CN115360677A - Differential protection system of power distribution network and power distribution network - Google Patents
Differential protection system of power distribution network and power distribution network Download PDFInfo
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- CN115360677A CN115360677A CN202210737253.1A CN202210737253A CN115360677A CN 115360677 A CN115360677 A CN 115360677A CN 202210737253 A CN202210737253 A CN 202210737253A CN 115360677 A CN115360677 A CN 115360677A
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
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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
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
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Abstract
The invention discloses a differential protection system of a power distribution network and the power distribution network, and relates to the field of the power distribution network.A first protection device and a second protection device respectively obtain a first current value and a second current value on different nodes of the power distribution network and respectively send the first current value and the second current value to first CPE (customer premises equipment) and second CPE (customer premises equipment), then the first CPE and the second CPE send the first current value and the second current value to a core network in a wireless transmission mode for differential protection analysis, and the power distribution network is determined to be normal when the first current value and the second current value are equal based on the kirchhoff current theorem; and determining that the power distribution network is abnormal when the first current value and the second current value are not equal. And the first CPE equipment and the second CPE equipment send the first current value and the second current value to the core network in a wireless transmission mode, so that the time delay of data transmission can be reduced, and the reliability of differential protection of the power distribution network is improved.
Description
Technical Field
The invention relates to the field of power distribution networks, in particular to a power distribution network differential protection system and a power distribution network.
Background
With the rapid development of society, the electric power provided by the traditional power generation mode can not meet the electric power demand of people far, and under the condition, the distributed power supply is generated immediately, but a plurality of problems still exist after the distributed power supply is connected to a power distribution network, such as unstable voltage of the power distribution network, low electric energy quality and unreliable relay protection. Therefore, there is a need for differential protection of power distribution networks to improve the safety and reliability of operation of the power distribution network.
Disclosure of Invention
The invention aims to provide a power distribution network differential protection system and a power distribution network, which can perform differential protection on the power distribution network, reduce the time delay of data transmission in the differential protection process of the power distribution network and improve the reliability of the differential protection of the power distribution network.
In order to solve the above technical problem, the present invention provides a power distribution network differential protection system, including:
the first protection device is used for acquiring a first current value of a first test node of the power distribution network and sending the first current value to first CPE equipment through a first interface;
the first CPE equipment is used for transmitting the first current value to a base station through a first wireless transmission module;
the first wireless transmission module;
the second protection device is used for acquiring a second current value of a second test node of the power distribution network and sending the second current value to second CPE equipment through a second interface;
the second CPE device is configured to transmit the second current value to the base station through a second wireless transmission module;
the second wireless transmission module;
the base station is used for sending the first current value and the second current value to a core network;
the core network is used for judging whether the first current value and the second current value are equal; if so, determining that the power distribution network between the first test node and the second test node is normal; and if not, determining that the power distribution network between the first test node and the second test node is abnormal.
Preferably, the first wireless transmission module is a first 5G wireless transmission module, and the second wireless transmission module is a second 5G wireless transmission module.
Preferably, the first protection device is specifically configured to obtain a first current value of a first test node of the power distribution network, convert the first current value into a first UDP packet according to a UDP protocol, and send the first UDP packet to the first CPE device through the first interface;
the second protection device is specifically configured to obtain a second current value of a second test node of the power distribution network, convert the second current value into a second UDP packet according to a UDP protocol, and send the second UDP packet to the second CPE device through the second interface.
Preferably, the first CPE device is specifically configured to transmit the first current value to the base station through the first 5G wireless transmission module according to a sampling value differential algorithm;
the second CPE device is specifically configured to transmit the second current value to the base station through the second 5G wireless transmission module according to the sampling value differential algorithm;
the base station is specifically configured to send both the first current value and the second current value to the core network according to the sampling value differential algorithm.
Preferably, the first CPE device is further configured to generate first time scale information and send the first time scale information to the first protection device;
the first protection device is further configured to adjust a clock of the first protection device to be consistent with a clock of the first CPE device after receiving the first time stamp information;
the second CPE device is further configured to generate second time scale information and send the second time scale information to the second protection device;
the second protection device is further configured to adjust a clock of the second protection device to be consistent with a clock of the second CPE device after receiving the second time stamp information.
Preferably, the first interface and the second interface are both dedicated electronic B-code time service ports.
Preferably, the protection device further includes a third remote interface module connected between the first CPE device and the first protection device, and configured to transmit third remote data between the first CPE device and the first protection device.
Preferably, the three-remote interface module is further configured to encrypt the three-remote data after receiving the three-remote data, and transmit the encrypted three-remote data to the first CPE device or the first protection device.
Preferably, the first protection device is specifically configured to obtain the first current value at every preset time interval when the first current value is within a first preset range, and send the first current value to the first CPE device; when the first current value is not within the first preset range, acquiring the first current value, and sending the first current value to the first CPE equipment;
the second protection device is specifically configured to obtain the second current value at intervals of the preset time period when the second current value is within a second preset range, and send the second current value to the second CPE device; and when the second current value is not within the second preset range, the second current value is obtained in real time and is sent to the first CPE equipment.
In order to solve the technical problem, the invention further provides a power distribution network which comprises the power distribution network differential protection system.
In summary, the present invention provides a power distribution network differential protection system and a power distribution network, including a first protection device, a first CPE device, a first wireless transmission module, a second protection device, a second CPE device, a second wireless transmission module, a base station, and a core network, where the first protection device and the second protection device respectively obtain a first current value and a second current value at different nodes of the power distribution network, and respectively send the first current value and the second current value to the first CPE device and the second CPE device, and then both the first CPE device and the second CPE device send the first current value and the second current value to the core network in a wireless transmission manner for differential protection analysis, and it is determined that the power distribution network is normal when the first current value and the second current value are equal based on the kirchhoff current theorem; and determining that the power distribution network is abnormal when the first current value and the second current value are not equal. And the first CPE equipment and the second CPE equipment send the first current value and the second current value to the core network in a wireless transmission mode, so that the time delay of data transmission can be reduced, and the reliability of differential protection of the power distribution network is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a power distribution network differential protection system provided by the present invention;
fig. 2 is a schematic structural diagram of another differential protection system for a power distribution network according to the present invention;
fig. 3 is a schematic diagram of a physical bearer of a UDP packet according to the present invention;
fig. 4 is a schematic diagram of another physical bearer of a UDP packet according to the present invention;
fig. 5 is a schematic diagram of another physical bearer of a UDP packet according to the present invention.
Detailed Description
The core of the invention is to provide the power distribution network differential protection system and the power distribution network, which can perform differential protection on the power distribution network, reduce the time delay of data transmission in the differential protection process of the power distribution network and improve the reliability of the differential protection of the power distribution network.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. 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 invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a power distribution network differential protection system provided in the present invention, where the power distribution network differential protection system includes:
the first protection device 1 is used for acquiring a first current value of a first test node of the power distribution network and sending the first current value to the first CPE equipment 2 through a first interface;
a first CPE device 2 for transmitting a first current value to a base station 7 by a first wireless transmission module 3;
a first wireless transmission module 3;
the second protection device 4 is used for acquiring a second current value of a second test node of the power distribution network and sending the second current value to the second CPE equipment 5 through a second interface;
a second CPE device 5 for transmitting the second current value to the base station 7 through a second wireless transmission module 6;
a second wireless transmission module 6;
the base station 7 is used for sending the first current value and the second current value to the core network 8;
the core network 8 is used for judging whether the first current value and the second current value are equal; if so, determining that the power distribution network between the first test node and the second test node is normal; and if not, determining that the power distribution network between the first test node and the second test node is abnormal.
With the distributed power supply connected to the power distribution network, the problems of unstable voltage, low voltage quality and unreliable relay protection of the power distribution network are urgently needed to be solved. Therefore, the power distribution network differential protection system is provided in the application, the current differential protection has the characteristics of simple principle, reliable action, wide application range, strong fault section selectivity and the like, and can well solve a plurality of troubles caused by the fact that a distributed power supply is connected into a power distribution network.
Specifically, when it is determined whether the power distribution network between the first test node and the second test node is abnormal, first, a first protection device 1 obtains a first current value of the first test node and a second protection device 4 obtains a second current value of the second test node, in the present application, the first protection device 1 and the second protection device 4 may be integrated in a DTU (Data Transfer unit), and a mainstream power distribution network terminal provider integrates a power distribution network differential protection device suitable for a high-precision time scale in a power distribution automation terminal. Then, the first protection device 1 sends the first current value to a first CPE (Customer Premise Equipment) device 2 through a first interface, and the second protection device 4 sends the second current value to a second CPE device 5 through a second interface.
In the present application, in order to reduce the delay time of the power distribution network differential protection, a first wireless transmission module 3 and a second wireless transmission module 6 are further provided, so that the first CPE device 2 can transmit the first current value to the base station 7 in a wireless transmission manner, and the second CPE device 5 can transmit the second current value to the base station 7 in a wireless transmission manner, where the first wireless transmission device and the second wireless transmission device may be 5G wireless transmission devices, and the like, and the present application is not limited to this.
Based on kirchhoff's current law, the core network 8 judges whether the first current value and the second current value are equal after receiving the first current value and the second current value, if the first current value is equal to the second current value, the power distribution network between the first test node and the second test node is determined to be normal, and if the first current value is not equal to the second current value, the power distribution network between the first test node and the second test node is determined to be abnormal, so that differential protection of the power distribution network is realized.
In summary, the present invention provides a power distribution network differential protection system and a power distribution network, including a first protection device 1, a first CPE device 2, a first wireless transmission module 3, a second protection device 4, a second CPE device 5, a second wireless transmission module 6, a base station 7 and a core network 8, where the first protection device 1 and the second protection device 4 respectively obtain a first current value and a second current value at different nodes of the power distribution network, and respectively send the first current value and the second current value to the first CPE device 2 and the second CPE device 5, and then the first CPE device 2 and the second CPE device 5 both send the first current value and the second current value to the core network 8 in a wireless transmission manner for differential protection analysis, and determine that the power distribution network is normal when the first current value and the second current value are equal based on kirchhoff current theorem; and determining that the power distribution network is abnormal when the first current value and the second current value are not equal. In addition, the first CPE device 2 and the second CPE device 5 both send the first current value and the second current value to the core network 8 in a wireless transmission mode, so that the time delay of data transmission can be reduced, and the reliability of differential protection of the power distribution network can be improved.
On the basis of the above-described embodiment:
as a preferred embodiment, the first wireless transmission module 3 is a first 5G wireless transmission module, and the second wireless transmission module 6 is a second 5G wireless transmission module.
In the embodiment, the 5G wireless communication technology is expected to be a carrier for carrying power distribution network differential protection services in consideration of the advantages of ultrahigh reliability, low time delay and the like, and meanwhile, as one of leaders of 5G technologies, standards, industries and applications in China, a 5G smart grid application white paper is issued at the earliest, currently, the high-voltage power transmission and distribution field mainly uses optical fibers as communication carriers, and the application of 5G to power distribution network differential protection is the most typical and pioneering application of power supply of a power distribution network.
Referring to fig. 2, fig. 2 is a schematic structural diagram of another power distribution network differential protection system provided by the present invention, a power distribution network differential protection communication architecture based on 5G wireless communication is composed of a protection device, CPE devices, a base station 7, a transmission network and a core network 8, the protection device is connected with the CPE devices through an ethernet port, the CPE devices are communicated with the base station 7 through a 5G wireless mode, and the transmission network and the core network 8 complete data exchange between different base stations 7. In summary, in this embodiment, the first wireless transmission module 3 and the second wireless transmission module 6 are set as 5G wireless transmission modules, which can reduce the delay of the differential protection of the power distribution network, and further optimize the differential protection of the power distribution network.
As a preferred embodiment, the first protection device 1 is specifically configured to obtain a first current value of a first test node of the power distribution network, convert the first current value into a first UDP packet according to a User Datagram Protocol (UDP), and send the first UDP packet to the first CPE device 2 through the first interface;
the second protection device 4 is specifically configured to obtain a second current value of a second test node of the power distribution network, convert the second current value into a second UDP packet according to a UDP protocol, and send the second UDP packet to the second CPE device 5 through the second interface.
In this embodiment, considering that a 5G communication network requires to transmit an IP protocol packet, a transport layer may adopt a TCP and a UDP protocol, where the TCP protocol is mainly applied to a scenario with high reliability requirement and weak real-time performance; the UDP protocol is a connectionless protocol, can improve transmission efficiency, and is widely applied to services with large data volume and strong real-time performance. Considering that the transmission mode of the differential protection information is similar to the UDP protocol and is a "connectionless" message, and the sending and receiving of the information do not require the connection establishment and the session confirmation at both ends, therefore, in this embodiment, the UDP message is used as the power grid differential protection information interaction message based on the 5G communication.
Referring to fig. 3, fig. 4 and fig. 5, fig. 3 is a schematic diagram of a physical bearer of a UDP packet according to the present invention, fig. 4 is a schematic diagram of a physical bearer of another UDP packet according to the present invention, fig. 5 is a schematic diagram of a physical bearer of another UDP packet according to the present invention, and SV (Sampled Value) data Sampled by a DTU (discrete Value) that is a protection device in fig. 3, fig. 4 and fig. 5 is subjected to protocol conversion to form a UDP packet that can be transmitted over a wireless communication network.
As a preferred embodiment, the first CPE device 2 is specifically configured to transmit the first current value to the base station 7 through the first 5G wireless transmission module according to a sampling value differential algorithm;
the second CPE device 5 is specifically configured to transmit the second current value to the base station 7 through the second 5G wireless transmission module according to a sampling value differential algorithm;
the base station 7 is specifically configured to send both the first current value and the second current value to the core network 8 according to a sampling value differential algorithm.
In this embodiment, for flow control, the CPE device transmits a current value by using a sampling value differential algorithm. Specifically, in order to effectively control the flow of the data to be sent, an optimization algorithm is needed to reduce the size of a data frame, the current common differential protection data calculation method comprises a vector differential algorithm and a sampling value differential algorithm, when the vector differential algorithm is used, the byte of each frame is 63 bytes, 4 frames are sent every period, and the data transmission amount every second is 100kbits/s; when the sampling value differential algorithm is used, the byte of each frame is 79 bytes, 12 frames are sent every period, the data transmission amount per second is 379.2kbits/s, and the sampling value differential algorithm can reduce the data transmission flow.
In this embodiment, data transmission needs to be performed between the first CPE device 2 and the base station 7, between the second CPE device 5 and the base station 7, and between the base station 7 and the core network 8, and in order to reduce the traffic of data transmission, a sampling value differential algorithm is adopted when data transmission is performed between the first CPE device 2 and the base station 7, between the second CPE device 5 and the base station 7, and between the base station 7 and the core network 8, so that the occupation of bandwidth resources by a single terminal is reduced, and the problem of resource shortage can be alleviated.
As a preferred embodiment, the first CPE device 2 is further configured to generate first time scale information, and send the first time scale information to the first protection apparatus 1;
the first protection device 1 is further configured to adjust a clock of the first protection device 1 to be consistent with a clock of the first CPE device 2 after receiving the first time stamp information;
the second CPE device 5 is further configured to generate second time scale information, and send the second time scale information to the second protection device 4;
the second protection device 4 is further configured to, after receiving the second timestamp information, adjust a clock of the second protection device 4 to be consistent with a clock of the second CPE device 5.
The requirement of the differential protection of the power distribution network on data on two sides is high, otherwise, errors can be generated in current sampling, and the judgment of the differential protection of the power distribution network is abnormal, so that how to realize data synchronization in the differential protection of the power distribution network is a main problem. At present, data synchronization methods include a sampling data correction method, a sampling time adjustment method, a sampling clock calibration method, a sampling sequence number adjustment method, an external synchronization signal method, a reference vector based synchronization method, a fault signal based synchronization method, and the like. In order to ensure the accuracy of the differential protection of the power distribution network, in this embodiment, clock calibration is performed among the first CPE device 2, the second CPE device 5, the first protection device 1, and the second protection device 4, so as to ensure that a first current value and a second current value compared when the core network 8 performs the differential protection are current values at the same time.
Specifically, in this embodiment, the first CPE device 2 is further configured to generate first time scale information, and send the first time scale information to the first protection device 1, where the first protection device 1 can analyze the first time scale information after receiving the first time scale information to obtain a clock of the first CPE device 2, and then the first protection device 1 adjusts the clock of the first protection device 1 to be consistent with the clock of the first CPE device 2. The second CPE device 5 is further configured to generate second time scale information, and send the second time scale information to the second protection device 4, where the second protection device 4 can analyze the second time scale information after receiving the second time scale information to obtain a clock of the second CPE device 5, and then the second protection device 4 adjusts the clock of the second protection device 4 to be consistent with the clock of the second CPE device 5. Finally, clock consistency of power distribution network differential protection is achieved.
As a preferred embodiment, the first interface and the second interface are both dedicated electronic B-code time service ports.
In this embodiment, considering that a time service function is crucial to data synchronization on both sides of the differential protection of the power distribution network, and comprehensively evaluating factors such as the influence of time service on data services, the first interface and the second interface both select to adopt B code pairs. Meanwhile, considering that the distance between the first protection device 1 and the second protection device 4 and the communication interface equipment is short, the electromagnetic compatibility influence is not large, the requirement of adopting optical fiber communication is not urgent, and from the cost perspective, the electric Ethernet port is cheaper than the optical Ethernet port, the economy is better, and by combining the above factors, in the embodiment, the first interface and the second interface are both dedicated electric B code time service ports.
As a preferred embodiment, the system further includes a triple-remote interface module connected between the first CPE device 2 and the first protection apparatus 1, and configured to transmit triple-remote data between the first CPE device 2 and the first protection apparatus 1.
In this embodiment, considering that there are many services that the terminal of the power distribution network needs to support, such as triple-remote service, differential service, video, etc., and can be summarized as incoming master station service, cross-base station service, and synchronous time-setting service, considering various factors such as information path and encryption requirements of triple-remote service and differential service, and influence degree of encryption processing time consumption on the services, an interface for transmitting differential data and an interface for transmitting triple-remote data are preferably independent of each other. Specifically, data interaction of the triple-remote service is through terminal-base station-master station-base station-terminal, and data interaction of the differential service is only between terminal-base station-terminal. According to the DL/T1936-2018 safety protection technical guide of distribution automation system, the method comprises the following steps: the method is characterized in that the encryption measure of a symmetric cryptographic algorithm for detection and authentication of service data between a power distribution terminal and a main station through related national units is adopted, when the power distribution terminal is accessed to the power distribution automation main station in a communication mode such as wireless, a safety access area is set, and a micro longitudinal encryption recognition device is preferentially adopted for three remote services entering the main station. When the three-remote data is encrypted, the forms of an external security module, an internal security chip, a service terminal or a communication interface device embedded encryption algorithm and the like can be selected. The external security module does not need to carry out other hardware transformation and software configuration on the terminal equipment, adopts 100MHz running frequency, and the encryption operation time is about 200ms approximately.
The power distribution network has a mandatory encryption requirement for three remote services, and has no mandatory requirement for differential services. Therefore, in this embodiment, a triple-remote interface module for transmitting triple-remote data is additionally disposed between the first CPE device 2 and the first protection device 1, and similarly, a triple-remote interface module may also be additionally disposed between the second CPE device 5 and the second protection device 4. Three remote service ports and differential service ports of the power distribution network terminal are independent, and physical isolation between the ports and soft isolation between the services can play a role in protection.
In addition, the triple-remote data generally includes telemetry, and telemetry, which is not particularly limited in this application.
As a preferred embodiment, the three-remote interface module is further configured to encrypt the three-remote data after receiving the three-remote data, and transmit the encrypted three-remote data to the first CPE device 2 or the first protection apparatus 1.
In this embodiment, considering that a mandatory encryption requirement is imposed on the triple-remote service, the triple-remote interface module encrypts the triple-remote data after receiving the triple-remote data, and then transmits the encrypted triple-remote data to the first CPE device 2 or the first protection device 1, so that the requirement of the power distribution network on encryption of the triple-remote service is met, and the safety and reliability of the power distribution network are improved.
As a preferred embodiment, the first protection device 1 is specifically configured to obtain a first current value at every preset time interval when the first current value is within a first preset range, and send the first current value to the first CPE device 2; when the first current value is not within the first preset range, acquiring the first current value in real time, and sending the first current value to the first CPE device 2;
the second protection device 4 is specifically configured to obtain a second current value at every preset time interval when the second current value is within a second preset range, and send the second current value to the second CPE device 5; and when the second current value is not within the second preset range, acquiring the second current value in real time, and sending the second current value to the first CPE device 2.
In this embodiment, in order to further reduce the traffic generated by data transmission, different data transmission modes are selected between the first protection device 1 and the first CPE device 2 and between the second protection device 4 and the second CPE device 5 for different situations of the power distribution network, so as to further reduce the data uploading frequency, and the point-to-point transmission mechanism is changed into the abnormal transmission mechanism.
Specifically, when the power distribution network between the first test node and the second test node is normal, that is, when the first current value is within a first preset range, the first protection device 1 obtains the first current value at intervals of a preset time period, and sends the first current value to the first CPE device 2; when the power distribution network between the first test node and the second test node is abnormal, that is, the first current value is not within the first preset range, the first protection device 1 obtains the first current value in real time and sends the first current value to the first CPE device 2, so as to ensure that the core network 8 can further accurately judge the abnormal condition of the power distribution network.
In conclusion, in this embodiment, different data transmission modes are selected between the first protection device 1 and the first CPE device 2 and between the second protection device 4 and the second CPE device 5 according to different conditions of the power distribution network, so that the flow generated by data transmission can be further reduced, and the problem of resource shortage is alleviated.
In order to solve the technical problem, the invention further provides a power distribution network which comprises the power distribution network differential protection system.
For the related introduction of the power distribution network provided by the present invention, please refer to the above embodiment of the power distribution network differential protection system, which is not described herein again.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed in the embodiment corresponds to the method disclosed in the embodiment, so that the description is simple, and the relevant points can be referred to the description of the method part.
It is further noted that, in the present specification, 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 one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A power distribution network differential protection system, comprising:
the first protection device is used for acquiring a first current value of a first test node of the power distribution network and sending the first current value to first CPE equipment through a first interface;
the first CPE equipment is used for transmitting the first current value to a base station through a first wireless transmission module;
the first wireless transmission module;
the second protection device is used for acquiring a second current value of a second test node of the power distribution network and sending the second current value to second CPE equipment through a second interface;
the second CPE device is configured to transmit the second current value to the base station through a second wireless transmission module;
the second wireless transmission module;
the base station is used for sending the first current value and the second current value to a core network;
the core network is used for judging whether the first current value and the second current value are equal; if so, determining that the power distribution network between the first test node and the second test node is normal; and if not, determining that the power distribution network between the first test node and the second test node is abnormal.
2. The differential protection system for a power distribution network of claim 1, wherein the first wireless transmission module is a first 5G wireless transmission module, and the second wireless transmission module is a second 5G wireless transmission module.
3. The power distribution network differential protection system according to claim 2, wherein the first protection device is specifically configured to obtain a first current value of a first test node of the power distribution network, convert the first current value into a first UDP message according to a UDP protocol, and send the first UDP message to the first CPE device through the first interface;
the second protection device is specifically configured to obtain a second current value of a second test node of the power distribution network, convert the second current value into a second UDP packet according to a UDP protocol, and send the second UDP packet to the second CPE device through the second interface.
4. The power distribution network differential protection system of claim 2, wherein the first CPE device is specifically configured to transmit the first current value to the base station via the first 5G wireless transmission module according to a sampled value differential algorithm;
the second CPE device is specifically configured to transmit the second current value to the base station according to the sampling value differential algorithm through the second 5G wireless transmission module;
the base station is specifically configured to send both the first current value and the second current value to the core network according to the sampling value differential algorithm.
5. The power distribution network differential protection system of claim 1, wherein the first CPE device is further configured to generate first time scale information and send the first time scale information to the first protection device;
the first protection device is further configured to adjust a clock of the first protection device to be consistent with a clock of the first CPE device after receiving the first time stamp information;
the second CPE device is further configured to generate second time scale information and send the second time scale information to the second protection device;
the second protection device is further configured to adjust a clock of the second protection device to be consistent with a clock of the second CPE device after receiving the second time stamp information.
6. The differential protection system for a power distribution network of claim 1, wherein the first interface and the second interface are both dedicated electrical B-code timing ports.
7. A power distribution network differential protection system according to claim 1, further comprising a triple-telemetry interface module connected between the first CPE device and the first protection apparatus for transmitting triple-telemetry data between the first CPE device and the first protection apparatus.
8. The power distribution network differential protection system of claim 6, wherein the three-remote interface module is further configured to encrypt the three-remote data after receiving the three-remote data, and transmit the encrypted three-remote data to the first CPE device or the first protection device.
9. The power distribution network differential protection system according to any one of claims 1 to 8, wherein the first protection device is specifically configured to obtain the first current value at intervals of a preset time period when the first current value is within a first preset range, and send the first current value to the first CPE device; when the first current value is not within the first preset range, acquiring the first current value, and sending the first current value to the first CPE equipment;
the second protection device is specifically configured to obtain the second current value at intervals of the preset time period when the second current value is within a second preset range, and send the second current value to the second CPE device; and when the second current value is not within the second preset range, the second current value is obtained in real time and is sent to the first CPE equipment.
10. An electrical distribution network comprising a differential protection system for an electrical distribution network according to any of claims 1 to 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116233273A (en) * | 2023-05-09 | 2023-06-06 | 国网信息通信产业集团有限公司 | Message transmission system and method based on 5G communication network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116233273A (en) * | 2023-05-09 | 2023-06-06 | 国网信息通信产业集团有限公司 | Message transmission system and method based on 5G communication network |
| CN116233273B (en) * | 2023-05-09 | 2023-08-01 | 国网信息通信产业集团有限公司 | Message transmission system and method based on 5G communication network |
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