CN114552543A - Differential protection method and system for power distribution network and power distribution terminal - Google Patents
Differential protection method and system for power distribution network and power distribution terminal Download PDFInfo
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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Abstract
The invention discloses a differential protection method, a system and a power distribution terminal of a power distribution network in the technical field of the power distribution network, wherein the method is executed by the power distribution terminal and comprises the following steps: acquiring reference time forwarded by client terminal equipment; data exchange is carried out between the client terminal equipment and the adjacent power distribution terminal through a 5G deterministic network so as to collect information required by complete differential protection calculation; generating a data message by combining the reference time and the acquired information required by differential protection calculation; transmitting the data message to a power distribution management system through a 5G deterministic network so that the power distribution management system can execute differential protection calculation according to the data message; the adjacent power distribution terminal refers to a power distribution terminal which is positioned on the same distribution line with the input end or the output end of the current power distribution terminal, and the information required by differential protection calculation at least comprises a current sampling value flowing into and flowing out of the power distribution terminal and time scale information of the current sampling value. The invention can improve the reliability of differential protection.
Description
Technical Field
The invention relates to the technical field of power distribution networks, in particular to a power distribution network differential protection method, a power distribution network differential protection system and a power distribution terminal.
Background
The differential protection of the power distribution network utilizes kirchhoff current theorem to measure the inflow current and the outflow current of the protected power distribution terminal under a time synchronization mechanism, and if the inflow current and the outflow current are equal, the differential current is zero. When the power distribution terminal breaks down, the current flowing into the power distribution terminal is not equal to the current flowing out of the power distribution terminal any more, and if the differential current is greater than zero, the differential protection action is triggered to trip the circuit breakers on all sides of the power distribution terminal, so that the power supply of the fault equipment is disconnected.
The traditional differential protection system adopts optical fibers as a communication channel, and cannot ensure the synchronization of data of inflow and outflow ports of a power distribution terminal in the face of huge data volume interaction, so that the differential protection control is unreliable, and the safe and reliable operation of a power distribution network cannot be ensured.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a power distribution network differential protection method, a power distribution network differential protection system and a power distribution terminal, wherein a 5G deterministic network is used for data transmission, and the reliability of differential protection is improved.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
in one aspect, the present invention provides a differential protection method for a power distribution network, which is executed by a power distribution terminal, and includes:
acquiring reference time forwarded by client terminal equipment;
data exchange is carried out between the client terminal equipment and the adjacent power distribution terminal through a 5G deterministic network so as to collect information required by complete differential protection calculation;
combining the reference time and the acquired information required by differential protection calculation to generate a data message;
transmitting the data message to a power distribution management system through a 5G deterministic network so that the power distribution management system can perform differential protection calculations according to the data message; the adjacent power distribution terminal refers to a power distribution terminal which is positioned on the same power distribution line with the input end or the output end of the current power distribution terminal; the information required for the differential protection calculation at least comprises current sampling values flowing into and out of the power distribution terminal and time scale information of the current sampling values.
Further, the information required by the differential protection calculation also comprises the switch state for the differential protection control of the power distribution terminal.
Further, the method further comprises:
and calculating the time delay of the information required by the next acquisition differential protection calculation according to the time scale information of the current sampling value and the reference time.
Further, the method for calculating the time delay of the information required by the next acquisition differential protection calculation comprises the following steps:
calculating the average time deviation amount of the time scale information of the current sampling value of each power distribution terminal relative to the current sampling reference time;
and performing summation operation on the average time deviation value and the next sampling reference time to acquire the time delay of the information required by the next acquisition differential protection calculation.
Further, the format of the data packet is as follows:
| header part | DTU_m | DTU_n | DTU_k | Time_0 | CRC |
The DTU _ m, DTU _ n and DTU _ k are all required information for differential protection calculation acquired from adjacent power distribution terminals through data exchange, and the Time _0 is reference Time; the CRC is a check bit.
In another aspect, the present invention provides a power distribution terminal comprising:
a time acquisition module: the method comprises the steps of obtaining a reference time forwarded by client terminal equipment;
an acquisition module: the system comprises a data acquisition module, a data acquisition module and a data processing module, wherein the data acquisition module is used for acquiring information required by complete differential protection calculation through a 5G deterministic network by a client terminal device and an adjacent power distribution terminal;
a message generation module: the data message is generated by combining the reference time and the information required by the differential protection calculation;
a transmission module: the data message is transmitted to a power distribution management system through a 5G deterministic network so that the power distribution management system can execute differential protection calculation according to the data message;
the adjacent power distribution terminal refers to a power distribution terminal which is positioned on the same distribution line with the input end or the output end of the current power distribution terminal; the information required for the differential protection calculation at least comprises current sampling values flowing into and out of the power distribution terminal and time scale information of the current sampling values.
Further, the power distribution terminal further includes:
a calculation module: and the time delay is used for calculating the time delay of the information required by the next acquisition differential protection calculation according to the time scale information of the current sampling value and the reference time.
Further, the calculation module comprises:
a first calculation submodule: the time scale information of the current sampling value of each power distribution terminal is calculated according to the average time deviation value of the current sampling reference time;
a second calculation submodule: and the time delay is used for carrying out summation operation on the average time deviation value and the next sampling reference time to acquire the information required by the next acquisition differential protection calculation.
In another aspect, the present invention further provides a differential protection system for a power distribution network, including:
a client terminal device: the system is used for forwarding the reference time to the power distribution terminal and realizing data exchange between the current power distribution terminal and the adjacent power distribution terminal through a 5G deterministic network;
a power distribution terminal: the data exchange module is used for acquiring information required by complete differential protection calculation through data exchange and generating a data message by combining the reference time and the acquired information required by the differential protection calculation;
the power distribution management system comprises: the system comprises a 5G deterministic network, a data message and a differential protection calculation module, wherein the data message is used for receiving a data message generated by a power distribution terminal through the 5G deterministic network and executing the differential protection calculation according to the data message;
the adjacent power distribution terminal refers to a power distribution terminal which is positioned on the same distribution line with the input end or the output end of the current power distribution terminal; the information required for the differential protection calculation at least comprises current sampling values flowing into and out of the power distribution terminal and time scale information of the current sampling values.
Further, the power distribution network differential protection system further comprises:
the time synchronization server: for periodically transmitting a broadcast frame written with a reference time through a 5G deterministic network;
the client terminal device: the system is also used for acquiring the broadcast frame through a 5G deterministic network and extracting a reference time from the broadcast frame;
the power distribution terminal: and the time delay unit is also used for calculating the time delay of the information required by the next acquisition differential protection calculation according to the time scale information of the current sampling value and the reference time.
Compared with the prior art, the invention has the following beneficial effects:
the client terminal equipment exchanges data with the adjacent power distribution terminal through a low-delay and high-reliability 5G deterministic network to realize the acquisition of information required by complete differential protection calculation, and can ensure the time synchronization of the acquired information so as to improve the reliability of differential protection action;
the time delay of the information required by the next acquisition of differential protection calculation is calculated according to the reference time and the time scale information of the currently acquired data, the deviation amount of the information acquisition time of each power distribution terminal relative to the reference time is considered, the next sampling time of each power distribution terminal is accurately aligned, the time synchronism of the information acquired by each power distribution terminal is further improved, the differential protection control is more accurate and reliable, and the safe and reliable operation of a power distribution network is facilitated to be guaranteed.
Drawings
Fig. 1 is a schematic block diagram of a structure of a differential protection system of a power distribution network according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention are described in detail below with reference to the drawings and specific embodiments, and it should be understood that the specific features in the embodiments and examples of the present invention are described in detail in the technical solutions of the present application, and are not limited to the technical solutions of the present application, and the technical features in the embodiments and examples of the present application may be combined with each other without conflict.
The first embodiment is as follows:
the embodiment of the invention provides a differential protection method for a power distribution network, which can be executed by power distribution terminals (abbreviated as DTU in the figure) in a differential protection system of the power distribution network shown in fig. 1, wherein each power distribution terminal is provided with customer terminal equipment (abbreviated as CPE in the figure) connected with the power distribution terminal, and each power distribution terminal is accessed to a 5G deterministic network through respective customer terminal equipment. The method specifically comprises the following steps:
the method comprises the following steps: acquiring reference time forwarded by client terminal equipment, and performing data exchange with an adjacent power distribution terminal through the client terminal equipment through a 5G deterministic network to acquire information required by complete differential protection calculation;
step two: combining the reference time and the acquired information required by differential protection calculation to generate a data message;
step three: transmitting the data message to a power distribution management system through a 5G deterministic network so that the power distribution management system can perform differential protection calculations according to the data message;
the information required by the differential protection calculation at least comprises current sampling values flowing into and out of the power distribution terminal and time scale information of the current sampling values. It should be noted that: there may be a plurality of such distribution terminals, only three of which are shown in fig. 1 for purposes of illustration. In fig. 1, the input ends or the output ends of the three power distribution terminals are located on the same distribution line, and the power distribution terminals are adjacent to each other. The current distribution terminal can realize differential protection control by collecting the current flowing into and out of the current distribution terminal of the adjacent distribution terminal. The power distribution management system is a part of a power distribution main station, and differential protection calculation and differential protection instruction generation can be realized through an existing computer program.
The differential protection of the power distribution network is to measure the inflow current and the outflow current of a protected power distribution terminal under a time synchronization mechanism by utilizing the kirchhoff current theorem: if equal, the differential current is zero; if not, differential protection control needs to be executed. Therefore, the information required for the differential protection calculation according to the embodiment of the present invention at least includes current sampling values flowing into and flowing out of the power distribution terminal, and may further include a switch state for the differential protection control of the power distribution terminal.
The embodiment of the invention adopts a 5G deterministic network to replace the traditional optical fiber channel, and can construct a transverse network at two ends or more ends of a distribution network and a longitudinal network from a distribution terminal to a distribution main station. The 5G deterministic network has the advantages of low delay, high reliability and the like, can realize deterministic network communication, particularly in a uRLLC scene, can realize the aim of 0.5ms of uplink and downlink delay, has the reliability of transmitting 32 byte packets within 1ms of user plane delay of 99.999 percent, is applied to data communication of power distribution network differential protection, and can realize real-time processing and fault isolation of power distribution network differential protection control.
Example two:
the embodiment of the invention provides a differential protection method for a power distribution network, which is different from the first embodiment in that a power distribution terminal also needs to calculate time delay of information required by next acquisition of differential protection calculation so as to realize accurate alignment of sampling moments of each power distribution terminal, and the method specifically comprises the following steps:
and extracting time mark information of the current sampling value, and calculating time delay of information required by next acquisition differential protection calculation according to the time mark information and the reference time.
The reference time can be generated by a time synchronization server accessed to the 5G deterministic network, and the client terminal equipment can acquire the reference time through the 5G deterministic network and forward the reference time to the power distribution terminal.
The method for calculating the time delay of the information required by the next acquisition differential protection calculation according to the time scale information and the reference time comprises the following steps:
step a: calculating the average time deviation amount of the time scale information of the current sampling value of each power distribution terminal relative to the current sampling reference time;
taking 3 power distribution terminals shown in fig. 1 as an example, assume that the reference time issued by the time synchronization server is T0 (i)Distribution terminal DTUm、DTUn、DTUkThe time scale information of the current sampling value collected this time is T respectivelym (i)、Tn (i)、Tk (i)Average time deviation amount
Step b: and summing the average time deviation value and the next sampling reference time to obtain the time delay of the information required by the next acquisition differential protection calculation, wherein the calculation formula can be represented as follows: Δ ═ T0 (i+1)+Δi+1Wherein, delta is the time delay of the information required by the next acquisition differential protection calculation;
the reference time for the next sample received by the power distribution terminal.
It should be noted that: the 5G deterministic network is used for creating slices according to a power distribution network differential protection slice template and starting data message transmission; if the delay (i.e., Δ) exceeds 10ms, indicating that the existing slice function is aging, the slice needs to be updated according to the differential control delay requirement.
As an embodiment of the present invention, the format of the data packet may be written as follows:
| header part | DTU_m | DTU_n | DTU_k | Time_0 | CRC |
The DTU _ m, DTU _ n and DTU _ k are all required information for differential protection calculation acquired from adjacent power distribution terminals through data exchange, and the Time _0 is reference Time; the CRC is a check bit.
According to the power distribution network differential protection method provided by the embodiment of the invention, the time delay of information required by next acquisition of differential protection calculation is calculated according to the reference time and the time scale information of the currently acquired data, and the deviation of the information acquisition time of each power distribution terminal relative to the reference time is considered, so that the next sampling time of each power distribution terminal is accurately aligned, the time synchronism of the information acquired by each power distribution terminal is further improved, the differential protection control is more accurate and reliable, and the safe and reliable operation of a power distribution network is facilitated to be ensured.
Example three:
the embodiment of the invention provides a power distribution terminal which can be used for realizing the method in the first embodiment or the second embodiment, and the method specifically comprises the following steps:
a time acquisition module: the method comprises the steps of obtaining a reference time forwarded by client terminal equipment;
an acquisition module: the system comprises a data acquisition module, a data acquisition module and a data processing module, wherein the data acquisition module is used for acquiring information required by complete differential protection calculation through a 5G deterministic network by a client terminal device and an adjacent power distribution terminal;
a message generation module: the data message is generated by combining the information required by the differential protection calculation and the reference time;
a transmission module: the data message is transmitted to a power distribution management system through a 5G deterministic network so that the power distribution management system can execute differential protection calculation according to the data message;
the adjacent power distribution terminal refers to a power distribution terminal which is positioned on the same distribution line with the input end or the output end of the current power distribution terminal; the information required for the differential protection calculation at least comprises current sampling values flowing into and out of the power distribution terminal and time scale information of the current sampling values.
The power distribution terminal provided by the embodiment of the invention adopts a 5G deterministic network to replace a traditional optical fiber channel to communicate with the adjacent power distribution terminal and the power distribution management system, so that the real-time processing and fault isolation of the differential protection control of the power distribution network can be realized.
In order to further ensure the synchronization of the sampling time of each power distribution terminal, the power distribution terminal provided by the embodiment of the invention further comprises:
a calculation module: and the time delay is used for calculating the time delay of the information required by the next acquisition differential protection calculation according to the time scale information of the current sampling value and the reference time.
Specifically, the calculation module includes:
a first calculation submodule: the time scale information of the current sampling value of each power distribution terminal is calculated according to the average time deviation value of the current sampling reference time;
a second calculation submodule: and the time delay is used for carrying out summation operation on the average time deviation value and the next sampling reference time to acquire the information required by the next acquisition differential protection calculation.
The specific method for calculating the time delay of the information required for the next differential protection calculation can refer to the related contents described in the second embodiment.
Those skilled in the art will appreciate that the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Example four:
as shown in fig. 1, the structural schematic block diagram of a power distribution network differential protection system provided in an embodiment of the present invention includes:
a client terminal device: the system is used for forwarding the reference time to the power distribution terminal and realizing data exchange between the current power distribution terminal and the adjacent power distribution terminal through a 5G deterministic network;
a power distribution terminal: the data exchange module is used for acquiring information required by complete differential protection calculation through data exchange and generating a data message by combining the reference time and the acquired information required by the differential protection calculation;
the power distribution management system comprises: the system comprises a 5G deterministic network, a data message and a differential protection calculation module, wherein the data message is used for receiving a data message generated by a power distribution terminal through the 5G deterministic network and executing the differential protection calculation according to the data message;
the information required by the differential protection calculation at least comprises current sampling values flowing into and out of the power distribution terminal and time scale information of the current sampling values.
It should be noted that: there may be a plurality of such distribution terminals, only three of which are shown in fig. 1 for purposes of illustration. In fig. 1, the input ends or the output ends of the three power distribution terminals are located on the same distribution line, and the power distribution terminals are adjacent to each other. The power distribution management system is a part of a power distribution main station, and differential protection calculation and differential protection instruction generation can be realized through an existing computer program.
As an embodiment of the present invention, the power distribution network differential protection system may further include:
the time synchronization server: for periodically transmitting a broadcast frame written with a reference time through a 5G deterministic network;
the client terminal device: the system is also used for acquiring the broadcast frame through a 5G deterministic network and extracting a reference time from the broadcast frame;
the power distribution terminal: the time delay calculation method is further configured to extract time scale information in the information required for the differential protection calculation, and calculate the time delay for acquiring the information required for the differential protection calculation next time according to the time scale information and the reference time, and the specific calculation method may refer to the related content described in embodiment two.
The 5G deterministic network can perform bidirectional mapping and cooperation on services and networks by measuring and predicting deterministic network indexes of time scale information in a data message, and a network management system performs resource arrangement and slice management. The 5G deterministic network can establish an end-to-end slice, realize the deterministic communication among all nodes of the system, simultaneously sense and monitor the real-time communication quality, and ensure the communication quality.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A differential protection method for a power distribution network is executed by a power distribution terminal, and is characterized by comprising the following steps:
acquiring reference time forwarded by client terminal equipment;
data exchange is carried out between the client terminal equipment and the adjacent power distribution terminal through a 5G deterministic network so as to collect information required by complete differential protection calculation;
combining the reference time and the acquired information required by differential protection calculation to generate a data message;
transmitting the data message to a power distribution management system through a 5G deterministic network so that the power distribution management system can perform differential protection calculations from the data message;
the adjacent power distribution terminal refers to a power distribution terminal which is positioned on the same distribution line with the input end or the output end of the current power distribution terminal; the information required for the differential protection calculation at least comprises current sampling values flowing into and out of the power distribution terminal and time scale information of the current sampling values.
2. The differential protection method for the power distribution network according to claim 1, wherein the information required for the differential protection calculation further includes a switch state for the differential protection control of the power distribution terminal.
3. The differential protection method for a power distribution network of claim 1, further comprising:
and calculating the time delay of the information required by the next acquisition differential protection calculation according to the time scale information of the current sampling value and the reference time.
4. The differential protection method for the power distribution network according to claim 3, wherein the method for calculating the time delay for collecting the information required for the differential protection calculation next time comprises the following steps:
calculating the average time deviation amount of the time scale information of the current sampling value of each power distribution terminal relative to the current sampling reference time;
and performing summation operation on the average time deviation value and the next sampling reference time to acquire the time delay of the information required by the next acquisition differential protection calculation.
5. The differential protection method for the power distribution network according to claim 3, wherein the format of the data message is as follows:
The DTU _ m, DTU _ n and DTU _ k are all required information for differential protection calculation acquired from adjacent power distribution terminals through data exchange, and the Time _0 is reference Time; the CRC is a check bit.
6. A power distribution terminal, comprising:
a time acquisition module: the method comprises the steps of obtaining a reference time forwarded by client terminal equipment;
an acquisition module: the system comprises a data acquisition module, a data acquisition module and a data processing module, wherein the data acquisition module is used for acquiring information required by complete differential protection calculation through a 5G deterministic network by a client terminal device and an adjacent power distribution terminal;
a message generation module: the data message is generated by combining the reference time and the information required by the differential protection calculation;
a transmission module: the data message is transmitted to a power distribution management system through a 5G deterministic network, so that the power distribution management system can execute differential protection calculation according to the data message;
the adjacent power distribution terminal refers to a power distribution terminal which is positioned on the same distribution line with the input end or the output end of the current power distribution terminal; the information required for the differential protection calculation at least comprises current sampling values flowing into and out of the power distribution terminal and time scale information of the current sampling values.
7. The power distribution terminal of claim 6, further comprising:
a calculation module: and the time delay is used for calculating the time delay of the information required by the next acquisition differential protection calculation according to the time scale information of the current sampling value and the reference time.
8. The power distribution terminal of claim 7, wherein the computing module comprises:
a first calculation submodule: the time scale information of the current sampling value of each power distribution terminal is calculated according to the average time deviation value of the current sampling reference time;
a second calculation submodule: and the time delay is used for carrying out summation operation on the average time deviation value and the next sampling reference time to acquire the information required by the next acquisition differential protection calculation.
9. A power distribution network differential protection system, comprising:
a client terminal device: the system is used for forwarding the reference time to the power distribution terminal and realizing data exchange between the current power distribution terminal and the adjacent power distribution terminal through a 5G deterministic network;
a power distribution terminal: the data exchange module is used for acquiring information required by complete differential protection calculation through data exchange and generating a data message by combining the reference time and the acquired information required by the differential protection calculation;
the power distribution management system comprises: the system comprises a 5G deterministic network, a data message and a differential protection calculation module, wherein the data message is used for receiving a data message generated by a power distribution terminal through the 5G deterministic network and executing the differential protection calculation according to the data message;
the adjacent power distribution terminal refers to a power distribution terminal which is positioned on the same distribution line with the input end or the output end of the current power distribution terminal; the information required for the differential protection calculation at least comprises current sampling values flowing into and out of the power distribution terminal and time scale information of the current sampling values.
10. The power distribution network differential protection system of claim 9, further comprising:
the time synchronization server: for periodically transmitting a broadcast frame written with a reference time through a 5G deterministic network;
the client terminal device: the system is also used for acquiring the broadcast frame through a 5G deterministic network and extracting a reference time from the broadcast frame;
the power distribution terminal: and the time delay unit is also used for calculating the time delay of the information required by the next acquisition differential protection calculation according to the time scale information of the current sampling value and the reference time.
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