CN115940102A - Protection switching method and device for distribution automation terminal and related equipment - Google Patents
Protection switching method and device for distribution automation terminal and related equipment Download PDFInfo
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Abstract
The application discloses a protection switching method, a device and related equipment for a distribution automation terminal, wherein the method comprises the following steps: detecting whether a 5G communication module of the distribution automation terminal is abnormal or not based on TCP heartbeat; if so, setting the protection mode as short-delay voltage and current protection, wherein the parameters of the short-delay voltage and current protection conform to a preset first fixed value area; detecting whether a 5G communication module of the distribution automation terminal recovers to be normal or not based on TCP heartbeat; if yes, setting the protection mode to be differential protection based on 5G communication and long-delay voltage current mode protection, wherein parameters of the long-delay voltage current mode protection follow a preset second constant value area; and the time parameter in the first constant value area is less than or equal to the time parameter in the second constant value area. The method and the device have the advantages that automatic switching is carried out between two protection types, the situation that the line loses protection due to communication faults can be effectively avoided, various functions of protection rapidity and selectivity are considered, and the power supply reliability of the line is greatly guaranteed.
Description
Technical Field
The present application relates to the field of power distribution automation technologies of power systems, and in particular, to a protection switching method and apparatus for a power distribution automation terminal, and a related device.
Background
With global climate change and sustainable development, in the past, the traditional power supply mode gradually starts to be converted into a novel power system, the traditional fossil energy is gradually exhausted, the power generation of renewable energy sources is rapidly developed, and more power generation stations of various renewable energy sources such as solar energy, wind energy and the like are provided, so that the power supply and power utilization modes become more diversified. Meanwhile, due to uncertainty and instability of new energy power Generation, a large number of Distributed Generation (DG) sources are connected to a power distribution network, so that new challenges are brought to operation and management of a power grid. Therefore, the power distribution network needs to develop a new equipment state monitoring system and adapt to a faster and more efficient communication system, so as to realize operation monitoring and control on the DG in a new environment, and increase the reliability and flexibility of the power distribution network in a new power system and the efficiency of isolating faults and recovering power transmission.
The differential protection principle is that the fault section is automatically judged by utilizing current information at two ends of the section, and due to the characteristic that the fault section is not influenced by a power supply, a load type and line topology, the fault section is automatically judged, so that the fault area is quickly positioned and isolated, and the differential protection principle is the best choice for fault processing of the distribution line. In order to achieve the expected protection effect, the differential protection requires that each side device carries out synchronous sampling, and can quickly transmit the sampling data of the device to the opposite side device, which has high requirements on the time delay and the bandwidth of a communication channel.
Because the distribution network grid structure is complex and is frequently transformed, overhead lines occupy more space, and if optical fiber communication is adopted, the difficulty of multi-end line optical fiber intercommunication is high, and the differential protection is difficult to adapt. The 5G communication technology becomes a hot spot for research and application in various fields due to the advantages of ultra-high bandwidth, ultra-low time delay and ultra-high transmission rate, and differential protection based on 5G communication is also greatly developed and widely applied in the field of automatic protection of power distribution networks. When the power distribution network adopts differential protection and a local fault occurs, the 5G communication system is added, so that millisecond-level automatic positioning and successful fault isolation become possible, uninterrupted power supply of a non-fault area is guaranteed, and power supply reliability and power transmission recovery efficiency of the power distribution network are greatly improved. However, because the coverage of 5G communication is not fully mature, if 5G differential protection is to be adopted to protect the power distribution network, higher requirements are placed on the speed, time delay, reliability, safety and the like of a communication channel. If the communication time delay is too long, the two sides of the differential protection cannot receive the sampling of the opposite side current in time, so that the sampling of the device cannot be synchronous, the differential current is larger than the action setting value of the differential protection device, and the protection malfunction and the outlet tripping operation are probably caused by the misjudgment of the differential protection, and finally the normal line power failure is caused.
The voltage and current type protection type has the biggest advantages that the dependence on communication is small, the manufacturing cost is low, the device is relied on to collect voltage and current information to carry out stable and reliable action protection, but the judgment of a fault interval needs to be judged by means of reclosing of outgoing line switches of a transformer substation and successive switching-on of line switches one by one, the power supply recovery time is too long, the influence on users is large, time matching needs to be considered in the setting of fixed values of all levels of switches, and the task amount of fixed value maintenance is large if line reconstruction or newly added equipment needs to carry out fixed value modification for multiple times.
In the prior art, various strategies of traditional differential protection of a power distribution network and rapid isolation of differential protection based on 5G communication are mainly researched, the stability of 5G signals in a remote area with low coverage rate of the 5G signals or under the fluctuation of base station signals is not considered, and meanwhile, in order to meet the 5G communication, requirements on channels, broadband and transmission speed are more strict, so that how to still realize a protection function of distribution network automation when the 5G communication cannot meet the requirements is a hot point worthy of research.
Disclosure of Invention
In view of this, the present application provides a method, an apparatus and a related device for protection switching of a distribution automation terminal, so as to solve at least one of the above-mentioned technical problems.
In order to achieve the above object, a first aspect of the present application provides a protection switching method for a distribution automation terminal, including:
detecting whether a 5G communication module of the distribution automation terminal is abnormal or not based on TCP heartbeat;
if so, setting a protection mode of the distribution automation terminal as short-delay voltage and current protection, wherein parameters of the short-delay voltage and current protection conform to a preset first constant value area;
detecting whether a 5G communication module of the distribution automation terminal recovers to be normal or not based on TCP heartbeat;
if so, setting the protection mode of the distribution automation terminal as differential protection based on 5G communication and long-delay voltage-current type protection, wherein the parameters of the long-delay voltage-current type protection follow a preset second constant value area;
wherein the time parameter in the first constant value area is less than or equal to the time parameter in the second constant value area.
Preferably, the process of detecting whether an abnormality occurs in a 5G communication module of the distribution automation terminal in real time based on TCP heartbeat includes:
establishing a TCP long connection with a 5G communication module of a distribution automation terminal, sending an empty data packet with an ACK mark to the 5G communication module according to a preset period through the TCP long connection, and receiving a response data packet of the 5G communication module to the empty data packet;
after each time of sending an empty data packet with an ACK mark, acquiring a first time interval from the current moment to the receiving of the latest response data packet, and judging whether the first time interval is not greater than a first preset time delay value or not;
if so, executing zero clearing operation on the first abnormal duration value;
if not, performing a self-increment operation on the first abnormal duration value, and judging whether the updated first abnormal duration value is greater than or equal to a preset first threshold value, if so, determining that the 5G communication module is abnormal.
Preferably, the process of detecting whether an abnormality occurs in the 5G communication module of the distribution automation terminal in real time based on the TCP heartbeat is executed in an independent thread.
Preferably, the process of detecting whether the 5G communication module of the distribution automation terminal recovers to normal in real time based on the TCP heartbeat includes:
establishing a TCP long connection with a 5G communication module of a distribution automation terminal, sending an empty data packet with an ACK mark to the 5G communication module according to a preset period through the TCP long connection, and receiving a response data packet of the 5G communication module to the empty data packet;
after each time of sending an empty data packet with an ACK mark, obtaining a second time interval from the current moment to the receiving of the latest response data packet, and judging whether the second time interval is greater than a second preset time delay value;
if so, executing zero clearing operation on the second abnormal duration value;
if not, performing a self-increment operation on the second abnormal duration value, and judging whether the updated second abnormal duration value is greater than or equal to a preset second threshold value, if so, determining that the 5G communication module is recovered to be normal.
Preferably, the process of detecting whether the 5G communication module of the distribution automation terminal recovers to normal in real time based on the TCP heartbeat is executed in an independent thread.
Preferably, the first certain value region includes:
the constant value of the over-current I section is 10 amperes, the time of the over-current I section is 0 second, the constant value of the over-current II section is 5 amperes, the time of the over-current II section is 0.2 seconds, the constant value of the zero-sequence over-current I section is 1 ampere, and the time of the zero-sequence over-current I section is 0.2 seconds;
the fault detection time limit is 5 seconds, the power-off brake-separating time delay is 3.5 seconds, the interphase fault current fixed value is 5 amperes, the ground fault current fixed value is 1 ampere, the zero-sequence overvoltage fixed value is 60 volts, the zero-sequence overvoltage time delay is 0.2 seconds, and the quick tripping time delay is 0.1 seconds.
Preferably, the second constant value region includes:
the constant value of the overcurrent I section is 10 amperes, the constant value of the overcurrent I section is 0.2 seconds, the constant value of the overcurrent II section is 5 amperes, the constant value of the overcurrent II section is 0.3 seconds, the constant value of the zero-sequence overcurrent I section is 1 ampere, and the constant value of the zero-sequence overcurrent I section is 0.3 seconds;
the fault detection time limit is 5 seconds, the power-off brake-separating time delay is 3.5 seconds, the interphase fault current fixed value is 5 amperes, the ground fault current fixed value is 1 ampere, the zero-sequence overvoltage fixed value is 60 volts, the zero-sequence overvoltage time delay is 0.3 seconds, and the quick tripping time delay is 0.3 seconds.
The second aspect of the present application provides a distribution automation terminal protection auto-change over device, includes:
the first detection unit is used for detecting whether a 5G communication module of the distribution automation terminal is abnormal or not based on TCP heartbeat;
the first switching unit is used for setting a protection mode of the distribution automation terminal as short-delay voltage and current protection when the first detection unit detects that the 5G communication module of the distribution automation terminal is abnormal, wherein parameters of the short-delay voltage and current protection conform to a preset first constant value area;
the second detection unit is used for detecting whether the 5G communication module of the distribution automation terminal is recovered to be normal or not based on TCP heartbeat;
the second switching unit is used for setting the protection mode of the distribution automation terminal to 5G communication-based differential protection and long-delay voltage and current type protection when the second detection unit detects that the 5G communication module of the distribution automation terminal is recovered to be normal, wherein the parameters of the long-delay voltage and current type protection conform to a preset second constant value area;
wherein the time parameter in the first constant value area is less than or equal to the time parameter in the second constant value area.
A third aspect of the present application provides an electronic device comprising: a memory and a processor;
the memory is used for storing programs;
the processor is configured to execute the program, and implement each step of the above-described protection switching method for the distribution automation terminal.
A fourth aspect of the present application provides a storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the distribution automation terminal protection switching method as described above.
According to the technical scheme, on one hand, whether the 5G communication module of the distribution automation terminal is abnormal or not is detected based on the TCP heartbeat. And when the 5G communication module is detected to be abnormal, setting a protection mode of the distribution automation terminal as short-delay voltage and current protection, wherein the parameters of the short-delay voltage and current protection follow a preset first fixed value area. By setting the protection mode to short-delay voltage and current protection, the time constant value of the voltage and current type protection action outlet can be reduced, the action rapidity is improved, and equipment damage caused by faults is prevented. On the other hand, whether the 5G communication module of the distribution automation terminal is recovered to be normal is detected based on the TCP heartbeat. And when the 5G communication module is detected to be recovered to be normal, setting the protection mode of the distribution automation terminal to be differential protection and long-time-delay voltage and current type protection based on 5G communication, wherein the parameters of the long-time-delay voltage and current type protection conform to a preset second constant value area. It is understood that the time parameter in the first constant value area is less than or equal to the time parameter in the second constant value area. By setting the protection mode to be a combined mode of 5G communication-based differential protection and long-delay voltage and current mode protection, the advantages of rapidity and selectivity of 5G communication-based differential protection can be benefited, and meanwhile, the fixed value of the outlet time of the voltage and current mode protection action is increased through the long-delay voltage and current mode protection as a backup so as to ensure the selectivity of the voltage and current mode protection. The method and the device have the advantages that automatic switching is carried out between two protection types, the situation that the line loses protection due to communication faults can be effectively avoided, various functions of protection rapidity and selectivity are considered, and the power supply reliability of the line is greatly guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram of a protection switching method of a distribution automation terminal disclosed in an embodiment of the present application;
fig. 2 is a schematic diagram illustrating detection of whether an abnormality occurs in a 5G communication module of a distribution automation terminal according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram illustrating detecting whether a 5G communication module of a distribution automation terminal recovers to normal according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of a distribution automation terminal protection switching device disclosed in an embodiment of the present application;
fig. 5 is a schematic diagram of a distribution automation terminal protection switching device disclosed in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Some terms are explained below.
Differential protection: the basic principle is to adopt kirchhoff current law to judge whether a protected object has a fault, namely the sum of currents flowing to one node is equal to zero. The protected electric equipment is regarded as a node, when a line has no fault, the current flowing in and the current flowing out of the protected equipment are equal, and the differential current of differential protection is equal to zero; when a line has a fault, the current flowing in and the current flowing out of the protected equipment are unequal, the differential current of the differential protection is larger than zero, and when the differential current is larger than the action setting value of the differential protection, the upper computer alarms and protects the outlet to act, so that the circuit breakers at all sides of the protected equipment are tripped off, and the fault equipment is cut off. Differential current of the power distribution network line differential protection based on 5G communication is vector sum of current sampling values on two sides, and if the current on two sides calculated by taking the differential current has no time delay and the line has no fault or an external fault, the differential current is zero; if the currents on the two sides, which are calculated by taking part in the differential current, have time delay, even if the line has no fault or has an external fault, the differential current is not zero, and when the communication time delay is larger, the differential current is possibly larger than an action setting value, so that the differential protection is mistakenly operated, an outlet is tripped, and the normal line is mistakenly cut.
TCP asynchronous long connection, namely, the system communication connection is maintained all the time after the system communication connection is established, a Client port is connected with a Server port, the Client sends a request (1.. N), the Server processes the request (1.. N), and the Server sends a response (1.. N), wherein the three steps are carried out simultaneously, but are carried out sequentially for each request individual.
Voltage current mode protection: the method is characterized in that communication is not relied on between automatic terminals of a distribution network, when a line has a fault, a transformer substation switch is firstly superposed and is matched with an automatic switch on the line, and the fault section is judged by taking a blocking signal of voltage, a switch position signal and fault current as criteria, so that the functions of power-off delay switching-off, power-on delay switching-on and fault-blocking area switching-on are realized, and the fault section is automatically isolated on the spot.
The protection switching method for the distribution automation terminal provided by the embodiment of the application is described below. Referring to fig. 1, a protection switching method for a distribution automation terminal according to an embodiment of the present disclosure may include the following steps:
and S101, detecting whether the 5G communication module of the distribution automation terminal is abnormal or not based on the TCP heartbeat. If yes, go to step S102.
And step S102, setting the protection mode of the distribution automation terminal as short-delay voltage and current protection.
The parameters of the short-time-delay voltage and current protection follow a preset first fixed value area, and the first fixed value area sets relevant parameters of overcurrent I section fixed value, overcurrent I section time, overcurrent II section fixed value, overcurrent II section time, zero-sequence overcurrent I section fixed value, zero-sequence overcurrent I section time, fault detection time limit, power-loss brake-separating delay, interphase fault current fixed value, grounding fault current fixed value, zero-sequence overvoltage delay and quick trip delay in the voltage and current protection.
And step S103, detecting whether the 5G communication module of the distribution automation terminal is recovered to be normal or not based on the TCP heartbeat. If yes, go to step S104.
And step S104, setting the protection mode of the distribution automation terminal to be differential protection and long-delay voltage and current type protection based on 5G communication.
It can be understood that the detection in step S101 and step S103 are performed independently, and there is no necessary precedence relationship, and actually, step S101 is performed periodically when the protection mode is the differential protection based on 5G communication and the long-delay voltage-current type protection; step S103 is a step periodically executed when the protection mode is set to the short-delay voltage-current protection.
Specifically, the distribution automation terminal may be protected in a mode in which differential protection based on 5G communication is used as a main protection, long-delay voltage current mode protection is used as a backup protection, and the differential protection based on 5G communication and the long-delay voltage current mode protection are mixed.
The parameters of the long-delay voltage-current type protection conform to a preset second constant value area, and the second constant value area sets relevant parameters of overcurrent I section constant value, overcurrent I section time, overcurrent II section constant value, overcurrent II section time, zero-sequence overcurrent I section constant value, zero-sequence overcurrent I section time, fault detection time limit, power loss breaking delay, phase fault current constant value, ground fault current constant value, zero-sequence overvoltage delay and quick tripping delay in the voltage-current protection. It is understood that the time parameter in the first constant value region is less than or equal to the time parameter in the second constant value region, thereby distinguishing between "short delay" and "long delay".
In the present application, on the one hand, whether an abnormality occurs in a 5G communication module of a distribution automation terminal is detected based on a TCP heartbeat. And when the 5G communication module is detected to be abnormal, setting a protection mode of the distribution automation terminal as short-delay voltage and current protection, wherein parameters of the short-delay voltage and current protection follow a preset first constant value area. By setting the protection mode to short-delay voltage and current protection, the time constant value of the voltage and current type protection action outlet can be reduced, the action rapidity is improved, and equipment damage caused by faults is prevented. On the other hand, whether the 5G communication module of the distribution automation terminal is recovered to be normal is detected based on the TCP heartbeat. And when the 5G communication module is detected to be recovered to be normal, setting the protection mode of the distribution automation terminal to be differential protection and long-time-delay voltage and current type protection based on 5G communication, wherein the parameters of the long-time-delay voltage and current type protection conform to a preset second constant value area. It is understood that the time parameter in the first fixed value area is less than or equal to the time parameter in the second fixed value area. By setting the protection mode to be a combined mode of 5G communication-based differential protection and long-delay voltage and current mode protection, the advantages of rapidity and selectivity of 5G communication-based differential protection can be benefited, and meanwhile, the fixed value of the outlet time of the voltage and current mode protection action is increased through the long-delay voltage and current mode protection as a backup so as to ensure the selectivity of the voltage and current mode protection. The method and the device have the advantages that automatic switching is carried out between two protection types, the situation that the line loses protection due to communication faults can be effectively avoided, various functions of protection rapidity and selectivity are considered, and the power supply reliability of the line is greatly guaranteed.
Table 1: short delay voltage current type protection fixed value meter
| Constant value of voltage current type | Constant value |
| Constant value zone | 1 |
| Constant value of overcurrent I section | 10A |
| Over-current I period | 0S |
| Constant value of over-current II section | 5A |
| Over-current II period | 0.2S |
| Zero sequence overcurrent I-section constant value | 1A |
| Zero sequence overcurrent I period | 0.2S |
| Time limit for fault detection | 5S |
| Power-off brake-off delay | 3.5S |
| Constant value of phase-to-phase fault current | 5A |
| Fixed value of earth fault current | 1A |
| Zero sequence overvoltage constant value | 60V |
| Zero sequence overvoltage time delay | 0.2S |
| Fast trip delay | 0.1S |
In some embodiments of the present application, as shown in table 1, the first certain value region includes:
the constant value of the over-current I section is 10 amperes, the time of the over-current I section is 0 second, the constant value of the over-current II section is 5 amperes, the time of the over-current II section is 0.2 seconds, the constant value of the zero-sequence over-current I section is 1 ampere, and the time of the zero-sequence over-current I section is 0.2 seconds;
the fault detection time limit is 5 seconds, the power-off brake-separating time delay is 3.5 seconds, the interphase fault current fixed value is 5 amperes, the ground fault current fixed value is 1 ampere, the zero-sequence overvoltage fixed value is 60 volts, the zero-sequence overvoltage time delay is 0.2 seconds, and the quick tripping time delay is 0.1 second.
In some embodiments of the present application, as shown in table 1, the second fixed value region includes:
the constant value of the overcurrent I section is 10 amperes, the constant value of the overcurrent I section is 0.2 seconds, the constant value of the overcurrent II section is 5 amperes, the constant value of the overcurrent II section is 0.3 seconds, the constant value of the zero-sequence overcurrent I section is 1 ampere, and the constant value of the zero-sequence overcurrent I section is 0.3 seconds;
the fault detection time limit is 5 seconds, the power-off brake-separating time delay is 3.5 seconds, the interphase fault current fixed value is 5 amperes, the ground fault current fixed value is 1 ampere, the zero-sequence overvoltage fixed value is 60 volts, the zero-sequence overvoltage time delay is 0.3 seconds, and the quick tripping time delay is 0.3 seconds.
Table 2:5G differential protection + long-delay voltage current type protection constant value meter
| Constant value of voltage current type | Constant value |
| Constant value zone | 2 |
| Constant value of overcurrent I section | 10A |
| Over-current I period | 0.2S |
| Constant value of over-current II section | 5A |
| Over-current II period | 0.3S |
| Zero sequence overcurrent I-section constant value | 1A |
| Zero sequence overcurrent I period | 0.3S |
| Time limit for fault detection | 5S |
| Power-off brake-off delay | 3.5S |
| Constant value of fault current between phases | 5A |
| Earth fault current set value | 1A |
| Zero sequence overvoltage constant value | 60V |
| Zero sequence overvoltage time delay | 0.3S |
| Fast trip delay | 0.3S |
In some embodiments of the present application, the step S101 is a process of detecting whether an abnormality occurs in a 5G communication module of a distribution automation terminal in real time based on a TCP heartbeat, and the process may include:
s1, TCP long connection is established with a 5G communication module of a distribution automation terminal, an empty data packet with an ACK mark is sent to the 5G communication module through the TCP long connection according to a preset period, and a response data packet of the 5G communication module to the empty data packet is received.
And S2, after each time of sending an empty data packet with an ACK mark, acquiring a first time interval from the current moment to the receiving of the latest response data packet, and judging whether the first time interval is not greater than a first preset time delay value. If yes, executing S3; if not, executing S4.
And S3, performing zero clearing operation on the first abnormal duration value.
No matter what the first abnormal duration value is, the first abnormal duration value becomes 0 after the step.
And S4, performing a self-increment operation on the first abnormal duration value, and judging whether the updated first abnormal duration value is greater than or equal to a preset first threshold value. If yes, determining that the 5G communication module is abnormal.
Referring to fig. 2, the process of determining whether an abnormality occurs may include:
firstly, a Server establishes long connection with a Client, and i is set to 0;
secondly, the Server sends an empty data packet with an ACK mark to the Client, and sets a time interval T for sending the data packet at regular time;
thirdly, every T time, the Server calculates the time when the ACK data packet replied by the Client is not received, wherein the time can be calculated as follows:
t = current time-time of last received heartbeat
Step four, judging whether t is larger than a set Delay value Delay, and entering the next step if t is larger than the set Delay value Delay; if t is not greater than the set Delay value Delay, setting i to 0, and entering the second step;
fifthly, adding 1 to the i (i =1,2, \8230;, N), wherein N is the preset frequency that the Client can not receive the heartbeat packet for continuous N times, and then judging the number of times of disconnection of the Client;
sixthly, judging whether i is larger than or equal to N, and entering the second step if i is smaller than N; if i is larger than or equal to N, entering the next step;
seventhly, determining that the Client is disconnected and the communication connection is disconnected;
and eighthly, ending.
In some embodiments of the present application, the process of detecting in real time whether an abnormality occurs in the 5G communication module of the distribution automation terminal in step S101 based on the TCP heartbeat is executed in an independent thread.
In some embodiments of the present application, the step S103 of detecting in real time whether the 5G communication module of the distribution automation terminal recovers to normal based on TCP heartbeat may include:
s1, establishing a TCP long connection with a 5G communication module of a distribution automation terminal, sending an empty data packet with an ACK mark to the 5G communication module according to a preset period through the TCP long connection, and receiving a response data packet of the 5G communication module to the empty data packet.
And S2, after each time of sending an empty data packet with an ACK mark, acquiring a second time interval from the current moment to the receiving of the latest response data packet, and judging whether the second time interval is greater than a second preset time delay value. If yes, executing S3; if not, executing S4.
And S3, performing zero clearing operation on the second abnormal duration value.
The first abnormal duration value becomes 0 after the present step, no matter what the first abnormal duration value was.
And S4, performing a self-increment operation on the second abnormal duration value, and judging whether the updated second abnormal duration value is greater than or equal to a preset second threshold value, if so, determining that the 5G communication module is recovered to be normal.
Referring to fig. 3, the process of determining whether to recover to normal may include:
firstly, a Server tries to establish long connection with a Client, and j is set to be 0;
secondly, the Server sends an empty data packet with an ACK mark to the Client, and sets a time interval T for sending the data packet at regular time;
thirdly, every T time, the Server calculates the time when the ACK data packet replied by the Client is not received, wherein the time can be calculated as follows:
t = current time-time of last received heartbeat
Step four, judging whether t is larger than a set Delay value Delay, if t is larger than the set Delay value Delay, setting j to 0, and entering the step two; if t is not larger than the set Delay value Delay, entering the next step;
fifthly, j is added by 1 (j =1,2, \8230;, N), wherein N is the set number of times of continuously receiving heartbeat packets for N times, and the number of times of the Client on line is judged;
sixthly, judging whether j is larger than or equal to N, and if j is smaller than N, entering the second step; if j is larger than or equal to N, entering the next step;
seventhly, determining that the Client is on line, the Server and the Client establish long connection, and the communication connection is recovered to be normal;
and eighthly, ending.
In some embodiments of the present application, the step S103 is performed in an independent thread based on a process of detecting whether the 5G communication module of the distribution automation terminal recovers to normal in real time based on the TCP heartbeat.
The following describes the distribution automation terminal protection switching device provided in the embodiment of the present application, and the distribution automation terminal protection switching device described below and the distribution automation terminal protection switching method described above may be referred to in correspondence with each other.
Referring to fig. 4, the distribution automation terminal protection switching device provided in the embodiment of the present application may include:
the first detection unit 21 is configured to detect whether a 5G communication module of the distribution automation terminal is abnormal based on a TCP heartbeat;
the first switching unit 22 is configured to set a protection mode of the distribution automation terminal to short-delay voltage and current protection when the first detection unit detects that the 5G communication module of the distribution automation terminal is abnormal, where a parameter of the short-delay voltage and current protection follows a preset first fixed value region;
the second detection unit 23 is configured to detect whether the 5G communication module of the distribution automation terminal recovers to normal based on the TCP heartbeat;
the second switching unit 24 is configured to set, when the second detection unit detects that the 5G communication module of the distribution automation terminal is recovered to normal, a protection mode of the distribution automation terminal to 5G communication-based differential protection and long-delay voltage-current protection, where a parameter of the long-delay voltage-current protection follows a preset second constant value region;
wherein the time parameter in the first constant value area is less than or equal to the time parameter in the second constant value area.
In some embodiments of the present application, the process of detecting, by the first detecting unit 21, whether an abnormality occurs in the 5G communication module of the distribution automation terminal in real time based on the TCP heartbeat may include:
establishing a TCP long connection with a 5G communication module of a distribution automation terminal, sending an empty data packet with an ACK mark to the 5G communication module according to a preset period through the TCP long connection, and receiving a response data packet of the 5G communication module to the empty data packet;
after each time of sending an empty data packet with an ACK mark, acquiring a first time interval from the current moment to the receiving of the latest response data packet, and judging whether the first time interval is not greater than a first preset time delay value or not;
if so, executing zero clearing operation on the first abnormal duration value;
if not, performing a self-increment operation on the first abnormal duration value, and judging whether the updated first abnormal duration value is greater than or equal to a preset first threshold value, if so, determining that the 5G communication module is abnormal.
In some embodiments of the present application, the process of detecting whether an abnormality occurs in the 5G communication module of the distribution automation terminal in real time by the first detecting unit 21 based on the TCP heartbeat is executed in an independent thread.
In some embodiments of the present application, the process of detecting, in real time, whether the 5G communication module of the distribution automation terminal recovers to normal by the second detecting unit 23 based on the TCP heartbeat may include:
establishing a TCP long connection with a 5G communication module of a distribution automation terminal, sending an empty data packet with an ACK mark to the 5G communication module according to a preset period through the TCP long connection, and receiving a response data packet of the 5G communication module to the empty data packet;
after each time of sending an empty data packet with an ACK mark, acquiring a second time interval from the current moment to the receiving of the latest response data packet, and judging whether the second time interval is greater than a second preset time delay value or not;
if so, executing zero clearing operation on the second abnormal duration value;
if not, performing a self-increment operation on the second abnormal duration value, and judging whether the updated second abnormal duration value is greater than or equal to a preset second threshold value, if so, determining that the 5G communication module is recovered to be normal.
In some embodiments of the present application, the second detecting unit 23 detects in real time whether the 5G communication module of the distribution automation terminal recovers to a normal state based on the TCP heartbeat, and executes the process in a separate thread.
In some embodiments of the present application, the first location area comprises:
the constant value of the over-current I section is 10 amperes, the time of the over-current I section is 0 second, the constant value of the over-current II section is 5 amperes, the time of the over-current II section is 0.2 seconds, the constant value of the zero-sequence over-current I section is 1 ampere, and the time of the zero-sequence over-current I section is 0.2 seconds;
the fault detection time limit is 5 seconds, the power-off brake-separating time delay is 3.5 seconds, the interphase fault current fixed value is 5 amperes, the ground fault current fixed value is 1 ampere, the zero-sequence overvoltage fixed value is 60 volts, the zero-sequence overvoltage time delay is 0.2 seconds, and the quick tripping time delay is 0.1 seconds.
In some embodiments of the present application, the second fixed value region includes:
the constant value of the overcurrent I section is 10 amperes, the constant value of the overcurrent I section is 0.2 seconds, the constant value of the overcurrent II section is 5 amperes, the constant value of the overcurrent II section is 0.3 seconds, the constant value of the zero-sequence overcurrent I section is 1 ampere, and the constant value of the zero-sequence overcurrent I section is 0.3 seconds;
the fault detection time limit is 5 seconds, the power-off brake-separating time delay is 3.5 seconds, the interphase fault current fixed value is 5 amperes, the ground fault current fixed value is 1 ampere, the zero-sequence overvoltage fixed value is 60 volts, the zero-sequence overvoltage time delay is 0.3 seconds, and the quick tripping time delay is 0.3 seconds.
The distribution automation terminal protection switching device provided by the embodiment of the application can be applied to distribution automation terminal protection switching equipment such as a computer. Optionally, fig. 5 shows a block diagram of a hardware structure of the distribution automation terminal protection switching device, and referring to fig. 5, the hardware structure of the distribution automation terminal protection switching device may include: at least one processor 31, at least one communication interface 32, at least one memory 33 and at least one communication bus 34.
In the embodiment of the present application, the number of the processor 31, the communication interface 32, the memory 33 and the communication bus 34 is at least one, and the processor 31, the communication interface 32 and the memory 33 complete communication with each other through the communication bus 34;
the processor 31 may be a central processing unit CPU, or an Application Specific Integrated Circuit ASIC (Application Specific Integrated Circuit), or one or more Integrated circuits configured to implement the embodiments of the present Application, etc.;
the memory 33 may include a high-speed RAM memory, and may further include a non-volatile memory (non-volatile memory) or the like, such as at least one disk memory;
wherein the memory 33 stores a program and the processor 31 may call the program stored in the memory 33 for:
detecting whether a 5G communication module of the distribution automation terminal is abnormal or not based on TCP heartbeat;
if so, setting a protection mode of the distribution automation terminal as short-delay voltage and current protection, wherein parameters of the short-delay voltage and current protection conform to a preset first constant value area;
detecting whether a 5G communication module of the distribution automation terminal recovers to be normal or not based on TCP heartbeat;
if so, setting the protection mode of the distribution automation terminal as differential protection based on 5G communication and long-delay voltage-current type protection, wherein the parameters of the long-delay voltage-current type protection follow a preset second constant value area;
wherein the time parameter in the first constant value area is less than or equal to the time parameter in the second constant value area.
Alternatively, the detailed function and the extended function of the program may refer to the above description.
An embodiment of the present application further provides a storage medium, where the storage medium may store a program adapted to be executed by a processor, where the program is configured to:
detecting whether a 5G communication module of the distribution automation terminal is abnormal or not based on TCP heartbeat;
if so, setting a protection mode of the distribution automation terminal as short-delay voltage and current protection, wherein parameters of the short-delay voltage and current protection conform to a preset first constant value area;
detecting whether a 5G communication module of the distribution automation terminal recovers to be normal or not based on TCP heartbeat;
if so, setting the protection mode of the distribution automation terminal as differential protection based on 5G communication and long-delay voltage-current type protection, wherein the parameters of the long-delay voltage-current type protection follow a preset second constant value area;
wherein the time parameter in the first constant value area is less than or equal to the time parameter in the second constant value area.
Alternatively, the detailed function and the extended function of the program may be as described above.
In summary, the following steps:
in the present application, on the one hand, whether an abnormality occurs in a 5G communication module of a distribution automation terminal is detected based on a TCP heartbeat. And when the 5G communication module is detected to be abnormal, setting a protection mode of the distribution automation terminal as short-delay voltage and current protection, wherein the parameters of the short-delay voltage and current protection follow a preset first fixed value area. By setting the protection mode to short-delay voltage and current protection, the constant time value of the voltage and current type protection action outlet can be reduced, the action rapidity is improved, and equipment damage caused by faults is prevented. On the other hand, whether the 5G communication module of the distribution automation terminal returns to normal is detected based on the TCP heartbeat. And when the 5G communication module is detected to be recovered to be normal, setting the protection mode of the distribution automation terminal to be differential protection and long-time-delay voltage and current type protection based on 5G communication, wherein the parameters of the long-time-delay voltage and current type protection conform to a preset second constant value area. It is understood that the time parameter in the first fixed value area is less than or equal to the time parameter in the second fixed value area. By setting the protection mode to be a combined mode of 5G communication-based differential protection and long-delay voltage and current mode protection, the advantages of rapidity and selectivity of 5G communication-based differential protection can be benefited, and meanwhile, the fixed value of the outlet time of the voltage and current mode protection action is increased through the long-delay voltage and current mode protection as a backup so as to ensure the selectivity of the voltage and current mode protection. The method and the device have the advantages that automatic switching is carried out between two protection types, the situation that the line loses protection due to communication faults can be effectively avoided, various functions of protection rapidity and selectivity are considered, and the power supply reliability of the line is greatly guaranteed.
Finally, it should also be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, the embodiments may be combined as needed, and the same and similar parts may be referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A protection switching method for a distribution automation terminal is characterized by comprising the following steps:
detecting whether a 5G communication module of the distribution automation terminal is abnormal or not based on TCP heartbeat;
if so, setting a protection mode of the distribution automation terminal as short-delay voltage and current protection, wherein parameters of the short-delay voltage and current protection conform to a preset first constant value area;
detecting whether a 5G communication module of the distribution automation terminal recovers to be normal or not based on TCP heartbeat;
if yes, setting a protection mode of the distribution automation terminal to be differential protection based on 5G communication and long-delay voltage-current type protection, wherein parameters of the long-delay voltage-current type protection follow a preset second constant value area;
wherein the time parameter in the first constant value area is less than or equal to the time parameter in the second constant value area.
2. The method of claim 1, wherein the process of detecting whether the 5G communication module of the distribution automation terminal is abnormal in real time based on TCP heartbeat comprises:
establishing a TCP long connection with a 5G communication module of a distribution automation terminal, sending an empty data packet with an ACK mark to the 5G communication module according to a preset period through the TCP long connection, and receiving a response data packet of the 5G communication module to the empty data packet;
after each time of sending an empty data packet with an ACK mark, acquiring a first time interval from the current moment to the receiving of the latest response data packet, and judging whether the first time interval is not greater than a first preset time delay value or not;
if yes, performing zero clearing operation on the first abnormal duration value;
if not, performing a self-increment operation on the first abnormal duration value, and judging whether the updated first abnormal duration value is greater than or equal to a preset first threshold value, if so, determining that the 5G communication module is abnormal.
3. The method according to claim 2, wherein the process of detecting whether the 5G communication module of the distribution automation terminal is abnormal in real time based on the TCP heartbeat is executed in a separate thread.
4. The method of claim 1, wherein the process of detecting whether the 5G communication module of the distribution automation terminal is normal in real time based on TCP heartbeat comprises:
establishing a TCP long connection with a 5G communication module of a distribution automation terminal, sending an empty data packet with an ACK mark to the 5G communication module according to a preset period through the TCP long connection, and receiving a response data packet of the 5G communication module to the empty data packet;
after each time of sending an empty data packet with an ACK mark, acquiring a second time interval from the current moment to the receiving of the latest response data packet, and judging whether the second time interval is greater than a second preset time delay value or not;
if yes, performing zero clearing operation on the second abnormal duration value;
if not, performing a self-increment operation on the second abnormal duration value, and judging whether the updated second abnormal duration value is greater than or equal to a preset second threshold value, if so, determining that the 5G communication module is recovered to be normal.
5. The method according to claim 4, wherein the process of detecting whether the 5G communication module of the distribution automation terminal is normal or not in real time based on TCP heartbeat is executed in a separate thread.
6. The method of claim 1, wherein the first constant value region comprises:
the constant value of the over-current I section is 10 amperes, the time of the over-current I section is 0 second, the constant value of the over-current II section is 5 amperes, the time of the over-current II section is 0.2 seconds, the constant value of the zero-sequence over-current I section is 1 ampere, and the time of the zero-sequence over-current I section is 0.2 seconds;
the fault detection time limit is 5 seconds, the power-off brake-separating time delay is 3.5 seconds, the interphase fault current fixed value is 5 amperes, the ground fault current fixed value is 1 ampere, the zero-sequence overvoltage fixed value is 60 volts, the zero-sequence overvoltage time delay is 0.2 seconds, and the quick tripping time delay is 0.1 second.
7. The method of claim 1, wherein the second constant value region comprises:
the constant value of the overcurrent I section is 10 amperes, the constant value of the overcurrent I section is 0.2 seconds, the constant value of the overcurrent II section is 5 amperes, the constant value of the overcurrent II section is 0.3 seconds, the constant value of the zero-sequence overcurrent I section is 1 ampere, and the constant value of the zero-sequence overcurrent I section is 0.3 seconds;
the fault detection time limit is 5 seconds, the power-off brake-separating time delay is 3.5 seconds, the interphase fault current fixed value is 5 amperes, the ground fault current fixed value is 1 ampere, the zero-sequence overvoltage fixed value is 60 volts, the zero-sequence overvoltage time delay is 0.3 seconds, and the quick tripping time delay is 0.3 seconds.
8. A distribution automation terminal protection switching device, comprising:
the first detection unit is used for detecting whether the 5G communication module of the distribution automation terminal is abnormal or not based on TCP heartbeat;
the first switching unit is used for setting a protection mode of the distribution automation terminal as short-delay voltage and current protection when the first detection unit detects that the 5G communication module of the distribution automation terminal is abnormal, wherein parameters of the short-delay voltage and current protection conform to a preset first constant value area;
the second detection unit is used for detecting whether the 5G communication module of the distribution automation terminal is recovered to be normal or not based on TCP heartbeat;
the second switching unit is used for setting the protection mode of the distribution automation terminal to 5G communication-based differential protection and long-delay voltage and current type protection when the second detection unit detects that the 5G communication module of the distribution automation terminal is recovered to be normal, wherein the parameters of the long-delay voltage and current type protection conform to a preset second constant value area;
wherein the time parameter in the first constant value area is less than or equal to the time parameter in the second constant value area.
9. An electronic device, comprising: a memory and a processor;
the memory is used for storing programs;
the processor is configured to execute the program to implement the steps of the distribution automation terminal protection switching method according to any one of claims 1 to 7.
10. A storage medium having stored thereon a computer program, characterized in that the computer program, when being executed by a processor, realizes the steps of the distribution automation terminal protection switching method according to any one of claims 1 to 7.
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| CN202211650653.5A CN115940102A (en) | 2022-12-21 | 2022-12-21 | Protection switching method and device for distribution automation terminal and related equipment |
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| CN202211650653.5A CN115940102A (en) | 2022-12-21 | 2022-12-21 | Protection switching method and device for distribution automation terminal and related equipment |
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