准PR控制的三电平逆变器及中点平衡策略
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摘要
针对二极管钳位式三电平逆变器(NPC)的中点电位不平衡问题,在空间矢量调制(SVPWM)下,提出一种混合式中点电位平衡策略。在低调制度下,采用十三矢量法调制,该调制只使用1个零矢量、6个中矢量和6个大矢量来合成参考矢量,可以取得更好的平衡效果;在高调制度下,对传统七段式调制加以改进,调节正负小矢量的作用,最大限度减小中点电位波动。并采用准PR控制跟踪指令电流,根据最优二阶系统理论整定了参数。最后,在MATLAB/Simulink中搭建了仿真模型,验证了的中点平衡策略和准PR控制的正确性。
Aimed at the neutral-point unbalance problem of neutral-point clamped( NPC) three-level inverter,this paper proposed a hybrid neutral-point balance strategy under space vector pulse width modulation( SVPWM). Under low modulation index,thirteen-vector modulation was used to gain relatively batter neutral-point balance effect. This method employed 1 zero vector,6 medium vectors and 6 large vectors to synthesize the reference vector. Under high modulation index,a method which modified the traditional seven-stage centered modulation was adapted. It could minimize the fluctuation of neutral-point potential by adjusting the function time of positive or negative small vectors.Quasi-PR controller was adapted to track the command current. The parameters were chosen according to optimal theory of second-order system. At last,a simulation model was established in MATLAB / simulink to verify the correctness of middle point balancing strategy and quasi-PR control.
Aimed at the neutral-point unbalance problem of neutral-point clamped( NPC) three-level inverter,this paper proposed a hybrid neutral-point balance strategy under space vector pulse width modulation( SVPWM). Under low modulation index,thirteen-vector modulation was used to gain relatively batter neutral-point balance effect. This method employed 1 zero vector,6 medium vectors and 6 large vectors to synthesize the reference vector. Under high modulation index,a method which modified the traditional seven-stage centered modulation was adapted. It could minimize the fluctuation of neutral-point potential by adjusting the function time of positive or negative small vectors.Quasi-PR controller was adapted to track the command current. The parameters were chosen according to optimal theory of second-order system. At last,a simulation model was established in MATLAB / simulink to verify the correctness of middle point balancing strategy and quasi-PR control.
引文
[1]Nabae A,Takahashi I,Akagi H.A new neutral-point-clamped PWM inverter[J].IEEE Transactions on Industry Applications,1981,IA-17(5):518-523.
[2]Celanovic N,Boroyevich D.A comprehensive study of neutral-point voltage balancing problem in three-level neutral-point-clamped voltage source PWM inverters[J].IEEE Transactions on Power Electronics,2000,15(2):242-249.
[3]Pou J,Boroyevich D,Pindado R.Effects of imbalances and nonlinear loads on the voltage balance of a neutral-point-clamped inverter[J].IEEE Transactions on Power Electronics,2005,20(1):123-131.
[4]姚文熙,吕征宇,费万民,等.一种新的三电平中点电位滞环控制法[J].中国电机工程学报,2005,25(7):92-96.Yao Wenxi,Lu Zhengyu,Fei Wanmin.A new three-level neutral point potential hysteresis-band control[J].Proceedings of the CSEE,2005,25(7):92-96.
[5]宋文祥,陈国呈,武慧,等.一种具有中点电位平衡功能的三点平空间矢量调制方法及其实现[J].中国电机工程学报,2006,26(12):93-100.Song Wenxiang,Chen Guocheng,WU Hui.A novel SVPWM strategy and its implementation considering neutral-point potential balancing for three-level NPC inverter[J].Proceedings of the CSEE,2006,26(12):93-100.
[6]邵章平.三电平背靠背变流器系统的关键技术研究[D].合肥:合肥工业大学,2011.Shao Zhangping.Reseach on the key problems of SVPWM for NPC converters[D].Hefei:Hefei University of Technology,2011.
[7]Choi U M,Lee K B.Space vector modulation strategy for neutralpoint voltage balancing in three-level inverter systems[J].IET Power Electronics,2013,6(7):1390-1398.
[8]钱鹏,刘国海,陈兆岭,等.自消除中点电位波动的NPC三电平并联有源滤波器[J].电测与仪表,2014,51(7):65-69.Qian Peng,Liu Guohai,Chen Zhaoling,et al.NPC three-level shunt active filter with neutral-point potential fluctuation self-elimination[J].Electrical Measurement&Instrumentation,2014,51(7):65-69.
[9]仇志凌.基于LCL滤波器的三相三线并网变流器若干关键技术研究[D].杭州:浙江大学,2009.Qiu Zhiling.The study on key techniques of three-phase three-line grid-connected converter based on LCL-filter[D].Hangzhou:Zhejiang University,2009.
[10]周娟,张勇,耿乙文,等.四桥臂有源滤波器在静止坐标系下的改进PR控制[J].中国电机工程学报,2012,(6):113-120.Zhou Juan,Zhang Yong,Geng Yiwen,et al.An improved proportional resonant control strategy in the static coordinate for four-leg active power filters[J].Proceedings of the CSEE,2012,(6):113-120.
[11]周娟.四桥臂有源电力滤波器关键技术研究[D].徐州:中国矿业大学,2011.Zhou Juan.Research on the key issues of the four-leg active power filter[D].Xuzhou:China University of Mining and Technology,2011.
[12]葸代其,赵峰.一种改进的光伏并网逆变器的控制策略[J].电测与仪表,2013,50(4):107-110.Xi Daiqi,Zhao Feng.An improved control strategy for photovoltaic grid inverter[J].Electrical Measurement&Instrumentation,2013,50(4):107-110.
[13]朱红,宋怀祥.基于PR控制的单相T源光伏发电系统的研究[J].电测与仪表,2014,51(14):38-40.Hu Hong,Song Huaixiang.Research on the single-phase T source photovoltaic generating system based on PR control[J].Electrical Measurement&Instrumentation,2014,51(14):38-40.
[2]Celanovic N,Boroyevich D.A comprehensive study of neutral-point voltage balancing problem in three-level neutral-point-clamped voltage source PWM inverters[J].IEEE Transactions on Power Electronics,2000,15(2):242-249.
[3]Pou J,Boroyevich D,Pindado R.Effects of imbalances and nonlinear loads on the voltage balance of a neutral-point-clamped inverter[J].IEEE Transactions on Power Electronics,2005,20(1):123-131.
[4]姚文熙,吕征宇,费万民,等.一种新的三电平中点电位滞环控制法[J].中国电机工程学报,2005,25(7):92-96.Yao Wenxi,Lu Zhengyu,Fei Wanmin.A new three-level neutral point potential hysteresis-band control[J].Proceedings of the CSEE,2005,25(7):92-96.
[5]宋文祥,陈国呈,武慧,等.一种具有中点电位平衡功能的三点平空间矢量调制方法及其实现[J].中国电机工程学报,2006,26(12):93-100.Song Wenxiang,Chen Guocheng,WU Hui.A novel SVPWM strategy and its implementation considering neutral-point potential balancing for three-level NPC inverter[J].Proceedings of the CSEE,2006,26(12):93-100.
[6]邵章平.三电平背靠背变流器系统的关键技术研究[D].合肥:合肥工业大学,2011.Shao Zhangping.Reseach on the key problems of SVPWM for NPC converters[D].Hefei:Hefei University of Technology,2011.
[7]Choi U M,Lee K B.Space vector modulation strategy for neutralpoint voltage balancing in three-level inverter systems[J].IET Power Electronics,2013,6(7):1390-1398.
[8]钱鹏,刘国海,陈兆岭,等.自消除中点电位波动的NPC三电平并联有源滤波器[J].电测与仪表,2014,51(7):65-69.Qian Peng,Liu Guohai,Chen Zhaoling,et al.NPC three-level shunt active filter with neutral-point potential fluctuation self-elimination[J].Electrical Measurement&Instrumentation,2014,51(7):65-69.
[9]仇志凌.基于LCL滤波器的三相三线并网变流器若干关键技术研究[D].杭州:浙江大学,2009.Qiu Zhiling.The study on key techniques of three-phase three-line grid-connected converter based on LCL-filter[D].Hangzhou:Zhejiang University,2009.
[10]周娟,张勇,耿乙文,等.四桥臂有源滤波器在静止坐标系下的改进PR控制[J].中国电机工程学报,2012,(6):113-120.Zhou Juan,Zhang Yong,Geng Yiwen,et al.An improved proportional resonant control strategy in the static coordinate for four-leg active power filters[J].Proceedings of the CSEE,2012,(6):113-120.
[11]周娟.四桥臂有源电力滤波器关键技术研究[D].徐州:中国矿业大学,2011.Zhou Juan.Research on the key issues of the four-leg active power filter[D].Xuzhou:China University of Mining and Technology,2011.
[12]葸代其,赵峰.一种改进的光伏并网逆变器的控制策略[J].电测与仪表,2013,50(4):107-110.Xi Daiqi,Zhao Feng.An improved control strategy for photovoltaic grid inverter[J].Electrical Measurement&Instrumentation,2013,50(4):107-110.
[13]朱红,宋怀祥.基于PR控制的单相T源光伏发电系统的研究[J].电测与仪表,2014,51(14):38-40.Hu Hong,Song Huaixiang.Research on the single-phase T source photovoltaic generating system based on PR control[J].Electrical Measurement&Instrumentation,2014,51(14):38-40.
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