Power failure reporting method for PLC (Programmable Logic Controller) and RF (Radio Frequency) dual-mode communication module

Abstract

The invention provides a power failure reporting method for a PLC (Programmable Logic Controller) and RF (Radio Frequency) dual-mode communication module. The power failure reporting method comprises the following steps: any node in power failure sends preset data in a broadcast form through an RF channel; the nodes without power failure judge whether forwarding is carried out or not according to CRC of a standard power failure event, and if the forwarding condition is met, the preset data are forwarded to a concentrator through a communication path in a unicast mode; the node in power failure judges whether to forward according to the CRC of the standard power failure event and the allowable forwarding times, if the forwarding condition is met, the preset data is forwarded in a broadcast form through an RF channel, and 1 is subtracted from the allowable forwarding times; and after the concentrator receives the preset data, the standard power failure event is extracted. According to the invention, any node in power failure sends the specific data through the RF channel in the form of broadcast, so that the node can complete more data sending under the condition of capacitor power supply, and the power failure caused by line faults can be handled.

Description

Technical Field

[0001] The invention relates to the field of smart electric meters, and specifically to improving the success rate of reporting power failure events of electric meters in the form of hybrid communication of PLC and RF. Background Art

[0002] Carrier communication has a wide coverage, is convenient and economical, and can realize data transmission and information exchange by using power lines. It is currently widely favored. Its specific advantages are as follows: (i) In carrier communication, power lines are not only power lines but also communication lines. Therefore, there is no need to set up communication media during use. The one-time construction cost is low, the investment is small, the effect is fast, and the operation and maintenance costs are relatively low. (ii) The line has high mechanical strength, strong ability to resist damage, and the reliability of transmission is trustworthy. (iii) The existing distribution lines can be used as communication channels, organized into a subnet with the substation as the center, and finally several subnets can form a complete data transmission network. Therefore, carrier communication networking is convenient and flexible. Its main disadvantages: (i) The pulse noise of power lines and power equipment will drown out useful carrier signals; (ii) When the load on the power line is heavy, it will cause great attenuation to the carrier signal.

[0003] Wireless communication is not affected by pulse noise and load size on the power line, but it also has obvious disadvantages: (a) the communication distance is limited; (b) the signal is easily blocked by obstacles.

[0004] Therefore, combining carrier communication with wireless communication, complementing each other's advantages, and ultimately forming a hybrid channel model can greatly improve the communication success rate of the network.

[0005] In a complex power grid topology, how to ensure that power outage event data can be reliably transmitted to the concentrator without excessively occupying network resources has become a technical problem that needs to be solved urgently. Summary of the invention

[0006] The purpose of the present invention is to solve the problem of how the devices in the dual-mode network can reliably transmit the data of the power-off event to the concentrator when a power-off event occurs in the dual-mode network, and to propose a power-off reporting method using a PLC and RF dual-mode communication module. In the application of power-off reporting by the electric meter, more power-off reports can be completed by using wireless communication.

[0007] The technical solution of the present invention is:

[0008] The present invention provides a method for reporting power failure of a PLC and RF dual-mode communication module, comprising:

[0009] Step 1: Any node that loses power sends preset data in broadcast form through an RF channel, where the preset data includes the number of allowed forwarding times and a standard power-off event;

[0010] Step 2: After receiving the preset data, any node calculates the CRC value of the standard power-off event part in the preset data and records the CRC value;

[0011] If the receiving node is not powered off, determining whether to forward the data according to the CRC value, and if the forwarding condition is met, forwarding the preset data to the concentrator in unicast form through the communication path between the receiving node and the concentrator;

[0012] If the receiving node loses power, determine whether to forward the data according to the CRC of the standard power-off event and the allowed forwarding times. If the forwarding conditions are met, forward the preset data in the form of broadcast through the RF channel, and reduce the allowed forwarding times by 1.

[0013] Step 3: After receiving the preset data, the concentrator extracts the standard power-off event.

[0014] Furthermore, any node that loses power sends preset data in a broadcast form through an RF channel including:

[0015] Any node detects whether it is powered off; if the node is powered off, the preset data is generated and sent in a broadcast form through the RF channel.

[0016] Furthermore, the condition for a node that has not experienced power failure to determine whether to forward is that the CRC value of the standard power failure event is inconsistent with the CRC of the forwarded data recorded by the node.

[0017] Furthermore, the condition for the node that has experienced power failure to determine whether to forward is that the CRC of the standard power failure event is inconsistent with the CRC of the forwarded data recorded by the node, and the allowed forwarding number is not zero.

[0018] Further, step 2 to step 3 are repeatedly performed until the preset data is forwarded to the concentrator or the allowed forwarding times are reduced to 0.

[0019] Furthermore, after extracting the standard power-off event, the concentrator determines the identity information of the power-off node according to the content of the standard power-off event, records the occurrence time of the power-off event, and reports the relevant information of the power-off event to the master station system.

[0020] Furthermore, the master station system determines the powered-off nodes in the network according to the identity of the powered-off nodes and the occurrence time of the power-off event; and counts the number and distribution of the powered-off nodes in the network to obtain the power-off status of the network.

[0021] Beneficial effects of the present invention:

[0022] In the present invention, the power-off node sends and forwards data in the form of RF, which can enable the node to support a longer time when powered by a capacitor, thereby completing more data transmission; in the case of a line failure, the medium of PLC communication is equivalent to being destroyed and communication is impossible. Sending and forwarding data in the form of RF can effectively deal with power outages caused by line failures.

[0023] In the present invention, the nodes that are not powered off forward data in unicast form through the original communication path, which can avoid generating more broadcast data, thereby reducing the pressure on the network; when the power-off nodes forward data, they determine whether to forward by allowing the number of forwarding times, which can avoid excessive forwarding of data, thereby reducing the pressure on the network.

[0024] In the present invention, when forwarding data, all nodes determine whether to forward the data by using the CRC of the standard power-off event part, thereby avoiding forwarding repeated events and reducing the pressure on the network.

[0025] The method of the present invention combines broadcasting and unicasting, utilizes non-power-off nodes and power-off nodes to jointly participate in forwarding, and sets an allowed forwarding number limit for repeated forwarding, thereby ensuring reliable transmission of power-off event data and avoiding network congestion; improving the transmission efficiency and reliability of power system power-off event data, and facilitating timely grasp of the power grid operation status.

[0026] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0028] Figure 1 A schematic diagram of an application scenario of a method for reporting power failure using a PLC and RF dual-mode communication module according to an embodiment of the present invention is shown.

[0029] Figure 2 One of the schematic diagrams of broadcasting and sending data by an electric meter of a power-off node according to an embodiment of the present invention is shown.

[0030] Figure 3 One of the schematic diagrams of broadcasting and sending data by an electric meter of a power-off node according to an embodiment of the present invention is shown.

[0031] Figure 4A schematic diagram showing filtering of identical forwarding data by an electric meter according to an embodiment of the present invention is shown.

[0032] Figure 5 A schematic diagram showing an electric meter filtering data with an allowed forwarding number of 0 according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0033] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0034] The invention provides a power-off reporting method for a PLC and RF dual-mode communication module, which is used in a dual-mode network, and when a power-off event occurs, devices in the network send and forward data.

[0035] Any node that loses power will broadcast preset data through the RF channel, which includes the number of allowed forwarding times and the standard power-off event.

[0036] If other nodes that have not experienced power outages receive data from the power-off node, they need to calculate the CRC of the standard power-off event part of the current data and record it. If the forwarding conditions are met, the data is forwarded to the concentrator in unicast form through the current communication path between the concentrator and the concentrator.

[0037] If other nodes that have experienced power failure receive data from the power failure node, they need to calculate the CRC of the standard power failure event part in the current data and record it. If the forwarding conditions are met, the data is forwarded in the form of broadcast through the RF channel, and when forwarding, the number of forwarding times allowed in the forwarded data needs to be reduced by 1.

[0038] The condition for the non-power-off node to forward data is that the CRC calculated from the standard power-off event part of the current data is inconsistent with the CRC of the previously recorded and forwarded data.

[0039] The condition for the power-off node to forward data is that the CRC calculated from the standard power-off event part of the current data is inconsistent with the CRC of the previously recorded forwarded data, and the allowed forwarding times part of the current data is still not 0.

[0040] After receiving the data, the concentrator removes the allowed forwarding times and only retains the standard power-off event part.

[0041] When implementing:

[0042] Case 1, such as Figure 1 , when the power of meter M1 is lost. Figure 2, M1 sends data in the form of broadcast through the RF channel. The power meter M4 that has not experienced power failure receives the data from the power meter M1, and then M4 forwards the data to the DCU through the original communication path between it and the DCU.

[0043] Case 2, such as Figure 1 , when the power of meters M2 and M3 is lost. Figure 3 , M2 sends data in the form of broadcast through the RF channel. After receiving the data sent by M2, the power meter M3, which also experienced power failure, sends the data in the form of broadcast through the RF channel. Then the power meter M8, which did not experience power failure, receives the data forwarded by the power meter M3, and then M8 forwards the data to the DCU through the original communication path between it and the DCU.

[0044] Case 3, such as Figure 1 , when the power of meters M1, M2 and M3 is lost. Figure 4 , M1 sends data in the form of broadcast through the RF channel. M2 and M3 both receive the data sent by M1, so they both forward it. The data forwarded by M2 is received by M3 again. At this time, the data received by M3 is consistent with the data previously received from M1, so it gives up forwarding the data from M2.

[0045] Case 4, such as Figure 1 , when the power of meters M1, M2 and M3 is lost. Figure 5 , M1 sends data in the form of broadcast through the RF channel. M2 and M3 both receive the data sent by M1, so they both forward it. The data forwarded by M2 is received by M3 again. At this time, the allowed forwarding hop count in the data received by M3 is 0, so it gives up forwarding the data from M2.

[0046] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A method for reporting power failure of a PLC and RF dual-mode communication module, characterized in that: include: Step 1: Any node that loses power sends preset data in broadcast form through an RF channel, where the preset data includes the number of allowed forwarding times and a standard power-off event; Step 2: After receiving the preset data, any node calculates the CRC value of the standard power-off event part in the preset data and records the CRC value; If the receiving node is not powered off, determining whether to forward the data according to the CRC value, and if the forwarding condition is met, forwarding the preset data to the concentrator in unicast form through the communication path between the receiving node and the concentrator; If the receiving node loses power, determine whether to forward the data according to the CRC of the standard power-off event and the allowed forwarding times. If the forwarding conditions are met, forward the preset data in the form of broadcast through the RF channel, and reduce the allowed forwarding times by 1. Step 3: After receiving the preset data, the concentrator extracts the standard power-off event.

2. The method for reporting power failure of a PLC and RF dual-mode communication module according to claim 1, characterized in that: Any node that loses power sends preset data in broadcast form through the RF channel, including: Any node detects whether it is powered off; if the node is powered off, the preset data is generated and sent in a broadcast form through the RF channel.

3. The method for reporting power failure of a PLC and RF dual-mode communication module according to claim 1, characterized in that: The condition for a node that has not experienced power failure to determine whether to forward data is that the CRC value of the standard power failure event is inconsistent with the CRC of the forwarded data recorded by the node.

4. The method for reporting power failure of a PLC and RF dual-mode communication module according to claim 1, characterized in that: The condition for the node that has experienced power failure to determine whether to forward is that the CRC of the standard power failure event is inconsistent with the CRC of the forwarded data recorded by the node, and the allowed forwarding number is not 0.

5. The method for reporting power failure of a PLC and RF dual-mode communication module according to claim 1, characterized in that: Repeat steps 2 to 3 until the preset data is forwarded to the concentrator or the allowed forwarding times is reduced to 0.

6. The method for reporting power failure of a PLC and RF dual-mode communication module according to claim 1, characterized in that: After extracting the standard power-off event, the concentrator determines the identity information of the power-off node according to the content of the standard power-off event, records the occurrence time of the power-off event, and reports the relevant information of the power-off event to the master station system.

7. The method for reporting power failure of a PLC and RF dual-mode communication module according to claim 6, characterized in that: The master station system determines the power-off nodes in the network according to the identity identifiers of the power-off nodes and the occurrence time of the power-off event; and counts the number and distribution of the power-off nodes in the network to obtain the power-off status of the network.

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