Highway tunnel AC / DC hybrid power supply system with high reliability
Through the AC and DC hybrid power supply system, combined with power transformers, diesel generators and rectifier equipment, the high cost problem of DC power supply equipment in highway tunnels is solved, high-reliability power supply is achieved, and the normal operation of the first-level load in the tunnel is ensured during the power outage of the city.
Patent Information
- Application Number
- CN202422483953.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2034-10-15
AI Technical Summary
In the existing highway tunnel power supply system, DC power supply equipment needs to be equipped with power adapters, which increases the power supply cost and insufficient power supply reliability, especially when the mains power is powered off, it is impossible to effectively ensure the power supply demand for first-level loads.
The AC and DC hybrid power supply system is adopted, and the power transformer and diesel generator are combined with dual power conversion cabinets, low-voltage switch cabinets and rectifier equipment to achieve hybrid power supply of AC and DC loads. When the mains power is powered off, the power supply reliability is ensured by the diesel generator and EPS (uninterruptible power supply).
It realizes high-reliability power supply for AC and DC loads in highway tunnels, reduces construction costs, and ensures the normal operation of first-level loads in the event of a power outage in the event of a municipal power outage, and improves the safety of tunnel operations.
Smart Images
Figure CN223285633U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of highway tunnel power supply, in particular to a high-reliability highway tunnel AC / DC hybrid power supply system. Background Art
[0002] Highway tunnel power supply and distribution facilities are essential for tunnel electromechanical systems and are considered foundational engineering within highway tunnel electromechanical engineering. Among tunnel electromechanical power facilities, monitoring systems, field monitoring equipment, tunnel emergency lighting, and ventilation and lighting all require a highly reliable power supply system. Therefore, tunnel power loads are classified into primary and secondary loads. Key primary loads include emergency lighting, electric signage, traffic monitoring, ventilation and lighting control systems, emergency call systems, fire detection and alarm systems, and central control systems. Other primary loads include fire pumps and smoke exhaust fans. Secondary loads include non-emergency lighting, ventilation fans, and fire water supply pumps. These loads can be categorized as either DC or AC powered based on the type of power consumed. Emergency lighting, for example, currently utilizes LED light sources and is DC powered. Meanwhile, electric signage, traffic monitoring, ventilation and lighting control systems, emergency call systems, fire detection and alarm systems, and central control systems all utilize DC power supplies. Some equipment, such as ventilators, fire pumps, smoke exhaust fans, and air conditioners, is powered directly by AC. Existing power supply and distribution facilities in highway tunnels are essentially AC powered, requiring power adapters for DC powered equipment, which invisibly increases power supply costs. Utility Model Content
[0003] In view of this, the purpose of the present invention is to provide a high-reliability AC / DC hybrid power supply system for highway tunnels to solve the technical problems of AC / DC power supply demand and power supply reliability in highway tunnels.
[0004] The purpose of this utility model is achieved through the following technical solutions:
[0005] A high-reliability AC / DC hybrid power supply system for a highway tunnel includes a power transformer and a diesel generator. The incoming line side of the power transformer is connected to a high-voltage AC transmission line. The outgoing line side of the power transformer and the outgoing line side of the diesel generator are 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 outgoing line side of the low-voltage switch cabinet is respectively connected to the AC power supply live wire and neutral wire. The ground wire of the outgoing line side of the low-voltage switch cabinet is grounded. The outgoing line side of the low-voltage switch cabinet is also connected to a rectifier. The outgoing line side of the rectifier is respectively connected to the DC power supply positive power line and neutral wire. The AC power supply live wire, neutral wire and DC power supply positive power line are arranged in parallel with a ground wire along the length of the tunnel. AC loads are connected to the AC power supply live wire, neutral wire and ground wire, and DC loads are connected to the DC power supply positive power line and neutral wire.
[0006] Furthermore, it consists of two sets and is respectively arranged at both ends of the tunnel.
[0007] Furthermore, it consists of at least three sets, two of which are respectively set at both ends of the tunnel, and the rest are set in the tunnel hole. The ones set in the tunnel hole do not include the diesel generator. The incoming side of the dual power conversion cabinet in the tunnel hole is connected to the diesel generator at the tunnel entrance through a power transformer.
[0008] Furthermore, it also includes an EPS, wherein the incoming line side of the EPS is connected to the low-voltage switch cabinet, and the outgoing line side is connected to the rectifier equipment.
[0009] The beneficial effects of the utility model are:
[0010] The utility model discloses a high-reliability AC / DC hybrid power supply system for highway tunnels. By setting a rectifier device, the low-voltage AC power on the outlet side of the low-voltage switch cabinet is converted into a low-voltage DC power supply to meet the power supply requirements of the DC load. Other AC loads are directly powered by the low-voltage AC power on the outlet side of the low-voltage switch cabinet. The system is equipped with a diesel generator. When the mains power is cut off, the diesel generator generates electricity, thereby increasing the reliability of the highway tunnel power supply. The AC power supply and DC power supply in the highway tunnel share a neutral line, which reduces costs.
[0011] For long tunnels, the power supply system of the present invention is respectively set at both ends of the tunnel.
[0012] For extra-long tunnels, the power supply system of the present invention is respectively installed at both ends of the tunnel and in the middle of the tunnel.
[0013] When the mains power is out and the diesel generator cannot supply power normally, the EPS is used to supply power to the primary load to ensure its normal operation and thus ensure the safe operation of the tunnel.
[0014] Other advantages, objectives, and features of the present invention will be described in detail in the following description and, to some extent, will be apparent to those skilled in the art upon examination and study of the following or may be learned from practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings, in which:
[0016] Figure 1 This is a principle diagram of embodiment 1 of the present utility model.
[0017] Figure 2 This is a schematic diagram of the second embodiment of the present utility model. DETAILED DESCRIPTION
[0018] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments are only for illustrating the present invention and are not intended to limit the scope of protection of the present invention.
[0019] Example 1
[0020] like Figure 1A high-reliability AC / DC hybrid power supply system for highway tunnels is shown. It includes two 10kV tunnel entrance substations, one located at each end of the tunnel entrance, and a 10kV mid-tunnel substation located in the middle of the tunnel. The 10kV tunnel entrance substations are equipped with power transformers and diesel generators, while the 10kV mid-tunnel substations are equipped with power transformers but not diesel generators. The incoming side of each power transformer is connected to a 10kV high-voltage AC transmission line that transmits high-voltage AC power. The outgoing side of the power transformer and the outgoing side of the diesel generator in the 10kV tunnel entrance substations are connected to the two incoming sides of a dual power conversion cabinet. The outgoing side of the power transformer in the 10kV mid-tunnel substation is connected to one incoming side of the dual power conversion cabinet, while the other incoming side of the dual power conversion cabinet is connected to a diesel generator in the 10kV tunnel entrance substation via a transformer. The power transformers convert high-voltage AC power into low-voltage AC power. The diesel generator set uses diesel to generate electricity as a backup power source. Diesel generators cannot be installed in tunnels. Therefore, the dual power conversion cabinets in the 10kV tunnel substation are connected to the diesel generators at the tunnel entrance substation via transformers as a backup power source. The transformers here step up and down the voltage of the diesel generators. The outgoing line of each dual power conversion cabinet is connected to a low-voltage switchgear. The dual power conversion cabinets are used to detect power circuits and automatically switch one or more load circuits from one power source to another. The low-voltage switchgear mainly controls and protects the power system and is an existing technology. The outgoing line side of each low-voltage switch cabinet is connected to an AC live wire and a neutral wire, the ground wire on the outgoing line side of each low-voltage switch cabinet is grounded, the outgoing line side of each low-voltage switch cabinet is connected to a rectifier device, the outgoing line side of each rectifier device is connected to a DC positive power supply line and a neutral wire, the AC live wire, neutral wire and DC positive power supply line on the outgoing line side of each low-voltage switch cabinet are parallel to a ground wire and arranged along the length of the tunnel, the AC load 1 in the tunnel is connected to the AC live wire, neutral wire and ground wire at its corresponding position, and the DC load 2 is connected to the DC positive power supply line and neutral wire at its corresponding position.
[0021] Rectifier equipment converts low-voltage AC power into low-voltage DC power to power DC loads. AC loads are then powered directly by low-voltage switchgear, achieving hybrid AC / DC power supply in highway tunnels. AC and DC power supply share a common neutral line, reducing construction costs. In the event of a utility power outage, diesel generators provide power, ensuring reliable power supply in highway tunnels.
[0022] When the tunnel is short, only two 10kV tunnel entrance substations are set up; when the tunnel is particularly long, a 10kV tunnel substation can be added in the tunnel.
[0023] Example 2
[0024] like Figure 2As shown, the difference from Example 1 is that it also includes an uninterruptible power supply (EPS). The EPS's incoming line side is connected to the low-voltage switchgear, and its outgoing line side is connected to the rectifier equipment. In the event of a mains power outage or a diesel generator failure, the EPS provides power to the primary load, further ensuring the reliability of the primary load power supply.
[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.
Claims
1. A high-reliability AC / DC hybrid power supply system for highway tunnels, characterized by: It includes a power transformer and a diesel generator, wherein the incoming line side of the power transformer is connected to a high-voltage AC transmission line, the outgoing line side of the power transformer and the outgoing line side of the diesel generator are 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 respectively connected to an AC power supply live wire and a neutral wire, the ground wire of the outgoing line side of the low-voltage switch cabinet is grounded, the outgoing line side of the low-voltage switch cabinet is also connected to a rectifier, the outgoing line side of the rectifier is respectively connected to a DC power supply positive power line and a neutral wire, the AC power supply live wire, the neutral wire and the DC power supply positive power line are parallel to a ground wire and arranged along the length direction of the tunnel, the AC load (1) is connected to the AC power supply live wire, the neutral wire and the ground wire, and the DC load (2) is connected to the DC power supply positive power line and the neutral wire.
2. The high-reliability highway tunnel AC / DC hybrid power supply system according to claim 1 is characterized by: It consists of two sets and is set at both ends of the tunnel respectively.
3. The high-reliability AC / DC hybrid power supply system for highway tunnels according to claim 2 is characterized by: There are at least three sets of it, two of which are set at both ends of the tunnel, and the rest are set in the tunnel hole. The ones set in the tunnel hole do not include the diesel generator. The incoming side of the dual power conversion cabinet in the tunnel hole is connected to the diesel generator at the tunnel entrance through a power transformer.
4. The high-reliability AC / DC hybrid power supply system for highway tunnels according to any one of claims 1 to 3, characterized in that: It also includes an EPS, wherein the line-input side of the EPS is connected to a low-voltage switch cabinet, and the line-out side of the EPS is connected to a rectifier device.