基于级联H桥变流器的牵引网谐波阻抗测量装置
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摘要
电力机车高次谐波电流引发的牵引网谐振事故影响电气化铁路安全运行,深入研究牵引网阻抗频率特性有重要意义。本文基于谐波注入干预法,提出一种可直接对牵引网谐波阻抗进行测量的测量装置实现方案。测量装置采用级联H桥变流器作为谐波发生器,控制系统采用分层控制结构。通过升压变压器向牵引网注入100~5 000 Hz不同频率的谐波电流,测量注入点处的电压、电流数据,估算牵引网谐波阻抗。仿真分析结果表明,本测量装置在设计频率范围内,能够获得准确的谐波阻抗,并且无需单独的整流环节作为直流电压源,结构简单,控制可靠。
The resonance accident of traction power supply systems,caused by high frequency harmonic currents of electric locomotives,is a threat to the safe and reliable operation of electrified railways.It is important to study the impedance frequency characteristics of the traction power supply system.Based on the harmonic current injection method,a novel scheme for measuring the harmonic impedance of the traction power supply system was proposed.This system adopted the cascaded H-bridge converter as harmonic generator and had a hierarchical control structure.Harmonic currents in the frequency range between 100 Hz and 5 000 Hz can be injected into the traction power feeding network through a boosting transformer.By measuring and recording the voltage and current of the injection point,the harmonic impedance of the traction power supply system can be calculated.The simulation results indicate that the simple and well-controlled apparatus can measure the harmonic impedance accurately in the designed frequency range,without the need for a separate rectifier as the DC voltage source.
The resonance accident of traction power supply systems,caused by high frequency harmonic currents of electric locomotives,is a threat to the safe and reliable operation of electrified railways.It is important to study the impedance frequency characteristics of the traction power supply system.Based on the harmonic current injection method,a novel scheme for measuring the harmonic impedance of the traction power supply system was proposed.This system adopted the cascaded H-bridge converter as harmonic generator and had a hierarchical control structure.Harmonic currents in the frequency range between 100 Hz and 5 000 Hz can be injected into the traction power feeding network through a boosting transformer.By measuring and recording the voltage and current of the injection point,the harmonic impedance of the traction power supply system can be calculated.The simulation results indicate that the simple and well-controlled apparatus can measure the harmonic impedance accurately in the designed frequency range,without the need for a separate rectifier as the DC voltage source.
引文
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[14]华回春,贾秀芳,曹东升,等.系统谐波阻抗估计的极大似然估计方法[J].中国电机工程学报,2014,34(10):1692-1699.HUA Huichun,JIA Xiufang,CAO Dongsheng,et al.A Maximum Likelihood Method for Harmonic Impedance Estimation[J].Proceedings of the CSEE,2014,34(10):1692-1699.
[15]杨少兵,吴命利.基于广义柯西分布的系统侧谐波阻抗估计[J].中国电机工程学报,2014,34(7):1159-1166.YANG Shaobing,WU Mingli.An Assessment Method of Power System Harmonic Impedance Based on Generalized Cauchy Distribution[J].Proceedings of the CSEE,2014,34(7):1159-1166.
[16]HOLMES D G,LIPO T A.电力电子变换器PWM技术原理与实践[M].周克亮,译.北京:人民邮电出版社,2010:299-300.
[2]HE Z,HU H,ZHANG Y,et al.Harmonic Resonance Assessment to Traction Power-supply System Considering Train Model in China High-speed Railway[J].IEEE Transactions on Power Delivery,2014,29(4):1735-1743.
[3]崔恒斌,冯晓云,林轩,等.车网耦合下高速铁路牵引网谐波谐振特性研究[J].电工技术学报,2013,28(9):54-64.CUI Hengbin,FENG Xiaoyun,LIN Xuan,et al.Research on Harmonic Resonance Characteristic of High-speed Railway Traction Net Considering Coupling of Trains and Traction Nets[J].Transactions of China Electrotechnical Society,2013,28(9):54-64.
[4]崔恒斌,冯晓云,林轩,等.牵引网与交直交列车耦合系统谐波谐振特性仿真研究[J].中国电机工程学报,2014,34(16):2736-2745.CUI Hengbin,FENG Xiaoyun,LIN Xuan,et al.Simulation Study of the Harmonic Resonance Characteristics of the Coupling System with a Traction Network and AC-DCAC Trains[J].Proceedings of the CSEE,2014,34(16):2736-2745.
[5]初曦,林飞,杨中平,等.高速列车与牵引供电网高次谐波谐振分析[J].电工技术学报,2013,28(S2):354-359.CHU Xi,LIN Fei,YANG Zhongping,et al.Analysis of High Frequency Resonances in the Power Supply Line of the High Speed Train[J].Transactions of China Electrotechnical Society,2013,28(S2):354-359.
[6]ZHEN Y,HONGTAO S,XIAOLONGY,et al.Harmonic Impedance Measurement for an Islanded Microgrid Using Current Injection[C]//2012IEEE 7th International Power Electronics and Motion Control Conference.Harbin:Academic Press,2012:373-378.
[7]SUMNER M,PALETHORPE B,THOMAS D W P.Impedance Measurement for Improved Power Quality-Part 1:the Measurement Technique[J].IEEE Transactions on Power Delivery,2004,19(3):1442-1448.
[8]吕洋,徐政.投切电容器时的电网谐波阻抗测量方法[J].高电压技术,2009,35(7):1780-1784.LUYang,XU Zheng.Network Harmonic Impedance Measurement Using Capacitor Switching[J].High Voltage Engineering,2009,35(7):1780-1784.
[9]郝福忠,赵锋,李晋城,等.考虑电网谐波影响的电容器投切研究[J].电力系统保护与控制,2011,39(4):79-83.HAO Fuzhong,ZHAO Feng,LI Jincheng,et al.Research of Capacitor Switching Considering Harmonic Influence[J].Research of Capacitor Switching Considering Harmonic Influence,2011,39(4):79-83.
[10]龚华麟,肖先勇,刘亚梅,等.基于主导波动量筛选原理的用户谐波发射水平估计方法[J].中国电机工程学报,2010,30(4):22-27.GONG Hualin,XIAO Xianyong,LIU Yamei,et al.A Method for Assessing Customer Harmonic Emission Level Based on the Dominant Fluctuation Filtering Principle[J].Proceedings of the CSEE,2010,30(4):22-27.
[11]HUI J,FREITAS W,VIEIRAJ C M,et al.Utility Harmonic Impedance Measurement Based on Data Selection[J].IEEE Transactions on Power Delivery,2012,27(4):2193-2202.
[12]解绍锋.基于秩次回归的系统谐波阻抗分析与谐波评估方法[J].电力自动化设备,2010,30(11):29-33.XIE Shaofeng.Harmonic Impedance Analysis and Harmonic Assessment Based on Rank Regression[J].Electric Power Automation Equipment,2010,30(11):29-33.
[13]黄舜,徐永海.基于偏最小二乘回归的系统谐波阻抗与谐波发射水平的评估方法[J].中国电机工程学报,2007,27(1):93-97.HUANG Shun,XU Yonghai.Assessing Harmonic Impedance and the Harmonic Emission Level Based on Partial Least-squares Regression Method[J].Proceedings of the CSEE,2007,27(1):93-97.
[14]华回春,贾秀芳,曹东升,等.系统谐波阻抗估计的极大似然估计方法[J].中国电机工程学报,2014,34(10):1692-1699.HUA Huichun,JIA Xiufang,CAO Dongsheng,et al.A Maximum Likelihood Method for Harmonic Impedance Estimation[J].Proceedings of the CSEE,2014,34(10):1692-1699.
[15]杨少兵,吴命利.基于广义柯西分布的系统侧谐波阻抗估计[J].中国电机工程学报,2014,34(7):1159-1166.YANG Shaobing,WU Mingli.An Assessment Method of Power System Harmonic Impedance Based on Generalized Cauchy Distribution[J].Proceedings of the CSEE,2014,34(7):1159-1166.
[16]HOLMES D G,LIPO T A.电力电子变换器PWM技术原理与实践[M].周克亮,译.北京:人民邮电出版社,2010:299-300.