一种直流配电网线路故障测距新方法
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摘要
该文提出一种直流配电网线路故障测距新方法。设计了一种直流线路故障测距模块,其由直流电压源、电容和可调电感以及开关组成;当直流线路发生故障,由直流断路器快速动作,在故障区间内将测距模块的电容和电感与线路阻抗等效为RLC串联电路;根据RLC二阶电路零输入响应特性,计算其等效串联电阻,并调节测距模块的电感量;然后通过提取电容初始放电至电流峰值这段时间内的电容电压和电流值,列写能量守恒方程,从而计算故障距离。在PSCAD/EMTDC中搭建了双端直流配电网的模型,并利用MATLAB对所提故障测距方法进行仿真,结果表明,该方法能够对直流配电网线路的故障点进行准确定位,原理简单、抗过渡电阻能力强。最后将所提方法与其它方法进行了对比验证。
This paper presents a novel line fault location method for DC distribution network. A fault location module of DC line is designed, which is composed of DC voltage source, capacitance, adjustable inductance and switches. First, DC circuit breakers act quickly when the DC line fault is created, and capacitance and inductance of the location module and the DC line impedance are equivalent to RLC series circuit in fault section. According to zero input response characteristics of second order RLC circuit, its equivalent series resistance is calculated, Meanwhile, the inductance of the location module is readjusted. Then, energy conservation equation is written by extracting both voltage and current of the capacitance during the period from its initial discharge to peak current, and so as to calculate fault distance. A two terminal DC distribution network model based on PSCAD/EMTDC is built, and the proposed fault location method is simulated by MATLAB. The results show that this method can locate the line fault point of DC distribution network accurately, and has advantages of simple principle and anti-transition resistance ability. Finally, the proposed method is compared with other location methods to reveal its advantages.
This paper presents a novel line fault location method for DC distribution network. A fault location module of DC line is designed, which is composed of DC voltage source, capacitance, adjustable inductance and switches. First, DC circuit breakers act quickly when the DC line fault is created, and capacitance and inductance of the location module and the DC line impedance are equivalent to RLC series circuit in fault section. According to zero input response characteristics of second order RLC circuit, its equivalent series resistance is calculated, Meanwhile, the inductance of the location module is readjusted. Then, energy conservation equation is written by extracting both voltage and current of the capacitance during the period from its initial discharge to peak current, and so as to calculate fault distance. A two terminal DC distribution network model based on PSCAD/EMTDC is built, and the proposed fault location method is simulated by MATLAB. The results show that this method can locate the line fault point of DC distribution network accurately, and has advantages of simple principle and anti-transition resistance ability. Finally, the proposed method is compared with other location methods to reveal its advantages.
引文
[1]薛士敏,陈超超,金毅,等.直流配电系统保护技术研究综述[J].中国电机工程学报,2014,34(19):3114-3122.Xue Shimin,Chen Chaochao,Jin Yi,et al.A research review of protection technology for DC distribution system[J].Proceedings of the CSEE,2014,34(19):3114-3122(in Chinese).
[2]胡竞竞,徐习东,裘鹏,等.直流配电系统保护技术研究综述[J].电网技术,2014,38(4):844-851.Hu Jingjing,Xu Xidong,Qiu Peng,et al.A review of the protection methods in DC distribution system[J].Power System Technology,2014,38(4):844-851(in Chinese).
[3]江道灼,郑欢.直流配电网研究现状与展望[J].电力系统自动化,2012,36(8):98-104.Jiang Daozhuo,Zheng Huan.Research status and developing prospect of DC distribution network[J].Automation of Electric Power Systems,2012,36(8):98-104(in Chinese).
[4]Suonan J,Gao S,Song G,et al.A novel fault-location Method for HVDC transmission lines[J].IEEE Transactions on Power Delivery,2010,25(2):1203-1209.
[5]宋国兵,李德坤,褚旭,等.基于参数识别原理的VSC-HVDC输电线路单端故障定位[J].电网技术,2012,36(12):94-99.Song Guobing,Li Dekun,Chu Xu,et al.One-terminal fault location for VSC-HVDC transmission lines based on principles of parameter identification[J].Power System Technology,2012,36(12):94-99(in Chinese).
[6]廖凯,何正友,李小鹏.基于行波固有频率的高压直流输电线路故障定位[J].电力系统自动化,2012,36(18):1-6.Liao Ka,He Zhengyou,Li Xiaopeng.Fault location of HVDCtransmission line based on the natural frequency of traveling wave[J].Automation of Electric Power Systems,2012,36(18):1-6(in Chinese).
[7]徐俊明,汪芳宗,尹星,等.基于Hilbert-Huang变换的行波法高压输电线路故障定位[J].电力系统保护与控制,2012,40(2):88-92.Xu Junming,Wang Fangzong,Yin Xing,et al.A traveling wave fault location method for high voltage power transmission lines based on Hilbert-Huang transform[J].Power System Protection and Control,2012,40(2):88-92(in Chinese).
[8]贾惠彬,苏思岚,李明舒,等.考虑线路参数频变特性的小波域行波信号奇异性增强方法[J].电工技术学报,2017,32(15):153-160.Jia Huibin,Su Silan,Li Mingshu,et al.A singularity enhancement method in wavelet domain for traveling-wave with considering frequency characteristic of line parameter[J].Transactions of China Electrotechnical Society,2017,32(15):153-160(in Chinese).
[9]Zhang X,Tai N,Wang Y,et al.EMTR-based fault location for DCline in VSC-MTDC system using high-frequency currents[J].IETGeneration Transmission&Distribution,2017,11(10):2499-2507.
[10]Tang L,Ooi B T.Locating and isolating DC faults in multi-terminal DC systems[J].IEEE Transactions on Power Delivery,2007,22(3):1877-1884.
[11]陈玥云,覃剑,王欣,等.配电网故障测距综述[J].电网技术,2006,30(18):89-93.Chen Yueyun,Qin Jian,Wang Xin,et al.A survey on fault location for distribution network[J].Power System Technology,2006,30(18):89-93(in Chinese).
[12]崔浩,王丰华,穆卡,等.基于实际波速的多端输电线路行波故障测距方法[J].电工电能新技术,2017,36(2):74-80.Cui Hao,Wang Fenghua,Mu Ka,et al.Real-time velocity based fault location method of travelling wave for multi-terminal transmission lines[J].Advanced Technology of Electrical Engineering and Energy,2017,36(2):74-80(in Chinese).
[13]许珉,杨艳伟,申克运,等.基于小波变换的电缆短距离开路故障测距[J].电力系统保护与控制,2013,41(4):112-116.Xu Min,Yang Yanwei,Shen Keyun,et al.Cable short open-circuit fault location based on wavelet transform[J].Power System Protection and Control,2013,41(4):112-116(in Chinese).
[14]和敬涵,张明,罗国敏,等.一种利用故障暂态过程的柔性直流配电网故障测距方法[J].电网技术,2017,41(3):985-992.He Jinghan,Zhang Ming,Luo Guomin,et al.A fault location method for flexible DC distribution network based on fault transient process[J].Power System Technology,2017,41(3):985-992(in Chinese).
[15]Hagh M T,Razi K,Taghizadeh H.Fault classification and location of power transmission lines using artificiall neural network[C]//International Power Engineering Conference.Singapore:IEEE,2008:1109-1114.
[16]Park J D,Candelaria J,Ma L,et al.DC ring-bus microgrid fault protection and identification of fault location[J].IEEE Transactions on Power Delivery,2013,28(4):2574-2584.
[17]李斌,何佳伟.柔性直流配电系统故障分析及限流方法[J].中国电机工程学报,2015,35(12):3026-3036.Lin Bin,He Jiawei.DC fault analysis and current limiting technique for VSC-based DC distribution system[J].Proceedings of the CSEE,2015,35(12):3026-3036(in Chinese).
[18]Mohanty R,Balaji U S M,Pradhan A KAn.Accurate noniterative fault-location technique for low-voltage DC microgrid[J].IEEETransactions on Power Delivery,2016,31(2):475-481.
[19]王帅,毕天姝,贾科.基于主动脉冲的MMC-HVDC单极接地故障测距[J].电工技术学报,2017,32(1):12-19.Wang Shuai,Bi Tianshu,Jia Ke.Single terminal fault location for MMC-HVDC transmission line using active pulse[J].Transactions of China Electrotechnical Society,2017,32(1):12-19(in Chinese).
[20]李德坤,宋国兵,高淑萍,等.VSC-HVDC输电线路单端行波自动化故障定位方法研究[J].电网技术,2013,37(4):1128-1133.Li Dekun,Song Guobing,Gao Shuping,et al.Study on automatic fault location for VSC-HVDC transmission lines based on one-terminal traveling wave[J].Power System Technology,2013,37(4):1128-1133(in Chinese).
[2]胡竞竞,徐习东,裘鹏,等.直流配电系统保护技术研究综述[J].电网技术,2014,38(4):844-851.Hu Jingjing,Xu Xidong,Qiu Peng,et al.A review of the protection methods in DC distribution system[J].Power System Technology,2014,38(4):844-851(in Chinese).
[3]江道灼,郑欢.直流配电网研究现状与展望[J].电力系统自动化,2012,36(8):98-104.Jiang Daozhuo,Zheng Huan.Research status and developing prospect of DC distribution network[J].Automation of Electric Power Systems,2012,36(8):98-104(in Chinese).
[4]Suonan J,Gao S,Song G,et al.A novel fault-location Method for HVDC transmission lines[J].IEEE Transactions on Power Delivery,2010,25(2):1203-1209.
[5]宋国兵,李德坤,褚旭,等.基于参数识别原理的VSC-HVDC输电线路单端故障定位[J].电网技术,2012,36(12):94-99.Song Guobing,Li Dekun,Chu Xu,et al.One-terminal fault location for VSC-HVDC transmission lines based on principles of parameter identification[J].Power System Technology,2012,36(12):94-99(in Chinese).
[6]廖凯,何正友,李小鹏.基于行波固有频率的高压直流输电线路故障定位[J].电力系统自动化,2012,36(18):1-6.Liao Ka,He Zhengyou,Li Xiaopeng.Fault location of HVDCtransmission line based on the natural frequency of traveling wave[J].Automation of Electric Power Systems,2012,36(18):1-6(in Chinese).
[7]徐俊明,汪芳宗,尹星,等.基于Hilbert-Huang变换的行波法高压输电线路故障定位[J].电力系统保护与控制,2012,40(2):88-92.Xu Junming,Wang Fangzong,Yin Xing,et al.A traveling wave fault location method for high voltage power transmission lines based on Hilbert-Huang transform[J].Power System Protection and Control,2012,40(2):88-92(in Chinese).
[8]贾惠彬,苏思岚,李明舒,等.考虑线路参数频变特性的小波域行波信号奇异性增强方法[J].电工技术学报,2017,32(15):153-160.Jia Huibin,Su Silan,Li Mingshu,et al.A singularity enhancement method in wavelet domain for traveling-wave with considering frequency characteristic of line parameter[J].Transactions of China Electrotechnical Society,2017,32(15):153-160(in Chinese).
[9]Zhang X,Tai N,Wang Y,et al.EMTR-based fault location for DCline in VSC-MTDC system using high-frequency currents[J].IETGeneration Transmission&Distribution,2017,11(10):2499-2507.
[10]Tang L,Ooi B T.Locating and isolating DC faults in multi-terminal DC systems[J].IEEE Transactions on Power Delivery,2007,22(3):1877-1884.
[11]陈玥云,覃剑,王欣,等.配电网故障测距综述[J].电网技术,2006,30(18):89-93.Chen Yueyun,Qin Jian,Wang Xin,et al.A survey on fault location for distribution network[J].Power System Technology,2006,30(18):89-93(in Chinese).
[12]崔浩,王丰华,穆卡,等.基于实际波速的多端输电线路行波故障测距方法[J].电工电能新技术,2017,36(2):74-80.Cui Hao,Wang Fenghua,Mu Ka,et al.Real-time velocity based fault location method of travelling wave for multi-terminal transmission lines[J].Advanced Technology of Electrical Engineering and Energy,2017,36(2):74-80(in Chinese).
[13]许珉,杨艳伟,申克运,等.基于小波变换的电缆短距离开路故障测距[J].电力系统保护与控制,2013,41(4):112-116.Xu Min,Yang Yanwei,Shen Keyun,et al.Cable short open-circuit fault location based on wavelet transform[J].Power System Protection and Control,2013,41(4):112-116(in Chinese).
[14]和敬涵,张明,罗国敏,等.一种利用故障暂态过程的柔性直流配电网故障测距方法[J].电网技术,2017,41(3):985-992.He Jinghan,Zhang Ming,Luo Guomin,et al.A fault location method for flexible DC distribution network based on fault transient process[J].Power System Technology,2017,41(3):985-992(in Chinese).
[15]Hagh M T,Razi K,Taghizadeh H.Fault classification and location of power transmission lines using artificiall neural network[C]//International Power Engineering Conference.Singapore:IEEE,2008:1109-1114.
[16]Park J D,Candelaria J,Ma L,et al.DC ring-bus microgrid fault protection and identification of fault location[J].IEEE Transactions on Power Delivery,2013,28(4):2574-2584.
[17]李斌,何佳伟.柔性直流配电系统故障分析及限流方法[J].中国电机工程学报,2015,35(12):3026-3036.Lin Bin,He Jiawei.DC fault analysis and current limiting technique for VSC-based DC distribution system[J].Proceedings of the CSEE,2015,35(12):3026-3036(in Chinese).
[18]Mohanty R,Balaji U S M,Pradhan A KAn.Accurate noniterative fault-location technique for low-voltage DC microgrid[J].IEEETransactions on Power Delivery,2016,31(2):475-481.
[19]王帅,毕天姝,贾科.基于主动脉冲的MMC-HVDC单极接地故障测距[J].电工技术学报,2017,32(1):12-19.Wang Shuai,Bi Tianshu,Jia Ke.Single terminal fault location for MMC-HVDC transmission line using active pulse[J].Transactions of China Electrotechnical Society,2017,32(1):12-19(in Chinese).
[20]李德坤,宋国兵,高淑萍,等.VSC-HVDC输电线路单端行波自动化故障定位方法研究[J].电网技术,2013,37(4):1128-1133.Li Dekun,Song Guobing,Gao Shuping,et al.Study on automatic fault location for VSC-HVDC transmission lines based on one-terminal traveling wave[J].Power System Technology,2013,37(4):1128-1133(in Chinese).