WO2015139443A1 - 一种并联融冰模式下金属回线纵差保护方法 - Google Patents

一种并联融冰模式下金属回线纵差保护方法 Download PDF

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WO2015139443A1
WO2015139443A1 PCT/CN2014/087876 CN2014087876W WO2015139443A1 WO 2015139443 A1 WO2015139443 A1 WO 2015139443A1 CN 2014087876 W CN2014087876 W CN 2014087876W WO 2015139443 A1 WO2015139443 A1 WO 2015139443A1
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current
station
metal return
action
protection
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French (fr)
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吴庆范
黄金海
张爱玲
曹森
吴彦维
田培涛
范子强
许朋见
王柏恒
史林
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Xuji Group Co Ltd
XJ Electric Co Ltd
State Grid Corp of China SGCC
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Xuji Group Co Ltd
XJ Electric Co Ltd
State Grid Corp of China SGCC
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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
    • H02H7/268—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 for DC systems
    • 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

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  • the invention relates to a metal return line longitudinal difference protection method in a parallel melting mode, belonging to a UHV direct current transmission DC protection system.
  • the metal return line differential protection is an important protection function in the UHV DC transmission system, especially when the HVDC transmission system operates in the metal return line mode or in the parallel ice melting mode.
  • Parallel ice-melting mode is a special operation mode for protecting the line when the DC line is covered in winter.
  • the two-pole high-end valve group is operated in parallel to realize the large current flowing through the line, and the Joule heating effect of the current is used to make the connection online.
  • the ice on the road melted and fell off.
  • the metal return line differential protection mainly protects the high-resistance ground fault of the DC high-voltage line or the ground fault of the low-voltage return line.
  • the protection action signal is output after a certain delay, and an alarm event is issued, the phase shift is restarted once or Phase shifting blocking DC transmission system.
  • the existing metal return line differential protection method only calculates the difference between the metal return line current IDME of the station and the metal return line current IDME OS of the station, and the main wiring is as shown in FIG. 1 when the difference is greater than a certain limit.
  • the protection action signal is output after a long delay; however, in the parallel melting mode, due to the change of the main wiring mode, the IDME is only one pole current, not the total line current, when the pole 1 and the pole 2
  • the metal return longitudinal differential protection will be mis-operated, and the phase shifting DC system will not be able to perform the ice melting function.
  • the object of the invention is a metal return line longitudinal difference protection method in parallel ice melting mode, so as to solve the problem that the current metal return line longitudinal difference protection method causes the metal return line differential protection to malfunction in the parallel and ice melting mode. .
  • the present invention provides a metal return line differential protection in a parallel melting mode in order to solve the above technical problem.
  • the method includes the following steps:
  • the judgment in the step 3) is based on:
  • ⁇ is a constant fixed value
  • K is the ratio braking coefficient
  • is the absolute value of the total current of the station line.
  • the metal return line differential protection started in the step 3) is divided into three segments, each segment having different protection settings and corresponding delays and actions.
  • T1 is the delay time of the first action
  • T3 is the third action delay time.
  • step b When the criteria of steps b and c are met, the action in step b is performed first. If the fault is eliminated after the action 2, the action in step c is not performed. If the fault still exists and the criterion is still satisfied, then Perform the action in step c.
  • the first segment action delay time T1 is greater than the second segment action delay time T2 and the third segment action delay time T3, and the second segment action delay time T2 is smaller than the third segment action delay time T3.
  • the invention has the beneficial effects that the present invention provides a metal return line differential protection method for a parallel transmission mode DC transmission system, which firstly collects the pole 1 and pole 2 currents of the station and the opposite station, according to the collected The current calculates the total current of the station line and the total current of the station line respectively; then calculates the current difference between the station and the station according to the total line current of the station and the total current of the station line; finally, according to the total current difference of the lines of the two stations Differential protection.
  • the fault can be quickly and accurately judged. To avoid phase shifting of the system caused by misoperation of the metal return line differential protection in parallel ice melting mode.
  • Figure 1 is a schematic diagram of the main circuit and measuring point of the pole 1 metal return line
  • FIG. 2 is a schematic diagram of a main circuit and a measuring point of a parallel ice melting mode
  • FIG. 3 is a logic block diagram of a metal return line differential protection method of the present invention.
  • the main circuit and measuring point diagram of the parallel ice melting mode of the UHV DC transmission system are shown in Fig. 2.
  • the connection mode of the pole 1 high-end valve group and the pole 2 high-end valve group is used in parallel;
  • the measuring points used for the metal return line differential protection are the metal return current IDME, the pole 2 NBS switch current IDNEP2, the station metal return current IDME OS And the NBS switch current IDNE OS of the station pole 2.
  • the metal return line differential protection method in the parallel ice melting mode of the invention comprises the following steps:
  • ⁇ is a constant fixed value
  • K is the ratio braking coefficient
  • is the absolute value of the total current of the station line
  • Protection segmentation and protection action strategy The metal return line differential protection is divided into three segments, each segment has different protection settings and corresponding delay and action strategies.
  • the action 2 is performed first. If the fault is eliminated after the action 2, the action 3 is no longer performed. If the fault still exists and the criterion is still satisfied, the action 3 is performed, and the delay T2 of the action 2 is less than T3.
  • the value of T1 corresponds to a small value, so T1 is generally larger than T2 and T3.
  • T2 and T3 correspond to the same fixed value, but the delay is different from T2 ⁇ T3.
  • the invention can be implemented with an embedded industrial control platform or a PC device, which are commonly used devices in the field of high voltage direct current transmission.
  • the protection device first collects the metal return line differential protection used for the metal return current IDME, the pole 2 NBS switch current IDNEP2, the station metal return current IDME OS and the station pole 2 NBS switch current IDNE OS , and then Perform logical judgment and processing according to the logical block diagram of protection (as shown in Figure 23).

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

一种并联融冰模式下金属回线纵差保护方法，属于特高压直流输电直流保护领域。针对并联融冰模式下直流输电系统提出一种金属回线纵差保护方法，该方法首先采集本站和对站的极1和极2电流，根据所采集的电流分别计算本站线路总电流和对站线路总电流；然后根据本站线路总电流和对站线路总电流计算本站和对站的电流差值；最后根据两站的线路总电流差值进行纵差保护。克服了现有金属回线纵差保护中仅仅计算本站的金属回线电流和对站的金属回线电流的差值所造成的金属回线纵差保护误动，且该方法能够快速、准确地判断故障，避免并联融冰模式下金属回线纵差保护误动造成系统的移相闭锁。

Description

一种并联融冰模式下金属回线纵差保护方法 技术领域
本发明涉及一种并联融冰模式下金属回线纵差保护方法，属于特高压直流输电直流保护系统。
背景技术
金属回线纵差保护是特高压直流输电系统中重要的保护功能，特别是直流输电系统运行在金属回线方式时或并联融冰模式下。
并联融冰模式是冬季直流线路覆冰时为了保护线路的一种特殊运行方式，采用两个极的高端阀组并联运行的方式，以实现线路流过大电流，利用电流的焦耳热效应使附着在线路上的冰融化脱落。金属回线纵差保护主要保护直流高压线路的高阻接地故障或低压回线的接地故障。当其保护区内发生接地故障时，两侧的电流有很大的差值，当这个差值大于动作定值时，经过一定的延时输出保护动作信号，发出告警事件、移相重启一次或移相闭锁直流输电系统。
现有的金属回线纵差保护方法仅计算本站的金属回线电流IDME和对站的金属回线电流IDMEOS的差值，其主接线如图1所示，当差值大于一定的定值时，经过较长的延时后输出保护动作信号；但在并联融冰模式下，由于主接线方式的改变，IDME仅为一个极的电流，而不是线路总电流，当极1和极2电流出现差流时，将造成金属回线纵差保护误动，移相闭锁直流系统，无法进行融冰功能。
发明内容
本发明的目的是一种并联融冰模式下金属回线纵差保护方法，以解决目前的金属回线纵差保护方法在在、并联融冰模式下造成金属回线纵差保护误动的问题。
本发明为解决上述技术问题而提供一种并联融冰模式下金属回线纵差保护 方法，该保护方法包括以下步骤：
1)采集本站和对站的极1和极2电流，根据所采集的电流分别计算本站线路总电流和对站线路总电流；
2)根据本站线路总电流和对站线路总电流计算本站和对站的电流差值；
3)判断电流差值是否大于保护定值，如果大于，则启动金属回线纵差保护。
所述步骤3)中的判断依据为：
DIF＞Δ+K*|IDME+IDNEP2|
其中Δ为常数定值，K为比率制动系数，|IDME+IDNEP2|为本站线路总电流的绝对值。
所述步骤3)中启动的金属回线纵差保护分为三段，每段具有不同的保护定值及相应的延时和动作。
所述的三段保护分别为：
a.当DIF＞Δ1+K1*|IDME+IDNEP2|时，延时T1，发出告警，Δ1为第一段保护定值，K1为第一段比率制动系数，|IDME+IDNEP2|为本站线路总电流的绝对值，T1为第一段动作延时时间；
b.当DIF＞Δ2+K2*|IDME+IDNEP2|时，延时T2，移相重启一次，Δ2为第二段与第三段保护定值，K2为第二段与第三段比率制动系数，|IDME+IDNEP2|为本站线路总电流的绝对值，T2为第二段动作延时时间；
c.当DIF＞Δ2+K2*|IDME+IDNEP2|；延时T3，移相闭锁，T3为第三段动作延时时间。
所述当满足步骤b和c的判据时，先执行步骤b中的动作，如果动作二后故障消除，则不再执行步骤c中的动作，如故障依然存在，且判据依然满足，则执行步骤c中的动作。
所述第一段动作延时时间T1大于第二段动作延时时间T2和第三段动作延时时间T3，第二段动作延时时间T2小于第三段动作延时时间T3。
本发明的有益效果是：本发明针对并联融冰模式下直流输电系统提出一种金属回线纵差保护方法，该方法首先采集本站和对站的极1和极2电流，根据所采集的电流分别计算本站线路总电流和对站线路总电流；然后根据本站线路总电流和对站线路总电流计算本站和对站的电流差值；最后根据两站的线路总电流差值进行纵差保护。克服了现有金属回线总差保护中仅仅计算本站的金属回线电流和对站的金属回线电流的差值所造成的金属回线纵差保护误动，能够快速、准确地判断故障，避免并联融冰模式下金属回线纵差保护误动造成系统的移相闭锁。
附图说明
图1为极1金属回线主回路及测点示意图；
图2为并联融冰模式主回路及测点示意图；
图3为本发明金属回线纵差保护方法的逻辑框图。
具体实施方式
下面结合附图对本发明的具体实施方式作进一步的说明。
特高压直流输电系统的并联融冰模式的主回路及测点示意图，如图2所示。采用极1高端阀组和极2高端阀组并联的接线方式；金属回线纵差保护所用测点为金属回线电流IDME、极2的NBS开关电流IDNEP2、对站的金属回线电流IDMEOS和对站极2的NBS开关电流IDNEOS。本发明的并联融冰模式下金属回线纵差保护方法包括以下步骤：
1.采集本站的金属回线电流IDME和极2的NBS开关电流IDNEP2计算出线路总电流；采集对站的金属回线电流IDMEOS和极2的NBS开关电流IDNEP2OS计算出线路总电流。
2.计算两个高压直流环流站的电流差值DIF：
DIF＝||IDME+IDNEP2|-|IDMEOS+IDNEP2OS||
3.金属回线纵差保护的保护判据为：
DIF＞Δ+K*|IDME+IDNEP2|，
其中Δ为常数定值，K为比率制动系数，|IDME+IDNEP2|为本站线路总电流的绝对值；
4.保护分段与保护动作策略：金属回线纵差保护分为三段，每段具有不同的保护定值及相应的延时、动作策略。
1)DIF＞Δ1+K1*|IDME+IDNEP2|；延时T1；动作策略：发出告警事件；Δ1为第一段保护定值，K1为第一段比率制动系数，|IDME+IDNEP2|为本站线路总电流的绝对值，T1为第一段动作延时；
2)DIF＞Δ2+K2*|IDME+IDNEP2|；延时T2；动作策略：移相重启一次；Δ2为第二段与第三段保护定值，K2为第二段与第三段比率制动系数，|IDME+IDNEP2|为本站线路总电流的绝对值，T2为第二段动作延时；
3)DIF＞Δ2+K2*|IDME+IDNEP2|；延时T3；动作策略：移相闭锁；T3为第三段动作延时时间。
如满足第二段的判据，先执行动作二，如果动作二后故障消除，则不再执行动作三，如故障依然存在，判据依然满足，则执行动作三，动作二的延时T2小于T3。T1对应的一段定值小，故T1一般大于T2和T3，T2和T3对应相同的定值，但延时不同T2<T3。
本发明可以用嵌入式工业控制平台或PC装置来实现，此两种装置是高压直流输电领域常用的装置。保护装置首先采集金属回线纵差保护所用测点为金属回线电流IDME、极2的NBS开关电流IDNEP2、对站的金属回线电流IDMEOS和对站极2的NBS开关电流IDNEOS，然后按照保护的逻辑框图(如图23所示)进行逻辑判断和处理。

Claims (6)

  1. 一种并联融冰模式下金属回线纵差保护方法，其特征在于，该保护方法包括以下步骤：
    1)采集本站和对站的极1和极2电流，根据所采集的电流分别计算本站线路总电流和对站线路总电流；
    2)根据本站线路总电流和对站线路总电流计算本站和对站的电流差值；
    3)判断电流差值是否大于保护定值，如果大于，则启动金属回线纵差保护。
  2. 根据权利要求1所述的并联融冰模式下金属回线纵差保护方法，其特征在于，所述步骤3)中的判断依据为：
    DIF＞Δ+K*|IDME+IDNEP2|
    其中DIF为两个高压直流环流站的电流差值，Δ为常数定值，K为比率制动系数，|IDME+IDNEP2|为本站线路总电流的绝对值。
  3. 根据权利要求2所述的并联融冰模式下金属回线纵差保护方法，其特征在于，所述步骤3)中启动的金属回线纵差保护分为三段，每段具有不同的保护定值及相应的延时和动作。
  4. 根据权利要求3所述的并联融冰模式下金属回线纵差保护方法，其特征在于，所述的三段保护分别为：
    a.当DIF＞Δ1+K1*|IDME+IDNEP2|时，延时T1，发出告警，Δ1为第一段保护定值，K1为第一段比率制动系数，|IDME+IDNEP2|为本站线路总电流的绝对值，T1为第一段动作延时时间；
    b.当DIF＞Δ2+K2*|IDME+IDNEP2|时，延时T2，移相重启一次，Δ2为第二段与第三段保护定值，K2为第二段与第三段比率制动系数，|IDME+IDNEP2|为本站线路总电流的绝对值，T2为第二段动作延时时间；
    c.当DIF＞Δ2+K2*|IDME+IDNEP2|；延时T3，移相闭锁，T3为第三段动作延时时间。
  5. 根据权利要求4所述的并联融冰模式下金属回线纵差保护方法，其特征在于，所述当满足步骤b和c的判据时，先执行步骤b中的动作，如果动作二后故障消除，则不再执行步骤c中的动作，如故障依然存在，且判据依然满足，则执行步骤c中的动作。
  6. 根据权利要求4所述的并联融冰模式下金属回线纵差保护方法，其特征在于，所述第一段动作延时时间T1大于第二段动作延时时间T2和第三段动作延时时间T3，第二段动作延时时间T2小于第三段动作延时时间T3。
PCT/CN2014/087876 2014-03-19 2014-09-30 一种并联融冰模式下金属回线纵差保护方法 Ceased WO2015139443A1 (zh)

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