WO2020181718A1 - 直流输电线路保护的启动方法、装置及存储介质 - Google Patents

直流输电线路保护的启动方法、装置及存储介质 Download PDF

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WO2020181718A1
WO2020181718A1 PCT/CN2019/100356 CN2019100356W WO2020181718A1 WO 2020181718 A1 WO2020181718 A1 WO 2020181718A1 CN 2019100356 W CN2019100356 W CN 2019100356W WO 2020181718 A1 WO2020181718 A1 WO 2020181718A1
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current
time
line
sudden change
value
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English (en)
French (fr)
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曹虹
周泽昕
柳焕章
杜丁香
王兴国
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China Electric Power Research Institute Co Ltd CEPRI
State Grid Corp of China SGCC
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China Electric Power Research Institute Co Ltd CEPRI
State Grid Corp of China SGCC
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Priority to US17/438,524 priority Critical patent/US11742652B2/en
Publication of WO2020181718A1 publication Critical patent/WO2020181718A1/zh
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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
    • H02H3/44—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 the rate of change of electrical quantities
    • H02H3/445—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 the rate of change of electrical quantities of DC quantities

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  • the present disclosure relates to the technical field of transmission line protection, for example, to a method, device and storage medium for starting protection of a DC transmission line.
  • the HVDC transmission system Compared with the traditional AC transmission system, the HVDC transmission system has the advantages of large transmission capacity, long transmission distance, and low loss. It has been widely used in long-distance transmission, large-area grid interconnection, and underground cable transmission. HVDC transmission lines are responsible for the power transmission between energy sources and load centers. They have long transmission distances, poor operating conditions, and higher failure rates than other parts of the HVDC transmission system. Therefore, high-performance HVDC transmission line protection is of great significance to improving the safety and stability of the entire power grid.
  • the protective starting element of the DC transmission line is a voltage change starting element.
  • the voltage change activation element When the value obtained by subtracting the normal operating voltage from the voltage at the current moment is greater than a fixed value, the voltage change activation element is activated. If this setting value is relatively large, then when the DC line has a slight failure, the sensitivity of the voltage change activation element will be low; if this setting value is relatively small, as long as there is a disturbance, the voltage change activation component may be activated, so Not only is the reliability low, but it also causes the voltage change starting element to be frequently started during the normal operation of the power grid.
  • the technical solution of the present application provides a method, a device and a storage medium for starting protection of a direct current transmission line, so as to solve the problem of low sensitivity and reliability of the voltage change starting element.
  • this application provides a method for starting protection of a DC transmission line, including:
  • start Protection of DC transmission lines In response to determining that the sudden change of the DC line current at the current moment is greater than the sum of the memory activation threshold and the maximum value of the sudden change of the DC line current in the time period before the current time multiplied by the preset proportional coefficient, start Protection of DC transmission lines.
  • the sudden change amount of the DC line current at the current moment is greater than the sum of the memory activation threshold and the maximum value of the sudden change amount of the DC line current in the time period before the current moment multiplied by a preset proportional coefficient, including:
  • ⁇ i is the sudden change of the DC line current at the current moment
  • ⁇ i
  • i(t) is the DC line current value at the current moment
  • i(tt m ) is The current value of the DC line at the time m before the current time
  • i set 0 is the memory activation threshold
  • k is the preset scale factor
  • ⁇ i max is the maximum value of the sudden change of the DC line current in the time period before the current moment, the first time length is m 1 , the second time length is m 2 , and the ⁇ i max is from To The maximum value of the sudden change of the DC line current at each time in the time period, where the sudden change of the DC line current at each time is the DC line current value at the corresponding time and the DC line current at the previous m time The absolute value of the difference of the line current value, 0 ⁇ m 1 ⁇ m 2 ⁇ m.
  • the judging whether the sudden change of the DC line current at the current moment is greater than the sum of the memory startup threshold and the maximum value of the sudden change of the DC line current in a period of time before the current time multiplied by the preset proportional coefficient it further includes:
  • the current value of the DC link current i(t) at the current moment calculates the sudden change of the DC line current at the current time ⁇ i and the DC line current in the time period before the current time.
  • the method further includes:
  • start DC transmission line protection in response to determining that the sudden change of the DC line current at the current moment is greater than the memory activation threshold and the maximum value of the sudden change of the DC line current in the time period before the current moment multiplied by the preset proportional coefficient Sum, start DC transmission line protection, including:
  • the amount of sudden change in the DC link current at each moment is greater than the memory startup threshold and the DC link current in the time period before the corresponding moment multiplied by the preset proportional coefficient The sum of the maximum value of the sudden change amount, start the DC transmission line protection, where N 1 ⁇ N.
  • this application provides a starting device for protection of a DC transmission line, including:
  • the judging unit is configured to judge whether the sudden change amount of the DC line current at the current moment is greater than the sum of the memory start threshold and the maximum value of the sudden change amount of the DC line current in the time period before the current time multiplied by the preset proportional coefficient, wherein the time The period is the time period between the first time before the current time and the second time before the current time;
  • the execution unit is configured to start the protection of the DC transmission line according to the judgment result of the judgment unit.
  • the judgment unit is used to judge:
  • ⁇ i is the sudden change of the DC line current at the current moment
  • ⁇ i
  • i(t) is the DC line current value at the current moment
  • i(tt m ) is The current value of the DC line at the time m before the current time
  • i set 0 is the memory activation threshold
  • k is the preset scale factor
  • ⁇ i max is the maximum value of the sudden change of the DC line current in the time period before the current moment, the first time length is m 1 , the second time length is m 1 , and the ⁇ i max is from To The maximum value of the sudden change in the DC line current at each time within the time period, where the sudden change in the DC line current at each time is the DC line current value at the corresponding time and the DC line current at the previous m time The absolute value of the difference of the line current value, 0 ⁇ m 1 ⁇ m 2 ⁇ m.
  • the device further includes:
  • the acquisition unit is configured to collect the current value of the DC line i(t) at the current time, the current value of the DC line i(tt m ) at the time m before the current time, and the DC line at each time in the time period before the current time The current value, and the current value of the DC link at the time m before each time in the time period before the current time;
  • the calculation unit is set to collect the DC line current value i(t) at the current time, the DC line current value i(tt m ) at the time m time before the current time, and each of the time periods before the current time.
  • the current value of the DC line at the time, and the current value of the DC line at the time m before each time in the time period before the current time calculate the sudden change of the DC line current at the current time ⁇ i and the time period before the current time
  • the maximum value of the abrupt change of the internal DC line current ⁇ i max is set to collect the DC line current value i(t) at the current time, the DC line current value i(tt m ) at the time m time before the current time, and each of the time periods before the current time.
  • the judging unit is further configured to judge whether there are N 1 consecutive moments after the current moment, and the sudden change in the DC line current at each moment is greater than the memory startup threshold and multiplied by the preset ratio The sum of the maximum value of the sudden change of the DC line current in the time period before the corresponding time of the coefficient;
  • the execution unit is further configured to respond to determining that the sudden change of the DC line current at each of the N 1 moments in the N moments is greater than the memory startup threshold and the corresponding moment before the multiplied by the preset proportional coefficient The sum of the maximum value of the sudden change of the DC line current in the time period of, the DC transmission line protection is started, where N 1 ⁇ N.
  • the present application provides a device for starting protection of a DC transmission line, including a memory, a processor, and a computer program stored on the memory and running on the processor.
  • the computer program is When the processor is executed, the method for starting the protection of the direct current transmission line in the first aspect is realized.
  • the present application provides a storage medium that stores an information processing program that, when executed by a processor, implements the method for starting protection of the DC transmission line in the first aspect.
  • Fig. 1 is a flowchart of a method for starting protection of a DC transmission line according to an embodiment of the present application
  • Fig. 2 is a structural diagram of a starting device for protection of a DC transmission line according to an embodiment of the present application.
  • FIG. 1 is a flowchart of a method for starting protection of a DC transmission line according to an embodiment of the present application.
  • This embodiment provides a method for starting protection of a DC transmission line, which is based on a sudden change in current as a criterion for starting the protection of a DC transmission line.
  • a method for starting protection of a DC transmission line includes the following steps.
  • Step 101 Determine whether the DC transmission line protection is activated based on the current sudden change, including: judging whether the current sudden change of the DC line current is greater than the memory start threshold and the DC line in the time period before the current time multiplied by the preset proportional coefficient The sum of the maximum value of the sudden change amount of the current, wherein the time period is the time period between the time at the first time before the current time and the time at the second time before the current time.
  • the maximum value of the sudden change in the DC line current in the time period before the current time multiplied by the preset proportional coefficient that is, the maximum value of the sudden change in the DC line current in the time period before the current time is multiplied by the preset ratio The value of the coefficient.
  • the sudden change of the DC line current at the current moment is greater than the sum of the memory activation threshold and the maximum value of the sudden change of the DC line current in the time period before the current time multiplied by the preset proportional coefficient, including:
  • ⁇ i is the sudden change of the DC line current at the current moment
  • ⁇ i
  • i(t) is the DC line current value at the current moment
  • i(tt m ) is The current value of the DC line current m before the current time
  • i set 0 is the memory start threshold
  • k is the preset proportional coefficient, used to adjust the maximum value of the sudden change of the DC line current in the time period before the current time
  • ⁇ i max is the maximum value of the sudden change of the DC line current in the time period before the current moment
  • the first time length is m 1
  • the second time length is m 2
  • the ⁇ i max is from To The maximum value of the sudden change in the DC line current at each time within the time period, where the sudden change in the DC line current at each time is the DC line current value at the corresponding time and the DC line current at the previous m time
  • Step 102 In response to determining that the sudden change of the DC line current at the current moment is greater than the sum of the memory start threshold and the maximum value of the sudden change of the DC line current in the time period before the current time multiplied by the preset proportional coefficient, start the DC transmission line protection.
  • the embodiment of the present application provides a criterion for whether the protection of the DC transmission line is activated based on the sudden change of current, and improves the sensitivity and reliability of the protection activation element of the DC transmission line.
  • the startup method of DC transmission line protection proposed in this application includes the following steps.
  • Fig. 2 is a structural diagram of a starting device for protection of a DC transmission line according to an embodiment of the present application.
  • a device for starting protection of a DC transmission line includes a first determining unit 201 and an executing unit 202.
  • the judging unit 201 is configured to judge whether the sudden change of the DC line current at the current moment is greater than the sum of the memory startup threshold and the maximum value of the sudden change of the DC line current in the time period before the current time multiplied by a preset proportional coefficient, wherein the The time period is the time period between the first time before the current time and the second time before the current time;
  • the judging unit 201 is used to judge:
  • ⁇ i is the sudden change of the DC line current at the current moment
  • ⁇ i
  • i(t) is the DC line current value at the current moment
  • i(tt m ) is The current value of the DC line current m before the current time
  • i set 0 is the memory start threshold
  • k is the preset proportional coefficient, used to adjust the maximum value of the sudden change of the DC line current in the time period before the current time
  • ⁇ i max is the maximum value of the sudden change of the DC line current in the time period before the current moment
  • the first time length is m 1
  • the second time length is m 2
  • the ⁇ i max is from To The maximum value of the sudden change in the DC line current at each time within the time period, where the sudden change in the DC line current at each time is the DC line current value at the corresponding time and the DC line current at the previous m time
  • the execution unit 202 is configured to start the DC transmission line protection according to the judgment result of the judgment unit.
  • the device for starting protection of the DC transmission line further includes a collection unit and a calculation unit.
  • the collecting unit is set to collect the current value of the DC line i(t) at the current time, the current value of the DC line i(tt m ) at the time m before the current time, and each time in the time period before the current time The current value of the DC line, and the current value of the DC line at the time m before each time in the time period before the current time;
  • the calculation unit is set to collect the DC line current value i(t) at the current time, the DC line current value i(tt m ) at the time m time before the current time, and each of the time periods before the current time.
  • the current value of the DC line at the time, and the current value of the DC line at the time m before each time in the time period before the current time calculate the sudden change of the DC line current at the current time ⁇ i and the time period before the current time
  • the maximum value of the abrupt change of the internal DC line current ⁇ i max is set to collect the DC line current value i(t) at the current time, the DC line current value i(tt m ) at the time m time before the current time, and each of the time periods before the current time.
  • the judging unit is further configured to judge whether there are N 1 consecutive moments after the current moment, and the sudden change of the DC line current at each moment is greater than the memory startup threshold and multiplied by The sum of the maximum value of the sudden change amount of the DC line current in the time period before the corresponding time of the preset proportional coefficient;
  • the execution unit is further configured to respond to determining that the sudden change of the DC line current at each of the N 1 moments in the N moments is greater than the memory startup threshold and the corresponding moment before the multiplied by the preset proportional coefficient The sum of the maximum value of the sudden change of the DC line current in the time period of, the DC transmission line protection is started, where N 1 ⁇ N.
  • the DC transmission line protection starting device 200 in the embodiment of the present application corresponds to the DC transmission line protection starting method 100 according to the embodiment of the present application, and will not be repeated here.
  • An embodiment of the present application also provides a device for starting protection of a direct current transmission line, including a memory, a processor, and a computer program stored on the memory and running on the processor, and the computer program is processed by the processor.
  • the start method of the above DC transmission line protection is realized when the device is executed.
  • the embodiment of the present application also provides a storage medium, the storage medium stores an information processing program, and when the information processing program is executed by a processor, the method for starting the protection of the DC transmission line is realized.
  • Such software may be distributed on a computer-readable medium, and the computer-readable medium may include a storage medium (or a non-transitory medium) and a communication medium (or a transitory medium).
  • the term storage medium includes volatile and non-volatile properties implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). , Removable and non-removable media.
  • Storage media include, but are not limited to, Random Access Memory (RAM), Read-Only Memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), and flash memory Or other memory technologies, Compact Disc Read-Only Memory (CD-ROM), Digital Video Disc (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices Or any other medium that can be used to store desired information and that can be accessed by a computer.
  • communication media usually contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as carrier waves or other transmission mechanisms, and may include any information delivery media .

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Abstract

本文公开了一种直流输电线路保护的启动方法、装置及存储介质。直流输电线路保护的启动方法包括：判断当前时刻直流线路电流的突变量是否大于记忆启动阈值与乘以预设比例系数的当前时刻之前的时间段内直流线路电流的突变量最大值之和，其中，所述时间段为当前时刻往前第一时长所在时刻和当前时刻往前第二时长所在时刻之间的时间段；响应于确定所述当前时刻直流线路电流的突变量大于所述记忆启动阈值与乘以所述预设比例系数的所述当前时刻之前的时间段内直流线路电流的突变量最大值之和，启动直流输电线路保护。

Description

直流输电线路保护的启动方法、装置及存储介质
本申请要求在2019年03月14日提交中国专利局、申请号为201910193788.5的中国专利申请的优先权，该申请的全部内容通过引用结合在本申请中。
技术领域
本公开涉及输电线路保护技术领域，例如涉及一种直流输电线路保护的启动方法、装置及存储介质。
背景技术
与传统交流输电系统相比，高压直流输电系统具有输送容量大、传输距离远、损耗低等优点，并在远距离输电、大区域的电网互联、地下电缆输电等方面得到了广泛应用。高压直流输电线路担负能源产地和负荷中心之间电能传输的重任，其输电距离远，运行条件恶劣，并且故障率高于高压直流输电系统的其他部分。因此，高性能的高压直流输电线路保护对提高整个电网的安全稳定性具有重要意义。
目前，直流输电线路保护启动元件为电压变化量启动元件。当当前时刻的电压减去正常运行电压得到的数值大于一个定值时，电压变化量启动元件被启动。如果这个定值比较大，那么当直流线路发生轻微故障时，电压变化量启动元件的灵敏度较低；如果这个定值比较小，那么只要出现扰动，电压变化量启动元件可能就会被启动，这样不仅可靠性较低，而且还会导致在电网正常运行过程中电压变化量启动元件被频繁启动。
发明内容
本申请技术方案提供一种直流输电线路保护的启动方法、装置及存储介质，以解决电压变化量启动元件的灵敏度和可靠度较低的问题。
第一方面，本申请提供了一种直流输电线路保护的启动方法，包括：
判断当前时刻直流线路电流的突变量是否大于记忆启动阈值与乘以预设比例系数的当前时刻之前的时间段内直流线路电流的突变量最大值之和，其中， 所述时间段为当前时刻往前第一时长所在时刻和当前时刻往前第二时长所在时刻之间的时间段；
响应于确定所述当前时刻直流线路电流的突变量大于所述记忆启动阈值与乘以所述预设比例系数的所述当前时刻之前的时间段内直流线路电流的突变量最大值之和，启动直流输电线路保护。
其中，所述当前时刻直流线路电流的突变量大于所述记忆启动阈值与乘以预设比例系数的所述当前时刻之前的时间段内直流线路的电流的突变量最大值之和，包括：
Δi>i set 0+kΔi max
其中，Δi为所述当前时刻直流线路电流的突变量，Δi＝|i(t)-i(t-t m)|，i(t)为所述当前时刻直流线路电流值，i(t-t m)为当前时刻往前m时长所在时刻直流线路电流值；
i set 0为所述记忆启动阈值；
k为所述预设比例系数；
Δi max为所述当前时刻之前的时间段内直流线路电流的突变量最大值，所述第一时长为m 1，所述第二时长为m 2，所述Δi max为从
Figure PCTCN2019100356-appb-000001
到
Figure PCTCN2019100356-appb-000002
的时间段内的每一个时刻的直流线路电流的突变量中的最大值，其中，所述每一个时刻的直流线路电流的突变量为对应时刻的直流线路电流值与往前m时长所在时刻直流线路电流值的差值绝对值，0<m 1<m 2≤m。
其中，所述判断当前时刻直流线路电流的突变量是否大于记忆启动阈值与乘以预设比例系数的当前时刻之前的一时间段内直流线路电流的突变量最大值之和之前，还包括：
采集当前时刻直流线路电流值i(t)、所述当前时刻往前m时长所在时刻直流线路电流值i(t-t m)，当前时刻之前的时间段内的每一个时刻直流线路电流值，以及当前时刻之前的时间段内的每一个时刻往前m时长所在时刻直流线路电流值；
根据采集到的当前时刻直流线路电流值i(t)、所述当前时刻往前m时长所在 时刻直流线路电流值i(t-t m)，当前时刻之前的时间段内的每一个时刻直流线路电流值，以及当前时刻之前的时间段内的每一个时刻往前m时长所在时刻直流线路电流值，计算所述当前时刻直流线路电流的突变量Δi和所述当前时刻之前的时间段内直流线路电流的突变量最大值Δi max。
其中，所述判断当前时刻直流线路电流的突变量是否大于记忆启动阈值与乘以所述预设比例系数的当前时刻之前的时间段内直流线路电流的突变量最大值之和之后，还包括：
判断所述当前时刻之后连续N个时刻中是否存在N 1个时刻中的每一个时刻直流线路电流的突变量均大于记忆启动阈值与乘以所述预设比例系数的对应时刻之前的时间段内直流线路电流的突变量最大值之和；
其中，所述响应于确定所述当前时刻直流线路电流的突变量大于所述记忆启动阈值与乘以所述预设比例系数的所述当前时刻之前的时间段内直流线路电流的突变量最大值之和，启动直流输电线路保护，包括：
响应于确定所述N个时刻中存在N 1个时刻中的每一个时刻直流线路电流的突变量均大于记忆启动阈值与乘以所述预设比例系数的对应时刻之前的时间段内直流线路电流的突变量最大值之和，启动直流输电线路保护，其中，N 1≤N。
第二方面，本申请提供了一种直流输电线路保护的启动装置，包括：
判断单元，设置为判断当前时刻直流线路电流的突变量是否大于记忆启动阈值与乘以预设比例系数的当前时刻之前的时间段内直流线路电流的突变量最大值之和，其中，所述时间段为当前时刻往前第一时长所在时刻和当前时刻往前第二时长所在时刻之间的时间段；
执行单元，设置为根据所述判断单元的判断结果，启动直流输电线路保护。
其中，所述判断单元是用于判断：
Δi>i set 0+kΔi max
其中，Δi为所述当前时刻直流线路电流的突变量，Δi＝|i(t)-i(t-t m)|，i(t)为所述当前时刻直流线路电流值，i(t-t m)为当前时刻往前m时长所在时刻直流线路电流值；
i set 0为所述记忆启动阈值；
k为所述预设比例系数；
Δi max为所述当前时刻之前的时间段内直流线路电流的突变量最大值，所述第一时长为m 1，所述第二时长为m 1，所述Δi max为从
Figure PCTCN2019100356-appb-000003
到
Figure PCTCN2019100356-appb-000004
的时间段内的每一个时刻的直流线路电流的突变量中的最大值，其中，所述每一个时刻的直流线路电流的突变量为对应时刻的直流线路电流值与往前m时长所在时刻直流线路电流值的差值绝对值，0<m 1<m 2≤m。
其中，所述装置还包括：
采集单元，设置为采集当前时刻直流线路电流值i(t)、所述当前时刻往前m时长所在时刻直流线路电流值i(t-t m)，当前时刻之前的时间段内的每一个时刻直流线路电流值，以及当前时刻之前的时间段内的每一个时刻往前m时长所在时刻直流线路电流值；
计算单元，设置为根据采集到的当前时刻直流线路电流值i(t)、所述当前时刻往前m时长所在时刻直流线路电流值i(t-t m)，当前时刻之前的时间段内的每一个时刻直流线路电流值，以及当前时刻之前的时间段内的每一个时刻往前m时长所在时刻直流线路电流值，计算所述当前时刻直流线路电流的突变量Δi和所述当前时刻之前的时间段内直流线路电流的突变量最大值Δi max。
其中，所述判断单元还设置为判断所述当前时刻之后连续N个时刻中是否存在N 1个时刻中的每一个时刻直流线路电流的突变量均大于记忆启动阈值与乘以所述预设比例系数的对应时刻之前的时间段内直流线路电流的突变量最大值之和；
所述执行单元还设置为响应于确定所述N个时刻中存在N 1个时刻中的每一个时刻直流线路电流的突变量均大于记忆启动阈值与乘以所述预设比例系数的对应时刻之前的时间段内直流线路电流的突变量最大值之和，启动直流输电线路保护，其中，N 1≤N。
第三方面，本申请提供了一种直流输电线路保护的启动装置，包括存储器、处理器及存储在所述存储器上并可在所述处理器上运行的计算机程序，所述计算机程序被所述处理器执行时实现上述第一方面中的直流输电线路保护的启动 方法。
第四方面，本申请提供了一种存储介质，存储有信息处理程序，所述信息处理程序被处理器执行时实现上述第一方面中的直流输电线路保护的启动方法。
附图说明
图1为根据本申请一实施例的直流输电线路保护的启动方法流程图；
图2为根据本申请一实施例的直流输电线路保护的启动装置结构图。
具体实施方式
现在参考附图介绍本申请的示例性实施例，图1为根据本申请一实施例的直流输电线路保护的启动方法流程图。本实施例提供一种直流输电线路保护的启动方法，该方法基于电流突变量作为直流输电线路保护的启动的判据。如图1所示，一种直流输电线路保护的启动方法，包括如下步骤。
步骤101：基于电流突变量进行直流输电线路保护是否启动的判断，包括：判断当前时刻直流线路电流的突变量是否大于记忆启动阈值与乘以预设比例系数的当前时刻之前的时间段内直流线路电流的突变量最大值之和，其中，所述时间段为当前时刻往前第一时长所在时刻和当前时刻往前第二时长所在时刻之间的时间段。其中，乘以预设比例系数的当前时刻之前的时间段内直流线路电流的突变量最大值，也即是，将当前时刻之前的时间段内直流线路电流的突变量最大值乘以预设比例系数得到的数值。
在一实施例中，当前时刻直流线路电流的突变量大于记忆启动阈值与乘以预设比例系数的当前时刻之前的时间段内直流线路电流的突变量最大值之和，包括：
Δi>i set 0+kΔi max
其中，Δi为所述当前时刻直流线路电流的突变量，Δi＝|i(t)-i(t-t m)|，i(t)为所述当前时刻直流线路电流值，i(t-t m)为当前时刻往前m时长所在时刻直流线路电流值；i set 0为所述记忆启动阈值；k为所述预设比例系数，用于调整当前时刻之 前的时间段内直流线路电流的突变量最大值；Δi max为所述当前时刻之前的时间段内直流线路电流的突变量最大值，所述第一时长为m 1，所述第二时长为m 2，所述Δi max为从
Figure PCTCN2019100356-appb-000005
到
Figure PCTCN2019100356-appb-000006
的时间段内的每一个时刻的直流线路电流的突变量中的最大值，其中，所述每一个时刻的直流线路电流的突变量为对应时刻的直流线路电流值与往前m时长所在时刻直流线路电流值的差值绝对值，0<m 1<m 2≤m。
步骤102：响应于确定当前时刻直流线路电流的突变量大于记忆启动阈值与乘以所述预设比例系数的当前时刻之前的时间段内直流线路电流的突变量最大值之和，启动直流输电线路保护。
本申请实施例基于电流突变量为直流输电线路保护是否启动提供了判据，提高了直流输电线路保护启动元件的灵敏度和可靠性。
本申请提出的一种直流输电线路保护的启动方法，包括如下步骤。
(1)采集当前时刻直流线路电流值i(t)，并根据当前时刻往前m时长所在时刻直流线路电流值i(t-t m)计算电流突变量，Δi＝|i(t)-i(t-t m)|。计算当前时刻之前的时间段内的直流线路电流的突变量中的最大值Δi max。判断是否满足Δi>i set 0+kΔi max。
(2)连续采集N个时刻的直流线路电流值并计算N个时刻中的每个时刻对应的电流突变量，判断N个时刻中的每个时刻是否都满足Δi>i set 0+kΔi max。若N个时刻里，有N 1个时刻满足Δi>i set 0+kΔi max，则启动直流输电线路保护；若N个时刻里，小于N 1个时刻满足Δi>i set 0+kΔi max，则不启动直流输电线路保护。
图2为根据本申请一实施例的直流输电线路保护的启动装置的结构图。如图2所示，一种直流输电线路保护的启动装置，包括第一判断单元201和执行单元202。
判断单元201，设置为判断当前时刻直流线路电流的突变量是否大于记忆启动阈值与乘以预设比例系数的当前时刻之前的时间段内直流线路电流的突变量最大值之和，其中，所述时间段为当前时刻往前第一时长所在时刻和当前时刻往前第二时长所在时刻之间的时间段；
在一实施例中，判断单元201是用于判断：
Δi>i set 0+kΔi max
其中，Δi为所述当前时刻直流线路电流的突变量，Δi＝|i(t)-i(t-t m)|，i(t)为所述当前时刻直流线路电流值，i(t-t m)为当前时刻往前m时长所在时刻直流线路电流值；i set 0为所述记忆启动阈值；k为所述预设比例系数，用于调整当前时刻之前的时间段内直流线路电流的突变量最大值；Δi max为所述当前时刻之前的时间段内直流线路电流的突变量最大值，所述第一时长为m 1，所述第二时长为m 2，所述Δi max为从
Figure PCTCN2019100356-appb-000007
到
Figure PCTCN2019100356-appb-000008
的时间段内的每一个时刻的直流线路电流的突变量中的最大值，其中，所述每一个时刻的直流线路电流的突变量为对应时刻的直流线路电流值与往前m时长所在时刻直流线路电流值的差值绝对值，0<m 1<m 2≤m。
执行单元202，设置为根据判断单元的判断结果，启动直流输电线路保护。
在一实施例中，直流输电线路保护的启动装置还包括采集单元和计算单元。
其中，采集单元，设置为采集当前时刻直流线路电流值i(t)、所述当前时刻往前m时长所在时刻直流线路电流值i(t-t m)，当前时刻之前的时间段内的每一个时刻直流线路电流值，以及当前时刻之前的时间段内的每一个时刻往前m时长所在时刻直流线路电流值；
计算单元，设置为根据采集到的当前时刻直流线路电流值i(t)、所述当前时刻往前m时长所在时刻直流线路电流值i(t-t m)，当前时刻之前的时间段内的每一个时刻直流线路电流值，以及当前时刻之前的时间段内的每一个时刻往前m时长所在时刻直流线路电流值，计算所述当前时刻直流线路电流的突变量Δi和所述当前时刻之前的时间段内直流线路电流的突变量最大值Δi max。
在一实施例中，其中，所述判断单元还设置为判断所述当前时刻之后连续N个时刻中是否存在N 1个时刻中的每一个时刻直流线路电流的突变量均大于记忆启动阈值与乘以所述预设比例系数的对应时刻之前的时间段内直流线路电流的突变量最大值之和；
所述执行单元还设置为响应于确定所述N个时刻中存在N 1个时刻中的每一个时刻直流线路电流的突变量均大于记忆启动阈值与乘以所述预设比例系数的 对应时刻之前的时间段内直流线路电流的突变量最大值之和，启动直流输电线路保护，其中，N 1≤N。
本申请实施例中的直流输电线路保护的启动装置200与本申请实施方式的直流输电线路保护的启动方法100相对应，在此不再进行赘述。
本申请实施例还提供了一种直流输电线路保护的启动装置，包括存储器、处理器及存储在所述存储器上并可在所述处理器上运行的计算机程序，所述计算机程序被所述处理器执行时实现上述直流输电线路保护的启动方法。
本申请实施例还提供了一种存储介质，所述存储介质上存储有信息处理程序，所述信息处理程序被处理器执行时实现上述直流输电线路保护的启动方法。
本领域普通技术人员可以理解，上文中所公开方法中的全部或某些步骤、系统、装置中的功能模块/单元可以被实施为软件、固件、硬件及其适当的组合。在硬件实施方式中，在以上描述中提及的功能模块/单元之间的划分不一定对应于物理组件的划分；例如，一个物理组件可以具有多个功能，或者一个功能或步骤可以由若干物理组件合作执行。某些组件或所有组件可以被实施为由处理器，如数字信号处理器或微处理器执行的软件，或者被实施为硬件，或者被实施为集成电路，如专用集成电路。这样的软件可以分布在计算机可读介质上，计算机可读介质可以包括存储介质(或非暂时性介质)和通信介质(或暂时性介质)。如本领域普通技术人员公知的，术语存储介质包括在用于存储信息(诸如计算机可读指令、数据结构、程序模块或其他数据)的任何方法或技术中实施的易失性和非易失性、可移除和不可移除介质。存储介质包括但不限于随机存取存储器(Random Access Memory，RAM)、只读存储器(Read-Only Memory，ROM)、带电可擦可编程只读存储器(Electrically Erasable Programmable read only memory，EEPROM)、闪存或其他存储器技术、光盘只读存储器(Compact Disc Read-Only Memory，CD-ROM)、数字多功能盘(Digital Video Disc，DVD)或其他光盘存储、磁盒、磁带、磁盘存储或其他磁存储装置、或者可以用于存储期望的信息并且可以被计算机访问的任何其他的介质。此外，本领域普通技术人员公知的是，通信介质通常包含计算机可读指令、数据结构、程序模块或者诸如载波或其他传输机制之类的调制数据信号中的其他数据，并且可包括任何 信息递送介质。

Claims (10)

  1. 一种直流输电线路保护的启动方法，包括：
    判断当前时刻直流线路电流的突变量是否大于记忆启动阈值与乘以预设比例系数的当前时刻之前的时间段内直流线路电流的突变量最大值之和，其中，所述时间段为当前时刻往前第一时长所在时刻和当前时刻往前第二时长所在时刻之间的时间段；
    响应于确定所述当前时刻直流线路电流的突变量大于所述记忆启动阈值与乘以所述预设比例系数的所述当前时刻之前的时间段内直流线路电流的突变量最大值之和，启动直流输电线路保护。
  2. 根据权利要求1所述的方法，其中，所述当前时刻直流线路电流的突变量大于所述记忆启动阈值与乘以预设比例系数的所述当前时刻之前的时间段内直流线路电流的突变量最大值之和，包括：
    Δi>i set 0+kΔi max
    其中，Δi为所述当前时刻直流线路电流的突变量，Δi＝|i(t)-i(t-t m)|，i(t)为所述当前时刻直流线路电流值，i(t-t m)为当前时刻往前m时长所在时刻直流线路电流值；
    i set 0为所述记忆启动阈值；
    k为所述预设比例系数；
    Δi max为所述当前时刻之前的时间段内直流线路电流的突变量最大值，所述第一时长为m 1，所述第二时长为m 2，所述Δi max为从
    Figure PCTCN2019100356-appb-100001
    到
    Figure PCTCN2019100356-appb-100002
    的时间段内的每一个时刻的直流线路电流的突变量中的最大值，其中，所述每一个时刻的直流线路电流的突变量为对应时刻的直流线路电流值与往前m时长所在时刻的直流线路电流值的差值绝对值，0<m 1<m 2≤m。
  3. 根据权利要求2所述的方法，其中，所述判断当前时刻直流线路电流的突变量是否大于记忆启动阈值与乘以预设比例系数的当前时刻之前的时间段内直流线路电流的突变量最大值之和之前，还包括：
    采集当前时刻直流线路电流值i(t)、所述当前时刻往前m时长所在时刻直流线路电流值i(t-t m)，当前时刻之前的时间段内的每一个时刻直流线路电流值，以 及当前时刻之前的时间段内的每一个时刻往前m时长所在时刻直流线路电流值；
    根据采集到的当前时刻直流线路电流值i(t)、所述当前时刻往前m时长所在时刻直流线路电流值i(t-t m)，当前时刻之前的时间段内的每一个时刻直流线路电流值，以及当前时刻之前的时间段内的每一个时刻往前m时长所在时刻直流线路电流值，计算所述当前时刻直流线路电流的突变量Δi和所述当前时刻之前的时间段内直流线路电流的突变量最大值Δi max。
  4. 根据权利要求1所述的方法，其中，所述判断当前时刻直流线路电流的突变量是否大于记忆启动阈值与乘以预设比例系数的当前时刻之前的时间段内直流线路电流的突变量最大值之和之后，还包括：
    判断所述当前时刻之后连续N个时刻中是否存在N 1个时刻中的每一个时刻直流线路电流的突变量均大于记忆启动阈值与乘以所述预设比例系数的对应时刻之前的时间段内直流线路电流的突变量最大值之和；
    其中，所述响应于确定所述当前时刻直流线路电流的突变量大于所述记忆启动阈值与乘以所述预设比例系数的所述当前时刻之前的时间段内直流线路电流的突变量最大值之和，启动直流输电线路保护，包括：
    响应于确定所述N个时刻中存在N 1个时刻中的每一个时刻直流线路电流的突变量均大于记忆启动阈值与乘以所述预设比例系数的对应时刻之前的时间段内直流线路电流的突变量最大值之和，启动直流输电线路保护，其中，N 1≤N。
  5. 一种直流输电线路保护的启动装置，包括：
    判断单元，设置为判断当前时刻直流线路电流的突变量是否大于记忆启动阈值与乘以预设比例系数的当前时刻之前的时间段内直流线路电流的突变量最大值之和，其中，所述时间段为当前时刻往前第一时长所在时刻和当前时刻往前第二时长所在时刻之间的时间段；
    执行单元，设置为根据所述判断单元的判断结果，启动直流输电线路保护。
  6. 根据权利要求5所述的装置，其中，所述判断单元是用于判断：
    Δi>i set 0+kΔi max
    其中，Δi为所述当前时刻直流线路电流的突变量，Δi＝|i(t)-i(t-t m)|，i(t)为所 述当前时刻直流线路电流值，i(t-t m)为当前时刻往前m时长所在时刻直流线路电流值；
    i set 0为所述记忆启动阈值；
    k为所述预设比例系数；
    Δi max为所述当前时刻之前的时间段内直流线路电流的突变量最大值，所述第一时长为m 1，所述第二时长为m 1，所述Δi max为从
    Figure PCTCN2019100356-appb-100003
    到
    Figure PCTCN2019100356-appb-100004
    的时间段内的每一个时刻的直流线路电流的突变量中的最大值，其中，所述每一个时刻的直流线路电流的突变量为对应时刻的直流线路电流值与往前m时长所在时刻的直流线路电流值的差值绝对值，0<m 1<m 2≤m。
  7. 根据权利要求6所述的装置，还包括：
    采集单元，设置为采集当前时刻直流线路电流值i(t)、所述当前时刻往前m时长所在时刻直流线路电流值i(t-t m)，当前时刻之前的时间段内的每一个时刻直流线路电流值，以及当前时刻之前的时间段内的每一个时刻往前m时长所在时刻直流线路电流值；
    计算单元，设置为根据采集到的当前时刻直流线路电流值i(t)、所述当前时刻往前m时长所在时刻直流线路电流值i(t-t m)，当前时刻之前的时间段内的每一个时刻直流线路电流值，以及当前时刻之前的时间段内的每一个时刻往前m时长所在时刻直流线路电流值，计算所述当前时刻直流线路电流的突变量Δi和所述当前时刻之前的时间段内直流线路电流的突变量最大值Δi max。
  8. 根据权利要求5所述的装置，其中，所述判断单元还设置为判断所述当前时刻之后连续N个时刻中是否存在N 1个时刻中的每一个时刻直流线路电流的突变量均大于记忆启动阈值与乘以所述预设比例系数的对应时刻之前的时间段内直流线路电流的突变量最大值之和；
    所述执行单元还设置为响应于确定所述N个时刻中存在N 1个时刻中的每一个时刻直流线路电流的突变量均大于记忆启动阈值与乘以所述预设比例系数的对应时刻之前的时间段内直流线路电流的突变量最大值之和，启动直流输电线路保护，其中，N 1≤N。
  9. 一种直流输电线路保护的启动装置，包括存储器、处理器及存储在所述存储器上并可在所述处理器上运行的计算机程序，所述计算机程序被所述处理器执行时实现如权利要求1至4中任一项所述的直流输电线路保护的启动方法。
  10. 一种存储介质，存储有信息处理程序，所述信息处理程序被处理器执行时实现如权利要求1至4中任一项所述直流输电线路保护的启动方法。
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