三电平变流器输出电流纹波分析
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摘要
为了有效控制三电平变流器各开关器件的开关应力并保证系统运行的高效率,输出电流纹波的大小是直接影响上述性能指标的关键因素。依据相电流的数学解析式和矢量合成顺序对三电平空间矢量图区域进行划分,并推导出各个区域内相电流的变化趋势,根据此趋势求得纹波的峰峰值。运用上述方法,针对不同调制策略及工况,对电流纹波进行定量计算和对比分析。最后,通过MATLAB仿真验证了此算法的正确性,为实际工程中最优调制策略的选择和滤波器电感的定量选取提供了理论依据。
To effectively control the switching stress of each switching devices of a three-level converter and guarantee the high-efficiency operation of the system,the amplitude of the output current ripple is a key factor that directly affects the above performance index.In this paper,divide the space vector diagram based on the current mathematical expression.With seven stage vector synthesis,we can deduce the change trend of phase current in every area.According to the tendency,peak-to-peak amplitude of phase current ripple can be derived.By this method,with different modulation strategy and different working conditions,quantitative calculate and contrast analysis for the current ripple are proposed.Finally,correctness of current ripple calculation is verified in MATLAB simulation.The method provides a theoretical basis for the choice of the optimal modulation strategy and filter inductance quantitative selection in practical engineering.
To effectively control the switching stress of each switching devices of a three-level converter and guarantee the high-efficiency operation of the system,the amplitude of the output current ripple is a key factor that directly affects the above performance index.In this paper,divide the space vector diagram based on the current mathematical expression.With seven stage vector synthesis,we can deduce the change trend of phase current in every area.According to the tendency,peak-to-peak amplitude of phase current ripple can be derived.By this method,with different modulation strategy and different working conditions,quantitative calculate and contrast analysis for the current ripple are proposed.Finally,correctness of current ripple calculation is verified in MATLAB simulation.The method provides a theoretical basis for the choice of the optimal modulation strategy and filter inductance quantitative selection in practical engineering.
引文
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[2]王付胜,邵章平,刘萍,等.三电平逆变器电流纹波分析和LCL滤波器设计[J].电力电子技术,2010,44(11):36-38.WANG Fusheng,SHAO Zhangping,LIU Ping,et al.Analysis of current ripple of three-level grid connected converter and design of LCL filter[J].Power Electronics Technology,2010,44(11):36-38.(in Chinese)
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[8]陈娟,何英杰,王新宇,等.三电平空间矢量与载波调制策略统一理论的研究[J].中国电机工程报,2013,33(9):71-78.CHEN Juan,HE Yingjie,WANG Xinyu,et al.Research of the unity theory between three-level space vector and carrier-based PWM modulation strategy[J].Proceedings of the CSEE,2013,33(9):71-78.(in Chinese)
[9]OGASAWARA S,AKAGI H.Analysis of variation of neutral point potential in neutral-point-clamped voltage source PWM inverters[C]∥Proceedings of IEEE Industry Application Society Annual Meeting.Toronto,Canada:IEEE,1993:965-970.
[10]李宁,王跃,蒋应伟,等.三电平NPC变流器虚拟空间矢量调制策略与载波调制策略的内在关系研究[J].电网技术,2014(1):3768-3776.LI Ning,WANG Yue,JIANG Yingwei,et al.The internal relationship research of the virtual space vector modulation strategy and carrier modulation strategy[J].The Grid Technology,2014(1):3768-3776.(in Chinese)
[11]GRANDI G,LONCARSKI J.Analysis of peak-to-peak current ripple amplitude in seven-phase PWM voltage source inverters[J].Energies,2013,6(9):4429-4447.
[12]张兴,汪天呈,王付胜,等.基于矢量方法的两电平电压源逆变器纹波电流分析[C]∥中国电工技术学会电力电子学会第十四届学术年会论文集.福州:中国电工技术学会,2014:833-836.ZHANG Xing,WANG Tiancheng,WANG Fusheng,et al.Based on the vector method of two level voltage source inverter ripple current analysis[C]∥Power electronics society of China electrotechnical society,proceedings of the 14th annual seminar.Fuzhou:China Electrotechnical Society,2014:833-836.(in Chinese)
[13]俞年昌,杨家强.三电平APF的LCL滤波器设计和分析研究[J].机电工程,2014,31(5):624-628.YUE Nianchang,YANG Jiaqiang.Design and analysis of LCL filter of three-level APF[J].Proceedings of the CSEE,2014,31(5):624-628.(in Chinese)
[2]王付胜,邵章平,刘萍,等.三电平逆变器电流纹波分析和LCL滤波器设计[J].电力电子技术,2010,44(11):36-38.WANG Fusheng,SHAO Zhangping,LIU Ping,et al.Analysis of current ripple of three-level grid connected converter and design of LCL filter[J].Power Electronics Technology,2010,44(11):36-38.(in Chinese)
[3]GRANDI G,DORDEVIC O,LONCARSKI J.Analytical evaluation of output current ripple amplitude in three-phase three-level inverters[J].IET Power Electronics,2014,7(9):2258-2268.
[4]刘亚军.三电平逆变器SVPWM控制策略的研究[D].武汉:华中科技大学,2008.LIU Yajun.The research of the SVPWM control strategy[D].Wuhan:Huazhong University of Science and Technology,2008.(in Chinese)
[5]张兴,谢韦伟,王付胜,等.三电平断续脉宽调制策略的研究[J].电力电子技术,2013,47(10):4-6.ZHANG Xing,XIE Weiwei,WANG Fusheng,et al.Research on three-level discontinuous pulse width modulation strategy[J].Electric Power Electronics Technology,2013,47(10):4-6.(in Chinese)
[6]任康乐,张兴,王付胜,等.中压三电平并网逆变器断续脉宽调制策略及其输出滤波器优化设计[J].中国电机工程学报,2015,35(17):4494-4504.REN Kangle,ZHANG Xing,WANG Fusheng,et al.The design of the optimized design for the intermittent pulse width modulation strategy and the output filter of the three-level grid inverter[J].Proceedings of the CSEE,2015,35(17):4494-4504.(in Chinese)
[7]李宁,王跃,雷万钧,等.三电平NPC变流器SVPWM策略与SPWM策略的等效关系研究[J].电网技术,2014,38(5):1283-1290.LI Ning,WANG Yue,LEI Wanjun,et al.The equivalent relationship between SVPWM strategy and SPWMstrategy[J].The Grid Technology,2014,38(5):1283-1290.(in Chinese)
[8]陈娟,何英杰,王新宇,等.三电平空间矢量与载波调制策略统一理论的研究[J].中国电机工程报,2013,33(9):71-78.CHEN Juan,HE Yingjie,WANG Xinyu,et al.Research of the unity theory between three-level space vector and carrier-based PWM modulation strategy[J].Proceedings of the CSEE,2013,33(9):71-78.(in Chinese)
[9]OGASAWARA S,AKAGI H.Analysis of variation of neutral point potential in neutral-point-clamped voltage source PWM inverters[C]∥Proceedings of IEEE Industry Application Society Annual Meeting.Toronto,Canada:IEEE,1993:965-970.
[10]李宁,王跃,蒋应伟,等.三电平NPC变流器虚拟空间矢量调制策略与载波调制策略的内在关系研究[J].电网技术,2014(1):3768-3776.LI Ning,WANG Yue,JIANG Yingwei,et al.The internal relationship research of the virtual space vector modulation strategy and carrier modulation strategy[J].The Grid Technology,2014(1):3768-3776.(in Chinese)
[11]GRANDI G,LONCARSKI J.Analysis of peak-to-peak current ripple amplitude in seven-phase PWM voltage source inverters[J].Energies,2013,6(9):4429-4447.
[12]张兴,汪天呈,王付胜,等.基于矢量方法的两电平电压源逆变器纹波电流分析[C]∥中国电工技术学会电力电子学会第十四届学术年会论文集.福州:中国电工技术学会,2014:833-836.ZHANG Xing,WANG Tiancheng,WANG Fusheng,et al.Based on the vector method of two level voltage source inverter ripple current analysis[C]∥Power electronics society of China electrotechnical society,proceedings of the 14th annual seminar.Fuzhou:China Electrotechnical Society,2014:833-836.(in Chinese)
[13]俞年昌,杨家强.三电平APF的LCL滤波器设计和分析研究[J].机电工程,2014,31(5):624-628.YUE Nianchang,YANG Jiaqiang.Design and analysis of LCL filter of three-level APF[J].Proceedings of the CSEE,2014,31(5):624-628.(in Chinese)