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

The invention relates to a hybrid parallel type high-voltage direct current traction power supply current transformer and a control method thereof. The hybrid parallel type high-voltage direct current traction power supply current transformer is characterized by comprising a set of pulse width modulation (PWM) rectifier units and a set of diode rectifier units, wherein both an input end of the PWM rectifier units and an input end of the diode rectifier units are connected with an alternating current electric network, and an output end of the PWM rectifier units and an output end of the diode rectifier units are connected in parallel to realize high-voltage direct current output. Because the PWM rectifier units and the diode rectifier units are connected in series, the direct current output voltage of the entire current transformer is improved, the power supply distance is prolonged, and the contact net loss is reduced. Meanwhile, equipment investment is reduced, and the reliability of a system is improved. The hybrid parallel type high-voltage direct current traction power supply current transformer and the control method thereof can be widely applied to urban railway transit traction power supply systems.

The invention relates to an electrified railway in-phase power supply device and a multi-target coordinated instantaneous current control method adopted by the device. After the in-phase power supply device is used, the electrified railway whole-line in-phase power supply can be realized, the output power of two power supply arms of a traction transformer can be balanced, and the negative sequence problem can be thoroughly solved; the load reactive power and the harmonic current can be compensated, and the electric energy quality of a traction power supply system can be comprehensively improved; the voltage of a traction electric network can be stabilized, the transient state stability of the voltage can be improved, the power supply distance of the power supply arms can be increased, and the amount of power substations can be reduced; the electrified railway in-phase power supply device and the multi-target coordinated instantaneous current control method are multiple in targets, the multi-target can be simultaneously controlled, the control harmony at two sides can be guaranteed, the dynamic response capability is stronger; a rectification side inverter takes the active power transfer and the stable direct voltage as a control target, and participates the reactive power control; and an inversion side inverter performs active power, reactive power and harmonic wave control, and participates the stable control of the direct voltage.

The invention relates to a negative voltage backflow DC supply system for track traffic. A negative voltage return line and a DC converter implementing negative voltage backflow are added in a conventional DC supply system, the negative voltage return line replaces a walk rail return line in the conventional DC supply system, stray currents of the conventional DC supply system and negative effects caused by overhigh potential of the walk rail relative to the earth can be greatly reduced or eliminated, loss of a supply line can be greatly reduced, and the supply distance of a DC traction substation can be raised. At the same time, the DC converter can be used as an energy storage apparatus for storing regenerative braking energy of a train, the utilization efficiency of the regenerative braking energy in the DC supply system can be raised, and the voltage of the DC supply system for track traffic can be kept stable.

The invention provides a three-phase traction network distributed power generation and power supply system and a control method, and relates to the technical field of electrified railway traction power supply. A main bus of a main substation is connected with a three-phase traction cable through a feeder line, the primary side of a traction substation is connected with the three-phase traction cable, and the secondary side of the traction substation is connected with a three-phase traction network; power generation devices arranged along a corridor of a railway are connected into the traction substation in a distributed manner through the traction substation along the railway, and a central coordination controller arranged in the main substation controls the operation mode of the power generation device and performs power generation and reactive power distribution control. The distributed power generation and supply system is beneficial to supporting the system network voltage and prolonging the power supply distance, is also beneficial to the distributed access and nearby consumption of new energy, promotes the green development of a railway system, can avoid the related electric energy quality problems, and is mainly used for the management of access of the distributed power generation and supply system to the three-phase traction network.

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.

The invention relates to a distribution network system of a mobile power station. The distribution network system is installed in a network cabin of a housing of the power station and includes a first-level distribution network system and a second-level distribution network system. The first-level distribution network system comprises a first-level cable reel, a main cable and a distribution box. The second-level distribution network system includes two second-level cable reels, two sub-cables and a plurality of multi-purpose power strips. The distribution box and the power station are connected together through the main cable and the sub-cables to form a plug-in type radial distribution network. The distribution network system of the mobile power station is suitable for medium and small power generator sets and has the designing features of compact structure and convenient operation. The distribution network system is disposed in the network cabin of the housing, completely separating the network cabin from a set cabin. The distribution network system of the mobile power station is applicable to occasions requiring power supply for multiple purposes. The power supply radius can be adjusted as required and power supply distance is long.

The invention discloses a device for providing electric energy for a plurality of passive electronic tags in a large-range space, which comprises a transmitting end and a receiving end, and is characterized by further comprising four middle ends, the transmitting end and the receiving end are coupled and connected through electromagnetic induction, and the four middle ends are distributed by taking the transmitting end as the center. And the four middle ends are coupled with the transmitting end in an electromagnetic induction manner. A traditional high-frequency radio frequency identification system is limited in power supply direction, short in power supply distance and low in degree of freedom, and the device adopts a magnetic coupling resonance wireless power transmission technology, a segmented compensation technology, an auxiliary coil resonance network and a dynamic tuning technology, so that the device generates a relatively uniform high-frequency alternating-current electromagnetic field in a large-range space; a plurality of passive electronic tags can obtain electric energy at any position in the space, and a power supply area can be expanded to dozens of cubic meters.

The invention comprises an accumulator with output end connected to the base station of little smart wireless city phone, a conversion circuit connected to local side and the control circuit by a multiplexer and a photocoupler respectively, which comprises a transformer, a switch source controller, a tri-end voltage stabilizing block, a MOSFET, a triode, a diode, and resistance and capacitor element; and a control circuit connected to the accumulator, which comprises an operational amplifier, a triode, a diode, and resistance and capacitor element. Wherein, it parallels a relay between the control circuit and the lead-acid accumulator (1.2-2A/h, 12V*17).

A bus sensor comprises a main power supply (1), a core power supply (3), an auxiliary power supply (4), a communication power supply (5), a core processing circuit (6), a display circuit (7), a sensing module circuit (8) and a communication circuit (9), wherein the main power supply (1) supplies power to the core power supply (3), the auxiliary power supply (4) and the communication power supply (5), the core power supply (3) maintains continuous power supply, the core power supply (3) is connected with the core processing circuit (6), and the core processing circuit (6) enters a dormant statewhen not working. According to the invention, independent power supply control is added to other parts of the sensors except the core circuit, so that the sensors are powered off, and the transient current when the plurality of sensors are powered on and started is reduced by starting the sensors in a time-sharing manner, so that the number of the sensors connected with the bus can be increased.

A remote power supply control device disclosed by the invention comprises an electricity meter connected with an electric device, an input module, a boost control module, a through switch, a central control module, an interface module and a power supply module, the boost control module comprises a voltage comparison unit and a boost unit, and the interface module is used for connecting the electric device. The power supply module comprises a power distribution circuit, a first power limiting circuit and a second power limiting circuit. The electricity meter comprises a first function module and a second function module. By adopting the technical scheme of the invention, the power can be effectively distributed and managed, and meanwhile, the reliability of an intelligent instrument is improved.

The invention provides an electrical train based on ground traction power supply. The electrical train comprises a traction motor and a reactive power compensator connected with the traction motor, and the traction motor is driven and controlled through a ground traction converter; and the reactive power compensator emits reactive current according to the operation state of the traction motor and provides excitation and reactive power compensation for the traction motor. The traction motor in the electric train is driven and controlled by the ground traction converter, so that a vehicle-mounted traction converter and a vehicle-mounted traction transformer are omitted, and the reactive power compensator for providing excitation and reactive power compensation for the traction motor is arranged in the electric train, so that the axle load of the electrical train can be effectively reduced, the effective space of the electrical train is improved, the running speed and efficiency of the electrical train are improved, and the power factor of the electrical train and the power transmission distance of a three-phase traction network can be improved.

The invention relates to a heavy haul railway AT power supply capacity calculation method; when the method is used, an AT power supply heavy haul railway traction cable cut-through power supply scheme is calculated, mathematical models of CTN equivalent impedance, current distribution, voltage loss, CTN tail end network voltage and other electrical parameters are deduced, then the calculation method of the power supply distance is obtained, and the power supply capacity of the scheme is judged. The current heavy haul railway AT power supply scheme is convenient to reform, so that the current heavy haul railway AT power supply system has greatly reduced electric split phases, improved power supply capability and prolonged power supply distance, the operation of a locomotive is safer and more reliable, and the operation speed is improved.