WO2017128613A1 - 一种用于半波长输电线路的伴随阻抗保护方法 - Google Patents

一种用于半波长输电线路的伴随阻抗保护方法 Download PDF

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Publication number
WO2017128613A1
WO2017128613A1 PCT/CN2016/087824 CN2016087824W WO2017128613A1 WO 2017128613 A1 WO2017128613 A1 WO 2017128613A1 CN 2016087824 W CN2016087824 W CN 2016087824W WO 2017128613 A1 WO2017128613 A1 WO 2017128613A1
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Prior art keywords
transmission line
wavelength transmission
protection device
relay protection
phase
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Ceased
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PCT/CN2016/087824
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English (en)
French (fr)
Inventor
杜丁香
柳焕章
周泽昕
梁旭明
郭雅蓉
王兴国
李连海
王德林
李肖
陈祥文
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China Electric Power Research Institute Co Ltd CEPRI
Central China Branch of State Grid Corporation of China
State Grid Corp of China SGCC
Original Assignee
China Electric Power Research Institute Co Ltd CEPRI
Central China Branch of State Grid Corporation of China
State Grid Corp of China SGCC
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Priority to US15/781,079 priority Critical patent/US10605852B2/en
Publication of WO2017128613A1 publication Critical patent/WO2017128613A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G01R19/2513—Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging
    • 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

Definitions

  • the present invention relates to the field of power system relay protection, and in particular to a method for accompanying impedance protection for a half-wavelength transmission line.
  • the half-wavelength AC transmission system is a new type of transmission system with a transmission distance of 3,000 km (50 Hz) or 2,600 km (60 Hz). Compared with conventional AC transmission, half-wavelength transmission has the advantages of not requiring the installation of reactive power compensation equipment, excellent economy, and no need to install intermediate switch stations, so it is a promising power transmission method.
  • the obtained impedance can correctly reflect the characteristics of the line fault, and can be quickly and reliably operated after the fault, so it is widely used as a kind of rapid protection in the transmission line.
  • the half-wavelength transmission line has a very long transmission distance, a large distributed capacitance, and no reactive power compensation equipment is installed on the line.
  • the voltage along the line varies greatly.
  • the impedance obtained according to the conventional distance protection principle cannot completely reflect the line fault characteristic.
  • the formed distance protection fails to operate correctly in the fault area outside the line, so the conventional conventional distance protection cannot be applied to the half-wavelength transmission line.
  • embodiments of the present invention are directed to a method for accompanying impedance protection for a half-wavelength transmission line, the purpose of which is to locate a fault by using a time difference method according to characteristics during a fault, and compensate for voltage and current on both sides of the line.
  • the accompanying impedance is constructed, and the faults in the line area can be correctly reflected. Since the double-ended quantity electrical information is effectively utilized along with the impedance protection, the fault can be quickly and reliably operated in the line area, and the fault outside the line area is not disturbed, and Protection has a higher sensitivity.
  • a method for accompanying impedance protection for a half-wavelength transmission line comprising:
  • Step (1) respectively obtaining a three-phase current and a three-phase voltage of the relay protection device installation portion M of the half-wavelength transmission line and the installation protection portion N of the relay protection device, wherein the relay protection device installation portion M and the The installation points of the relay protection devices are opposite to each other;
  • Step (2) determining whether the starting amount of the relay protection device mounting portion M of the half-wavelength transmission line and the mounting position N of the relay protection device meets the starting condition, and if yes, executing step (3), and if not, ending operating;
  • Step (3) determining the fault point F according to the time difference between the start-up amount of the relay protection device installation portion M of the half-wavelength transmission line and the installation position N of the relay protection device meeting the start condition;
  • Step (4) respectively determining the compensation current and the compensation voltage at the installation point M of the relay protection device of the half-wavelength transmission line and the installation point N of the relay protection device to the fault point F;
  • Step (5) determining an accompanying impedance of the half-wavelength transmission line
  • Step (6) the steady-state impedance and the variation impedance of the half-wavelength transmission line constitute a companion impedance of the half-wavelength transmission line, and the half-wavelength transmission line is opened according to the accompanying impedance of the half-wavelength transmission line. Relay protection action.
  • the starting condition formula of the M-side relay protection device of the half-wavelength transmission line is:
  • ⁇ f M ( ⁇ i Ma - ⁇ i Mb ) 2 +( ⁇ i Mb - ⁇ i Mc ) 2 +( ⁇ i Mc - ⁇ i Ma ) 2 >f Mset (1)
  • ⁇ f M is the starting amount of the relay protection device mounting portion M of the half-wavelength power transmission line
  • ⁇ i Ma is the current phase A phase current of the relay protection device mounting portion M of the half-wavelength power transmission line
  • ⁇ i Mb is the amount of change of the current phase B phase current and the pre-cycle B phase current of the relay protection device installation portion M of the half-wavelength transmission line
  • ⁇ i Mc is the half wavelength
  • f Mset is the starting value of the installation position M of the relay protection device of the half-wavelength transmission line ;
  • the starting condition formula of the installation side of the N-side relay protection device of the half-wavelength transmission line is:
  • ⁇ f N ( ⁇ i Na - ⁇ i Nb ) 2 +( ⁇ i Nb - ⁇ i Nc ) 2 +( ⁇ i Nc - ⁇ i Na ) 2 >f Nset (2)
  • ⁇ f N is the starting amount of the relay protection device N of the half-wavelength transmission line
  • ⁇ i Na is the current phase A phase current of the relay protection device installation portion N of the half-wavelength transmission line a change amount of the pre-cycle A-phase current
  • ⁇ i Nb is the change amount of the current phase B phase current and a pre-cycle B phase current at the installation position N of the half-wavelength transmission line
  • ⁇ i Nc is the half wavelength C-phase current time with one cycle before the change amount C of the N-phase current protection device is mounted at the apparatus mounting at a relay transmission line current
  • f Nset of the half-wavelength transmission line protection device is mounted at the N Start amount setting.
  • the relay protection device mounting portion M of the half-wavelength transmission line is located inside the relay protection device M of the half-wavelength transmission line, and the fault point F is determined.
  • the formula is:
  • x' is the distance from the mounting position M of the relay protection device of the half-wavelength transmission line to the fault point F
  • L is the length of the half-wavelength transmission line
  • c is the speed of light
  • the relay protection of the half-wavelength transmission line is set.
  • the device mounting portion M is located inside the relay protection device N of the half-wavelength transmission line, and then determines the compensation current and the compensation voltage at the installation point M of the half-wavelength transmission line to the fault point F.
  • the formula is:
  • I MX- is the X-phase compensation current at the installation point M of the relay protection device of the half-wavelength transmission line to the fault point F
  • I MX is the relay protection device of the half-wavelength transmission line.
  • the X-phase current of the installation M, U MX- is the compensation phase of the relay protection device M of the half-wavelength transmission line to the X-phase compensation voltage at the fault point F
  • U MX is the relay of the half-wavelength transmission line
  • the X-phase voltage of the protection device installation M, x' is the distance from the installation position M of the relay protection device of the half-wavelength transmission line to the fault point F
  • For the wave impedance of the half-wavelength transmission line, Y 0 is the unit length admittance of the half-wavelength transmission line, and Z 0 is the unit length impedance of the half-wavelength transmission line, X ⁇ A, B, C ⁇ , Wherein, when x'>L,
  • I NX+ compensates for the X-phase compensation current at the fault point F of the relay protection device installation portion of the half-wavelength transmission line
  • I NX is the relay protection device installation of the half-wavelength transmission line
  • U NX+ compensates the X-phase compensation voltage at the fault point F of the relay protection device installation N of the half-wavelength transmission line
  • U NX is the relay protection device of the half-wavelength transmission line
  • the X-phase voltage of the installation N, x' is the distance from the relay protection device mounting portion M of the half-wavelength transmission line to the fault point F.
  • x' takes L
  • L is the Half-wavelength transmission line length, when x' ⁇ 0, x' takes 0.
  • determining the accompanying impedance of the half-wavelength transmission line includes:
  • Z X ⁇ is the X-phase steady-state impedance of the half-wavelength transmission line
  • I NX+ is the X-phase compensation at the installation point N of the half-wavelength transmission line to the fault point F.
  • Current U NX+ compensates for the X-phase compensation voltage at the fault point F of the relay protection device installation N of the half-wavelength transmission line
  • I MX- is the M compensation for the installation of the relay protection device of the half-wavelength transmission line
  • U MX- compensates the X-phase compensation voltage at the fault point F for the relay protection device installation of the half-wavelength transmission line, X ⁇ A, B, C ⁇ ;
  • ⁇ Z X ⁇ is the X-phase variation impedance of the half-wavelength transmission line
  • ⁇ U NX+ is the X-phase compensation voltage at the installation point N of the half-wavelength transmission line to compensate the fault point F
  • ⁇ U MX- is the amount of X-phase compensation voltage change at the installation point M of the relay protection device of the half-wavelength transmission line to the fault point F
  • ⁇ I NX+ is the relay protection device installation of the half-wavelength transmission line compensating current change amount X with respect to the compensation of the N fault at point F
  • ⁇ I MX- compensation current change amount X of M phase compensating means is mounted at said relay to a half wavelength transmission line at the fault point F.
  • the calculation formula of the X-phase compensation voltage variation ⁇ U NX+ at the installation point N of the half-wavelength transmission line to the fault point F is:
  • the U NX+ compensates the X-phase compensation voltage at the fault point F of the relay protection device N of the half-wavelength transmission line, Compensating for the X-phase compensation voltage before the cycle at the fault point F for the relay protection device installation N of the half-wavelength transmission line, X ⁇ A, B, C ⁇ ;
  • U MX- is the X-phase compensation voltage at the installation point M of the relay protection device of the half-wavelength transmission line to the fault point F, Compensating for the X-phase compensation voltage of a pre-cycle at the fault point F for the relay protection device mounting portion M of the half-wavelength transmission line;
  • I NX+ is the X-phase compensation current at the installation point N of the relay protection device of the half-wavelength transmission line to the fault point F, Compensating for the X-phase compensation current before the cycle at the fault point F for the relay protection device installation N of the half-wavelength transmission line;
  • I MX- is the X-phase compensation current at the installation point M of the relay protection device of the half-wavelength transmission line to the fault point F,
  • the relay protection device installation M of the half-wavelength transmission line compensates for a pre-cycle X-phase compensation current at the fault point F.
  • the steady-state impedance and the variation impedance of the half-wavelength transmission line constitute a companion impedance of the half-wavelength transmission line, according to the half-wavelength transmission.
  • the relay protection action of the half-wavelength transmission line with the accompanying impedance of the electric circuit includes:
  • ⁇ Z set is the value of the X-phase variation impedance of the half-wavelength transmission line, X ⁇ A, B, C ⁇ .
  • the present invention provides one
  • the accompanying impedance protection method for a half-wavelength transmission line can locate the fault by using the time difference method according to the characteristics of the fault period, and compensate the impedance with the voltage and current on both sides of the line to correctly reflect the fault in the line area and outside. Since the double-ended electrical information is effectively utilized along with the impedance protection, the fault can be quickly and reliably operated in the line region, the fault outside the line region is not disturbed, and the protection has high sensitivity.
  • FIG. 1 is a flow chart of a method for accompanying impedance protection for a half-wavelength transmission line in an embodiment of the present invention
  • FIG. 2 is a schematic diagram of an application scenario of a companion impedance protection method for a half-wavelength transmission line in an embodiment of the present invention.
  • a method for accompanying impedance protection for a half-wavelength transmission line provided by the present invention, as shown in FIG. 1, includes:
  • Step (1) respectively obtaining a three-phase current and a three-phase voltage of the relay protection device installation portion M of the half-wavelength transmission line and the installation protection portion N of the relay protection device, wherein the relay protection device installation portion M and the The installation points of the relay protection devices are opposite to each other;
  • Step (2) determining whether the starting amount of the relay protection device mounting portion M of the half-wavelength transmission line and the mounting position N of the relay protection device meets the starting condition, and if yes, executing step (3), and if not, ending operating;
  • Step (3) determining the fault point F according to the time difference between the start-up amount of the relay protection device installation portion M of the half-wavelength transmission line and the installation position N of the relay protection device meeting the start condition;
  • Step (4) respectively determining the compensation current and the compensation voltage at the installation point M of the relay protection device of the half-wavelength transmission line and the installation point N of the relay protection device to the fault point F;
  • Step (5) determining an accompanying impedance of the half-wavelength transmission line
  • Step (6) the steady-state impedance and the variation impedance of the half-wavelength transmission line constitute a companion impedance of the half-wavelength transmission line, and the half-wavelength transmission line is opened according to the accompanying impedance of the half-wavelength transmission line. Relay protection action.
  • the starting condition formula of the M-side relay protection device of the half-wavelength transmission line is:
  • ⁇ f M ( ⁇ i Ma - ⁇ i Mb ) 2 +( ⁇ i Mb - ⁇ i Mc ) 2 +( ⁇ i Mc - ⁇ i Ma ) 2 >f Mset (1)
  • ⁇ f M is the starting amount of the relay protection device mounting portion M of the half-wavelength power transmission line
  • ⁇ i Ma is the current phase A phase current of the relay protection device mounting portion M of the half-wavelength power transmission line
  • ⁇ i Mb is the amount of change of the current phase B phase current and the pre-cycle B phase current of the relay protection device installation portion M of the half-wavelength transmission line
  • ⁇ i Mc is the half wavelength
  • f Mset is the starting value of the installation position M of the relay protection device of the half-wavelength transmission line ;
  • one cycle is 20ms
  • the starting condition formula of the installation side of the N-side relay protection device of the half-wavelength transmission line is:
  • ⁇ f N ( ⁇ i Na - ⁇ i Nb ) 2 +( ⁇ i Nb - ⁇ i Nc ) 2 +( ⁇ i Nc - ⁇ i Na ) 2 >f Nset (2)
  • ⁇ f N is the starting amount of the relay protection device N of the half-wavelength transmission line
  • ⁇ i Na is the current phase A phase current of the relay protection device installation portion N of the half-wavelength transmission line a change amount of the pre-cycle A-phase current
  • ⁇ i Nb is the change amount of the current phase B phase current and a pre-cycle B phase current at the installation position N of the half-wavelength transmission line
  • ⁇ i Nc is the half wavelength
  • the relay protection device of the transmission line is installed at the installation location of the N relay protection device.
  • the current phase C current and the change of the C-phase current before the cycle, f Nset is the installation position of the relay protection device of the half-wavelength transmission line N Start amount setting.
  • the relay protection device mounting portion M of the half-wavelength transmission line is located inside the installation protection portion M of the half-wavelength transmission line, and the fault point F is determined.
  • the formula is:
  • x' is the distance from the mounting position M of the relay protection device of the half-wavelength transmission line to the fault point F
  • L is the length of the half-wavelength transmission line
  • c is the speed of light
  • the M position of the relay protection device of the half-wavelength transmission line is set.
  • the formula for determining the compensation current and the compensation voltage at the installation point M of the half-wavelength transmission line to the fault point F is:
  • I MX- is the X-phase compensation current at the installation point M of the relay protection device of the half-wavelength transmission line to the fault point F
  • I MX is the relay protection device of the half-wavelength transmission line.
  • the X-phase current of the installation M, U MX- is the compensation phase of the relay protection device M of the half-wavelength transmission line to the X-phase compensation voltage at the fault point F
  • U MX is the relay of the half-wavelength transmission line
  • the X-phase voltage of the protection device installation M, x' is the distance from the installation position M of the relay protection device of the half-wavelength transmission line to the fault point F
  • For the wave impedance of the half-wavelength transmission line, Y 0 is the unit length admittance of the half-wavelength transmission line, and Z 0 is the unit length impedance of the half-wavelength transmission line, X ⁇ A, B, C ⁇ , Wherein, when x'>L,
  • I NX+ compensates for the X-phase compensation current at the fault point F of the relay protection device installation portion of the half-wavelength transmission line
  • I NX is the relay protection device installation of the half-wavelength transmission line
  • U NX+ compensates the X-phase compensation voltage at the fault point F of the relay protection device installation N of the half-wavelength transmission line
  • U NX is the relay protection device of the half-wavelength transmission line
  • the X-phase voltage of the installation N, x' is the distance from the relay protection device mounting portion M of the half-wavelength transmission line to the fault point F.
  • x' takes L
  • L is the Half-wavelength transmission line length, when x' ⁇ 0, x' takes 0.
  • determining the accompanying impedance of the half-wavelength transmission line includes:
  • Z X ⁇ is the X-phase steady-state impedance of the half-wavelength transmission line
  • I NX+ is the X-phase compensation at the installation point N of the half-wavelength transmission line to the fault point F.
  • Current U NX+ compensates for the X-phase compensation voltage at the fault point F of the relay protection device installation N of the half-wavelength transmission line
  • I MX- is the M compensation for the installation of the relay protection device of the half-wavelength transmission line
  • U MX- compensates the X-phase compensation voltage at the fault point F for the relay protection device installation of the half-wavelength transmission line, X ⁇ A, B, C ⁇ ;
  • ⁇ Z X ⁇ is the X-phase variation impedance of the half-wavelength transmission line
  • ⁇ U NX+ is the X-phase compensation voltage at the installation point N of the half-wavelength transmission line to compensate the fault point F
  • ⁇ U MX- is the amount of X-phase compensation voltage change at the installation point M of the relay protection device of the half-wavelength transmission line to the fault point F
  • ⁇ I NX+ is the relay protection device installation of the half-wavelength transmission line
  • the N compensates to the X-phase compensation current change amount at the fault point F
  • ⁇ I MX- is the X-phase compensation current change amount at the fault protection point F of the relay protection device installation portion M of the half-wavelength transmission line.
  • the U NX+ compensates the X-phase compensation voltage at the fault point F of the relay protection device N of the half-wavelength transmission line, Compensating for the X-phase compensation voltage before the cycle at the fault point F for the relay protection device installation N of the half-wavelength transmission line, X ⁇ A, B, C ⁇ ;
  • U MX- is the X-phase compensation voltage at the installation point M of the relay protection device of the half-wavelength transmission line to the fault point F, Compensating for the X-phase compensation voltage of a pre-cycle at the fault point F for the relay protection device mounting portion M of the half-wavelength transmission line;
  • I NX+ is the X-phase compensation current at the installation point N of the relay protection device of the half-wavelength transmission line to the fault point F, Compensating for the X-phase compensation current before the cycle at the fault point F for the relay protection device installation N of the half-wavelength transmission line;
  • I MX- M compensating apparatus is installed at the half-wavelength transmission line protection to X at the fault point F phase compensation current,
  • the relay protection device installation M of the half-wavelength transmission line compensates for a pre-cycle X-phase compensation current at the fault point F.
  • the steady-state impedance and the variation impedance of the half-wavelength transmission line constitute a companion impedance of the half-wavelength transmission line, and the half-wavelength is opened according to the accompanying impedance of the half-wavelength transmission line.
  • the relay protection actions of the transmission line include:
  • ⁇ Z set is the value of the X-phase variation impedance of the half-wavelength transmission line, X ⁇ A, B, C ⁇ .
  • Step (1) respectively obtaining a three-phase current and a three-phase voltage of the relay protection device installation portion M of the half-wavelength transmission line and the installation protection portion N of the relay protection device, wherein the relay protection device installation portion M and the The installation points of the relay protection devices are opposite to each other;
  • Step (2) determining whether the starting amount of the relay protection device mounting portion M of the half-wavelength transmission line and the mounting position N of the relay protection device meets the starting condition, and if yes, executing step (3), and if not, ending operating;
  • Step (3) determining the fault point F according to the time difference between the start-up amount of the relay protection device installation portion M of the half-wavelength transmission line and the installation position N of the relay protection device meeting the start condition;
  • Step (4) respectively determining the compensation current and the compensation voltage at the installation point M of the relay protection device of the half-wavelength transmission line and the installation point N of the relay protection device to the fault point F;
  • Step (5) determining an accompanying impedance of the half-wavelength transmission line
  • Step (6) consisting of a steady-state impedance and a varying impedance of the half-wavelength transmission line
  • the accompanying impedance of the half-wavelength transmission line is used to open the relay protection operation of the half-wavelength transmission line according to the accompanying impedance of the half-wavelength transmission line.
  • the fault can be located by the time difference method according to the characteristics of the fault period, and the accompanying impedance can be constructed by compensating the voltage and current on both sides of the line, and the fault in the line region can be accurately reflected, and the double end is effectively utilized due to the impedance protection.
  • the electrical information is measured, so that the fault can be quickly and reliably operated in the line area, the fault outside the line area is not disturbed, and the protection has high sensitivity.

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Abstract

一种用于半波长输电线路的伴随阻抗保护方法，包括：分别获取半波长输电线路的M侧继电保护装置安装处和N侧继电保护装置安装处的三相电流及三相电压；判断M侧和N侧的启动量是否满足启动条件；根据M侧和N侧启动量满足启动条件的时间差确定故障点F；根据半波长输电线路的伴随阻抗开放半波长输电线路的继电保护动作。该方法能够根据故障期间特性，利用时差法对故障进行定位，通过对线路两侧电压、电流进行补偿构造了伴随阻抗，正确地反映线路区内外故障，由于伴随阻抗保护有效地利用了双端量电气信息，因而在线路区内故障能够快速可靠地动作，线路区外故障不会误动，且保护具有较高的灵敏度。

Description

一种用于半波长输电线路的伴随阻抗保护方法 技术领域
本发明涉及电力系统继电保护领域，具体涉及一种用于半波长输电线路的伴随阻抗保护方法。
背景技术
半波长交流输电系统属于一种新型的输电系统，其输电距离为3000公里(50Hz)或2600公里(60Hz)。与常规交流输电相比，半波长输电具有不需要安装无功补偿设备、经济型极佳、无需装设中间开关站等优点，因而是一种极具潜力的输电方式。
在传统的输电线路上，由于距离保护原理上比较简单，求得的阻抗能正确反映线路故障后的特征，在故障后能快速可靠动作，因此在输电线路中作为一种快速保护得到广泛应用。
然而半波长输电线路输电距离极长，分布电容大且线路上不安装无功补偿设备，线路沿线电压变化极大，根据常规的距离保护原理求得的阻抗已完全不能反映线路故障特征，由此构成的距离保护在线路区内外发生故障不能正确动作，因此现有常规的距离保护已不能适用于半波长输电线路。
发明内容
有鉴于此，本发明实施例期望提供一种用于半波长输电线路的伴随阻抗保护方法，其目的是根据故障期间特性，利用时差法对故障进行定位，通过对线路两侧电压、电流进行补偿构造了伴随阻抗，能够正确地反映线路区内外故障，由于伴随阻抗保护有效地利用了双端量电气信息，因而在线路区内故障能够快速可靠地动作，线路区外故障不会误动，且保护具有较高的灵敏度。
本发明实施例的目的是采用下述技术方案实现的：
一种用于半波长输电线路的伴随阻抗保护方法，其改进之处在于，包括：
步骤(1)、分别获取半波长输电线路的继电保护装置安装处M和继电保护装置安装处N的三相电流及三相电压，其中，所述继电保护装置安装处M与所述继电保护装置安装处N互为对侧；
步骤(2)、判断所述半波长输电线路的继电保护装置安装处M和继电保护装置安装处N的启动量是否满足启动条件，若是，则执行步骤(3)，若否，则结束操作；
步骤(3)、根据所述半波长输电线路的继电保护装置安装处M和继电保护装置安装处N的启动量满足启动条件的时间差确定故障点F；
步骤(4)、分别确定所述半波长输电线路的继电保护装置安装处M和继电保护装置安装处N补偿到故障点F处的补偿电流及补偿电压；
步骤(5)、确定所述半波长输电线路的伴随阻抗；
步骤(6)、由所述半波长输电线路的稳态量阻抗和变化量阻抗组成所述半波长输电线路的伴随阻抗，根据所述半波长输电线路的伴随阻抗开放所述半波长输电线路的继电保护动作。
在一实施例中，所述步骤(2)中，所述半波长输电线路的M侧继电保护装置安装处的启动条件公式为：
ΔfM＝(ΔiMa-ΔiMb)2+(ΔiMb-ΔiMc)2+(ΔiMc-ΔiMa)2>fMset     (1)
式(1)中，ΔfM为所述半波长输电线路的继电保护装置安装处M的启动量，ΔiMa为所述半波长输电线路的继电保护装置安装处M当前时刻A相电流与一个周波前A相电流的变化量，ΔiMb为所述半波长输电线路的继电保护装置安装处M当前时刻B相电流与一个周波前B相电流的变化量，ΔiMc为所述半波长输电线路的继电保护装置安装处M安装处当前时刻C相电流 与一个周波前C相电流的变化量，fMset为所述半波长输电线路的继电保护装置安装处M的启动量定值；
所述半波长输电线路的N侧继电保护装置安装处的启动条件公式为：
ΔfN＝(ΔiNa-ΔiNb)2+(ΔiNb-ΔiNc)2+(ΔiNc-ΔiNa)2>fNset      (2)
式(2)中，ΔfN为所述半波长输电线路的继电保护装置安装处N的启动量，ΔiNa为所述半波长输电线路的继电保护装置安装处N当前时刻A相电流与一个周波前A相电流的变化量，ΔiNb为所述半波长输电线路的继电保护装置安装处N当前时刻B相电流与一个周波前B相电流的变化量，ΔiNc为所述半波长输电线路的继电保护装置安装处N继电保护装置安装处当前时刻C相电流与一个周波前C相电流的变化量，fNset为所述半波长输电线路的继电保护装置安装处N的启动量定值。
在一实施例中，所述步骤(3)中，设所述半波长输电线路的继电保护装置安装处M位于所述半波长输电线路的继电保护装置安装处M内侧，确定故障点F的公式为：
Figure PCTCN2016087824-appb-000001
式(3)中，x'为所述半波长输电线路的继电保护装置安装处M至所述故障点F的距离，L为所述半波长输电线路长度，c为光速，Δt为所述半波长输电线路的继电保护装置安装处M和继电保护装置安装处N的启动量满足启动条件的时间差，即Δt＝tM-tN，其中，tM为所述半波长输电线路的继电保护装置安装处M的启动量满足启动条件的时刻，tN为所述半波长输电线路的继电保护装置安装处N的启动量满足启动条件的时刻；
若0<x'<L，则故障发生在所述半波长输电线路区内；
若x'>L或x'<0，则故障发生在所述半波长输电线路区外。
在一实施例中，所述步骤(4)中，设所述半波长输电线路的继电保护 装置安装处M位于所述半波长输电线路的继电保护装置安装处N内侧，则确定由所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的补偿电流及补偿电压的公式为：
Figure PCTCN2016087824-appb-000002
式(4)中，IMX-为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电流，IMX为所述半波长输电线路的继电保护装置安装处M的X相电流，UMX-为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电压，UMX为所述半波长输电线路的继电保护装置安装处M的X相电压，x'为所述半波长输电线路的继电保护装置安装处M至所述故障点F的距离，
Figure PCTCN2016087824-appb-000003
为所述半波长输电线路的传播常数，
Figure PCTCN2016087824-appb-000004
为所述半波长输电线路的波阻抗，Y0为所述半波长输电线路的单位长度导纳，Z0为所述半波长输电线路的单位长度阻抗，X∈{A,B,C}，其中，当x'>L时，x'取L，L为所述半波长输电线路长度，当x'<0时，x'取0；
确定由所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的补偿电流及补偿电压的公式为：
Figure PCTCN2016087824-appb-000005
式(5)中，INX+为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电流，INX为所述半波长输电线路的继电保护装置安装处N的X相电流，UNX+为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电压，UNX为所述半波长输电线路的继电保护装置安装处N的X相电压，x'为所述半波长输电线路的继电保护装置安 装处M至所述故障点F的距离，当x'>L时，x'取L，L为所述半波长输电线路长度，当x'<0时，x'取0。
在一实施例中，所述步骤(5)中，确定所述半波长输电线路的伴随阻抗包括：
确定所述半波长输电线路的稳态量阻抗的公式为：
Figure PCTCN2016087824-appb-000006
式(6)中，ZXΣ为所述半波长输电线路的X相稳态量阻抗，INX+为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电流，UNX+为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电压，IMX-为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电流，UMX-为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电压，X∈{A,B,C}；
确定所述半波长输电线路的变化量阻抗的公式为：
Figure PCTCN2016087824-appb-000007
式(7)中，ΔZXΣ为所述半波长输电线路的X相变化量阻抗，ΔUNX+为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电压变化量，ΔUMX-为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电压变化量，ΔINX+为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电流变化量，ΔIMX-为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电流变化量。
在一实施例中，所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电压变化量ΔUNX+的计算公式为：
Figure PCTCN2016087824-appb-000008
式(8)中，UNX+为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电压，
Figure PCTCN2016087824-appb-000009
为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处一个周波前的X相补偿电压，X∈{A,B,C}；
所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电压变化量ΔUMX-的计算公式为：
Figure PCTCN2016087824-appb-000010
式(9)中，UMX-为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电压，
Figure PCTCN2016087824-appb-000011
为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处一个周波前的X相补偿电压；
所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电流变化量ΔINX+的计算公式为：
Figure PCTCN2016087824-appb-000012
式(10)中，INX+为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电流，
Figure PCTCN2016087824-appb-000013
为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处一个周波前的X相补偿电流；
所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电流变化量ΔIMX-的计算公式为：
Figure PCTCN2016087824-appb-000014
式(11)中，IMX-为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电流，
Figure PCTCN2016087824-appb-000015
为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处一个周波前的X相补偿电流。
在一实施例中，所述步骤(6)中，由所述半波长输电线路的稳态量阻抗和变化量阻抗组成所述半波长输电线路的伴随阻抗，根据所述半波长输 电线路的伴随阻抗开放所述半波长输电线路的继电保护动作包括：
当所述半波长输电线路的X相稳态量阻抗ZXΣ满足ZXΣ＜Zset，且所述半波长输电线路的X相变化量阻抗ΔZXΣ满足ΔZXΣ＜ΔZset时，所述半波长输电线路的X相启动继电保护动作，ΔZset为所述半波长输电线路的X相变化量阻抗定值，X∈{A,B,C}。
本发明的有益效果：
现有技术中，由于半波长输电线路很长，分布电容很大，电气特征独特，常规的单端量保护如距离保护等已不能区分线路区内外故障，因而不能正确动作，本发明提供的一种用于半波长输电线路的伴随阻抗保护方法，能够根据故障期间特性，利用时差法对故障进行定位，通过对线路两侧电压、电流进行补偿构造了伴随阻抗，能够正确地反映线路区内外故障，由于伴随阻抗保护有效地利用了双端量电气信息，因而在线路区内故障能够快速可靠地动作，线路区外故障不会误动，且保护具有较高的灵敏度。
附图说明
图1是本发明实施例中用于半波长输电线路的伴随阻抗保护方法的流程图；
图2是本发明实施例中半波长输电线路的伴随阻抗保护方法应用场景示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。
本发明提供的一种用于半波长输电线路的伴随阻抗保护方法，如图1所示，包括：
步骤(1)、分别获取半波长输电线路的继电保护装置安装处M和继电保护装置安装处N的三相电流及三相电压，其中，所述继电保护装置安装处M与所述继电保护装置安装处N互为对侧；
步骤(2)、判断所述半波长输电线路的继电保护装置安装处M和继电保护装置安装处N的启动量是否满足启动条件，若是，则执行步骤(3)，若否，则结束操作；
步骤(3)、根据所述半波长输电线路的继电保护装置安装处M和继电保护装置安装处N的启动量满足启动条件的时间差确定故障点F；
步骤(4)、分别确定所述半波长输电线路的继电保护装置安装处M和继电保护装置安装处N补偿到故障点F处的补偿电流及补偿电压；
步骤(5)、确定所述半波长输电线路的伴随阻抗；
步骤(6)、由所述半波长输电线路的稳态量阻抗和变化量阻抗组成所述半波长输电线路的伴随阻抗，根据所述半波长输电线路的伴随阻抗开放所述半波长输电线路的继电保护动作。
在一实施例中，所述步骤(2)中，所述半波长输电线路的M侧继电保护装置安装处的启动条件公式为：
ΔfM＝(ΔiMa-ΔiMb)2+(ΔiMb-ΔiMc)2+(ΔiMc-ΔiMa)2>fMset    (1)
式(1)中，ΔfM为所述半波长输电线路的继电保护装置安装处M的启动量，ΔiMa为所述半波长输电线路的继电保护装置安装处M当前时刻A相电流与一个周波前A相电流的变化量，ΔiMb为所述半波长输电线路的继电保护装置安装处M当前时刻B相电流与一个周波前B相电流的变化量，ΔiMc为所述半波长输电线路的继电保护装置安装处M安装处当前时刻C相电流与一个周波前C相电流的变化量，fMset为所述半波长输电线路的继电保护装 置安装处M的启动量定值；
其中，一个周波为20ms；
所述半波长输电线路的N侧继电保护装置安装处的启动条件公式为：
ΔfN＝(ΔiNa-ΔiNb)2+(ΔiNb-ΔiNc)2+(ΔiNc-ΔiNa)2>fNset    (2)
式(2)中，ΔfN为所述半波长输电线路的继电保护装置安装处N的启动量，ΔiNa为所述半波长输电线路的继电保护装置安装处N当前时刻A相电流与一个周波前A相电流的变化量，ΔiNb为所述半波长输电线路的继电保护装置安装处N当前时刻B相电流与一个周波前B相电流的变化量，ΔiNc为所述半波长输电线路的继电保护装置安装处N继电保护装置安装处当前时刻C相电流与一个周波前C相电流的变化量，fNset为所述半波长输电线路的继电保护装置安装处N的启动量定值。
所述步骤(3)中，如图2所示，设所述半波长输电线路的继电保护装置安装处M位于所述半波长输电线路的继电保护装置安装处M内侧，确定故障点F的公式为：
Figure PCTCN2016087824-appb-000016
式(3)中，x'为所述半波长输电线路的继电保护装置安装处M至所述故障点F的距离，L为所述半波长输电线路长度，c为光速，Δt为所述半波长输电线路的继电保护装置安装处M和继电保护装置安装处N的启动量满足启动条件的时间差，即Δt＝tM-tN，其中，tM为所述半波长输电线路的继电保护装置安装处M的启动量满足启动条件的时刻，tN为所述半波长输电线路的继电保护装置安装处N的启动量满足启动条件的时刻；
若0<x'<L，则故障发生在所述半波长输电线路区内；
若x'>L或x'<0，则故障发生在所述半波长输电线路区外。
所述步骤(4)中，设所述半波长输电线路的继电保护装置安装处M位 于所述半波长输电线路的继电保护装置安装处N内侧，则确定由所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的补偿电流及补偿电压的公式为：
Figure PCTCN2016087824-appb-000017
式(4)中，IMX-为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电流，IMX为所述半波长输电线路的继电保护装置安装处M的X相电流，UMX-为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电压，UMX为所述半波长输电线路的继电保护装置安装处M的X相电压，x'为所述半波长输电线路的继电保护装置安装处M至所述故障点F的距离，
Figure PCTCN2016087824-appb-000018
为所述半波长输电线路的传播常数，
Figure PCTCN2016087824-appb-000019
为所述半波长输电线路的波阻抗，Y0为所述半波长输电线路的单位长度导纳，Z0为所述半波长输电线路的单位长度阻抗，X∈{A,B,C}，其中，当x'>L时，x'取L，L为所述半波长输电线路长度，当x'<0时，x'取0；
确定由所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的补偿电流及补偿电压的公式为：
Figure PCTCN2016087824-appb-000020
式(5)中，INX+为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电流，INX为所述半波长输电线路的继电保护装置安装处N的X相电流，UNX+为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电压，UNX为所述半波长输电线路的继电保护装置安装处N的X相电压，x'为所述半波长输电线路的继电保护装置安 装处M至所述故障点F的距离，当x'>L时，x'取L，L为所述半波长输电线路长度，当x'<0时，x'取0。
所述步骤(5)中，确定所述半波长输电线路的伴随阻抗包括：
确定所述半波长输电线路的稳态量阻抗的公式为：
Figure PCTCN2016087824-appb-000021
式(6)中，ZXΣ为所述半波长输电线路的X相稳态量阻抗，INX+为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电流，UNX+为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电压，IMX-为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电流，UMX-为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电压，X∈{A,B,C}；
确定所述半波长输电线路的变化量阻抗的公式为：
Figure PCTCN2016087824-appb-000022
式(7)中，ΔZXΣ为所述半波长输电线路的X相变化量阻抗，ΔUNX+为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电压变化量，ΔUMX-为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电压变化量，ΔINX+为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电流变化量，ΔIMX-为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电流变化量。
其中，所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电压变化量ΔUNX+的计算公式为：
Figure PCTCN2016087824-appb-000023
式(8)中，UNX+为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电压，
Figure PCTCN2016087824-appb-000024
为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处一个周波前的X相补偿电压，X∈{A,B,C}；
所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电压变化量ΔUMX-的计算公式为：
Figure PCTCN2016087824-appb-000025
式(9)中，UMX-为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电压，
Figure PCTCN2016087824-appb-000026
为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处一个周波前的X相补偿电压；
所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电流变化量ΔINX+的计算公式为：
Figure PCTCN2016087824-appb-000027
式(10)中，INX+为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电流，
Figure PCTCN2016087824-appb-000028
为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处一个周波前的X相补偿电流；
所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电流变化量ΔIMX-的计算公式为：
Figure PCTCN2016087824-appb-000029
式(11)中，IMX-为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电流，
Figure PCTCN2016087824-appb-000030
为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处一个周波前的X相补偿电流。
所述步骤(6)中，由所述半波长输电线路的稳态量阻抗和变化量阻抗组成所述半波长输电线路的伴随阻抗，根据所述半波长输电线路的伴随阻抗开放所述半波长输电线路的继电保护动作包括：
当所述半波长输电线路的X相稳态量阻抗ZXΣ满足ZXΣ＜Zset，且所述半波长输电线路的X相变化量阻抗ΔZXΣ满足ΔZXΣ＜ΔZset时，所述半波长输电线路的X相启动继电保护动作，ΔZset为所述半波长输电线路的X相变化量阻抗定值，X∈{A,B,C}。
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，尽管参照上述实施例对本发明进行了详细的说明，所属领域的普通技术人员应当理解：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，而未脱离本发明精神和范围的任何修改或者等同替换，其均应涵盖在本发明的权利要求保护范围之内。
工业实用性
本发明实施例提供的用于半波长输电线路的伴随阻抗保护方法包括以下步骤：
步骤(1)、分别获取半波长输电线路的继电保护装置安装处M和继电保护装置安装处N的三相电流及三相电压，其中，所述继电保护装置安装处M与所述继电保护装置安装处N互为对侧；
步骤(2)、判断所述半波长输电线路的继电保护装置安装处M和继电保护装置安装处N的启动量是否满足启动条件，若是，则执行步骤(3)，若否，则结束操作；
步骤(3)、根据所述半波长输电线路的继电保护装置安装处M和继电保护装置安装处N的启动量满足启动条件的时间差确定故障点F；
步骤(4)、分别确定所述半波长输电线路的继电保护装置安装处M和继电保护装置安装处N补偿到故障点F处的补偿电流及补偿电压；
步骤(5)、确定所述半波长输电线路的伴随阻抗；
步骤(6)、由所述半波长输电线路的稳态量阻抗和变化量阻抗组成所 述半波长输电线路的伴随阻抗，根据所述半波长输电线路的伴随阻抗开放所述半波长输电线路的继电保护动作。如此，能够根据故障期间特性，利用时差法对故障进行定位，通过对线路两侧电压、电流进行补偿构造了伴随阻抗，能够正确地反映线路区内外故障，由于伴随阻抗保护有效地利用了双端量电气信息，因而在线路区内故障能够快速可靠地动作，线路区外故障不会误动，且保护具有较高的灵敏度。

Claims (7)

  1. 一种用于半波长输电线路的伴随阻抗保护方法，所述方法包括以下步骤：
    步骤(1)、分别获取半波长输电线路的继电保护装置安装处M和继电保护装置安装处N的三相电流及三相电压，其中，所述继电保护装置安装处M与所述继电保护装置安装处N互为对侧；
    步骤(2)、判断所述半波长输电线路的继电保护装置安装处M和继电保护装置安装处N的启动量是否满足启动条件，若是，则执行步骤(3)，若否，则结束操作；
    步骤(3)、根据所述半波长输电线路的继电保护装置安装处M和继电保护装置安装处N的启动量满足启动条件的时间差确定故障点F；
    步骤(4)、分别确定所述半波长输电线路的继电保护装置安装处M和继电保护装置安装处N补偿到故障点F处的补偿电流及补偿电压；
    步骤(5)、确定所述半波长输电线路的伴随阻抗；
    步骤(6)、由所述半波长输电线路的稳态量阻抗和变化量阻抗组成所述半波长输电线路的伴随阻抗，根据所述半波长输电线路的伴随阻抗开放所述半波长输电线路的继电保护动作。
  2. 如权利要求1所述的方法，其中，所述步骤(2)中，所述半波长输电线路的M侧继电保护装置安装处的启动条件公式为：
    ΔfM＝(ΔiMa-ΔiMb)2+(ΔiMb-ΔiMc)2+(ΔiMc-ΔiMa)2>fMset   (1)
    式(1)中，ΔfM为所述半波长输电线路的继电保护装置安装处M的启动量，ΔiMa为所述半波长输电线路的继电保护装置安装处M当前时刻A相电流与一个周波前A相电流的变化量，ΔiMb为所述半波长输电线路的继电保护装置安装处M当前时刻B相电流与一个周波前B相电流的变化量，ΔiMc 为所述半波长输电线路的继电保护装置安装处M安装处当前时刻C相电流与一个周波前C相电流的变化量，fMset为所述半波长输电线路的继电保护装置安装处M的启动量定值；
    所述半波长输电线路的N侧继电保护装置安装处的启动条件公式为：
    ΔfN＝(ΔiNa-ΔiNb)2+(ΔiNb-ΔiNc)2+(ΔiNc-ΔiNa)2>fNset   (2)
    式(2)中，ΔfN为所述半波长输电线路的继电保护装置安装处N的启动量，ΔiNa为所述半波长输电线路的继电保护装置安装处N当前时刻A相电流与一个周波前A相电流的变化量，ΔiNb为所述半波长输电线路的继电保护装置安装处N当前时刻B相电流与一个周波前B相电流的变化量，ΔiNc为所述半波长输电线路的继电保护装置安装处N继电保护装置安装处当前时刻C相电流与一个周波前C相电流的变化量，fNset为所述半波长输电线路的继电保护装置安装处N的启动量定值。
  3. 如权利要求1所述的方法，其中，所述步骤(3)中，设所述半波长输电线路的继电保护装置安装处M位于所述半波长输电线路的继电保护装置安装处M内侧，确定故障点F的公式为：
    Figure PCTCN2016087824-appb-100001
    式(3)中，x'为所述半波长输电线路的继电保护装置安装处M至所述故障点F的距离，L为所述半波长输电线路长度，c为光速，Δt为所述半波长输电线路的继电保护装置安装处M和继电保护装置安装处N的启动量满足启动条件的时间差，即Δt＝tM-tN，其中，tM为所述半波长输电线路的继电保护装置安装处M的启动量满足启动条件的时刻，tN为所述半波长输电线路的继电保护装置安装处N的启动量满足启动条件的时刻；
    若0<x'<L，则故障发生在所述半波长输电线路区内；
    若x'>L或x'<0，则故障发生在所述半波长输电线路区外。
  4. 如权利要求1所述的方法，其中，所述步骤(4)中，设所述半波长输电线路的继电保护装置安装处M位于所述半波长输电线路的继电保护装置安装处N内侧，则确定由所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的补偿电流及补偿电压的公式为：
    Figure PCTCN2016087824-appb-100002
    式(4)中，IMX-为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电流，IMX为所述半波长输电线路的继电保护装置安装处M的X相电流，UMX-为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电压，UMX为所述半波长输电线路的继电保护装置安装处M的X相电压，x'为所述半波长输电线路的继电保护装置安装处M至所述故障点F的距离，
    Figure PCTCN2016087824-appb-100003
    为所述半波长输电线路的传播常数，
    Figure PCTCN2016087824-appb-100004
    为所述半波长输电线路的波阻抗，Y0为所述半波长输电线路的单位长度导纳，Z0为所述半波长输电线路的单位长度阻抗，X∈{A,B,C}，其中，当x'>L时，x'取L，L为所述半波长输电线路长度，当x'<0时，x'取0；
    确定由所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的补偿电流及补偿电压的公式为：
    Figure PCTCN2016087824-appb-100005
    式(5)中，INX+为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电流，INX为所述半波长输电线路的继电保护装置安装处N的X相电流，UNX+为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电压，UNX为所述半波长输电线路的继电保 护装置安装处N的X相电压，x'为所述半波长输电线路的继电保护装置安装处M至所述故障点F的距离，当x'>L时，x'取L，L为所述半波长输电线路长度，当x'<0时，x'取0。
  5. 如权利要求1所述的方法，其中，所述步骤(5)中，确定所述半波长输电线路的伴随阻抗包括：
    确定所述半波长输电线路的稳态量阻抗的公式为：
    Figure PCTCN2016087824-appb-100006
    式(6)中，ZXΣ为所述半波长输电线路的X相稳态量阻抗，INX+为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电流，UNX+为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电压，IMX-为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电流，UMX-为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电压，X∈{A,B,C}；
    确定所述半波长输电线路的变化量阻抗的公式为：
    Figure PCTCN2016087824-appb-100007
    式(7)中，ΔZXΣ为所述半波长输电线路的X相变化量阻抗，ΔUNX+为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电压变化量，ΔUMX-为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电压变化量，ΔINX+为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电流变化量，ΔIMX-为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电流变化量。
  6. 如权利要求5所述的方法，其中，所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电压变化量ΔUNX+的计算公式 为：
    Figure PCTCN2016087824-appb-100008
    式(8)中，UNX+为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电压，
    Figure PCTCN2016087824-appb-100009
    为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处一个周波前的X相补偿电压，X∈{A,B,C}；
    所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电压变化量ΔUMX-的计算公式为：
    Figure PCTCN2016087824-appb-100010
    式(9)中，UMX-为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电压，
    Figure PCTCN2016087824-appb-100011
    为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处一个周波前的X相补偿电压；
    所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电流变化量ΔINX+的计算公式为：
    Figure PCTCN2016087824-appb-100012
    式(10)中，INX+为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处的X相补偿电流，
    Figure PCTCN2016087824-appb-100013
    为所述半波长输电线路的继电保护装置安装处N补偿到故障点F处一个周波前的X相补偿电流；
    所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电流变化量ΔIMX-的计算公式为：
    Figure PCTCN2016087824-appb-100014
    式(11)中，IMX-为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处的X相补偿电流，
    Figure PCTCN2016087824-appb-100015
    为所述半波长输电线路的继电保护装置安装处M补偿到故障点F处一个周波前的X相补偿电流。
  7. 如权利要求1所述的方法，其中，所述步骤(6)中，由所述半波 长输电线路的稳态量阻抗和变化量阻抗组成所述半波长输电线路的伴随阻抗，根据所述半波长输电线路的伴随阻抗开放所述半波长输电线路的继电保护动作，包括：
    当所述半波长输电线路的X相稳态量阻抗ZXΣ满足ZXΣ＜Zset，且所述半波长输电线路的X相变化量阻抗ΔZXΣ满足ΔZXΣ＜ΔZset时，所述半波长输电线路的X相启动继电保护动作，Zset为所述半波长输电线路的X相稳态量阻抗定值，ΔZset为所述半波长输电线路的X相变化量阻抗定值，X∈{A,B,C}。
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CN105576623B (zh) * 2016-01-29 2020-01-17 中国电力科学研究院 一种基于时差法的自适应半波长线路差动保护方法
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CN107894550A (zh) * 2017-10-17 2018-04-10 南京南瑞集团公司 一种适用于半波长输电线路稳定控制装置的故障跳闸判别方法
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CN111009886B (zh) * 2019-11-20 2022-04-01 金诗瑶 一种远程设置的电力保护方法及装置
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2221362A (en) * 1988-07-30 1990-01-31 Marconi Gec Ltd Attenuator
US6529010B1 (en) * 1997-12-22 2003-03-04 Abb Ab Location of fault on series-compensated power transmission lines
CN101227084A (zh) * 2008-01-08 2008-07-23 西安交通大学 一种电力系统高压输电线路纵联保护判定方法
CN101509949A (zh) * 2009-03-20 2009-08-19 华南理工大学 直流输电线路双端非同步且参数自适应的故障测距时域法
CN102099698A (zh) * 2008-07-18 2011-06-15 Abb技术有限公司 用于串联补偿输电线的故障定位的方法和设备
CN105552863A (zh) * 2016-01-28 2016-05-04 中国电力科学研究院 一种用于半波长输电线路的伴随阻抗保护方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5830554B2 (ja) * 1978-11-13 1983-06-29 東京電力株式会社 送電線故障点探査・送電線保護用の故障点標定方式

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2221362A (en) * 1988-07-30 1990-01-31 Marconi Gec Ltd Attenuator
US6529010B1 (en) * 1997-12-22 2003-03-04 Abb Ab Location of fault on series-compensated power transmission lines
CN101227084A (zh) * 2008-01-08 2008-07-23 西安交通大学 一种电力系统高压输电线路纵联保护判定方法
CN102099698A (zh) * 2008-07-18 2011-06-15 Abb技术有限公司 用于串联补偿输电线的故障定位的方法和设备
CN101509949A (zh) * 2009-03-20 2009-08-19 华南理工大学 直流输电线路双端非同步且参数自适应的故障测距时域法
CN105552863A (zh) * 2016-01-28 2016-05-04 中国电力科学研究院 一种用于半波长输电线路的伴随阻抗保护方法

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