371 results about "Railway electrification system" patented technology

The invention provides a real-time dynamic harmonic detection method and system for a traction power supply system, and relates to the technical field of harmonic detection, and the detection method comprises the following steps: collecting a voltage signal of the traction power supply system in real time, and dynamically tracking fundamental frequency fluctuation through a phase-locked loop technology; dynamically adjusting the data window length of FFT analysis; dynamically adjusting a frequency spectrum calculation kernel of the FFT; carrying out linear compensation on the detected harmonic phase; taking the preliminarily detected harmonic parameter as an initial value, and iteratively updating the harmonic parameter until convergence by minimizing a signal reconstruction error; dynamically adjusting a sampling interval according to the fundamental frequency fluctuation, and carrying out anti-aliasing processing by adopting a filter with a variable cut-off frequency; and constructing a matrix model containing a fundamental frequency fluctuation parameter, and calculating a real harmonic parameter through a least square method. According to the method, the detection defect of the fixed window FFT during frequency fluctuation can be systematically solved, and high-reliability real-time data support is provided for harmonic resonance suppression of the electrified railway.

The invention discloses a comprehensive online monitoring system for a high-voltage cable of an electrified railway, and particularly relates to the technical field of cable monitoring. The clustering analysis module divides similar groups based on factory and use environment data; the prediction mode selection module evaluates the stability and nonlinearity degree of the environmental data, and selects an optimal prediction method to predict the environmental data; the threshold value judgment module selects a fixed or dynamic threshold value to judge a fault through comparison with similar group data; the dynamic adjustment module optimizes a fault threshold based on historical data and improves the detection precision; the alarm module triggers early warning when the monitoring data exceed a threshold value; according to the method, the operation mode of the cable is accurately matched, the monitoring precision is improved, misjudgment caused by a single data source is avoided, it is ensured that the optimal prediction method is always used under different environmental conditions, the prediction precision of future environmental data is improved, and reliable support is provided for fault judgment.

The invention provides an enhanced YOLOv10-based electrified railway overhead line system insulator defect detection method, system and equipment and a medium. The method comprises the following steps: acquiring an overhead line system insulator image of a target scene through a shooting device and automatic inspection equipment; marking contact network insulators and defects in the contact network insulator image by using a marking tool, and dividing the marked image into a training set and a verification set according to a preset proportion; performing model training on the basis of the training set and the verification set, and introducing a lightweight OfficientViT module, a Wise-IoU loss function and a knowledge distillation technology in the training process to obtain a contact network insulator defect detection model based on YOLOv10; and inputting the obtained image of the to-be-detected overhead line system insulator into the overhead line system insulator defect detection model to obtain a defect detection result. The method provided by the invention improves the accuracy and efficiency of insulator defect detection.

The invention belongs to the technical field of image processing, and particularly relates to a contact network defect identification method based on multiple modalities, which comprises the following steps of: 1, acquiring a visible light image sequence and an infrared thermal imaging image sequence of a target contact network, and carrying out time alignment and temperature calibration to obtain a unified reference frame sequence and a thermal vision consistency label set; 2, constructing a structure change graph and an overheat candidate graph in the obtained unified reference frame sequence, calling a cross-modal physical semantic autocatalysis recombination algorithm, and taking a generated thermal vision consistency label set as a constraint; and step 3, taking the output fusion evidence body as input, combining the thermal vision consistency label set and the reversible channel audit record to verify the candidate area, obtaining a defect target, and outputting a defect category and a defect position. According to the method, the precision and stability of defect detection are improved, the traceability of the result is also realized, and a reliable guarantee is provided for intelligent operation and maintenance of the electrified railway overhead line system.

The invention relates to the technical field of alternating current electrified railway power supply, in particular to a negative sequence treatment method and system for an electrified railway traction substation, and the system comprises a step-down isolation transformer and an SVG compensation subsystem. The primary side of the step-down isolation transformer is used for being connected with the high-voltage wire inlet side of a three-phase power grid of a traction substation, and three-phase medium-voltage electricity is formed after step-down isolation and connected to a three-phase medium-voltage bus. The SVG compensation subsystem is used for being connected to a three-phase medium-voltage bus; the SVG compensation subsystem is used for outputting negative sequence compensation current; the direction of the negative-sequence compensation current is opposite to that of the negative-sequence current generated by the traction load, and the negative-sequence compensation current and the load current generated by the traction load counteract each other, so that the treatment of the negative-sequence current is realized.

The invention belongs to the technical field of protector type selection optimization, and particularly relates to a cable line metal sheath protector type selection optimization method based on induced overvoltage, which comprises the following steps of: acquiring operation state data and environment state data of a cable line, analyzing and diagnosing the state of the cable line, and if the state of the cable line is abnormal, performing early warning. If the state of the cable line is normal, obtaining an initial overvoltage; correcting the initial overvoltage based on the intermittent load of the electrified railway to obtain corrected overvoltage; evaluating the insulation performance and the overvoltage hazard level of the metal sheath of each area of the current cable line; determining basic model selection indexes of the protectors based on the overvoltage hazard levels, and screening candidate protectors based on the basic model selection indexes; and performing performance evaluation on the candidate protectors, and determining an optimal protector. According to the method, the optimal protector is determined through short-term and long-term performance evaluation under multi-round screening and simulation working conditions, and reliable operation of a cable line under different working conditions is ensured.

The invention discloses an electrified railway contact line icing influence analysis method, which comprises the following steps of: obtaining key parameters such as a collision coefficient and a freezing coefficient of a water drop and a contact line in an icing calculation process by analyzing a line surrounding flow field of an overhead line system and researching heat balance of the surface of the contact line; and meanwhile, carrying out grid analysis on environmental parameters and icing boundaries so as to establish a time-varying meteorological numerical model of the contact line. By means of a contact line icing numerical model, the influence of the temperature (T), the liquid water content (LWC), the median volume diameter (MVD) and the wind speed (Vp) on contact line icing evolution is analyzed through a control variable method. Therefore, an important basis is provided for contact line icing prediction, ice prevention and ice removal in the future.

The invention, which relates to the technical field of electrified railway operation and maintenance, discloses a deep-learning-based intelligent laser clearing system for an overhead line system, comprising a time sequence baseline re-calibration module, an illumination sudden change identification module, an energy overshoot prediction module, an energy risk constraint module, a heat accumulation weakening module and a steady-state closed-loop regulation and control module. The method comprises the following steps: establishing a unified event time baseline, collecting an illumination intensity sequence of an overhead line system operation environment, constructing a non-uniform sampling re-calibration matrix, eliminating clock skew and sensing lag through time re-calibration, and obtaining a stable time sequence reference. According to the method, the illumination time sequence precision is improved through re-calibration and residual analysis, the feedforward model is combined to predict overshoot, the attitude parameters limit the high-risk interval, the dynamic threshold value and the phase compensation inhibit the laser abnormal wave crest, the thermal damage risk is reduced, and the intelligence, the safety and the stability of the difference clearing operation are improved.

The utility model relates to the technical field of current acquisition and monitoring, and provides an electrified railway traction backflow acquisition device, which comprises a first shell internally integrated with a data collection unit; the second shell is arranged on the live cable, and a self-energy-taking unit is integrated in the second shell and used for taking electricity from the live cable in an induction mode; the at least two third shells are arranged on the to-be-detected cable in a one-to-one correspondence mode, and current acquisition sensors are arranged in the third shells and used for acquiring current parameters in the to-be-detected cable; the second shell and the third shell are both connected with the first shell. According to the utility model, the data collection unit, the self-energy-taking unit and the current acquisition sensor are respectively arranged in the three shells, so that the installation and the monitoring are more convenient, and the device can be flexibly applied to different positions of a traction backflow path of an electrified railway, and has strong portability; a plurality of current acquisition sensors can be used at the same time to detect a plurality of cables, and the monitoring efficiency of the cables is improved.

The invention discloses a RPC traction power supply harmonic suppression method based on robust H-infinity control, and relates to the technical field of high-speed railway electric power, and the method comprises the steps: analyzing the electric energy quality of a railway traction power supply system; constructing a vehicle-network coupled traction power supply system module engineering model; building a quadruple RPC model based on robust H infinity control; and constructing a locomotive simulation model and designing a six-working-condition parallel APF model to carry out electric energy quality analysis. According to the RPC traction power supply harmonic suppression method based on robust H-infinity control provided by the invention, harmonic suppression is carried out on the traction network by applying the RPC based on robust H-infinity control, so that the operation safety of the electrified railway is promoted to be improved, and a real solution is provided for further enhancing the reliable operation of the electrified railway traction power supply system.

The invention relates to a three-dimensional multi-source stray current interference characteristic analysis and identification method based on wavelet analysis. When a buried pipeline is subjected to electrical interference of different interference sources (such as high-voltage transmission line current, high-voltage direct-current grounding electrode grounding current, electrified railway and high-speed railway current, urban rail transit current and natural environment such as tidal interference current), the buried pipeline is subjected to electrical interference. And identifying and analyzing the pipe-to-ground potential and alternating current voltage fluctuation characteristics (amplitude characteristics and frequency characteristics) under stray current interference, judging the influence of interference sources on the safety and stability of the buried steel pipeline, solving the problems of analysis, identification and processing of multiple interference sources in the existing complex environment, improving the monitoring and treatment level of the interference sources of the buried steel pipeline, and improving the safety and reliability of the buried steel pipeline. Safe and reliable operation of the pipeline is ensured.

The invention provides a 27.5 kV-grade thermoplastic polypropylene cable material for an electrified railway and a preparation method of the 27.5 kV-grade thermoplastic polypropylene cable material, and belongs to the technical field of cable insulating materials. Comprising the following components: 50-60% of modified polypropylene; 15-20% of ethylene propylene rubber; 10 to 12% of polyethylene; 5%-6% of mica powder; 1-2.3% of an antioxidant; 2 to 3 percent of glass fiber and 0.1 to 0.3 percent of rare earth. The prepared modified polypropylene insulating material has more excellent high temperature resistance, thermal shock resistance and water tree resistance, has the advantage of being more environmentally friendly and low temperature resistance compared with an XLPE cable material, and is more suitable for the field of electrified railways.

The invention relates to the technical field of railway contact networks, in particular to an electrified railway anti-icing contact network and a control system.The device comprises a contact network wire and a brim flow guide structure arranged on the contact network wire in a sleeving mode; the upper part of the catenary wire is an arc-shaped surface, the middle part of the catenary wire is provided with a dovetail groove, and the lower part of the catenary wire is a conductive surface; the shape of the upper portion of the brim diversion structure is consistent with that of the upper portion of the contact network wire, the middle of the brim diversion structure extends towards the two sides to form brim-shaped diversion plates, and the brim-shaped diversion plates are used for guiding airflow to drive freezing rain water drops to slide towards the two sides so as to avoid a conductive surface; the brim-shaped flow guide plate is positioned below the dovetail groove; and after the cap-brim-shaped guide plate is sleeved on the overhead line system wire, the conductive surface can be in contact with the pantograph. Structural innovation and collaborative prevention and control logic are integrated, and the problems that an existing electrified railway anti-icing scheme is single, limited in function and insufficient in adaptability are solved.

The invention relates to the field of railway track traffic, in particular to an electrified traction backflow proportion testing system and method. Comprising a power supply system and a backflow comprehensive control system which are connected, the backflow comprehensive control system comprises a control module, a backflow current monitoring module and a backflow state display module, and the backflow current monitoring module and the backflow state display module are respectively connected with the control module; the power supply system comprises a current source module and a current source control module which are connected. According to the electrified railway system backflow proportion testing system, accurate testing of the grounding grid backflow proportion of a traction substation of a newly-built railway can be achieved, the system can accurately monitor and record the grounding grid backflow proportion in real time, powerful guarantee is provided for safety and stability of railway engineering, and through the system, the system can be used for testing the grounding grid backflow proportion of the traction substation of the newly-built railway. The actual operation state of the traction backflow system can be known, and potential problems can be found and solved in time, so that long-term stable operation of a railway system is ensured.

The invention discloses an energy storage cophase power supply system based on a V-connection traction transformer, a control method and a storage medium, and belongs to the technical field of electrified railway power supply. The energy storage in-phase power supply system comprises a V-connection traction transformer, three single-phase compensation devices, an energy storage device and a coordination control device. The primary side of the V-connection traction transformer is connected with a three-phase power supply, and any port of the secondary side is connected with a traction load; aC ends of the three single-phase compensation devices are respectively connected to different ports of the secondary side, and DC ends are connected in parallel to a DC bus; the energy storage device is also connected in parallel with the DC bus. The coordination control device collects current and voltage signals and controls operation of the devices. The system has the functions of energy storage and in-phase power supply, and solves the problems of large traction load fluctuation of a traditional electrified railway traction substation, power return caused by train regenerative braking, train over-electricity split-phase stall and electric energy quality management.

The invention discloses an electrified railway conductive busbar aluminum profile and a manufacturing method thereof. The aluminum profile is composed of, by mass, 0.5%-0.6% of Mg, 0.45%-0.55% of Si, 0.05%-0.15% of RE, smaller than or equal to 0.2% of Fe and the balance Al and inevitable impurities, and RE is mixed rare earth. The manufacturing method sequentially comprises the steps of smelting and preparing aluminum alloy liquid, blowing and refining, online grain refining, degassing in a degassing box, filtering in a filtering box, semi-continuous casting, high-temperature homogenizing treatment, extrusion forming, online quenching, stretching and straightening, saw cutting and aging heat treatment. By scientifically designing the composition of the aluminum profile and carrying out deep purification treatment on the aluminum alloy liquid, the problem of mutual restriction among strength, elasticity modulus and conductivity is solved, meanwhile, the strength, elasticity modulus and conductivity of the aluminum profile are improved, and the aluminum profile has excellent comprehensive performance and is suitable for popularization and application. And the requirements of rapid development of high-speed trains such as subways, high-speed rails and maglev trains are met.

The invention discloses an electrified railway hybrid electric energy quality treatment device which comprises a balancing transformer, a TCLC branch and an active electric energy quality regulator. The balancing transformer comprises a primary side end and a secondary side end, the primary side end is connected with a three-phase public power grid in the traction substation, the secondary side end is provided with a series winding used for being connected with an alpha-phase traction network and a closed-loop triangular winding used for being connected with a beta-phase traction network, and the closed-loop triangular winding is provided with a first self-coupling tap and a second self-coupling tap; the first self-coupling tap, the second self-coupling tap and the remaining vertexes are connected into the TCLC branch in parallel; and the other end of the TCLC branch is connected with an IGBT switch bridge arm of the active power quality regulator. The invention further provides an electrified railway hybrid power quality management control method. According to the device cooperation control method provided by the invention, the overall cost and the installation space of the device are effectively reduced on the premise that the problems of negative sequence, low power factor and harmonic waves existing in the traction substation are comprehensively treated.

The invention discloses a dynamic carbon emission evaluation method for an electrified railway. The method comprises the following steps: establishing a carbon emission model of power supply equipment in a traction power supply system of the electrified railway; establishing carbon emission models of the electric locomotive under different working conditions; calculating the active power of the electric locomotive and the traction power supply system at the t moment; according to the carbon emission models of the traction power supply system and the electric locomotive and the active power of the electric locomotive and the traction power supply system at the t moment, calculating the carbon flow rates of the traction power supply system and the electric locomotive under the working condition at the t moment; and summing all the carbon flow rates to obtain a t-moment carbon emission evaluation result. The method has the beneficial effects that carbon emission evaluation is carried out on the electric locomotive and the traction power supply system according to the operation condition of the electric locomotive, and the carbon emission dynamic state at each moment is reflected; the dynamic carbon emission evaluation result can provide decision guidance for decarburization measures of traction power supply system power supply equipment, an energy structure and an operation strategy, and low-carbon transformation of an electrified railway is facilitated.

The invention belongs to the technical field of electrified railway monitoring, and aims to provide a traction power supply system abnormity monitoring method. After the data are collected, the fluctuation range of the traction backflow branch current proportion of each branch is further obtained according to the collected data so as to carry out traction backflow branch current value abnormity monitoring on each branch, and real-time abnormity monitoring and abnormity early warning can be carried out on appointed performance parameter values of the grounding device. Refined analysis and correlation analysis of multi-dimensional data are achieved, data support can be provided for design or transformation of a traction backflow device and a grounding device for an operation and maintenance management department of the electrified railway, and long-term safe and stable operation of the electrified railway is guaranteed.

The invention relates to the technical field of traffic information engineering and control, in particular to a railway signal novel LED lamp control system and method, and the system comprises a DC power supply, a control unit, an interlocking machine, a transmission module, a DC voltage regulation and monitoring device, a main filament breakage alarm module and a DC LED lamp. The direct-current power supply, the control unit, the transmission module, the direct-current voltage regulating and monitoring device and the direct-current LED lamp are sequentially connected together, the control unit is connected with the interlocking machine, and the direct-current voltage regulating and monitoring device is connected with the main filament breakage alarm module; by adopting the filter circuit, the redundancy switching circuit and the power supply adjusting circuit, the bypass alternating current electrified railway traction current interference and the lighting interference of a common mode and a differential mode on the direct current LED lamp can be filtered out, wrong lighting is prevented, the redundancy switching circuit judges the current in a loop, the auxiliary LED lamp is switched to be lightened when the main LED lamp is broken, and the safety of the main LED lamp is ensured. The monitoring of the railway signal direct current LED lamp filament is realized.

The invention relates to the technical field of alternating-current traction bilateral power supply, in particular to an equivalent method of a bilateral traction power supply system. For a bilateral power supply traction power supply system, a vehicle-network-source looped network coupling mathematical model is established based on a coupling relationship between a power system and the traction power supply system and an equivalent strategy of a power network. According to the established model, system circulation calculation method research is carried out during bilateral power supply of two traction stations and no-load operation of a traction network, a related calculation formula is deduced, and a power supply energy flow coupling mechanism of a multi-power-supply looped network is analyzed. Compared with a traditional equivalent model, the model provided by the invention more accurately and clearly explores the range and degree of the influence of the equalizing current on the three-phase power system, and can provide great help for subsequent research of the influence of electrified railway bilateral power supply on the power system and realization of independent innovation of a bilateral power supply system.

The present invention relates to the technical field of electrified railway traction power supply. Disclosed are an electrified railway energy router system and a control method therefor. A back-to-back inverter BTB consists of an inverter BTBα on an α-phase circuit side and an inverter BTBβ on a β-phase circuit side, and direct current sides of a cross-phase inverter IBI, the inverter BTBα and the inverter BTBβ are all connected to a direct current bus DCB to form a star structure. A controller CC monitors and analyzes traction load operation parameters by means of a bidirectional signal port and controls renewable energy output power in a direct current source DS, charging and discharging of an energy storage device, and working states of the cross-phase inverter IBI and the back-to-back inverter BTB. The problems of high cost and difficulty in engineering applications of traditional back-to-back structured railway energy routers are solved.

The invention relates to the technical field of electrified railway catenaries, and provides an intelligent monitoring system and method for a catenary section insulator, and the method comprises the steps: collecting a visible light video, converting the visible light video into an HSV color space, and extracting the contour of a pantograph slide plate through combining the material and shape features; an optical flow method is adopted to track the contact track, the number of effective contact times is counted, and voltage and temperature data are synchronized to analyze performance changes before and after contact; and finally, a relation graph model is constructed, trend prediction and abnormal early warning of the state of the section insulator are realized, so that the operation state of the section insulator in the overhead line system can be continuously monitored in real time, advance perception and trend pre-judgment of faults are realized, and the safety and reliability of a railway system are effectively improved.

The utility model provides a marine transportation packaging structure for concrete pillars of an electrified railway, which is used for solving the problem that the surfaces of the concrete pillars are extremely easy to damage in the marine transportation process. An electrified railway concrete pillar marine transportation packaging structure comprises a plurality of limiting wooden frames, the limiting wooden frames are arranged on two parallel concrete pillars in a sleeving mode, steel belt grooves are formed in the limiting wooden frames in the circumferential direction, steel belts are arranged in the steel belt grooves, the steel belts are connected end to end to surround the limiting wooden frames, and cloth liners are arranged between the limiting wooden frames and the concrete pillars. Isosceles triangle wooden wedges are arranged between the concrete supporting columns, the bevel edges of the wooden wedges abut against the side walls of the concrete supporting columns, the bottom edges of the wooden wedges abut against the limiting wooden frames, fixing belts are wound around the concrete supporting columns, and the two ends of the fixing belts are fixed to the two sides of the container respectively. According to the utility model, the concrete support can be limited from shaking in the container, and the stability in the transportation process is ensured.

The invention discloses a method, a system, a medium, equipment and a product for evaluating the landslide risk of a photovoltaic site along a railway in the technical field of electrified railway new energy development. The method comprises the following steps: carrying out Pearson correlation analysis on a railway line photovoltaic site landslide risk preliminary evaluation factor of a target site to obtain a railway line photovoltaic site landslide risk evaluation factor; according to the landslide risk evaluation factor of the photovoltaic site along the railway and the project location sample data set, carrying out landslide prediction by using a BP neural network to obtain a prediction result; and obtaining a contribution value of each photovoltaic site landslide risk evaluation factor along the railway to a prediction result in a prediction process by using an SHAP model, and obtaining a photovoltaic site landslide risk evaluation result along the railway. Aiming at the scene of photovoltaic along the railway, the problem of difficulty in site selection and the like is solved, and the photovoltaic construction efficiency and quality along the railway can be effectively improved.

The utility model discloses an electric split-phase protection device for a contact network, and relates to the field of electrified railway traction power supply systems. The system is composed of a signal acquisition unit, an interphase fault identification unit, a fault removal unit, a power supply unit, a man-machine interface unit and an information interaction unit. An analog quantity acquisition circuit of the signal acquisition unit is connected with the interphase fault identification unit through a high-speed PCIE bus. The switching value acquisition circuit, the electric split-phase fault identification unit, the fault removal unit, the information interaction unit and the man-machine interface unit of the signal acquisition unit are connected together through the CAN bus, and the power supply unit supplies power to each unit through a device backboard power supply loop. The device is used for identifying and removing the phase-to-phase fault of the overhead line system, can improve the identification rate of the phase-to-phase fault, shortens the fault removal time, and achieves the quick removal of the fault, thereby avoiding the large-area power failure of a traction power supply system, and guaranteeing the normal operation of an electric locomotive.

The present invention discloses an on-train short-wave antenna for the electrified railway environment. The antenna as a whole is set as a circular closed loop and arranged inside the "electromagnetic space" formed by the metal car body, the high-voltage catenary and the rail, overcoming the risk of electric shock to personnel and equipment caused by the high-voltage electric field environment of the electrified railway catenary to short-wave electromagnetic emission, breaking through the interference of the magnetic field characteristics of the electrified railway electromagnetic environment to short-wave communication, greatly improving the gain performance of the short-wave antenna, and finally realizing the deployment of short-wave communication on the train in the electrified railway environment, enriching the technical means of railway vehicle-ground communication.

This invention discloses a constant tension overhead line guiding device for electrified railway catenary, relating to the field of railway catenary technology. It includes: a high-position mounting frame fixedly connected to a constant tension overhead line vehicle; a mounting plate fixed to the top of the high-position mounting frame; and multiple opposing guide components mounted on the mounting plate. It also includes: a support cylinder rotatably connected to the guide components; an adjusting arm slidably sleeved inside the support cylinder; and a monitoring unit connected to the support cylinder for detecting tilting of cables passing through the guide components. Through the monitoring unit, this invention can detect in real time whether the cables passing through the guide components are tilting. When the cable tilts, it generates a lateral force on the support cylinder, causing the adjusting arm to slide within the support cylinder. Furthermore, by controlling the action of the adjusting unit, the position of the adjusting arm, support cylinder, and guide components is adjusted, achieving real-time correction of the cable's direction.

The present application relates to the technical field of electrified railway control, and discloses a phase control closing method and a heavy haul locomotive circuit breaker, the method comprising: step one, establishing equivalent mathematical models for the heavy haul locomotive, traction substation, AT substation and traction network; step two, establishing a vehicle-network-station simulation model based on a MATALB / Simulink simulation platform; step three, obtaining the influence of different line loads on phase selection closing according to the vehicle-network-station simulation model; and step four, determining a phase control closing scheme and conducting test verification. The phase control closing and opening method of the heavy haul locomotive circuit breaker with the above structure can establish equivalent mathematical models for the heavy haul locomotive, traction substation, AT substation and traction network, and then establish a vehicle-network-station simulation model, analyze the influence of different line loads on phase selection closing, and determine a phase selection closing scheme according to the breakdown characteristics of the circuit breaker and the analysis results. The phase selection closing scheme determined through test verification can achieve the purpose of reducing the overvoltage of the closing system.

The present invention discloses an equivalent method for an electrified railway through-power supply system. This method uses two-port circuit theory and Carson theory to equate the ring network power supply structure under the through-power supply system to an open power supply network. This method accurately analyzes the power flow distribution when different types of high-voltage power supply lines, trains operating in multiple working conditions on the traction network, and new energy power generation units are connected to the traction network. This method facilitates the theoretical derivation of power distribution, power loss, voltage at each node, and current distribution patterns in the network, laying a theoretical foundation for the electrical characteristic analysis of complex through-power supply systems. The method includes the following steps: S1, determining the equivalent circuit of the high-voltage power supply line; S2, determining the equivalent circuit of the traction network; S3, determining the equivalent circuit of the entire through-power supply system; and S4, performing equivalent transformation of the equivalent circuit of the ring network of the through-power supply system.