基于直流侧无源电压谐波注入法的串联型24脉波整流器
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摘要
为抑制串联型多脉波整流器的输入电流谐波,提出一种直流侧电压谐波注入法。该方法通过谐波注入电路产生6倍电网电压频率的电压谐波,并通过谐波注入变压器注入串联型多脉波整流器的直流侧,使整流器输入电流的波形近似为正弦;借助开关函数法,分析移相变压器输入电压24阶梯波的形成过程;从移相变压器输入电压总谐波畸变率(THD)值最小角度出发,设计注入变压器的最佳匝比。仿真和实验结果表明,使用谐波注入电路后,整流器的输入功率因数由97.43%提高到98.94%,电能质量得到明显提高;移相变压器的输入电压由12阶梯波变为24阶梯波,其THD值由9.74%降到3.34%,输入电流THD值由7.62%降到2.65%,整流器的谐波抑制性能得到显著提升。
In order to suppress the input current harmonics of multi-pulse rectifier, this paper proposes a voltage harmonic injection method at DC side for series-connected 12-pulse rectifier. The proposed method uses harmonic injection circuit to generate voltage harmonic, which has six times the supply frequency, so that the waveform of the input current is approximately sinusoidal. With the help of the switching function method, the formation process of the 24 step wave input voltage of isolation transformer is analyzed. The optimum turn ratio of injection transformer is designed based on the lowest THD of the input voltage of isolation transformer. Simulation and experimental results show that,after using the harmonic injection circuit, the input power factor of the rectifier is increased from97.43% to 98.94%, thus the power quality has been improved significantly, the input voltage of isolation transformer is changed from 12 step wave to 24 step wave, its THD drops from 9.74% to3.34%, and the THD of input current drops from 7.62% to 2.65%, the harmonic suppression performance of the rectifier has been significantly improved.
In order to suppress the input current harmonics of multi-pulse rectifier, this paper proposes a voltage harmonic injection method at DC side for series-connected 12-pulse rectifier. The proposed method uses harmonic injection circuit to generate voltage harmonic, which has six times the supply frequency, so that the waveform of the input current is approximately sinusoidal. With the help of the switching function method, the formation process of the 24 step wave input voltage of isolation transformer is analyzed. The optimum turn ratio of injection transformer is designed based on the lowest THD of the input voltage of isolation transformer. Simulation and experimental results show that,after using the harmonic injection circuit, the input power factor of the rectifier is increased from97.43% to 98.94%, thus the power quality has been improved significantly, the input voltage of isolation transformer is changed from 12 step wave to 24 step wave, its THD drops from 9.74% to3.34%, and the THD of input current drops from 7.62% to 2.65%, the harmonic suppression performance of the rectifier has been significantly improved.
引文
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[10]宋玉美,游小杰,孙倩倩,等.基于自耦变压器的多电平注入式电流源型变换器[J].电工技术学报,2014,29(增刊1):308-313.Song Yumei,You Xiaojie,Sun Qianqian,et al.Multilevel reinjection current source converter based on autotransformer[J].Transactions of China Electrotechnical Society,2014,29(S1):308-313.
[11]孟凡刚,骆霁嵘,高蕾,等.基于直流侧有源谐波抑制方法的高功率密度多脉波整流器[J].电工技术学报,2017,32(19):134-140.Meng Fangang,Luo Jirong,Gao Lei,et al.A high power density multi-pulse rectifier based on harmonic reduction technology at DC link[J].Transactions of China Electrotechnical Society,2017,32(19):134-140.
[12]Singh B,Bhuvaneswari G,Garg V.An improved power-quality 30-pulse AC-DC for varying loads[J].IEEE Transactions on Power Delivery,2007,22(2):1179-1187.
[13]Singh B,Bhuvaneswari G,Garg V.Harmonic mitigation using 12-pulse AC-DC converter in vectorcontrolled induction motor drives[J].IEEE Transactions on Power Delivery,2006,21(3):1483-1492.
[14]Kalpana R,Bhuvaneswari G,Singh B,et al Autoconnected-transformer-based 20-pulse AC-DCconverter for telecommunication power supply[J].IEEE Transactions on Industrial Electronics,201360(10):4178-4190.
[15]Choi S,Enjeti P N,Lee H,et al.A new active interphase reactor for 12-pulse rectifiers provides clean power utility interface[J].IEEE Transactions on Industry Applications,1996,32(6):1304-1311.
[16]Meng Fangang,Yang Wei,Zhu Yi,et al.Load adaptability of active harmonic reduction for12-pulse diode bridge rectifier with active interphase reactor[J].IEEE Transactions on Power Electronics,2015,30(12):7170-7180.
[17]Fukuda S,Ohta M,Iwaji Y.An auxiliary-supplyassisted harmonic reduction scheme for 12-pulse diode rectifiers[J].IEEE Transactions on Power Electronics,2008,23(3):1270-1277.
[2]Chivite-Zabalza F J,Forsyth A J,Trainer D R.Analysis and practical evaluation of an 18-pulse rectifier for aerospace applications[C]//Second International Conference on Power Electronics,Machines and Drives,Edinburgh,UK,2004:338-343.
[3]Chivite-Zabalza F J,Forsyth A J,Trainer D R.Asimple,passive 24-pulse AC-DC converter with inherent load balancing[J].IEEE Transactions on Power Electronics,2006,21(2):430-439.
[4]孙盼,赵镜红,熊欣,等.用于多脉波整流的直线式移相变压器[J].电工技术学报,2017,32(增刊1):169-176.Sun Pan,Zhao Jinghong,Xiong Xin,et al.A linearshaped phase-shift transformer applied in multi-pulse rectifier[J].Transactions of China Electrotechnical Society,2017,32(S1):169-176.
[5]王铁军,方芳,姜晓弋,等.圆形变压器在24脉波整流系统中的应用[J].电工技术学报,2016,31(13):173-179.Wang Tiejun,Fang Fang,Jiang Xiaoyi,et al.Application of round-shaped transformer in 24 pulses rectifier system[J].Transactions of China Electrotechnical Society,2016,31(13):173-179.
[6]April G E,Olivier G.A novel type of 12-pulse converter[J].IEEE Transactions on Industry Applications,1985,21(1):180-191.
[7]Rendusara D A,Jouanne A V,Enjeti P N,et al.Design considerations for 12-pulse diode rectifier systems operating under voltage unbalance and preexisting voltage distortion with some corrective measures[J].IEEE Transactions on Industry Applications,1996,32(6):1293-1303.
[8]Fernandes R C,Oliveira P d S,Seixas F J M d.Afamily of autoconnected transformers for 12-and18-pulse converters-generalization for delta and wye topologies[J].IEEE Transactions on Power Electronics,2011,26(7):2065-2078.
[9]孟凡刚,徐晓娜,高蕾.一种使用无源谐波抑制方法的多脉波整流器[J].电工技术学报,2017,32(增刊2):77-85.Meng Fangang,Xu Xiaona,Gao Lei.A harmonic reduction method in multi-pulse rectifier using passive devices[J].Transactions of China Electrotechnical Society,2017,32(S2):77-85.
[10]宋玉美,游小杰,孙倩倩,等.基于自耦变压器的多电平注入式电流源型变换器[J].电工技术学报,2014,29(增刊1):308-313.Song Yumei,You Xiaojie,Sun Qianqian,et al.Multilevel reinjection current source converter based on autotransformer[J].Transactions of China Electrotechnical Society,2014,29(S1):308-313.
[11]孟凡刚,骆霁嵘,高蕾,等.基于直流侧有源谐波抑制方法的高功率密度多脉波整流器[J].电工技术学报,2017,32(19):134-140.Meng Fangang,Luo Jirong,Gao Lei,et al.A high power density multi-pulse rectifier based on harmonic reduction technology at DC link[J].Transactions of China Electrotechnical Society,2017,32(19):134-140.
[12]Singh B,Bhuvaneswari G,Garg V.An improved power-quality 30-pulse AC-DC for varying loads[J].IEEE Transactions on Power Delivery,2007,22(2):1179-1187.
[13]Singh B,Bhuvaneswari G,Garg V.Harmonic mitigation using 12-pulse AC-DC converter in vectorcontrolled induction motor drives[J].IEEE Transactions on Power Delivery,2006,21(3):1483-1492.
[14]Kalpana R,Bhuvaneswari G,Singh B,et al Autoconnected-transformer-based 20-pulse AC-DCconverter for telecommunication power supply[J].IEEE Transactions on Industrial Electronics,201360(10):4178-4190.
[15]Choi S,Enjeti P N,Lee H,et al.A new active interphase reactor for 12-pulse rectifiers provides clean power utility interface[J].IEEE Transactions on Industry Applications,1996,32(6):1304-1311.
[16]Meng Fangang,Yang Wei,Zhu Yi,et al.Load adaptability of active harmonic reduction for12-pulse diode bridge rectifier with active interphase reactor[J].IEEE Transactions on Power Electronics,2015,30(12):7170-7180.
[17]Fukuda S,Ohta M,Iwaji Y.An auxiliary-supplyassisted harmonic reduction scheme for 12-pulse diode rectifiers[J].IEEE Transactions on Power Electronics,2008,23(3):1270-1277.