CN105576623A - 一种基于时差法的自适应半波长线路差动保护方法 - Google Patents
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
- H02H3/042—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned combined with means for locating the fault
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/28—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
- H02H3/30—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus using pilot wires or other signalling channel
- H02H3/305—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus using pilot wires or other signalling channel involving current comparison
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/226—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for wires or cables, e.g. heating wires
Abstract
本发明涉及一种基于时差法的自适应半波长线路差动保护方法;由于半波长输电的电气距离长,发生故障后线路两侧的保护启动元件的动作时间有明显时差,根据波的传播原理,可以通过两侧保护启动元件的动作时间差估算故障点的位置。根据长线方程可以将线路两侧保护安装处的电压电流补偿到故障点,得到故障点处的电流值,再计算差动电流。由于线路不同点处发生故障差动保护判据的灵敏度不同,根据故障点位置的不同自适应改变差动保护的制动系数及门槛值,保证差动保护对线路全线具有灵敏度。
Description
技术领域:
本发明涉及继电保护领域,更具体涉及一种基于时差法的自适应半波长线路差动保护方法。
背景技术:
半波长交流输电(HalfWavelengthACTransmission/HWACT)是指输电的电气距离接近一个工频半波,即3000公里(50周)或2600公里(60周)的超远距离的三相交流输电。这种超长距离的交流输电与中等长度(数百公里)的交流输电相比,有一些截然不同的特性和显著的优点,如无需安装无功补偿设备;无需设中间开关站;过电压水平不高;经济性极佳等。要实现半波输电的工程应用,需要对线路的继电保护技术进行进一步研究。
电流差动保护作为中等长度交流输电线路的主保护应用非常广泛,但是对于半波长输电线路沿线各处电压差别不能忽略,传统的电容电流补偿方法不再适用,针对该问题,本发明提出了一种基于时差法的自适应半波长线路差动保护方法。
发明内容:
本发明的目的是提供一种基于时差法的自适应半波长线路差动保护方法,根据故障点位置的不同自适应改变差动保护的制动系数及门槛值,保证差动保护对线路全线具有灵敏度。
为实现上述目的,本发明采用以下技术方案:一种基于时差法的自适应半波长线路差动保护方法,包括:
1)估算半波长输电线路的故障点;
2)确定故障点处的电流;
3)根据故障点LFM自适应改变制动系数和门槛值。
所述步骤1)中利用时差法估算所述故障点;根据时差法保护启动元件的动作时间确定线路两侧保护启动元件动作时间TM和TN,从而估算故障位置。
所述时差法保护启动元件判据如下式(1)所示:
式中,ΔiA(t)、ΔiB(t)和ΔiC(t)分别为A、B、C三相电流的突变量;Δf(t)为电流突变量的平方和函数;fset为电流整定值。
按下式计算所述动作时间TM和TN:
LFM=((TM-TN)v光+L)/2(2)
式中,LFM为故障点距离线路M侧的距离,L为半波长线路长度3000km,v光为光的传播速度。
在所述步骤2)中,根据长线方程确定故障点处的电流,以故障点LFM为补偿点,利用长线方程进行补偿。
按下式确定所述故障点的电流:
式中,x=LFM;Ix+和Ix-为补偿处的电流;UM、UN、IM和IN分别为线路M侧和N侧电压和电流的相量值;Zc为线路的波阻抗;γ为线路的传播常数。
所述补偿点的电流Ix+和Ix-根据下式进行电流差动:
式中,k为制动系数,Iset为差动电流门槛值。
按下式自适应改变制动系数k和差动电流门槛值Iset:
和最接近的现有技术比,本发明提供技术方案具有以下优异效果:
利用基于时差法的自适应半波长线路差动保护方法,解决了由于半波长输电的电气距离长,发生故障后线路两侧的保护启动元件的动作时间有明显时差的问题;其根据波的传播原理,可以通过两侧保护启动元件的动作时间差估算故障点的位置,从而得到故障点处的电流值,再计算差动电流。由于线路不同点处发生故障差动保护判据的灵敏度不同,根据故障点位置的不同自适应改变差动保护的制动系数及门槛值,保证差动保护对线路全线具有灵敏度,减小了半波长线路的故障的发生,降低了该故障带了的损失和不便。
附图说明
图1为本发明实施例的方法流程图;
图2为本发明实施例的自适应改变差动保护制动系数和门槛值示意图。
具体实施方式
下面结合实施例对发明作进一步的详细说明。
实施例1:
本例的发明提出一种基于时差法的自适应半波长线路差动保护方法,其步骤如图1所示:
(1)时差法保护启动元件动作时间为保护元件感受到故障发生的时间,可以得到线路两侧保护启动元件动作时间TM、TN。时差法保护启动判据:
(2)利用时差法估算故障位置LFM:
LFM=((TM-TN)v光+L)2(2)
(3)以故障点LFM为补偿点,利用长线方程进行补偿,得到补偿点处的电流Ix+、Ix-:
(4)利用Ix+和Ix-进行电流差动:
(5)自适应确定电流差动判据中的制动系数和门槛值,如图2所示:
最后应当说明的是:以上实施例仅用以说明本发明的技术方案而非对其限制,所属领域的普通技术人员尽管参照上述实施例应当理解:依然可以对本发明的具体实施方式进行修改或者等同替换,这些未脱离本发明精神和范围的任何修改或者等同替换,均在申请待批的本发明的权利要求保护范围之内。
Claims (8)
1.一种基于时差法的自适应半波长线路差动保护方法,其特征在于:包括:
1)估算半波长输电线路的故障点;
2)确定故障点的电流;
3)根据故障点位置的不同自适应改变制动系数和门槛值。
2.如权利要求1所述的一种基于时差法的自适应半波长线路差动保护方法,其特征在于:所述步骤1)中利用时差法估算所述故障点;根据时差法保护启动元件的动作时间确定线路两侧保护启动元件动作时间TM和TN,从而估算故障位置。
3.如权利要求2所述的自适应半波长线路差动保护方法,其特征在于:所述时差法保护启动元件判据如下式(1)所示:
式中,ΔiA(t)、ΔiB(t)和ΔiC(t)分别为A、B、C三相电流的突变量;Δf(t)为电流突变量的平方和函数;fset为电流整定值。
4.如权利要求2或3所述的一种基于时差法的自适应半波长线路差动保护方法,其特征在于:按下式计算所述动作时间TM和TN:
LFM=((TM-TN)v光+L)/2(2)
式中,LFM为故障点距离线路M侧的距离,L为半波长线路长度3000km,v光为光的传播速度。
5.如权利要求1所述的一种基于时差法的自适应半波长线路差动保护方法,其特征在于:在所述步骤2)中,根据长线方程确定故障点处的电流,以故障点LFM为补偿点,利用长线方程进行补偿。
6.如权利要求5所述的一种基于时差法的自适应半波长线路差动保护方法,其特征在于:按下式确定所述故障点的电流:
式中,x=LFM;Ix+和Ix-为补偿处的电流;UM、UN、IM和IN分别为线路M侧和N侧电压和电流的相量值;Zc为线路的波阻抗;γ为线路的传播常数。
7.如权利要求6所述的一种基于时差法的自适应半波长线路差动保护方法,其特征在于:所述补偿点的电流Ix+和Ix-根据下式进行电流差动:
式中,k为制动系数,Iset为差动电流门槛值。
8.如权利要求7所述的一种基于时差法的自适应半波长线路差动保护方法,其特征在于:按下式自适应改变制动系数k和差动电流门槛值Iset:
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US16/062,515 US10985547B2 (en) | 2016-01-29 | 2016-07-11 | Current differential protection method for self-adaptive half-wavelength line based on time-difference method |
PCT/CN2016/089672 WO2017128631A1 (zh) | 2016-01-29 | 2016-07-11 | 基于时差法的自适应半波长线路电流差动保护方法 |
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WO2017128631A1 (zh) * | 2016-01-29 | 2017-08-03 | 中国电力科学研究院 | 基于时差法的自适应半波长线路电流差动保护方法 |
US10985547B2 (en) | 2016-01-29 | 2021-04-20 | China Electric Power Research Institute Company Limited | Current differential protection method for self-adaptive half-wavelength line based on time-difference method |
CN106356822A (zh) * | 2016-10-10 | 2017-01-25 | 许继集团有限公司 | 一种半波长输电线路的欠范围组合式保护方法与装置 |
CN106356822B (zh) * | 2016-10-10 | 2019-02-05 | 许继集团有限公司 | 一种半波长输电线路的欠范围组合式保护方法与装置 |
CN107359599A (zh) * | 2017-07-20 | 2017-11-17 | 许继集团有限公司 | 一种差动电流时差修正方法、装置及差动保护方法、装置 |
CN107359599B (zh) * | 2017-07-20 | 2019-04-09 | 许继集团有限公司 | 一种差动电流时差修正方法、装置及差动保护方法、装置 |
CN107394766A (zh) * | 2017-07-31 | 2017-11-24 | 天津大学 | 一种适用于半波长输电线路的过电压限制方法 |
CN107394766B (zh) * | 2017-07-31 | 2018-07-17 | 天津大学 | 一种适用于半波长输电线路的过电压限制方法 |
CN107482597A (zh) * | 2017-08-16 | 2017-12-15 | 南京国电南自电网自动化有限公司 | 一种半波长输电线路时差纵联方向保护方法 |
CN107482597B (zh) * | 2017-08-16 | 2019-12-10 | 南京国电南自电网自动化有限公司 | 一种半波长输电线路时差纵联方向保护方法 |
CN110501557A (zh) * | 2019-09-18 | 2019-11-26 | 南京国电南自电网自动化有限公司 | 一种防电磁干扰的保护快速启动方法及系统 |
CN110501557B (zh) * | 2019-09-18 | 2021-07-30 | 南京国电南自电网自动化有限公司 | 一种防电磁干扰的保护快速启动方法及系统 |
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US20180375322A1 (en) | 2018-12-27 |
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WO2017128631A1 (zh) | 2017-08-03 |
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