A new energy auxiliary power supply system of regenerative electric energy of electrified railway
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA RAILWAY XIAN GRP CO LTD
- Filing Date
- 2025-05-29
- Publication Date
- 2026-05-29
AI Technical Summary
[0007]本实用新型的目的在于提供一种电气化铁路再生电能新能源辅助供电系统，解决现有再生电能利用系统和新能源发电系统可靠性低且依赖公共电网的问题
[0021] This utility model provides a renewable energy auxiliary power supply system for electrified railways. It consists of a main power supply circuit and a backup power supply circuit. The main power supply circuit draws power from the intermediate DC link of the renewable energy utilization and new energy power generation equipment, connects to an inverter to convert the DC power to AC power, and then connects to the main power transformer. The main power transformer is connected to an AC/DC power supply cabinet via a transfer switch, outputting AC 380V and DC 110V as common auxiliary power. The backup power supply circuit draws power from the 10kV public power grid, connects to a backup power transformer, and then connects to an AC/DC power supply cabinet via a transfer switch, outputting AC 380V and DC 110V as standby auxiliary power. This system provides auxiliary power for itself and supplies power to all electrical equipment within the traction substation. Compared to traditional circuits, the circuit of this invention primarily draws power from the intermediate DC link of the regenerative energy utilization and new energy power generation equipment itself. This maximizes the utilization of regenerative energy from locomotive braking and new energy power generation, significantly reducing power consumption from the 10kV public power grid. This reduces dependence on the public power grid and avoids paying high auxiliary power costs, thereby minimizing the self-use electricity costs of traction substations and sectioning stations (booths). This contributes to energy conservation, emission reduction, and improved economic efficiency in the railway transportation industry. Furthermore, this invention employs two redundant circuits: a main power supply circuit and a backup power supply circuit. When the main power supply circuit fails, it can promptly switch to the backup auxiliary power supply, greatly improving the reliability of the auxiliary power supply system and ensuring the stable operation of the regenerative energy utilization and new energy power generation equipment.
Smart Images
Figure CN224305417U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of electrified railway traction power supply technology, and in particular, it is a renewable energy auxiliary power supply system for electrified railways. Background Technology
[0002] With the rapid development of railway systems, electrified railways have become the main form of railway transportation. As the core component of railway operation, the traction power supply system of electrified railways accounts for an extremely high proportion of energy consumption, approximately 90% of the total electricity consumption of railways. Faced with increasingly severe energy and environmental pressures, the railway sector is actively seeking effective ways to conserve energy and reduce carbon emissions.
[0003] In the traction power supply system of electrified railways, traction substations transform the 110kV three-phase AC power from the public power grid into 27.5kV, which is then supplied to the overhead contact line for train traction loads. Other railway loads are supplied with 10kV power, divided into automatic closed-circuit lines and through lines. Automatic closed-circuit lines are dedicated to supplying power to railway signaling equipment. Through lines supply power to loads along the railway line, railway station loads, and substation loads.
[0004] Electric locomotives frequently apply electric braking during train operation, generating a significant amount of regenerative energy. Traditionally, this regenerative energy is fed directly back into the public power grid. However, this not only wastes energy but can also negatively impact grid stability. To effectively utilize this regenerative energy, railway authorities have recently begun installing regenerative energy utilization systems in traction substations and sectioning stations. These systems can recover, store, or reuse the regenerative energy generated during locomotive braking, significantly reducing energy consumption in the traction power supply system.
[0005] Meanwhile, the rapid development of new energy power generation technologies has also provided new energy options for railway traction power supply systems. Green, zero-carbon new energy power generation systems such as solar and wind power are gradually being introduced into railway power supply systems, forming a diversified energy supply system together with renewable energy utilization systems. The introduction of these new energy power generation systems not only helps reduce carbon emissions from railway power supply systems but also improves the system's energy utilization efficiency.
[0006] However, in practical applications, the operation of renewable energy utilization systems and new energy power generation systems still faces some challenges. On the one hand, these systems require auxiliary power supplies to support their normal operation. In some projects, the auxiliary power load reaches 100-200kW, and this auxiliary power mainly relies on the 10kV power transmission lines along the railway lines for voltage reduction, resulting in relatively high electricity prices and increasing the operating costs for railway departments. On the other hand, how to effectively dispatch and utilize recovered renewable energy and new energy power generation to meet the self-consumption needs of traction substations and section substations (stations), while reducing dependence on the public power grid, is also an urgent problem to be solved. Summary of the Invention
[0007] The purpose of this invention is to provide an auxiliary power supply system for renewable energy in electrified railways, which solves the problems of low reliability and dependence on the public power grid in existing renewable energy utilization systems and new energy power generation systems.
[0008] To achieve the above objectives, the present invention adopts the following technical solution:
[0009] A renewable energy auxiliary power supply system for electrified railways includes a main power supply circuit and a backup power supply circuit.
[0010] In the main power supply circuit, the renewable energy utilization and new energy power generation equipment is electrically connected to the inverter, the inverter is electrically connected to the main power supply transformer, and the main power supply transformer is electrically connected to the input terminal of the AC / DC power supply cabinet through a transfer switch.
[0011] In the backup power supply circuit, the public power grid is electrically connected to the backup transformer, and the backup transformer is electrically connected to the input terminal of the AC / DC power supply cabinet through a transfer switch.
[0012] Furthermore, a main power disconnect switch is connected between the renewable energy utilization and new energy power generation equipment and the inverter.
[0013] Furthermore, a backup disconnect switch is connected between the public power grid and the backup transformer.
[0014] Furthermore, a circuit breaker is connected between the transfer switch and the input terminal of the AC / DC power supply cabinet.
[0015] Furthermore, the renewable energy utilization and new energy power generation equipment is equipped with an energy storage unit.
[0016] Furthermore, the inverter is connected to the DC link of renewable energy utilization and new energy power generation equipment.
[0017] Furthermore, the AC / DC power supply cabinet is equipped with a storage battery, which is connected to renewable energy utilization and new energy power generation equipment through the power converter inside the cabinet.
[0018] Furthermore, the output end of the AC / DC power supply cabinet is connected to renewable energy utilization and new energy power generation equipment and electrical equipment in the traction substation.
[0019] Furthermore, the output voltage of the AC / DC power supply cabinet is AC380V and DC110V.
[0020] Compared with the prior art, the present invention has the following beneficial effects:
[0021] This utility model provides a renewable energy auxiliary power supply system for electrified railways. It consists of a main power supply circuit and a backup power supply circuit. The main power supply circuit draws power from the intermediate DC link of the renewable energy utilization and new energy power generation equipment, connects to an inverter to convert the DC power to AC power, and then connects to the main power transformer. The main power transformer is connected to an AC / DC power supply cabinet via a transfer switch, outputting AC 380V and DC 110V as common auxiliary power. The backup power supply circuit draws power from the 10kV public power grid, connects to a backup power transformer, and then connects to an AC / DC power supply cabinet via a transfer switch, outputting AC 380V and DC 110V as standby auxiliary power. This system provides auxiliary power for itself and supplies power to all electrical equipment within the traction substation. Compared to traditional circuits, the circuit of this invention primarily draws power from the intermediate DC link of the regenerative energy utilization and new energy power generation equipment itself. This maximizes the utilization of regenerative energy from locomotive braking and new energy power generation, significantly reducing power consumption from the 10kV public power grid. This reduces dependence on the public power grid and avoids paying high auxiliary power costs, thereby minimizing the self-use electricity costs of traction substations and sectioning stations (booths). This contributes to energy conservation, emission reduction, and improved economic efficiency in the railway transportation industry. Furthermore, this invention employs two redundant circuits: a main power supply circuit and a backup power supply circuit. When the main power supply circuit fails, it can promptly switch to the backup auxiliary power supply, greatly improving the reliability of the auxiliary power supply system and ensuring the stable operation of the regenerative energy utilization and new energy power generation equipment.
[0022] This invention, through its unique circuit design, effectively solves the problems of high cost, low reliability, and dependence on the public power grid in traditional auxiliary power supplies. It has significant economic and social benefits and broad application prospects in the field of electrified railway traction power supply technology. Attached Figure Description
[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 This is a diagram of the electrified railway renewable energy auxiliary power supply system of this utility model.
[0025] Among them: 1-Renewable energy utilization and new energy power generation equipment, 3-Main power disconnecting switch, 4-Inverter, 5-Main power transformer, 6-Transfer switch, 7-Circuit breaker, 8-AC / DC cabinet, 9-Backup disconnecting switch, 10-Backup transformer. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0029] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0030] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0031] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0032] The present invention will now be described in further detail with reference to the accompanying drawings:
[0033] See Figure 1 This utility model provides a renewable energy auxiliary power supply system for electrified railways, including a main power supply circuit and a backup power supply circuit. In the main power supply circuit, the renewable energy utilization and new energy power generation equipment 1 is sequentially connected to the input terminals of the main power disconnect switch 3, inverter 4, main power transformer 5, transfer switch 6, circuit breaker 7, and AC / DC power supply cabinet 8. In the backup power supply circuit, the 10kV public power grid is sequentially connected to the input terminals of the backup power disconnect switch 9, backup power transformer 10, transfer switch 6, circuit breaker 7, and AC / DC power supply cabinet 8. The renewable energy utilization and new energy power generation equipment 1 is equipped with an energy storage unit. The AC / DC power supply cabinet 8 is equipped with a battery, which is connected to the renewable energy utilization and new energy power generation equipment 1 through an internal converter. When the electrified railway renewable energy auxiliary power supply system is started, the battery provides power to start the renewable energy utilization and new energy power generation equipment 1.
[0034] The main power supply circuit draws power from the intermediate DC link of the renewable energy utilization and new energy power generation equipment 1. First, it connects to the main power supply isolating switch 3, then to the inverter 4 to convert DC to AC. Next, it adjusts the voltage through the main power supply transformer 5, then connects to the transfer switch 6, then to the circuit breaker 7, and finally to the AC / DC switch cabinet 8, thereby outputting AC380V and DC110V to provide common auxiliary power for the renewable energy utilization and new energy power generation equipment 1 and the electrical equipment in the traction substation.
[0035] The backup power supply circuit draws power from the 10kV public power grid, first passing through the backup power disconnect switch 9, then connecting to the backup power transformer 10 for voltage transformation, then connecting to the transfer switch 6, then connecting to the circuit breaker 7, and finally connecting to the AC / DC power cabinet 8, outputting AC380V and DC110V, serving as backup auxiliary power for renewable energy utilization and new energy power generation equipment 1 and electrical equipment in the traction substation.
[0036] Compared to traditional circuits, this invention primarily draws power from the intermediate DC link of the renewable energy utilization and new energy power generation equipment 1 itself, significantly reducing the power consumption from the 10kV public power grid, avoiding high auxiliary power costs, effectively reducing self-consumption costs, and significantly improving the efficiency of the energy-saving system. Furthermore, by employing two redundant circuits—a main power supply circuit and a backup power supply circuit—it can promptly switch to the backup power supply when the main power supply fails, greatly improving the reliability of the auxiliary power supply system and ensuring the stable operation of the renewable energy utilization and new energy power generation equipment 1.
[0037] The working method of the electrified railway renewable energy auxiliary power supply system of this utility model specifically includes the following steps:
[0038] The electrified railway's renewable energy auxiliary power supply system is started by temporarily supplying power through a 10kV power line connected to the traction substation after voltage reduction, or by the battery in the AC / DC cabinet 8, to provide starting power for the renewable energy utilization and new energy power generation equipment 1.
[0039] The main power supply circuit draws power from the intermediate DC link of the renewable energy utilization and new energy power generation equipment 1. The inverter 4 outputs the required real-time power to make the power flow. The power is output through the AC / DC switch cabinet 8 via the main power supply circuit. The auxiliary power supply provides normal power supply to support the long-term normal operation of the electrified railway renewable energy auxiliary power supply system and to provide normal power supply for the electrical equipment in the traction substation for a long time.
[0040] If inverter 4 fails, the transfer switch 6 is closed to switch the power supply to the backup power supply circuit. The backup power supply circuit draws power from the 10kV public power grid and, after conversion by the backup isolation switch 9 and backup transformer 10, provides input to the AC / DC power supply cabinet 8. The AC / DC power supply cabinet 8 outputs stable AC380V and DC110V auxiliary power to ensure that the electrified railway renewable energy auxiliary power supply system will not stop working due to a failure of the main power supply circuit.
[0041] If the main power supply transformer 5 fails, close the transfer switch 6 to switch the power supply to the backup power supply circuit, which outputs power from the AC / DC power supply cabinet 8 to prevent the auxiliary power supply from being interrupted due to the failure of the main power supply transformer 5.
[0042] This invention, through its unique circuit design, effectively solves the problems of high cost, low reliability, and dependence on the public power grid in traditional auxiliary power supplies. It is more economical, reliable, and environmentally friendly, with significant economic and social benefits, and has broad application prospects in the field of electrified railway traction power supply technology.
[0043] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A renewable energy auxiliary power supply system for electrified railways, characterized in that, Includes the main power supply circuit and the backup power supply circuit; In the main power supply circuit, the renewable energy utilization and new energy power generation equipment (1) is electrically connected to the inverter (4), the inverter (4) is electrically connected to the main power supply transformer (5), and the main power supply transformer (5) is electrically connected to the input terminal of the AC / DC power supply cabinet (8) through the transfer switch (6). In the backup power supply circuit, the public power grid is electrically connected to the backup transformer (10), and the backup transformer (10) is electrically connected to the input terminal of the AC / DC power supply cabinet (8) through a changeover switch (6).
2. The electrified railway renewable energy auxiliary power supply system according to claim 1, characterized in that, The renewable energy utilization and new energy power generation equipment (1) is connected to the inverter (4) by a main power disconnect switch (3).
3. The electrified railway renewable energy auxiliary power supply system according to claim 1, characterized in that, A backup disconnect switch (9) is connected between the public power grid and the backup transformer (10).
4. The electrified railway renewable energy auxiliary power supply system according to claim 1, characterized in that, A circuit breaker (7) is connected between the changeover switch (6) and the input terminal of the AC / DC cabinet (8).
5. The electrified railway renewable energy auxiliary power supply system according to claim 1, characterized in that, The renewable energy utilization and new energy power generation equipment (1) is equipped with an energy storage unit.
6. The renewable energy auxiliary power supply system for electrified railways according to claim 1, characterized in that, The inverter (4) is connected to the DC link of the renewable energy utilization and new energy power generation equipment (1).
7. The electrified railway renewable energy auxiliary power supply system according to claim 1, characterized in that, The AC / DC power cabinet (8) is equipped with a storage battery, which is connected to the renewable energy utilization and new energy power generation equipment (1) through the converter in the cabinet.
8. The electrified railway renewable energy auxiliary power supply system according to claim 1, characterized in that, The output end of the AC / DC power cabinet (8) is connected to the renewable energy utilization and new energy power generation equipment (1) and the electrical equipment in the traction substation.
9. A renewable energy auxiliary power supply system for electrified railways according to claim 1, characterized in that, The output voltage of the AC / DC power supply cabinet (8) is AC380V and DC110V.