Direct current power supply system for highway tunnel monitoring system
By adopting a DC power supply system in the highway tunnel monitoring system, combining photovoltaic power generation and energy storage technology, the high cost and low efficiency problems caused by low-voltage AC power supply are solved, and efficient and safe power supply is achieved.
Patent Information
- Application Number
- CN202422254647.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-14
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-09-14
AI Technical Summary
The existing highway tunnel monitoring system uses low-voltage AC power supply, resulting in high project cost, low power efficiency, low power factor and serious harmonic pollution, affecting the system life and reliability.
The DC power supply system is adopted, and the multi-mode hybrid power supply and distribution strategy of ‘DC + photovoltaic + energy storage’ is realized through the combination of high-voltage switch cabinets, power transformers, diesel generator sets, dual power conversion cabinets, low-voltage switch cabinets, rectifier equipment, photovoltaic panels, solar controllers and energy storage batteries, and a stable DC power supply is provided.
It improves the safety and reliability of electricity use, reduces line losses, improves the quality of electricity, saves construction costs, and achieves efficient power utilization.
Smart Images
Figure CN223079764U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a power supply system for highway tunnels, and particularly to a DC power supply system for a monitoring system of highway tunnels. Background Technique
[0002] At present, the monitoring system of highway tunnels is powered by low-voltage AC power supply, which has high project cost, low power consumption efficiency, low power factor, serious harmonic pollution and affects the service life and reliability of the monitoring system. The low-voltage DC power supply has the following advantages: there are no eddy current losses and skin effects in DC lines, the transmission capacity of DC lines of the same grade is higher than that of AC lines, the power supply distance of low-voltage DC power supply is farther than that of low-voltage AC power supply, and it is more energy-efficient. However, there is no relevant literature report on using low-voltage DC power supply for the monitoring system of highway tunnels to supply power to the monitoring system of highway tunnels. Content of the Utility Model
[0003] In view of this, the purpose of the utility model is to provide a DC power supply system for a monitoring system of highway tunnels to solve the technical problems that the current monitoring system of highway tunnels uses low-voltage AC power supply, has high project cost, low power consumption efficiency, low power factor, serious harmonic pollution and affects the service life and reliability of the monitoring system.
[0004] The purpose of the utility model is realized through the following technical solutions:
[0005] A DC power supply system for a monitoring system of highway tunnels, the monitoring system includes a number of monitoring distribution boxes arranged in the tunnel at intervals along the length direction of the tunnel, it includes a high-voltage switch cabinet, the incoming line side of the high-voltage switch cabinet is connected to a high-voltage AC transmission line, and the outgoing line side is connected to the high-voltage side of a power transformer. It also includes a diesel generator set, the outgoing line side of the diesel generator set and the low-voltage side of the power transformer are respectively connected to two incoming line sides of a dual-power conversion cabinet, the outgoing line side of the dual-power conversion cabinet is connected to the incoming line side of a low-voltage switch cabinet, the outgoing line side of the low-voltage switch cabinet is connected to the incoming line side of a rectification device, the outgoing line side of the rectification device is connected to each monitoring distribution box, it also includes a photovoltaic panel, the photovoltaic panel is connected to a solar controller, the solar controller is connected to the outgoing line side of the rectification device, the rectification device and the solar controller are communicatively connected, and the solar controller is connected to a storage battery.
[0006] Further, the low-voltage switch cabinet, the rectification device, the solar controller and the storage battery are arranged in the substation room at the tunnel entrance.
[0007] Further, a monitoring distribution box (1) and monitoring equipment are also arranged in the substation room, and the monitoring distribution box (1) supplies power to the monitoring equipment.
[0008] The beneficial effects of the utility model are:
[0009] A DC power supply system for a highway tunnel monitoring system of the present utility model improves power consumption safety and reliability, reduces line loss, improves power quality, greatly reduces rectifiers and power factor compensation circuits, and saves construction costs; this system integrates DC power supply technology, photovoltaic power generation technology and energy storage technology, and for the first time designs and implements a multi-mode hybrid power supply and distribution strategy of "DC + photovoltaic + energy storage" for highway tunnel monitoring systems.
[0010] Other advantages, objectives and features of the present utility model will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present utility model. The objectives and other advantages of the present utility model can be achieved and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings, where:
[0012] Figure 1 It is a schematic structural diagram of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0013] The following will refer to the accompanying drawings to describe the preferred embodiments of the present utility model in detail. It should be understood that the preferred embodiments are only for illustrating the present utility model and not for limiting the protection scope of the present utility model.
[0014] As Figure 1As shown in the figure, a DC power supply system for a highway tunnel monitoring system. The monitoring system includes several monitoring distribution boxes 1 arranged in the tunnel at intervals along the tunnel length direction. The several monitoring distribution boxes 1 respectively supply power to the monitoring devices such as monitoring cameras and speed measurement radars around them. The DC power supply system includes a high-voltage switch cabinet. The incoming line side of the high-voltage switch cabinet is connected to a high-voltage AC transmission line (the high-voltage AC transmission line transmits high-voltage alternating current), and the outgoing line side is connected to the high-voltage side of a power transformer. The high-voltage switch cabinet mainly consists of a cabinet body, a high-voltage vacuum circuit breaker, an energy storage mechanism, a trolley, a grounding knife switch, and a comprehensive protector, etc., which plays roles such as switching on and off, controlling, or protecting, and is prior art. The power transformer is used to convert high-voltage alternating current into low-voltage alternating current. The DC power supply system also includes a diesel generator set. The diesel generator set uses diesel to generate electricity and serves as a standby low-voltage AC power source. The outgoing line side of the diesel generator set and the low-voltage side of the power transformer are respectively connected to the two incoming line sides of a dual-power conversion cabinet. The outgoing line side of the dual-power conversion cabinet is connected to the incoming line side of a low-voltage switch cabinet. The dual-power conversion cabinet is used to detect the power supply circuit and automatically switch one or more load circuits from one power source to another power source. The main function of the low-voltage switch cabinet is to control and protect the power system, which is prior art. The outgoing line side of the low-voltage switch cabinet is connected to the incoming line side of a rectification device. The outgoing line side of the rectification device is connected to each monitoring distribution box 1 to supply power to each monitoring distribution box 1. The rectification device converts low-voltage alternating current into low-voltage direct current. The DC power supply system also includes a photovoltaic panel. The photovoltaic panel is connected to a solar controller. The solar controller is connected to the outgoing line side of the rectification device. The photovoltaic panel converts light energy into direct current and accesses the direct current into the output end of the rectification device through the solar controller to supply power to the monitoring distribution box 1 together with the direct current output by the rectification device. The rectification device and the solar controller are communicatively connected to realize the adjustment of the direct current voltage to adapt to the monitoring distribution box 1. The solar controller is connected to a storage battery to store the excess solar power as a standby power source.
[0015] The low-voltage switch cabinet, the rectification device, the solar controller, and the storage battery are arranged in the substation room at the tunnel entrance. There is a monitoring distribution box 1 in the substation room. That is, there are also monitoring devices such as monitoring cameras in the substation room. The monitoring distribution box 1 in the substation room supplies power to the monitoring devices in the substation room.
[0016] The DC power supply system integrates DC power supply technology, photovoltaic power generation technology, and energy storage technology. For the highway tunnel monitoring system, it first designs and implements a multi-mode hybrid power supply and distribution strategy of "DC + photovoltaic + energy storage".
[0017] The DC power supply for the highway tunnel monitoring system is more energy-saving and power-saving than the AC power supply, saving at least more than 10%, and the power quality is improved by at least 50%. The DC power supply has the characteristics of high efficiency, small line loss, precise dimming, and small reactive power loss, and can effectively save electric energy and improve the quality of electric energy.
[0018] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the present technical solution, and all of them should be covered within the scope of the claims of the present invention.
Claims
1. A DC power supply system for a highway tunnel monitoring system, the monitoring system comprising a plurality of monitoring distribution boxes (1) arranged in the tunnel and spaced along the length direction of the tunnel, characterized in that: It includes a high-voltage switchgear cabinet. The incoming line side of the high-voltage switchgear cabinet is connected to a high-voltage AC transmission line, and the outgoing line side is connected to the high-voltage side of a power transformer. It also includes a diesel generator set. The outgoing line side of the diesel generator set and the low-voltage side of the power transformer are respectively connected to the two incoming line sides of a dual-power conversion cabinet. The outgoing line side of the dual-power conversion cabinet is connected to the incoming line side of a low-voltage switchgear cabinet. The outgoing line side of the low-voltage switchgear cabinet is connected to the incoming line side of a rectification device. The outgoing line side of the rectification device is connected to each monitoring distribution box (1). It also includes a photovoltaic panel. The photovoltaic panel is connected to a solar controller. The solar controller is connected to the outgoing line side of the rectification device. The rectification device and the solar controller are communicatively connected. The solar controller is connected to a storage battery.
2. The DC power supply system for the highway tunnel monitoring system according to claim 1, characterized in that: The low-voltage switchgear cabinet, the rectification device, the solar controller and the storage battery are arranged in the substation room at the tunnel entrance.
3. The DC power supply system for the highway tunnel monitoring system according to claim 2, wherein: A monitoring distribution box (1) and monitoring equipment are also provided in the substation room. The monitoring distribution box (1) supplies power to the monitoring equipment.