Direct-current bus and subway direct-current bus lighting system based on power line carrier communication

Abstract

The invention discloses a direct current bus and a subway direct current bus lighting system based on power line carrier communication, the direct current bus comprises a shell with a containing groove and a bus body arranged in the containing groove, the bus body is composed of an upper layer circuit loop, a middle layer cavity used for containing a branch electricity taking connector and a lower layer circuit loop, the upper circuit loop and the lower circuit loop are respectively composed of a positive busbar, a negative busbar and a PE busbar, wherein the positive busbar and the negative busbar are arranged in parallel, the PE busbar is located between the positive busbar and the negative busbar, and the positive busbars and the negative busbars of the upper circuit loop and the lower circuit loop are arranged in opposite sequences. According to the direct-current bus structure, the construction difficulty is reduced while the power supply reliability is guaranteed, meanwhile, through a power line carrier communication mode, design and arrangement of complex communication lines and communication nodes are omitted, power communication integration is achieved, the communication cost is reduced, the coverage range is expanded, the communication performance is enhanced, and the power line communication reliability is improved. And the management level of the lamp power is improved.

Description

Technical Field

[0001] The present invention belongs to direct current lighting technology, and in particular relates to a direct current bus, and also relates to a subway direct current bus lighting system based on power carrier communication using the direct current bus. Background Art

[0002] The subway lighting system is crucial to ensure the safe operation of the subway and improve the visual comfort and safety of passengers and staff. The traditional subway AC lighting system uses LED as the main lighting source. Its DC load characteristics require the AC power supply to be adapted through a built-in AC-DC conversion circuit, but this process is inefficient and prone to harmonics. At the same time, the electrolytic capacitors in the lamp filter circuit are more easily damaged, which limits the service life of the lamp and increases the operating and maintenance costs. Therefore, the subway DC lighting system with advantages such as improved energy efficiency and extended lamp service life is gradually gaining attention.

[0003] In order to ensure that all lighting functions are not lost in the same area of ​​the station when a single fault occurs, the subway DC lighting system needs to adopt a cross-power supply method. The traditional cable wiring method has the disadvantages of cumbersome on-site construction and complex debugging. In addition, in order to achieve intelligent control of lamps and meet low-carbon requirements, the lighting system generally needs to use bus control methods such as DALI to lay communication lines separately to achieve control of lamps. In this way, the power line and communication line are wired in the same space, which brings electromagnetic compatibility problems. In addition, the laying of signal lines through pipes increases the workload of on-site installation and also causes unsightly appearance. Summary of the invention

[0004] The first object of the present invention is to provide a DC bus that can ensure power supply reliability and reduce construction difficulty.

[0005] The first object of the present invention is achieved through the following technical measures: a DC busbar, comprising a shell having a receiving groove and a busbar body arranged in the receiving groove, characterized in that the busbar body is composed of an upper circuit loop, a middle cavity for accommodating branch power connectors and a lower circuit loop, and the upper circuit loop and the lower circuit loop are both composed of a positive busbar, a negative busbar and a PE busbar located therebetween arranged in parallel, and the positive busbar and the negative busbar of the upper circuit loop and the lower circuit loop are arranged in reverse order.

[0006] The second object of the present invention is to provide a subway DC bus lighting system based on power carrier communication using the above DC bus.

[0007] The second object of the present invention is achieved by the following technical measures: a subway DC bus lighting system based on power carrier communication using the above-mentioned DC bus, characterized in that it includes an intelligent dimming system, a power carrier centralized controller, a coupler, a DC bus, a power carrier single lamp controller and an LED lamp, the intelligent dimming system is connected to the power carrier centralized controller, the power carrier centralized controller is connected to the DC bus through a coupler, the DC bus is connected to the power carrier single lamp controller through a power line, and the LED lamp is connected to the power carrier single lamp controller. The intelligent dimming system generates a control signal according to the collected information, transmits it to the power carrier centralized controller and converts it into a high-frequency control signal, the high-frequency control signal is coupled with the DC bus through the coupler and then transmitted to the single-lamp power carrier controller to control the lamp, and at the same time, the status information of the lamp is modulated by the single-lamp power carrier controller, transmitted to the power carrier centralized controller via the DC bus, and transmitted to the intelligent dimming system by the power carrier centralized controller for data aggregation.

[0008] The power carrier centralized controllers described in the present invention are two, one as the host and the other as the backup. When the intelligent dimming system detects that there is a problem in the signal transmission between it and the power carrier centralized controller as the host, the power carrier centralized controller as the backup is enabled to perform signal transmission, and at the same time, the self-check and recovery mechanism of the original power carrier controller host is started.

[0009] The single-lamp power carrier controller of the present invention collects lamp current information and compares it with the normal range. If it is normal, a heartbeat signal is sent; if it is abnormal, no operation is performed; if the intelligent dimming system does not receive a heartbeat signal within time T1, an alarm is triggered and the administrator or maintenance personnel are notified through a preset communication method.

[0010] Compared with the prior art, the present invention has the following significant effects:

[0011] (1) The DC bus structure of the present invention reduces the difficulty of construction while ensuring the reliability of power supply. At the same time, the present invention eliminates the need for complex design and arrangement of communication lines and communication nodes through power carrier communication, thereby realizing integrated power communication, reducing communication costs, expanding coverage, enhancing communication performance, and improving the management level of lamp power.

[0012] (2) The present invention can effectively extend the service life of lamps, reduce the operating cost of subway lighting systems, simplify the laying of wires, reduce the workload of on-site installation, and at the same time ensure the reliability of the lighting system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0014] Figure 1 It is a structural schematic diagram of the DC bus of the present invention;

[0015] Figure 2 It is a schematic diagram of the three-dimensional structure of the DC busbar of the present invention;

[0016] Figure 3 It is a schematic diagram of the topological structure of the subway DC bus lighting system of the present invention.

[0017] In the figure: 1- starting feeding unit and end seal, 2-fixture, 3-straight section, 4-connector, 5-power tapping unit, 6-flexible elbow, 7-intelligent dimming system, 8-power carrier centralized controller, 9-DC bus, 10-power carrier single lamp controller, 11-LED lamp, 12-communication line, 13-power line, 14-positive busbar, 15-negative busbar, 16-PE busbar, 17-shell, 18-middle cavity, 19-DC distribution box. DETAILED DESCRIPTION

[0018] The present invention is further illustrated below through the description of specific implementation methods, but this is not a limitation of the present invention. Those skilled in the art can make various modifications or improvements based on the basic idea of ​​the present invention, but as long as they do not deviate from the basic idea of ​​the present invention, they are all within the protection scope of the present invention.

[0019] like Figure 1 and Figure 2 As shown, a DC busbar 9 of the present invention includes a shell 17 with a receiving groove and a busbar body located in the receiving groove, the busbar body consists of an upper circuit loop, a middle cavity 18 and a lower circuit loop, the middle cavity 18 is used to accommodate the power-taking connector of the branch circuit so that it can be connected to the conductive busbar; the upper circuit loop and the lower circuit loop are both composed of a positive busbar 14, a negative busbar 15 arranged in parallel and a PE (protective ground) busbar 16 located therebetween, and the positive busbar 14 and the negative busbar 15 of the upper circuit loop and the lower circuit loop are arranged in reverse order.

[0020] See also Figure 2 The DC bus 9 of the present invention comprises a starting end feeding unit and an end seal 1, a fixing device 2, a straight section 3, a connector 4, a power tapping unit 5 and a flexible elbow 6, wherein the straight section 3 contains a bus body. These components and connection relationships are all prior art and are not described in detail here.

[0021] like Figure 3As shown, a subway DC bus lighting system based on power carrier communication using the above-mentioned DC bus includes an intelligent dimming system 7, a power carrier centralized controller 8, a coupler, a DC bus 9, a power carrier single lamp controller 10 and an LED lamp 11. There are two power carrier centralized controllers 8, one as a host and the other as a backup. The two power carrier centralized controllers 8 are respectively connected to the intelligent dimming system 7 through a communication line 12 (RJ45 network cable), and the two power carrier centralized controllers 8 are respectively connected to the DC bus 9 through a coupler. The DC bus 9 is connected to the power carrier single lamp controller 10 through a power line 13. The LED lamp 11 is connected to the power carrier single lamp controller 10. There are multiple groups of LED lamps 11 and the power carrier single lamp controller 10 connected to one power line, and multiple power lines are connected to the DC bus 9. The intelligent dimming system 7 generates a control signal based on the collected information of various sensors such as infrared and illumination, transmits it to the power carrier centralized controller and converts it into a high-frequency control signal. The high-frequency control signal is coupled with the DC bus through a coupler and then transmitted to the single-lamp power carrier controller to control the illumination of the lamp. At the same time, the status information of the lamp is modulated by the single-lamp power carrier controller, transmitted to the power carrier centralized controller via the DC bus, and transmitted to the intelligent dimming system by the power carrier centralized controller for data aggregation.

[0022] The present invention configures two power carrier centralized controllers on the DC bus backbone network, one as the host and the other as the backup, both of which communicate with the intelligent dimming system. When the intelligent dimming system detects a problem with signal transmission, the backup machine is immediately enabled for signal transmission. The power carrier centralized controller and the single lamp controller modulate the control signal and the lamp status signal, convert the input information into multiple parallel signals, and use fast Fourier transform to modulate the signal onto completely orthogonal carriers. Although the frequency spectra of these signals overlap, the subcarriers are orthogonal to each other, which ensures that the information of each subcarrier can be restored without distortion at the receiving end.

[0023] like Figure 3 As shown, the power carrier centralized controller 8 is connected to the DC distribution box 19, and the three-phase 380V AC power is rectified into 220V DC power through the AC incoming line switch and the rectifier module in the cabinet, and then fed to the terminal lamp circuit through the DC feeder main switch and the DC feeder branch switch.

[0024] The control process of the present invention is as follows:

[0025] 1. Combining the information collected by various sensors such as infrared and illumination, the intelligent dimming system generates a control signal and transmits it to the power carrier centralized controller host. The power carrier centralized controller host converts the control signal into a high-frequency signal by orthogonal frequency division multiplexing, and after coupling with the DC bus through a coupler, it is transmitted to the single-lamp power carrier controller. The single-lamp power carrier controller corresponding to the lamp decouples the signal of the corresponding frequency to obtain a control signal. The control signal is transmitted to the built-in driver module of the LED lamp to adjust the drive current to control the illumination of the LED lamp.

[0026] 2. The single-lamp power carrier controller collects the lamp current information and compares it with the normal range. If it is normal, it sends a heartbeat signal, and if it is abnormal, it does not operate. If the intelligent dimming system does not receive a heartbeat signal within time T1, it triggers an alarm and notifies the administrator or maintenance personnel through a preset communication method (such as SMS, etc.).

[0027] 3. The switching of the main and backup machines of the power carrier centralized controller includes: when the intelligent dimming system detects a communication failure with the power carrier centralized controller host and after a given time T2, the measured values ​​of multiple illumination sensors exceed the set values, etc., the main and backup machines will be switched, and data will be transmitted through the backup machine of the original power carrier controller, and the self-check and recovery mechanism of the original power carrier controller host will be started at the same time.

[0028] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A DC busbar, comprising a housing having a receiving slot and a busbar body located in the receiving slot, characterized in that: The busbar body consists of an upper circuit loop, a middle cavity for accommodating the power connection of the branch circuit, and a lower circuit loop. The upper circuit loop and the lower circuit loop are both composed of a positive busbar, a negative busbar and a PE busbar arranged in parallel, and the positive busbar and the negative busbar of the upper circuit loop and the lower circuit loop are arranged in reverse order.

2. A subway DC bus lighting system based on power carrier communication using the DC bus according to claim 1, characterized in that: It includes an intelligent dimming system, a power carrier centralized controller, a coupler, a DC bus, a power carrier single lamp controller and an LED lamp. The intelligent dimming system is connected to the power carrier centralized controller, the power carrier centralized controller is connected to the DC bus through a coupler, the DC bus is connected to the power carrier single lamp controller through a power line, and the LED lamp is connected to the power carrier single lamp controller. The intelligent dimming system generates a control signal according to the collected information, transmits it to the power carrier centralized controller and converts it into a high-frequency control signal. The high-frequency control signal is coupled with the DC bus through a coupler and then transmitted to the single-lamp power carrier controller to control the illumination of the lamp. At the same time, the status information of the lamp is modulated by the single-lamp power carrier controller, transmitted to the power carrier centralized controller via the DC bus, and transmitted to the intelligent dimming system by the power carrier centralized controller for data aggregation.

3. The subway DC bus lighting system based on power carrier communication according to claim 2 is characterized in that: There are two power carrier centralized controllers, one as the host and the other as the backup. When the intelligent dimming system detects a problem in the signal transmission between it and the power carrier centralized controller as the host, the power carrier centralized controller as the backup is enabled to transmit signals, and at the same time, the self-check and recovery mechanism of the original power carrier controller host is started.

4. The subway DC bus lighting system based on power carrier communication according to claim 3 is characterized in that: The single-lamp power carrier controller collects lamp current information and compares it with the normal range. If it is normal, a heartbeat signal is sent; if it is abnormal, no operation is performed. If the intelligent dimming system does not receive a heartbeat signal within time T1, an alarm is triggered and the administrator or maintenance personnel are notified through a preset communication method.

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