736 results about "Traction transformer" patented technology

The invention relates to a single-phase universal electric energy quality controller for power supply for electrified railways, and belongs to the technical field of flexible AC power transmission and distribution; the invention comprises a single-phase multi-coil transformer composed of a primary coil and n secondary coils, so that the secondary coils of the transformer can be connected in parallel with n voltage sources of current transformers; n capacitors are connected with n voltage source current transformers, so as to form a single-phase chain-type H-bridge current transformer with n chains; the AC terminal of the H-bridge current transformer is directly connected with the traction grid through a reactor. The invention has the functions of active power control, reactive power compensation and harmonic compensation, so as to resolve three-phase voltage unbalance, voltage fluctuation, low power factor and harmonic pollution and so on that exist in ER traction transformer stations, effectively lower the capacity of traction transformers, increase ER transport capacity and transportation capability. Moreover, the invention is characterized in small occupied area, little loss and low cost, in order to gain perfect harmonic suppression characteristics and dynamic response features, and provide convenience in industrial production and improve device reliability.

The invention relates to a contact system, power pack and energy storage device hybrid-powered CRH train traction system, which is characterized by mainly comprising a traction transformer, a power pack, an energy storage device, a traction converter and a traction motor, and a contact system is connected with the primary side of the traction transformer through a pantograph, and the two secondary windings of the traction transformer are directly connected with the traction converter; the traction converter is connected with the traction motor, and a diesel engine and a generator form the internal combustion power pack; and the three-phase output of the generator is directly connected with the traction inverter, and the energy storage device is connected with the intermediate DC bus of the traction converter. The traction system can run simultaneously on electrified and non-electrified lines, and can rescue self through power supplied by the power pack and the energy storage device.

The invention discloses an electrified railway traction power supply and energy storage device and a method of the electrified railway traction power supply and energy storage device. The energy storage device is connected between a feeding arm alpha or feeding arm beta at the output end of a traction transformer and a steel rail, or two energy storage devices are connected between the feeding arm alpha and the steel rail and between the feeding arm beta and the steel rail respectively, wherein the energy storage device is arranged in a traction substation. The energy storage device comprises a control unit, an isolation transformer, a PWM current transformer, an energy transformation circuit and an energy storage element, wherein the PWM current transformer, the energy transformation circuit and the energy storage element are connected in sequence, and the control unit is used for carrying out calculation according to the voltage, current and direction of the feeding arm alpha and/or feeding arm beta to complete control over the PWM current transformer and the energy transformation circuit and achieve energy exchange between the energy storage device and the feeding section connected with the energy storage device. The electrified railway traction power supply and energy storage device can fully recycle locomotive braking feedback electric energy, improve the energy utilization ratio of a traction power supply system, reduce the installation billing capacity of the traction transformer, reduce cost and absorb and store energy even in electricity valleys, has the effect of peak load shifting and further has the functions of dynamic reactive-power compensation and low-order harmonic suppression.

The invention discloses an electric energy regulation device and method for electrified railways. The electric energy regulation device is in bridging connection between two power supply arms of a traction transformer. The electric energy regulation device comprises isolation transformers, single-phase back-to-back PWM converters, an energy conversion circuit, an energy storage element and a control unit. The control unit carries out calculation according to voltages, currents and directions of the power supply arms alpha and beta and completes control over the PWM converters and the energy conversion circuit. Consequently, energy conversion between the power supply arms alpha and beta and the energy conversion between the energy storage element and the power supply arm alpha or the power supply arm beta can be achieved. The electric energy regulation device is capable of fully recycling and utilizing braking feedback electric energy of a locomotive through transfer, storage and release of the electric energy, improves the energy utilization rate of a tractive power supply system, reduces the installation billing capacity of a traction transformer, can deal with the negative sequence, idle work and harmonic waves of a traction substation, avoids traction force losses and speed losses, caused by electric phase separation, of a train and can also have the effects of peak load shaving and voltage stabilization and can be used as an emergency power supply.

The invention discloses an automatic passage method through phase splitting for an AC-DC-AC electric locomotive which comprises the following steps: before the electric locomotive runs into a neutral section, a traction control system controls a traction motor to work in a regenerative braking mode and controls an inverter to stabilize intermediate DC voltage; a pulse rectifier works in an inversion state; an alternating voltage equal to a traction voltage is generated on the primary side of a traction transformer, thereby making the primary side of the traction transformer obtain zero current from a power supply arm; after the electric locomotive runs into the neutral section, the intermediate DC voltage still maintains stability; the AC phase generated by the inversion of the pulse rectifier in the inversion mode changes gradually so as to make the voltage of the primary side of the traction transformer change to become equal to the traction voltage of a next power supply arm; and then the electric locomotive enters the next power supply arm and runs normally. The method enables the automatic passage through phase splitting; in addition during the phase splitting, a main circuit breaker does not need to be turned on and off without arc discharge, interception overvoltage and closing surge overcurrent, and an auxiliary system is not deenergized; and the passage through phase splitting has short time, low traction loss and small speed drop.

The invention discloses a single-phase combined in-phase power supply and transformation structure mainly comprising a traction transformer and a CPD. In the CPD, a high-voltage matching transformer primary side and a traction transformer primary side form an SCOTT connected group, a secondary side winding of the CPD is connected to the incoming end of an AC-DC-AC converter, and the outgoing end of the AC-DC-AC converter is connected with the primary side of a traction matching transformer. A secondary side winding of the traction transformer and the secondary side winding of the traction matching transformer are equal in voltage amplitude and phase and both connected with a traction busbar; traction load calculated capacity is equal to the sum of traction transformer calculated capacity and CPD calculated capacity, the traction transformer is responsible for main power supply, and the CPD calculated capacity is determined by the capacity of traction load which caused exceeding three-phase voltage unbalance. The single-phase combined in-phase power supply and transformation structure has the advantages that optima configuration of traction power supply resources is realized and energy conservation is better.

The invention discloses a single-phase and three-phase combined in-phase power supply and transformation device which comprises a single-phase traction transformer, a three-phase YNd11 grounding compensation transformer and a single-phase in-phase compensation device thereof; the in-phase compensation device comprises an alternating current-direct current-alternating current (AC-DC-AC) converter; the traction transformer and the compensation transformer have equal effect to a three-phase and two-phase balance transformer with the phase of secondary side voltage being vertical; when in a normal state, the traction transformer, the compensation transformer and the in-phase compensation device jointly supply power for a transaction load by a specified proportion; when the compensation transformer or the in-phase compensation device exit the operation, the traction transformer can work independently in a short time; and a backup traction transformer can replace the traction transformer to work and can work on linear voltage different from that of the traction transformer. According to the device, the electric phase at the exit of a traction transformer substation can be canceled, so that the electric energy quality requirements mainly comprising the unbalance of three-phase voltage can be met, and the optimal configuration of traction power supply resources can be realized.

The invention relates to a high-voltage SiC solid-state transformer based high-speed rail locomotive AC-DC-AC traction system, in particular to a solid-state transformer based locomotive AC-DC-AC traction system and method. Solid-state transformer modules made of SiC materials are adopted, and input sides of the transformer modules are in series connection while output sides are in parallel connection to form the high-speed rail locomotive AC-DC-AC traction system. Compared with traction transformers made of conventional semiconductor materials, solid-state transformers made of the SiC materials have the advantages that due to good power handling capability and frequency capability of the transformers, size and weight of the transformers can be reduced, load weight of a locomotive is reduced greatly, and good economical efficiency is realized; the input sides are in series connection while the output sides are in parallel connection, so that the high-speed rail locomotive traction system is easy to expand, the locomotive can be kept in normal operation within a period of time if the secondary edge of one solid-state transformer module has loss, and accordingly reliability is improved.

The present disclosure is concerned with a power supply system for railway traction applications including a multilevel AC/DC converter. The converter comprises a plurality of series-connected single-stage cycloconverters or direct AC frequency converters connected between an AC supply line and a traction transformer. The transformer is operable at a transformer nominal frequency below 3 kHz and above the AC line frequency. On the secondary side of the transformer, more than one parallel-connected secondary converter are provided and connected to a DC link. In case of failure of one of the secondary converters, the multilevel AC/DC converter may continue to operate with reduced power delivered by the remaining operating levels.

The invention discloses a traction transformer winding temperature rise and oil flow speed relevance testing method. The traction transformer winding temperature rise and oil flow speed relevance testing method comprises the following steps of (1) testing temperature rise of a winding of a transformer under different loads and oil flow speed at the position of an outlet of a heat sink under the condition that environment temperature and heat dissipation conditions are not changed, and calculating a fitting function of the temperature rise of the winding in regard to the oil flow speed at the position of the outlet of the heat sink; (2) changing the environment temperature under the condition that the loads and the heat dissipation conditions are not changed and calculating an influence coefficient of the environment temperature on the temperature rise of the winding in regard to the oil flow speed at the position of the outlet of the heat sink; (3) changing the heat dissipation conditions of the heat sink under the conditions that the load and the environment temperature are not changed and calculating an influence coefficient of the heat dissipation conditions on the temperature rise of the winding in regard to the oil flow speed at the position of the outlet of the heat sink; (4) determining a modified function of temperature rise of the winding in regard to the oil flow speed at the position of the outlet of the heat sink under various influence factors; and (5) determining temperature rise of the winding on the basis of a determined fitting function of the oil flow speed and the temperature rise of the winding in regard to the oil flow speed at the position of the outlet of the heat sink. By the traction transformer winding temperature and oil flow speed relevance testing method, a reliable testing platform can be provided for research of temperature rise of the winding of the energy-saving type traction transformer, and the temperature rise of the winding can be measured in real time on the basis of a determined relevance curve.

The invention discloses an AC electrified railway traction in-phase power supply device based on a YNd11 connection transformer, the traction transformer of the device is a three-phase transformer (T1) connected in YNd11, and the three primary sides of the transformer (T1) in a YN connection The three phases A, B, and C are connected to the high-voltage public power grid, and the low-voltage side terminals (a, b, c) of the transformer are connected to a power flow controller (IC), and the terminals a and b are connected to the electrified railway catenary (TR) . The device can realize the same-phase power supply for the entire railway line without phase separation, and the power supply voltage is stable, ensuring the high-speed and heavy-load operation of the locomotive; at the same time, the device can eliminate the negative sequence, reactive power and harmonics of the railway traction load on the electric energy of the public grid impact, low cost, and easy implementation.

The invention discloses an experimental device and experimental method for simulating heat production of a traction transformer. The experimental device is used for study experiments of the related properties of the temperature field and oil flow field of the traction transformer. The experimental device is composed of a transformer body, a heat production control system and an oil path cooling control system. According to the experimental device, the no-load loss and load loss of the transformer can be changed conveniently and fast under the conditions of needing no high voltage or high current, stable or time-varying loads in the transformer are simulated so that the stable or time-varying temperature field or oil flow field can be generated, subsequent measuring is facilitated, and meanwhile the influence of a strong magnetic field and a strong electrical field on a measuring instrument is reduced.

The invention discloses a novel power electronic traction transformer topological structure and a control method thereof. A novel power electronic traction transformer comprises N power transformation units. Each power transformation unit comprises an H bridge converter and a middle/high frequency isolated-type DC/DC conversion unit. The N H bridge converters for an N-grade cascaded H bridge converter, and the middle/high frequency isolated-type DC/DC conversion unit comprises K DC/DC converters. Input ends of the N power transformation units are connected in series and output ends of the N power transformation units are connected in parallel. Input ends of the N-grade cascaded H bridge converter are connected in series, and output ends of the N-grade cascaded H bridge converter are disconnected. Input ends of the N DC/DC conversion units are connected with the output ends of the N-grade cascaded H bridge converter, and output ends of the N DC/DC conversion units are connected in parallel. Input ends of the K DC/DC converters are connected in series, and output ends of the K DC/DC converters are connected in series. The power balance control of the novel power electronic traction transformer comprises three parts: the direct current output voltage balance control of each H bridge converter, the output current balance control of each middle/high frequency isolated-type DC/DC conversion unit, and the input voltage balance control of each DC/DC converter of each middle/high frequency isolated-type DC/DC conversion unit.

The invention provides a same-phase traction power supply system suitable for a high-speed electrified railway, and belongs to the technical field of traction power supply and electric power transmission and distribution. The same-phase traction power supply system includes traction transformers and a same-phase compensator which are mutually independent, and the traction transformers and a compensation transformer and a matching transformer in the same-phase compensator are of single-phase structures. The primary windings of the traction transformers and the primary winding of the compensator transformer form V, and a connection method of V is as follows: one end of the primary winding of the matching transformer is connected with one end of the secondary winding of the compensation transformer, and other end of the primary winding is connected to the positive electrode of a traction busbar; the other end of the secondary winding of the compensation transformer is connected to the ground or the negative electrode of the traction busbar, alternating current ports of one side of ''back-to-back'' converters are connected to the secondary winding of the compensation transformer, and the other side is connected to the secondary winding of the matching transformer; and the same-phase compensator adopting hybrid compensation configuration also includes a fixed capacitor branch circuit and a fixed reactor branch circuit. The same-phase traction power supply system suitable for the high-speed electrified railway can achieve an effect that the capacity of both active and passive compensation devices is the lowest configuration, and a relatively high capacity utilization rate of the transformers is maintained at the same time.

The invention discloses a traction transformer layered oilpaper insulation dielectric response experiment system comprising a transformer oil tank, a layered insulation system disposed in an experiment box body, a connecting device (an oil pump, a plastic hose and multi-pipe joints) of the transformer oil tank and the experiment box body, a dielectric response tester, and a control and data acquisition system. The experiment system of the invention can be used for simulating non-uniform heat aging in an actual traction transformer oilpaper insulation system and researching the dielectric response characteristic of the oilpaper insulation of non-uniform heat aging, and can help to research remaining life evaluation of the oilpaper insulation with non-uniform heat aging distribution.

The invention relates to a transformer body structure for a single-phase traction transformer used for the AT power supply means, belonging to the transformer manufacturing technical field. The invention mainly comprises iron stems (15), a high voltage coil (1) and a low voltage coil (2) which are connected in series and are respectively arranged on two iron stems (15), etc, wherein, the low voltage coil has a radial splitting structure and consists of two or four coils; fiber container oil clearance insulating structures (13) are arranged between the two or four coils; the head end (3) of the high voltage coil has an interleaved winding structure; other sections of the high voltage coil have continuous winding structures; electrostatic rings (7) are arranged between the head end (3) and the tail end (4) of the high voltage coil and end rings; two angle rings (9) are symmetrically arranged between layers of the head end (3) and the tail end (4) of the high voltage coil and an yoke insulating layer (8). The overall structure design is reasonable; the transformer body structure has reliable insulating strength and overloading and short circuit resistant capabilities and can meet the requirements of the prior electrified railways.

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 discloses a system for compensating the combined negative sequence current of a power regulator and a static var compensator. The system consists of a railway power regulator and the static var compensator. The railway power regulator is installed between two power supplying arms at a secondary side of a traction transformer by two single-phase three-winding reducing transformer. Thestatic var compensator consists of two groups of thyristor switched capacitors which are connected in parallel and a group of thyristor controlled reactors. The thyristor switched capacitors and thethyristor controlled reactors are respectively connected with two traction power supplying arms by single-phase three-winding reducing transformers, wherein the thyristor switched capacitors are installed below the single-phase three-winding reducing transformer which is connected with the power supplying arms with relatively advanced voltage phases, and the thyristor controlled reactors are installed below the single-phase three-winding reducing transformer of the power supplying arms with relatively hysteretic voltage phases. The system can maximally reduce the capacity of the railway powerregulator while also satisfying the requirement of a railway system on the unbalancedness degree of three phase current.

The invention discloses an electrified railroad homo-phase traction power supply system. A traction transformer (SS1) of a traction substation is a three-phase-two-phase transformer; three phases (A, B and C) of the primary side of the traction transformer (SS1) are connected with a public power grid; a voltage reduction transformer (G), a first single-phase current transformer (M1), a direct-current capacitor (C) and a second single-phase current transformer (M2) are connected between an alpha output phase and a beta output phase of the secondary side in turn; the alpha phase supplies power to a locomotive (L), and the output voltage of the alpha phase is 27.5kV; and the output voltage of the beta phase is between 600 and 2,000V. The system can implement two-arm homo-phase power supply of the railroad traction substation without split phase, reduces the split phase link, is favorable for high-speed, stable and safe operation of the railroad, and has the advantages of simple structure, low cost and convenient implementation.

The invention discloses a high-integration converter device, which comprises two rectification modules positioned in a box body, two inversion modules, an auxiliary variable module, a battery charger module, an auxiliary depressurizing and filtering device and a traction control unit, wherein the rectification modules output direct-current voltage to a middle direct-current loop after being applied with voltage from a traction transformer; the middle direct-current loop is connected with two paths of main inversion loads and one path of auxiliary inversion load in parallel; the main inversion loads convert the direct current into the three-phase alternating current by the inversion modules; the three-phase alternating current is supplied to a motor; and the auxiliary variable module load is characterized in that power is supplied to auxiliary equipment out of the converter device and the battery charger module in the converter device via the auxiliary depressurizing and filtering device. The high-integration converter device disclosed by the invention has the advantages of simple and compact structure, low cost, high integration degree, convenience in installation and good reliability.

The invention discloses a battery-powered traction system for electric drive traction rail vehicles. The system is powered by a bow network system, the system comprising: a traction transformer, a traction converter, a traction motor, a two-way AC/DC converter, and a battery device. The two-way AC/DC converter is connected to the auxiliary converter and the battery unit. According to the power supply state of the bow network system, AC/DC conversion is realized for battery device charging and vehicle auxiliary load power supply or DC/AC inverter to realize battery device traction function andpower supply for vehicle auxiliary load. The invention can not only supply power for the vehicle auxiliary AC/DC load device, but also provide power for the traction inverter. In turn, the traction motor is started to realize the emergency traction of the vehicle, ensuring that the vehicle can smoothly run to the nearest station, the maintenance base, the temporary repair warehouse, etc., withoutthe need of other tractors for traction.

The invention discloses an alternating current electrified railway in-phase continous power supply system based on multi-port direct current transmission. The system comprises more than one three-phase high-voltage alternating current power supply, direct current converters used for converting three-phase high-voltage alternating current into high-voltage direct current, a high-voltage direct current transmission loop used for transmitting the high-voltage direct current to a loop of each traction transformer, alternating current converters used for converting the high-voltage direct current into low-voltage single-phase alternating current, and a contact network system connected with an output end of the alternating current converter, wherein the contact network system is divided into an alternating current bus and a return line which takes power by a locomotive and then flows back from a steel rail. The system has the advantages that the system is simple in structure principle, high in safety and reliability, and easy to realize and popularize.