974 results about "Traction power supply" patented technology

The invention discloses an energy feeding type dragging power supply device and a control method thereof. The energy feeding type dragging power supply device comprises a multiple transformer and at least two four-quadrant converter modules. The energy feeding type dragging power supply device and a diode rectification dragging unit are arranged in parallel form. A primary side of the multiple transformer of the energy feeding type dragging power supply device is connected to an alternated current medium-voltage power grid through a high-voltage switch cabinet; each set of windings at a low-voltage side of the multiple transformer is connected to an alternated current side of one four-quadrant converter module; and the direct current sides of the four-quadrant converter modules are in parallel connection after being connected to a direct current side isolation switch and are connected to a direct current bus through a direct current switch cabinet and a cathode cabinet. The energy feeding type dragging power supply device can work at three different modes of dragging, feedback or SVG (Scalable Vector Graphics) according to the requirements. The energy feeding type dragging power supply device is compatible with an existing dragging power supply system under the condition of meeting a power grid compatibility demand. The energy feeding type dragging power supply device has the advantages of moderate cost, capability of solving the technical problems of feeding back a regenerated braking energy and stabilizing a dragging network voltage, and real-time static reactive power compensation capacity.

The invention discloses an emergency traction power supply system of an electric motor unit, which comprises a traction transformer used for reducing high voltage of a contact network, two rectifiers used for rectifying alternating current of secondary side windings of the traction transformer into voltage of middle direct current links, two inverters used for taking electricity from the middle direct current links and performing inversion into three-phase alternating current, a two-way auxiliary current transformer used for taking electricity from the middle direct current links and performing inversion into three-phase alternating current or taking electricity from a two-way charger and then performing boosting and rectification into the voltage of the middle direct current links, an auxiliary load used for obtaining the three-phase alternating current from the two-way auxiliary current transformer or the two-way charger by an auxiliary load power supply busbar, and the two-way charger used for obtaining the three-phase alternating current from a three-phase alternating current output side of the two-way auxiliary current transformer and performing voltage reduction and rectification on the three-phase alternating current into direct current to supply power to a lithium titanate battery and a direct current load which are connected with the two-way charger, or used for taking electricity from the lithium titanate battery and performing boosting and inversion into the three-phase alternating current to supply power to the auxiliary current transformer.

The invention discloses a power quality integrated management device of an electrified railway traction supply network. The power quality integrated management device comprises an APF branch circuit and an HPF branch circuit. The APF branch circuit comprises a connecting electric reactor, a controller, more than one set of APF converter and more than one set of charging circuit corresponding to the APF converter. After being connected with the charging circuits, the APF converters are connected to a contact network through the connecting electric reactor in a hanging mode. The APF converters are cascaded through more than two power units, the controller is connected with the APF converters and sends a control signal to switch components of the power units, single-phase uniform amplitude alternating-current PWM output voltage is generated, and an expected current injection contact network is obtained through the connecting electric reactor. According to the HPF branch circuit, a second-order resonance circuit is composed of a resistor, an electric reactor and a capacitor. The power quality integrated management device can provide idle work support for an electric railway traction power supply system, the power factor is improved and meanwhile negative sequence components, harmonic waves, voltage fluctuations and voltage flickers in the system are effectively restrained.

The invention relates to an alternating current and direct current mixed traction power supply system with an ice melting function. The alternating current and direct current mixed traction power supply system comprises an alternating current power supply assembly, a direct current power supply assembly and a discharging coil, wherein the alternating current power supply assembly is used for realizing alternating current power supply, a traction transformer of the alternating current power supply assembly is connected into a traction power supply net through a first circuit breaker, the traction transformer outputs alternating current after the voltage reduction and is connected with the traction net through an alternating current feeder switch, the direct current power supply assembly is used for realizing direct current power supply, a rectifying transformer of the direct current power supply assembly is connected into a traction power supply net through a second circuit breaker, the rectifying transformer is subjected to voltage reduction and outputs direct current after being rectified via a rectifier, one path is connected with the traction net through the direct current feeder switch, the other path is connected with the traction net through a double-electrode high-voltage isolation switch, in addition, a high-voltage isolation switch used for realizing short circuit on a traction net uplink and a traction net downlink is arranged at the tail end of a section post line, and the traction net uplink and the traction net downlink form a ice melting loop; the discharging coil is arranged at the positive bus end of the output side of the direct current feeder switch and is provided with a high-voltage switch. The alternating current and direct current mixed traction power supply system has the advantages that the principles are simple, the function integrality is high, the operation is safe and reliable, and the like.

The invention discloses a co-phase power supply device and a traction power supply system. The co-phase power supply device comprises a first MMC (modular multilevel converter) valve and a second MMC valve. One end of the first MMC valve is coupled to a first power supply arm of a traction transformer, the other end of the first MMC valve is connected with a return wire, and the first MMC valve is used for converting AC (alternating current) voltage of the first power supply arm of the traction transformer into DC (direct current) voltage; one end of the second MMC valve is coupled to a second power supply arm of the traction transformer, the other end of the second MMC valve is connected with the return wire, and the second MMC valve is used for inverting DC voltage transmitted by the first MMC valve into AC voltage which is identical to the second power supply arm of the traction transformer in amplitude and phase. By means of inter-transmission of active energy of the two power supply arms on sides of the traction transformer, negative-phase sequence current can be eliminated, the capacity utilization rate of the traction transformer can be maximized and electric split-phase of a traction network can be eliminated; the MMC valves compensate idle power and harmonic waves of the two power supply arms, and the increase of risk of overhigh harmonic waves of devices such as capacitors, SVCs (static var compensator) and SVGs (static var generator) can be avoided, so that the co-phase power supply device can be applied to comprehensive treatment of power quality of traction transformers.

The invention relates to a grid management system and a grid management method of high-speed railway train operation fixed equipment. Primarily, a grid management system of train operation fixed equipment is constructed on the basis of the conventional professional management information systems such as public service, electric service and traction power supply of the high-speed railway train operation fixed equipment; the high-speed railway line is divided into a plurality of grid units according to a certain standard; the equipment state is more completely and more timely sensed by using a modern information technology and a coordination mechanism, more complete equipment state information interconnection and intercommunication are realized, and the equipment repair decision is more intelligently made to finally achieve the purposes of guaranteeing the operation safety, scientifically controlling the operation risk, integrating the maintenance resources, reducing the repair cost and improving the management efficiency.

The invention discloses an electrified railway energy storage type traction power supply system and a control method thereof. The system comprises a power flow controller, an energy storage system anda single-phase main traction transformer. The power flow controller comprises a high-voltage matching transformer, a grid side AC / DC converter, a traction side AC / DC converter, an intermediate DC side capacitor and a traction matching transformer. The energy storage system comprises a bidirectional DC / DC converter and an energy storage element, and the energy storage element is connected in parallel to the intermediate DC side capacitor through the bidirectional DC / DC converter. The control method comprises the following steps: collecting voltage and current data of a load at the outlet of asubstation, judging the operation condition of the system, and calculating the compensation power of the ports of the power flow controller and the energy storage device under each condition; adding the compensation power into double-loop control of a power outer loop and a current inner loop to obtain a modulation signal; and generating a switching signal of a control device through PWM modulation. Recovery and reutilization of the regenerative braking energy of trains are achieved, the utilization rate of the regenerative braking energy is increased, and negative-sequence electric energy quality treatment and compensation device capacity optimization are achieved.

The present invention relates to a computer analog control system with interlocking and traction power supply, and has a station simulated sand table, a signal computer interlocking system and a traction power supply system. A track circuit, a signal controller and a switch machine are controlled by an interlocking control operating machine and a lower computer; the power supply of a traction substation, a switching station and a contact line equipment are controlled by a traction power supply control operating machine and the lower computer, and the information of power supply is displayed on a power supply display screen. The use of a relay circuit is completely canceled by the computer analog control system with interlocking and traction power supply, the logical operation of computer is entirely carried out, thus achieving the various requirements of railway signals such as the interlocking of station signal, the interval automatic block, the displaying of grade crossing signal and so on, the present invention has convenient operation, good safety and high reliability; the function of trunk line electrification power supply and the remote control are successfully simulated.

The invention relates to an AC inductance-free energy-saving high-voltage DC traction power supply conversion device and a control method, which includes a multi-winding transformer and several conversion units. The multi-winding transformer consists of a primary winding and multiple secondary windings. Composed of windings, the number of circuits of the conversion unit is set corresponding to the number of secondary windings of the multi-winding transformer; the primary winding of the multi-winding transformer is connected to the AC power grid, and each secondary of the multi-winding transformer The side winding is connected to the input end of one converter unit, and the output terminals of each converter unit are serially connected in series to realize high-voltage direct current output. The invention saves electric energy, can ensure the stability of the DC power supply voltage, prolongs the power supply distance, and reduces the catenary loss. The invention can be widely used in urban rail transit traction power supply systems.

The invention discloses an electric railway section post automatic passing over of neutral section system and a control method thereof, and relates to the field of electric railway traction power supply. Pantograph recognizers are arranged on sectionalizers close to power supply arms. Load switches, thyristor switches and current transformers are sequentially connected in series and then connected to the two ends of the sectionalizers in parallel together with resistors and standby switches. The output ends of the pantograph recognizers, the current transformers and a voltage transformer, the trigger ends of the thyristor switches and the operation ends of the load switches and the standby switches are connected with a control unit. After the first thyristor switch is turned off due to current zero, the second thyristor switch is turned on to achieve current zero crossing point instantaneous switching from the first power supply arm to the second power supply arm, so that the power supply of a train is instantaneously switched from the first power supply arm to the second power supply arm, and uninterruptible power supply is achieved. The high-voltage high-resistance first resistor and second resistor work independently or together, and both can restrain balance current and the potential transient process. The system is mainly used for train continuous electricity passing over of neutral section.