vector,two-level space vector control algorithm based on seven segment switching sequence is used to solve voltage deviation caused by the redundancy small vector. In the rest area,time controlling element of the redundant small vector is optimized by the fuzzy control to achieve the meticulous control of the neutral voltage. The simulation and experiment results shows the algorithm is better to neutral-point balance than time control factor method and the smooth transition of different balancing algorithm between the high modulation index and the low one is realized.
Aiming at neutral-point unbalance not only increases the voltage stress of the power device but also results in the output current distortion,a hybrid neutral-point balancing algorithm based on fuzzy optimization is proposed. The hybrid neutral-point balancing algorithm clarifies the sector selection according to whether or not contains medium vector.In the area of no the medium vector,two-level space vector control algorithm based on seven segment switching sequence is used to solve voltage deviation caused by the redundancy small vector. In the rest area,time controlling element of the redundant small vector is optimized by the fuzzy control to achieve the meticulous control of the neutral voltage. The simulation and experiment results shows the algorithm is better to neutral-point balance than time control factor method and the smooth transition of different balancing algorithm between the high modulation index and the low one is realized.
引文
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[4]林磊,邹云屏,钟和清,等.二极管箝位型三电平逆变器控制系统研究[J].中国电机工程学报,2005,25(15):32-39.
[5]周京华,贾斌,章小卫,等.混合式三电平中点电位平衡控制策略[J].中国电机工程学报,2013,33(124):82-89.
[6]窦真兰,程孟增,李素英,等.三电平NPC整流器控制及中点电位平衡控制技术[J].电力自动化设备,2011,31(10):31-37.
[7]范必双,谭冠政,樊绍胜,等.一种新的基于混合空间矢量调制的三电平逆变器直流侧电容电压平衡研究[J].中国电机工程学报,2012,32(27):135-141.
[8]陈鑫兵,何礼高.基于模糊控制的三电平逆变器中点电位平衡策略[J].电工技术学报,2007,22(10):102-108.
[2] JIANG W D,DU S W,CHANG L C,et al. Hybrid PWM Strategy of SVPWM and VSVPWM for NPC three-level Voltage-source inverter. IEEE Transactions on Power Electronics. 2010,25(10):2607-2619.
[3] ZHANG Y C,ZHAO Z M,ZHU J G. A hybrid PWM applied to highpower three-level inverter-fed induction-motor drive[J]. IEEE Transactions on Power Electronics,2011,58(8):3409-3420.
[4]林磊,邹云屏,钟和清,等.二极管箝位型三电平逆变器控制系统研究[J].中国电机工程学报,2005,25(15):32-39.
[5]周京华,贾斌,章小卫,等.混合式三电平中点电位平衡控制策略[J].中国电机工程学报,2013,33(124):82-89.
[6]窦真兰,程孟增,李素英,等.三电平NPC整流器控制及中点电位平衡控制技术[J].电力自动化设备,2011,31(10):31-37.
[7]范必双,谭冠政,樊绍胜,等.一种新的基于混合空间矢量调制的三电平逆变器直流侧电容电压平衡研究[J].中国电机工程学报,2012,32(27):135-141.
[8]陈鑫兵,何礼高.基于模糊控制的三电平逆变器中点电位平衡策略[J].电工技术学报,2007,22(10):102-108.
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