A method, device and system for information transmission in a PLC network

Abstract

The embodiment of the application discloses a method, device and system for information transmission in a PLC network, which are used for transmitting information. The switch control device comprises a switch and a coupling circuit, the coupling circuit is connected in parallel with the switch, and when the switch is turned off, the coupling circuit transmits a first power line communication (PLC) signal to a gateway device. The embodiment of the application also provides a method for information transmission. The embodiment of the application can send a PLC signal to the gateway device when the switch is turned off, and report information such as power failure and tripping to the gateway device.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of communication, and in particular to a method, device and system for information transmission in a power line communication (PLC) network. BACKGROUND

[0002] With the deepening of market-oriented reform of the power industry and the rapid development of power Internet of Things, the State Grid is currently widely constructing power Internet of Things. In the power distribution field, low-voltage device active reporting of power outage event information has become an important goal widely applied in the construction of power Internet of Things of the State Grid. For a long time, the power outage event is sensed by the low-voltage device and reported by the low-voltage device, which can help the power supply department to obtain the power outage information before the user reports, and analyze the fault point and restore power supply by using the edge computing data analysis capability, thereby improving the efficiency of operation and maintenance of the State Grid. In addition, the low-voltage device has been intelligently transformed, and the communication mode of the low-voltage device can be power line communication (PLC), micro-power radio frequency (RF), or dual-mode communication combining PLC and RF, so all switches in the local communication domain of the power distribution network are equipped with a communication module.

[0003] At present, one of the power outage event information transmission methods in the prior art uses power outage reporting technology in the case of power outage. The specific principle diagram can be referred to as shown in Figure 1 When the switch A1 is tripped due to overcurrent or leakage of the user, the electric meter located below the A1 switch will be powered off, and Figure 1 The electric meter is provided with a PLC communication module, that is, all electric meters affected by the tripping of the A1 switch will report the power outage event information to the gateway through the PLC communication module, and then the gateway determines the power outage area and the fault point position according to the reported power outage event information.

[0004] However, the power outage event information reporting method in the prior art has the following defects: when the user load short circuit or overload causes the A1 switch to break, other switch devices on the same line as A1, such as B1 and C1, if the break occurs, the generated power outage event information cannot be transmitted to the gateway, so that the electric meter cannot report the power outage event information corresponding to B1 and C1 to the gateway through the PLC communication mode. SUMMARY

[0005] The present application provides a method, device and system for information transmission in a PLC network, which can also send a PLC signal to the gateway device when the switch is opened, and report power outage, tripping and other information to the gateway device.

[0006] In a first aspect, the present application provides a switch control device, comprising: a switch and a coupling circuit, wherein the coupling circuit is connected in parallel to both ends of the switch, and is configured to transmit a first PLC signal to a gateway device when the switch is disconnected.

[0007] When the switch is disconnected, it may be because the switch control device has experienced an event such as a trip or power outage. In this case, the switch control device can transmit the first PLC signal sent by the PLC module of the connected meter or other device to the gateway device through the coupling circuit. The first PLC signal can include information such as the trip, power outage, and fault, as well as meter data, logs, and other information.

[0008] In combination with the first aspect, in a first implementation manner of the first aspect, the switch is configured to transmit a second PLC signal to the gateway device when closed.

[0009] When the switch is closed, there are two possibilities: One possibility is that the meters and devices in the PLC network are operating normally, and the second PLC signal is transmitted normally to the gateway device through the switch. In this case, the second PLC signal generally carries information such as meter data and logs. Another possibility is that the meter or other device connected to the switch control device has experienced an event such as a power outage or trip. The second PLC signal includes information such as the trip, power outage, or fault, and may also include information such as meter data and logs.

[0010] The switch control device provided in the present application can send PLC signals to the gateway device through different transmission channels when the switch is open or closed by setting a coupling circuit in parallel with the switch, so as to transmit various information carried by the PLC signal and improve the reliability of PLC network communication.

[0011] In combination with the first aspect or the first implementation of the first aspect, in the second implementation of the first aspect, the switch control device further includes a PLC module, the PLC module being connected in parallel with one end of the coupling circuit and the PLC module being connected in parallel with one end of the switch. The PLC module is configured to send a third PLC signal to the gateway device.

[0012] When a switch control device includes a PLC module, it possesses PLC communication capabilities. If a fault, power outage, or trip occurs, the switch control device can promptly send a third PLC signal to the gateway device, improving communication efficiency. This third PLC signal can include information such as switch status, tripping, power outage, and fault information.

[0013] In combination with the first aspect and any one of the first and second implementations of the first aspect, in the third implementation of the first aspect, the coupling circuit includes a signal transformer and at least 6 safety capacitors, the at least 6 safety capacitors are used to select PLC signals of a specific frequency band, and the signal transformer is used to couple the selected PLC signals.

[0014] When the switch in the switch control device is disconnected, the at least 6 safety capacitors can select a PLC signal in a specific frequency band. However, a higher surge voltage will be generated when the switch is disconnected. Therefore, by coupling the selected PLC signal through a signal transformer, the voltage resistance of the coupling circuit can be improved, thereby improving the reliability of the coupling circuit.

[0015] In a second aspect, the present application provides an information transmission method, which is applied to a first switch control device. The first switch control device includes a switch and a coupling circuit. The coupling circuit is connected in parallel with both ends of the switch, including:

[0016] When the switch is opened, the first PLC signal is transmitted to the gateway device through the coupling circuit.

[0017] In combination with the second aspect, in a first implementation manner of the second aspect, when the switch is closed, the second PLC signal is transmitted to the gateway device through the switch.

[0018] When the switch is disconnected, it may be because the first switch control device has experienced an event such as a trip or power outage. In this case, the first switch control device can transmit the first PLC signal sent by the PLC module of the connected meter or other device to the gateway device through the coupling circuit. The first PLC signal may include information such as tripping, power outage, and fault, as well as meter data, logs, and other information.

[0019] When the switch is closed, there are two possibilities: One possibility is that the meters and devices in the PLC network are operating normally, and the second PLC signal is transmitted normally to the gateway device through the switch. In this case, the second PLC signal generally carries information such as meter data and logs. Another possibility is that the meter or other device connected to the switch control device has experienced an event such as a power outage or trip. The second PLC signal includes information such as the trip, power outage, or fault, and may also include information such as meter data and logs.

[0020] The information transmission method provided in this application can send PLC signals to the gateway device through different transmission channels when the switch is open or closed, so as to transmit various information carried by the PLC signal and improve the reliability of PLC network communication.

[0021] In a second implementation of the first aspect, the second switch control device comprises a PLC module, the PLC module is connected in parallel with one end of the coupling circuit, and the PLC module is connected in parallel with one end of the switch. The method further comprises:

[0022] The third PLC signal is sent to the gateway device through the PLC module, and the third PLC signal comprises the first address identifier corresponding to the first switch control device.

[0023] After the switch control device comprises the PLC module, the switch control device has the PLC communication function. Once the switch control device fails, is powered off or is tripped, the switch control device can timely send the third PLC signal to the gateway device, and the communication efficiency is improved. At this time, the third PLC signal can comprise the switch state, the tripping, the power-off, the failure and the like.

[0024] In a third implementation of the second aspect, the first broadcast message broadcasted by the second switch control device can be received, the first broadcast message comprises the power-off information, and then the reporting message carrying the second address identifier corresponding to the second switch control device is unicast to the gateway device. When the confirmation message replied by the gateway device is received, the first reply message is broadcasted, the confirmation message carries the second address identifier, and the first reply message carries the second address identifier.

[0025] The first broadcast message broadcasted by the second switch control device is received, the first broadcast message comprises the power-off information, and then the reporting message carrying the second address identifier is unicast to the gateway device. The first reply message is broadcasted by the second switch control device through the confirmation message replied by the gateway device, so that at least one switch control device can determine whether the first broadcast message comprising the power-off information needs to be continuously broadcasted according to the first reply message, the same power-off information is prevented from being repeatedly reported, the bandwidth resource is saved, and the information transmission efficiency is improved.

[0026] In a fourth implementation of the second aspect, when the switch is turned off, the second broadcast message is broadcasted, the second broadcast message comprises the first address identifier, and then the second reply message broadcasted by the third switch control device is received. If the second address identifier is not present in the second reply message, the second broadcast message is not broadcasted, and if the second address identifier is present in the second reply message, the second broadcast message is broadcasted.

[0027] When the switch in the switch control device is off, the second broadcast message can be broadcasted to the gateway device, and the second reply message is received, and then it is judged whether the second broadcast message needs to be continuously sent through the second reply message, the same information is reduced to be repeatedly reported, the bandwidth resource is saved, and the information transmission efficiency is improved.

[0028] With reference to the fourth implementation manner of the second aspect, in a fifth implementation manner of the second aspect, after receiving the second reply message broadcasted by the third switch control device, the information transmission method further includes:

[0029] The third broadcast message sent by the third switch control device is first received, and the third broadcast message includes a third address identifier corresponding to the third switch control device, if the third address identifier exists in the received second reply message, the third PLC signal is not sent, and if the third address identifier does not exist in the received second reply message, the third PLC signal is broadcasted.

[0030] The switch control device can determine whether the third PLC signal needs to be sent by judging whether the second reply message includes the third address identifier corresponding to the third switch control device, the same information is reduced to be repeatedly reported, the bandwidth resource is saved, and the information transmission efficiency is improved.

[0031] In a third aspect, the application provides a power distribution network system, including:

[0032] The user meter box, the branch box, the power distribution cabinet, the gateway device and the power transformer, and the power transformer is used for providing power supply;

[0033] The user meter box includes the switch control device and the electric meter in any one of the first aspect to the third implementation manner of the first aspect.

[0034] The branch box includes the switch control device in any one of the first aspect to the third implementation manner of the first aspect.

[0035] The power distribution cabinet includes the switch control device in any one of the first aspect to the third implementation manner of the first aspect.

[0036] In the switch control device provided by the application, when the switch is in the off state, the first PLC signal is transmitted to the gateway device through the coupling circuit in the switch control device, and when the switch in the switch control device is in the closed state, the second PLC signal is transmitted to the gateway device through the switch in the switch control device, wherein the PLC signal carries data information, so that the data information can be transmitted when the switch is in different states.

[0037] In addition, in the power distribution network system of the present application, when the power distribution network system fails, i.e. the switch is opened, the first PLC signal carrying information of power failure, tripping or fault can be transmitted through the coupling circuit in the switch control device, so that the first PLC signal can be sent to the gateway device through the PLC mode, thereby improving the reliability of information transmission. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 Fig. 1 is a schematic diagram of the architecture of the power distribution network system in the prior art;

[0039] Figure 2 Fig. 2 is a schematic diagram of one structure of the switch control device in the embodiment of the present application;

[0040] Figure 3 Fig. 3 is a schematic diagram of another structure of the switch control device in the embodiment of the present application;

[0041] Figure 4 Fig. 4 is a schematic diagram of another structure of the switch control device in the embodiment of the present application;

[0042] Figure 5 Fig. 5 is a schematic diagram of the structure of the coupling circuit in the switch control device in the embodiment of the present application;

[0043] Figure 6 Fig. 6 is a schematic diagram of the flow direction of the PLC signal in the switch control device in the embodiment of the present application;

[0044] Figure 7 Fig. 7 is a schematic diagram of one architecture of the power distribution network system in the embodiment of the present application;

[0045] Figure 8 Fig. 8 is a schematic diagram of the flow of the method of information transmission in the embodiment of the present application;

[0046] Figure 9 Fig. 9 is another schematic diagram of the architecture of the power distribution network system in the embodiment of the present application;

[0047] Figure 10 Fig. 10 is a node communication flow chart of the method of information transmission in the embodiment of the present application. DETAILED DESCRIPTION

[0048] The embodiment of the present application provides a method of information transmission, a switch control device and a related system, which are used for sending a first PLC signal to a gateway device when a switch is opened, and transmitting data information carried by the first PLC signal.

[0049] The switch control device provided by the embodiment of the present application is described below, please refer to Figure 2 , Figure 2This is a schematic diagram of the structure of a switch control device in an embodiment of the present application. The switch control device 200 in the embodiment of the present application includes:

[0050] Switch 201 and coupling circuit 202;

[0051] The coupling circuit 202 is connected in parallel with both ends of the switch 201;

[0052] The switch 201 is configured to transmit a first power line communication (PLC) signal to the gateway device when the switch 201 is closed.

[0053] The coupling circuit 202 is configured to transmit a second PLC signal to the gateway device when the switch 201 is disconnected.

[0054] In the embodiment of the present application, the coupling circuit is a PLC coupling circuit. It should be noted that in actual applications, other names may be used to replace coupling circuits that perform the same function, and this embodiment of the present application does not limit this. Secondly, the gateway device can be an intelligent transformer terminal unit (TTU) or a data concentrator unit (DCU).

[0055] It is understandable that in actual applications, when the switch 201 is disconnected, it is often because the switch trips due to overcurrent or leakage. Although the switch does not trip, the line is out of power. The disconnected state is a state in which the switch cannot pass current or data information, which is not limited in the embodiments of the present application.

[0056] Furthermore, when the switch is closed, there are two possibilities: one possibility is that the meters and devices in the PLC network are operating normally, and the second PLC signal is transmitted normally to the gateway device through the switch. In this case, the second PLC signal generally carries information such as meter data and logs. Another possibility is that the meter or other device connected to the switch control device has experienced an event such as a power outage or trip. The second PLC signal includes information such as the trip, power outage, or fault, and may also include information such as meter data and logs.

[0057] In an embodiment of the present application, when the switch in the switch control device is disconnected, the PLC signal can be transmitted to the gateway device through the transmission channel constructed by the coupling circuit. In addition, the coupling circuit occupies a small volume, has a low integration cost, and can also improve the reliability of the power supply system.

[0058] Optionally, Figure 3 This is another structural diagram of a switch control device in an embodiment of the present application. The switch control device 300 in the embodiment of the present application includes:

[0059] Switch 301, coupling circuit 302 and PLC module 303;

[0060] The coupling circuit 302 is connected in parallel with both ends of the switch 301;

[0061] The PLC module 303 is connected in parallel with one end of the coupling circuit 302, and the PLC module is connected in parallel with the incoming line end of the switch 301;

[0062] The switch 301 is configured to transmit a first PLC signal to the gateway device when closed;

[0063] The coupling circuit 302 is configured to transmit a second PLC signal to the gateway device when the switch 301 is disconnected;

[0064] The PLC module 303 is configured to send a third PLC signal to the gateway device, where the third PLC signal includes a first address identifier corresponding to the first switch control device.

[0065] Specifically, see Figure 4 , Figure 4 This is another structural diagram of the switch control device in the embodiment of the present application. A1, A2, B1, B2, C1, and C2 are phase lines, and N is the live line. When the switch is closed, the PLC signal is transmitted from A1, B1, and C1 through the switch to A2, B2, and C2. When the switch is open, the PLC signal is transmitted from A1, B1, and C1 through the coupling circuit to A2, B2, and C2. Secondly, since it includes a power carrier communication module, that is, the switch control device has a PLC communication function, the third PLC signal can be sent directly to the gateway device through the power carrier communication module when the switch is closed or open. It can be understood that Figure 4 The example shows a scenario where the PLC module is connected in parallel with the input terminal of the switch. In actual applications, the PLC module can also be connected in parallel with the output terminal of the switch.

[0066] In an embodiment of the present application, after the switch control device includes a PLC module, that is, the switch control device has a PLC communication function, the switch control device can directly report power outage information to the gateway device without waiting for the electric meter to report the power outage information to the gateway device, which can improve the fault feedback speed. At this time, the third PLC signal can include information such as switch status, tripping, power outage, and fault.

[0067] Optionally, the coupling circuit 202 specifically includes a signal transformer and at least 6 safety capacitors;

[0068] At least 6 safety capacitors are used to select PLC signals in a specific frequency band;

[0069] Signal transformers are used to couple PLC signals.

[0070] Specifically, see Figure 5 , Figure 5FIG. 1 is a schematic diagram of the structure of the coupling circuit in the switch control device in the embodiment of the present application. Figure 6 As shown, the switch control device provided by the present application is described by taking the coupling circuit including 8 safety capacitors and 2 signal transformers as an example. Among them, C1 to C8 are safety capacitors, T1 is the first signal transformer, T2 is the second signal transformer, A1, A2, B1, B2, C1, C2 are phase wires, and N is the live wire. It can be understood that, Figure 5 The switch in the example is a four-pole switch, but in actual applications, a three-pole switch can also be used. The connection method is similar to that of the four-pole switch and will not be described in detail here. Specifically, the three-pole switch can operate on unloaded lines within a certain range, while the four-pole switch can improve electrical safety during electrical maintenance. Therefore, the switches in the switch control device can be of different types in different application scenarios, thereby improving the flexibility and selectivity of this solution.

[0071] Furthermore, a coupling circuit is connected in parallel with the switch, with safety capacitor C1 connected to phase line C1, safety capacitor C2 connected to phase line B1, safety capacitor C3 connected to phase line A1, safety capacitor C4 connected to phase line C2, safety capacitor C5 connected to phase line B2, safety capacitor C6 connected to phase line A2, safety capacitors C7 and C8 connected to both ends of the first signal transformer T1 and the second signal transformer T2, and N connected to the neutral copper busbar or cable. When the switch contacts in the switch control device are closed, that is, when the switch is in the closed state, the coupling circuit is short-circuited across the terminals, and the PLC signal is transmitted through the switch in the switch control device. However, when the switch contacts in the switch control device are open, that is, when the switch is in the open state, safety capacitors C1 to C3 select the PLC signal in a specific frequency band and isolate other signals, which may be industrial frequency AC signals or other low-frequency signals. When the switch is disconnected, a higher surge voltage will be generated at the input and output ends of the coupling circuit. At this time, the first signal transformer and the second signal transformer in the coupling circuit will couple the PLC signal, thereby improving the voltage resistance of the input and output ends when disconnected, improving the reliability of the coupling circuit, and thus improving the reliability and feasibility of this embodiment.

[0072] Further, see Figure 6 , Figure 6 Schematic diagram of the flow of PLC signals in the switch control device in the embodiment of the present application, as shown in FIG. Figure 6As shown, when the switch is closed, the PLC signal from the incoming line passes through the safety capacitors C1-C3 to the primary side of the first signal transformer T1, i.e. the right coil of the first signal transformer T1, and then passes through the safety capacitors C7 and C8 to the secondary side of the second signal transformer T2, i.e. the right coil of the second signal transformer T2, and is transmitted to the outgoing line through the safety capacitors C4-C6, thus completing the transmission of the PLC signal from the incoming line to the outgoing line. It can be understood that the reverse PLC signal can also be transmitted from the outgoing line to the incoming line through a similar flow, which will not be described here in detail.

[0073] When the switch in the switch control device is closed, the safety capacitors can transmit the PLC signal of a specific frequency band through the coupling circuit, and a higher surge voltage will be generated when the switch is opened. The transformer can couple the PLC signal to improve the voltage resistance of the coupling circuit, thereby improving the reliability of the coupling circuit.

[0074] The switch control device in the embodiment of the present application is described above, and the power distribution network system in the embodiment of the present application is described below. For details, please refer to Figure 7 , Figure 7 Fig. 8 is a schematic diagram of an architecture of a power distribution network system in an embodiment of the present application. The power distribution network system includes a user meter box, a branch box, a power distribution cabinet, a gateway device, and a power transformer, and the power transformer is used to provide power supply.

[0075] The user meter box includes the aforementioned switch control device 200 and a power meter.

[0076] The branch box includes the aforementioned switch control device 200.

[0077] The power distribution cabinet includes the aforementioned switch control device 200.

[0078] For ease of understanding, please refer to Fig. 8, Figure 8 Fig. 9 is a flowchart of a method of information transmission in the power distribution network system shown in Fig. 8. Specifically, Figure 8 Fig. 9 is a method of information transmission based on Figure 7 As shown in Fig. 9, the method includes the following steps:

[0079] 801. When the switch in the switch control device is closed, the second PLC signal is transmitted to the gateway device through the switch.

[0080] 802. When the switch in the switch control device is opened, the first PLC signal is transmitted to the gateway device through the coupling circuit in the switch control device.

[0081] In an embodiment of the present application, when the switch is open, the first PLC signal is transmitted to the gateway device through the coupling circuit, and when the switch is closed, the second PLC signal is transmitted to the gateway device through the switch.

[0082] For example, Figure 7 In the power distribution network system shown, if the switch A1 in the distribution box is in the disconnected state, the switch B1 in the branch box is in the disconnected state, and the switch C1 in the user meter box is also in the disconnected state, the meter on the line will be powered off and a first information will be generated, where the first information may include meter data, power outage event information, tripping event information, abnormal event information, user data, message type and address information, where the address information includes the address information corresponding to switch A1, switch B1 and switch C1. Since switches A1, B1 and C1 are in the disconnected state, the first information generated by the electric meter cannot be transmitted through switches A1, B1 and C1. Therefore, when the electric meter detects a power outage, it will first randomly delay for a period of time and then detect the channel occupancy status. If the channel is occupied, that is, it is in a non-idle state, it will randomly delay for a period of time and detect the signal occupancy status again. If the channel is idle, the first PLC signal will be transmitted to the branch box through the coupling circuit in the user meter box, and then the coupling circuit in the branch box will transmit the first PLC signal to the distribution cabinet. Further, the coupling circuit in the distribution cabinet will transmit the first PLC signal to the gateway device, thereby completing the reporting of the first information, wherein the first PLC signal includes the first information.

[0083] For example, Figure 7 In the power distribution network system shown, if the switch A1 in the distribution box is in the closed state, the switch B1 in the branch box is in the open state, and the switch C1 in the user meter box is in the closed state, the meter on the line will be powered off and generate second information. At this time, the second information may include meter data, power outage event information, tripping event information, abnormal event information, user data, message type and address information, where the address information includes the address information corresponding to switch B1. Since switch B1 is in the open state, the first information generated by the meter cannot be transmitted through switch B1, so the second PLC signal will be transmitted to the branch box through the switch in the user meter box, and then the coupling circuit in the branch box will transmit the second PLC signal to the distribution cabinet. Furthermore, the switch in the distribution cabinet transmits the second PLC signal to the gateway device, thereby completing the reporting of the second information, where the second PLC signal includes the second information.

[0084] In an embodiment of the present application, the switch control device transmits information included in the PLC signal to the gateway device through different transmission channels when the switch is in different states, thereby improving the reliability and feasibility of the present application.

[0085] Secondly, please refer toFigure 9 , Figure 9 This is another schematic diagram of the architecture of the power distribution network system in an embodiment of the present application. The power distribution network system includes a user meter box, a branch box, a distribution cabinet, a gateway device, and a power transformer. The power transformer is used to provide power supply;

[0086] The user meter box includes the aforementioned switch control device 300 and an electric meter;

[0087] The branch box includes the aforementioned switch control device 300;

[0088] The power distribution cabinet includes the aforementioned switch control device 300 .

[0089] For ease of understanding, the following is an introduction based on Figure 9 The method for information transmission in the power distribution network system is shown.

[0090] In the embodiment of the present application, the third PLC signal can be directly sent to the gateway device through the PLC module in the switch control device, and the third PLC signal includes the first address identifier corresponding to the first switch control device.

[0091] For example, Figure 9 In the power distribution network system shown, if switch A2 is open, switch B2 in the branch box is closed, and switch C2 in the user meter box is closed, the meter on that line will lose power, generating a first message. This first message is similar to the above and will not be repeated here. Switch A2 will then generate a second message. Specifically, the second message is data generated by the switch control device when the switch in the switch control device is open. The second message may include power outage event information, trip event information, abnormal event information, or message type. After generating the second message, a third PLC signal is directly sent to the gateway device via the PLC module.

[0092] In an embodiment of the present application, after the switch control device includes a PLC module, that is, the switch control device has a PLC communication function, the third PLC signal can be directly sent from the switch control device to the gateway device, saving multiple transmission information resources, thereby improving transmission efficiency. In addition, for the switch in the switch control device, for a period of time after the switch is in the disconnected state, due to the presence of a backup power unit in the PLC module, the switch can still maintain a working state for a certain period of time after being disconnected, thereby improving the reliability and feasibility of the present application.

[0093] Optionally, sending the third PLC signal to the gateway device through the PLC module in the switch control device may further include:

[0094] receiving a first broadcast message sent by the second switch control device, wherein the first broadcast message includes power outage information;

[0095] Unicasting a report message to the gateway device, wherein the report message carries the second address identifier corresponding to the second switch control device;

[0096] When a confirmation message is received from the gateway device, a first reply message is broadcasted, wherein the confirmation message carries the second address identifier and the first reply message carries the second address identifier.

[0097] For example, see Figure 9 ,Will Figure 9 The switch control device including the power carrier communication module in the distribution network system shown is used as a node. When the switch in the switch control device is in a closed state, the node is a non-power-off node, and when the switch in the switch control device is in an open state, the node is a power-off node.

[0098] Specifically, see Figure 10 , Figure 10 This is a node communication flow chart of the information transmission method in the embodiment of the present application, and Figure 10 10A to 10F in the figure is a node, where 10A and 10B are nodes that are not powered off, and 10C to 10F are nodes that are powered off. It should be noted that the information transmission between nodes is not divided by geographical location. In the embodiment of this application, the signal strength is used for division, i.e. Figure 10 When the non-power-off node 10A is a gateway device, the non-power-off node 10B can be a switch control device within a specific signal strength range of the gateway device, see Figure 9 It can be seen that the node 10B that is not powered off can be the switch control device where the switch A1 exists, or the switch control device where the switch B1 exists, and the division of upper and lower levels of transmission between specific nodes is not limited here.

[0099] Further, taking the unpowered node 10A as an example, it can be known from the foregoing that the unpowered node 10B is in a closed state of the switch in the switch control device, and the unpowered node 10B can receive the first broadcast message sent by any one of the powered-off nodes 10C or 10D. The first broadcast message can be a user datagram protocol (UDP) packet and an internet protocol (IP) packet, and therefore the first broadcast message includes a link layer header, an IPv6 (internet protocol version 6) header, a UDP header, a powered-off reporting message payload, and a link layer frame check. The IPv6 header further includes a source IPv6 address, a destination IPv6 address, and other fields of the IPv6 header. For the unpowered node 10B, the source IPv6 address is any one of the corresponding addresses of the powered-off nodes 10C or 10D, and the destination IPv6 address is a broadcast address FF02::1. Different PLC technologies correspond to different link layer header formats. The link layer header format can be an IPv6 address corresponding link layer message authentication code (MAC) address, or a powered-off node short address bitmap. When the node is connected to the network, the gateway device allocates a short address, for example, a terminal identity document (TEI), to each node. The TEI is usually 12 bits, and the link layer header can use the TEI corresponding to the unpowered node 10B and the TEI corresponding to the unpowered node 10A to send the reporting message. The powered-off reporting message payload can include a message type, a sequence number, a starting short address, and a powered-off node short address bitmap. In the embodiment of the application, the message type of the reporting message is powered-off reporting, the starting short address is the minimum value of the short address of the reporting node, the sequence number is used to indicate the sequence number of the message, and the first broadcast message received by the unpowered node 10B each time should carry a different sequence number. Because the first broadcast message can be forwarded multiple times, a different sequence number is carried to facilitate other nodes to remove duplicate messages after repeatedly receiving the message. The powered-off node short address bitmap is a bitmap starting from the address corresponding to any one of the powered-off nodes 10C or 10D. According to the short address of the different powered-off nodes, the corresponding bits in the bitmap are set to “1”. For example, the maximum networking scale of the current HPLC is 1024, that is, a total of 128 bytes, or 1024 bits, can be used to represent 1024 nodes.

[0100] Further, the non-power failure node 10B aggregates the second address identifier in the first broadcast message, which can be aggregated by bitmap first address identifier or directly stacked aggregation. It should be noted that the embodiment of the present application is exemplified by bitmap, and the aggregation of the address identifier is not limited in actual application.

[0101] Specifically, the non-power failure node 10B can then send a report message to the non-power failure node 10A, which can include a link layer header, an IPv6 header, a UDP header, a power failure report message payload, and a link layer frame check. The IPv6 header further includes a source IPv6 address, a destination IPv6 address, and other fields of the IPv6 header. For the non-power failure node 10B, the source IPv6 address is the address corresponding to the non-power failure node 10B, and the destination IPv6 address is the address corresponding to the non-power failure node 10A. The link layer header can use the TEI corresponding to the non-power failure node 10B and the TEI corresponding to the non-power failure node 10A to send the report message. The power failure report message payload can include a message type, a sequence number, a starting short address, and a power failure node short address bitmap. In the embodiment of the present application, the message type of the report message is power failure report, the starting short address is the minimum value of the short address of the reporting node, and the sequence number is used to indicate the sequence number of the message.

[0102] Further, when the non-power failure node 10B receives the reply message of the non-power failure node 10A, it will send a first reply message to any of the power failure nodes 10C or 10D. Specifically, the reply message includes a link layer header, an IPv6 header, a UDP header, a power failure report message payload, and a link layer frame check. The IPv6 header further includes a source IPv6 address, a destination IPv6 address, and other fields of the IPv6 header. For the non-power failure node 10A, the source IPv6 address is the address corresponding to the non-power failure node 10A, and the destination IPv6 address is the address corresponding to the non-power failure node 10B. The power failure report message payload can include a message type, a sequence number, a starting short address, and a power failure node short address bitmap. The message type of the reply message is power failure confirmation. The first reply message includes a link layer header, an IPv6 header, a UDP header, a power failure report message payload, and a link layer frame check. The IPv6 header further includes a source IPv6 address, a destination IPv6 address, and other fields of the IPv6 header. For the non-power failure node 10A, the source IPv6 address is the address corresponding to the non-power failure node 10B, and the destination IPv6 address is the broadcast address FF02::1. The power failure report message payload can include a message type, a sequence number, a starting short address, and a power failure node short address bitmap. The message type of the first reply message is power failure confirmation.

[0103] In an embodiment of the present application, when the switch in the switch control device is closed, it can receive a second broadcast message sent by at least one switch control device, and send a report message carrying the first address identifier corresponding to the second broadcast message to the gateway device, and then send a first reply message carrying at least one first address identifier to at least one switch control device through a confirmation message sent by the gateway, so that at least one switch control device can determine whether to continue to send the second broadcast message based on the first reply message, thereby reducing repeated reporting of the same information, saving bandwidth resources, and improving information transmission efficiency.

[0104] Optionally, sending the third PLC signal to the gateway device through the PLC module in the switch control device may further include:

[0105] When the switch is disconnected, a second broadcast message is broadcasted, where the second broadcast message includes a first address identifier corresponding to the first switch control device;

[0106] receiving a second reply message broadcasted by the third switch control device;

[0107] If the second address identifier exists in the second reply message, the second broadcast message is not sent;

[0108] If the second reply information does not contain the second address identifier corresponding to the second information, the second broadcast message is broadcasted.

[0109] For example, see Figure 10 , taking the non-power-out node 10A as a gateway device as an example, it can be seen from the above that the power-out node 10C is the switch in the switch control device in the disconnected state, and then the power-out node 10C can send a second broadcast message to the non-power-out node 10B. The second broadcast message includes a link layer header, an IPv6 header, a UDP header, a power outage reporting message payload and a link layer frame check, wherein the IPv6 header also includes a source IPv6 address, a destination IPv6 address and other fields of the IPv6 header. For the power-out node 10C, the source IPv6 address is the address corresponding to the power-out node 10C, and the destination IPv6 address is the broadcast address FF02::1, and the power-outage reporting message payload can include a message type, a sequence number, a starting short address and a power-outage node short address bitmap. In the embodiment of the present application, the message type of the second broadcast message is a power outage report, and the others are similar to the above and will not be repeated here.

[0110] Further, when the non-power-off node 10B receives the confirmation message sent by the non-power-off node 10A, the non-power-off node 10B sends a second reply message to either the power-off node 10C or the power-off node 10D. After the power-off node 10C receives the second reply message, the power-off node 10C can determine whether the second address identifier exists in the power-off node short address bitmap in the second reply message according to the second reply message. If the second address identifier exists, the power-off node 10C does not send a second broadcast message to the non-power-off node 10B. If the second address identifier does not exist, the power-off node 10C continues to send the second broadcast message to the non-power-off node 10B. The second reply message and the second broadcast message are similar to the above, and thus are not described herein.

[0111] In the embodiment of the present application, when the switch of the switch control device is turned off, the second broadcast information can be sent to at least one switch control device. After the at least one switch control device receives the confirmation message sent by the gateway device, the second reply message carrying at least one first address identifier sent by the at least one switch control device is received, and whether the address identifier corresponding to the data information has been successfully reported to the network device is confirmed through the second reply message, so as to reduce the repeated reporting of the same data information, save the bandwidth resource, and improve the information transmission efficiency.

[0112] Optionally, after receiving the second reply message broadcasted by the third switch control device, the method for information transmission in the embodiment of the present application can further include:

[0113] receiving a third broadcast message sent by the third switch control device, the third broadcast message including a third address identifier corresponding to the third switch control device;

[0114] If the third address identifier exists in the second reply message, the third PLC signal is not sent.

[0115] If the third address identifier does not exist in the second reply message, the third PLC signal is broadcasted.

[0116] Exemplarily, please refer to Figure 10Taking the non-power failure node 10A as an example, it can be known from the foregoing that the power failure nodes 10C to 10F are in the open state of the switch in the switch control device. When the power failure node 10C receives the third broadcast message sent by any one of the power failure nodes 10E or 10F, the third broadcast message carries a link layer header, an IPv6 header, a UDP header, a power failure reporting message payload and a link layer frame check, wherein the IPv6 header further includes a source IPv6 address, a destination IPv6 address and other fields of the IPv6 header. For the power failure node 10C, the source IPv6 address is the corresponding address of any one of the power failure nodes 10E or 10F, the destination IPv6 address is the broadcast address FF02::1, and the power failure reporting message payload can include a message type, a sequence number, a start short address and a power failure node short address bitmap. In the embodiment of the application, the message type of the third broadcast message is power failure reporting, and the others are similar to the foregoing and will not be described herein again.

[0117] Further, the power failure node 10C aggregates the third address identifiers of any one of the power failure nodes 10E or 10F through a bitmap. Since the second reply message sent by the non-power failure node 10B has been received, the power failure node 10C can determine whether the third address identifier of any one of the power failure nodes 10E or 10F exists in the power failure node short address bitmap in the second reply message according to the second reply message. If the third address identifier exists, the power failure node 10C does not send the third PLC signal to the non-power failure node 10B. If the third address identifier does not exist, the power failure node 10C sends the third PLC signal to the non-power failure node 10B. The reply message is similar to the foregoing and will not be described herein again.

[0118] In the embodiment of the application, when the switch control device receives the third broadcast message sent by the third switch control device, whether the third address identifier corresponding to the third switch control device exists in the second reply message is determined to determine whether the third PLC signal needs to be sent, so as to reduce repeated reporting of the same data information, save bandwidth resources and improve information transmission efficiency.

[0119] Those skilled in the art can clearly understand the specific working process of the system, device and unit described above for the convenience and brevity of description. The corresponding process in the foregoing method embodiment can be referred to, and will not be described herein again.

[0120] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other manners. For example, the described device embodiments are merely schematic. The division of the units is merely a logical function division. There can be another division manner for the actual implementation, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections between the units can be indirect couplings or communication connections through some interfaces, devices or units, and can be electrical, mechanical or in other forms.

[0121] The units described as separated components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purposes of the embodiments of the present application.

[0122] In addition, each functional unit in the embodiments of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be implemented in the form of hardware, or in the form of software functional units.

[0123] When the integrated unit is implemented in the form of software functional units and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on such an understanding, the technical solutions of the present application essentially, or the part that contributes to the prior art, or all or a part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the embodiments of the present application. The foregoing storage medium includes: U disk, mobile hard disk, read-only memory (ROM, read-only memory), random access memory (RAM, random access memory), magnetic disk or optical disk, and various other media that can store program codes.

Claims

1. A switch control device, characterized in that: The switch control device includes a switch, a coupling circuit, multiple phase lines at the incoming end, multiple phase lines at the outgoing end, a neutral line at the incoming end, and a neutral line at the outgoing end, and the coupling circuit is connected in parallel with both ends of the switch; The coupling circuit is configured to transmit a first PLC signal to the gateway device when the switch is disconnected; The coupling circuit includes a first signal transformer, a second signal transformer, and capacitors. The capacitors include a plurality of capacitors corresponding to the incoming end and a plurality of capacitors corresponding to the outgoing end. The capacitors corresponding to the incoming end correspond one-to-one with the phase lines of the incoming end. Each phase line of the incoming end is connected to one end of the first signal transformer via a corresponding capacitor corresponding to the incoming end. The neutral line of the incoming end is connected to the other end of the first signal transformer. The capacitors corresponding to the outgoing end correspond one-to-one with the phase lines of the outgoing end. Each phase line of the outgoing end is connected to one end of the second signal transformer via a corresponding capacitor corresponding to the outgoing end. The neutral line of the outgoing end is connected to the other end of the second signal transformer. The first signal transformer is connected to the second signal transformer. The switch is used to transmit a second PLC signal to the gateway device when closed.

2. The switch control device according to claim 1, characterized in that: The switch control device further includes a PLC module, the PLC module is connected in parallel with one end of the coupling circuit, and the PLC module is connected in parallel with one end of the switch; The PLC module is used to send a third PLC signal to the gateway device.

3. The switch control device according to any one of claims 1 to 2, characterized in that: The capacitors include at least 6 safety capacitors; The at least 6 safety capacitors are used to select a PLC signal of a specific frequency band; The first signal transformer and the second signal transformer are used to couple the selected PLC signal.

4. A method for information transmission, characterized in that: The method is applied to a first switch control device, the first switch control device comprising a switch, a coupling circuit, a plurality of phase lines at an incoming line end, a plurality of phase lines at an outgoing line end, a neutral line at the incoming line end, and a neutral line at the outgoing line end, wherein the coupling circuit is connected in parallel with both ends of the switch; When the switch is disconnected, transmitting a first PLC signal to the gateway device through the coupling circuit; The coupling circuit includes a first signal transformer, a second signal transformer, and capacitors. The capacitors include a plurality of capacitors corresponding to the incoming end and a plurality of capacitors corresponding to the outgoing end. The capacitors corresponding to the incoming end correspond one-to-one with the phase lines of the incoming end. Each phase line of the incoming end is connected to one end of the first signal transformer via a corresponding capacitor corresponding to the incoming end. The neutral line of the incoming end is connected to the other end of the first signal transformer. The capacitors corresponding to the outgoing end correspond one-to-one with the phase lines of the outgoing end. Each phase line of the outgoing end is connected to one end of the second signal transformer via a corresponding capacitor corresponding to the outgoing end. The neutral line of the outgoing end is connected to the other end of the second signal transformer. The first signal transformer is connected to the second signal transformer. When the switch is closed, a second PLC signal is transmitted to the gateway device through the switch.

5. The method according to claim 4, characterized in that The method is applied to a second switch control device, the second switch control device comprising a PLC module, the PLC module being connected in parallel with one end of the coupling circuit, and the PLC module being connected in parallel with one end of the switch; The method further comprises: A third PLC signal is sent to the gateway device through the PLC module, where the third PLC signal includes a first address identifier corresponding to the first switch control device.

6. The method according to claim 5, characterized in that The sending a third PLC signal to the gateway device through the PLC module includes: receiving a first broadcast message broadcasted by a second switch control device, wherein the first broadcast message includes power outage information; Unicasting a reporting message to the gateway device, wherein the reporting message carries a second address identifier corresponding to the second switch control device; When a confirmation message replied by the gateway device is received, a first reply message is broadcasted, wherein the confirmation message carries the second address identifier and the reply message carries the second address identifier.

7. The method according to claim 6, characterized in that The sending a third PLC signal to the gateway device through the PLC module includes: When the switch is disconnected, broadcasting a second broadcast message, wherein the second broadcast message includes the first address identifier; receiving a second reply message broadcasted by the third switch control device; If the second address identifier exists in the second reply message, the second broadcast message is not sent; If the second address identifier does not exist in the second reply message, the second broadcast message is broadcasted.

8. The method according to claim 7, characterized in that After receiving the second reply message broadcasted by the third switch control device, the method further includes: receiving a third broadcast message sent by a third switch control device, wherein the third broadcast message includes a third address identifier corresponding to the third switch control device; If the third address identifier exists in the second reply message, the third PLC signal is not sent; If the second reply message does not contain the third address identifier, the third PLC signal is broadcasted.

9. A power distribution network system, characterized in that: The power distribution network system includes a user meter box, a branch box, a distribution cabinet, a gateway device and a power transformer, and the power transformer is used to provide power supply; The user meter box comprises a switch control device and an electric meter as described in any one of claims 1 to 3 above; The branch box includes a switch control device as described in any one of claims 1 to 3 above; The power distribution cabinet includes the switch control device as described in any one of claims 1 to 3 above.

Images