High-power low-voltage direct-current remote feed system and method for power tunnel

Abstract

The invention discloses a high-power low-voltage direct-current remote feed system and method for an electric power tunnel. The system comprises a power supply, a plurality of power supply nodes and a plurality of pieces of electric equipment in the tunnel, the plurality of power supply nodes are connected with a power supply, and the plurality of power supply nodes are connected in parallel; the electric equipment in each tunnel is connected with an independent power supply node; each power supply node comprises an energy storage unit and a voltage regulation unit which are arranged in parallel; and two ends of the energy storage unit and the voltage regulation unit are respectively connected with a power supply and electric equipment in the tunnel. The impact of short-time large current of the electric equipment on the power supply bus is prevented, and the power transmission efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power tunnels, and in particular to a high-power low-voltage direct current remote feeding system and method for a power tunnel. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] In some power tunnels, there is no 220V AC power supply, and it is necessary to use remote DC power feeding at a safe voltage (<36V) to power the cable monitoring equipment in the tunnel. When the power tunnel is long, it is necessary to provide long-distance low-voltage power supply to the electrical equipment in the power tunnel.

[0004] When power is currently supplied to electrical devices over long distances, all electrical devices are powered on at the same time, generating a large current instantly, causing most of the power to be consumed on the power cables, resulting in low power transmission efficiency. Summary of the invention

[0005] In order to solve the above problems, the present invention proposes a high-power low-voltage DC remote feeding system and method for a power tunnel to prevent short-term high current of electrical equipment from impacting the power supply bus and improve power transmission efficiency.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] In the first aspect, a high-power low-voltage DC remote power feeding system for a power tunnel is proposed, comprising a power supply, a plurality of power supply nodes and a plurality of power-consuming devices in the tunnel;

[0008] The multiple power supply nodes are all connected to a power source, and the multiple power supply nodes are connected in parallel;

[0009] Each electrical equipment in the tunnel is connected to a separate power supply node;

[0010] Each power supply node includes an energy storage unit and a voltage regulation unit arranged in parallel; both ends of the energy storage unit and the voltage regulation unit are respectively connected to the power supply and the electrical equipment in the tunnel.

[0011] Furthermore, the power supply can supply power to the energy storage unit and the voltage regulation unit simultaneously;

[0012] The energy storage unit and the voltage regulation unit can simultaneously supply power to electrical equipment in the tunnel.

[0013] Furthermore, a power-on switch is provided between each power supply node and the power source;

[0014] The power-on switch will be turned on only after the set delay time is reached; when the power-on switch is turned on, the circuit between the power supply and the energy storage unit and the voltage regulation unit is turned on.

[0015] Furthermore, all power-on switches are turned on in a time-sharing manner.

[0016] Furthermore, each power supply node has a separate number.

[0017] Furthermore, a fuse unit is provided between each power supply node and the power source.

[0018] Furthermore, each power supply node also includes a total output control unit;

[0019] The energy storage unit and the voltage regulation unit in the power supply node are connected to the total output control unit in the power supply node, and the total output control unit is connected to the electrical equipment in the tunnel;

[0020] The total output control unit is used to control the circuit connection between the energy storage unit and the voltage regulation unit and the electrical equipment in the tunnel according to the set power-on time, power-off time and power-on cycle.

[0021] Further, each power supply node is communicatively connected to the general dispatching unit;

[0022] The general dispatching unit is used to control the power supply to provide peak-shifted power to each power supply node.

[0023] In the second aspect, a power supply method for a high-power low-voltage DC remote feeding system in a power tunnel proposed in the first aspect is proposed, comprising:

[0024] Power each power node through a power supply;

[0025] Part of the electric energy entering the power supply node enters the energy storage unit, and the other part enters the voltage regulation unit; the voltage regulation unit and the energy storage unit simultaneously output electric energy to power the electrical equipment in the tunnel connected to the power supply node.

[0026] Furthermore, each power-on switch is turned on after a set delay time is reached; and the power supply is used to supply power to each power supply node.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention proposes a high-power low-voltage direct current remote power feeding system and method for an electric tunnel. The system configures a separate power supply node for each electric device in the tunnel, and sets a parallel energy storage unit and a voltage regulation unit in each power supply node. When it is necessary to power the electric device, the power supply supplies power to each power supply node, and part of the electric energy entering the power supply node enters the energy storage unit, and the other part enters the voltage regulation unit, which is supplied to the electric device by the voltage regulation unit. At the same time, the energy storage unit outputs electric energy in parallel to power the electric device, thereby preventing the short-term high current of the electric device from causing an impact on the power supply bus connecting the power supply and each power supply node, thereby improving the power transmission efficiency of the power supply bus. In addition, multiple power supply nodes of the system are powered on in a time-sharing manner, further preventing all power supply nodes from being powered on at the same time to cause a short-term impact on the power supply bus, thereby improving the power transmission efficiency of the power supply bus.

[0029] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0031] Figure 1 The overall structural diagram of the remote power feeding system disclosed in the embodiment is as follows;

[0032] Figure 2 This is a schematic diagram of a hierarchical energy storage design disclosed in an embodiment. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0035] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0036] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0037] Example 1

[0038] This embodiment discloses a high-power low-voltage DC remote feeding system for a power tunnel, such as Figure 1 , Figure 2 As shown, it includes a power supply, multiple power supply nodes and multiple electrical equipment in the tunnel;

[0039] The multiple power supply nodes are all connected to a power source, and the multiple power supply nodes are connected in parallel;

[0040] Each electrical equipment in the tunnel is connected to a separate power supply node;

[0041] Each power supply node includes an energy storage unit and a voltage regulation unit arranged in parallel; both ends of the energy storage unit and the voltage regulation unit are respectively connected to the power supply and the electrical equipment in the tunnel.

[0042] Among them, the power supply adopts a high-power intelligent power supply with a maximum output power of 1200W. It supports output voltage adjustment with a voltage adjustment range of 50% to 120% of the rated output voltage. It supports short circuit, overvoltage, overload and overheating protection, and supports remote and local control.

[0043] Multiple power supply nodes are connected in parallel and connected to a power source through a power supply bus after being connected in parallel; the power supply bus is composed of power supply cables of different logarithms selected according to the power consumption of electrical equipment in the tunnel.

[0044] In this embodiment, a safety unit is provided between each power supply node and the power source, and the safety unit is used to disconnect the power supply node from the power source when the power consumption of the power supply node and the power-consuming device is abnormal.

[0045] Preferably, a junction box is provided at each electrical equipment deployment location in the tunnel; the junction box connects the power supply node with the power supply bus, and a safety unit is provided in the junction box to prevent abnormal power consumption of the power supply node and electrical equipment at the current location from affecting the power supply bus.

[0046] The power supply node of this embodiment supplies power to the electrical equipment in the tunnel connected thereto, and monitors the power supply status such as the output current.

[0047] When multiple power supply nodes are powered on at the same time, the large current at the moment of power-on will consume most of the power consumption on the power supply bus, thereby reducing the power transmission efficiency of the power supply bus; in order to prevent all power supply nodes from being powered on at the same time and causing a short-term impact on the power supply bus, this embodiment limits the power supply nodes to be powered on in a time-sharing manner.

[0048] To this end, this embodiment stipulates that each power supply node has a separate number, and the power supply node is powered on in time according to the number.

[0049] Specifically, a power-on switch is provided between each power supply node and the power source;

[0050] The power-on switch will be turned on only after the set delay time is reached; when the power-on switch is turned on, the circuit between the power supply and the energy storage unit and the voltage regulation unit is connected, the power supply node is powered on, and the power supply supplies power to the energy storage unit and the voltage regulation unit in the power supply node.

[0051] Among them, all power-on switches are turned on in time-sharing manner, and each power-on switch is located between the power supply node and the power supply bus; and the delay time of each power-on switch is configurable.

[0052] In order to further reduce the high current impact on the power supply bus when the electrical equipment is powered on, this embodiment adopts a hierarchical energy storage design, such as Figure 2 As shown, each power supply node is defined to include an energy storage unit and a voltage regulating unit arranged in parallel; the two ends of the energy storage unit and the voltage regulating unit are respectively connected to the power supply and the electrical equipment in the tunnel; the power supply can supply power to the energy storage unit and the voltage regulating unit at the same time; the energy storage unit and the voltage regulating unit can supply power to the electrical equipment in the tunnel at the same time.

[0053] When the power supply node is powered on, the power supply supplies power to the energy storage unit and the voltage regulation unit in the power supply node. Part of the electric energy enters the energy storage unit of the power supply node, and the other part enters the voltage regulation unit of the power supply node. The voltage regulation unit adjusts the voltage of the electric energy to the voltage required by the power-consuming equipment, and then transmits it to the power-consuming equipment to power the power-consuming equipment. While the voltage regulation unit is supplying power to the power-consuming equipment, the energy storage unit outputs part of the electric energy to power the power-consuming equipment, thereby preventing the short-term high current of the power-consuming equipment from impacting the power supply bus.

[0054] Preferably, two ends of the energy storage unit and the voltage regulation unit are connected to the power supply bus and the power-consuming device respectively.

[0055] The power supply node of this embodiment also has an adaptive energy-saving function. When the power-consuming device does not need to be powered for a long time, it can perform timed power-on and timed power-off for the power-consuming device. Specifically: each power supply node also includes a total output control unit;

[0056] The energy storage unit and the voltage regulation unit in the power supply node are connected to the total output control unit in the power supply node, and the total output control unit is connected to the electrical equipment in the tunnel;

[0057] The total output control unit is used to control the circuit connection between the energy storage unit and the voltage regulation unit and the electrical equipment in the tunnel according to the set power-on time, power-off time and power-on cycle, so as to power on or off the electrical equipment. When the electrical equipment is powered on, the energy storage unit and the voltage regulation unit are used to supply power to the electrical equipment at the same time.

[0058] Among them, the power-on time, power-off time and power-on cycle of the power-consuming equipment are all configurable.

[0059] Each power supply node in this embodiment supports millisecond-level unified scheduling and peak-shifting function. Each power supply node is powered on and off at a peak, thereby achieving peak-shifting operation of electrical equipment in the tunnel. Specifically, each power supply node is connected to the general scheduling unit for communication;

[0060] The general dispatching unit is used to control the power supply to provide peak-shifted power to each power supply node.

[0061] The present embodiment discloses a high-power low-voltage direct current remote power feeding system for an electric tunnel, in which a separate power supply node is configured for each electric device in the tunnel, and each power supply node includes a power storage unit and a voltage regulating unit arranged in parallel; by powering on each power supply node in a time-sharing manner, and when power is needed for the electric device, a part of the electric energy supplied to the power supply node by the power supply is distributed to the energy storage unit, and the other part is supplied to the electric device through the voltage regulating unit, and at the same time, the energy storage unit outputs electric energy in parallel to supply power to the electric device, thereby preventing the power supply node and the electric device from causing an impact on the power supply bus due to a short-term high current, improving the power transmission efficiency of the power supply bus, realizing direct current low-voltage long-distance power supply in the power tunnel, solving the influence of line loss, short-term fluctuation of equipment power consumption, peak power consumption fluctuation, etc. on power supply stability, supporting burst scheduling, periodic scheduling, etc., and enriching the adaptability of the high-power low-voltage direct current remote power feeding system.

[0062] Example 2

[0063] In this embodiment, a power supply method for a high-power low-voltage DC remote feeding system in a power tunnel disclosed in Embodiment 1 is disclosed, including:

[0064] Power each power node through a power supply;

[0065] Part of the electric energy entering the power supply node enters the energy storage unit, and the other part enters the voltage regulation unit; the voltage regulation unit and the energy storage unit simultaneously output electric energy to power the electrical equipment in the tunnel connected to the power supply node.

[0066] Furthermore, each power-on switch is turned on after the set delay time is reached; the power supply supplies power to each power supply node, thereby realizing time-sharing power-on of multiple power supply nodes.

[0067] It should be noted that the power supply method for a high-power low-voltage DC remote feeding system in a power tunnel provided in the above embodiment belongs to the same concept as the high-power low-voltage DC remote feeding system in a power tunnel disclosed in Example 1. The specific implementation process is detailed in Example 1 and will not be repeated here.

[0068] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A high-power low-voltage DC remote feeding system for a power tunnel, characterized in that: Including power supply, multiple power supply nodes and multiple electrical equipment in the tunnel; The multiple power supply nodes are all connected to a power source, and the multiple power supply nodes are connected in parallel; Each electrical equipment in the tunnel is connected to a separate power supply node; Each power supply node includes an energy storage unit and a voltage regulation unit arranged in parallel; both ends of the energy storage unit and the voltage regulation unit are respectively connected to the power supply and the electrical equipment in the tunnel.

2. A high-power low-voltage DC remote feeding system for a power tunnel as claimed in claim 1, characterized in that: The power supply can supply power to the energy storage unit and the voltage regulation unit at the same time; The energy storage unit and the voltage regulation unit can simultaneously supply power to electrical equipment in the tunnel.

3. A high-power low-voltage DC remote feeding system for a power tunnel as claimed in claim 1, characterized in that: A power-on switch is provided between each power supply node and the power supply; The power-on switch will be turned on only after the set delay time is reached; when the power-on switch is turned on, the circuit between the power supply and the energy storage unit and the voltage regulation unit is turned on.

4. A high-power low-voltage DC remote power feeding system for a power tunnel as claimed in claim 3, characterized in that: All power-on switches are turned on in a time-sharing manner.

5. The high-power low-voltage DC remote power feeding system for a power tunnel according to claim 1, characterized in that: Each power supply node has a unique number.

6. A high-power low-voltage DC remote feeding system for a power tunnel as claimed in claim 1, characterized in that: A fuse unit is provided between each power supply node and the power source.

7. The high-power low-voltage DC remote feeding system for a power tunnel according to claim 1, characterized in that: Each power supply node also includes a total output control unit; The energy storage unit and the voltage regulation unit in the power supply node are connected to the total output control unit in the power supply node, and the total output control unit is connected to the electrical equipment in the tunnel; The total output control unit is used to control the circuit connection between the energy storage unit and the voltage regulation unit and the electrical equipment in the tunnel according to the set power-on time, power-off time and power-on cycle.

8. The high-power low-voltage DC remote feeding system for a power tunnel according to claim 1, characterized in that: Each power supply node is in communication connection with the general dispatching unit; The general dispatching unit is used to control the power supply to provide peak-shifted power to each power supply node.

9. A power supply method for a high-power low-voltage DC remote feeding system in a power tunnel according to any one of claims 1 to 8, characterized in that: include: Power each power node through a power supply; Part of the electric energy entering the power supply node enters the energy storage unit, and the other part enters the voltage regulation unit; the voltage regulation unit and the energy storage unit simultaneously output electric energy to power the electrical equipment in the tunnel connected to the power supply node.

10. A power supply method for a high-power low-voltage DC remote feeding system in a power tunnel as claimed in claim 9, characterized in that: Each power-on switch is turned on after the set delay time is reached; the power supply is used to supply power to each power supply node.

Images