基于动态空间矢量的三电平逆变器不连续调制策略
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摘要
针对不连续调制策略下二极管钳位式三电平逆变器中点电位波动难以抑制的问题,提出一种动态空间矢量不连续调制策略。该策略通过实时检测逆变器上下电容电压,生成动态空间矢量,进而精确合成参考矢量,有效降低中点电位波动带来的输出波形畸变。采用基于gh坐标系及奇偶扇区转换的方法,避免空间矢量动态化带来的调制算法复杂度问题。为消除中点电位偏移,提出实时切换对中点电位具有相反作用的开关矢量序列的方法。最后给出基于误差电流矢量的调制策略评价方法,从理论上验证了所提的动态空间矢量调制的优势。仿真和实验结果进一步验证了本文所提方法的有效性。
Since the neutral point potential fluctuation of three-level inverter is difficult to suppress under discontinuous modulation strategy,a dynamic space vector strategy was proposed.This strategy could generate a dynamic space vector by real-time detecting the upper and lower capacitor voltages,and then accurately synthesize the reference vector.This paper adopted gh coordinate system and parity sector conversion method to reduce the complexity of the dynamics algorithm.In order to eliminate the neutral point potential offset,this paper also proposed a method of switching vector sequence with reverse effect on the neutral point potential in real time.Finally,the evaluation method of modulation strategy based on the error current vector was given,which verified the advantages of the dynamic space vector modulation.Simulation and experimental results further show the effectiveness of the proposed method.
Since the neutral point potential fluctuation of three-level inverter is difficult to suppress under discontinuous modulation strategy,a dynamic space vector strategy was proposed.This strategy could generate a dynamic space vector by real-time detecting the upper and lower capacitor voltages,and then accurately synthesize the reference vector.This paper adopted gh coordinate system and parity sector conversion method to reduce the complexity of the dynamics algorithm.In order to eliminate the neutral point potential offset,this paper also proposed a method of switching vector sequence with reverse effect on the neutral point potential in real time.Finally,the evaluation method of modulation strategy based on the error current vector was given,which verified the advantages of the dynamic space vector modulation.Simulation and experimental results further show the effectiveness of the proposed method.
引文
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[2]陈权,王群京,姜卫东,等.二极管钳位型三电平变换器开关损耗分析[J].电工技术学报,2008,23(2):68-75.Chen Quan,Wang Qunjing,Jiang Weidong,et al.Analysis of switching losses in diode-clamped three-level converter[J].Transactions of China Electrotechnical Society,2008,23(2):68-75.
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[4]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.
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[6]An S L,Sun X D,Zhang Q,et al.Study on the novel generalized discontinuous SVPWM strategies for three-phase voltage source inverters[J].IEEE Transactions on Industrial Informatics,2013,9(2):781-789.
[7]Chen Wei,Sun Haiwei,Gu Xin,et al.Synchronized space-vector PWM for three-level VSI with lower harmonic distortion and switching frequency[J].IEEE Transactions on Power Electronics,2016,31(9):6428-6441.
[8]姜卫东,赵德勇,汪磊,等.一种以降低逆变器开关损耗为目标并考虑中点电位平衡的适用于中点钳位式三电平逆变器的调制方法[J].中国电机工程学报,2016,36(5):1376-1386.Jiang Weidong,Zhao Deyong,Wang Lei,et al.Amodulation method with reduced switching losses and considering the neutral point voltage balance suitable for the neutral point clamped three-level inverter[J].Proceedings of the CSEE,2016,36(5):1376-1386.
[9]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.Optimized design of discontinuous pulse-width modulation and output filter for medium-voltage three-level grid-connected inverter[J].Proceedings of the CSEE,2015,35(17):4494-4504.
[10]杨晓冬,王崇林,史丽萍,等.级联型逆变器的统一SVPWM方法[J].电工技术学报,2014,29(6):145-152.Yang Xiaodong,Wang Chonglin,Shi Liping,et al.Generalized space vector PWM method for cascaded multilevel inverters[J].Transactions of China Electrotechnical Society,2014,29(6):145-152.
[11]王兆宇,艾芊.三电平逆变器空间矢量调制及中点电压控制[J].电力系统保护与控制,2011,39(20):131-136.Wang Zhaoyu,Ai Qian.Space vector modulation for three-level inverter and neutral point potential control[J].Power System Protection and Control,2011,39(20):131-136.
[12]郭利辉.T型三电平逆变器无差拍电流预测和中点平衡控制方法[J].电力系统保护与控制,2016,44(18):127-132.Guo Lihui.Deadbeat predictive current and neutral voltage balancing control method parallel three-level T-type inverters[J].Power System Protection and Control,2016,44(18):127-132.
[13]Choi U M,Lee H H,Lee K B.Simple neutral-point voltage control for three-level inverters using a discontinuous pulse width modulation[J].IEEETransactions on Energy Conversion,2013,28(2):434-443.
[14]刘斌,黄凯伦,伍家驹,等.一种具有中点电位平衡可降低损耗的三电平空间矢量调制方法[J].电工技术学报,2015,30(4):196-202.Liu Bin,Huang Kailun,Wu Jiaju,et al.A novel SVPWM method considering neutral-point potential balancing and reducing switching losses for threelevel inverter[J].Transactions of China Electrotechnical Society,2015,30(4):196-202.
[15]孙青松,吴学智,唐芬.考虑中点电位平衡的三电平逆变器断续脉宽调制策略研究[J].中国电机工程学报,2017,37(增刊1):177-185.Sun Qingsong,Wu Xuezhi,Tang Fen.Three-level inverter discontinuous pulse-width modulation strategy considering neutral point potential balance[J].Proceedings of the CSEE,2017,37(S1):177-185.
[16]胡存刚,王群京,李国丽,等.基于虚拟空间矢量的三电平NPC逆变器中点电压平衡控制方法[J].电工技术学报,2009,24(5):100-107.Hu Cungang,Wang Qunjing,Li Guoli,et al.Aneutral-point potential balancing algorithm for three-level inverter based on virtual space vector[J].Transactions of China Electrotechnical Society,2009,24(5):100-107.
[17]Jiao Y,Lee F C,Lu S Z.Space vector modulation for three-level NPC converter with neutral point voltage balance and switching loss reduction[J].IEEETransactions on Power Electronics,2014,29(10):5579-5591.
[18]吴可丽,夏长亮,张云,等.二极管钳位型三电平逆变器共模电压抑制[J].电工技术学报,2015,30(24):110-117,170.Wu Keli,Xia Changliang,Zhang Yun,et al.Common-mode voltage suppression for neutral point clamped three-level inverter[J].Transactions of China Electrotechnical Society,2015,30(24):110-117,170.
[19]王志强,邓臣臣,谷鑫,等.基于中点钳位型三电平逆变器的改进型虚拟空间矢量调制策略[J].电工技术学报,2017,32(18):230-238.Wang Zhiqiang,Deng Chenchen,Gu Xin,et al.The improved virtual space vector modulation strategy based on neutral-point-clamped three level inverter[J].Transactions of China Electrotechnical Society,2017,32(18):230-238.
[20]Xia Changliang,Zhang Guozheng,Yan Yan,et al.Discontinuous space vector PWM strategy of neutral point clamped three level inverters for output current ripple reduction[J].IEEE Transactions on Power Electronics,2017,32(7):5109-5121.
[2]陈权,王群京,姜卫东,等.二极管钳位型三电平变换器开关损耗分析[J].电工技术学报,2008,23(2):68-75.Chen Quan,Wang Qunjing,Jiang Weidong,et al.Analysis of switching losses in diode-clamped three-level converter[J].Transactions of China Electrotechnical Society,2008,23(2):68-75.
[3]胡存刚,马大俊,王群京,等.三电平有源中点钳位逆变器损耗分布平衡控制策略[J].电工技术学报,2017,32(1):129-138.Hu Cungang,Ma Dajun,Wang Qunjing,et al.Control strategy of loss distribution balancing for three-level active neutral point clamped inverter[J].Transactions of China Electrotechnical Society,2017,32(1):129-138.
[4]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.
[5]Dalessandro L,Round S D,Drofenik U,et al.Discontinuous space-vector modulation for threelevel PWM rectifiers[J].IEEE Transactions on Power Electronics,2008,23(2):530-542.
[6]An S L,Sun X D,Zhang Q,et al.Study on the novel generalized discontinuous SVPWM strategies for three-phase voltage source inverters[J].IEEE Transactions on Industrial Informatics,2013,9(2):781-789.
[7]Chen Wei,Sun Haiwei,Gu Xin,et al.Synchronized space-vector PWM for three-level VSI with lower harmonic distortion and switching frequency[J].IEEE Transactions on Power Electronics,2016,31(9):6428-6441.
[8]姜卫东,赵德勇,汪磊,等.一种以降低逆变器开关损耗为目标并考虑中点电位平衡的适用于中点钳位式三电平逆变器的调制方法[J].中国电机工程学报,2016,36(5):1376-1386.Jiang Weidong,Zhao Deyong,Wang Lei,et al.Amodulation method with reduced switching losses and considering the neutral point voltage balance suitable for the neutral point clamped three-level inverter[J].Proceedings of the CSEE,2016,36(5):1376-1386.
[9]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.Optimized design of discontinuous pulse-width modulation and output filter for medium-voltage three-level grid-connected inverter[J].Proceedings of the CSEE,2015,35(17):4494-4504.
[10]杨晓冬,王崇林,史丽萍,等.级联型逆变器的统一SVPWM方法[J].电工技术学报,2014,29(6):145-152.Yang Xiaodong,Wang Chonglin,Shi Liping,et al.Generalized space vector PWM method for cascaded multilevel inverters[J].Transactions of China Electrotechnical Society,2014,29(6):145-152.
[11]王兆宇,艾芊.三电平逆变器空间矢量调制及中点电压控制[J].电力系统保护与控制,2011,39(20):131-136.Wang Zhaoyu,Ai Qian.Space vector modulation for three-level inverter and neutral point potential control[J].Power System Protection and Control,2011,39(20):131-136.
[12]郭利辉.T型三电平逆变器无差拍电流预测和中点平衡控制方法[J].电力系统保护与控制,2016,44(18):127-132.Guo Lihui.Deadbeat predictive current and neutral voltage balancing control method parallel three-level T-type inverters[J].Power System Protection and Control,2016,44(18):127-132.
[13]Choi U M,Lee H H,Lee K B.Simple neutral-point voltage control for three-level inverters using a discontinuous pulse width modulation[J].IEEETransactions on Energy Conversion,2013,28(2):434-443.
[14]刘斌,黄凯伦,伍家驹,等.一种具有中点电位平衡可降低损耗的三电平空间矢量调制方法[J].电工技术学报,2015,30(4):196-202.Liu Bin,Huang Kailun,Wu Jiaju,et al.A novel SVPWM method considering neutral-point potential balancing and reducing switching losses for threelevel inverter[J].Transactions of China Electrotechnical Society,2015,30(4):196-202.
[15]孙青松,吴学智,唐芬.考虑中点电位平衡的三电平逆变器断续脉宽调制策略研究[J].中国电机工程学报,2017,37(增刊1):177-185.Sun Qingsong,Wu Xuezhi,Tang Fen.Three-level inverter discontinuous pulse-width modulation strategy considering neutral point potential balance[J].Proceedings of the CSEE,2017,37(S1):177-185.
[16]胡存刚,王群京,李国丽,等.基于虚拟空间矢量的三电平NPC逆变器中点电压平衡控制方法[J].电工技术学报,2009,24(5):100-107.Hu Cungang,Wang Qunjing,Li Guoli,et al.Aneutral-point potential balancing algorithm for three-level inverter based on virtual space vector[J].Transactions of China Electrotechnical Society,2009,24(5):100-107.
[17]Jiao Y,Lee F C,Lu S Z.Space vector modulation for three-level NPC converter with neutral point voltage balance and switching loss reduction[J].IEEETransactions on Power Electronics,2014,29(10):5579-5591.
[18]吴可丽,夏长亮,张云,等.二极管钳位型三电平逆变器共模电压抑制[J].电工技术学报,2015,30(24):110-117,170.Wu Keli,Xia Changliang,Zhang Yun,et al.Common-mode voltage suppression for neutral point clamped three-level inverter[J].Transactions of China Electrotechnical Society,2015,30(24):110-117,170.
[19]王志强,邓臣臣,谷鑫,等.基于中点钳位型三电平逆变器的改进型虚拟空间矢量调制策略[J].电工技术学报,2017,32(18):230-238.Wang Zhiqiang,Deng Chenchen,Gu Xin,et al.The improved virtual space vector modulation strategy based on neutral-point-clamped three level inverter[J].Transactions of China Electrotechnical Society,2017,32(18):230-238.
[20]Xia Changliang,Zhang Guozheng,Yan Yan,et al.Discontinuous space vector PWM strategy of neutral point clamped three level inverters for output current ripple reduction[J].IEEE Transactions on Power Electronics,2017,32(7):5109-5121.