57 results about "Traction power supply" patented technology

The invention relates to an electrified railway traction power supply system which is low in investment, is smooth for obtaining a current and is convenient to maintain. Rail webs outside two steel rails of a rail are respectively provided with one insulating strip; then a power supply strip is respectively arranged outside each insulating strip; each vibration inductive switch is connected in series with a sound inductive switch and a light-operated inductive switch; one ends of the connected switches are connected to the power supply strips at one sides; the other ends of the connected switches are connected with feed lines; the power supply strips at the other sides are connected with return wires. Power receiving frames at a headstock side and a tailstock side of a train are in contact with the power supply strips; when the train passes through a zone, the vibration inductive switches are closed, the sound inductive switches are closed, the light-operated inductive switches are closed, the power supply strips in the zone supply power, the power receiving frames of the train obtain a current and the train runs; when the train runs into a next power supply zone, the next power supply section is powered on, and power supply is stopped in the power supply zone. The aims of low investment, smoothness for obtaining the current and convenience for maintenance are fulfilled.

The application discloses a fault ranging method in a 1-2 mode of a traction power supply system feeder breaker, relates to the technical field of electrified railway traction power supply, and converts the uplink and downlink feeder currents of a traction substation by means of the cross-link current of an AT substation and a partition substation, so that the first fault interval from the traction substation to the AT substation can also be subjected to fault ranging by the fault ranging principle of the cross-link current ratio method. The method simultaneously considers the difference between type I and type II substation, and the fault ranging precision of the first fault interval can be improved by using the method, the ranging error is controlled within a range of 250 meters, the fault point can be quickly positioned by operation and maintenance personnel when a fault occurs, the fault is timely disposed and the line is recovered to normal operation, and the method has important significance for guaranteeing the safe, stable and efficient operation of a railway transportation system.

The application discloses a kind of traction network impedance simulation system and control method based on voltage source converter, and main substation is simulated by three-phase transformer, and traction substation is simulated by single-phase transformer.Three-phase transformer steps down power supply voltage, and the voltage on the high-voltage side of the single-phase transformer of the traction substation group comes from the same two-phase voltage of the three-phase transformer, which supplies the traction network after stepping down the voltage. Among them, for the impedance simulation of the traction network, the movement of the train is equivalent to the change of the line impedance, and the VSC is used to simulate the impedance of the traction network. The VSC is used to realize the change of the impedance of the traction network on both sides of the train during the train operation. The VSC device is used to simulate the impedance of the traction network on both sides of the train during the train operation, and relevant researchers can use the invention to carry out experimental verification of the related theory of the new type of substation group bilateral traction power supply system, and promote the development of the new type of substation group bilateral traction power supply technology.

The present application relates to the technical field of rail transit power supply system, and proposes a kind of urban rail transit power supply substation main wiring system based on energy router, including medium voltage bus, at least one transformer, at least one energy router, at least one contact switch and low voltage bus;The medium voltage bus is segmented by contact switch;The high voltage side of transformer is connected to the medium voltage bus, and the low voltage side of transformer is connected with energy router;Energy router is provided with at least one AC port and at least one DC port, and contact switch is used to connect AC port or DC port between different energy routers.Through integrating traction and distribution system, civil space is saved.The main wiring structure of substation is optimized, the number of equipment and switch is reduced, the system investment cost is reduced, the performance of traction power supply system can be improved, the power flow of power supply system is controllable and adjustable through energy router, not only the output of transformer can be balanced, but also line loss can be effectively reduced.

This invention discloses a fault location method for a traction power supply system feeder circuit breaker in a 1-to-2 mode, relating to the field of electrified railway traction power supply technology. By converting the cross-connecting current between the AT substation and the section substation into the up and down feeder currents of the traction substation, the first fault interval from the traction substation to the AT substation can also be located using the cross-connecting current ratio method. This method also considers the differences between Type I and Type II substations. Using this method can improve the fault location accuracy of the first fault interval, controlling the location error within 250 meters. This ensures that maintenance personnel can quickly locate the fault point, promptly handle the fault, and restore normal line operation when a fault occurs, which is of great significance for ensuring the safe, stable, and efficient operation of the railway transportation system.

The application relates to a non-full-phase power supply line comprehensive protection method, system, device and medium, characterized in that: when it is determined that traction power supply line protection at a transformer substation side has started, current and voltage information of two phases at the transformer substation side is collected; a fault element starting moment is recorded, a plurality of maximum sampling values in the former half cycle and a plurality of maximum sampling values corresponding to the latter half cycle before the moment are extracted; whether the traction power supply line at the transformer substation side appears a ground fault or a phase-to-phase fault is judged according to the current and voltage information, the extracted maximum sampling values and a first criterion, a second criterion and a voltage auxiliary criterion which are constructed in advance, and whether protection export is determined, and the application can be widely applied in the field of power supply lines.

This utility model provides a railway traction power supply capacitor compensation module to improve power supply stability, relating to the field of capacitor compensation technology. It includes a support mounting frame and multiple compensation capacitors arranged in a row. The bottom of each compensation capacitor is fixedly connected to a base plate, with both sides of the base plate slidingly engaging with grooves on two track plates. Two L-shaped mounting plates are symmetrically welded to the bottom of the two track plates, and U-shaped positioning frames are slidably mounted through these L-shaped mounting plates. A drive rod is slidably mounted through a horizontal mounting rod by a spring push. A connecting rod rotatably connects the drive rod to the U-shaped positioning frame, and the first end of the drive rod slides through a horizontal support rod, with a rectangular handle fixedly connected to the first end of the drive rod. In this utility model, simply sliding the drive rod inwards and outwards causes the U-shaped positioning frame to slide up and down, engaging or disengaging with the base plate, locking or unlocking the compensation capacitor, facilitating convenient and quick assembly and disassembly of the compensation capacitor.

The application provides a simulation calculation method of a traction power supply system of urban rail transit, comprising the following steps: constructing a locomotive load model, establishing a locomotive operation state information table of a unified time section, combining the position of the locomotive with the position of a traction station in a line, and obtaining a topology structure analysis of different time sections; constructing a traction power supply system model, obtaining rated voltage, line length, line unit impedance and traction station position; simulating a plurality of locomotives starting from a vehicle depot and running from a first end of the line to a last end of the line, obtaining the power and position values of each locomotive according to the locomotive load model, and then substituting the power and position values into the traction power supply system model to complete power flow calculation of a DC traction network, and obtaining the current, voltage of the locomotive, bus voltage and feeder current values of the traction station; the application can simulate the power of the train under different operation states, and calculate the bus voltage and feeder current of each traction station of the traction power supply system.

This invention discloses a power regulation method and system for an intelligent traction power supply system; including: calculating real-time transfer power, and calculating compensation current in real time by combining power transfer error and negative sequence current; calculating current tracking value based on current inner loop command value and voltage synchronization signal; designing a feedforward-feedback composite controller to calculate feedforward compensation amount and feedback control amount respectively; calculating the total duty cycle of PWM modulation signal based on feedback control amount and feedforward compensation amount, and driving the railway power regulator to output the actual current value; the control method and system provided by this invention have low engineering implementation cost, are suitable for traction substation RPC application scenarios, and are easy to promote.

This invention provides a configuration method for urban rail transit ground energy storage systems based on energy coupling and co-evolution. The method includes: establishing an equivalent circuit for the system based on the load and line information of the DC traction power supply system, using the location and installed power of the traction substation where energy storage is installed as decision variables; dividing the daily train operation scenario into peak and off-peak periods based on passenger flow; determining the expression for the system energy saving amount under the daily typical scenario where energy storage is installed relative to the system without energy storage; simultaneously, using the installed energy storage capacity as a decision variable, establishing an optimal configuration model for the urban rail transit ground energy storage system considering energy storage charging and discharging losses; and solving the model using a genetic algorithm combined with a co-evolution strategy to obtain the optimal configuration results for energy storage installation location, installed power, and capacity. This invention considers the energy coupling between traction substations, trains, and energy storage, enabling precise matching of the dynamic energy demand of trains and achieving efficient utilization of overall system resources.

The application discloses a modeling method and device of a traction power supply system. The method comprises the following steps: using energy macro-expression modules to represent each component in the traction power supply system, so as to build a main circuit model, wherein each energy macro-expression module has an input port, an output port and a causal relationship; determining an adjustment path in the main circuit model according to a control target; and performing reverse step-by-step deduction according to the control target and the adjustment path, so as to deduce a control instruction required for realizing the control target. The application can accurately clarify the interaction relationship between each component, clearly represent the energy flow path of the system, and improve the simulation speed.

The application discloses a kind of energy management method and device of train traction power supply system, readable storage medium, comprising: obtaining the traction load power of train traction power supply system belonging train at target time, the energy supply parameter of multi-source energy supply equipment, the energy storage parameter of energy storage equipment, energy supply parameter includes the output power of regenerative energy equipment in multi-source energy supply equipment at target time, energy storage parameter includes the capacity of electrolytic cell, ammonia synthesis device in energy storage equipment;Based on traction load power, energy supply parameter, energy storage parameter and the power balance constraint condition of train traction power supply system, with the maximum of target function corresponding to the overall energy yield of train traction power supply system as optimization target, predict the working power of electrolytic cell and ammonia synthesis device at target time, target function is based on the mathematical model and yield, cost of energy supply equipment and energy storage equipment at corresponding time and construction;Based on the working power of electrolytic cell and ammonia synthesis device at target time, the energy management of this system is executed.

This invention discloses a train position determination method and device to address the problem that existing positioning technologies cannot accurately calculate and distinguish the positions of multiple trains. The method includes: determining the position domains of the first train and the second train based on the historical positions of a first train located within the overhead contact line section of the traction power supply system and a second train newly entering the overhead contact line section; traversing the first and second train position domains to obtain at least one candidate position combination; determining the electrical operating parameters of the traction power supply system corresponding to each candidate position combination based on the first and second candidate positions in each candidate position combination; and determining the real-time positions of the first and second trains based on the first and second candidate positions corresponding to candidate position combinations whose electrical operating parameters meet preset target parameter conditions. This method significantly improves the accuracy and reliability of train position positioning.

This disclosure provides a parameter calibration method, a resistive-capacitive circuit, a traction power supply system, and a train, relating to the field of rail vehicle technology. The parameter calibration method includes: performing spectral analysis on the overvoltage signal of an on-board voltage transformer to obtain multiple oscillation frequency components of the overvoltage signal; based on the suppression effect of the first resistive-capacitive sub-circuit on the multiple oscillation frequency components in the overvoltage signal, determining a first constraint condition between the first resistance value and the first capacitance value of the first resistive-capacitive sub-circuit through network function analysis; based on the first constraint condition, analyzing the influence of the first resistive-capacitive sub-circuit on the electrical characteristics of the on-board voltage transformer to determine the first resistance value and the first capacitance value; and based on the impedance suppression effect of the second resistive-capacitive sub-circuit, determining the second resistance value and the second capacitance value of the second resistive-capacitive sub-circuit through equivalent impedance analysis.

This invention provides a method and system for predicting the state of a substation affected by stray current fluctuations. Based on train operation data, a digital twin traction power supply system model integrating train dynamics and traction arc characteristics is used to generate a stray current disturbance signal containing transient pulse components. Based on earth resistivity distribution data and the stray current disturbance signal, a three-dimensional finite element underground stray current diffusion model with adaptive mesh refinement is used to obtain the current component flowing into the substation grounding grid. Based on the current component and substation operation data, a digital twin model of the substation's electromagnetic-thermal coupling, explicitly modeled with the core lamination structure and oil-cooled convection channel, is used to make predictions, obtaining the substation's bias magnetization prediction results and temperature rise prediction results. This invention comprehensively considers multi-source heterogeneous data and combines simulation technology for the entire chain of subway traction, earth, and power grid substations, which can improve the risk prediction results of substations.

The present disclosure relates to the technical field of electrified railway traction power supply, and provides a fault location method and system using reclosing current of an AT traction network. The method comprises: when a reclosing operation is detected, obtaining circuit parameters of a target rail, a target contact line and a target negative feeder after reclosing, and determining whether a permanent short-circuit fault occurs in the target AT traction network; in the case where it is determined that a permanent short-circuit fault occurs, determining a fault type of the permanent short-circuit fault according to the circuit parameters; and calculating a short-circuit fault distance corresponding to the fault type according to a preset calculation strategy, the fault type and the target parameters. The present disclosure can greatly improve the accuracy and practicability of short-circuit fault location.

The utility model discloses a kind of full-closed railway traction power supply cable sheath protector, including nitrogen conveyor and multiple sealed boxes, four cable sheath protector bodies are fixed with equal intervals in the sealed box, the lower end side of the sealed box is connected with joint, the nitrogen conveyor is connected in the one end of joint by nitrogen conveying pipe. The utility model is adjusted by effective protection and real-time monitoring, not only have good explosion-proof and heat insulation performance, but also can enhance the structural strength of sealed box, further improve its reliability, full-closed railway traction power supply cable sheath protector can also reduce the damage of external factors to the internal elements of protector, prolong its service life, reduce maintenance cost and replacement frequency, by nitrogen conveyor automatic adjustment, ensure that protector is always in the best working condition, real-time monitoring and adjustment mechanism, greatly improve the stability and reliability of system, reduce the probability of failure.

The present application is a railway catenary infrared thermal defect identification and early warning method and system, belonging to the field of railway traction power supply system monitoring technology. The method includes the following steps: collecting catenary component images; inputting an improved YOLOv8 deep learning network for target detection, identifying and locating catenary components; based on the boundary box of the catenary component, performing image segmentation on the corresponding region and extracting a temperature matrix to realize quantitative characterization of the catenary component temperature field; based on the sequence of the temperature matrix, using a continuous frame statistical analysis method to distinguish the temperature changes of the same component in multiple images, and distinguishing between persistent thermal defects and transient interference through time series correlation analysis; when a thermal defect is determined, outputting complete early warning information including the defect location, type, temperature and early warning level. The present application realizes end-to-end intelligent processing from the original infrared image to accurate early warning information, significantly improving the accuracy and reliability of railway catenary thermal defect detection.

The utility model discloses a subway direct current traction power supply equipment protection insulating terrace structure relates to subway power supply safety technical field, including insulating terrace surface, the surface of insulating terrace surface is coated with epoxy resin, and the bottom of insulating terrace surface is provided with bakelite insulating plate, and the below of bakelite insulating plate is sequentially provided with moisture-proof board and water passing board, the water passing board is located the below of moisture-proof board, and the bottom of water passing board is installed with frame board. The utility model discloses, when using, the bottom of bakelite insulating plate is provided with high temperature resistance layer and heat insulating layer, and high temperature resistance layer can make insulating board still keep good insulating property during high temperature use, and the setting of heat insulating layer insulates the heat above insulating board, prevents the moisture below moisture-proof board from heat influence equipment normal resistance electricity, and heat insulating layer can also prevent the equipment below moisture-proof board from rusting and rotting, prolongs the service life of equipment, reduces the possible of equipment repair.

This invention discloses a method and device for determining the contact wire impedance of a traction power supply system, addressing the problems of equivalent circuit model mismatch, low identification accuracy, and poor robustness in existing technologies under complex vehicle-grid coupling operation scenarios. The method includes: acquiring voltage and current data during the operation of the traction power supply system; the voltage and current data includes traction substation voltage values, traction substation current values, section substation voltage values, and section substation current values; determining the load operating state of the contact wire based on the traction substation current values, section substation current values, and load operating state determination conditions corresponding to the power supply mode of the traction power supply system; filtering voltage and current data whose load operating state corresponds to a preset target operating state, obtaining filtered voltage and current data; and determining the contact wire impedance based on the filtered voltage and current data. This effectively improves the accuracy and robustness of the contact wire impedance.

This invention relates to the field of rail transit technology, providing a train digital simulation system, platform, and method for constructing the system. The system includes: a vehicle system model, a track model, and a traction power supply network model. The track model performs track simulation based on actual operating scenarios to obtain track parameters. The vehicle system model performs simulation calculations on the track parameters, control targets of each vehicle, and transmission efficiency of each vehicle to obtain the simulated traction power and simulated vehicle position. The traction power supply network model performs power flow calculation simulation based on the simulated traction power and simulated vehicle position to obtain the simulated voltage and simulated current of each node in the traction power supply network, and calculates the simulated energy consumption based on the simulated voltage and simulated current. This invention considers the information interaction between the vehicle system model, track model, and traction power supply network model, especially the coupling relationship between the power supply network and the train group, thereby enabling accurate simulation of energy consumption.

The application provides a design method for digital dynamic mode test simulation switch function, which uses a comprehensive measurement and control device to simulate different switches to realize the reconstruction self-healing function of the traction power supply system, a plurality of fixed value area configuration libraries are pre-established in the comprehensive measurement and control device for different power supply network topologies and self-healing processes, and the properties of all switches are completely defined in each library; scene initialization is completed by switching the fixed value area one key during the test, and the device simulates the logical behavior and action time of the switch according to the configuration properties, and all switches can be completely replaced by software, without physical wiring; through the means of "pre-configuration, fast switching, soft simulation and network interaction", the wiring complexity and configuration workload of the dynamic mode test are greatly reduced, the flexibility, accuracy and ability to cope with complex self-healing scenes of the test are improved, and an efficient platform is provided for the protection and control strategy verification of the traction power supply system.

The application provides a traction power supply fault positioning method and system for an electrified railway. A fault voltage transient signal is collected. A local measurement point and an opposite measurement point where an initial fault traveling wave first arrives are identified according to the fault voltage transient signal. Joint time-frequency analysis is performed on voltage waveforms of the local measurement point and the opposite measurement point to obtain a dominant oscillation frequency sequence. An equivalent propagation time difference of the fault traveling wave arriving at the local measurement point and the opposite measurement point is identified according to a distribution characteristic of the dominant oscillation frequency sequence. A first estimated distance and a second estimated distance of a fault point are determined based on a known wave speed of a traction network line and the equivalent propagation time difference. A fault positioning mode is determined according to a sum of the first and second estimated distances and an actual total length of a line. A fault position point of the traction power supply of the electrified railway is identified based on the fault positioning mode. The technical solution provided by the application can achieve accurate positioning of the fault position point of the traction power supply of the electrified railway under the influence of complex transient waveforms.

1. The name of the design product: traction contact rail (2). 2. The use of the design product: the design product is used in the overhead contact rail of the electrified highway traction power supply system. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view. 5. Other circumstances that need to be explained: the design product is a non-fixed length product.

The application provides a method for preventing circulation of rail transit traction power supply, which comprises the following steps: S1. verifying whether the rail transit traction power supply system has external droop characteristics according to a power flow calculation principle, and the verification process is as follows: (1) based on the power flow calculation principle, the output active and reactive power expressions of any traction substation i can be obtained, that is, formula (1) and formula (2). The method for preventing circulation of rail transit traction power supply provided by the application can suppress the generation of circulation, so as to solve the problems of system current distortion, increase of system additional loss and influence on the overall performance of the system.

This invention belongs to the field of AC electrified railway traction power supply technology, specifically relating to an energy interconnection and conversion system and control method for energy interconnection between a new energy power station and a railway traction power supply system. This method provides an energy conversion topology and energy interconnection control method for energy interconnection between a new energy power station and a railway traction power supply system. It enables the new energy power station to supply power to the railway traction power supply system, achieving both the provision of clean energy from large-capacity new energy sources to the railway traction power supply system, improving the green energy consumption level of railway traction power supply, and solving the problem of insufficient grid absorption capacity commonly faced by new energy power stations. Simultaneously, the regenerative braking energy of the railway traction load can be fed back to the new energy power station with good power quality, solving the problem of poor power quality and lack of economic benefits when the remaining new energy (surplus electricity) and regenerative braking energy after traction load absorption are fed back to the grid through existing traction substations.

The application discloses a rail transit new energy power supply conversion control method and device, equipment and medium. It relates to the technical field of power electronics and traction power supply control. Through obtaining traffic situation information and electrical quantity information, the traction load dynamics, energy storage state and power grid working condition are unified into a hybrid prediction model, solving the defect that a single model cannot predict the change of impact load. In the multi-objective cost function, the grid comprehensive strength index term is introduced, and its weight coefficient is negatively correlated with the grid comprehensive strength index, thereby realizing real-time dynamic matching of the prediction model optimization target and the grid strength, overcoming the bottleneck that fixed parameters or physical models are difficult to balance accuracy and adaptability under complex working conditions, and ensuring voltage stability and power response under strong and weak grid wide range change scenarios, with stronger predictability and adaptability.

The application discloses a bidirectional converter applied to a city rail transit power supply system and a control method, and relates to the technical field of city rail transit direct-current traction power supply. The bidirectional converter comprises a transformer, a converter, a rectifying unit and a control unit. The alternating current end of the converter and the alternating current end of the rectifying unit are connected to an alternating current power grid through the transformer. The direct current end of the converter and the direct current end of the rectifying unit are connected with a direct current contact net. The rectifying unit is used for converting alternating current of the alternating current power grid into direct current and supplying power for the direct current contact net. The control unit is used for monitoring contact net voltage of the direct current contact net, determining whether the contact net voltage is higher than a preset power feedback starting voltage threshold value, and when the contact net voltage is higher than the power feedback starting voltage threshold value, controlling the converter to deliver electric energy at the direct current contact net to the alternating current power grid to perform power feedback to the alternating current power grid. The above scheme can improve the electric energy utilization rate of the rail transit system.