Railway power line carrier relay system based on heterogeneous link

Abstract

The invention relates to a railway power carrier relay system based on a heterogeneous link, the system is based on a master-slave mode and comprises a power carrier device of a master mode node and power carrier devices of a plurality of slave mode nodes, the power carrier device of one slave mode node is a sink node, the system comprises two relay paths, and the relay paths are connected with the master mode node and the slave mode node. The power line carrier device of each slave mode node in each relay path sequentially transmits acquired data to the power line carrier device of the sink node, and the acquired data is transmitted to the power line carrier device of the master mode node after being converged by the power line carrier device of the sink node; the sink node is an mth slave mode node close to the master mode node end, wherein m is not equal to 1. Compared with the prior art, the method has the advantages that the real-time performance of data transmission and the transmission data quality are improved, and the transmission data volume of the system is expanded.

Description

Technical Field

[0001] The present invention relates to the technical field of power line carriers, and in particular to a railway power line carrier relay system based on heterogeneous links. Background Art

[0002] Existing power carrier devices are mainly used in railways, smart homes, remote meter reading systems, medical monitoring, industrial control, intelligent building management, agricultural monitoring, photovoltaic solar energy monitoring and other systems. There are generally problems such as low communication speed, short transmission distance, serial bus multi-node long-distance data cannot be uploaded, or poor data anti-interference ability during long-distance transmission. In the existing special application monitoring systems such as railways that are difficult to meet high real-time requirements, large data volume, long distance, strong interference, and multiple single-bus collection points. Poor communication quality and short transmission distance in railway systems have always been a problem.

[0003] After searching, China Invention Patent Publication No. CN110943761B discloses a long-distance power carrier device with relay. The power carrier device determines whether it is a relay node or an ordinary node according to the setting of the dial switch. If it is a relay node, the power carrier device forwards the received ordinary node power carrier data to be relayed to the next relay node or the final destination; if it is an ordinary node, the power carrier device sends the power carrier data to be sent to the target node address. This existing patent solves the problem of short transmission distance through relaying, but there is a problem of poor communication quality during long-distance transmission.

[0004] How to improve the communication quality of long-distance transmission under the railway power carrier relay mode has become a technical problem that needs to be solved. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a railway power carrier relay system based on heterogeneous links.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] According to one aspect of the present invention, a railway power carrier relay system based on heterogeneous links is provided. The system is based on a master-slave mode, including a power carrier device of a master mode node and a plurality of power carrier devices of slave mode nodes, wherein the power carrier device of one slave mode node is a convergence node, and the system includes two relay paths, wherein the power carrier devices of the slave mode nodes in each relay path sequentially transmit the collected data to the power carrier device of the convergence node, and the power carrier devices of the convergence node converge and transmit the collected data to the power carrier device of the master mode node;

[0008] The sink node is the mth slave mode node close to the master mode node end, where m≠1.

[0009] Preferably, the power carrier device of the master mode node is arranged indoors, that is, an indoor carrier host.

[0010] Preferably, the power carrier device of the slave mode node is arranged outdoors, that is, an outdoor data collection extension.

[0011] Preferably, the aggregation node is a third slave mode node or a fourth slave mode node.

[0012] Preferably, the power carrier device of the master mode node is responsible for the management of the entire power carrier relay system and for receiving data uploaded by the slave mode node.

[0013] Preferably, the two relay paths include a first relay path and a second relay path, wherein the first relay path includes a first slave mode node, a second slave mode node to an mth slave mode node connected in sequence; the second relay path includes an nth slave mode node, an n-1th slave mode node to an mth slave mode node connected in sequence, wherein n is the number of slave mode nodes, and n>m.

[0014] Preferably, the power carrier device of the slave mode node is used to collect the current on the outdoor cable side of the sending and receiving ends of the outdoor equipment in the automatic block section, the current on the rail lead wires at the sending and receiving ends, and the temperature information of the double-body protection box.

[0015] Preferably, the power carrier device includes a driving circuit, a power carrier modem, an MCU controller, a dip switch and an input-output interface module, the MCU controller is connected to the dip switch and the power carrier modem, the power carrier modem is connected to the driving circuit, and the MCU controller is connected to the input-output interface.

[0016] More preferably, the dip switch is used to set the target node address to be sent by the power carrier device, the node address of the repeater and the power carrier signal transmission mode.

[0017] More preferably, the setting of the dip switch is set in advance according to the location of the on-site power carrier device placement point. After power-on, the power carrier device determines whether it is a relay node or an ordinary node according to the setting of the dip switch. If it is a relay node, the power carrier device forwards the received ordinary node power carrier data to be relayed to the next relay node or the final destination; if it is an ordinary node, the power carrier device sends the power carrier data to be sent to the target node address.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1) The power carrier relay system of the present invention arranges heterogeneous links of the power carrier devices of the slave mode nodes, changes the aggregation node from the first outdoor collection extension closest to the main mode node to the third or fourth outdoor collection extension, and changes from single-path relay to dual-path relay, thereby shortening the number of relay nodes, thereby comprehensively improving the efficiency and quality of long-distance data transmission in the relay mode, including shortening the transmission delay and reducing the packet loss rate, and improving both real-time performance and quality, solving the problem of short transmission distance and inability to upload long-distance data on the serial bus with multiple nodes in the past, and broadening the application scenarios of the power carrier module.

[0020] 2) The present invention shortens the number of relay nodes in each path through heterogeneous data links, and can increase the number of bus-connected slave mode nodes, thereby expanding the amount of data transmitted by the system.

[0021] 3) The present invention performs remote configuration of the master and slave nodes and addresses of the outdoor data collection extensions indoors by means of software, without the need to perform configuration outdoors, thereby improving the convenience of configuration. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the power line carrier relay system in the present invention;

[0023] Figure 2 It is a structural diagram of a traditional power line carrier relay system;

[0024] Figure 3 It is a structural schematic diagram of the power carrier device in the present invention;

[0025] In the attached drawings, 1 is a driving circuit, 2 is a power carrier modem, 3 is an MCU controller, 4 is a dip switch, 5 is an input / output interface, and 6 is a voltage conversion circuit. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0027] This embodiment relates to a railway power carrier relay system based on heterogeneous links. The system is based on a master-slave mode and includes a power carrier device of a master mode node and a plurality of power carrier devices of slave mode nodes.

[0028] The power carrier device has two working modes: master mode node and slave mode node. All track circuit outdoor acquisition extensions (power carrier devices located outdoors for acquisition) are configured as slave mode nodes, and indoor carrier hosts (power carrier devices located indoors) are configured as master mode nodes.

[0029] The indoor carrier host of the master mode node is responsible for the management of the entire system and receiving data uploaded by the slave mode nodes.

[0030] There are multiple power carrier devices of slave mode nodes on a bus, one of which is a convergence node, which aggregates the data collected by other outdoor collection extensions and sends it to the indoor carrier host of the master mode node, and the others are relay nodes but not convergence nodes. The power carrier device of the slave mode node is used to collect the following data, including: the collection of the outdoor cable side current of the sending end and the receiving end of the outdoor equipment in the automatic block section, the collection of the rail lead-in wire current (long inside, long outside, short inside, short outside) at the sending end and the receiving end, and the collection of information such as the temperature of the double-body protection box.

[0031] Let's take an example to explain it in detail: the indoor carrier host is used as the main mode node, and one outdoor collection extension is connected to a bus every 1 km, with a total of 15 outdoor collection extensions. Figure 1 In this embodiment, the third outdoor collection extension is used as the aggregation node, the first outdoor collection extension and the fifteenth outdoor collection extension are ordinary nodes, and the others are relay nodes. On the first relay path, the first outdoor collection extension transmits the collected data to the second outdoor collection extension, and the second outdoor collection extension transmits it to the third outdoor collection extension; on the second relay path, the fifteenth outdoor collection extension transmits it to the fourteenth outdoor collection extension, and the fourteenth outdoor collection extension transmits it to the thirteenth outdoor collection extension, and they are transmitted sequentially to the third outdoor collection extension, and the third outdoor collection extension is used as the aggregation node to upload it to the indoor carrier host. This is different from the traditional sequential transmission mode in which the fifteenth collection extension transmits it to the fourteenth collection extension, and then transmits it forward in sequence until the first collection extension converges and transmits it to the indoor carrier host.

[0032] This embodiment adopts a heterogeneous data link transmission mode, which reduces the number of relays during long-distance relay transmission, thereby providing reliable data transmission with short transmission delay and high data quality; because the amount of data accommodated by the power carrier device is related to the number of relay nodes, the heterogeneous data link can also increase the system capacity (i.e., the number of slave mode nodes connected by the bus). Figure 2 shown.

[0033] After project testing, considering the distance from the aggregation node to the indoor carrier host, the aggregation node is preferably placed at the third or fourth outdoor collection extension close to the indoor carrier host.

[0034] like Figure 3 The power carrier device includes a driving circuit 1, a power carrier modem 2, an MCU controller 3, a dip switch 4, an input / output interface module 5 and a voltage conversion circuit 6.

[0035] The power carrier modem 2 is connected to the driving circuit 1 , the MCU controller 3 and the voltage conversion circuit 6 respectively, and the MCU controller 3 is connected to the dip switch 4 and the input / output interface module 5 respectively.

[0036] The driving circuit 1 includes a protective diode, a transient diode, a balanced input LC low-pass filter, a high current output line driver, and an analog switch to ensure isolation between the receiving signal and the transmitting signal.

[0037] The power carrier modem 2 includes: a chip with power carrier function and a FLASH memory loaded with a protocol stack, and adopts advanced spread spectrum modulation technology to achieve high-speed and very powerful communication and data transmission capabilities. The carrier chip is an IT900 chip, and the memory is an M24512 memory. The spread spectrum modulation technology is an orthogonal frequency division multiplexing (OFDM) modulation technology, which can provide cost-effective and reliable half-duplex asynchronous data communication through the existing power lines, and improves the anti-interference ability.

[0038] The MCU controller 3 includes an embedded ARM control chip and two RS232 interfaces arranged on the embedded ARM control chip. One of the RS232 interfaces is used to control the working process of the power carrier modem 2 and understand the data transmission status; the other RS232 interface is connected to the input and output interface module 5, reads the data sent by the power carrier line from the peripheral device communication, and receives the decoded data of the power carrier to the peripheral device. The ARM control chip preferably adopts LPC1756, and also includes multiple I / O ports. Two dip switches 4 are connected through 12 I / O lines in the I / O port to determine whether the power carrier device is a normal node or a relay node, and control the routing of each node.

[0039] The ARM control chip reads the data of the DIP switch 4 and decides whether the power carrier device is a common node or a relay node. If it is a relay node, the received power carrier data of the common node to be relayed is forwarded to the next relay node or the final destination; if it is a common node, the power carrier data to be sent is sent to the target node address. The relay forwarding function further improves the reliability of data transmission and solves the communication problem of long-distance nodes.

[0040] The dip switch 4 is used to set the target node address and relay node address to be sent by the power carrier device, and the power carrier signal transmission mode.

[0041] The input / output interface 5 provides an external interface and power input, including a 5V working power input for the line driver and analog switch in the driving circuit 1, and also includes a power carrier signal channel and a TTL level 232 interface for digital signal communication with external devices.

[0042] The voltage conversion circuit 6 is used to provide the power required by the internal circuit of the device, and converts the 5V voltage into a 3.3V voltage for use by the MCU controller 3 and the FLASH in the power carrier modem 2 inside the device.

[0043] The common node mode or relay node mode of the power carrier device can also be realized through software configuration.

[0044] According to the location of the on-site placement point of the power carrier device, the setting of the code switch 4 is performed first. After power-on, the ARM control chip of the MCU controller 3 in the power carrier device working in the slave node mode determines whether it is a relay node or a common node according to the setting of the code switch 4. If it is a relay node, the power carrier device forwards the received common node power carrier data to be relayed to the next relay node or the final destination; if it is a common node, the power carrier device sends the power carrier data to be sent to the target node address.

[0045] The transmission distance of a power carrier device can reach 3-4km. The power carrier device can be adjusted to the common node mode or relay node mode through the DIP switch or software configuration. Through the cooperation of multiple power carrier devices in different working modes, as well as the joint action of the DIP switch hardware setting and the software configuration enhanced adaptive algorithm, a single bus can carry no less than 30 nodes. The power carrier device in the slave node mode is ID-numbered according to the location of the on-site placement point, and the enhanced adaptive algorithm is used to solve the problem of reliable signal transmission, instead of listening to the competitive bus, and continuously relaying 30 node data devices.

[0046] The communication frequency range is greater than 30kHz, and the transmission mode has multiple standards such as FCC, AIIB, and CENELEC-A to choose from, which can achieve reliable data transmission in application scenarios such as strong electromagnetic interference environment, strong train traction return harmonic interference, strong vibration environment, and complex climate environment.

[0047] The device has large capacity, long transmission distance, relay and strong anti-interference ability. The device is used to realize the collection of current on the outdoor cable side of the sending and receiving ends of the outdoor equipment in the automatic block section, the collection of the rail lead-in wire current (long inside, long outside, short inside, short outside) at the sending and receiving ends, and the collection of information such as the temperature of the double-body protection box. Every two outdoor devices are separated by 1km, a single bus carries no less than 30 nodes, and the transmission distance of a single bus is no less than 15km to prevent interference from adjacent line sections.

[0048] Monitoring content includes:

[0049] 1) Current collection at the cable side of the transmitting and receiving ends, and the E1 terminal cable of the tuning and matching unit in the double-body protection box beside the track; the rail lead wire current sensor is installed in the double-body protection box beside the track to collect the rail lead wire current (long inside, long outside, short inside, short outside);

[0050] 2) Collect the temperature inside the double-body protection box, with many collection points, large amount of data, and high real-time requirements; because the application scenario is located beside the railway line, the electrified traction railway power supply will generate strong magnetic field and electric field interference. When the locomotive uses thyristors for stepless speed regulation of the train, a large amount of odd harmonic current will be generated. When the positive and negative half-waves produce asymmetric distortion, a large even harmonic current will be generated. Since the locomotive starts, brakes, and raises the pantograph, a sudden change in the traction current will be formed, and a rich continuous spectrum of traction current will be formed. When the two rails are in balance, the above-mentioned odd and even harmonic currents, the sudden continuous spectrum current, and the fundamental current do not constitute interference to the ground and locomotive receiving equipment. When the two rails are unbalanced, the above interference will emerge. The device integrates an advanced power line baseband modulator, based on orthogonal frequency division multiplexing (OFDM) modulation technology, and can provide cost-effective and reliable half-duplex asynchronous data communication through the existing power lines, improving the anti-interference ability. At the same time, the device integrates relay forwarding function, which further improves the reliability of data transmission and solves the communication problem of long-distance nodes.

[0051] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A railway power carrier relay system based on heterogeneous links, the system is based on a master-slave mode, including a power carrier device of a master mode node and a plurality of power carrier devices of slave mode nodes, wherein the power carrier device of one slave mode node is a convergence node, characterized in that: The system includes two relay paths, and the power carrier devices of the slave mode nodes in each relay path sequentially transmit the collected data to the power carrier device of the aggregation node, which is then aggregated by the power carrier device of the aggregation node and transmitted to the power carrier device of the master mode node; The sink node is the mth slave mode node close to the master mode node end, where m≠1.

2. A railway power carrier relay system based on heterogeneous links according to claim 1, characterized in that: The power carrier device of the master mode node is arranged indoors, that is, an indoor carrier host.

3. According to a railway power carrier relay system based on heterogeneous links as described in claim 1, it is characterized in that: The power carrier device of the slave mode node is arranged outdoors, that is, an outdoor data collection extension.

4. A railway power carrier relay system based on heterogeneous links according to claim 1, characterized in that: The aggregation node is a third slave mode node or a fourth slave mode node.

5. A railway power carrier relay system based on heterogeneous links according to claim 1, characterized in that: The power carrier device of the master mode node is responsible for the management of the entire power carrier relay system and for receiving data uploaded by the slave mode node.

6. A railway power carrier relay system based on heterogeneous links according to claim 1, characterized in that: The two relay paths include a first relay path and a second relay path, wherein the first relay path includes a first slave mode node, a second slave mode node to an mth slave mode node connected in sequence; the second relay path includes an nth slave mode node, an n-1th slave mode node to an mth slave mode node connected in sequence, wherein n is the number of slave mode nodes, and n>m.

7. A railway power carrier relay system based on heterogeneous links according to claim 1, characterized in that: The power carrier device of the slave mode node is used to collect the current of the outdoor cable side of the sending end and the receiving end of the outdoor equipment in the automatic block section, the current of the rail lead wires at the sending end and the receiving end, and the temperature information of the double-body protection box.

8. The railway power carrier relay system based on heterogeneous links according to claim 1 is characterized in that: The power carrier device includes a driving circuit, a power carrier modem, an MCU controller, a dip switch and an input / output interface module. The MCU controller is connected to the dip switch and the power carrier modem, the power carrier modem is connected to the driving circuit, and the MCU controller is connected to the input / output interface.

9. A railway power carrier relay system based on heterogeneous links according to claim 8, characterized in that: The dip switch is used to set the target node address to be sent by the power carrier device, the node address of the repeater and the power carrier signal transmission mode.

10. A railway power carrier relay system based on heterogeneous links according to claim 8, characterized in that: According to the location of the on-site power carrier device placement point, the setting of the dip switch is set in advance. After power-on, the power carrier device determines whether it is a relay node or an ordinary node according to the setting of the dip switch. If it is a relay node, the power carrier device forwards the received power carrier data of the ordinary node to be relayed to the next relay node or the final destination; If it is a common node, the power carrier device sends the power carrier data to be sent to the target node address.

Images