CN114421440B - Differential protection method for power distribution network line, terminal equipment and storage medium - Google Patents

Differential protection method for power distribution network line, terminal equipment and storage medium Download PDF

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Publication number
CN114421440B
CN114421440B CN202111646158.2A CN202111646158A CN114421440B CN 114421440 B CN114421440 B CN 114421440B CN 202111646158 A CN202111646158 A CN 202111646158A CN 114421440 B CN114421440 B CN 114421440B
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electric quantity
time
terminal
value
information
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CN114421440A (en
Inventor
徐成斌
谢映宏
李蔚凡
崔哲
李小伟
苏宗洲
何繁荣
李露
张凯
李成龙
肖�琳
李声东
陈晓明
钟志章
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CYG Sunri Co Ltd
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CYG Sunri Co Ltd
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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
    • 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
    • H02H7/262—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 switching or blocking orders

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Abstract

The application is applicable to the technical field of differential protection, and provides a differential protection method, terminal equipment and storage medium for a power distribution network line, wherein the method comprises the following steps: after receiving the first information sent by the first terminal, the second terminal calculates an electric quantity difference value based on a first electric quantity value and a corresponding second electric quantity value in the first information, and when the number of the electric quantity difference values larger than a preset difference value in the obtained electric quantity difference values is larger than the preset number and sampling time corresponding to the electric quantity difference values larger than the preset difference value of the preset number is continuous, the second terminal and the first terminal perform differential protection on the power distribution network line; according to the method and the device, after the first information is acquired, the first information can be processed, the fixed time is not needed or the processing is performed after enough data are needed, the data sent by the first terminal are processed in real time, the line faults can be found in time, so that the differential protection can be performed on the line in time, and the differential protection efficiency is improved.

Description

Differential protection method for power distribution network line, terminal equipment and storage medium
Technical Field
The application belongs to the technical field of differential protection, and particularly relates to a differential protection method, terminal equipment and storage medium for a power distribution network line.
Background
Along with the development of science and technology and the continuous improvement of living standard of people, the scale of a power distribution network is continuously enlarged, the complexity is continuously improved, if a line breaks down at a certain place, the main switch of the line in an upper-level substation is tripped, and the whole line is powered off. Therefore, the differential protection of the power distribution network is more important, and the differential protection of the power distribution network can realize the rapid positioning and isolation of fault intervals.
At present, when differential protection is performed, if data sent by a contralateral is received, the data sent by the contralateral is stored, and after the stored data reaches a certain amount or reaches a preset time, the received contralateral data is processed, so as to determine whether a line fails. The method can process the data after waiting for a period of time, so that line faults cannot be found in time, and the differential protection efficiency is low.
Disclosure of Invention
The embodiment of the application provides a differential protection method, terminal equipment and storage medium for a power distribution network line, which can solve the problem of low differential protection efficiency.
In a first aspect, an embodiment of the present application provides a differential protection method for a power distribution network line, which is applied to a power distribution network protection system, where the system includes a first terminal and a second terminal, the first terminal is configured to collect a first electric quantity value of a first node in the power distribution network line at a preset time interval, and the second terminal is configured to collect a second electric quantity value of a second node in the power distribution network line at the preset time interval;
The method comprises the following steps:
in response to receiving first information sent by the first terminal, the second terminal obtains an electric quantity difference value of the first node and the second node at the sampling time based on a first electric quantity value and a second electric quantity value which is the same as the sampling time of the first electric quantity value in the first information, wherein the first information comprises at least one first electric quantity value and a unique sampling time corresponding to each first electric quantity value;
determining the number of first difference values, wherein the first difference values are electric quantity difference values larger than a preset difference value in the obtained electric quantity difference values;
when the number of the first difference values is greater than a preset number and sampling time corresponding to the first difference values of the preset number is continuous, the second terminal performs differential protection on the power distribution network line, and the second terminal sends a first instruction to the first terminal, wherein the first instruction is used for indicating the first terminal to perform differential protection on the power distribution network line.
In a second aspect, an embodiment of the present application provides a differential protection system for a power distribution network, including: the power distribution network comprises a first terminal and a second terminal, wherein the first terminal is used for collecting first electric quantity values of a first node in the power distribution network line according to a preset time interval, and the second terminal is used for collecting second electric quantity values of a second node in the power distribution network line according to the preset time interval;
The second terminal is used for realizing the differential protection method of the power distribution network line.
In a third aspect, an embodiment of the present application provides a terminal device, including:
the information processing module is used for responding to the received first information sent by the first terminal, and the second terminal obtains the electric quantity difference value of the first node and the second node at the sampling time based on a first electric quantity value in the first information and a second electric quantity value which is the same as the sampling time of the first electric quantity value, wherein the first information comprises at least one first electric quantity value and a unique sampling time corresponding to each first electric quantity value;
the judging module is used for determining the number of first difference values, wherein the first difference values are electric quantity difference values which are larger than a preset difference value in the obtained electric quantity difference values;
the differential protection module is configured to perform differential protection on the power distribution network line by using the second terminal when the number of the first differences is greater than a preset number and sampling time corresponding to the first differences of the preset number is continuous, and the second terminal sends a first instruction to the first terminal, where the first instruction is used to instruct the first terminal to perform differential protection on the power distribution network line.
In a fourth aspect, an embodiment of the present application provides a terminal device, including: a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the method of differential protection of a distribution network line according to any of the above-mentioned first aspects when executing the computer program.
In a fifth aspect, an embodiment of the present application provides a computer readable storage medium, where a computer program is stored, where the computer program, when executed by a processor, implements the differential protection method of the power distribution network line according to any one of the first aspect above.
In a sixth aspect, embodiments of the present application provide a computer program product, which when run on a terminal device, causes the terminal device to perform the method for differential protection of a power distribution network line according to any one of the first aspects above.
Compared with the prior art, the embodiment of the first aspect of the application has the beneficial effects that: after receiving first information sent by a first terminal, the second terminal calculates an electric quantity difference value based on a first electric quantity value and a corresponding second electric quantity value in the first information, and when the number of the electric quantity difference values larger than a preset difference value in the obtained electric quantity difference values is larger than the preset number and sampling time corresponding to the electric quantity difference values larger than the preset difference value of the preset number is continuous, the second terminal and the first terminal conduct differential protection on a power distribution network line; according to the method and the device, after the first information is acquired, the first information can be processed, the fixed time is not needed or the processing is performed after enough data are needed, the data sent by the first terminal are processed in real time, the line faults can be found in time, so that the differential protection can be performed on the line in time, and the differential protection efficiency is improved.
It will be appreciated that the advantages of the second to sixth aspects may be found in the relevant description of the first aspect, and are not described here again.
Drawings
Fig. 1 is a schematic structural diagram of a differential protection system for a power distribution network according to an embodiment of the present disclosure;
fig. 2 is a schematic flow chart of a differential protection method for a power distribution network according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a second terminal according to an embodiment of the present application receiving a plurality of first electric quantity values at the same time;
fig. 4 is a second flow chart of a differential protection method for a power distribution network according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of the same message Wen Yan of the first terminal according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a first terminal according to an embodiment of the present application, where a message delay of the first terminal is greater than a maximum waiting time;
fig. 7 is a schematic flow chart of processing first information by a second terminal according to an embodiment of the present application;
fig. 8 is a flowchart of a differential protection method for a power distribution network according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a terminal device according to an embodiment of the present application;
Fig. 10 is a schematic structural diagram of a terminal device according to another embodiment of the present application.
Detailed Description
It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
In addition, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
Because differential protection requires rapid localization and isolation of fault areas in the distribution network lines, differential protection has high requirements for the communication speed between protection devices. At present, optical fiber communication can meet the requirement of high-speed communication between protection devices, but the optical fiber communication is high in laying cost and insufficient in underground pipelines, so that optical fiber differential protection cannot be popularized and can only be used in a small number of areas.
The 5G communication technology has the characteristics of high bandwidth, low time delay and safety and reliability, and provides a new implementation way for differential protection. The 5G communication technology is combined with the differential protection, so that the input cost of the differential protection can be effectively reduced, the fault isolation time is shortened from a few minutes to tens of milliseconds, and the fault power failure range and the isolation time are compressed to the greatest extent.
Fig. 1 is a schematic diagram of a differential protection system for a power distribution network according to an embodiment of the present application, where the differential protection of the power distribution network may be used for differential protection of the power distribution network. The first terminal 10 is configured to collect a first electrical quantity value of a first node in the power distribution network according to a preset time interval, and send the collected first electrical quantity value to the second terminal 20 in real time. The second terminal 20 is configured to collect a second electrical quantity value of a second node in the power distribution network line at a preset time interval. And electric equipment is arranged between the first node and the second node.
The second terminal 20 is further configured to process the first electric quantity value after receiving the first electric quantity value sent by the first terminal 10, determine whether the power distribution network line fails at the current time, and enter a differential protection state when the power distribution network line fails, so as to perform differential protection on the power distribution network line. When the power distribution network line fails, the second terminal 20 may further send a first instruction to the first terminal, and after the first terminal 10 receives the first instruction, the first terminal 10 enters a differential protection state to perform differential protection on the power distribution network line.
The first terminal 10 and the second terminal 20 may each be a differential protector.
In this embodiment, the system may further include a first time-correcting device for correcting the time of the first terminal and a second time-correcting device for correcting the time of the second terminal.
The first timing device performs timing on the first terminal by transmitting a serial time exchange code (IRIG-B code) to the first terminal. The second timing device performs timing on the second terminal by transmitting a serial time exchange code (IRIG-B code) to the second terminal. The clocks of the first terminal and the second terminal can be synchronized through IRIG-B codes, and further synchronization of the acquired value of the first terminal and the acquired value of the second terminal is achieved. And transmitting data between the first terminal and the second terminal through SV messages.
The following describes in detail the differential protection method of the power distribution network line according to the embodiment of the present application with reference to fig. 1. The method may be implemented in a second terminal. The first terminal and the second terminal may acquire the current value at the same preset time interval. The preset time interval may be set as needed, for example, the preset time interval may be set to 1ms. For ease of illustration, the embodiments herein are each illustrated with a preset time interval of 1ms.
Fig. 2 shows a schematic flow chart of a differential protection method for a power distribution network provided in the present application, and referring to fig. 2, the method is described in detail as follows:
s101, responding to receiving first information sent by a first terminal, and obtaining an electric quantity difference value of the first node and the second node at the sampling time by the second terminal based on a first electric quantity value in the first information and a second electric quantity value which is the same as the sampling time of the first electric quantity value.
In this embodiment, the first information includes at least one first electric quantity value and a unique sampling time corresponding to each first electric quantity value;
specifically, the second terminal obtains a second electric quantity value acquired by the second terminal at the sampling time based on the sampling time in the first information, and obtains an electric quantity difference value of the first node and the second node at the sampling time based on the first electric quantity value and the second electric quantity value which are the same in the sampling time.
In this embodiment, the first terminal collects the first electric quantity value according to a preset time interval, and after each time the first terminal collects a first electric quantity value, the first electric quantity value is sent to the second terminal in real time. The second terminal cannot receive the first power value immediately after the first terminal transmits the first power value due to network delay or network communication difference.
For example, if the network delay is 10ms-20ms, the first terminal may send a first power value to the second terminal at the current time, and the second terminal may receive the first power value after 10 ms.
In this embodiment, after the second terminal receives the first electric quantity value sent by the first terminal at the current time, the second terminal may process the received first electric quantity value at the current time without waiting. The first electrical quantity value may comprise a first voltage value and/or a first current value. When the first terminal sends the first electric quantity value to the second terminal, the first terminal needs to send the sampling time of the first electric quantity value to the second terminal together, so that the second terminal can determine the sampling time of the first electric quantity value.
In this embodiment, due to network delay, the first power value received by the second terminal each time may be one or more, for example, the second terminal receives 3 first power values at a time at the current time, which are the first power values collected by the first terminal at sampling times of 4ms, 5ms and 6ms, respectively.
Specifically, after receiving the first information, the second terminal searches for the second electric quantity values acquired by the second terminal when the sampling time of each first electric quantity value is the smallest from the first electric quantity value with the smallest sampling time in the first information, and arranges the second electric quantity values according to the sequence of the sampling times.
Specifically, a difference value of the first electric quantity value minus the second electric quantity value is calculated, and the difference value of the first electric quantity value minus the second electric quantity value is the electric quantity difference value.
Specifically, the first electric quantity values in the first information are arranged according to the sequence of sampling time, and a first sequence is obtained. And arranging the second electric quantity values obtained according to the sampling time in the first information according to the sequence of the sampling time to obtain a second sequence. The first sequence and the second sequence are time aligned. And calculating the electric quantity difference value according to the first electric quantity value and the second electric quantity value which are the same in sampling time.
Specifically, the first electric quantity value in the first information may be processed in parallel. The first electric quantity value in the first information can be processed sequentially according to the sampling time.
S102, determining the number of first difference values, wherein the first difference values are electric quantity difference values larger than a preset difference value in the obtained electric quantity difference values.
In this embodiment, after obtaining the electric quantity difference value corresponding to the sampling time in the first information according to the first electric quantity value in the first information, counting the electric quantity difference value greater than the preset difference value in the electric quantity difference value obtained from the start of calculating the electric quantity difference value to the current time by the second terminal, where the electric quantity difference value greater than the preset difference value is recorded as the first difference value.
In this embodiment, the preset difference may be set as needed.
For example, if the sampling time is 4ms according to the first electric quantity value in the first information, the corresponding electric quantity difference value is obtained. The second terminal has calculated 1ms, 2ms and 3ms before the current time, respectively corresponding power differences. And searching the electric quantity difference value which is larger than a preset difference value in the electric quantity difference values corresponding to 1ms, 2ms, 3ms and 4 ms. If the electric quantity difference value corresponding to 2ms and 4ms is larger than the preset difference value, the number of the first difference values is 2.
In this embodiment, after each calculation of the second terminal to obtain an electric quantity difference value, the number of first difference values can be determined once, so as to determine whether to perform differential protection.
And S103, when the number of the first difference values is larger than the preset number and sampling time corresponding to the first difference values of the preset number is continuous, the second terminal performs differential protection on the power distribution network line, and sends a first instruction to the first terminal, wherein the first instruction is used for indicating the first terminal to perform differential protection on the power distribution network line.
In this embodiment, the sampling time corresponding to the first difference is the sampling time corresponding to the first electric quantity value or the second electric quantity value that obtains the first difference.
For example, if the first electric quantity corresponding to 4ms is a, the second electric quantity corresponding to 4ms is B. A-b=c, C is greater than the preset difference, and C is the first difference. C corresponds to a sampling time of 4ms.
In this embodiment, the sampling time sequences corresponding to the first differences are continuous in time sequence composed of the sampling times corresponding to the respective first differences.
By way of example, if the first difference comprises a, b, c and d. And a corresponds to 2ms, b corresponds to 3ms, c corresponds to 4ms and d corresponds to 5ms. Since 2, 3, 4 and 5ms are consecutive time sequences, the sampling time corresponding to the first difference value is consecutive.
If the sampling time corresponding to a is 2ms, the sampling time corresponding to b is 4ms, the sampling time corresponding to c is 5ms, and the sampling time corresponding to d is 7ms. Since 2, 4, 5 and 7ms are discontinuous time sequences, the sampling time corresponding to the first difference is discontinuous.
In this embodiment, after the second terminal determines that the number of the first differences is greater than the preset number and sampling time corresponding to the first differences of the preset number is continuous, the second terminal enters a differential protection state to perform differential protection on the power distribution network line.
In this embodiment, the preset number may be set as needed. The preset number may be set to a value less than or equal to the differential protection time.
By way of example only,as shown in fig. 3, the network delay is the communication delay T in the figure 1 The communication delay is 10ms-20ms. The opposite side terminal is a first terminal, and the home side terminal is a second terminal. The first terminal is at T 0 Collect C 0 Collecting according to preset time intervals in sequence. The second terminal is also at T 0 Collect C 0 Collecting according to preset time intervals in sequence. The second terminal receives first information sent by the first terminal, wherein the first information comprises C acquired by the first terminal 0 To C n-1 N-1 data total. After receiving the first information, the second terminal starts to process the first electric quantity value in the first information. After a electricity quantity difference is calculated, if the a electricity quantity difference is larger than the preset difference, the second terminal is at T 1 +T 2 Differential protection is started at this time.
In this embodiment, if the number of the first differences is smaller than or equal to the preset number, and/or sampling time corresponding to the first differences of the preset number is discontinuous, the second terminal continues to receive the first information sent by the first terminal, and processes the received first information until the second terminal determines that the number of the first differences is greater than the preset number, and sampling time corresponding to the first differences of the preset number is continuous, and the second terminal performs differential protection on the power distribution network line.
In the embodiment of the application, after receiving the first information sent by the first terminal, the second terminal obtains a second electric quantity value acquired by the second terminal at the acquisition time based on the sampling time in the first information; calculating an electric quantity difference value based on the first electric quantity value and the corresponding second electric quantity value, and performing differential protection on the power distribution network line by the second terminal and the first terminal when the number of the electric quantity difference values larger than the preset difference value in the obtained electric quantity difference values is larger than the preset number and the sampling time corresponding to the electric quantity difference values larger than the preset difference value of the preset number is continuous; according to the method and the device, after the first information is acquired, the first information can be processed without obtaining fixed time or waiting for enough data, the data sent by the first terminal are processed in real time, and the line faults can be found in time, so that the line is subjected to differential protection in time, the differential protection efficiency is improved, and the self-adaptive adjustment of differential protection delay is realized.
As shown in fig. 4, in one possible implementation manner, after receiving the first information, the second terminal may further include, before obtaining, based on a sampling time in the first information, a second power value acquired by the second terminal at the sampling time, the method further includes:
S201, determining the minimum sampling time in the first information, wherein the minimum sampling time in the first information is used as the first time.
In this embodiment, the minimum value of the sampling time included in the first information is searched, and the minimum value of the sampling time in the first information is recorded as the first time.
If the first information includes a sampling time, the sampling time is the first time.
S202, determining the maximum sampling time in the second information, wherein the maximum sampling time in the second information is used as the second time.
In this embodiment, the second information is information sent by the first terminal and received by the second terminal last time before the first information is received.
For example, if the current time is 8ms, the second terminal receives the first information at the current time. When the second terminal receives the first information sent by the first terminal last time, which is 6ms, the first information received by the second terminal at 6ms is recorded as second information.
In this embodiment, the maximum value of the sampling time included in the second information is found, and the maximum value of the sampling time in the first information is recorded as the second time.
If the second information includes a sampling time, the sampling time is the second time.
S203, judging whether the second difference value between the first time and the second time is the preset time interval.
Correspondingly, the implementation procedure of step S101 may include:
and if the second difference value is the preset time interval, the second terminal obtains the electric quantity difference value of the first node and the second node at the sampling time based on a first electric quantity value in the first information and a second electric quantity value which is the same as the sampling time of the first electric quantity value.
In this embodiment, whether the first time and the second time are the preset time interval is mainly used to determine whether the first acquisition time in the first information and the last acquisition time in the second information are continuous. If the first acquisition time in the first information is continuous with the last acquisition time in the second information, the fact that other acquisition time does not exist between the first information and the second information, that is, other first electric quantity values do not exist between the first information and the second information, the second terminal receives the first electric quantity values in sequence, and the first electric quantity values received by the second terminal do not have missing first electric quantity values. The second terminal may start to calculate the power difference value corresponding to the first power value in the first information.
For example, if the minimum sampling time in the first information is 8ms, the first time is 8ms, and the maximum sampling time in the second information is 7ms, the second time is 7ms. The second difference between the first time and the second time is 1ms. The second difference is a preset time interval.
As an example, as shown in fig. 5, the shortest network delay is the shortest communication delay in the figure, and the shortest communication delay is 10ms. The opposite side terminal is a first terminal, and the home side terminal is a second terminal. The first terminal is at T 0 Collect C 0 Collecting according to preset time intervals in sequence. The second terminal is also at T 0 Collect C 0 Collecting according to preset time intervals in sequence. The second terminal starts to receive first information sent by the first terminal according to a preset time interval after 10ms, and each first information comprises a first electric quantity value. The second terminal starts to sequentially calculate the difference between the electric quantity of the first electric quantity value and the electric quantity of the second electric quantity value after 10ms. After the a electric quantity difference values are calculated, the a electric quantity difference values are larger than the preset difference value, and the second terminal starts differential protection.
S204, if the second difference value is larger than the preset time interval, determining that a first electric quantity value which is missing exists between the first information and the second information.
In this embodiment, if the second difference is greater than the preset time interval, it is indicated that there is still a sampling time between the first time and the second time, and naturally there is also a first electric quantity value that is not received by the second terminal. The first electric quantity value between the first information and the second information which are not received by the second terminal is the missing first electric quantity value.
For example, if the first time is 8ms and the second time is 5ms, the difference between the first time and the second time is greater than 1ms, which is a preset time interval, and the second terminal does not receive the first electric quantity value acquired by the first terminal at 6ms and 7 ms. The first electric quantity value acquired by the first terminal at 6ms and 7ms is the first electric quantity value missing between the first information and the second information.
S205, obtaining a first maximum waiting time corresponding to each missing first electric quantity value based on the second time, the preset network delay and the preset differential delay.
Specifically, a third difference value between the time of receiving the second information and the second time is calculated, wherein the third difference value is the network delay time. And calculating a fourth difference value between the maximum value of the preset network delay time and the third difference value. And calculating the sum of the fourth difference value, the preset differential delay and the time for receiving the second information to obtain candidate time.
If the missing first electric quantity value is one, the candidate time plus the preset time interval is the first maximum waiting time corresponding to the electric quantity value.
If the missing first electric quantity value is two, the first maximum waiting time of the first electric quantity value corresponding to the missing first sampling time is: the candidate time is added to the preset time interval. The first maximum latency of the first power value corresponding to the missing second sampling time is: the candidate time is added to 2 times the preset time interval.
The first waiting time corresponding to each missing first electric quantity value can be obtained through the time calculation model. The time calculation model includes:
T i ＝T 0 +[T max -(T 0 -t 2 )]+T a +i×t 0 ；
wherein T is i A first maximum waiting time corresponding to the i-th first electric quantity value which is missing; t (T) max The maximum network delay is preset; t (T) 0 Time for receiving the second information; t is t 2 Is a second time; t (T) a Is a preset differential delay; 1.ltoreq.i.ltoreq.n, n being the total number of missing first electric quantity values; t is t 0 For a preset time interval.
For example, the time for the second terminal to receive the second information is 14ms, the preset maximum network delay is 20ms, the preset time interval is 1ms, and the preset differential delay is 8ms. If the last sampling time in the second information is 4ms, the first sampling time in the first information is 7ms. The first electric quantity value corresponding to 5ms and 6ms is missing between the first information and the second information.
The first maximum waiting time of the first electric quantity value corresponding to 5ms can be obtained by the time calculation model, and the first maximum waiting time is as follows: 14+ [20- (14-4) ] +8+1×1=33 ms. The first maximum latency for the first power value corresponding to 6ms is: 14+ [20- (14-4) ] +8+2×1=34 ms.
S206, determining whether a first electric quantity value corresponding to the missing is received within the first maximum waiting time.
Correspondingly, the implementation procedure of step S101 may include:
and if the first electric quantity value corresponding to the missing first electric quantity value is not received in each first maximum waiting time, the second terminal obtains the electric quantity difference value of the first node and the second node at the sampling time based on the first electric quantity value in the first information and the second electric quantity value which is the same as the sampling time of the first electric quantity value.
In this embodiment, after the first maximum waiting time is determined, the first information sent by the first terminal may be continuously received, and then it is determined whether the corresponding first electric quantity value may be received within the first maximum waiting time. If the first electric quantity value is not received in one first maximum waiting time, the first terminal does not wait, continuously judges whether the corresponding first electric quantity value is received in the next first maximum waiting time, and after each first maximum waiting time is judged to be finished, the missing first electric quantity value is not received, and the second terminal starts to process the first electric quantity value in the first information. As shown in fig. 6, when the waiting time exceeds the maximum waiting time, for example, when the delay of C0 exceeds ts+ta, the waiting is not performed, the processing of C0 data is not performed any more, and the waiting is continued for receiving the next data.
For example, if the first maximum waiting time corresponding to the missing first electric quantity value of 5ms is 33ms, the first maximum waiting time corresponding to the missing first electric quantity value of 6ms is 34ms. If the first electric quantity value corresponding to 6ms is not received within 33ms, continuing to judge whether the first electric quantity value corresponding to 6ms is received within 34ms, and if the first electric quantity value corresponding to 6ms is not received within 34ms, not waiting, and starting to process the first electric quantity value in the first information by the second terminal.
S207, if the corresponding missing first electric quantity value is received within the first maximum waiting time, determining a second electric quantity value acquired by the second terminal at a third time based on the third time, wherein the third time is the sampling time of the missing first electric quantity value received within the first maximum waiting time.
In this embodiment, if the corresponding first electric quantity value is received within the first maximum waiting time, the second electric quantity value acquired by the second terminal at the sampling time may be determined based on the sampling time of the received first electric quantity value.
And S208, obtaining the electric quantity difference value of the first node and the second node at the third time based on the first electric quantity value corresponding to the third time and the second electric quantity value corresponding to the third time.
Correspondingly, the implementation procedure of step S101 may include:
and if the number of the first difference values is smaller than or equal to the preset number, and/or sampling time corresponding to the first difference values of the preset number is discontinuous, the second terminal obtains the electric quantity difference values of the first node and the second node at the sampling time based on a first electric quantity value in the first information and a second electric quantity value which is the same as the sampling time of the first electric quantity value.
In this embodiment, after the power difference corresponding to the third time is obtained, the number of the first differences may be determined by using the step of step S102. If the number of the first difference values is smaller than the preset number, the second terminal can calculate the electric quantity difference value according to the first electric quantity value in the first information. And/or the sampling time corresponding to the first difference value of the preset number is discontinuous, and the second terminal can calculate the electric quantity difference value according to the first electric quantity value in the first information.
In this embodiment, whether a missing first electric quantity value needs to be waited is determined according to sampling time in the first information and sampling time in the second information, if the missing first electric quantity value needs to be waited, the received missing first electric quantity value is processed after the first electric quantity value is received in the first maximum waiting time, and then the first electric quantity value in the first information is processed. If the first power value is not received within the first maximum wait time, processing of the first power value in the first information may begin. According to the differential protection method and device, the first electric quantity value is processed sequentially, omission of the first electric quantity value is prevented, and the differential protection delay time is prevented from being prolonged due to misjudgment of the lost first electric quantity value when differential protection is needed.
As shown in fig. 7, in one possible implementation, after determining that the first electric quantity value in the first information needs to be processed, the implementation of step S101 may include:
s1011, determining whether sampling time in the first information is continuous or not based on the preset time interval.
In this embodiment, the sampling times in the first information are arranged in chronological order. If the difference values before two adjacent sampling times in the arranged sampling times are all preset time intervals, determining that the sampling times in the first information are continuous.
And S1012, if the sampling time in the first information is continuous, the second terminal obtains a second electric quantity value acquired by the second terminal at the sampling time based on the sampling time in the first information.
In this embodiment, if the sampling time in the first information is continuous, the first electric quantity value in the first information is processed. The second terminal searches a second electric quantity value corresponding to each sampling time in the first information.
And S1013, obtaining the electric quantity difference value of the first node and the second node at the sampling time based on the first electric quantity value and the second electric quantity value of the same sampling time.
Specifically, the implementation process of step S1012 and step S1013 refers to step S101, which is not described herein.
S1014, if the sampling time in the first information is discontinuous, grouping the first electric quantity values in the first information according to the sequence of the sampling time to obtain a plurality of electric quantity sets, wherein each sampling time corresponding to the first electric quantity value in each electric quantity set is continuous, and the maximum sampling time in each electric quantity set is discontinuous with the minimum sampling time in other electric quantity sets.
In this embodiment, a breakpoint in the sampling time in the first information may also be searched, and a first electric quantity value corresponding to the sampling time between two breakpoints is used as a group of electric quantity sets.
For example, if the first information includes sampling times of 5ms, 6ms, 8ms, and 9ms. A discontinuity between 6ms and 8ms may take the first electrical quantity values corresponding to 5ms and 6ms, respectively, as a group of electrical quantity sets. The first electric quantity values respectively corresponding to 8ms and 9ms are used as a group of electric quantity sets.
S1015, arranging the electric quantity sets according to the sequence of the sampling time to obtain ordered electric quantity sets.
For example, if the electric quantity set a includes first electric quantity values corresponding to 5ms and 6ms, respectively, the electric quantity set B includes first electric quantity values corresponding to 8ms and 9ms, respectively. And sequencing the electric quantity set A and the electric quantity set B, wherein the electric quantity set A is before the electric quantity set B. The electric quantity set A is the 1 st electric quantity set. The electric quantity set B is the 2 nd electric quantity set.
S1016, determining a second electric quantity value corresponding to a fourth time based on the fourth time, wherein the fourth time is the sampling time of the first electric quantity value in the 1 st electric quantity set.
In this embodiment, the second electric quantity value corresponding to the sampling time of the first electric quantity value in the 1 st electric quantity set is searched first.
S1017, obtaining the electric quantity difference value of the first node and the second node at the fourth time based on the first electric quantity value corresponding to the fourth time and the second electric quantity value corresponding to the fourth time.
In this embodiment, the step is the same as step S101, please refer to the description of step S101, and the description is omitted here.
In this embodiment, if the number of the first differences is greater than the preset number, and sampling time corresponding to the preset number of the first differences is continuous, the second terminal performs differential protection on the power distribution network line, and the second terminal sends a first instruction to the first terminal, where the first instruction is used to instruct the first terminal to perform differential protection on the power distribution network line.
As shown in fig. 8, in one possible implementation manner, after step S102, the method may further include:
s301, when the number of the first difference values is smaller than or equal to the preset number and/or sampling time corresponding to the first difference values of the preset number is discontinuous, obtaining second maximum waiting time corresponding to each first electric quantity value missing between the 1 st electric quantity set and the 2 nd electric quantity set based on the maximum sampling time in the 1 st electric quantity set, the preset maximum network delay and the preset differential delay.
In this embodiment, the second maximum waiting time may be according to the formula:
T j ＝T f +[T max -(T f -t 2 )]+T a +j×t 0 ；
wherein T is j A second maximum waiting time corresponding to the j-th first electric quantity value which is missing; t (T) max The maximum network delay is preset; t (T) f Time for receiving the first information; t is t 2 The maximum sampling time in the 1 st electric quantity set; t (T) a Is a preset differential delay; i is more than or equal to 1 and less than or equal to m, wherein m is the total number of first electric quantity values missing between the second electric quantity sets of the first electric quantity set; t is t 0 For a preset time interval.
And S302, if the first electric quantity value corresponding to the missing is not received in each second maximum waiting time, determining a second electric quantity value corresponding to a fifth time based on the fifth time, wherein the fifth time is the sampling time of the first electric quantity value in the 2 nd electric quantity set.
In this embodiment, if the first electric quantity value corresponding to the missing is not received within the second maximum waiting time, the second terminal processes the data in the 2 nd electric quantity set.
Specifically, according to the sampling time in the 2 nd electric quantity set, determining a second electric quantity value acquired by the second terminal at each sampling time in the 2 nd electric quantity set.
S303, obtaining the electric quantity difference value of the first node and the second node at the fifth time based on the first electric quantity value corresponding to the fifth time and the second electric quantity value corresponding to the fifth time.
And S304, if the first electric quantity value corresponding to the missing is received in the second maximum waiting time, determining a second electric quantity value acquired by the second terminal in the sixth time based on the sixth time, wherein the sixth time is the sampling time of the first electric quantity value corresponding to the missing received in the second maximum waiting time.
In this embodiment, the present step is similar to the step S207 described above, please refer to the description of the step S207, and the description is omitted herein.
And S305, obtaining the electric quantity difference value of the first node and the second node at the sixth time based on the first electric quantity value corresponding to the sixth time and the second electric quantity value corresponding to the sixth time.
S306, determining the number of first difference values, wherein the first difference values are electric quantity difference values larger than a preset difference value in the obtained electric quantity difference values.
S307, when the number of the first difference values is greater than a preset number and sampling time corresponding to the first difference values of the preset number is continuous, the second terminal performs differential protection on the power distribution network line, and the second terminal sends a first instruction to the first terminal, wherein the first instruction is used for indicating the first terminal to perform differential protection on the power distribution network line.
In this embodiment, if the first information includes the 3 rd electric quantity set, the 4 th electric quantity set, and the like, after executing step S306, if the number of the first difference values is less than or equal to the preset number, and/or sampling time corresponding to the preset number of the first difference values is discontinuous, the steps S301 to S306 are continuously executed in a circulating manner until the number of the first difference values is greater than the preset number, and sampling time corresponding to the preset number of the first difference values is continuous, or all the first electric quantity values in the first information are processed.
In this embodiment, if the first information includes only the 1 st electric quantity set and the 2 nd electric quantity set, and the number of the first difference values is smaller than or equal to the preset number, and/or sampling time corresponding to the first difference values of the preset number is discontinuous, the second terminal continues to receive the first information sent by the first terminal, and the differential protection method in this application is circularly executed.
In one possible implementation, the second terminal interrupt time is the same as the preset time interval, and one interrupt characterization requires a difference calculation for the first power value received by the current interrupt.
The method may further include:
1. communication interrupt lockout: if the first information sent by the first terminal is not received in the continuous first preset number of interruption, the second terminal locks the differential protection, namely the electric quantity difference value is not calculated any more, and meanwhile, if the first information sent by the first terminal is not received in the second preset number, the second terminal sends alarm information, wherein the alarm information is used for prompting the second terminal to interrupt locking. As an example, the first preset number may be 3, 4, 5, or the like. The second preset number may be 10 seconds, 11 seconds, etc.
2. Synchronous abnormal locking: if the serial time exchange code received by the second terminal is abnormal or the serial time exchange code is not received, the second terminal can lock the differential protection instantaneously, and meanwhile, if the normal serial time exchange code is not received within a second preset number, the second terminal sends alarm information, wherein the alarm information is used for representing the sampling step-out of the second terminal.
3. Communication delay is too big blocked: if the delay of the continuously received third preset number of first information is greater than the preset communication maximum delay in the present year, the second terminal instantaneously locks the differential protection and sends out an alarm, wherein the alarm is used for representing that the communication delay is overlarge. The second terminal sends third information to the first terminal, wherein the third information comprises a channel abnormality mark so that the first terminal synchronously locks differential protection and alarming.
4. Pseudo-synchronous locking: the second terminal calculates the angle difference of the voltage between the first terminal and the second terminal in a preset time period based on a first voltage value in the first information; determining the number of angle differences larger than a preset value in the angle differences; and if the number of the angle differences larger than the preset value is larger than the preset number, the second terminal sends alarm information, wherein the alarm information is used for indicating that the first terminal and the second terminal are not synchronous. The preset time period may be 5 seconds, 6 seconds, etc. The preset value may be 15 degrees, 16 degrees, etc.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic of each process, and should not limit the implementation process of the embodiment of the present application in any way.
Corresponding to the differential protection method of the distribution network circuit described in the above embodiments, fig. 9 shows a block diagram of the terminal device provided in the embodiment of the present application, and for convenience of explanation, only the portion relevant to the embodiment of the present application is shown.
Referring to fig. 9, the terminal device 400 may include: an information processing module 410, a judging module 420 and a differential protection module 430.
The information processing module 410 is configured to, in response to receiving first information sent by the first terminal, obtain, by the second terminal, an electric quantity difference value between the first node and the second node at the sampling time based on a first electric quantity value in the first information and a second electric quantity value that is the same as the sampling time of the first electric quantity value, where the first information includes at least one first electric quantity value and a unique sampling time corresponding to each first electric quantity value;
the judging module 420 is configured to determine the number of first difference values, where the first difference value is an electric quantity difference value greater than a preset difference value in the obtained electric quantity difference values;
The differential protection module 430 is configured to perform differential protection on the power distribution network line by using the second terminal when the number of the first differences is greater than a preset number and sampling times corresponding to the first differences of the preset number are continuous, and the second terminal sends a first instruction to the first terminal, where the first instruction is used to instruct the first terminal to perform differential protection on the power distribution network line.
In one possible implementation, connected to the information processing module 410 further comprises:
the first time determining module is used for determining the minimum sampling time in the first information, and the minimum sampling time in the first information is used as the first time;
the second time determining module is used for determining the maximum sampling time in second information, wherein the maximum sampling time in the second information is used as the second time, and the second information is information sent by the first terminal and received by the second terminal last time before the first information is received;
the time judging module is used for judging whether the second difference value between the first time and the second time is the preset time interval or not;
correspondingly, if the second difference value is the preset time interval, the second terminal obtains the electric quantity difference value of the first node and the second node at the sampling time based on a first electric quantity value in the first information and a second electric quantity value which is the same as the sampling time of the first electric quantity value.
In one possible implementation manner, the connection with the time judging module further includes:
the electric quantity determining module is used for determining that a first electric quantity value which is missing exists between the first information and the second information if the second difference value is larger than the preset time interval;
the waiting time determining module is used for obtaining first maximum waiting time corresponding to each missing first electric quantity value based on the second time, the preset maximum network delay and the preset differential delay;
the electric quantity receiving module is used for determining whether a first electric quantity value corresponding to the missing is received within the first maximum waiting time;
correspondingly, if the first electric quantity value corresponding to the missing first electric quantity value is not received within each first maximum waiting time, the second terminal obtains the electric quantity difference value of the first node and the second node at the sampling time based on the first electric quantity value in the first information and the second electric quantity value which is the same as the sampling time of the first electric quantity value.
In one possible implementation, the power receiving module further includes:
the power value determining module is used for determining a second power value acquired by the second terminal at a third time based on the third time if the corresponding missing first power value is received within the first maximum waiting time, wherein the third time is the sampling time of the missing first power value received within the first maximum waiting time;
The calculation module is used for obtaining an electric quantity difference value of the first node and the second node at the third time based on the first electric quantity value corresponding to the third time and the second electric quantity value corresponding to the third time;
correspondingly, if the number of the first difference values is smaller than the preset number, and/or sampling time corresponding to the first difference values of the preset number is discontinuous, the second terminal obtains the electric quantity difference values of the first node and the second node at the sampling time based on a first electric quantity value in the first information and a second electric quantity value which is the same as the sampling time of the first electric quantity value.
In one possible implementation, the information processing module 410 may be specifically configured to:
determining whether sampling time in the first information is continuous or not based on the preset time interval;
if the sampling time in the first information is continuous, the second terminal obtains a second electric quantity value acquired by the second terminal at the sampling time based on the sampling time in the first information;
and obtaining the electric quantity difference value of the first node and the second node at the sampling time based on the first electric quantity value and the second electric quantity value at the same sampling time.
In one possible implementation, the information processing module 410 may be specifically configured to:
if the sampling time in the first information is discontinuous, grouping the first electric quantity values in the first information according to the sequence of the sampling time to obtain a plurality of electric quantity sets, wherein each sampling time corresponding to the first electric quantity value in each electric quantity set is continuous, and the maximum sampling time in each electric quantity set is discontinuous with the minimum sampling time in other electric quantity sets;
arranging the electric quantity sets according to the sequence of the sampling time to obtain ordered electric quantity sets;
determining a second electric quantity value corresponding to fourth time based on the fourth time, wherein the fourth time is the sampling time of the first electric quantity value in the 1 st electric quantity set;
and obtaining the electric quantity difference value of the first node and the second node at the fourth time based on the first electric quantity value corresponding to the fourth time and the second electric quantity value corresponding to the fourth time.
In one possible implementation, connected to the determining module 420 further includes:
a second waiting time determining module, configured to obtain, when the number of the first difference values is less than or equal to the preset number, and/or sampling times corresponding to the first difference values of the preset number are discontinuous, a second maximum waiting time corresponding to each first electric quantity value missing between the 1 st electric quantity set and the 2 nd electric quantity set based on a maximum sampling time in the 1 st electric quantity set, a preset maximum network delay and a preset differential delay;
The first electric quantity searching module is used for determining a second electric quantity value corresponding to a fifth time based on the fifth time if the first electric quantity value corresponding to the missing is not received in each second maximum waiting time, wherein the fifth time is the sampling time of the first electric quantity value in the 2 nd electric quantity set;
the first difference calculation module is used for obtaining the electric quantity difference value of the first node and the second node at the fifth time based on the first electric quantity value corresponding to the fifth time and the second electric quantity value corresponding to the fifth time;
the second electric quantity searching module is used for determining a second electric quantity value acquired by the second terminal at a sixth time based on a sixth time if the corresponding missing first electric quantity value is received within the second maximum waiting time, wherein the sixth time is the sampling time of the missing first electric quantity value received within the second maximum waiting time;
the second difference calculation module is used for obtaining the electric quantity difference value of the first node and the second node at the sixth time based on the first electric quantity value corresponding to the sixth time and the second electric quantity value corresponding to the sixth time;
The number determining module is used for determining the number of first difference values, wherein the first difference values are electric quantity difference values larger than a preset difference value in the obtained electric quantity difference values;
the instruction sending module is configured to perform differential protection on the power distribution network line by using the second terminal when the number of the first differences is greater than a preset number and sampling time corresponding to the first differences of the preset number is continuous, and the second terminal sends a first instruction to the first terminal, where the first instruction is used to instruct the first terminal to perform differential protection on the power distribution network line.
In one possible implementation, the apparatus 400 further includes:
the angle difference calculation module is used for calculating the angle difference of the voltage between the first terminal and the second terminal in a preset time period based on a first voltage value in the first information;
the quantity determining module is used for determining the quantity of the angle differences larger than a preset value in the angle differences;
and the alarm module is used for sending alarm information to the second terminal if the number of the angle differences larger than the preset value is larger than the preset number, wherein the alarm information is used for indicating that the first terminal and the second terminal are not synchronous.
It should be noted that, because the content of information interaction and execution process between the above devices/units is based on the same concept as the method embodiment of the present application, specific functions and technical effects thereof may be referred to in the method embodiment section, and will not be described herein again.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
The embodiment of the present application further provides a terminal device, referring to fig. 10, the terminal device 500 may include: at least one processor 510, a memory 520, and a computer program stored in the memory 520 and executable on the at least one processor 510, the processor 510, when executing the computer program, performing the steps of any of the various method embodiments described above, such as steps S101 to S103 in the embodiment shown in fig. 2. Alternatively, the processor 510 may perform the functions of the modules/units of the apparatus embodiments described above, such as the functions of the modules 410-430 shown in fig. 9, when executing the computer program.
By way of example, a computer program may be partitioned into one or more modules/units that are stored in memory 520 and executed by processor 510 to complete the present application. The one or more modules/units may be a series of computer program segments capable of performing specific functions for describing the execution of the computer program in the terminal device 500.
It will be appreciated by those skilled in the art that fig. 10 is merely an example of a terminal device and is not limiting of the terminal device and may include more or fewer components than shown, or may combine certain components, or different components, such as input-output devices, network access devices, buses, etc.
The processor 510 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 520 may be an internal storage unit of the terminal device, or may be an external storage device of the terminal device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card), or the like. The memory 520 is used to store the computer program and other programs and data required by the terminal device. The memory 520 may also be used to temporarily store data that has been output or is to be output.
The method for dynamically expanding the relational database provided by the embodiment of the application can be applied to terminal equipment such as computers, tablet computers, notebook computers, netbooks, personal digital assistants (personal digital assistant, PDA) and the like, and the embodiment of the application does not limit the specific types of the terminal equipment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed terminal device, apparatus and method may be implemented in other manners. For example, the above-described embodiments of the terminal device are merely illustrative, e.g., the division of the modules or units is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present application may implement all or part of the flow of the method of the above-described embodiments, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by one or more processors, the computer program may implement the steps of each of the method embodiments described above.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present application may implement all or part of the flow of the method of the above-described embodiments, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by one or more processors, the computer program may implement the steps of each of the method embodiments described above.
Also, as a computer program product, the steps of the various method embodiments described above may be implemented when the computer program product is run on a terminal device, causing the terminal device to execute. Wherein the computer program comprises computer program code. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims (9)

1. The differential protection method for the power distribution network line is characterized by being applied to a power distribution network protection system, wherein the system comprises a first terminal and a second terminal, the first terminal is used for collecting first electric quantity values of a first node in the power distribution network line according to a preset time interval, and the second terminal is used for collecting second electric quantity values of a second node in the power distribution network line according to the preset time interval;
the method comprises the following steps:
in response to receiving first information sent by the first terminal, determining the minimum sampling time in the first information, wherein the minimum sampling time in the first information is used as first time;
Determining the maximum sampling time in second information, wherein the maximum sampling time in the second information is taken as the second time, and the second information is information sent by the first terminal and received by the second terminal last time before the first information is received;
judging whether a second difference value between the first time and the second time is the preset time interval or not;
if the second difference value is the preset time interval, the second terminal obtains the electric quantity difference value of the first node and the second node at the sampling time based on a first electric quantity value in first information and a second electric quantity value which is the same as the sampling time of the first electric quantity value, wherein the first information comprises at least one first electric quantity value and a unique sampling time corresponding to each first electric quantity value;
determining the number of first difference values, wherein the first difference values are electric quantity difference values larger than a preset difference value in the obtained electric quantity difference values;
when the number of the first difference values is greater than a preset number and sampling time corresponding to the first difference values of the preset number is continuous, the second terminal performs differential protection on the power distribution network line, and the second terminal sends a first instruction to the first terminal, wherein the first instruction is used for indicating the first terminal to perform differential protection on the power distribution network line.
2. The method of differential protection of a power distribution network according to claim 1, further comprising, after said determining whether the second difference between the first time and the second time is the preset time interval:
if the second difference value is larger than the preset time interval, determining that a first electric quantity value with a deletion exists between the first information and the second information;
obtaining a first maximum waiting time corresponding to each missing first electric quantity value based on the second time, a preset maximum network delay and a preset differential delay;
determining whether a first electrical quantity value corresponding to a miss is received within the first maximum wait time;
correspondingly, if the first electric quantity value corresponding to the missing first electric quantity value is not received within each first maximum waiting time, the second terminal obtains the electric quantity difference value of the first node and the second node at the sampling time based on the first electric quantity value in the first information and the second electric quantity value which is the same as the sampling time of the first electric quantity value.
3. The method of differential protection of a power distribution network line according to claim 2, further comprising, after said determining if a corresponding missing first electrical quantity value is received within said first maximum waiting time:
If the first electric quantity value corresponding to the missing is received in the first maximum waiting time, determining a second electric quantity value acquired by the second terminal at a third time based on the third time, wherein the third time is the sampling time of the first electric quantity value of the missing received in the first maximum waiting time;
obtaining an electric quantity difference value of the first node and the second node at the third time based on the first electric quantity value corresponding to the third time and the second electric quantity value corresponding to the third time;
correspondingly, if the number of the first difference values is smaller than the preset number, and/or sampling time corresponding to the first difference values of the preset number is discontinuous, the second terminal obtains the electric quantity difference values of the first node and the second node at the sampling time based on a first electric quantity value in the first information and a second electric quantity value which is the same as the sampling time of the first electric quantity value.
4. A method of differential protection of a power distribution network according to any one of claims 1 to 3, wherein the second terminal obtains a difference in power between the first node and the second node at the sampling time based on a first power value in the first information and a second power value that is the same as the sampling time of the first power value, comprising:
Determining whether sampling time in the first information is continuous or not based on the preset time interval;
if the sampling time in the first information is continuous, the second terminal obtains a second electric quantity value acquired by the second terminal at the sampling time based on the sampling time in the first information;
and obtaining the electric quantity difference value of the first node and the second node at the sampling time based on the first electric quantity value and the second electric quantity value at the same sampling time.
5. The method of differential protection of a power distribution network according to claim 4, further comprising, after said determining whether sampling times in said first information are consecutive based on said preset time interval:
if the sampling time in the first information is discontinuous, grouping the first electric quantity values in the first information according to the sequence of the sampling time to obtain a plurality of electric quantity sets, wherein each sampling time corresponding to the first electric quantity value in each electric quantity set is continuous, and the maximum sampling time in each electric quantity set is discontinuous with the minimum sampling time in other electric quantity sets;
arranging the electric quantity sets according to the sequence of the sampling time to obtain ordered electric quantity sets;
Determining a second electric quantity value corresponding to fourth time based on the fourth time, wherein the fourth time is the sampling time of the first electric quantity value in the 1 st electric quantity set;
and obtaining the electric quantity difference value of the first node and the second node at the fourth time based on the first electric quantity value corresponding to the fourth time and the second electric quantity value corresponding to the fourth time.
6. The method for differential protection of a power distribution network according to claim 5, further comprising, after determining the number of first differences:
when the number of the first difference values is smaller than or equal to the preset number and/or sampling time corresponding to the first difference values of the preset number is discontinuous, obtaining second maximum waiting time corresponding to each first electric quantity value missing between the 1 st electric quantity set and the 2 nd electric quantity set based on the maximum sampling time in the 1 st electric quantity set, the preset maximum network delay and the preset differential delay;
if the first electric quantity value corresponding to the missing is not received in each second maximum waiting time, determining a second electric quantity value corresponding to a fifth time based on the fifth time, wherein the fifth time is the sampling time of the first electric quantity value in the 2 nd electric quantity set;
Obtaining an electric quantity difference value of the first node and the second node at the fifth time based on the first electric quantity value corresponding to the fifth time and the second electric quantity value corresponding to the fifth time;
if the first electric quantity value corresponding to the missing is received in the second maximum waiting time, determining a second electric quantity value acquired by the second terminal in the sixth time based on a sixth time, wherein the sixth time is the sampling time of the first electric quantity value received in the second maximum waiting time;
obtaining an electric quantity difference value of the first node and the second node at the sixth time based on the first electric quantity value corresponding to the sixth time and the second electric quantity value corresponding to the sixth time;
determining the number of first difference values, wherein the first difference values are electric quantity difference values larger than a preset difference value in the obtained electric quantity difference values;
when the number of the first difference values is greater than a preset number and sampling time corresponding to the first difference values of the preset number is continuous, the second terminal performs differential protection on the power distribution network line, and the second terminal sends a first instruction to the first terminal, wherein the first instruction is used for indicating the first terminal to perform differential protection on the power distribution network line.
7. The method of differential protection of a power distribution network line of claim 1, wherein when the first electrical quantity value comprises a first voltage value, the method further comprises:
calculating an angle difference of voltage between the first terminal and the second terminal in a preset time period based on a first voltage value in the first information;
determining the number of angle differences larger than a preset value in the angle differences;
and if the number of the angle differences larger than the preset value is larger than the preset number, the second terminal sends alarm information, wherein the alarm information is used for indicating that the first terminal and the second terminal are not synchronous.
8. Terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements a method for differential protection of a distribution network line according to any of claims 1 to 7 when the computer program is executed.
9. A computer-readable storage medium, which stores a computer program, characterized in that the computer program, when executed by a processor, implements a method of differential protection of a distribution network line according to any one of claims 1 to 7.
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