CN112810450A - Train power supply system and method - Google Patents

Abstract

The application discloses a train power supply system and a train power supply method, wherein high-voltage alternating current acquired from a pantograph is converted into low-voltage alternating current through a traction transformer under the condition of an electrified railway, power is supplied to train electric equipment through rectification of a rectification unit, voltage stabilization of a direct-current support capacitor, inversion of an inversion unit and isolation filtering of an isolation filtering unit, and meanwhile, alternating current provided by the isolation filtering unit can be rectified through a bidirectional rectification inversion unit and then is charged to a storage battery pack; the alternating current is provided for the train electric equipment after the discharge of the storage battery pack and the inversion of the bidirectional rectifying and inverting unit under the condition of no electricity of the electrified railway. The problem that the train is high in cost due to the fact that the air-conditioning generator car is additionally arranged is solved, electric energy is provided by means of diesel oil combustion, environment pollution is serious, and potential safety hazards are caused due to diesel oil leakage.

Description

Train power supply system and method

Technical Field

The application relates to the technical field of rail transit, in particular to a train power supply system and method.

Background

At present, a power supply mode of a railway cold-chain logistics vehicle is to provide 380V alternating current for a train by additionally hanging an air-conditioning generator car.

Because an additional air-conditioning power generation car is needed, the air-conditioning power generation car occupies a train marshalling position, and the train cost is high. And because the energy of the air-conditioning power generation vehicle is diesel oil, the diesel oil tank is hung at the bottom of the air-conditioning power generation vehicle to provide power generation energy for the air-conditioning power generation vehicle, the train cost is further increased, the diesel oil is combusted to cause environmental pollution, and the problem of potential safety hazard can also exist due to diesel oil leakage.

Disclosure of Invention

In view of this, the present application provides a train power supply system and method, so as to solve the problems of high train cost, potential safety hazard and serious environmental pollution caused by supplying power to a train through an air-conditioning generator car in the prior art.

The application provides a train power supply system includes:

the train power utilization system comprises a traction transformer, a rectifying unit, a direct current supporting capacitor, an inverting unit, an isolation filtering unit and train power utilization equipment which are sequentially connected; the isolation filtering unit comprises an isolation transformer and a filtering unit;

the traction transformer converts high-voltage alternating current acquired from the pantograph into low-voltage alternating current;

the rectification unit acquires low-voltage alternating current from a secondary winding of the traction transformer, rectifies the acquired low-voltage alternating current to obtain direct current, stabilizes the rectified direct current through the direct current support capacitor, and outputs the stabilized direct current to the inversion unit;

the inversion unit inverts the direct current into a three-phase alternating current and outputs the three-phase alternating current to the isolation filtering unit;

the isolation filtering unit is used for carrying out isolation filtering processing on the received three-phase alternating current and outputting the alternating current subjected to the isolation filtering processing to the train electric equipment;

further comprising:

a bidirectional rectification inversion unit and a storage battery pack;

the first end of the bidirectional rectification inversion unit is connected with the output end of the filter unit, the first end of the bidirectional rectification inversion unit is also connected with the train electric equipment, and the second end of the bidirectional rectification inversion unit is connected with the storage battery pack and used for rectifying the alternating current output by the filter unit and then charging the storage battery pack; inverting the direct current output by the storage battery pack and outputting the inverted direct current to the train electric equipment;

the storage battery pack stores energy after receiving the direct current output by the bidirectional rectification inversion unit and discharges under the condition that the filtering unit does not output alternating current.

Preferably, the filtering unit includes:

the secondary winding impedance and the filter capacitance of the isolation transformer.

Preferably, the method further comprises the following steps: a power supply connector;

then, the connecting the filter unit and the train electric equipment includes:

the output end of the filtering unit is connected with one end of a power supply connector, and the other end of the power supply connector is connected with a through bus of the train;

and the run-through bus is respectively connected with the train electric equipment on each carriage of the train to supply power to the train electric equipment on each carriage.

Preferably, the method further comprises the following steps: an AC contactor;

alternating current contactor's one end with link up the bus connection, alternating current contactor's the other end with train consumer on two-way rectification contravariant unit and every section carriage is connected respectively, with alternating current contactor is when the on-state, through link up the bus and provide the alternating current for the train consumer on every section carriage, and when alternating current contactor is in the off-state, through storage battery passes through for the train consumer on every section carriage supplies power behind the contravariant of two-way rectification contravariant unit.

Preferably, the train is a cold chain transport train, and then the electric equipment for the train is refrigeration equipment.

The application also provides a train power supply system, includes:

the system comprises a traction transformer, a traction converter, a direct current support capacitor, an inversion unit, an isolation filtering unit and train electric equipment which are connected in sequence; the isolation filtering unit comprises an isolation transformer and a filtering unit;

the traction transformer converts high-voltage alternating current acquired from the pantograph into low-voltage alternating current;

the traction converter comprises a single-phase three-level pulse rectifier and an intermediate direct current circuit, wherein the input end of the single-phase three-level pulse rectifier is connected with the traction transformer, the output end of the single-phase three-level pulse rectifier is connected with the intermediate direct current circuit, and low-voltage alternating current converted by the traction transformer is rectified and then outputs direct current through the intermediate direct current circuit; the rectified direct current is stabilized through the direct current supporting capacitor, and the stabilized direct current is output to the inversion unit;

the inversion unit inverts the direct current into a three-phase alternating current and outputs the three-phase alternating current to the isolation filtering unit;

the isolation filtering unit is used for carrying out isolation filtering processing on the received three-phase alternating current and outputting the alternating current subjected to the isolation filtering processing to the train electric equipment;

further comprising:

a bidirectional rectification inversion unit and a storage battery pack;

the first end of the bidirectional rectification inversion unit is connected with the output end of the filter unit, the first end of the bidirectional rectification inversion unit is also connected with the train electric equipment, and the second end of the bidirectional rectification inversion unit is connected with the storage battery pack and used for rectifying the alternating current output by the filter unit and then charging the storage battery pack; inverting the direct current output by the storage battery pack and outputting the inverted direct current to the train electric equipment;

the storage battery pack stores energy after receiving the direct current output by the bidirectional rectification inversion unit and discharges under the condition that the filtering unit does not output alternating current.

Preferably, the train is a cold chain transport train, and then the electric equipment for the train is refrigeration equipment.

The application provides a train power supply method, which is applied to the power supply system and comprises the following steps:

determining whether power can be drawn from the pantograph;

if the fact that the electric energy can be obtained from the pantograph is determined, converting high-voltage alternating current obtained from the pantograph into low-voltage alternating current through the traction transformer, rectifying the low-voltage alternating current through the rectifying unit, outputting direct current, stabilizing the rectified direct current through the direct current supporting capacitor, and outputting the stabilized direct current to the inverting unit; inverting the direct current into three-phase alternating current through the inverting unit, outputting the three-phase alternating current to the isolation filtering unit, performing isolation filtering processing on the received three-phase alternating current through the isolation filtering unit, and outputting the alternating current after the isolation filtering processing to the train electric equipment; the bidirectional rectification inversion unit rectifies the alternating current output by the filtering unit and charges the storage battery pack;

and if the fact that the electric energy cannot be obtained from the pantograph is determined, the storage battery pack is controlled to discharge, and the received direct current is inverted through the bidirectional rectifying and inverting unit and then output to the train electric equipment.

Preferably, if it is determined that the electric energy cannot be obtained from the pantograph, the control unit controls the storage battery to discharge, inverts the received direct current through the bidirectional rectification and inversion unit, and outputs the inverted direct current to the train electric equipment, and the control unit includes:

if the fact that the electric energy cannot be obtained from the pantograph is determined, controlling the alternating current contactor to be disconnected;

and controlling the storage battery pack to discharge, inverting the received direct current through the bidirectional rectification inversion unit and outputting the inverted direct current to the train electric equipment.

The application also provides a train power supply method, which is applied to the power supply system and comprises the following steps:

determining whether power can be drawn from the pantograph;

if the fact that the electric energy can be obtained from the pantograph is determined, converting high-voltage alternating current obtained from the pantograph into low-voltage alternating current through the traction transformer, rectifying the low-voltage alternating current through a single-phase three-level pulse rectifier in the traction converter, and then outputting direct current through the intermediate direct current circuit; the rectified direct current is stabilized through the direct current supporting capacitor, and the stabilized direct current is output to the inversion unit; inverting the direct current into three-phase alternating current through the inverting unit, outputting the three-phase alternating current to the isolation filtering unit, performing isolation filtering processing on the received three-phase alternating current through the isolation filtering unit, and outputting the alternating current after the isolation filtering processing to the train electric equipment; the bidirectional rectification inversion unit rectifies the alternating current output by the filtering unit and charges the storage battery pack;

and if the fact that the electric energy cannot be obtained from the pantograph is determined, the storage battery pack is controlled to discharge, and the received direct current is inverted through the bidirectional rectifying and inverting unit and then output to the train electric equipment.

According to the train power supply system and the train power supply method, high-voltage alternating current acquired from a pantograph is converted into low-voltage alternating current through a traction transformer under the condition of an electrified railway, power is supplied to electric equipment of a train through rectification of a rectification unit, voltage stabilization of a direct-current support capacitor, inversion of an inversion unit and isolation and filtering of an isolation and filtering unit, and meanwhile alternating current provided by the isolation and filtering unit can be rectified through a bidirectional rectification and inversion unit and then charged to a storage battery pack; the alternating current is provided for the train electric equipment after the discharge of the storage battery pack and the inversion of the bidirectional rectifying and inverting unit under the condition of no electricity of the electrified railway. The problem that the train is high in cost due to the fact that the air-conditioning generator car is additionally arranged is solved, electric energy is provided by means of diesel oil combustion, environment pollution is serious, and potential safety hazards are caused due to diesel oil leakage.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a train power supply system disclosed in the present application;

fig. 2 is a circuit configuration diagram of a rectifying unit disclosed in the present application;

fig. 3 is a circuit configuration diagram of an inverter unit disclosed in the present application;

fig. 4 is a flowchart of a train power supply method disclosed in the present application.

Detailed Description

The 380V alternating current is provided for the train through adding the air conditioner power generation car of hanging among the prior art, and then for the consumer power supply on the train to cold chain transport train is the example, all includes refrigeration plant in every section cold chain carriage, need last for refrigeration plant power supply in the transportation, guarantees refrigeration plant's operation and then avoids the rotten of transportation goods.

However, the air-conditioning power generation car is additionally arranged on the cold chain transport train, so that the train cost is high, the air-conditioning power generation car provides electric energy by means of diesel oil combustion, the environmental pollution is serious, and the problem of potential safety hazard caused by diesel oil leakage exists.

In view of the above, the present application provides a train power supply system, which includes two power supply loops, where a first power supply loop converts a high-voltage ac acquired from a pantograph into a low-voltage ac through a traction transformer, and obtains a dc after rectification by a rectification unit, and stabilizes the dc after rectification by a dc support capacitor, outputs the dc after stabilization to an inversion unit, and supplies power to electric equipment of a train after inversion by the inversion unit and isolation filtering by an isolation filtering unit, and the first power supply loop acquires electric energy from the pantograph, so that the first power supply loop must be used to supply power to the electric equipment of the train under the condition of an electrified railway; in order to ensure that the power supply for the train electric equipment can still be ensured under the condition of no power supply of the electrified railway or the fault condition of the first power supply loop, the train power supply system further comprises a second power supply loop, the second power supply loop supplies power for the train electric equipment through a storage battery pack, wherein under the condition that the first power supply loop supplies power for the train electric equipment, the storage battery pack is charged by utilizing the first power supply loop, and the storage battery pack is charged after alternating current is rectified into direct current because alternating current output by the first power supply loop is the alternating current, so that the storage battery pack is controlled to discharge and is inverted into the alternating current to supply power for the train electric equipment under the condition that the first power supply loop cannot be utilized for supplying power for the train electric equipment. Because under the electrified railway condition in this application, through obtaining the electric energy and carrying out rectification, contravariant and keep apart the post-filter for the train power supply from the pantograph, supply power for the train through storage battery under the electroless gasification railway condition, realized continuously supplying power for the train, and need not additionally add a section of air conditioner power generation car, and then solved and add the air conditioner power generation car and lead to the train with high costs, and the air conditioner power generation car provides the electric energy with the help of diesel oil burning, lead to environmental pollution serious and have the problem that diesel oil leaks and lead to the potential safety hazard.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1, a train power supply system provided in an embodiment of the present application includes:

the train power utilization equipment comprises a traction transformer 110, a rectifying unit 120, a direct current supporting capacitor C1, an inverter unit 130, an isolation filter unit 140 and train power utilization equipment 150 which are connected in sequence.

The sequential connection means that the secondary winding of the traction transformer 110 is connected to the input terminal of the rectification unit 120, the output terminal of the rectification unit 120 is connected to the input terminal of the inversion unit 130, the output terminal of the inversion unit 130 is connected to the input terminal of the isolation filter unit 140, and the output terminal of the isolation filter unit 140 is connected to the train electrical equipment 150, so that the train electrical equipment 150 is supplied with power by using the electric energy obtained from the pantograph.

The pantograph is a main device for obtaining electric energy from a contact network and is one of high-voltage devices of a main circuit of a train.

In practical application, the electric energy can be obtained from the pantograph through the traction transformer, and the electric energy can also be obtained from the pantograph through the traction converter connected behind the traction transformer after the electric energy is obtained through the traction transformer.

In this embodiment, a scheme of obtaining electric energy from a pantograph through a traction transformer is mainly described. The following embodiments will describe a scheme for obtaining electric energy from the pantograph by a traction converter connected behind the traction transformer.

The secondary winding of the traction transformer 110 is connected to the input of the rectifying unit 120; the traction transformer 110 converts the high voltage 25KV obtained from the pantograph into low voltage ac suitable for the subsequent operation of the traction converter and other electric devices.

Referring to fig. 2, the rectifying unit 120 is composed of switching elements and is capable of rectifying ac power into dc power.

The rectifying unit 120 in this embodiment takes the low-voltage alternating current from the secondary winding of the traction transformer 110 and rectifies the low-voltage alternating current into direct current.

Referring to fig. 3, the inverter unit 130 is composed of switching elements, and is capable of inverting an input dc power into an ac power and outputting the ac power.

In the present embodiment, in order to improve the stability of the voltage, as shown in fig. 1, a dc support capacitor C1 is provided between the rectifying unit 120 and the inverting unit 130. The dc support capacitor C1 stabilizes the rectified dc power.

In this embodiment, the inverting unit 130 inverts the regulated dc power output by the rectifying unit 120 into a three-phase ac power and outputs the three-phase ac power to the isolation filtering unit 140. The isolation filtering unit 140 includes an isolation transformer 141 and a filtering unit 142.

The stability of the power supply is improved by providing the isolation transformer 141, wherein the primary winding of the isolation transformer 141 is connected to the output terminal of the inverter unit 130, the filter capacitor is connected to both ends of the secondary winding of the isolation transformer 141, and the filter unit 142 is formed by the secondary winding impedance of the isolation transformer 141 and the filter capacitor.

The isolation transformer 141 is a three-phase transformer, and each phase of the three-phase transformer is connected to a respective three-phase ac power. Referring to fig. 1, a filter capacitor C2 is connected between each two-phase secondary winding of the isolation transformer 141, the isolation transformer 141 performs isolation voltage reduction, the isolation transformer 141 impedance and the filter capacitor C2 form a filter unit 142, and the three-phase alternating current obtained by inversion is filtered, so that a stable AC380V power supply is output. The isolation filtering unit 140 performs isolation filtering processing on the received three-phase alternating current, and outputs the alternating current after the isolation filtering processing to the train electric equipment 150.

The function of obtaining electric energy from the pantograph and supplying power to the electric equipment of the train has been realized by the above structure. However, since it is necessary to obtain electric energy from the pantograph under the condition of the electric railway, only the function of supplying electric power to the electric equipment for a train under the condition of the electric railway can be realized by the above-described configuration, and electric power cannot be supplied to the electric equipment for a train under the condition of the non-electric railway.

To this end, the train power supply system in this embodiment further includes:

a bidirectional rectifying and inverting unit 160 and a battery pack 170.

The first end of the bidirectional rectification inverter unit 160 is connected with the output end of the filter unit 140, the first end is also connected with the train electric equipment 150, the second end of the bidirectional rectification inverter unit 160 is connected with the storage battery pack 170, and the storage battery pack 170 is charged after the alternating current output by the filter unit 140 is rectified; and the dc power output from the battery pack 170 is inverted and output to the train power consumption equipment 150. The battery pack 170 stores energy after receiving the dc power output from the bidirectional rectifying and inverting unit 160, and discharges the energy when the filtering unit 140 cannot provide ac power.

In this embodiment, the output end of the isolation filter unit 140 is connected to not only the train power consumption device 150, but also the first end of the bidirectional rectification inverter unit 160.

The bidirectional rectifying/inverting unit 160 has a structure having both rectifying and inverting functions.

Under the condition of an electrified railway, namely under the condition that electric energy can be obtained from a pantograph, alternating current which can be used by train electric equipment is output through the output end of the isolation filtering unit 140, so that the power supply of the train electric equipment is realized, meanwhile, the alternating current is received by the bidirectional rectification and inversion unit 160, the alternating current is rectified by the bidirectional rectification and inversion unit 160, and direct current is obtained after rectification and is used for charging the storage battery pack 170.

Under the condition of no power supply to the electrified railway, that is, under the condition that electric energy cannot be obtained from the pantograph, the output end of the isolation filtering unit 140 cannot output alternating current for the train electric equipment and cannot supply power to the train electric equipment, at this time, the storage battery pack 170 releases electric energy and outputs direct current to the bidirectional rectification inverting unit 160. The bidirectional rectification inversion unit 160 receives the direct current, the bidirectional rectification inversion unit 160 is used for carrying out inversion processing on the direct current, and alternating current capable of being used by train electric equipment is obtained after the inversion processing, so that power supply for the train electric equipment is achieved.

Because the storage battery pack 170 is used for discharging electricity to supply power for the train electric equipment under the condition of no-electricity gasification railways, namely, the storage battery pack 170 is only used as an emergency power supply, the electric quantity which can be stored only needs to be ensured to support emergency use, so that the storage battery pack is small in size, and the size and the cost of the storage battery pack are effectively reduced. And the storage battery pack is not used for discharging to supply power for the electric equipment of the train in a normal state, so that the problem that the service life of the storage battery pack is shortened due to frequent charging and discharging of the storage battery pack is solved.

And because the storage battery pack is charged while the power supply is carried out on the train power utilization equipment, extra charging time is not needed, the use efficiency is improved, and a matched charging pile is not needed to be additionally arranged on the storage battery pack, so that the system cost is reduced.

According to the train power supply system disclosed by the embodiment, under the condition of an electrified railway, electric energy is obtained from a pantograph through a traction transformer, rectified direct current is subjected to voltage stabilization through rectification of a rectification unit and a direct current support capacitor, inversion of an inversion unit and isolation filtering of an isolation filtering unit supply power to electric equipment of a train, and meanwhile alternating current provided by the isolation filtering unit is rectified through a bidirectional rectification inversion unit and then charges a storage battery pack; the alternating current is provided for the train electric equipment after the discharge of the storage battery pack and the inversion of the bidirectional rectifying and inverting unit under the condition of no electricity of the electrified railway. The problem that the train is high in cost due to the fact that the air-conditioning generator car is additionally arranged is solved, electric energy is provided by means of diesel oil combustion, environment pollution is serious, and potential safety hazards are caused due to diesel oil leakage.

Generally, a train has a plurality of cars, each car includes train electric equipment, such as lighting equipment, refrigeration equipment, and the like, and therefore, power needs to be provided for the train electric equipment on each car.

In the embodiment, the filtered and outputted alternating current is provided to train electric equipment on each carriage through the power supply connector 180.

Specifically, referring to fig. 1, the power supply connector 180 includes a power supply connector socket to which an output terminal of the isolation filter unit 140 is connected, and a power supply connector plug connected to a 380V through bus of the train. When the power supply connector plug is used, the power supply connector plug is inserted into the matched power supply connector socket, so that alternating current after isolation and filtration is transmitted to a 380V through bus of a train, train electric equipment on each carriage of the train is respectively hung on the 380V through bus, namely, the train electric equipment is connected with the through bus, the train electric equipment on each carriage can obtain electric energy from the 380V through bus, and normal operation of the train electric equipment on each carriage is guaranteed.

An alternating current contactor KM1 is further arranged between the isolation filtering unit 140 and the power supply connector socket. When the alternating current contactor KM1 is closed, 380V alternating current can be provided for the train electric equipment 150 through the power supply system of the embodiment; when the ac contactor KM1 is opened, the power supply system of the present embodiment cannot be used to supply power to the electric equipment 150 for train.

Because two power supply loops are provided in the embodiment, the first power supply loop provides power for the electric equipment on each carriage of the train after rectification, voltage stabilization, inversion and isolation filtering for acquiring electric energy from the pantograph through the traction transformer, and the second power supply loop provides power for the electric equipment on each carriage of the train through the storage battery pack. The storage battery pack is in a standby power supply mode, and the standby power supply loop of the storage battery pack is used for supplying power only when the first power supply loop is in a no-electricity condition or the first power supply loop is in a fault state. In order to realize the switching between the two power supply loops, so that the two power supply loops are not affected, the power supply system of the embodiment further includes an ac contactor KM 2.

One end of the alternating current contactor KM2 is connected with the 380V through bus, and the other end of the alternating current contactor KM2 is connected with the bidirectional rectification inversion unit 160 and the train electric equipment on each carriage respectively, so that when the alternating current contactor KM2 is in a closed state, alternating current is provided for the train electric equipment on each carriage through the 380V through bus, and when the alternating current contactor KM2 is in an open state, the alternating current is provided for the train electric equipment on each carriage through the storage battery 170 after inversion of the bidirectional rectification inversion unit 160.

Under the condition that the train electric equipment on each carriage of the train is powered by using the first power supply loop, the alternating current contactor KM2 is controlled to be closed so as to directly supply the filtered alternating current to the train electric equipment on each carriage. Meanwhile, the alternating current is rectified into direct current by the bidirectional rectification and inversion unit 160, and the battery pack 170 is charged.

Under the condition that the second power supply loop is used for supplying power to train electric equipment on each carriage of the train, the alternating current contactor KM2 is controlled to be disconnected, the storage battery pack 170 is controlled to discharge, direct current output by the storage battery pack 170 is inverted into alternating current through the bidirectional rectification inversion unit 160, then the power is supplied to the train electric equipment on each carriage, and meanwhile, the influence of the discharge loop of the storage battery pack 170 on the first power supply loop is avoided by controlling the alternating current contactor KM2 to be disconnected.

The train power supply system disclosed by the embodiment can be applied to a cold chain transport train to supply power to refrigeration equipment on the cold chain transport train.

The present embodiment provides another embodiment, which is different from the power supply system shown in fig. 1 in the way of obtaining power from the pantograph. In the embodiment, the electric energy is obtained by the traction converter connected behind the traction transformer.

Specifically, the traction converter is composed of a single-phase three-level pulse rectifier, an intermediate direct current circuit, a three-level inverter, a vacuum alternating current contactor and other main circuit equipment, a traction control device and the like.

Specifically, an input end of the single-phase three-level pulse rectifier is connected to the traction transformer 110, an output end of the single-phase three-level pulse rectifier is connected to the intermediate dc circuit, and the low-voltage ac power converted by the traction transformer is rectified and then dc power is output through the intermediate dc circuit.

The subsequent processing of the direct current is similar to the processing of the direct current by the power supply system shown in fig. 1, and is not described herein again.

By applying the train power supply system disclosed above, an embodiment of the present application further provides a train power supply method, as shown in fig. 4, the train power supply method may include the following steps:

s401, determining whether electric energy can be obtained from a pantograph;

if it is determined that the power can be obtained from the pantograph, performing step S402;

if it is determined that the power cannot be obtained from the pantograph, step S403 is performed.

Whether power can be drawn from the pantograph is determined by determining whether the train is in an electrified railroad condition. Wherein, under the condition of the electrified railway, the electric energy can be obtained from the pantograph, and if the electric railway is not under the condition, the electric energy can not be obtained from the pantograph.

S402, converting high-voltage alternating current acquired from a pantograph into low-voltage alternating current through the traction transformer, rectifying the low-voltage alternating current through the rectifying unit, outputting direct current, stabilizing the rectified direct current through the direct current supporting capacitor, and outputting the stabilized direct current to the inverting unit; inverting the direct current into three-phase alternating current through the inverting unit, outputting the three-phase alternating current to the isolation filtering unit, performing isolation filtering processing on the received three-phase alternating current through the isolation filtering unit, and outputting the alternating current after the isolation filtering processing to the train electric equipment; and the bidirectional rectification inversion unit rectifies the alternating current output by the filtering unit and then charges the storage battery pack.

And S403, controlling the storage battery pack to discharge, inverting the received direct current through the bidirectional rectification inversion unit, and outputting the inverted direct current to the train electric equipment.

Optionally, in order to avoid that the switched storage battery pack discharging circuit affects the previous power supply circuit after the power supply circuit is switched, the ac contactor is controlled to be turned off before the storage battery pack is controlled to discharge.

By the train power supply method disclosed by the embodiment, not only can the train be powered under the electrified railway condition, but also the train can be powered under the non-electrified railway condition.

It should be noted that, in the case where it is determined that the electric energy can be obtained from the pantograph, in addition to converting the high-voltage ac power obtained from the pantograph into the low-voltage ac power by the traction transformer and outputting the dc power after rectifying the low-voltage ac power by the rectifying unit, the low-voltage ac power may be rectified by a single-phase three-level pulse rectifier in the traction converter connected behind the traction transformer and outputting the dc power by an intermediate dc circuit in the traction converter.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A train power supply system, comprising:

the train power utilization system comprises a traction transformer, a rectifying unit, a direct current supporting capacitor, an inverting unit, an isolation filtering unit and train power utilization equipment which are sequentially connected; the isolation filtering unit comprises an isolation transformer and a filtering unit;

the traction transformer converts high-voltage alternating current acquired from the pantograph into low-voltage alternating current;

the rectification unit acquires low-voltage alternating current from a secondary winding of the traction transformer, rectifies the acquired low-voltage alternating current to obtain direct current, stabilizes the rectified direct current through the direct current support capacitor, and outputs the stabilized direct current to the inversion unit;

the inversion unit inverts the direct current into a three-phase alternating current and outputs the three-phase alternating current to the isolation filtering unit;

the isolation filtering unit is used for carrying out isolation filtering processing on the received three-phase alternating current and outputting the alternating current subjected to the isolation filtering processing to the train electric equipment;

further comprising:

a bidirectional rectification inversion unit and a storage battery pack;

the first end of the bidirectional rectification inversion unit is connected with the output end of the filter unit, the first end of the bidirectional rectification inversion unit is also connected with the train electric equipment, and the second end of the bidirectional rectification inversion unit is connected with the storage battery pack and used for rectifying the alternating current output by the filter unit and then charging the storage battery pack; inverting the direct current output by the storage battery pack and outputting the inverted direct current to the train electric equipment;

the storage battery pack stores energy after receiving the direct current output by the bidirectional rectification inversion unit and discharges under the condition that the filtering unit does not output alternating current.

2. The power supply system according to claim 1, wherein the filter unit includes:

the secondary winding impedance and the filter capacitance of the isolation transformer.

3. The power supply system according to claim 1 or 2, characterized by further comprising: a power supply connector;

then, the connecting the filter unit and the train electric equipment includes:

the output end of the filtering unit is connected with one end of a power supply connector, and the other end of the power supply connector is connected with a through bus of the train;

and the run-through bus is respectively connected with the train electric equipment on each carriage of the train to supply power to the train electric equipment on each carriage.

4. The power supply system of claim 3, further comprising: an AC contactor;

alternating current contactor's one end with link up the bus connection, alternating current contactor's the other end with train consumer on two-way rectification contravariant unit and every section carriage is connected respectively, with alternating current contactor is when the on-state, through link up the bus and provide the alternating current for the train consumer on every section carriage, and when alternating current contactor is in the off-state, through storage battery passes through for the train consumer on every section carriage supplies power behind the contravariant of two-way rectification contravariant unit.

5. The power supply system of claim 4, wherein the train is a cold chain transport train and the train electrical equipment is refrigeration equipment.

6. A train power supply system, comprising:

the system comprises a traction transformer, a traction converter, a direct current support capacitor, an inversion unit, an isolation filtering unit and train electric equipment which are connected in sequence; the isolation filtering unit comprises an isolation transformer and a filtering unit;

the traction transformer converts high-voltage alternating current acquired from the pantograph into low-voltage alternating current;

the traction converter comprises a single-phase three-level pulse rectifier and an intermediate direct current circuit, wherein the input end of the single-phase three-level pulse rectifier is connected with the traction transformer, the output end of the single-phase three-level pulse rectifier is connected with the intermediate direct current circuit, and low-voltage alternating current converted by the traction transformer is rectified and then outputs direct current through the intermediate direct current circuit; the rectified direct current is stabilized through the direct current supporting capacitor, and the stabilized direct current is output to the inversion unit;

the inversion unit inverts the direct current into a three-phase alternating current and outputs the three-phase alternating current to the isolation filtering unit;

the isolation filtering unit is used for carrying out isolation filtering processing on the received three-phase alternating current and outputting the alternating current subjected to the isolation filtering processing to the train electric equipment;

further comprising:

a bidirectional rectification inversion unit and a storage battery pack;

the first end of the bidirectional rectification inversion unit is connected with the output end of the filter unit, the first end of the bidirectional rectification inversion unit is also connected with the train electric equipment, and the second end of the bidirectional rectification inversion unit is connected with the storage battery pack and used for rectifying the alternating current output by the filter unit and then charging the storage battery pack; inverting the direct current output by the storage battery pack and outputting the inverted direct current to the train electric equipment;

the storage battery pack stores energy after receiving the direct current output by the bidirectional rectification inversion unit and discharges under the condition that the filtering unit does not output alternating current.

7. The train power supply system of claim 6 wherein the train is a cold chain transport train and the train electrical equipment is refrigeration equipment.

8. A train power supply method applied to the power supply system of any one of claims 1 to 5, comprising:

determining whether power can be drawn from the pantograph;

if the fact that the electric energy can be obtained from the pantograph is determined, converting high-voltage alternating current obtained from the pantograph into low-voltage alternating current through the traction transformer, rectifying the low-voltage alternating current through the rectifying unit, outputting direct current, stabilizing the rectified direct current through the direct current supporting capacitor, and outputting the stabilized direct current to the inverting unit; inverting the direct current into three-phase alternating current through the inverting unit, outputting the three-phase alternating current to the isolation filtering unit, performing isolation filtering processing on the received three-phase alternating current through the isolation filtering unit, and outputting the alternating current after the isolation filtering processing to the train electric equipment; the bidirectional rectification inversion unit rectifies the alternating current output by the filtering unit and charges the storage battery pack;

and if the fact that the electric energy cannot be obtained from the pantograph is determined, the storage battery pack is controlled to discharge, and the received direct current is inverted through the bidirectional rectifying and inverting unit and then output to the train electric equipment.

9. The power supply method according to claim 8, wherein if it is determined that the power cannot be obtained from the pantograph, the method of controlling the battery pack to discharge and inverting the received direct current by the bidirectional rectifying and inverting unit and outputting the inverted direct current to the train electric equipment includes:

if the fact that the electric energy cannot be obtained from the pantograph is determined, controlling the alternating current contactor to be disconnected;

and controlling the storage battery pack to discharge, inverting the received direct current through the bidirectional rectification inversion unit and outputting the inverted direct current to the train electric equipment.

10. A train power supply method applied to the power supply system of claim 6 or 7, comprising:

determining whether power can be drawn from the pantograph;

if the fact that the electric energy can be obtained from the pantograph is determined, converting high-voltage alternating current obtained from the pantograph into low-voltage alternating current through the traction transformer, rectifying the low-voltage alternating current through a single-phase three-level pulse rectifier in the traction converter, and then outputting direct current through the intermediate direct current circuit; the rectified direct current is stabilized through the direct current supporting capacitor, and the stabilized direct current is output to the inversion unit; inverting the direct current into three-phase alternating current through the inverting unit, outputting the three-phase alternating current to the isolation filtering unit, performing isolation filtering processing on the received three-phase alternating current through the isolation filtering unit, and outputting the alternating current after the isolation filtering processing to the train electric equipment; the bidirectional rectification inversion unit rectifies the alternating current output by the filtering unit and charges the storage battery pack;

and if the fact that the electric energy cannot be obtained from the pantograph is determined, the storage battery pack is controlled to discharge, and the received direct current is inverted through the bidirectional rectifying and inverting unit and then output to the train electric equipment.

Images