259 results about "Traction substation" patented technology

The invention relates to a railway traction substation state monitoring method and system, equipment and a medium. The monitoring method comprises the following steps: acquiring real-time monitoring data of the equipment in a railway traction substation; performing data preprocessing on the real-time monitoring data to obtain a preprocessed monitoring data set, performing protocol identification, and converting heterogeneous data in the monitoring data set into structured data according to a preset protocol template library; based on the structured data, time-frequency domain characteristic parameters of the equipment are extracted, and a multi-dimensional characteristic matrix is constructed; inputting the multi-dimensional feature matrix into a pre-trained hybrid diagnosis model, and generating an equipment health degree score and a fault probability value; according to the health degree score and the fault probability value, generating an early warning instruction in combination with a dynamic threshold algorithm; and generating a priority maintenance strategy through a maintenance strategy optimization model based on the early warning instruction and the equipment maintenance resource constraint condition. According to the invention, accurate perception and intelligent decision making of the equipment state are realized in a multi-source heterogeneous data environment.

The invention discloses a traveling wave fault positioning method and system for a full parallel AT power supply traction network, and belongs to the field of railway traction power supply system relay protection. The method specifically comprises the following steps: after the full parallel AT power supply traction network has a fault, firstly, analyzing the characteristics of an AT station fault initial current traveling wave, and determining a fault line by using the amplitude of the AT station fault initial current traveling wave; then, the polarity of the fault initial current traveling wave and the fault initial voltage traveling wave of the AT station fault line is used for judging the fault direction; and finally, calculating the fault distance by selecting a positive direction or negative direction distance measurement formula according to the moment when the fault initial voltage traveling wave arrives at the outlet of the traction substation, the AT station and the subarea station and the fault direction information. According to the method, only fault initial traveling wave information is utilized, wave head identification is not needed, wave velocity parameters are not needed, and simulation results show that the positioning method not only can provide fault distance, but also can provide fault line information, is convenient for maintainers to quickly find fault points, and has extremely high robustness and accuracy.

The invention relates to the technical field of electromagnetic interference signal processing, and provides a grading method and system for partial discharge live detection electromagnetic interference signals of a traction substation. The method and the device are used for solving the problems of difficulty in accurately classifying various types of electromagnetic interference signals, difficulty in adapting to changes under different working conditions, poor adaptive adjustment capability and insufficient adaptability in the prior art. The method comprises the following steps: constructing a dynamic graph model to process an electromagnetic interference signal data stream, and generating fusion data; carrying out real-time anomaly detection on the data, and carrying out adaptive context awareness classification in combination with reinforcement learning and a deep belief network; extracting space-time spectrum characteristics of the electromagnetic interference signals, constructing an interactive expert system, generating target parameter configuration, and obtaining a preliminary grading result; and adjusting each algorithm parameter to generate a final grading result. According to the technical scheme provided by the invention, an efficient and intelligent electromagnetic interference signal processing method is provided, the accuracy and the reliability of a grading result are ensured, and the efficiency and the effect of electromagnetic environment management are improved.

The invention provides a traction power supply system control method based on multi-objective optimization, and the method comprises the following steps: S1, determining an initial control variable of a traction system, the initial control variable comprising converter power of an alpha power supply side and a beta power supply side of the traction power supply system and train braking resistor dissipation power of the alpha power supply side, the initial control variable is used as input to construct a regenerative braking energy MPC prediction model; s2, predicting a state variable of a next moment based on a regenerative braking energy MPC prediction model, wherein the state variable comprises output power of a traction substation, total dissipation power of a brake resistor, output power of an energy storage system and a charge state of the energy storage system; and S3, constructing a multi-objective optimization function based on the state variable at the next moment, converting the multi-objective optimization function into a quadratic programming form for solving to obtain a control variable sequence, and taking a first item of the control variable sequence as control input to control the traction power supply system to work.

The invention relates to the field of operation and maintenance of railway traction substation circuit breakers, and discloses a multi-dimensional self-adaptive intelligent operation and maintenance system and method. The system comprises a circuit breaker multi-dimensional database and an intelligent operation and maintenance terminal. The database integrates data in multiple aspects, for example, a service large database covers information of the whole process from design to operation, a real-time monitoring database obtains working states from multiple systems and dynamically monitors the working states, and a database related to operation safety and emergency disposal is further included. The terminal realizes multiple functions by means of mass data, including accurate fault diagnosis and early warning, comprehensive health assessment, reliability and risk analysis, residual life prediction, scientific maintenance strategy formulation, operation risk assessment, fault self-inspection and reconstruction self-healing and emergency disposal assistance. The application method runs through all links from data acquisition to emergency disposal, and realizes full-life-cycle intelligent operation and maintenance. The intelligent level of operation and maintenance is improved, railway power supply safety is guaranteed, and wide applicability and popularization value are achieved.

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 relates to the technical field of operation state detection of traction substation equipment, and discloses an intelligent image recognition method and system for the operation state of the traction substation equipment and a medium, and the method comprises the steps: obtaining initial image data of the operation state of the substation equipment; preprocessing the initial image data to obtain intermediate image data; obtaining a sample actual label from the intermediate image data, and taking the intermediate image data and the corresponding sample actual label as a group of training samples so as to form a training sample set; constructing a state recognition model based on a deep learning neural network, optimizing weights and thresholds of a feature extraction unit and a recognition unit based on a particle swarm algorithm in combination with a training sample set, and finally completing training of the state recognition model; and detecting the intermediate image data of the operation state of the substation equipment through the trained state recognition model. Through the method provided by the invention, the workload of operation and maintenance personnel is reduced, the inspection efficiency is improved, and the risk occurrence probability is reduced.

The invention discloses a zero-carbon intelligent electrified highway transportation system, and relates to the technical field of highway transportation green low-carbon and new energy automobiles, and the system comprises the following components: an energy supply and management module which supplies power through the combination of an external power grid and a renewable energy power generation micro-grid, carries out the voltage reduction and rectification of a traction substation, and outputs the power to a power supply module; a renewable energy power supply proportion dynamic adjustment formula is utilized, and the total central control platform dynamically adjusts the power supply proportion according to the power consumption demand and the energy reserve, so that stable power supply is guaranteed; through close cooperation of the energy supply and management module and the vehicle energy utilization module, electric power is obtained from the overhead contact line system in real time in the driving process, the problems that a new energy heavy truck is short in driving mileage and low in energy supplementing efficiency are effectively solved, the transportation efficiency is greatly improved, the requirement for long-distance freight can be better met, and the transportation cost is reduced. And the road freight industry is powerfully promoted to develop in a more efficient and more convenient direction, and the competitiveness of transportation enterprises in the market is remarkably enhanced.

The invention discloses a distributed cooperative voltage control method for a hybrid flexible traction substation group, and aims at solving the problems of output voltage cooperation, no-load circulating current suppression and multi-substation load distribution during networking operation of a plurality of hybrid flexible traction substations (HFTSS). Rapid synchronization of output voltage phases of the substations is achieved by introducing an average consistency algorithm, and nearby distribution of train loads among the traction substations is achieved by combining self-adaptive virtual impedance. According to the method, the capacity of the hybrid flexible traction substation for coping with the dynamic change of the external power grid voltage phase can be effectively enhanced, the loss of a contact network is reduced, the regenerative braking energy utilization efficiency is improved, and a feasible path is provided for large-scale application of a low-cost hybrid flexible traction power supply system and improvement of a cooperative control technology system.

The invention discloses a lithium battery alternating current and direct current integrated power supply device and a control method. The lithium battery alternating current and direct current integrated power supply device comprises a high-frequency switch rectifier module, a direct current converter, a coordination controller, an anti-reverse diode, a communication unit and a lithium battery system, the high-frequency switch rectifier modules are one-way AC / DC modules, the number of the high-frequency switch rectifier modules is one, the number of the high-frequency switch rectifier modules is one, the number of the high-frequency switch rectifier modules is one, the number of the high-frequency switch rectifier modules is one, the high-frequency switch rectifier modules are one-way AC / The modular design is adopted, capacity expansion and maintenance are convenient, parallel mixed use of different types of batteries is supported, the flexibility and reliability of the system are improved, a traditional lead-acid battery scheme can be effectively replaced, the problems of large potential safety hazards, short service life, difficulty in capacity expansion and the like of series design are solved, the requirements of a power system for high reliability, intelligence and modularization are met, and the application prospect is wide. The method is suitable for railway traction substations, station communication machinery rooms, power plants and other scenes.

The method is applied to the fields of train regenerative braking energy utilization, stray current and rail potential treatment and the like in electrified rail transit, especially urban rail transit. The invention provides a direct-current traction power supply system capable of reducing the energy storage capacity of a super capacitor of urban rail transit, which is combined with a super capacitor energy storage device of the urban rail transit and supplies power to a power electronic device for treating stray current and rail potential by utilizing regenerative braking energy of a train. The super-capacitor energy storage device has the following advantages that on one hand, the energy storage capacity of the super-capacitor bank in the super-capacitor energy storage device between train braking and traction can be reduced, and the utilization efficiency of regenerative braking energy stored by the super-capacitor bank is improved; on the other hand, the problems of stray current, rail potential and the like in the system can be solved from the source, and the power supply distance of a traction substation is remarkably increased. Therefore, the direct-current traction power supply system is of great significance to green and safe operation of urban rail transit.

The present invention relates to the technical field of traction power supply, and in particular to a method and device for calculating the carbon emission liability of a direct-current traction power supply system. The method comprises: obtaining real-time electrical information of a plurality of traction substations in a direct-current traction power supply system and train position information, to establish a node position relationship of any line between any adjacent traction substations, and then using the real-time electrical information to obtain the power flow of each branch and the power flow of each node; on the basis of a preset power flow tracing algorithm, the power flow of each branch and the power flow of each node, carrying out power flow tracing to determine the carbon emission intensity of a power supply node; and on the basis of the carbon emission intensity of the power supply node, calculating the carbon emission liability transmitted on each branch and the carbon emission liability of each node, so as to obtain a carbon emission liability calculation result of the direct-current traction power supply system in real-time operation. Thus, the present invention solves the problems in existing carbon emission liability accounting of ignoring the characteristics of energy prosumers of trains, having difficulty in real-time power flow tracking, and the like.

The invention provides a traction substation grounding grid breakpoint fault diagnosis method, and belongs to the technical field of traction substation grounding grids, and the method comprises the steps: firstly constructing an equivalent simulation circuit grid model of a traction substation grounding grid, and simulating the pilot frequency AC excitation current of traction backflow; grounding grid potential distribution data are collected in different working states, and normalization is carried out to form training samples. And then constructing a fuzzy neural network fault diagnosis model, and training to obtain the fault diagnosis capability. And finally, collecting surface potential data of a to-be-detected traction substation grounding grid, normalizing the surface potential data, and inputting the surface potential data into the diagnosis model to judge whether a breakpoint fault occurs or not and the position of the breakpoint fault. According to the traction substation grounding grid breakpoint fault diagnosis method provided by the invention, the advanced electromagnetic field theory, fuzzy logic and neural network technologies are fully fused, the defects of the existing diagnosis method are overcome, and the technical problems of insufficient diagnosis precision and efficiency in the aspect of grounding grid fault diagnosis in the prior art are solved.

The invention discloses a high-speed rail traction transformer capacity optimization design which comprises the following steps: collecting and analyzing actually measured load data of a high-speed rail traction substation, and constructing a typical load curve; and based on the typical load curve, establishing a transformer temperature rise model by using an exponential equation, and calculating the traction transformer winding hot-spot temperature and life loss. And then, optimizing the capacity of the traction transformer according to a calculation result so as to improve the capacity utilization rate and the economical efficiency of the transformer. The optimized transformer is subjected to field test to verify the performance of the transformer in actual operation, including but not limited to capacity utilization rate, temperature rise condition, energy efficiency ratio and the like. And according to a field test result, necessary adjustment and improvement are carried out on an optimization scheme. According to the method, the accuracy of the temperature rise model is ensured by determining the temperature rise relation between the winding hot-spot temperature and the top-layer oil temperature and solving the steady-state temperature rise by using the index equation. Meanwhile, the influence of the environment temperature change on the temperature rise is considered, and the applicability and accuracy of the model are improved.

The invention discloses a traction power supply system voltage mutual fuse monitoring method, system and device, relates to the technical field of traction power supply systems, and solves the problems that the existing traction power supply integrated automation system cannot monitor the continuous fusing process of a fuse, resulting in that the PT voltage is lower than the actual operation voltage, and the safety is poor. According to the technical scheme, the method is characterized in that according to the power supply characteristics of a traction substation, the operation condition of a voltage transformer of the substation is automatically recognized, and a fuse monitoring method of the voltage transformer is automatically selected according to the operation condition of the voltage transformer; and monitoring and early warning of incomplete fusing of the voltage transformer fuse are realized.

The invention discloses a multi-bus traction substation self-healing reconstruction failure power restoration method and system, and the method comprises the steps: carrying out the self-healing reconstruction action in a substation, rejecting to open a low-voltage side circuit breaker of a bus fault power supply, blocking a corresponding switch through a GOOSE signal, presetting a switch number fixed value, and carrying out the step-by-step opening of the circuit breaker with the switch number meeting the criterion through time delay. The high-voltage side circuit breaker of the standby power supply is switched on after time delay, the low-voltage side circuit breaker of the standby power supply is switched on step by step after time delay if no locking signal exists, self-healing reconstruction action is performed in the substation, the low-voltage side circuit breaker of the bus standby power supply is rejected to be switched on, and the circuit breaker with the switch number meeting the criterion is switched on step by step after time delay. The method has the advantages that when the self-healing action fails due to the action refusing fault in the self-healing reconstruction process in the substation, the bus cannot stop power supply recovery, the power supply range can be recovered to the maximum extent, power failure of a non-fault phase bus is avoided, equipment does not need to be newly added, and the method can be achieved through an existing protection device upgrading program.

The utility model discloses a traction substation outdoor hoisting device which comprises a base frame, a lifting plate is arranged in the upper end of the base frame in a sliding mode, an open groove is formed in the upper end of the lifting plate, an auxiliary fixing device is arranged on the side wall of the base frame, a sliding device is arranged in the open groove, and a hoisting rod is arranged at the lower end of the sliding device. A connecting base is arranged at the lower end of the hanging rod through a rotating device, a lifting device is arranged in the base frame and is in power connection with the lifting plate, and a clamping device is arranged on the connecting base. The utility model belongs to the technical field of outdoor hoisting of transformer substations, and particularly relates to an outdoor hoisting device for a traction transformer substation, which is used for solving the problems of inconvenience in fixation, low binding efficiency of power transformation equipment, unsafety in manual auxiliary butt joint during installation of the power transformation equipment and low efficiency during outdoor installation of the power transformation equipment for the traction transformer substation in the prior art.

The invention discloses a railway traction station load prediction method and system, relates to the technical field of load prediction, and is used for solving the technical problems that the accuracy of railway traction station load prediction is low and actual requirements cannot be met in the prior art. The railway traction station load prediction method comprises the following steps: acquiring load data of a railway traction station; the load data comprises a training set and a test set; decomposing the load data into a plurality of narrowband intrinsic mode functions by constructing variational optimization; parameters in the variation optimization process are optimized; constructing a prediction model for each narrowband intrinsic mode function, optimizing parameters of the prediction model, and training the prediction model through the training set; after the training is completed, obtaining a first prediction result through the prediction model by using the test set, and restoring the first prediction result into an original load data dimension; and superposing and reconstructing prediction results obtained by all the prediction models to obtain a final prediction result.

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 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.

A distributed grounding backflow monitoring system for a railway traction substation comprises an indoor equipment subsystem and an outdoor equipment subsystem. The outdoor equipment subsystem is composed of a plurality of centralized grounding box monitoring units and a plurality of voltage and integrity monitoring unit subordinate subsystems. The indoor equipment subsystem is arranged in a standard cabinet and comprises a man-machine interaction unit, a data storage and processing unit and a power supply module; the communication channel is mainly used for providing a channel for communication between subsystems, optical signals are selected, and electric signals can also be adopted. The utility model solves the problems of complex wiring, large work amount and large cable interference, and has the characteristics of convenient installation, modular layout and the like, an outdoor equipment power supply adopts an isolation transformer, a signal setting surge protector or an optical fiber, the safety influence of lightning stroke and overvoltage on indoor equipment is avoided, the overall power of the equipment is relatively large, and a regular polling mechanism is adopted, so that the safety of the equipment is ensured. The power consumption is reduced, the load is balanced, and the power configuration requirement is reduced.

The present invention discloses a main wiring structure of a hub traction substation, which includes two external power supplies and two groups of traction transformers. It also includes a switching unit, several feedback lines, and two independently arranged busbars. One group of busbars is powered by one power supply, and the other group of busbars is powered by the other power supply. Each group of busbars is configured with the same number of feeder lines to form two independent power supply devices that are physically isolated and electrically separated from each other; the feeder lines all pass through the switching unit (7) and the corresponding switches (8); switches (8) are provided on all the feeder lines to achieve switching between the two groups of power supply devices through the switching of the switches. The main wiring structure of the hub traction substation of the present invention sets two mutually independent power supply devices. Due to the achievement of physical isolation and electrical separation, when one group of devices fails or is struck by lightning, the other group of devices can be unaffected and quickly put into operation, thus restoring normal power supply and improving power supply reliability.

The application discloses a high-speed railway pantograph-catenary arc electromagnetic radiation interference modeling analysis method, constructs a pantograph-catenary arc-pantograph power supply system integrated model containing a traction substation model, a traction network model, a train traction transmission system model, a train-track return current grounding system model and a pantograph-catenary arc model; under a pantograph-off arc transient condition, arc current is obtained through simulation calculation; and based on the arc current, a relationship between arc radiation power and spatial equivalent electric field intensity is established to represent the influence of time-varying characteristics of traction network electrical parameters on pantograph-catenary arc electromagnetic radiation interference. Under the pantograph-off arc transient condition, the real-time changes of impedance and capacitive reactance parameters of the traction network are involved in the unified solution of arc current formation, radiation power evolution and spatial electric field intensity calculation, and meanwhile, key coupling factors of the train high-voltage system and the train-track grounding system are mainly considered, so that the accuracy and engineering applicability of pantograph-catenary arc electromagnetic radiation interference analysis are improved.

The invention belongs to the technical field of electrical monitoring, and particularly relates to a railway traction substation three-dimensional visual monitoring system, which comprises a data acquisition unit, a data processing unit and a data feedback interaction unit, and is characterized in that the data acquisition unit is used for acquiring working condition data of electrical equipment in a railway traction substation; comprising a fixed acquisition module and a mobile acquisition module; according to the invention, image information acquisition is carried out on dead corners which are difficult to cover by the fixed acquisition module through the mobile trolley, comprehensive coverage and full monitoring of the railway traction substation are realized under dynamic and static cooperation mutual verification, and the safety and reliability degree of information acquisition is improved; moreover, when the information acquisition devices corresponding to the fixed acquisition modules in part of the areas break down, the mobile trolley can be controlled to go to the fault area as a supplement, so that the blank of a monitoring network is filled, and the anti-risk capability of the whole railway traction substation monitoring system is improved.

The invention discloses a graphical fault distance measurement method and system, relates to the field of traction substation tripping fault mark distance measurement in the railway industry, and can read a fault report of a fault distance measurement device and constant value parameter configuration of the fault distance measurement device off line, and calculate and analyze a fault type, whether line current is balanced or not and a fault distance according to the data and parameters. And a result is graphically displayed, so that the distance measurement error range can be narrowed by modifying and verifying the constant value parameters, and the corrected constant value parameters are exported and stored, thereby achieving the purposes of facilitating fault analysis, improving the working efficiency and shortening the maintenance time. Maintenance personnel are helped to quickly find out fault points, timely process faults and recover normal operation of lines, and the method is very important for safe, reliable and efficient transportation of a railway system.

The present application relates to a method, system, equipment, and medium for monitoring the status of a railway traction substation. The monitoring method includes: obtaining real-time monitoring data of equipment in the railway traction substation; preprocessing the real-time monitoring data to obtain a preprocessed monitoring data set and performing protocol identification, and converting the heterogeneous data in the monitoring data set into structured data based on a preset protocol template library; extracting the time-frequency domain characteristic parameters of the equipment based on the structured data and constructing a multi-dimensional feature matrix; inputting the multi-dimensional feature matrix into a pre-trained hybrid diagnostic model to generate an equipment health score and a fault probability value; generating an early warning instruction based on the health score and the fault probability value in combination with a dynamic threshold algorithm; and generating a priority maintenance strategy based on the early warning instruction and the equipment maintenance resource constraints through a maintenance strategy optimization model. The present application realizes accurate perception and intelligent decision-making of equipment status in a multi-source heterogeneous data environment.

The utility model discloses a digital twin operation and maintenance data holographic sensing system for supporting a high-speed railway traction substation, which comprises a substation intelligent monitoring control system. A substation on-line monitoring subsystem, a substation dynamic ring measurement and control subsystem, a substation security monitoring subsystem, a substation unmanned aerial vehicle inspection system, a substation integrated automation system and a substation intelligent monitoring control workstation are respectively connected through a substation intelligent monitoring control switch. A one-way isolation device is arranged between the substation integrated automation system and the substation intelligent monitoring control switch and used for achieving one-way isolation when data of the substation integrated automation system is transmitted to the substation intelligent monitoring control system. The substation unmanned aerial vehicle inspection subsystem is connected with the substation intelligent monitoring switch through the substation wireless access security gateway; and the substation intelligent monitoring control system processes the accessed system data and transmits the processed data to the substation intelligent monitoring control workstation and the railway integrated data network.

The present invention discloses a method and system for calculating the power flow of a traction power supply system. Firstly, a holomorphic embedded power flow model of the traction power supply system is constructed, including constructing a holomorphic power flow model of the traction substation balance section and the locomotive load section nodes; secondly, the node voltage and current power series are approximately solved; finally, the power flow results are tested, so as to quickly and accurately obtain the power flow distribution of the traction power supply system.

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.