Self-consistent energy power supply and protection device for railway traction power supply station
By introducing photovoltaic modules and lithium battery packs into the railway traction power supply system, a multi-energy power supply system has been formed, which has solved the problem of insufficient utilization of renewable energy along the Qinghai-Tibet Railway, and has achieved the improvement of energy utilization efficiency and the enhancement of power reliability.
Patent Information
- Application Number
- CN202422415408.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-08
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-10-08
AI Technical Summary
The existing technology is difficult to effectively utilize the abundant renewable energy along the Qinghai-Tibet Railway, resulting in insufficient power reliability and safety of railway traction power supply systems.
Design a self-consistent energy power supply and protection device of the railway traction power supply station, combining photovoltaic modules, lithium battery packs, multiple DC/DC and DC/AC converters and converter protection devices to form a multi-energy power supply system, using lithium battery energy storage technology to balance the volatility of new energy, and ensuring system stability through the converter protection device.
It improves energy utilization efficiency, reduces dependence on the power grid, enhances the reliability and safety of electricity consumption, and achieves stable power supply of renewable energy.
Smart Images
Figure CN223261286U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power supply, in particular to a self-consistent energy power supply and protection device for a railway traction power supply station. Background Art
[0002] There is abundant renewable energy such as wind and light along the Qinghai-Tibet Railway. Its vast spatial resources can be used for the development and utilization of renewable energy. By making full use of the renewable energy resources according to local conditions and adopting a self-consistent energy system of "renewable energy + energy storage", the integrated development of railway traction substations and renewable energy can be achieved, which can adjust the energy consumption structure and reduce carbon emissions.
[0003] Therefore, it is necessary to design a Qinghai-Tibet Railway traction depot power supply system that can improve the reliability and safety of electricity use. Utility Model Content
[0004] The utility model provides a self-consistent energy supply and protection device for a railway traction power supply station, so as to solve the problems mentioned in the prior art.
[0005] In order to achieve the above purpose, the present invention provides the following technical solutions:
[0006] A self-consistent energy power supply and protection device for a railway traction power supply station, comprising a photovoltaic module, a lithium battery pack, a DC / DC converter 1, a DC / DC converter 2, a load-side DC / AC converter, a grid-side AC / DC converter, a converter protection device Rp1, a converter protection device Rp2, a converter protection device Rp3, a converter protection device Rp4, a bus capacitor Cp1, a bus capacitor Cp2, a bus capacitor Cm1, and a bus capacitor Cm2, wherein the photovoltaic module is connected to the input port 4 of the DC / DC converter 1, the port 1 of the DC / DC converter 1 is connected to the converter protection device Rp1, the other end of the converter protection device Rp1 is connected to the converter protection device Rp2, the DC positive bus P, the converter protection device Rp3 and converter protection device Rp4. Converter protection device Rp3 is connected to port 1 of the load-side DC / AC converter. The other end of converter protection device Rp2 is connected to bus capacitor Cp1. The other end of bus capacitor Cp1 is connected to bus capacitor Cm1, bus capacitor Cm2, bus capacitor Cp2, port 3 of DC / DC converter 1, port 2 of the load-side DC / AC converter, and neutral line N. The other end of bus capacitor Cm1 is connected to converter protection device Rp5. The other end of converter protection device Rp5 is connected to converter protection device Rp6, converter protection device Rp7, converter protection device Rp8, and negative bus M. The other end of converter protection device Rp7 is connected to the other end of bus capacitor Cm2. The other end of the converter protection device Rp8 is connected to port 3 of the load-side DC / AC converter, port 4 of the load-side DC / AC converter is connected to the traction substation load, the other end of the converter protection device Rp6 is connected to port 4 of DC / DC converter one, the lithium battery pack is connected to input port 4 of DC / DC converter two, port 1 of DC / DC converter two is connected to converter protection device Rp9, the other end of converter protection device Rp9 is connected to converter protection device Rp10, DC positive bus P, converter protection device Rp11 and converter protection device Rp12, converter protection device Rp10 is connected to port 1 of the load-side DC / AC converter, and the other end of converter protection device Rp11 is connected to bus Capacitor Cp3, the other end of bus capacitor Cp3 is connected to bus capacitor Cm3, bus capacitor Cm4, bus capacitor Cp4, port 3 of DC / DC converter 2, port 2 of the grid-side DC / AC converter, and neutral line N. The other end of bus capacitor Cm3 is connected to converter protection device Rp13, the other end of converter protection device Rp13 is connected to converter protection device Rp14, converter protection device Rp15, converter protection device Rp16, and negative bus M. The other end of converter protection device Rp15 is connected to the other end of bus capacitor Cm4, the other end of converter protection device Rp16 is connected to port 3 of the grid-side DC / AC converter, and port 4 of the grid-side DC / AC converter is connected to the traction substation load.The other end of the converter protection device Rp14 is connected to port 4 of the DC / DC converter 2.
[0007] As a further technical solution of the present utility model: the converter protection device Rp1 includes a diode D1, a diode D2, a diode D3, a diode D4 and an IGBT device T, the anode of the diode D1 is connected to the cathode of the diode D4 and the input terminal A, the cathode of the diode D1 is connected to the cathode of the diode D2 and the drain of the IGBT device T, the source of the IGBT device T is connected to the anode of the diode D3 and the anode of the diode D4, and the anode of the diode D2 is connected to the cathode of the diode D3 and the output terminal B.
[0008] As a further technical solution of the present invention: the converter protection devices Rp1-Rp16 have the same structure.
[0009] As a further technical solution of the present invention: the IGBT device T is an insulated gate bipolar transistor.
[0010] In the above technical solution, the technical effects and advantages provided by the utility model are:
[0011] This multi-energy power supply system for the Qinghai-Tibet Railway traction depot not only reduces power transmission and distribution losses and improves energy efficiency, but also reduces users' dependence on the power grid, improving the reliability and safety of electricity use. The volatility and randomness of renewable energy sources such as wind power and photovoltaics hinder the safe and reliable operation of microgrid systems. Energy storage technologies such as lithium batteries and supercapacitors can compensate for the randomness and volatility of renewable energy generation in microgrid systems, ensuring safe and stable power supply from large-scale wind power and photovoltaics. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0013] Figure 1 This is a diagram of the multi-state energy supply and protection system for a railway traction depot.
[0014] Figure 2 This is the circuit diagram of the protection device Rp.
[0015] Figure 3 This is the converter module protection schematic. DETAILED DESCRIPTION
[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0017] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are for illustrative purposes only and do not represent the only implementation method.
[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains; the terms used herein in the specification of this invention are for the purpose of describing specific embodiments only and are not intended to limit this invention; the term "and / or" used herein includes any and all combinations of one or more of the related listed items.
[0019] Example 1:
[0020] The utility model provides Figure 1The drawings shown are specifically a self-consistent energy power supply and protection device for a railway traction power supply station, including a photovoltaic module, a lithium battery pack, a DC / DC converter 1, a DC / DC converter 2, a load-side DC / AC converter, a grid-side AC / DC converter, a converter protection device Rp1, a converter protection device Rp2, a converter protection device Rp3, a converter protection device Rp4, a bus capacitor Cp1, a bus capacitor Cp2, a bus capacitor Cm1, and a bus capacitor Cm2. The photovoltaic module is connected to the input port 4 of the DC / DC converter 1, the port 1 of the DC / DC converter 1 is connected to the converter protection device Rp1, the other end of the converter protection device Rp1 is connected to the converter protection device Rp2, the DC positive bus P, and the converter. Converter protection device Rp3 and converter protection device Rp4, converter protection device Rp3 is connected to port 1 of the load-side DC / AC converter, the other end of converter protection device Rp2 is connected to bus capacitor Cp1, the other end of bus capacitor Cp1 is connected to bus capacitor Cm1, bus capacitor Cm2, bus capacitor Cp2, port 3 of DC / DC converter 1, port 2 of the load-side DC / AC converter and neutral line N, the other end of bus capacitor Cm1 is connected to converter protection device Rp5, the other end of converter protection device Rp5 is connected to converter protection device Rp6, converter protection device Rp7, converter protection device Rp8 and negative bus M, the other end of converter protection device Rp7 is connected to bus capacitor Cm2 The other end of the converter protection device Rp8 is connected to port 3 of the load-side DC / AC converter, port 4 of the load-side DC / AC converter is connected to the traction substation load, the other end of the converter protection device Rp6 is connected to port 4 of DC / DC converter 1, the lithium battery pack is connected to input port 4 of DC / DC converter 2, port 1 of DC / DC converter 2 is connected to converter protection device Rp9, the other end of converter protection device Rp9 is connected to converter protection device Rp10, DC positive bus P, converter protection device Rp11 and converter protection device Rp12, converter protection device Rp10 is connected to port 1 of the load-side DC / AC converter, and the other end of converter protection device Rp11 is connected to Bus capacitor Cp3, the other end of bus capacitor Cp3 is connected to bus capacitor Cm3, bus capacitor Cm4, bus capacitor Cp4, port 3 of DC / DC converter 2, port 2 of the grid-side DC / AC converter, and neutral line N. The other end of bus capacitor Cm3 is connected to converter protection device Rp13, the other end of converter protection device Rp13 is connected to converter protection device Rp14, converter protection device Rp15, converter protection device Rp16, and negative bus M. The other end of converter protection device Rp15 is connected to the other end of bus capacitor Cm4, the other end of converter protection device Rp16 is connected to port 3 of the grid-side DC / AC converter, and port 4 of the grid-side DC / AC converter is connected to the traction substation load.The other end of the converter protection device Rp14 is connected to port 4 of the DC / DC converter 2.
[0021] Example 2:
[0022] On the basis of Example 1, Figure 2 As shown, the converter protection device Rp1 includes a diode D1, a diode D2, a diode D3, a diode D4 and an IGBT device T. The anode of the diode D1 is connected to the cathode of the diode D4 and the input terminal A, the cathode of the diode D1 is connected to the cathode of the diode D2 and the drain of the IGBT device T, the source of the IGBT device T is connected to the anode of the diode D3 and the anode of the diode D4, and the anode of the diode D2 is connected to the cathode of the diode D3 and the output terminal B.
[0023] Example 3:
[0024] Based on the embodiment 2, the converter protection devices Rp1-Rp16 have the same structure.
[0025] Example 4:
[0026] Based on the embodiment 1, the IGBT device T is an insulated gate bipolar transistor.
[0027] Here’s how it works:
[0028] like Figure 1 As shown in the figure, taking advantage of the abundant light resources along the railway, the complementary energy of photovoltaic and energy storage is introduced into the railway traction substation's own power system and used as the main power source of the power system. Figure 1 This is a structural diagram of a power supply system that integrates light and energy storage, using a lithium battery pack as the energy storage method. The output of the lithium battery pack is passed through the input end of a DC / DC converter to further raise the battery's DC voltage and then connected to the DC bus through a switch. The output of the photovoltaic cell is passed through a DC / DC converter to raise its DC voltage and then connected to the DC bus through a switch. The DC bus is connected to the load DC / AC converter through a switch to convert DC power into AC power to power the electrical equipment used in the railway traction substation.
[0029] The positive and negative bus capacitors Cp and Cm on the DC side of each converter are connected to the DC positive bus P, negative bus M and neutral line N respectively. The positive and negative buses and positive and negative bus capacitors of each converter are connected to the converter protection device Rp respectively to ensure that the converter can be reliably cut off when a converter is short-circuited or the DC bus side capacitor of the converter is short-circuited, so as to ensure that the DC bus voltage is constant and the power supply system can operate reliably.
[0030] Depend on Figure 2As shown in the figure, protection device Rp shows that if IGBT device T is on, current can flow from terminal A through D1, T, and D3 to point B, or from terminal B through D2, T, and D4 to point A. If IGBT device T is off, the switch is open. This shows that protection device Rp is a bidirectionally controllable electronic switch.
[0031] Busbar protection principle:
[0032] Converter short circuit is divided into two situations: device short circuit and bus capacitor short circuit. If the converter device short circuits, the bus current will surge; if the converter bus capacitor short circuits, the capacitor current will surge. Figure 3 Taking the photovoltaic side DC / DC converter short-circuit protection as an example, the DC bus protection method is explained. Bus protection devices Rp1, Rp2, Rp3 and Rp4 are set on the positive and negative bus bars and bus capacitors on the DC side of the converter, and current detection elements are set at the same time to measure the current i of the positive and negative bus bars and the positive and negative bus capacitors. Ps ,i Ms ,i PCs and i MCs When the module is operating normally, the protection devices Rp1, Rp2, Rp3 and Rp4 are turned on, that is, the IGBT device is turned on.
[0033] The busbar protection device operates as follows:
[0034] If the current i Ps >i set , or i Ms >i set , indicating that the module device is short-circuited, disconnect Rp1 and Rp4;
[0035] If the current i PCs >i set , or i MCs >i set , indicating busbar capacitor failure, disconnect Rp2 and Rp3;
[0036] In addition, if the module needs to be repaired, Rp1 and Rp4 can be disconnected. Disconnecting the protection device Rp here means providing a shutdown signal to its IGBT device.
[0037] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced within the present invention.
[0038] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment have also been appropriately combined to form other implementation methods that are easy for those skilled in the art to understand.
Claims
1. A self-consistent energy supply and protection device for a railway traction power supply station, comprising a photovoltaic module, a lithium battery pack, a first DC / DC converter, a second DC / DC converter, a load-side DC / AC converter, a grid-side AC / DC converter, a converter protection device Rp1, a converter protection device Rp2, a converter protection device Rp3, a converter protection device Rp4, a bus capacitor Cp1, a bus capacitor Cp2, a bus capacitor Cm1, and a bus capacitor Cm2, characterized in that: The photovoltaic module is connected to the input port 4 of the DC / DC converter 1, the port 1 of the DC / DC converter 1 is connected to the converter protection device Rp1, the other end of the converter protection device Rp1 is connected to the converter protection device Rp2, the DC positive bus P, the converter protection device Rp3 and the converter protection device Rp4, the converter protection device Rp3 is connected to the port 1 of the load-side DC / AC converter, the other end of the converter protection device Rp2 is connected to the bus capacitor Cp1, the other end of the bus capacitor Cp1 is connected to the bus capacitor Cm1, the bus capacitor Cm2, the bus capacitor Cp2, the port 3 of the DC / DC converter 1, the load-side ... Port 2 of the C / AC converter and the neutral line N, the other end of the bus capacitor Cm1 is connected to the converter protection device Rp5, the other end of the converter protection device Rp5 is connected to the converter protection device Rp6, the converter protection device Rp7, the converter protection device Rp8 and the negative bus M, the other end of the converter protection device Rp7 is connected to the other end of the bus capacitor Cm2, the other end of the converter protection device Rp8 is connected to port 3 of the load-side DC / AC converter, port 4 of the load-side DC / AC converter is connected to the traction substation load, the other end of the converter protection device Rp6 is connected to port 4 of DC / DC converter 1, and the lithium battery The group is connected to the input port 4 of the DC / DC converter 2, the port 1 of the DC / DC converter 2 is connected to the converter protection device Rp9, the other end of the converter protection device Rp9 is connected to the converter protection device Rp10, the DC positive bus P, the converter protection device Rp11 and the converter protection device Rp12, the converter protection device Rp10 is connected to the port 1 of the load-side DC / AC converter, the other end of the converter protection device Rp11 is connected to the bus capacitor Cp3, the other end of the bus capacitor Cp3 is connected to the bus capacitor Cm3, the bus capacitor Cm4, the bus capacitor Cp4, the port 3 of the DC / DC converter 2, and the grid-side DC Port 2 of the DC / AC converter and the neutral line N, the other end of the bus capacitor Cm3 is connected to the converter protection device Rp13, the other end of the converter protection device Rp13 is connected to the converter protection device Rp14, the converter protection device Rp15, the converter protection device Rp16 and the negative bus M, the other end of the converter protection device Rp15 is connected to the other end of the bus capacitor Cm4, the other end of the converter protection device Rp16 is connected to port 3 of the grid-side DC / AC converter, port 4 of the grid-side DC / AC converter is connected to the traction substation load, and the other end of the converter protection device Rp14 is connected to port 4 of DC / DC converter 2.
2. The self-consistent energy supply and protection device for a railway traction power supply station according to claim 1, characterized in that: The converter protection device Rp1 includes a diode D1, a diode D2, a diode D3, a diode D4 and an IGBT device T. The anode of the diode D1 is connected to the cathode of the diode D4 and the input terminal A, the cathode of the diode D1 is connected to the cathode of the diode D2 and the drain of the IGBT device T, the source of the IGBT device T is connected to the anode of the diode D3 and the anode of the diode D4, and the anode of the diode D2 is connected to the cathode of the diode D3 and the output terminal B.
3. The self-consistent energy supply and protection device for a railway traction power supply station according to claim 2, characterized in that: Converter protection devices Rp1-Rp16 have the same structure.
4. The self-consistent energy supply and protection device for a railway traction power supply station according to claim 2, characterized in that: The IGBT device T is an insulated gate bipolar transistor.