30results about How to "Extend power supply distance" patented technology

The invention discloses a system for reducing potential of a subway train track. The system for reducing the potential of the subway train track comprises a return line, a negative impedence converterand a switch unit which is used for connecting the return line with a running rail. The system for reducing the potential of the subway train track is applied to the existing subway rail transit direct current traction power supply system; by adjusting output impedance of the negative impedence converter, the impedance from a return point of a traction substation to a closed switch unit via the negative impedence converter and the return line is enabled to approach zero and then the current of a train on the running rail in this section is transferred to the return line so that the potentialof the closed switch unit approaches the potential of the return point of the traction substation. According to the system for reducing the potential of the subway train track, the track potential inthe existing system can be greatly reduced to greatly reduce stray current corrosion. The system for reducing the potential of the subway train track can also be used for reducing the track potentialof a track in a novel direct current traction power supply system based on direct current auto-transformer power supply or can be used for reducing the track potential of a track in an alternating current traction power supply system.

The invention relates to a rail transit negative voltage return DC power supply system. On the basis of the traditional DC power supply system, a negative voltage return line and a DC converter for realizing negative voltage return are added, and the negative voltage return line is used to replace the traditional DC power supply system. The return line of the running rail can greatly reduce or eliminate the stray stray currents in the traditional DC power supply system, and the negative impact of the running rail on the ground potential is too high, which can greatly reduce the loss of the power supply line and increase the DC traction substation. At the same time, the DC converter can also be used as an energy storage device for the regenerative braking energy of the train to improve the utilization efficiency of the regenerative braking energy of the DC power supply system and maintain the voltage stability of the rail transit DC power supply system.

The invention provides an AT traction network distributed power supply system and a control method, belonging to the technical field of electrified railway traction power supply. The traction side of the same-phase traction substation is connected to the traction busbar, and the traction busbar is connected to the AT traction network through the feeder. The central coordination controller controls the operation mode of the power generation device, and controls the power generation and reactive power distribution; it is mainly used to further extend the power supply distance of the same-phase AT traction network, as well as the distributed access and nearby consumption of new energy, so as to promote the green development of the railway system .

The invention discloses a POE power supply control device, comprising: an input module, a boost control module, a through switch, a central control module and an interface module, the boost control module includes a voltage comparison unit and a boost unit, and the interface module includes several interfaces , used to connect to the POE power receiving end; the voltage comparison unit judges whether to boost the voltage input by the input module; if so, enables the boost unit, and the boost unit outputs the boosted voltage to the interface module; if not, Then enable the pass-through switch, and the pass-through switch outputs the voltage to the interface module; when the central control module responds to the power management command sent by the voltage comparison unit, according to the connection status between the POE power receiving end and the interface module and the power application command sent by the POE power receiving end Performs power management on the interface module. The invention also discloses a POE power supply system. The embodiment of the present invention can effectively expand the power supply distance of the standard POE to realize the relay function; at the same time, it can allocate and manage the power to realize the Hub function.

The invention discloses an electrified railway traction power supply system, which belongs to the technical field of electrified railway traction power supply. It can effectively reduce phase separation. Including the traction substation SS, the catenary T and the rail R, wherein the catenary T and the rail R form a direct supply traction network, the traction substation SS supplies power to the traction cable TC through the traction bus TB, and supplies power to the negative feeder through the negative feed bus NB Feeder cable NC power supply; in subsection S i In the above, the traction cable TC and the catenary T are connected in parallel and divided into sections on the first busbar W1 through the switch K, and the negative feeder cable NC and the negative feeder F are connected in parallel and divided into sections on the second busbar W2 through the switch K respectively. The TC end of the traction cable can be connected in series to directly supply the traction network. The ends of the traction cable TC and the negative feeder cable NC can be connected in series with the AT traction network. The power supply capacity and voltage level are mainly determined by the cable. The present invention has strong power supply capacity, long power supply distance and less phase separation, and is suitable for both existing line renovation and new line construction. Mainly used for electrified railway traction power supply.

The invention discloses a moving type segmented power supply induction electric energy transmission assembly. Multiple ground power source base stations are arranged near a rail along a power supply line, and multiple ground coils are arranged along the rail. The output ends of multiple ground power source modules in the same ground power source base station are connected to different alternatingcurrent buses, and power is supplied to the multiple adjacent ground coils at the same time through the alternating current buses, a diverter switch and a compensation module. A high-frequency magnetic field is generated by the ground coils, and a receiving module receives electric energy generated by the ground coils through electromagnetic induction. The whole power supply line is divided into multiple power supply sections. The power supply sections at the two ends of the power supply line are single-end power supply sections, and single-end power supply sections and double-end power supplysections are arranged between the single-end power supply sections at the two ends at intervals. Power is supplied to the ground coils in the single-end power supply sections through the ground powersource base stations in the single-end power supply sections. The ground power source base stations are not arranged in the double-end power supply sections, and power is supplied to the ground coilin each two-end power supply section at the same time through the two ground power source modules in the adjacent two single-end power supply sections.

A coaxial cable power supply system for electrified railways, consisting of central traction substation, coaxial cable, traction transformer, catenary, rail, circuit breaker, etc.; central traction substation is connected with coaxial cable; coaxial cable and catenary Parallel erection; the traction transformer is single-phase connected and distributed along the coaxial cable and catenary at certain intervals, its primary winding is connected between the inner conductor and outer conductor of the coaxial cable, and the secondary winding is connected to the catenary and catenary Between the rails; through the adjacent traction transformer, the inner conductor of the coaxial cable is connected in parallel with the catenary, and the outer conductor of the coaxial cable is connected in parallel with the rail; the power supply capacity and voltage level of the system of the present invention are mainly determined by the coaxial cable, suitable for coaxial The matching of the axial cable with various voltage levels of the catenary is conducive to the light suspension of the catenary and the improvement of the overall quality; the coaxial cable is erected along the railway or subway tunnel, without occupying additional corridors, which can reduce the interface between the railway and the public grid and save external Power investment, easy to manage.

The invention provides a three-phase traction network distributed power supply system and a control method, and relates to the technical field of electrified railway traction power supply. The main busbar of the main substation is connected to the three-phase traction cable through the feeder, the primary side of the traction substation is connected to the three-phase traction cable, and the secondary side is connected to the three-phase traction network. The substation is connected to the traction substation in a distributed manner, and the central coordination controller set in the main substation controls the operation mode of the power generation device, and controls the power generation and reactive power distribution; the use of a distributed power supply system is conducive to supporting the system network voltage and extending the The power supply distance is also conducive to the distributed access and nearby consumption of new energy, promotes the green development of the railway system, and can avoid related power quality problems. It is mainly used for the management of the distributed power supply system connected to the three-phase traction network.