基于直流线路参数的50Hz谐波放大评估方法
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摘要
针对近几年现场运行暴露出来的变压器空投时50Hz谐波电流流经直流线路出现放大的问题,提出了一种通过直流线路参数来评估直流工程50Hz谐波放大的方法。首先,推导了长距离直流输电线路50Hz参数计算方法;其次,依托于某在运高压直流工程进行直流线路50 Hz参数计算,并以此深入研究了直流线路出现50Hz谐波放大的本质原因以及谐波放大的极值点,进而提出了用于评估直流谐波放大水平的指标;最后,通过EMTDC仿真平台验证了所提方法的正确性,并应用于实际工程进行谐波评估。结果表明:通过50Hz参数计算方法评估的直流谐波放大水平与实际工程一致,所提出的谐波放大极值点计算和放大评估方法不依赖于详细直流模型和EMTDC仿真。
In recent years,the enlargement phenomenon of 50 Hz harmonic current on DC line caused by energization of unloaded transformer is exposed on HVDC projects in field.To solve the problem above,a 50 Hz harmonic amplification evaluation method based on DC line parameters is proposed.Firstly,the calculation method of 50 Hz parameters for the long distance HVDC transmission line is derived.Secondly,50 Hz parameters of DC lines in a certain DC project are calculated.Then the essential reason and the extreme point of harmonic amplification are analyzed based on the results,furthermore,the index for evaluating DC harmonic amplification level is proposed.Finally,the correctness of the method proposed is verified by EMTDC simulation results,and the method is applied to the harmonic evaluation of an actual project.The results show that the evaluation results obtained by the proposed method are consistent with the practical project.Both the methods proposed to calculate harmonic amplification extreme points and evaluate DC harmonic level are independent with the detailed DC model and EMTDC simulation.
In recent years,the enlargement phenomenon of 50 Hz harmonic current on DC line caused by energization of unloaded transformer is exposed on HVDC projects in field.To solve the problem above,a 50 Hz harmonic amplification evaluation method based on DC line parameters is proposed.Firstly,the calculation method of 50 Hz parameters for the long distance HVDC transmission line is derived.Secondly,50 Hz parameters of DC lines in a certain DC project are calculated.Then the essential reason and the extreme point of harmonic amplification are analyzed based on the results,furthermore,the index for evaluating DC harmonic amplification level is proposed.Finally,the correctness of the method proposed is verified by EMTDC simulation results,and the method is applied to the harmonic evaluation of an actual project.The results show that the evaluation results obtained by the proposed method are consistent with the practical project.Both the methods proposed to calculate harmonic amplification extreme points and evaluate DC harmonic level are independent with the detailed DC model and EMTDC simulation.
引文
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[10]刘俊磊,王钢,李海锋,等.计及直流控制特性的直流系统等值模型及其谐波计算[J].电力系统自动化,2014,38(19):67-73.DOI:10.7500/AEPS20130912010.LIU Junlei,WANG Gang,LI Haifeng,et al.HVDC system equivalent model and harmonic calculation with DC control system characteristics taken into account[J].Automation of Electric Power Systems,2014,38(19):67-73.DOI:10.7500/AEPS20130912010.
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[13]杨汾艳,朱韬析,丁晓兵,等.考虑涌流影响的直流线路50 Hz分量机理性研究[J].高电压技术,2015,41(10):3363-3371.YANG Fenyan,ZHU Taoxi,DING Xiaobing,et al.Research on 50 Hz component in HVDC transmission lines considering the influence of inrush current[J].High Voltage Engineering,2015,41(10):3363-3371.
[14]樊丽娟,黄莹,徐迪臻,等.送端励磁涌流对溪洛渡直流50 Hz保护的影响[J].南方电网技术,2015,9(6):34-38.FAN Lijuan,HUANG Ying,XU Dizhen,et al.Impact of magnetizing inrush current at sending end on 50Hz protection of Xiluodu HVDC transmission project[J].Southern Power System Technology,2015,9(6):34-38.
[15]刘心旸,李亚男,蒋维勇.基于波参数的直流线路谐波阻抗解析方法[J].电网技术,2015,39(10):2842-2847.LIU Xinyang,LI Yanan,JIANG Weiyong.A novel analytic method of DC line harmonic impedance based on wave parameters[J].Power System Technology,2015,39(10):2842-2847.
[16]李爱民,蔡泽祥,李晓华,等.高压直流输电线路行波保护影响因素分析及改进[J].电力系统自动化,2010,34(10):76-80.LI Aimin,CAI Zexiang,LI Xiaohua,et al.Analysis of influence factors and improvement of traveling wave protections for HVDC line[J].Automation of Electric Power Systems,2010,34(10):76-80.
[17]李爱民,蔡泽祥,李晓华.直流线路行波传播特性的解析[J].中国电机工程学报,2010,30(25):94-100.LI Aimin,CAI Zexiang,LI Xiaohua.Study on the propagation characteristics of traveling waves in HVDC transmission lines on the basis of analytical method[J].Proceedings of the CSEE,2010,30(25):94-100.
[2]张庆武,王永平,陈小军,等.特高压直流控制保护系统设计与开发[J].电力系统自动化,2013,37(21):88-93.ZHANG Qingwu,WANG Yongping,CHEN Xiaojun,et al.Design and development of control and protection system for UHVDC[J].Automation of Electric Power Systems,2013,37(21):88-93.
[3]杨光亮,邰能灵,郑晓冬,等.±800kV特高压直流输电控制保护系统分析[J].高电压技术,2012,38(12):3277-3283.YANG Guangliang,TAI Nengling,ZHENG Xiaodong,et al.Discussion of±800 kV UHVDC transmission control and protection system[J].High Voltage Engineering,2012,38(12):3277-3283.
[4]穆子龙,李兴源.交、直流输电系统相互影响引起的谐波不稳定问题[J].电力系统自动化,2009,33(2):96-100.MU Zilong,LI Xingyuan.Harmonic instability caused by interactions between AC and DC transmission systems[J].Automation of Electric Power Systems,2009,33(2):96-100.
[5]郝巍,李兴源,金小明,等.高压直流输电引起的谐波不稳定及其相关问题[J].电力系统自动化,2006,30(19):94-99.HAO Wei,LI Xingyuan,JIN Xiaoming,et al.A survey of harmonic instability and related problem caused by HVDC[J].Automation of Electric Power Systems,2006,30(19):94-99.
[6]樊丽娟,穆子龙,金小明,等.高压直流输电系统送端谐波不稳定问题的判据[J].电力系统自动化,2012,36(4):62-68.FAN Lijuan,MU Zilong,JIN Xiaoming,et al.Criterion of harmonic instability at sending end of HVDC power transmission system[J].Automation of Electric Power Systems,2012,36(4):62-68.
[7]王峰,朱光友,游广增,等.高压直流输电直流侧谐波电流计算[J].高电压技术,2009,35(9):2275-2279.WANG Feng,ZHU Guangyou,YOU Guangzeng,et al.Calculation of DC side harmonic currents for HVDC transmission[J].High Voltage Engineering,2009,35(9):2275-2279.
[8]WANG Feng,XU Zheng,HUANG Ying.DC harmonic current calculation for HVDC systems based on the classical transmission line model[C]//IEEE International Conference on Power System Technology,October 24-28,2010,Hangzhou,China:1-5.
[9]张哲任,徐政,薛英林.LCC-MMC混合直流输电系统直流侧谐波电流计算[J].电力系统自动化,2014,38(23):65-70.DOI:10.7500/AEPS20130620013.ZHANG Zheren,XU Zheng,XUE Yinglin.Calculation of DC side harmonic currents for LCC-MMC hybrid HVDC transmission system[J].Automation of Electric Power Systems,2014,38(23):65-70.DOI:10.7500/AEPS20130620013.
[10]刘俊磊,王钢,李海锋,等.计及直流控制特性的直流系统等值模型及其谐波计算[J].电力系统自动化,2014,38(19):67-73.DOI:10.7500/AEPS20130912010.LIU Junlei,WANG Gang,LI Haifeng,et al.HVDC system equivalent model and harmonic calculation with DC control system characteristics taken into account[J].Automation of Electric Power Systems,2014,38(19):67-73.DOI:10.7500/AEPS20130912010.
[11]徐政.耦合长线稳态分析的非解耦模型及其算法[J].中国电机工程学报,1995,15(5):342-346.XU Zheng.Coupled model and its computation for steady state analysis of multiphase transmission lines[J].Proceedings of the CSEE,1995,15(5):342-346.
[12]徐韬,翁华,徐政,等.高压直流输电非解耦线路模型改进算法[J].中国电机工程学报,2011,31(7):71-76.XU Tao,WENG Hua,XU Zheng,et al.An improved calculating method for the coupled line model of HVDC transmission[J].Proceedings of the CSEE,2011,31(7):71-76.
[13]杨汾艳,朱韬析,丁晓兵,等.考虑涌流影响的直流线路50 Hz分量机理性研究[J].高电压技术,2015,41(10):3363-3371.YANG Fenyan,ZHU Taoxi,DING Xiaobing,et al.Research on 50 Hz component in HVDC transmission lines considering the influence of inrush current[J].High Voltage Engineering,2015,41(10):3363-3371.
[14]樊丽娟,黄莹,徐迪臻,等.送端励磁涌流对溪洛渡直流50 Hz保护的影响[J].南方电网技术,2015,9(6):34-38.FAN Lijuan,HUANG Ying,XU Dizhen,et al.Impact of magnetizing inrush current at sending end on 50Hz protection of Xiluodu HVDC transmission project[J].Southern Power System Technology,2015,9(6):34-38.
[15]刘心旸,李亚男,蒋维勇.基于波参数的直流线路谐波阻抗解析方法[J].电网技术,2015,39(10):2842-2847.LIU Xinyang,LI Yanan,JIANG Weiyong.A novel analytic method of DC line harmonic impedance based on wave parameters[J].Power System Technology,2015,39(10):2842-2847.
[16]李爱民,蔡泽祥,李晓华,等.高压直流输电线路行波保护影响因素分析及改进[J].电力系统自动化,2010,34(10):76-80.LI Aimin,CAI Zexiang,LI Xiaohua,et al.Analysis of influence factors and improvement of traveling wave protections for HVDC line[J].Automation of Electric Power Systems,2010,34(10):76-80.
[17]李爱民,蔡泽祥,李晓华.直流线路行波传播特性的解析[J].中国电机工程学报,2010,30(25):94-100.LI Aimin,CAI Zexiang,LI Xiaohua.Study on the propagation characteristics of traveling waves in HVDC transmission lines on the basis of analytical method[J].Proceedings of the CSEE,2010,30(25):94-100.