CN216216579U - Energy feedback device of rail transit vehicle renewable energy system - Google Patents
Energy feedback device of rail transit vehicle renewable energy system Download PDFInfo
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- CN216216579U CN216216579U CN202122473437.5U CN202122473437U CN216216579U CN 216216579 U CN216216579 U CN 216216579U CN 202122473437 U CN202122473437 U CN 202122473437U CN 216216579 U CN216216579 U CN 216216579U
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Abstract
The application provides a rail transit vehicle renewable energy system's energy feedback device, the device includes: the two three-phase bridge type converter circuits are connected in parallel; the three-phase bridge converter circuit includes: the three-phase converter comprises a three-phase alternating current power grid, a direct current power grid, a plurality of energy feedback branches and a three-phase converter unit, wherein the three-phase converter unit comprises three I GBT bridge arms, each I GBT bridge arm is connected in parallel, each I GBT bridge arm comprises a first I GBT device connected with a positive bus of the direct current power grid and a second I GBT device connected with a negative bus of the direct current power grid, and the first I GBT device and the second I GBT device are connected in series and are both connected with a freewheeling diode in parallel; one end of each energy feedback branch is connected with one-phase voltage in the three-phase alternating current power grid, and the other end of each energy feedback branch is connected with the common connection end of the first I GBT device and the second I GBT device.
Description
Technical Field
The application relates to the technical field of urban rail energy recovery of urban rail transit systems, in particular to an energy feedback device of a rail transit vehicle regenerative energy system.
Background
The regenerative braking energy of the urban rail transit is considerable, namely, when the train is braked, the kinetic energy of the train is converted and reused instead of being converted into heat energy. The regenerative braking energy is about 30% of the traction energy, except that part of the energy is absorbed by the auxiliary power supply system, and the redundant energy can be absorbed or reused by the regenerative braking energy recovery device. Currently, regenerative braking energy utilization devices can be classified into three types: energy absorption device, energy storage device, energy feedback device.
In the urban rail energy recovery system in the prior art, when a fault occurs on the alternating current side, the hybrid energy recovery device needs a brake resistor or a super capacitor to consume or store redundant regenerative brake energy, and the brake resistor and the super capacitor need to be connected with a direct current side bus through a chopper module, so that the cost of the system is increased. The conventional energy feedback power supply system adopts a measure of disconnecting the energy feedback device to protect equipment, so that redundant regenerative braking energy cannot be consumed, the direct current side network voltage is quickly raised, and the safe and stable operation of the urban rail system is seriously influenced.
SUMMERY OF THE UTILITY MODEL
The application aims to provide an energy feedback device of a rail transit vehicle regenerative energy system, which is used for effectively solving the technical defect that the voltage of a direct current network bus cannot be rapidly controlled at a stable level when the direct current network bus is in a braking state in the prior art.
In a first aspect, an embodiment of the present application provides an energy feedback device for a rail transit vehicle regenerative energy system, where the device includes: the two three-phase bridge type converter circuits are connected in parallel; the three-phase bridge converter circuit includes: the three-phase converter comprises a three-phase alternating current power grid, a direct current power grid, a plurality of energy feedback branches and a three-phase converter unit, wherein the three-phase converter unit comprises three IGBT bridge arms, each IGBT bridge arm is connected in parallel, each IGBT bridge arm comprises a first IGBT device connected with a positive bus of the direct current power grid and a second IGBT device connected with a negative bus of the direct current power grid, and the first IGBT device and the second IGBT device are connected in series and are both connected with a freewheeling diode in parallel; one end of each energy feedback branch is connected with one-phase voltage in the three-phase alternating current power grid, and the other end of each energy feedback branch is connected with the common connecting end of the first IGBT device and the second IGBT device.
With reference to the first aspect, in a first possible implementation manner, the energy feedback branch includes: the circuit breaker comprises a first relay, a protective resistor, a fusing resistor, a circuit breaker and a first reactance, wherein one end of the first relay is sequentially connected with the protective resistor and the fusing resistor to form a first branch circuit, the first branch circuit is connected with the circuit breaker in parallel, the parallel connection points are a first connection point and a second connection point respectively, one end of the first connection point is connected with one end of the first reactance, and the other end of the first reactance is connected with a common connection end of a first IGBT device and a second IGBT device.
With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner, each energy feedback branch is connected to a phase voltage in the three-phase ac power grid through a first contactor.
With reference to the first aspect, in a third possible implementation manner, the three-phase converter unit further includes: and the filter capacitor is connected with each IGBT bridge arm in parallel.
With reference to the third possible implementation manner of the first aspect, in a fourth possible implementation manner, the three-phase bridge converter circuit further includes: and the first end of the second contactor is connected with one end of the filter capacitor, the second end of the second contactor is connected with the other end of the filter capacitor, the third end of the second contactor is connected with the positive bus of the direct-current power grid, and the fourth end of the second contactor is connected with the negative bus of the direct-current power grid.
With reference to the first aspect, in a fifth possible implementation manner, the three-phase bridge converter circuit further includes: and one end of the pre-charging circuit is connected with the positive bus of the direct-current power grid, and the other end of the pre-charging circuit is connected with the third end of the second contactor.
With reference to the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner, the precharge circuit includes a first branch, a second branch, and a third branch, and the precharge circuit includes: the first branch circuit is formed by connecting the second relay and the pre-charging resistor in series, the branch circuit corresponding to the third relay is the second branch circuit, the branch circuit corresponding to the fourth relay is the third branch circuit, and the first branch circuit, the second branch circuit and the third branch circuit are all connected in parallel.
With reference to the sixth possible implementation manner of the first aspect, in a seventh possible implementation manner, the pre-charging circuit is connected to a positive bus of the dc power grid through a second reactance.
Compared with the prior art, the utility model has the beneficial effects that: on one hand, the circuit breakers or isolating switches are arranged on the direct current side and the alternating current side of the energy feedback device, so that two paths of three-phase bridge type current transformation circuits with consistent structures in the energy feedback device can be isolated from each other and can operate independently. On the other hand, when the vehicle is in a braking state, the energy feedback device monitors the direct-current voltage of the direct-current power grid, when the voltage of the direct-current power grid rises to reach the starting threshold of the energy feedback device, the energy feedback device is quickly started to be in a variable-current running state, the inversion feedback of regenerative braking electric energy of the traffic vehicle to the medium-voltage alternating-current power supply network is realized, and meanwhile, the voltage of a bus of the direct-current power grid is controlled to be at a stable level.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is an electrical connection diagram of an energy feedback device of a rail transit vehicle regenerative energy system according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
Referring to fig. 1, an embodiment of the present application provides an energy feedback device of a rail transit vehicle regenerative energy system, where the device includes: the two three-phase bridge type converter circuits are connected in parallel; the three-phase bridge converter circuit includes: the three-phase converter comprises a three-phase alternating current power grid, a direct current power grid, a plurality of energy feedback branches and a three-phase converter unit, wherein the three-phase converter unit comprises three IGBT bridge arms, each IGBT bridge arm is connected in parallel, each IGBT bridge arm comprises a first IGBT device connected with a positive bus of the direct current power grid and a second IGBT device connected with a negative bus of the direct current power grid, and the first IGBT device and the second IGBT device are connected in series and are both connected with a freewheeling diode in parallel; one end of each energy feedback branch is connected with one-phase voltage in the three-phase alternating current power grid, and the other end of each energy feedback branch is connected with the common connecting end of the first IGBT device and the second IGBT device.
Specifically, the energy feedback device of the rail transit vehicle renewable energy system in the embodiment of the present application includes two three-phase bridge type converter circuits with identical structures, where the two three-phase bridge type converter circuits are connected in parallel, and each three-phase bridge type converter circuit has an input end connected to a three-phase alternating current power grid and an output end connected to a direct current power grid. In the embodiment of the application, the energy feedback device has two input ends, and the output ends of the two-way three-phase bridge type current transformation circuit are connected together, so that the energy feedback device has two input ends and one output end.
As a possible implementation, the energy feedback branch comprises: the circuit breaker comprises a first relay, a protective resistor, a fusing resistor, a circuit breaker and a first reactance, wherein one end of the first relay is sequentially connected with the protective resistor and the fusing resistor to form a first branch circuit, the first branch circuit is connected with the circuit breaker in parallel, the parallel connection points are a first connection point and a second connection point respectively, one end of the first connection point is connected with one end of the first reactance, and the other end of the first reactance is connected with a common connection end of a first IGBT device and a second IGBT device.
The energy feedback branch is arranged on an alternating current cabinet, and optionally, the alternating current cabinet is a 10KV switch cabinet; the first reactance is used as an isolating switch to realize the mutual isolation between the energy feedback branch and the three-phase current transformation unit and the isolation between the energy feedback branch and the energy feedback branch of the other branch. In the embodiment of the application, each energy feedback branch is respectively connected with a phase voltage in a three-phase alternating current power grid through a first contactor. The three-phase alternating current network outputs three-phase voltage, and correspondingly, each three-phase bridge type current transformation circuit comprises 3 energy feedback branches.
As a possible implementation, the three-phase converter unit further includes: the filter capacitor is connected with each IGBT bridge arm in parallel; and the three-phase bridge converter circuit further comprises: and the first end of the second contactor is connected with one end of the filter capacitor, the second end of the second contactor is connected with the other end of the filter capacitor, the third end of the second contactor is connected with the positive bus of the direct-current power grid, and the fourth end of the second contactor is connected with the negative bus of the direct-current power grid. The three-phase converter unit is arranged on the AC cabinet, and the second contactor is used as an isolating switch between the three-phase AC unit and the DC power grid, so that the mutual isolation between the three-phase AC unit and the three-phase AC unit in the other three-phase bridge converter circuit is realized, and the isolation between the AC cabinet corresponding to the three-phase AC unit and the DC power grid is realized.
As a possible implementation, the three-phase bridge converter circuit further includes: and one end of the pre-charging circuit is connected with the positive bus of the direct-current power grid, and the other end of the pre-charging circuit is connected with the third end of the second contactor. The pre-charge circuit comprises a first branch, a second branch and a third branch, and comprises: the first branch circuit is formed by connecting the second relay and the pre-charging resistor in series, the branch circuit corresponding to the third relay is the second branch circuit, the branch circuit corresponding to the fourth relay is the third branch circuit, and the first branch circuit, the second branch circuit and the third branch circuit are all connected in parallel. In the embodiment of the present application, the pre-charging circuit is installed on a DC cabinet, and optionally, the DC cabinet may be a DC cabinet of 750V DC or a DC cabinet of 1500V DC. The pre-charging circuit is connected with a positive bus of the direct current power grid through a second reactance.
In the embodiment of the application, the energy feedback device is arranged in the traction substation, when a train is in a traction state, a 24-pulse diode rectifier unit of the traction substation provides traction electric energy for the train, the energy feedback device is in a standby state, namely, the energy feedback device does not provide electric energy for a traction network and does not feed back the electric energy for a three-phase alternating current network, and no power flows in a connecting loop of the energy feedback device.
When the train is in a braking state, the train feeds back electric energy to the traction network. When the train feeds back the electric energy and cannot be absorbed by the on-line running traction train, the electric energy is accumulated in the traction network system, and the accumulated electric energy causes the traction network pressure of the traction network system to rise. The energy feedback device monitors the direct current voltage of the traction network and the voltage of the medium-voltage power supply network, when the voltage of the traction network reaches the starting threshold of the energy feedback device, the energy feedback device is quickly started to be in a current transformation running state, so that the inversion feedback of the regenerated braking electric energy of the train to the medium-voltage alternating current power supply network is realized, and the direct current bus voltage of the traction substation is controlled at a stable level.
When the voltage of the traction network is reduced and reaches the threshold value of the energy feedback device for stopping operation, the device stops energy feedback, and the energy feedback device is recovered to the standby state.
In summary, the embodiment of the present application provides an energy feedback device of a rail transit vehicle regenerative energy system, and the device includes: the two three-phase bridge type converter circuits are connected in parallel; the three-phase bridge converter circuit includes: the three-phase converter comprises a three-phase alternating current power grid, a direct current power grid, a plurality of energy feedback branches and a three-phase converter unit, wherein the three-phase converter unit comprises three IGBT bridge arms, each IGBT bridge arm is connected in parallel, each IGBT bridge arm comprises a first IGBT device connected with a positive bus of the direct current power grid and a second IGBT device connected with a negative bus of the direct current power grid, and the first IGBT device and the second IGBT device are connected in series and are both connected with a freewheeling diode in parallel; one end of each energy feedback branch is connected with one-phase voltage in the three-phase alternating current power grid, and the other end of each energy feedback branch is connected with the common connecting end of the first IGBT device and the second IGBT device.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. An energy feedback device of a rail transit vehicle regenerative energy system, the device comprising: the two paths of three-phase bridge type converter circuits are connected in parallel;
the three-phase bridge converter circuit comprises: the three-phase converter comprises a three-phase alternating current power grid, a direct current power grid, a plurality of energy feedback branches and a three-phase converter unit, wherein the three-phase converter unit comprises three IGBT bridge arms, each IGBT bridge arm is connected in parallel, each IGBT bridge arm comprises a first IGBT device connected with a positive bus of the direct current power grid and a second IGBT device connected with a negative bus of the direct current power grid, and the first IGBT device and the second IGBT device are connected in series and are both connected with a freewheeling diode in parallel;
one end of each energy feedback branch is connected with one-phase voltage in the three-phase alternating current power grid, and the other end of each energy feedback branch is connected with the common connection end of the first IGBT device and the second IGBT device.
2. The energy feedback device of the rail transit vehicle regenerative energy system according to claim 1, wherein the energy feedback branch comprises: first relay, protective resistor, fusing resistor, circuit breaker and first reactance, the one end of first relay connects gradually protective resistor with fusing resistor forms first branch road, first branch road with circuit breaker parallel connection, parallel connection point are first tie point and second tie point respectively, the one end of first tie point with the one end of first reactance is connected, the other end of first reactance with first IGBT device with the common connection end of second IGBT device is connected.
3. The energy feedback device of the rail transit vehicle regenerative energy system according to claim 2, wherein each energy feedback branch is connected to a phase voltage of the three-phase ac power grid through a first contactor.
4. The energy feedback device of rail transit vehicle renewable energy system of claim 1, wherein said three-phase converter unit further comprises: and the filter capacitor is connected with each IGBT bridge arm in parallel.
5. The energy feedback device of rail transit vehicle renewable energy system of claim 4, wherein said three-phase bridge converter circuit further comprises: and the first end of the second contactor is connected with one end of the filter capacitor, the second end of the second contactor is connected with the other end of the filter capacitor, the third end of the second contactor is connected with the positive bus of the direct current power grid, and the fourth end of the second contactor is connected with the negative bus of the direct current power grid.
6. The energy feedback device of rail transit vehicle renewable energy system of claim 5, wherein said three-phase bridge converter circuit further comprises: and one end of the pre-charging circuit is connected with the positive bus of the direct-current power grid, and the other end of the pre-charging circuit is connected with the third end of the second contactor.
7. The energy feedback device of the rail transit vehicle regenerative energy system according to claim 6, wherein the pre-charge circuit comprises a first branch, a second branch and a third branch, the pre-charge circuit comprises: second relay, third relay, fourth relay and pre-charge resistance, first branch road does the second relay with pre-charge resistance series connection forms, the branch road that the third relay corresponds does the second branch road, the branch road that the fourth relay corresponds does the third branch road, first branch road the second branch road with be parallel connection between the third branch road.
8. The energy feedback device of the rail transit vehicle regenerative energy system according to claim 7, wherein the pre-charge circuit is connected to a positive bus of the dc power grid through a second reactance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202122473437.5U CN216216579U (en) | 2021-10-12 | 2021-10-12 | Energy feedback device of rail transit vehicle renewable energy system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122473437.5U CN216216579U (en) | 2021-10-12 | 2021-10-12 | Energy feedback device of rail transit vehicle renewable energy system |
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| CN216216579U true CN216216579U (en) | 2022-04-05 |
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| CN202122473437.5U Active CN216216579U (en) | 2021-10-12 | 2021-10-12 | Energy feedback device of rail transit vehicle renewable energy system |
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