直流经串补接入系统下的谐波振荡分析及控制措施
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摘要
2017年5月29日永富直流工程发生一起因区外交流故障引发的换相失败,其间大量谐波被激发且长时间不衰减导致多组滤波器跳闸及直流限功率。文中结合现场录波和事件记录分析了事件中的谐波特征和恢复特性,提出了直流经全串补线路接入交流电网发生谐波振荡是激发大量谐波的直接原因,分析了谐波衰减特性与滤波器组数的关系。结合EMTDC仿真分析,验证了谐波特性与串补、直流功率及高抗的关系,在此基础上提出直流运行控制方案并实施自动旁路串补控制措施。最后现场试验验证了直流控制措施的有效性。
On May 29, 2017, a commutation failure occurred in Yongfu DC project in China due to out-of-zone AC system short circuit fault. During this course, a large number of harmonics were excited and sustained for a long time, resulting in tripping of multiple groups of filters and DC power limiting. In this paper, the harmonic characteristics and recovery characteristics of the incident are analyzed based on the on-site recording and sequences of event. It is proposed that harmonic oscillation of DC connected to AC network via full series compensated lines is the direct cause of generating a large number of harmonics. The relationship between harmonic attenuation characteristics and the number of filter groups is qualitatively analyzed. Combined with EMTDC simulation analysis, the relationship between harmonic characteristics and series compensation, DC power and high reactance is verified. On this basis, DC operation control scheme is proposed and automatic bypass series compensation control measures are implemented. Finally, field tests verify the effectiveness of DC control measures.
On May 29, 2017, a commutation failure occurred in Yongfu DC project in China due to out-of-zone AC system short circuit fault. During this course, a large number of harmonics were excited and sustained for a long time, resulting in tripping of multiple groups of filters and DC power limiting. In this paper, the harmonic characteristics and recovery characteristics of the incident are analyzed based on the on-site recording and sequences of event. It is proposed that harmonic oscillation of DC connected to AC network via full series compensated lines is the direct cause of generating a large number of harmonics. The relationship between harmonic attenuation characteristics and the number of filter groups is qualitatively analyzed. Combined with EMTDC simulation analysis, the relationship between harmonic characteristics and series compensation, DC power and high reactance is verified. On this basis, DC operation control scheme is proposed and automatic bypass series compensation control measures are implemented. Finally, field tests verify the effectiveness of DC control measures.
引文
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[3] 周长春,徐政.联于弱交流系统的HVDC故障恢复特性仿真分析[J].电网技术,2003,27(11):18-21.ZHOU Changchun,XU Zheng.Simulation and analysis of recovery characteristics of HVDC connected to AC system with weak strength[J].Power System Technology,2003,27(11):18-21.
[4] 姚文峰,张勇,洪潮,等.落点弱交流系统的直流输电系统运行特性及改善措施[J].南方电网技术,2015,9(4):54-59.YAO Wenfeng,ZHANG Yong,HONG Chao,et al.Operation characteristics and improved measures of DC system terminated at weak AC system[J].Southern Power System Technology,2015,9(4):54-59.
[5] 丁立国,沈阳武,许加柱,等.连接弱交流系统的高压直流换流站无功补偿协调控制策略[J].电力系统自动化,2017,41(8):22-29.DOI:10.7500/AEPS20160921001.DING Liguo,SHEN Yangwu,XU Jiazhu,et al.Coordinated control strategy of reactive compensation for HVDC convert station connected to weak AC system[J].Automation of Electric Power Systems,2017,41(8):22-29.DOI:10.7500/AEPS20160921001.
[6] 蒋维勇,刘建琴,韩丰,等.接入弱交流系统的背靠背直流输电系统控制策略改进[J].电力系统自动化,2016,40(6):71-77.JIANG Weiyong,LIU Jianqin,HAN Feng,et al.Improvement of back-to-back DC transmission system control strategy for weak AC system[J].Automation of Electric Power Systems,2016,40(6):71-77.
[7] 洪潮.馈入弱交流系统的直流输电换相失败恢复特性对输电能力的影响分析[J].南方电网技术,2017,11(3):6-12.HONG Chao.Analysis on the influence of commutation failure fault recovery characteristics of HVDC connected to weak AC system on transmission capability[J].Southern Power System Technology,2017,11(3):6-12.
[8] 林海雪,孙树勤.电力系统谐波[M].北京:中国电力出版社,2008.LIN Haixue,SUN Shuqin.Power system harmonics[M].Beijing:China Electric Power Press,2008.
[9] 李德佳,王维俭,毕大强.变压器暂态饱和与和应涌流实例分析[J].高压电器,2005,41(1):12-15.LI Dejia,WANG Weijian,BI Daqiang.Analysis of transient saturation and sympathetic inrush of transformers[J].High Voltage Apparatus,2005,41(1):12-15.
[10] 晏小彬,刘天琪,李兴源,等.高压直流换流变压器暂态铁心饱和不稳定及抑制[J].华东电力,2011,39(9):1446-1450.YAN Xiaobin,LIU Tianqi,LI Xingyuan,et al.Transient core saturation instability of HVDC converter transformer and its suppression[J].East China Electric Power,2011,39(9):1446-1450.