一种抗电流互感器饱和的工频变化量保护新方案
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摘要
电流互感器(CT)饱和将导致传统工频变化量保护在线路故障时拒动,为解决该问题,该文首先分析工频变化量保护的工作电压与系统阻抗、故障电流变化量之间的关系以及电流互感器饱和对工频变化量保护动作特性的影响,进而提出一种基于系统最大、最小整定阻抗的抗电流互感器饱和的工频变化量保护方案。理论分析及基于PSCAD的仿真表明该算法不仅能够保持工频变化量保护原有的动作性能,还能在电流互感器饱和时准确动作。
Current transformer(CT) saturation will lead to the failure to operate for traditional power frequency variation protection when a fault occurs on line, in order to solve this problem, this paper analyzes the relationship between the frequency variation protection working voltage and system impedance, fault current variation and effect of current transformer saturation on power frequency variation protection operation characteristics, and a novel scheme based on the system maximum and minimum setting impedance power frequency variation protection scheme resisting CT saturation is proposed. Theoretical analysis and PSCAD based simulation verification show that the algorithm can not only maintain the operation performance of the original power frequency variation, but also can act accurately operate under CT saturation.
Current transformer(CT) saturation will lead to the failure to operate for traditional power frequency variation protection when a fault occurs on line, in order to solve this problem, this paper analyzes the relationship between the frequency variation protection working voltage and system impedance, fault current variation and effect of current transformer saturation on power frequency variation protection operation characteristics, and a novel scheme based on the system maximum and minimum setting impedance power frequency variation protection scheme resisting CT saturation is proposed. Theoretical analysis and PSCAD based simulation verification show that the algorithm can not only maintain the operation performance of the original power frequency variation, but also can act accurately operate under CT saturation.
引文
[1]洪树斌,范春菊,陈实.考虑双馈异步风机特性的自适应接地距离保护[J].电工技术学报,2017,32(5):124-133.Hong Shubin,Fan Chunju,Chen Shi.Adaptive ground distance protection considering doubly-fed induction generator characteristics[J].Transactions of China Electrotechnical Society,2017,32(5):124-133.
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[9]刘涛,刘鑫,梁仕斌,等.基于极性变化直流电压源的铁磁元件铁心剩磁通测量方法[J].电工技术学报,2017,32(13):137-144.Liu Tao,Liu Xin,Liang Shibin,et al.Residual flux measuring method on the core of ferromagnetic components based on alternating polarity DC voltage source[J].Transactions of China Electrotechnical Society,2017,32(13):137-144.
[10]王俊凯,梁仕斌,刘涛,等.铁磁元件励磁特性低频测量方法[J].电工技术学报,2017,32(10):168-173.Wang Junkai,Liang Shibin,Liu Tao,et al.Lowfrequency measuring method for ferromagnetic elements excitation characteristics[J].Transactions of China Electrotechnical Society,2017,32(10):168-173.
[11]赵永彬,陆于平.基于虚拟阻抗模型的电流互感器判据[J].电力自动化设备,2007,27(9):43-52.Zhao Yongbin,Lu Yuping.Current transformer saturation criterion based on virtual impedance model[J].Electric Power Automation Equipment,2007,27(9):43-52.
[12]李贵存,刘万顺,贾清泉,等.利用小波原理检测电流互感器饱和的新方法[J].电力系统自动化,2001,25(6):36-39.Li Guicun,Liu Wanshun,Jia Qingquan,et al.A new method for detecting saturation of current transformer based on wavelet transform[J].Auotmation of Electric Power Systems,2001,25(6):36-39.
[13]郑小敏,刘会金,刘霞忠,等.CT饱和引起变压器差动保护误动的分析和对策[J].继电器,2005,33(8):61-63.Zheng Xiaomin,Liu Huijin,Liu Xiazhong,et al.Analysis and countermeasure of transformer differential protection malfunction due to CT saturation[J].Relay,2005,33(8):61-63.
[14]卢其威,王涛,李宗睿,等.基于小波变换和奇异值分解的串联电弧故障检测方法[J].电工技术学报,2017,32(17):208-217.Lu Qiwei,Wang Tao,Li Zongrui,et al.Detection method of series arcing fault based on wavelet transform and singular value decomposition[J].Transactions of China Electrotechnical Society,2017,32(17):208-217.
[15]袁莉芬,孙业胜,何怡刚,等.基于小波包优选的模拟电路故障特征提取方法[J].电工技术学报,2018,33(1):158-165.Yuan Lifen,Sun Yesheng,He Yigang,et al.Fault feature extraction method for analog circuit based on preferred wavelet packet[J].Transactions of China Electrotechnical Society,2018,33(1):158-165.
[2]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与对策[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 systems[J].Auotmation of Electric Power Systems,2000,24(6):54-56.
[3]索南加乐,何方明,焦在滨,等.工频变化量距离元件特性的研究[J].中国电机工程学报,2010,30(28):59-65.Suonan Jiale,He Fangming,Jiao Zaibin,et al.Research on the characteristics of distance element based on the power-frequency voltage and current variation[J].Proceedings of the CSEE,2010,30(28):59-65.
[4]黄鹂,何奔腾.电流互感器饱和对距离保护的影响[J].继电器,2004,32(12):16-20.Huang Li,He Benteng.Influence of current transformer saturation on the distance protection[J].Relay,2004,32(12):16-20.
[5]陈丽艳,何奔腾,钱国明,等.基于二次电流下降的电流互感器饱和判别方法[J].电力系统自动化,2008,32(14):59-63.Chen Liyan,He Benteng,Qian Guoming,et al.Detection method for current transformer saturation based on the dropping of the secondary current[J].Auotmation of Electric Power Systems,2008,32(14):59-63.
[6]王志鸿,郑玉平,贺家李.通过计算谐波比确定母线保护中电流互感器的饱和[J].电力系统及其自动化学报,2000,12(5):19-24.Wang Zhihong,Zheng Yuping,He Jiali.A algorithm to distinguish current transformer's saturation by calculating the harmonics ratio of branch current[J].Proceedings of the EPSA,2000,12(5):19-24.
[7]李忠安,何奔腾.磁制动母线差动保护研究[J].继电器,2000,28(9):10-14.Li Zhong’an,He Benteng.Study on the differential protection of busbar with magnetic restraint[J].Relay,2000,28(9):10-14.
[8]黄志元,何奔腾,张雪松.利用磁制动检测电流互感器饱和的实用化研究[J].电力系统自动化,2006,30(4):75-79.Huang Zhiyuan,He Benteng,Zhang Xuesong.Research on the practicality of current transformer saturation detection using the magnetic restraint principle[J].Auotmation of Electric Power Systems,2006,30(4):75-79.
[9]刘涛,刘鑫,梁仕斌,等.基于极性变化直流电压源的铁磁元件铁心剩磁通测量方法[J].电工技术学报,2017,32(13):137-144.Liu Tao,Liu Xin,Liang Shibin,et al.Residual flux measuring method on the core of ferromagnetic components based on alternating polarity DC voltage source[J].Transactions of China Electrotechnical Society,2017,32(13):137-144.
[10]王俊凯,梁仕斌,刘涛,等.铁磁元件励磁特性低频测量方法[J].电工技术学报,2017,32(10):168-173.Wang Junkai,Liang Shibin,Liu Tao,et al.Lowfrequency measuring method for ferromagnetic elements excitation characteristics[J].Transactions of China Electrotechnical Society,2017,32(10):168-173.
[11]赵永彬,陆于平.基于虚拟阻抗模型的电流互感器判据[J].电力自动化设备,2007,27(9):43-52.Zhao Yongbin,Lu Yuping.Current transformer saturation criterion based on virtual impedance model[J].Electric Power Automation Equipment,2007,27(9):43-52.
[12]李贵存,刘万顺,贾清泉,等.利用小波原理检测电流互感器饱和的新方法[J].电力系统自动化,2001,25(6):36-39.Li Guicun,Liu Wanshun,Jia Qingquan,et al.A new method for detecting saturation of current transformer based on wavelet transform[J].Auotmation of Electric Power Systems,2001,25(6):36-39.
[13]郑小敏,刘会金,刘霞忠,等.CT饱和引起变压器差动保护误动的分析和对策[J].继电器,2005,33(8):61-63.Zheng Xiaomin,Liu Huijin,Liu Xiazhong,et al.Analysis and countermeasure of transformer differential protection malfunction due to CT saturation[J].Relay,2005,33(8):61-63.
[14]卢其威,王涛,李宗睿,等.基于小波变换和奇异值分解的串联电弧故障检测方法[J].电工技术学报,2017,32(17):208-217.Lu Qiwei,Wang Tao,Li Zongrui,et al.Detection method of series arcing fault based on wavelet transform and singular value decomposition[J].Transactions of China Electrotechnical Society,2017,32(17):208-217.
[15]袁莉芬,孙业胜,何怡刚,等.基于小波包优选的模拟电路故障特征提取方法[J].电工技术学报,2018,33(1):158-165.Yuan Lifen,Sun Yesheng,He Yigang,et al.Fault feature extraction method for analog circuit based on preferred wavelet packet[J].Transactions of China Electrotechnical Society,2018,33(1):158-165.