多脉波整流器直流侧无源谐波抑制机理研究
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摘要
为提高多脉波整流器的直流侧无源谐波抑制能力,研究了基于两抽头变换器的24脉波整流器直流侧谐波抑制机理。根据抽头变换器的结构及安匝平衡原理,分析了抽头变换器的功能及工作模式,研究了抽头变换器的工作模式对整流桥输出电流、整流器输入电流及负载电压的影响,给出了抽头变换器变比的理论最优值。理论分析及实验结果表明,抽头变换器的端电压会使其所接的两个二极管交替导通,对整流桥输出电流进行调制,进而产生环流,该环流流经交流侧时会抵消原输入电流中的12k±1(k为奇数)次谐波。另外,抽头变换器所接的两个二极管的交替导通,会在负载上产生附加电压,附加电压的存在可以显著降低负载电压的纹波系数。相应的实验结果验证了理论分析的正确性。
In order to improve the ability of harmonic reduction at DC link of multi-pulse rectifier( MPR),the harmonic reduction mechanism at DC link of 24-pulse rectifier with double-tapped interphase reactor( IPR) was analyzed. According to the winding configuration of double-tapped IPR and Ampere-Turn balance,the function and operation mode of double-tapped IPR were analyzed. The effect of operation mode on output currents of the two bridge rectifiers,input current of rectifiers,load voltage were also analyzed,and the theoretical value of turn ratio of IPR was calculated. Theoretical analysis and experimental results show that the conduction in turn of the two diodes connected with IPR will produce a circulating current to modulate the output currents of the bridge rectifiers. When the circulating current flows through the input mains,it reduces the( 12 k ± 1)th( k is odd number) harmonics. In addition,conduction in turn of the two diodes produces an additional voltage on the load voltage,which depresses the ripple coefficient of load voltage. Experimental results validate the correctness of theoretical analysis.
In order to improve the ability of harmonic reduction at DC link of multi-pulse rectifier( MPR),the harmonic reduction mechanism at DC link of 24-pulse rectifier with double-tapped interphase reactor( IPR) was analyzed. According to the winding configuration of double-tapped IPR and Ampere-Turn balance,the function and operation mode of double-tapped IPR were analyzed. The effect of operation mode on output currents of the two bridge rectifiers,input current of rectifiers,load voltage were also analyzed,and the theoretical value of turn ratio of IPR was calculated. Theoretical analysis and experimental results show that the conduction in turn of the two diodes connected with IPR will produce a circulating current to modulate the output currents of the bridge rectifiers. When the circulating current flows through the input mains,it reduces the( 12 k ± 1)th( k is odd number) harmonics. In addition,conduction in turn of the two diodes produces an additional voltage on the load voltage,which depresses the ripple coefficient of load voltage. Experimental results validate the correctness of theoretical analysis.
引文
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[3]周宏林,杨耕.用于大型DFIG风电场的混合型HVDC系统中整流器的建模与控制[J].电工技术学报,2012,27(4):224-232.ZHOU Honglin,YANG Geng.Modeling and control for rectifier in the hybrid-HVDC system for DFIG-based wind farm[J].Transactions of China Electrotechnical Society,2012,27(4):224-232.
[4]RODOLFO Castanho Fernandes,PRISCILA da Silva Oliveira,FALCONDES Jos'e Mendes de Seixas.A family of autoconnected transformers for 12-and 18-pulse converters-generalization for delta and wye topologies[J].IEEE Transactions on Power Electronics,2011,26(7):2065-2078.
[5]KALPANA R,BHUVANESWARI G,SINGH Bhim.Autoconnected-transformer-based 20-pulse AC-DC converter for telecommunication power supply[J].IEEE Transactions on Industrial Electronics,2013,60(10):4178-4190.
[6]SINGHB,GARG V,and BHUVANESWARI G.A novel T-connected autotransformer-based 18-pulse AC–DC converter for harmonic mitigation in adjustable-speed induction-motor drives[J].IEEE Transactions on Industrial Electronics,2007,54(5):2500-2511.
[7]张鹏真,陈乾宏,毛浪.一种18脉冲隔离型变压整流器[J].南京航空航天大学学报,2014,46(1):129-136.ZHANG Pengzhen,CHEN Qianhong,MAO Lang.A type 18-pulse isolation transformer[J].Journal of Nanjing University of Aeronautics&Astronautics,2014,46(1):129-136.
[8]PAN Qijun,MA Weiming,LIU Dezhi,et al.A new critical formula and mathematical model of double-tap interphase reactor in a sixphase tap-changer diode rectifier[J].IEEE Transactions on Industrial Electronics,2007,54(1):479-485.
[9]MENG Fangang,YANG Shiyan,YANG Wei.Modeling for a multitap interphase reactor in a multipulse diode bridge rectifier[J].IEEE Transactions on Power Electronics,2009,24(9):2171-2177.
[10]孟凡刚,杨世彦,杨威.多脉波整流技术综述[J].电力自动化设备,2012,32(2):9-22.MENG Fangang,YANG Shiyan,YANG Wei.Overview of multipulse rectifier technique[J].Electric Power Automation Equipment,2012,32(2):9-22.
[11]NGUYEN Thanh Hai,LEE Dong-Choon,KIM Chan-Ki.A SeriesConnected Topology of a Diode Rectifier and a Voltage-Source Converter for an HVDC Transmission System[J].IEEE Transactions on Power Electronics,2014,29(4):1579-1584.
[12]张洋,吴旖.用于船舶综合电力推进的同步发电机电磁设计[J].电工技术学报,2013,28(10):67-74.ZHANG Yang,WU Ni.Design of synchronous generator for integrated power propulsion system in marine[J].Transactions of China Electrotechnical Society,2013,28(10):67-74.
[13]PAICED A,Power Electronic Converter Harmonic Multipulse Methods for Clean Power[M].New York:IEEE Press,1996.