电流互感器饱和对风电场送出线纵差保护的影响及对策
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摘要
目前风电等新能源应用越来越广泛,而风电场送出线路电流互感器的配置依旧采用常规的方法进行选型计算。当风电场送出线发生故障时,由于风电场呈现出弱电源特性,且输出故障电流含有大量的非周期分量使电流互感器易发生饱和现象,从而导致送出线路纵差保护误动。利用PSCAD和Matlab软件,针对风电场送出线路电流互感器的不同饱和情况分别进行了仿真分析。为了提高纵差保护的可靠性,给出在保护中采用改进递推两点乘积算法的措施。仿真结果表明,改进递推两点乘积算法能有效避免电流互感器饱和所带来的区外故障保护误动作的问题,且计算、动作时间更快,从而提高了送出线路纵差保护的可靠性和快速性。
New energies, such as wind and electricity, have been widely applied. However, for the configuration of current transformer of the output transmission line in wind farms, people still do the lectotype calculation in conventional ways. When the output transmission line breaks down, the power supply of wind farms will be weak, and a large number of aperiodic components in the faulty current will be easy to make the current transformer become saturated, which will result in the malfunction of the differential protection. In the aim of improving the reliability of differential protection, we will use PSCAD and Matlab to conduct a simulation analysis on the different saturation situation of the output transmission lines, finding out the solutions to the improvements of the reliability of differential protection. The results of simulation show that the improved recursive two-point product method can effectively prevent external mal-operations caused by the current transformer saturation. Besides, the calculation and operation time of this method can be faster, which will enhance the reliability and improve the speed of the differential protection of the output transmission line.
New energies, such as wind and electricity, have been widely applied. However, for the configuration of current transformer of the output transmission line in wind farms, people still do the lectotype calculation in conventional ways. When the output transmission line breaks down, the power supply of wind farms will be weak, and a large number of aperiodic components in the faulty current will be easy to make the current transformer become saturated, which will result in the malfunction of the differential protection. In the aim of improving the reliability of differential protection, we will use PSCAD and Matlab to conduct a simulation analysis on the different saturation situation of the output transmission lines, finding out the solutions to the improvements of the reliability of differential protection. The results of simulation show that the improved recursive two-point product method can effectively prevent external mal-operations caused by the current transformer saturation. Besides, the calculation and operation time of this method can be faster, which will enhance the reliability and improve the speed of the differential protection of the output transmission line.
引文
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[15]韩璐,李凤婷,王春艳,等.风电接入对继电保护的影响综述[J].电力系统保护与控制,2016,44(16):163-169.HAN Lu,LI Fengting,WANG Chunyan,et al.A survey on impact of wind farm integration on relay protection[J].Power System Protection and Control,2016,44(16):163-169.
[16]叶汉民,谭惠尹,穆晓慧.基于傅里叶算法的衰减直流分量消除的研究[J].电测与仪表,2011,48(2):15-20.YE Hanmin,TAN Huiyin,MU Xiaohui.A research on eliminating decaying DC component based on Fourier algorithm[J].Electrical Measurement&Instrumentation,2011,48(2):15-20.
[17]于群,曹娜.电力系统微机继电保护[M].北京:机械工业出版社,2008.
[2]张丽英,叶廷路,辛耀中,等.大规模风电接入电网的相关问题及措施[J].中国电机工程学报,2010,30(25):1-9.ZHANG Liying,YE Tinglu,XIN Yaozhong,et al.Problems and measures of power grid accommodating large scale wind power[J].Proceedings of the CSEE,2010,30(25):1-9.
[3]李旭,黄继东,倪传坤,等.不同电流互感器混用对线路差动保护的影响及对策的研究[J].电力系统保护与控制,2014,42(3):141-145.LI Xu,HUANG Jidong,NI Chuankun,et al.Influence of mixing different types of current transformers on line differential protection and the countermeasures[J].Power System Protection and Control,2014,42(3):141-145.
[4]王锬.电磁式和光电式电流互感器混用对线路差动保护影响的研究[D].太原:太原理工大学,2016.WANG Tan.Research on the influence of mixed use of electromagnetic and electro-optical current transformer in differential protection[D].Taiyuan:Taiyuan University of Technology,2016.
[5]HAJIPOUR E,VAKILIAN M,SANAYE-PASAND M,et al.Current-transformer saturation compensation for transformer differential relays[J].IEEE Transactions on Power Delivery,2015,30(5):2293-2302.
[6]陈建玉,孟宪民,张振旗,等.电流互感器饱和对继电保护影响的分析及对策[J].电力系统自动化,2000,24(6):54-56.CHEN Jianyu,MENG Xianmin,ZHANG Zhenqi,et al.Influence of the current transformer saturation on relay unit and its countermeasures in medium voltage power system[J].Automation of Electric Power Systems,2000,24(6):54-56.
[7]于梦瑶,于群,史建省,等.电流互感器饱和对低压电动机保护的影响及对策[J].电力系统保护与控制,2014,42(18):78-82.YU Mengyao,YU Qun,SHI Jiansheng,et al.Influences and countermeasures for saturation of current transformers on low voltage motors protections[J].Power System Protection and Control,2014,42(18):78-82.
[8]何世恩,姚旭,徐善飞.大规模风电接入对继电保护的影响与对策[J].电力系统保护与控制,2013,41(1):21-27.HE Shien,YAO Xu,XU Shanfei.Impact of large-scale wind power integration on relay protection and countermeasures[J].Power System Protection and Control,2013,41(1):21-27.
[9]钟显,樊艳芳,王一波.双馈集群汇集站主变及送出线路继电保护研究[J].电力系统保护与控制,2016,44(5):47-54.ZHONG Xian,FAN Yanfang,WANG Yibo.Research of transformer and outgoing line protection of collection station where cluster of double-fed wind farms put in[J].Power System Protection and Control,2016,44(5):47-54.
[10]李菁,郑涛,赵裕童,等.双馈风电短路电流特性对距离保护的影响分析[J].电力系统保护与控制,2017,45(6):37-47.LI Jing,ZHENG Tao,ZHAO Yutong,et al.Impact of doubly-fed system short-circuit current characteristics on the transmission line distance protection[J].Power System Protection and Control,2017,45(6):37-47.
[11]WU Yahui,DONG Xinzhou,MIRSAEIDI S.Modeling and simulation of air-gapped current transformer based on preisach theory[J].Protection and Control of Modern Power Systems,2017,2(2):111-121.DOI:10.1186/s41601-017-0046-0.
[12]潘文霞,杨刚,刘明洋,等.考虑Crowbar电阻的双馈电机短路电流计算[J].中国电机工程学报,2016,36(13):3629-3634,3382.PAN Wenxia,YANG Gang,LIU Mingyang,et al.Calculation of short-circuit current of DFIG with the considering of crowbar resistance[J].Proceedings of the CSEE,2016,36(13):3629-3634,3382.
[13]曹娜,于群.风电场建模技术及应用[M].北京:机械工业出版社,2015.
[14]张保会,王进,李光辉,等.风力发电机集团式接入电力系统的故障特征分析[J].电网技术,2012,36(7):176-183.ZHANG Baohui,WANG Jin,LI Guanghui,et al.Analysis on fault features of wind turbine generators concentratedly connected to power grid[J].Power System Technology,2012,36(7):176-183.
[15]韩璐,李凤婷,王春艳,等.风电接入对继电保护的影响综述[J].电力系统保护与控制,2016,44(16):163-169.HAN Lu,LI Fengting,WANG Chunyan,et al.A survey on impact of wind farm integration on relay protection[J].Power System Protection and Control,2016,44(16):163-169.
[16]叶汉民,谭惠尹,穆晓慧.基于傅里叶算法的衰减直流分量消除的研究[J].电测与仪表,2011,48(2):15-20.YE Hanmin,TAN Huiyin,MU Xiaohui.A research on eliminating decaying DC component based on Fourier algorithm[J].Electrical Measurement&Instrumentation,2011,48(2):15-20.
[17]于群,曹娜.电力系统微机继电保护[M].北京:机械工业出版社,2008.