一种全范围内中点电压平衡的中点钳位型三电平变换器的扩展非连续脉宽调制策略
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摘要
在中点钳位型三电平变换器(neutralpointclamped three-levelconverter,NPCTLC)中,非连续脉宽调制方法(discontinuous pulse width modulation,DPWM)可有效降低开关损耗,但在中点电压平衡控制上存在不足。提出一种由传统DPWM模式(convention DPWM mode,C_MODE)和扩展DPWM模式(extended DPWM mode,E_MODE)组合的混合调制策略,称之为扩展的非连续脉宽调制方法(extended discontinuous pulse width modulation,EDPWM)。C_MODE和E_MODE在控制中点电压平衡方面具有很好的互补性。EDPWM可在全调制度全功率因数范围内实现中点电压平衡。由于C_MODE和E_MODE在一个开关周期内的开关次数分别为2次和3次,使得EDPWM在很好地控制中点电压的前提下,能兼顾开关损耗。对多种调制策略在开关损耗及中点电压控制能力等方面进行对比;通过实验验证EDPWM的可行性和优越性。
In the neutral point clamped three level converter(NPC TLC), the discontinuous modulation method can effectively reduce the switching loss, but it has some shortcomings in the neutral point voltage(NPV) balancing control. So a hybrid modulation strategy of convention discontinuous pulse width modulation(DPWM) mode(C_MODE) and extended DPWM mode(E_MODE) was proposed, which is EDPWM. C_MODE and E_MODE have good complementarity in the control of NPV balancing.EDPWM modulation strategy can maintain the NPV balance under the full range of modulation index(MI) and power factor(PF). And because the switching actions of C_MODE and E_MODE in one switching cycle are twice and three times,respectively, EDPWM can reduce switching loss on the premise of good control of neutral point voltage. A variety of modulation strategies were compared in terms of switching loss and NPV capability. Finally, the feasibility and superiority of EDPWM were verified by experiments.
In the neutral point clamped three level converter(NPC TLC), the discontinuous modulation method can effectively reduce the switching loss, but it has some shortcomings in the neutral point voltage(NPV) balancing control. So a hybrid modulation strategy of convention discontinuous pulse width modulation(DPWM) mode(C_MODE) and extended DPWM mode(E_MODE) was proposed, which is EDPWM. C_MODE and E_MODE have good complementarity in the control of NPV balancing.EDPWM modulation strategy can maintain the NPV balance under the full range of modulation index(MI) and power factor(PF). And because the switching actions of C_MODE and E_MODE in one switching cycle are twice and three times,respectively, EDPWM can reduce switching loss on the premise of good control of neutral point voltage. A variety of modulation strategies were compared in terms of switching loss and NPV capability. Finally, the feasibility and superiority of EDPWM were verified by experiments.
引文
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[17]Hu Cungang,Yu Xinghuo,Holmes D G,et al.An improved virtual space vector modulation scheme for three-level active neutral-point-clamped inverter[J].IEEETransactions on Power Electronics,2017,32(10):7419-7434.
[18]Liu Peng,Duan Shanxu,Yao Chuan,et al.A double modulation wave CBPWM strategy providing neutral-point voltage oscillation elimination and CMV reduction for three-level NPC inverters[J].IEEE Transactions on Industrial Electronics,2018,65(1):16-26.
[19]Wang Jinping,Gao Yan,Jiang Weidong.A carrier-based implementation of virtual space vector modulation for neutral-point-clamped three-level inverter[J].IEEETransactions on Industrial Electronics,2017,64(12):9580-9586.
[20]Giri S K,Chakrabarti S,Banerjee S,et al.A carrier-based PWM scheme for neutral point voltage balancing in three-level inverter extending to full power factor range[J].IEEE Transactions on Industrial Electronics,2017,64(3):1873-1883.
[21]Busquets-Monge S,Bordonau J,Rocabert J.Avirtual-vector pulsewidth modulation for the four-level diode-clamped DC-AC converter[J].IEEE Transactions on Power Electronics,2008,23(4):1964-1972.
[22]姜卫东,王群京,陈权,等.二极管箝位型多电平逆变器全范围电容电压平衡的PWM调制方法[J].中国电机工程学报,2009,29(15):28-35.Jiang Weidong,Wang Qunjing,Chen Quan,et al.PWMalgorithm for diode clamped multi-level voltage source inverter with capacitor voltage balance under full condition[J].Proceedings of the CSEE,2009,29(15):28-35(in Chinese).
[2]Mai T D,Van den Broeck G,Pevere A,et al.Power electronics for potential distribution dc power evolution:Areview[C]//2016 IEEE International Energy Conference(ENERGYCON).Leuven,Belgium:IEEE,2016:1-6.
[3]Barater D,Concari C,Buticchi G,et al.Performance evaluation of a three-level ANPC photovoltaic grid-connected inverter with 650V sic devices and optimized PWM[J].IEEE Transactions on Industry Applications,2016,52(3):2475-2485.
[4]Sommer R,Mertens A,Brunotte C,et al.Medium voltage drive system with NPC three-level inverter using IGBTs[C]//IEE Seminar PWM Medium Voltage Drives.Birmingham,UK:IEEE,2000:3/1-3/5.
[5]吴洪洋,何湘宁.多电平载波PWM法与SVPWM法之间的本质联系及其应用[J].中国电机工程学报,2002,22(5):10-15.Wu Hongyang,He Xiangning.Relationship between multilevel carrier-based PWM and SVPWM and its applications[J].Proceedings of the CSEE,2002,22(5):10-15(in Chinese).
[6]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].中国电机工程学报,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).
[7]Wang Zhiqiang,Cui Fuyao,Zhang Guozheng,et al.Novel carrier-based PWM strategy with zero-sequence voltage injected for three-level NPC inverter[J].IEEE Journal of Emerging and Selected Topics in Power Electronics,2016,4(4):1442-1451.
[8]Pou J,Zaragoza J,Ceballos S,et al.A carrier-based PWMstrategy with zero-sequence voltage injection for a three-level neutral-point-clamped converter[J].IEEETransactions on Power Electronics,2012,27(2):642-651.
[9]宋文祥,陈国呈,束满堂,等.中点箝位式三电平逆变器空间矢量调制及其中点控制研究[J].中国电机工程学报,2006,26(5):105-109.Song Wenxiang,Chen Guocheng,Shu Mantang,et al.Research on SVPWM method and its neutral-pointpotential control for three-level neutral-point-clamped(NPC)inverter[J].Proceedings of the CSEE,2006,26(5):106-109(in Chinese).
[10]姜卫东,王群京,史晓锋,等.中点箝位型三电平逆变器在空间矢量调制时中点电位的低频振荡[J].中国电机工程学报,2009,29(3):49-55.Jiang Weidong,Wang Qunjing,Shi Xiaofeng,et al.Low frequency oscillation of neutral point voltage of neutral-point-clamped three-level VSI under SVPWMcontrol[J].Proceedings of the CSEE,2009,29(3):49-55(in Chinese).
[11]Lee J S,Yoo S,Lee K B.Novel discontinuous PWMmethod of a three-level inverter for neutral-point voltage ripple reduction[J].IEEE Transactions on Industrial Electronics,2016,63(6):3344-3354.
[12]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.
[13]Busquets-Monge S,Bordonau J,Boroyevich D,et al.The nearest three virtual space vector PWM-a modulation for the comprehensive neutral-point balancing in the three-level NPC inverter[J].IEEE Power Electronics Letters,2004,2(1):11-15.
[14]姜卫东,杜少武,史晓锋,等.中点箝位型三电平逆变器空间矢量与虚拟空间矢量的混合调制方法[J].中国电机工程学报,2009,29(18):47-53.Jiang Weidong,Du Shaowu,Shi Xiaofeng,et al.Hybrid PWM strategy of SVPWM and VSVPWM for neutral point-clamped three-level voltage source inverter[J].Proceedings of the CSEE,2009,29(18):47-53(in Chinese).
[15]Xia Changliang,Shao Hongjun,Zhang Yun,et al.Adjustable proportional hybrid SVPWM strategy for neutral-point-clamped three-level inverters[J].IEEETransactions on Industrial Electronics,2013,60(10):4234-4242.
[16]Wu Xiang,Tan Guojun,Ye Zongbin,et al.Virtualspace-vector PWM for a three-level neutral-pointclamped inverter with unbalanced DC-links[J].IEEETransactions on Power Electronics,2018,33(3):2630-2642.
[17]Hu Cungang,Yu Xinghuo,Holmes D G,et al.An improved virtual space vector modulation scheme for three-level active neutral-point-clamped inverter[J].IEEETransactions on Power Electronics,2017,32(10):7419-7434.
[18]Liu Peng,Duan Shanxu,Yao Chuan,et al.A double modulation wave CBPWM strategy providing neutral-point voltage oscillation elimination and CMV reduction for three-level NPC inverters[J].IEEE Transactions on Industrial Electronics,2018,65(1):16-26.
[19]Wang Jinping,Gao Yan,Jiang Weidong.A carrier-based implementation of virtual space vector modulation for neutral-point-clamped three-level inverter[J].IEEETransactions on Industrial Electronics,2017,64(12):9580-9586.
[20]Giri S K,Chakrabarti S,Banerjee S,et al.A carrier-based PWM scheme for neutral point voltage balancing in three-level inverter extending to full power factor range[J].IEEE Transactions on Industrial Electronics,2017,64(3):1873-1883.
[21]Busquets-Monge S,Bordonau J,Rocabert J.Avirtual-vector pulsewidth modulation for the four-level diode-clamped DC-AC converter[J].IEEE Transactions on Power Electronics,2008,23(4):1964-1972.
[22]姜卫东,王群京,陈权,等.二极管箝位型多电平逆变器全范围电容电压平衡的PWM调制方法[J].中国电机工程学报,2009,29(15):28-35.Jiang Weidong,Wang Qunjing,Chen Quan,et al.PWMalgorithm for diode clamped multi-level voltage source inverter with capacitor voltage balance under full condition[J].Proceedings of the CSEE,2009,29(15):28-35(in Chinese).
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