28results about "Power supply lines" patented technology

Embodiments of the present application provide a kind of rail transit traction power supply system flexible mutual aid topology structure and its control method, belong to rail transit power supply technical field.The topology structure includes: traction power supply system, including multiple traction power supply subarea and corresponding main station;Three-port power electronic converter, first AC port and second AC port are connected to corresponding traction power supply subarea respectively, the third AC port of three-port power electronic converter is connected to city distribution network;Power mutual aid dispatching center, through communication link with three-port power electronic converter, city grid and traction power supply system connection, for collecting the multi-source data of city grid and traction power supply system, and based on multi-source data, three-port power electronic converter is controlled.The present application scheme realizes the electric energy two-way flexible mutual aid between rail transit traction power supply system and city grid, improves distributed photovoltaic consumption capacity and promotes grid collaborative operation stability.

The application discloses a real-time dynamic cloud capacity algorithm for a transformer of a traction power supply system, and particularly compares the load power of left and right power supply arms with the rated power of left and right windings of the transformer in real time to determine whether expansion is needed and how to expand. The algorithm uses power compensation resources such as the left and right windings of the transformer, the left and right windings of adjacent transformers and energy storage devices, and based on the compensation strategy of priority levels of the power compensation resources, the algorithm calculates the compensation power values that the power compensation resources should provide at the moment, controls the corresponding energy-saving devices to output corresponding compensation power in real time according to the compensation power values, and completes real-time dynamic expansion of the transformer. With the algorithm, the traction substation does not need to replace a transformer with large capacity, but only needs to use existing high-power power electronic energy-saving devices to realize real-time dynamic expansion of the transformer of the traction substation through cloud algorithm.

This application belongs to the field of rail transit technology, and particularly relates to a train over-phase control method and system. It includes: real-time monitoring of over-phase signals and acquisition of train speed signals; determining whether the medium-voltage support of the train traction system inverter is available; when an over-phase signal is detected, the medium-voltage support of the train traction system inverter is available, and the train speed exceeds a first speed threshold, generating a state transition signal; controlling the train traction system inverter to switch to regenerative braking mode based on the state transition signal, and controlling the train traction system rectifier to stop working after the state transition signal continues for a first time threshold; when the train main circuit breaker is detected to be closed, controlling the train traction system rectifier to restart; and controlling the train traction system inverter to exit regenerative braking mode after the train traction system rectifier has stably operated in PWM rectification mode. This application achieves seamless medium-voltage transition by first supporting and then blocking the inverter.

A station building auxiliary power supply device (1) comprises: a power conversion unit (11) that is electrically connected to a contact wire (2), which supplies electric power to a railway vehicle (4), that is electrically connected to a power distribution line (103), to which a load (6) is connected, and that is capable of bidirectional conversion between first power, which is for the contact wire (2), and second power, which can be supplied to the load (6); an output mode setting unit (15) that sets, on the basis of whether or not the contact wire is in a power shortage state, an output mode indicating the direction in which the power conversion unit (11) outputs electric power; and a power conversion control unit (16) that controls the power conversion unit (11) according to the output mode set by the output mode setting unit (15), wherein when the contact wire is in a power shortage state, the output mode setting unit (15) sets the output mode to an emergency mode, in which the power conversion unit (11) converts the second power into the first power and supplies the converted first power to the contact wire (2).

The utility model discloses a railway overhead line system carrier cable paying-off pulley device which comprises an installation hook, a pulley and a pulley block. The thermal resistor deicing assembly is assembled on the rear side of the mounting hook and comprises an insulating mounting plate which is detachably mounted on the rear side of the mounting hook; according to the device, the whole set of device is hung to a cantilever through the detachable support, the carrier cable sequentially penetrates into an encircling channel formed by the first rotating roll shaft, the second rotating roll shaft, the main rotating roll shaft and the third rotating roll shaft, the connecting spring is pressed in a self-adaptive mode along with tension, and groove jumping is avoided; then the power supply body is started, current is transmitted to the heating resistor through the electric wire, the insulating spring flexibly transmits heat to the surface of the iced carrier cable, the ice layer melts while moving, and the friction and strand breakage risks are reduced; and the other group of thermal resistance deicing assemblies which are bisymmetrically arranged synchronously work, so that the left-right stress of the curve section is balanced, the device does not need to be manually knocked in the whole process, the skylight time is shortened, and the service life of a carrier cable is prolonged.

To provide a power supply system which achieves miniaturization and low cost and avoids an early failure.SOLUTION: A power supply system includes: a DC power supply 1; a power converter 2 for converting power outputted from the DC power supply 1 into prescribed power and outputting the power to a load; a converter control unit 5 for controlling operation of the power converter 2; a first life evaluation unit 7 for calculating a life consumption amount of the power converter 2 in a prescribed period based on at least one of temperature information of the power converter 2 and a control command value of the power converter 1; and a load management control unit 8 for generating a command value to the converter control unit 5 for adjusting output of the power converter 2 by using an integration value obtained by integrating the life consumption amount and a life plan which is previously set.SELECTED DRAWING: Figure 1

The present application relates to a rail transit catenary power supply load prediction and self-healing control method, and relates to the technical field of rail transit power supply prediction. Unfiltered high-frequency voltage signals, environmental stability indicators at corresponding time points and train position information are collected to screen stable sample data. The unfiltered high-frequency voltage signals are subjected to spatial mapping to generate fixed spatial point labels. Multi-scale time-frequency decomposition is performed to extract high-frequency structure feature vectors. A long-term feature baseline model is constructed, and a feature distance change rate is calculated to form a risk trend indicator. A spatial risk weight correction prediction load value is generated, and a self-healing control instruction is generated based on the corrected prediction load value. The dynamic coupling of structure state evolution and power supply load prediction is realized, the risk identification accuracy is improved, and the self-healing control capability of the power supply system is enhanced.

This invention discloses a ground-based hybrid energy storage system of lithium batteries and supercapacitors for urban rail transit, relating to the field of rail transit power supply and energy storage control technology. The system includes a traction substation, a train simulation device, and a hybrid energy storage device. The traction substation forms a DC bus, and the train simulation device simulates the operation of an urban rail train under acceleration, coasting, and deceleration conditions. The hybrid energy storage device includes a lithium battery energy storage unit, a supercapacitor energy storage unit, and corresponding bidirectional DC / DC converters, connected in parallel to the DC bus. The system is controlled based on the DC bus voltage threshold. Through the synergistic effect of the voltage outer loop, filtered power distribution, and current inner loop, it replenishes energy to the bus during train acceleration and absorbs regenerated energy during train braking, thereby suppressing bus voltage fluctuations. The system has a clear structure and well-defined control logic, making it suitable for verification and research of hybrid energy storage systems for urban rail transit in a laboratory environment.

The present invention provides a power supply device capable of establishing a redundant commercial power supply system for supplying power to a load. [Solution] The power supply device comprises: a second power converter whose primary side is connected to a power supply circuit and which, as the voltage of the power supply circuit rises, transforms the voltage value of the output power of the power supply circuit to a predetermined voltage value to charge the second storage battery; a second storage battery connected to the secondary side of the second power converter and charged by the output power from the second power converter; a third power converter connected to the secondary side of the second storage battery and which supplies the charging power of the second storage battery to the load; and a second contactor whose primary side is connected to the third power converter via a second transformer and whose secondary side is connected to the load and the first contactor. When the first contactor is open and the second contactor is closed, the second storage battery, the electric vehicle connected to the power supply circuit, the substation, or the power storage device supplies power to the load using the third power converter.

The embodiment of the application provides a kind of two-way interaction system and its control method for city rail virtual power plant, belong to the technical field of urban rail transit power supply.The system includes: centralized access unit, including photovoltaic power generation device, energy storage device and bidirectional power electronic conversion device;One side of bidirectional power electronic conversion device is connected to urban rail transit medium voltage alternating current power supply network, and the other side is connected to urban distribution network;Photovoltaic power generation device and energy storage device are respectively connected to urban rail transit medium voltage alternating current power supply network through interface;Protection and isolation device is arranged between centralized access unit and the medium voltage alternating current power supply network of urban rail transit;State perception and communication unit obtains operating data, and uses operating data for scheduling of two-way power interaction channel.The application scheme realizes local circulation of photovoltaic and renewable energy and independent regulation of active and reactive power, improves new energy consumption capacity and power grid support capacity under the premise of guaranteeing the safety boundary of driving power supply.

The application discloses a railway flexible power supply device and an automatic neutral section passing method thereof. The method comprises the following steps: detecting the train running state and the track section occupation state at a specified position of a track, generating a state signal and sending the state signal to a flexible neutral section passing control system; collecting voltage and current signals of a traction network and a neutral section, and sending the collected voltage and current signals to the flexible neutral section passing control system; pre-processing the voltage and current signals to obtain processed electric signals; switching the control mode of the railway flexible power supply device based on the state signal and the processed electric signals; and adjusting the voltage amplitude and phase of the neutral section according to the corresponding control mode, and smoothly switching the train power supply from the current power supply arm of the traction network to a target power supply arm. The method can realize flexible automatic neutral section passing, and solves the problems of temporary shutdown of the traction system, current and voltage impact and arc between the pantograph and the catenary caused by switching.

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.

The invention relates to a vibration damper (10), (50) for connecting to an overhead line system and to an overhead line system comprising at least one vibration damper (10), (50). The vibration damper (10), (50) is connected at least indirectly to at least one contact wire (2) and / or at least one support cable (3) of the overhead line system, and the vibration damper (10), (50) has a guide device (12), at least two parts (14), (16), namely a first (14) and a second (16) part which can be moved relative to each other along the guide device (12), and at least one damping component (18).

This application relates to a centralized multi-traction substation flexible power supply system and control method. The system includes: a centralized back-to-back converter cluster deployed in regional substations or reserved corridors, with its three-phase rectifier side connected to the public power grid and its single-phase inverter side connected to a single-phase AC ring network, and its DC bus connected in parallel with energy storage units; the high-voltage sides of multiple traction substations connected to this single-phase AC ring network; and a global energy manager used to collect real-time data on load, regenerative energy, ring network voltage, and energy storage status of each traction substation, and based on this, generate converter power commands, energy storage charging and discharging commands, and inter-station power allocation commands to achieve coordinated and optimized scheduling of the entire system. Through a centralized architecture and global optimized control, this system solves the problems of difficult retrofitting, high cost, low regenerative energy utilization, and insufficient reliability associated with decentralized deployments, achieving negative sequence management, elimination of phase separation, efficient cross-station energy utilization, and improved power supply reliability.

This utility model belongs to the technical field of electrified railway catenary erection. It discloses a forged boltless integral dropper, including a boltless load-bearing cable clamp and a boltless contact wire clamp. The boltless load-bearing cable clamp includes a first movable part and a second movable part, which are centrally symmetrically arranged. Both the first and second movable parts are provided with limiting grooves and limiting protrusions to ensure overall structural stability. This utility model uses the aforementioned forged boltless integral dropper, eliminating the need for bolts in the overall structure. Through its integrated self-contained structure, it ensures the structural stability of the dropper and reduces maintenance costs.

This application discloses a control method, device, storage medium, and electronic equipment for a range-extended traction system, applied in the field of rail vehicle technology. The method includes: real-time acquisition of traction power supply system network data and train operation data; prediction of traction load for the next scheduling period based on the network data and train operation data; generation of an optimization function and constraint boundaries matching the train operating conditions based on the prediction results; and generation of the optimal control configuration for the energy storage device and power conversion device based on the optimization function and constraint boundaries. Using this method, multi-dimensional optimization of system safety, operating costs, and regenerative energy utilization can be achieved while ensuring train safety.

The invention relates to a method (100a; 100b) for operating a stationary energy supply system (10) for electrically powered vehicles (12). The method (100a; 100b) provides that information of the first kind concerning an operating characteristic of an energy storage device (14) of an electrically powered vehicle (12) is acquired (102). The acquired (102) information of the first kind is transmitted (104) to a central data processing device (16) via a programming interface. Based on the transmitted (104) information of the first kind, information of the second kind concerning a target operating state of said energy storage device (14) of the vehicle (12) is determined (106). The information of the second kind is transmitted from the central data processing device (16) to said vehicle (12) via the programming interface (104).The transfer of electrical energy between the energy storage device (14) and the stationary power supply system (10) is then controlled on the basis of second-type information (108).

The application discloses a modular multilevel converter for a city rail flexible power supply system and a control method, belongs to the technical field of electrified railway flexible traction power supply, discloses the converter and the topology structure of a multilevel cross type submodule constituting the converter, the converter can quickly clear the DC side fault under the operating conditions of no blocking and blocking, can simplify the cascade structure of the modular multilevel converter under the same voltage level, facilitates the maintenance of the modular multilevel converter, and the total cost of the device, the total cost of the conduction loss and the total cost of the modular multilevel converter of the converter are all minimum, and the converter has superior economy. In addition, the application further proposes a control method suitable for the modular multilevel converter, the control process is simple, and the output voltage waveform is close to sine.

This invention provides a self-powered, all-solid-state rail potential limiting device and its control method, relating to the field of electrified rail transit technology. The device includes a fully sealed protective housing and housed within the housing a self-powered module, an all-solid-state switch module, an intelligent main control module, and an isolation drive and heat dissipation module. The device is electrically connected to the rail via a rail connection cable and to the integrated grounding grid via a grounding down conductor. The isolation drive and heat dissipation module is positioned between the intelligent main control module and the all-solid-state switch module. The intelligent main control module is electrically connected to the all-solid-state switch module, the self-powered module, and the isolation drive and heat dissipation module. The self-powered module converts the potential difference signal collected by the isolation drive and heat dissipation module into DC power to supply power to the intelligent main control module and the isolation drive and heat dissipation module. This invention solves the problems of traditional devices relying on external power supply and the difficulty of energy acquisition in passive operating conditions under long tunnels.

The DC power supply device according to the invention comprises a transformer (1) having a primary side (5) and a secondary side (6), a diode rectifier (2) whose input side is connected to the secondary side (6) of the transformer (1), an inverter (3) whose output side is connected to the secondary side (6) of the transformer (1), and a controller (4). The inverter (3) is controlled by the controller (4) and generates reactive power and / or harmonics on the secondary side (6) of the transformer (1) so as to regulate a DC voltage on the output side of the diode rectifier (2) to a target value. The controller (4) receives at an input side at least one DC signal output by the diode rectifier (2) and controls the inverter (3) using the at least one DC signal.

The present invention relates to a system and method for reducing stray current caused by power supply return current of subway running rail, which is suitable for the power supply system of track return line adopted in DC power-supplied subway trains. By adopting parallel-connected connection branches composed of inductors, supercapacitors, IGBT switches, contactors, etc., and intelligently controlling the conduction and flow direction of current, and effectively filtering the harmonic components of return current, it can effectively reduce the leakage of harmonic components of stray current caused by harmonics from inverter switching circuits of trains to the outside of the running rail itself, and prevent electrochemical corrosion damage to other facilities and equipment.

The application discloses a train operation state-based energy management method for a mass transit energy storage device, which comprises the following steps: S1, setting an initial charging threshold and an initial discharging threshold, and ensuring that the initial charging threshold is always higher than the initial discharging threshold; S2, acquiring a train power sum and judging a train operation state according to the train power sum; and S3, formulating an energy storage energy management strategy according to the train operation state. The train operation state-based energy management method for the mass transit energy storage device can improve the charging and discharging thresholds when the train is being pulled, so that the energy storage system can be timely discharged, and the problems of the energy storage system being unable to be timely discharged and the energy storage system being unbalancedly utilized and having poor energy-saving effects are effectively avoided.

This invention discloses a traction network interconnection system and its control method and equipment, belonging to the field of rail transit. When the voltage value of the DC traction network exceeds the specified DC voltage range, the target transmission power can be determined based on the amount by which the DC traction network voltage exceeds the specified DC voltage range and the load conditions of the AC traction network. Conversely, when the voltage value of the DC traction network does not exceed the specified DC voltage range, the target transmission power can be determined based on the adjustable range of the DC traction network voltage within the specified DC voltage range and the load conditions of the AC traction network. This not only ensures the voltage reliability of the DC traction network but also assists in absorbing regenerative energy from the AC traction network or provides power compensation for the AC traction network within its capacity. Thus, it simultaneously considers the voltage reliability of the DC traction network, the timely recovery of regenerative energy, and the power compensation for the AC traction network.

The present application relates to MMC multi-level cross type sub-module topology and its urban rail flexible power supply system, and belongs to the technical field of electrified railway flexible traction power supply.The present application discloses the sub-module topology structure, which comprises five switch tube combinations and four capacitors, each switch tube combination comprises two IGBT tubes, compared with the prior art, the sub-module proposed by the present application can quickly clear the DC side fault under the non-locking operation condition and the locking operation condition, and simultaneously has the lowest device cost and conduction loss cost of a single sub-module, and has superior economy.In addition, the urban rail flexible traction power supply system disclosed by the present application can realize bidirectional energy flow by using the modular multilevel converter composed of the above-mentioned sub-modules, and the medium voltage DC bus is arranged, which is beneficial to the expansion of the power supply range, the increase of the power supply capacity and the reduction of the power supply cost.