CN115549036A - Distributed new energy relay protection system based on 5G - Google Patents
Distributed new energy relay protection system based on 5G 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
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- 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
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
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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
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
Abstract
The application provides a distributed new forms of energy relay protection system based on 5G, has solved among the prior art differential protection and has laid with high costs, the construction degree of difficulty is big, the big problem of external force destruction risk, can't deal with the technical problem of distribution network mass connection demand. According to the distributed new energy relay protection system, data of the 5G base station is transmitted in the core network, and end-to-end and multi-end data interaction of differential protection is completed in a network transmission mode of the core network-5G base station-client terminal equipment, so that rapid fault removal is realized. In the whole differential current protection process, because there is 5G communication strong reliability, the time delay is low, can deal with distribution network mass connection demand, in addition because need not adopt optical cable communication, also can not take place the circuit power failure in order to cooperate the maintenance behind the optical cable sinle silk butt fusion UNICOM, consequently improved the stability of whole circuit. The load loss and the construction difficulty brought by power failure operation are effectively reduced, and the risk that the differential protection communication channel is damaged by the operation environment and external force is avoided.
Description
Technical Field
The application relates to the technical field of relay protection of power distribution networks of power systems, in particular to a 5G-based distributed new energy relay protection system.
Background
At present, with the massive access of distributed power supplies, the fault characteristics of a power distribution network are remarkably changed, the traditional fault location and isolation method relying on an overcurrent protection element is greatly challenged, on the other hand, the topological structure of the power distribution network is complex, the setting is difficult due to the fact that the common overcurrent protection fixed value cannot be well matched, in the existing access mode, distributed new energy is accessed into a power grid with the voltage level of 35kV or below in a T connection mode, when the distributed power supply 2 is accessed into the system through a station C, on one hand, the original line protection A, B at two ends of an access point needs to be replaced by a device suitable for three-end optical fiber differential, in the replacement process, relay protection is not needed at two ends of a station A-B line, power failure needs to be matched, load loss of the station B is caused, on the other hand, the line protection C needs to establish information connection with a line protection A, B, optical cables are usually laid synchronously along with the line, and after optical cable cores are communicated in a fusion mode, communication professionals of an electric power company are needed to set up connection parameters, and communication mode management is completed.
The current differential protection is a mature protection technology applied in the high-voltage transmission network, has the characteristics of simple principle, reliable action, adaptability to multi-terminal power access, strong fault section selectivity and the like, and can well solve a plurality of troubles brought to a power distribution network by distributed power access and avoid the problem of mismatch of protection constant value setting. However, the traditional differential protection mainly uses optical fiber dedicated line communication, and the existing protection configuration and pipeline channel access scheme have the following disadvantages: 1. the optical cable laying and fusion needs circuit matching power failure, so that load loss is caused, the laying cost is high, the construction difficulty is high, and the period is long; 2. the optical fiber laying involves material cost, large amount of manual investment and the like, so that the investment cost is high; 3. the communication optical cable is erected and operated along with the line, the controllability of the operation environment is poor, the risk of external force damage is large, the operation and maintenance difficulty is large, the protection configuration is not flexible, and the requirement of massive connection of a power distribution network cannot be met.
Disclosure of Invention
In view of this, the application provides a distributed new energy relay protection system based on 5G, which solves the technical problems that the traditional differential protection in the prior art is mainly based on optical fiber communication, has high laying cost, high construction difficulty, inflexible protection configuration, high operation and maintenance difficulty and high external force damage risk, and cannot meet the requirement of massive connection of a power distribution network.
The application provides a distributed new forms of energy relay protection system based on 5G for the protection is located first transformer and the second transformer at circuit both ends, wherein, distributed new forms of energy relay protection system includes: a 5G base station; a first client terminal device; a first protection device in communication connection with the first client terminal device; and a second protection device in communication connection with the second client terminal device; wherein a first current signal of the first transformer is transmitted to the second protection device via the first customer terminal equipment and the 5G base station; a second current signal of the second transformer is transmitted to the first protection device through the second customer terminal equipment and the 5G base station; at least one of the first and second protection devices is configured to: and carrying out differential calculation according to the first current signal and the second current signal to generate a differential current, and generating a differential control signal when the differential current is within a differential protection preset range, wherein the differential control signal is used for disconnecting the line.
In an embodiment of the application, the distributed new energy relay protection system further includes: a first current transformer communicatively coupled to the first protection device, the first current transformer configured to detect the first current signal of the first transformer; and the second current transformer is in communication connection with the second protection device and is used for detecting the second current signal of the second transformer.
In an embodiment of the present application, the first client terminal device includes: the first data receiving module is in communication connection with the 5G base station; the first data conversion module is in communication connection with the first protection device and the first data receiving module; the first time-alignment module is in communication connection with the 5G base station and the first data conversion module; wherein the second current signal passes through the second client terminal device, the 5G base station, the first data receiving module to the first data converting module; the first time synchronization module synchronizes the second current signal with the first current signal, so that the first current signal and the second current signal are current signals of the first transformer and the second transformer at the same time.
In an embodiment of the present application, the first client terminal device includes: the second data receiving module is in communication connection with the 5G base station; the second data conversion module is respectively in communication connection with the first protection device and the second data receiving module; wherein, distributed new forms of energy relay protection system still includes: a first time synchronization device, communicatively connected to the first protection device and the 5G base station, wherein the second current signal passes through the second client terminal device, the 5G base station, the second data receiving module, and the second data conversion module to the first protection device; the first time synchronization device performs time synchronization on the second current signal and the first current signal, so that the first current signal and the second current signal are current signals of the first transformer and the second transformer at the same time.
In an embodiment of the application, the distributed new energy relay protection system further includes: the first relay and the second relay are arranged on the circuit; two ends of the first relay are respectively and electrically connected with the first transformer and the second relay, and two ends of the second relay are respectively and electrically connected with the second transformer and the first relay; the first relay is in communication with the first protection device, and the second relay is in communication with the second protection device, wherein the first relay is opened under the control of the differential control signal to disconnect the line; or the second relay is opened under the control of the differential control signal to disconnect the line.
In an embodiment of the present application, the first client terminal device and the 5G base station transmit signals through a UDP/IP protocol; and the second client terminal equipment and the 5G base station transmit signals through a UDP/IP protocol.
In an embodiment of the application, the distributed new energy relay protection system further includes: a first line electrical detector disposed on the line for detecting an electrical parameter on the line; the first protection device includes:
the first fault detection unit is in communication connection with the first line electrical detector and is used for judging whether the line has a fault according to the electrical parameters; the first differential protection unit is respectively in communication connection with the first fault detection unit and the first current transformer; wherein the first differential protection unit is configured to: when the first fault detection unit judges that the line has a fault, differential calculation is carried out according to the first current signal and the second current signal to generate a differential current, and when the differential current is within a differential protection preset range, a differential control signal is generated and used for disconnecting the line.
In an embodiment of the present application, the first line electrical detector includes: any one of a current abrupt change element, an overcurrent element, and a zero sequence element.
In an embodiment of the present application, the output voltage of the first transformer is greater than the output voltage of the second transformer, and the first differential protection unit is further configured to: and transmitting the fault signal to the second protection device, and transmitting the second current data to the first protection device by the second protection device through the second customer terminal equipment, the 5G base station and the first customer terminal equipment according to the fault signal.
In an embodiment of the present application, the first client terminal device and the first protection device are in communication connection by using a serial port or a network cable; and the second client terminal equipment is in communication connection with the second protection device by adopting a serial port or a network cable.
Distributed new forms of energy relay protection system, through first customer terminal equipment, second customer terminal equipment and 5G terminal, transmit the first current signal of first transformer end and the second current signal of second transformer end, then first protection device and second protection device carry out differential current according to the current signal of this end and the current signal of the opposite terminal that receives through 5G communication and calculate, when differential current when differential protection presets the within range, the disconnection circuit. Namely, the data of the 5G base station is transmitted in the core network, and the end-to-end and multi-end data interaction of differential protection is completed in a network transmission mode of the core network-5G base station-client terminal equipment, so that the fault is quickly removed.
In addition, in the whole differential current protection process, signals are transmitted through 5G signals, and the 5G communication has high reliability and low time delay, so that the requirement of mass connection of the power distribution network can be met. Because adopt 5G communication to transmit data and signal, need not adopt optical cable communication, also can not take place the cable core butt fusion after the UNICOM circuit power failure in order to cooperate the maintenance, consequently improved the stability of whole circuit. The load loss and the construction difficulty caused by power failure operation are effectively reduced, and the risk that the differential protection communication channel is damaged by the operating environment and external force is avoided.
Drawings
The above and other objects, features and advantages of the present application will become more apparent by describing in more detail embodiments of the present application with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings, like reference numbers generally represent like parts or steps.
Fig. 1 is a working schematic diagram of a distributed new energy relay protection system based on 5G in the prior art;
fig. 2 is a working schematic diagram of a distributed new energy relay protection system based on 5G according to an embodiment of the present application;
fig. 3 is a working schematic diagram of a distributed new energy relay protection system based on 5G according to another embodiment of the present application;
fig. 4 is a schematic diagram illustrating a GOOSE transmission time mechanism in data transmission of a 5G-based distributed new energy relay protection system according to an embodiment of the present application;
fig. 5 is a schematic diagram illustrating a data sampling synchronization principle of a 5G-based distributed new energy relay protection system according to an embodiment of the present application;
fig. 6 is a working schematic diagram of data of a 5G-based distributed new energy relay protection system according to another embodiment of the present application;
fig. 7 is a schematic diagram illustrating a data sampling synchronization principle of a distributed new energy relay protection system based on 5G according to another embodiment of the present application;
fig. 8 is a schematic diagram illustrating a data sampling synchronization principle of a distributed new energy relay protection system based on 5G according to another embodiment of the present application.
Detailed Description
In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. In the embodiment of the present application, all directional indicators (such as upper, lower, left, right, front, rear, top, bottom … …) are used only for explaining the relative position relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed correspondingly. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Furthermore, reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the 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.
Fig. 1 is a schematic diagram of a working principle of a distributed new energy relay protection system based on 5G according to an embodiment of the present application, and as shown in fig. 1, the distributed new energy relay protection system includes:
a 5G base station; a first Customer premises Equipment CPE1 (Customer Premise Equipment, hereinafter CPE 1) and a second Customer premises Equipment CPE2 (Customer Premise Equipment, hereinafter CPE 2); a first protection device 200 in communication connection with a first customer premises equipment CPE1; and a second protection device 300 communicatively connected to a second customer premises equipment CPE2;
the first customer premises equipment CPE1 is configured to convert a first current signal on a line close to the first transformer 400 into a first 5G current signal, and transmit the first 5G current signal to the second customer premises equipment CPE2 through a 5G base station; the second customer premises equipment CPE2 is configured to convert a second current signal on a line close to the second transformer 500 into a second 5G current signal, and transmit the second 5G current signal to the first customer premises equipment CPE1 through the 5G base station; the first customer premises equipment CPE1 is further configured to convert the second 5G current signal into a second current signal; the second customer premises equipment CPE2 is further configured to convert the first 5G current signal into a first current signal, where the first current signal and the second current signal are current signals of the first transformer 400 and the second transformer 500 at the same time respectively; that is, the first current signal is transmitted to the second protection device 300 through the first customer premises equipment CPE1 and the 5G base station; the second current signal is transmitted to the first protection device 200 through the second customer premises equipment CPE2 and the 5G base station;
then, at least one of the first protection device 200 and the second protection device 300 is configured to: and carrying out differential calculation according to the first current signal and the second current signal to generate a differential current, and generating a differential control signal when the differential current is within a differential protection preset range, wherein the differential control signal is used for disconnecting the line.
Specifically, as shown in fig. 1, the distributed new energy relay protection system based on 5G further includes: the first current transformer CT1 is in communication connection with the first protection device 200, and the first current transformer CT1 is used for detecting a first current signal of the first transformer 400; and a second current transformer CT2, the second current transformer CT2 being in communication connection with the second protection device 300, the second current transformer CT2 being configured to detect a second current signal of the second transformer 500.
As shown in fig. 1, the distributed new energy relay protection system based on 5G further includes: a first relay K1 and a second relay K2 which are arranged on a circuit; two ends of the first relay K1 are respectively and electrically connected with the first transformer 400 and the second relay K2, and two ends of the second relay K2 are respectively and electrically connected with the second transformer 500 and the first relay K1; the first relay K1 is in communication connection with the first protection device 200, and the second relay K2 is in communication connection with the second protection device 300, wherein the first relay K1 is disconnected under the control of the differential control signal to disconnect the line; or the second relay K2 is turned off under the control of the differential control signal to disconnect the line.
Specifically, the first customer premises equipment CPE1 and the first protection device 200 are in serial port or network communication connection;
the second customer premises equipment CPE2 is connected to the second protection device 300 by serial or network communication.
The application the distributed new energy relay protection system based on 5G, through first customer premises equipment CPE1, second customer premises equipment CPE2 and 5G terminal, transmit the first current signal of first transformer 400 end and the second current signal of second transformer 500 end, then first protection device 200 and second protection device 300 carry out differential current according to the current signal of this end and the current signal of the opposite end that receives through 5G communication and calculate, when differential current is in differential protection preset range, the circuit breaks off. Namely, the data of the 5G base station is transmitted in the core network, and the data interaction from end to end and from multiple ends of the differential protection is completed in a network transmission mode of the core network-5G base station-client terminal equipment, so that the fault is quickly removed.
In addition, in the whole differential current protection process, signals are transmitted through 5G signals, and the 5G communication is high in reliability and low in time delay, so that the requirement of mass connection of a power distribution network can be met. Because adopt 5G communication to transmit data and signal, need not adopt optical cable communication, also can not take place the cable core butt fusion after the UNICOM circuit power failure in order to cooperate the maintenance, consequently improved the stability of whole circuit. The load loss and the construction difficulty brought by power failure operation are effectively reduced, and the risk that the differential protection communication channel is damaged by the operation environment and external force is avoided.
In an embodiment of the present application, fig. 2 is a schematic diagram of an operation of a distributed new energy relay protection system based on 5G according to an embodiment of the present application, and as shown in fig. 2, a first customer premises equipment CPE1 includes: the first data receiving module 401, the first data receiving module 401 is in communication connection with the 5G base station; the first data conversion module 402, the first data conversion module 402 is in communication connection with the first protection device 200 and the first data receiving module 401 respectively; the first time-alignment module 403 is in communication connection with the 5G base station and the first data conversion module 402, and the first time-alignment module 403 performs time alignment on the second current signal and the first current signal; the second current signal passes through the second customer premises equipment CPE2, the 5G base station, the first data receiving module 401 to the first data converting module 402, and passes through the first time-pairing module 403 and the first data converting module 402, so that the second 5G current signal is converted into the second current signal, and the second current signal and the first current signal are current signals of the first transformer 400 and the second transformer 500 at the same time.
Similarly, as shown in fig. 2, the second customer premises equipment CPE2 comprises: the third data receiving module 501, the third data receiving module 501 is in communication connection with the 5G base station; a third data conversion module 502, wherein the third data conversion module 502 is in communication connection with the third data receiving module 501 and the second protection device 300; the second time alignment module 503 is in communication connection with the 5G base station and the third data conversion module 502, and the second time alignment module 503 aligns the first current signal and the second current signal; the first current signal passes through the first customer premises equipment CPE1, the 5G base station, the third data receiving module 501 to the third data conversion module 502, the first 5G current signal is converted into the first current signal through the second time-setting module 503 and the third data conversion module 502, and the first current signal and the second current signal are current signals of the line at the end of the first transformer 400 and the line at the end of the second transformer 500 at the same time.
The differential protection channel based on 5G has large delay jitter, unfixed transmission delay and inconsistent delays of the uplink and downlink channels, so that the first customer premises equipment CPE1 and the second customer premises equipment CPE2 in the embodiment of the present application both have a time synchronization function, which can reduce the probability of unfixed delay, and the delay is fixed, and the delay jitter probability of the differential protection channel is reduced.
In an embodiment of the present application, fig. 3 is a schematic diagram of an operation of a distributed new energy relay protection system based on 5G according to an embodiment of the present application, and as shown in fig. 3, a first customer premises equipment CPE1 includes: a second data receiving module 404, wherein the second data receiving module 404 is in communication connection with the 5G base station; the second data conversion module 405, the second data conversion module 405 is connected with the second data receiving module 404 in a communication way; wherein, distributed new forms of energy relay protection system still includes: the first timing device 600, the first timing device 600 is in communication connection with the first protection device 200 and the 5G base station, wherein the second current signal passes through the second customer premises equipment CPE2, the 5G base station, the second data receiving module 404 and the second data conversion module 405, the second data conversion module 405 converts the second 5G current signal into the second current signal, and the first timing device 600 performs timing on the second current signal and the first current signal, so that the first current signal and the second current signal are current signals of the first transformer 400 and the second transformer 500 at the same time.
The second customer premises equipment CPE2 comprises, in common with the first customer premises equipment CPE 1: a fourth data receiving module 504, wherein the fourth data receiving module 504 is in communication connection with the 5G base station; a fourth data conversion module 505, wherein the fourth data conversion module 505 is connected to the fourth data receiving module 504 in a communication manner; wherein, distributed new forms of energy relay protection system still includes: the second time synchronization device 700, the second time synchronization device 700 is in communication connection with the first protection device 200, 5G base station, wherein the first current signal passes through the first customer premises equipment CPE1, 5G base station, the fourth data receiving module 504 to the fourth data conversion module 505, the fourth data conversion module 505 converts the first 5G current signal into the second current signal, and the second time synchronization device 700 performs time synchronization on the second current signal and the first current signal, so that the first current signal and the second current signal are current signals when the line at the end of the first transformer 400 and the line at the end of the second transformer 500 are at the same time.
That is, in the distributed new energy relay protection system based on 5G shown in fig. 3, when the first customer premises equipment CPE1 and the second customer premises equipment CPE2 do not have a time synchronization function, the distributed new energy relay protection system further needs to include the first time synchronization device 600 and the second time synchronization device 700, so that a probability that a time delay is not fixed can be reduced, the time delay is fixed, and a time delay jitter probability of a differential protection channel is reduced.
In an embodiment of the present application, a first customer premises equipment CPE1 and a 5G base station transmit signals through a UDP/IP protocol; similarly, the second customer premises equipment CPE2 and the 5G base station transmit signals via the UDP/IP protocol. Fig. 4 is a schematic diagram illustrating a data sampling synchronization principle of a distributed new energy relay protection system based on 5G according to an embodiment of the present application, and as shown in fig. 4, the present application transmits current data through a UDP/IP protocol, and the transmitted current data is encapsulated in a UDP message through an SV (analog value sampling) and GOOSE (on-off event) format in an IEC61850 standard for transmission, so that the message structure is relatively larger. The SV is responsible for transmitting current sampling values, and the transmission mechanism of the SV is fixed high-frequency transmission (such as 2kHz in the project, and the bandwidth is close to 5 Mbit/s). GOOSE transmits switching value signals (differential input state, differential enable signal, other signals for expansion, etc.), and the transmission mechanism is to quickly retransmit data with short delay (t 1=2 ms) when data changes, and normally transmit data with heartbeat delay t0 (t 0=1000ms in the present process).
Specifically, as shown in fig. 4, the times of t0, t1, t2, and t3 default to: t0=1000ms, t1=2ms, t1: t2: t3= 1.
According to IEC61850 standard, R-SV packages APDU of SV message into session layer application protocol, and uses UDP/IP protocol as transmission layer to provide routable function for GOOSE information transmission. In a UDP protocol layer, the R-SV reuses a 102 port of IEC61850 and supports the transmission of unicast and multicast messages. The R-SV unicast and multicast publish-subscribe management needs support of APR protocol, IGMPv3 protocol and other protocols. The real-time response capability of communication is reduced due to factors such as TCP/IP protocol stack overhead, operating system and task scheduling. In order to further improve the real-time performance of the R-SV, a task direct-driven high-performance R-SV design scheme is adopted, wherein a high-priority task is responsible for the R-SV to publish and subscribe, and a low-priority task is responsible for the receiving and responding of protocols such as ARP and IGMP.
R-SV release: and starting a task at fixed time to encode the routable SV message, and storing the encoded message into a high-priority sending queue for immediate sending.
R-SV subscription: after being filtered by a hardware white list and a storm, the messages are respectively distributed to different tasks according to types for processing: allocating the type of the R-SV message to a high-priority task for processing; other types are assigned to low priority task processing.
Specifically, when the first client terminal device and the 5G base station transmit signals through a UDP/IP protocol; when the second client terminal device and the 5G base station transmit signals through a UDP/IP protocol, the working modes of the 5G-based distributed new energy relay protection system data sampling and differential protection provided by the present application may include the following two cases:
(1) Signal transmission in normal mode
Fig. 5 is a schematic diagram illustrating a data sampling synchronization principle of a 5G-based distributed new energy relay protection system according to an embodiment of the present application; as shown in fig. 5, time t, t = = t1+ t2+2 × Tdly + Tcb of line disconnection at the first transformer terminal (M terminal), where Tdly is a channel delay, tcb is a mechanism trip time (for example, a trip time of the first relay K1), t1 is a time from receiving the second current data at the second transformer terminal (N terminal) by the first protection device to calculating a differential condition, and t2 is a time from receiving the differential control signal sent by the first transformer terminal (M terminal) and the second transformer terminal (N terminal) by the first relay to the first relay performing a disconnection action.
(2) And transmitting signals in a flow-saving mode:
if the monthly data flow reaches 1TB according to the sampling rate of 2K, namely the message transmission of 2000 frames/second, the monthly data flow exceeds the monthly upper limit of a 5G network card, and the monthly communication cost is too high. Therefore, it is necessary to consider adopting a technique of saving traffic without affecting the protection performance as much as possible.
When the distribution network line has a fault, the differential protection of the distribution network line does not need to be strictly required to be carried out within 30ms as the main network does not relate to the problem of power grid stability. Considering that the overcurrent protection time constant value difference of the power distribution network is not less than 0.3s, 5G communication flow charging and protection action speed are comprehensively balanced, the 5G differential protection of the power distribution network can completely adopt a flow-saving mode, and only the differential protection is ensured to isolate faults within 0.2 s.
Therefore, fig. 6 is a working schematic diagram of data of a distributed new energy relay protection system based on 5G according to another embodiment of the present application; as shown in fig. 6, the distributed new energy relay protection system further includes: a first line electrical detector 800 disposed on the line for detecting an electrical parameter on the line; the first protection device 200 includes: the first fault detection unit 201, the first fault detection unit 201 is connected with the first line electrical detector 800 in a communication way, and the first fault detection unit 201 is used for judging whether the line has a fault according to the electrical parameters; a first differential protection unit 202, wherein the first differential protection unit 202 is respectively connected with the first fault detection unit 201 and the first current transformer CT1 in a communication manner; wherein the first differential protection unit 202 is configured to: when the first fault detection unit judges that the line has a fault, differential calculation is carried out according to the first current signal and the second current signal to generate a differential current, and when the differential current is within a differential protection preset range, a differential control signal is generated and used for disconnecting the line.
Specifically, the first line electrical detector 800 includes: any one of a current abrupt change element, an overcurrent element and a zero sequence element.
The distributed new energy relay protection system data based on 5G provided by the application is characterized in that a first fault detection unit is formed by a current sudden change element, an overcurrent element, a zero sequence element and the like, and whether a line has a fault or not is judged. When no fault occurs in the line, the data transmission adopts 1s handshake messages once to transmit some switching value signals related to protection, and the switching value signals are used for detecting the on-off state of the 5G network and giving an alarm in time. When a line fails, once the first fault detection unit detects the fault, the first client terminal device and the second client terminal device start to transmit high-flow analog quantity sampling data in a 5G communication mode, and the first differential protection unit performs differential calculation. Although the differential protection is slightly slower in operation time by several milliseconds compared to the normal transmission mode, this extra delay is the interval from the occurrence of the fault to the judgment of the fault by the first fault detection unit. If the line has no fault for one month, the flow can be controlled below 1G, the monthly communication cost is very low, and the cost is greatly reduced. In addition, if a failure occurs for 10s, the flow rate is consumed at about 5 MB. Even if there are multiple failures in a month, the consumed flow is limited.
Optionally, a common handshake frame is used, which can only detect the state of the network and cannot detect the case of abnormal differential flow, so that a periodic differential channel test needs to be considered. For example, 30s data is transmitted every 8 hours, and the current of the line at the first transformer side and the current of the line at the second transformer side are detected. The data flow of about 1GB can be increased in one month.
Specifically, when the data transmission is performed in the traffic-saving mode, the calculation method of the line disconnection time of the first transformer end and the second transformer end in the line may include the following two cases:
(i) When the output voltage difference of the first transformer and the output voltage of the second transformer is within the preset range, that is, the output voltage of the first transformer and the output voltage of the second transformer are approximately equal, the data sampling synchronization principle of the distributed new energy relay protection system based on 5G is shown in fig. 7; as shown in fig. 7, the time t, t = t0+ t1+ t2+2 tdly + tcb, t0 of the line disconnection at the first transformer end is the time from the fault occurrence to the protection of the entire group, as shown in fig. 4. the t0 time is typically within a few milliseconds (ms).
(ii) When the output voltage of the first transformer is greater than the output voltage of the second transformer, the first differential protection unit is further configured to: the differential control signal is transmitted to a second protection device, and the second protection device disconnects the line according to the differential control signal. That is, when the second transformer terminal of the line is a weak feed terminal, the weak feed terminal cannot generate a differential control signal by itself, and therefore, the first differential protection unit is further configured to transmit a fault signal to the second protection device, and the second protection device transmits the second current data of the second voltage transformer terminal to the second protection device according to the fault signal. In this case, the data sampling synchronization principle of the 5G-based distributed new energy relay protection system is shown in fig. 8; as shown in fig. 8, the time t of the line disconnection at the first transformer terminal M, t = t0+ t1+ t2+ t3+2 × tdly, and t1 is the time from receiving the sampling and start signal at the opposite side to starting to send the sampling data, t2 is the time from receiving the sampling data to calculating the differential condition, and t3 is the time from receiving the signals allowed at both sides to the protection action.
Because the weak feed end N (i.e., the second transformer end) cannot sense a fault and is started, it cannot send current data to the first transformer end when the fault just occurs, but needs to receive a fault signal sent by the first transformer end and then starts to send data, which may cause the first transformer end to receive the second current data sent by the weak feed side (the second transformer end) later, cause the differential control signal of the first transformer to be sent later, and finally cause the action time of the weak feed side (the second transformer end) to be longer. I.e. the weak feed side (second transformer terminal) action time = t0+ t1+ t2+ t3+3 × tdly.
In summary, the weak feed side action time is longest, and t0+ t1+ t2+ t3< =55ms, i.e., the differential protection can still be effective under the condition of maximum delay of 80ms in 5G communication.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the present invention, and any modifications, equivalents and the like that are within the spirit and scope of the present invention should be considered as being included therein.
Claims (10)
1. The utility model provides a distributed new forms of energy relay protection system based on 5G for protect first transformer and the second transformer that is located the circuit both ends, its characterized in that, distributed new forms of energy relay protection system includes:
a 5G base station; a first client terminal device; a first protection device in communication connection with the first client terminal device; and a second protection device in communication connection with the second client terminal device;
wherein a first current signal of the first transformer is transmitted to the second protection device via the first customer terminal equipment and the 5G base station; a second current signal of the second transformer is transmitted to the first protection device through the second customer terminal equipment and the 5G base station;
at least one of the first and second protection devices is configured to: and performing differential calculation according to the first current signal and the second current signal to generate a differential current, and generating a differential control signal when the differential current is within a differential protection preset range, wherein the differential control signal is used for disconnecting the line.
2. The 5G-based distributed new energy relay protection system according to claim 1, further comprising:
a first current transformer communicatively coupled to the first protection device, the first current transformer configured to detect the first current signal of the first transformer; and
and the second current transformer is in communication connection with the second protection device and is used for detecting the second current signal of the second transformer.
3. The 5G-based distributed new energy relay protection system according to claim 2, wherein the first client terminal device comprises:
the first data receiving module is in communication connection with the 5G base station;
the first data conversion module is in communication connection with the first protection device and the first data receiving module; and
a first time-alignment module, communicatively connected to the 5G base station and the first data conversion module;
wherein the second current signal passes through the second client terminal device, the 5G base station, the first data receiving module to the first data converting module;
the first time synchronization module synchronizes the second current signal with the first current signal, so that the first current signal and the second current signal are current signals of the first transformer and the second transformer at the same time.
4. The 5G-based distributed new energy relay protection system according to claim 2, wherein the first client terminal device comprises:
the second data receiving module is in communication connection with the 5G base station;
the second data conversion module is respectively in communication connection with the first protection device and the second data receiving module;
wherein, distributed new forms of energy relay protection system still includes:
a first time-tick device communicatively coupled to the first protection device and the 5G base station,
wherein the second current signal passes through the second client terminal device, the 5G base station, the second data receiving module, and the second data converting module to the first protection device;
the first time synchronization device performs time synchronization on the second current signal and the first current signal, so that the first current signal and the second current signal are current signals of the first transformer and the second transformer at the same time.
5. The 5G-based distributed new energy relay protection system according to claim 1, further comprising:
the first relay and the second relay are arranged on the circuit;
two ends of the first relay are respectively and electrically connected with the first transformer and the second relay, and two ends of the second relay are respectively and electrically connected with the second transformer and the first relay;
the first relay is in communicative connection with the first protection device, the second relay is in communicative connection with the second protection device,
wherein the first relay is opened under control of the differential control signal to disconnect the line; or
The second relay is opened under the control of the differential control signal to disconnect the line.
6. The 5G-based distributed new energy relay protection system according to claim 2, wherein the first client terminal device and the 5G base station transmit signals through a UDP/IP protocol;
and the second client terminal equipment and the 5G base station transmit signals through a UDP/IP protocol.
7. The 5G-based distributed new energy relay protection system according to claim 6, further comprising:
a first line electrical detector disposed on the line for detecting an electrical parameter on the line;
the first protection device includes:
the first fault detection unit is in communication connection with the first line electrical detector and is used for judging whether the line has a fault according to the electrical parameters;
the first differential protection unit is respectively in communication connection with the first fault detection unit and the first current transformer;
wherein the first differential protection unit is configured to: when the first fault detection unit judges that the line has a fault, a fault signal is generated, differential calculation is performed according to the first current signal and the second current signal to generate a differential current, and when the differential current is within a differential protection preset range, a differential control signal is generated and used for disconnecting the line.
8. The 5G-based distributed new energy relay protection system according to claim 7, wherein the first line electrical detector comprises: any one of a current abrupt change element, an overcurrent element, and a zero sequence element.
9. The 5G-based distributed new energy relay protection system according to claim 7, wherein the output voltage of the first transformer is greater than the output voltage of the second transformer, and the first differential protection unit is further configured to: and transmitting the fault signal to the second protection device, and transmitting the second current data to the first protection device by the second protection device through the second customer terminal equipment, the 5G base station and the first customer terminal equipment according to the fault signal.
10. The 5G-based distributed new energy relay protection system according to claim 1,
the first client terminal equipment is in communication connection with the first protection device through a serial port or a network cable;
and the second client terminal equipment is in communication connection with the second protection device by adopting a serial port or a network cable.
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| CN202211035498.6A CN115549036A (en) | 2022-08-26 | 2022-08-26 | Distributed new energy relay protection system based on 5G |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN116995625A (en) * | 2023-08-08 | 2023-11-03 | 国网重庆市电力公司 | Power distribution network differential protection method and system based on regional ad hoc network communication |
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2022
- 2022-08-26 CN CN202211035498.6A patent/CN115549036A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN116995625A (en) * | 2023-08-08 | 2023-11-03 | 国网重庆市电力公司 | Power distribution network differential protection method and system based on regional ad hoc network communication |
| CN116995625B (en) * | 2023-08-08 | 2024-01-30 | 国网重庆市电力公司 | Power distribution network differential protection method and system based on regional ad hoc network communication |
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