CN111064177B - Direct current conflux device, direct current conflux cabinet and energy feedback system of track traffic - Google Patents
Direct current conflux device, direct current conflux cabinet and energy feedback system of track traffic Download PDFInfo
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- CN111064177B CN111064177B CN201811204216.4A CN201811204216A CN111064177B CN 111064177 B CN111064177 B CN 111064177B CN 201811204216 A CN201811204216 A CN 201811204216A CN 111064177 B CN111064177 B CN 111064177B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
- B60M3/06—Arrangements for consuming regenerative power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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- Power Engineering (AREA)
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- Direct Current Feeding And Distribution (AREA)
Abstract
The invention provides a direct current convergence device, a direct current convergence cabinet and an energy feedback system of rail transit, wherein the direct current convergence device comprises a convergence circuit, the convergence circuit comprises an input end and an output end, the convergence circuit is connected with a front-end switch cabinet through the input end, and the convergence circuit is connected with branch rear-end equipment through the output end; a first interface arranged corresponding to the branch rear-end equipment; the controller is connected with the branch rear-end equipment through the first interface and used for receiving the return detection signal sent by the branch rear-end equipment, judging whether the branch rear-end equipment breaks down or not according to the return detection signal and controlling the confluence circuit when the branch rear-end equipment breaks down. The direct current confluence device only keeps the confluence function, uses few devices and has low working complexity, thereby reducing the probability of error occurrence and improving the safety factor of the system.
Description
Technical Field
The invention relates to the technical field of rail transit, in particular to a direct current junction device, a direct current junction cabinet and an energy feedback system of rail transit.
Background
In the energy feedback system, the junction device is used as a wiring device, has a junction function, and can ensure the orderly connection of all devices in the system, so that the system is easy to cut off related circuits during maintenance and inspection, and the power failure range is reduced.
In the related art, the current collecting device is integrated with a current collecting function, a current transforming function, an energy storage function, a battery management function and the like, that is, the current collecting device, the energy storage device, the current transforming device, the battery management device and the like are all arranged in the current collecting device, so that the energy density of the battery is reduced, the product competitiveness is low, the overall mean failure-free working time of the current collecting device can be reduced, the maintenance is inconvenient, the current collecting device cannot be applied to various occasions, and the compatibility is low.
Disclosure of Invention
The present invention is directed to solving, at least in part, one of the technical problems in the related art.
Therefore, a first object of the present invention is to provide a dc junction device, which has a junction function, uses fewer devices, and has low operation complexity, thereby reducing the probability of error occurrence and increasing the safety factor of the system.
The second objective of the present invention is to provide a dc combiner box.
The third objective of the present invention is to provide an energy feedback system for rail transit.
In order to achieve the above object, a first embodiment of the present invention provides a dc junction device, which can be connected to an energy feedback system of rail transit, the dc junction device includes a junction circuit, the junction circuit includes an input end and an output end, the junction circuit is connected to a front-end switch cabinet through the input end, and the junction circuit is connected to a branch rear-end device through the output end; a first interface arranged corresponding to the branch rear-end equipment; the controller is connected with the branch rear-end equipment through the first interface and used for receiving the return detection signal sent by the branch rear-end equipment, judging whether the branch rear-end equipment fails or not according to the return detection signal and controlling the confluence circuit when the branch rear-end equipment fails.
The direct current confluence device only keeps the confluence function of the traditional confluence device, uses fewer devices, controls the confluence circuit through the controller according to the return detection signal sent by the branch rear-end equipment, and has low working complexity, so that the error occurrence probability is reduced, and the safety coefficient of the system is improved.
In addition, the dc bus device according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the number of the output terminals and the branch circuit back-end devices is multiple, the bus circuit further includes a main circuit, multiple branch circuits, and multiple contactors, wherein one end of each branch circuit is connected to the main circuit through one contactor, the main circuit is connected to the front-end switch cabinet through the input terminal, and the other end of each branch circuit is connected to one branch circuit back-end device through one output terminal; the controller is used for controlling the contactor corresponding to the branch rear-end equipment to be disconnected when the fault of the branch rear-end equipment is judged, so that the branch corresponding to the branch rear-end equipment is disconnected with the main loop.
According to an embodiment of the present invention, the dc link device further includes: the fault detection device is respectively connected with each branch and used for detecting whether each branch has a fault; the controller is connected with the fault detection device, and is further used for sending a stop signal to the branch rear-end equipment corresponding to the branch through the first interface corresponding to the branch rear-end equipment when the branch fails, so that the branch rear-end equipment stops working, and/or controlling the contactor corresponding to the branch to be disconnected.
According to an embodiment of the present invention, the bus circuit further includes: an isolator switch connected between the main circuit and the input terminal, wherein the dc link device further includes: a second interface corresponding to the front-end switch cabinet; the controller is connected with the front-end switch cabinet through the second interface, and is further configured to determine a state of the main loop according to an interlocking signal sent by the front-end switch cabinet when the interlocking signal is received through the second interface, and prohibit the disconnecting switch from performing switching-off and switching-on operations when the main loop is electrified.
According to an embodiment of the present invention, the dc link device further includes: the controller is connected with the remote monitoring equipment through the third interface; the controller is further configured to send a stop signal to the plurality of branch line back-end devices through the plurality of first interfaces when the dc bus device has a serious warning, and output a joint jump signal to the remote monitoring device through the third interface, so that the remote monitoring device controls the isolating switch to cut off the dc bus device from the energy feedback system.
According to an embodiment of the present invention, the dc bus device is disposed in a cabinet, and a cabinet door is disposed corresponding to the cabinet, wherein the controller determines that a serious warning occurs in the dc bus device when at least one of a failure occurs in all the branches, a frame protection operation occurs, and the cabinet door is opened.
According to an embodiment of the present invention, the controller is further configured to send a switch-on allowing signal to the front-end switch cabinet through the second interface when the energy feedback system returns to normal, so as to allow the front-end switch cabinet to be switched on.
According to an embodiment of the present invention, the dc link device further includes: the controller is connected with auxiliary equipment through the fourth interface; the auxiliary equipment comprises fire fighting equipment, and the controller judges that the direct current junction device gives a serious warning when receiving a fire fighting linkage signal sent by the fire fighting equipment through the fourth interface.
According to an embodiment of the invention, the first interface, the second interface, the third interface and the fourth interface are all passive dry contact interfaces.
According to one embodiment of the invention, the branch back-end equipment comprises energy storage equipment and converter equipment.
According to one embodiment of the invention, the bus circuit further comprises a plurality of fuses, wherein each branch circuit is connected in series with at least one fuse, and the main circuit is connected in series with at least one fuse.
According to one embodiment of the invention, the busbar circuit further comprises lightning arresters connected to the positive and negative ends of the main circuit.
In order to achieve the above object, a dc combiner cabinet according to a second aspect of the present invention includes a cabinet and the dc combiner apparatus according to the above embodiments of the present invention, wherein the dc combiner apparatus is disposed in the cabinet.
According to the direct current confluence cabinet, the direct current confluence device is adopted, the direct current confluence device only keeps the confluence function of the traditional confluence device, the number of used devices is less, the controller controls the confluence circuit according to the return detection signal sent by the branch rear-end equipment, the working complexity is low, the error occurrence probability is reduced, and the safety coefficient of a system is improved.
In order to achieve the above object, a third aspect of the present invention provides an energy feedback system for rail transit, including: a front-end switch cabinet; a plurality of branch back-end devices; the direct current collecting cabinet.
According to the energy feedback system of the rail transit, the direct current junction box is adopted, the direct current junction box only keeps the junction function of the traditional junction box, the number of used devices is less, the junction circuit is controlled through the controller according to the return detection signal sent by the branch rear-end equipment, the working complexity is low, the error occurrence probability is reduced, and the safety coefficient of the system is improved.
In addition, the energy feedback system for rail transit according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the energy feedback system for rail transit further includes: remote monitoring equipment and auxiliary equipment.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block schematic diagram of a DC combiner device according to one embodiment of the present disclosure;
FIG. 2 is a block diagram of a DC combiner, according to one embodiment of the present invention;
FIG. 3 is a block schematic diagram of a DC combiner device according to another embodiment of the present invention;
FIG. 4 is a block schematic diagram of a DC link according to yet another embodiment of the present invention;
FIG. 5 is a communication schematic of a DC bus apparatus according to one embodiment of the present disclosure;
fig. 6 is a schematic structural view of a dc bus device according to an example of the present invention;
FIG. 7 is a block schematic diagram of a DC combiner cabinet, according to an embodiment of the invention;
FIG. 8 is a block diagram of an energy feedback system for rail traffic according to one embodiment of the present invention; and
fig. 9 is a block diagram of an energy feedback system for rail transit according to another embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The dc bus device, the dc bus cabinet and the energy feedback system of the rail transit according to the embodiment of the present invention will be described with reference to fig. 1 to 9.
Fig. 1 is a block schematic diagram of a dc link according to an embodiment of the present invention.
In the embodiment of the invention, the dc link device 100 can be connected to an energy feedback system of rail traffic. As shown in fig. 1, the dc link device 100 includes a link circuit 10, a first interface c1, and a controller 30.
The bus circuit 10 includes an input terminal i and an output terminal o, the bus circuit 10 is connected to the front-end switch cabinet 200 through the input terminal i, and the bus circuit 10 is connected to the branch rear-end device 300 through the output terminal o. The first interface c1 is disposed corresponding to the branch back-end device 300, wherein the first interface c1 may be a passive dry contact interface. The controller 30 is connected to the branch circuit back-end device 300 through the first interface c1, and the controller 30 is configured to receive a return detection signal sent by the branch circuit back-end device 300, determine whether the branch circuit back-end device 300 fails according to the return detection signal, and control the bus circuit 10 when the branch circuit back-end device fails.
In this embodiment, the branch backend device 300 includes an energy storage device (e.g., an energy storage battery), an inverter device, and the like.
It should be noted that the dc bus device 100 of the embodiment of the invention can be used as a wiring device in an energy feedback system, and is used for ensuring the orderly connection of each device in the energy feedback system, and has a bus function.
This direct current device that converges has only kept traditional device that converges function, and used device still less controls the circuit that converges according to the return signal of examining that branch road rear end equipment sent through the controller to the work complexity is low, thereby has reduced the error probability of appearing, has improved the factor of safety of system.
In one embodiment of the present invention, the number of the output terminals o and the branch backend apparatus 300 is multiple. In this embodiment, as shown in fig. 2, the bus circuit 10 further includes a main circuit 11, a plurality of branch circuits 12, and a plurality of contactors 13, wherein one end of each branch circuit 12 is connected to the main circuit 11 through one contactor 13, the main circuit 11 is connected to the front-end switch cabinet 200 through an input terminal i, and the other end of each branch circuit 12 is connected to one branch circuit back-end device 300 through an output terminal o.
The branch back-end device 300 sends a test signal back to the controller 30 through the first interface c1, and the controller 30 is configured to control the contactor 13 corresponding to the branch back-end device 300 to open when it is determined that the branch back-end device 300 has a fault according to the test signal, so that the branch 12 corresponding to the branch back-end device 300 is disconnected from the main circuit 11, and isolation protection of the branch 12 is achieved.
Further, as shown in fig. 3, the dc link device 100 further includes: and a fault detection device 40, wherein the fault detection device 40 is respectively connected with each branch circuit 12 and is used for detecting whether each branch circuit 12 is in fault.
In this embodiment, the controller 30 is connected to the fault detection device 40, and the controller 30 is further configured to send a stop signal to the branch backend apparatus 300 corresponding to the branch 12 through the first interface c1 corresponding to the branch backend apparatus 300 when the branch 12 has a fault, so as to stop the operation of the branch backend apparatus 300, and/or control the contactor 13 corresponding to the branch 12 to open.
Specifically, the faults occurring in the branch circuit 12 may include an overvoltage fault, an overcurrent fault, a leakage fault, and the like. The fault detection device 40 can monitor the working state of each branch 12 in real time, and when an overvoltage fault, an overcurrent fault or an electric leakage fault occurs in a branch 12, the controller 30 can perform the following actions:
1) sending a stop signal to the branch back-end device 300 corresponding to the branch 12 to control the branch back-end device 300 to stop working;
2) after the stop signal is sent to the line back-end device 300, a certain time, such as 30ms, may be delayed to control the contactor 13 corresponding to the branch line 12 to open;
3) directly controlling the corresponding contactor 13 of the branch circuit 12 to be opened.
Therefore, the branch 12 can be isolated from the main loop 11, the protection of the branch 12 is realized, and the work of other branches 13 is not influenced.
Of course, when the branch circuit 12 is recovered to be normal, the controller 30 may also send an activation signal to the branch circuit back-end device 300 through the corresponding first interface c1, so as to activate the branch circuit back-end device 300 and/or control the corresponding contactor 13 to be closed.
That is, when the dc bus device 100 and the branch backend apparatus 300 cannot communicate with each other through a conventional communication method (such as ethernet), the dc bus device 100 can still transmit signals to the branch backend apparatus 300 through the passive dry contact interface, and the dc bus device 100 can continue to operate and control the energy feedback system according to the received signals.
Optionally, in one example, a pre-charge circuit may be provided in the branch 12, as desired.
In one embodiment of the present invention, as shown in fig. 4, the bus circuit 10 further includes a disconnector 14, and the dc bus device 100 further includes a second interface c 2. The isolating switch 14 is connected between the main loop 11 and the input end i; the controller 30 is connected to the front-end switchgear 200 through the second interface c 2. Wherein the second interface c2 is a passive dry contact interface.
In this embodiment, the controller 30 is further configured to determine the state of the main circuit 11 according to the interlock signal when the interlock signal sent by the front-end switch cabinet 200 is received through the second interface c2, and to disable the disconnecting switch 14 from performing the opening and closing operations when the main circuit 11 is electrified.
In the design of the dc bus device 100 according to the embodiment of the present invention, it is considered that the on-load switching capability is not available, and therefore, it is ensured that the line is not loaded before switching on. At this time, the front-end switch cabinet 200 is required to return an interlock signal to clarify the state of the main circuit 11, and when the main circuit 11 is electrified, the dc link device 100 cannot perform switching-off and switching-on operations, that is, the disconnecting switch 14 is prohibited from performing switching-off and switching-on operations.
In an embodiment of the present invention, as shown in fig. 5, the dc link device 100 further includes a third interface c3, wherein the controller 30 is further configured to send a stop signal to all the branch backend apparatuses 300 through all the first interfaces c1 and output a trip signal to the remote monitoring apparatus 400 through the third interface c3 when the dc link device 100 has a serious warning, so that the remote monitoring apparatus 400 controls the isolating switch 14 to cut off the dc link device 100 from the energy feedback system.
Specifically, referring to fig. 6, the dc link device 100 may be disposed inside the cabinet 20, and a cabinet door may be disposed corresponding to the cabinet 20, and it should be understood that the cabinet door is used to isolate the devices inside the cabinet from the outside. In this embodiment, the controller 30 may determine that the dc link device 100 is seriously warned when at least one of a failure of all the branches 12, a frame protection action, and an opening of the cabinet door occurs. The frame protection action refers to an action of removing a fault when the positive electrode is damaged in insulation on the outer shell of the cabinet 20.
Further, the controller 30 is further configured to send a closing permission signal to the front-end switch cabinet 200 through the second interface c2 when the energy feedback system returns to normal, so as to allow the front-end switch cabinet 200 to be closed.
Accordingly, if the energy feedback system is not recovered to normal, the controller 30 in the dc link device 100 may upload the switch-on prohibition signal to the front-end switch cabinet 200 through the second interface c2, and not allow the switch-on of the front-end switch cabinet 200, so as to ensure the safety of the repair and maintenance processes of the lower end (including the dc link device 100 and the branch rear-end device 300), and also avoid the occurrence of secondary damage when the fault is not removed.
In an embodiment of the present invention, as shown in fig. 5, the dc link device 100 further includes a fourth interface c4, and the controller 30 is connected to the auxiliary device 500 through the fourth interface c4, wherein the fourth interface c4 is an ethernet interface, and the auxiliary device 500 includes a fire fighting device, an air conditioning device, and the like.
The fire fighting equipment may send a fire alarm signal to the controller 30 when the dc link device 100 is in a fire, and the controller 30 may determine that the dc link device 100 has a serious warning when receiving the fire alarm signal.
That is, when the dc link device 100 and the front-end switch cabinet 200, the remote monitoring device 400, the fire fighting device, etc. cannot communicate through the conventional communication method (such as ethernet), the dc link device 100 can still transmit signals to the front-end switch cabinet 200, the remote monitoring device 400, the fire fighting device, etc. through the passive dry contact interface, and then the dc link device 100 can continue to operate and control the energy feedback system according to the received signals.
In one embodiment of the present invention, the bus bar circuit 10 further comprises a plurality of fuses 15, wherein each branch 12 is connected in series with at least one fuse 15, and the main circuit 11 is connected in series with at least one fuse 15, so as to perform short-circuit protection on each branch 12 and main circuit 11 respectively. For example, each branch 12 has a fuse 15 connected in series with its positive and negative terminals, and the primary loop 11 has a fuse 15 connected in series with its positive and negative terminals. Of course, only one fuse 15 may be connected in series at one end (e.g., positive end) of the primary circuit 11, and similarly, only one fuse 15 may be connected in series at one end (e.g., positive end) of the branch 12.
Alternatively, the arrangement position of the fuse 15 in the main circuit 11 may be as shown in fig. 6.
Further, the bus circuit 10 may further include an arrester 16, and the arrester 16 is connected to the positive and negative ends of the main circuit 11, so that the dc bus device 100 has a dual lightning protection function and a good lightning protection effect. Of course, the lightning arrester 16 may be connected to only one end (e.g., the positive end) of the primary circuit 11 and grounded.
Alternatively, the position of the surge arrester 16 in the dc link device 100 may be as shown in fig. 6.
It should be noted that, in order to realize the bus function, the bus circuit 10 of the dc bus device 100 according to the embodiment of the present invention may further include a differential current transformer 17, a shunt 18, and the like, and the arrangement positions thereof may be as shown in fig. 6.
As can be seen from the above description, the current collecting function is separated from the current transforming function, the energy storing function, the battery management function, etc. according to the main functional division of the energy feedback system, that is, the dc current collecting device 100 of the present invention only retains the current collecting function. Therefore, the system composition framework can be better configured according to the requirements of the actual application environment, so that the product change difference can be reduced to the minimum when the product requirements are changed.
In the embodiment of the present invention, the dc bus device 100 is used as an external interface of the energy feedback system, and the controller 30 is disposed inside the dc bus device for communicating with the network (e.g., ethernet) such as the rectifier device and the battery management system, so as to realize the interaction of the global system information. Meanwhile, the multi-stage jump signal (i.e. through the passive dry contact interface) designed in the direct current bus device 100 ensures the stable matching between the internal parts of the energy feedback system.
In addition, in the dc bus device 100, the main circuit 11 and the branch circuit 12 are provided with a fuse 15 as a protection element, and a contactor 13 and a pre-charging circuit are added to the branch circuit 12 and controlled by the controller 30. The multi-stage jump signal designed in the dc link device 100 can be used for branch pre-charging before system startup and branch isolation in emergency.
The multi-stage jump function of the dc link device 100 according to the embodiment of the present invention is described below with reference to fig. 5:
specifically, the main circuit 11 side of the dc link device 100 may be set with an interlock signal, a trip signal, and a closing enable signal, the branch circuit 12 side may be set with a start stop signal and a return check signal, and the dc link device 100 may further receive an interlock signal from an auxiliary device (e.g., a fire fighting device, an air conditioning device, etc.).
Further, in an embodiment of the present invention, the linkage signal is classified into the following three levels according to possible abnormal phenomena during the actual operation of the energy feedback system:
the DC combiner 100 does not have any operation condition
The dc link device 100 does not have the on-load switching capability, so it should be ensured that no load is present in the line before switching on. If the dc link device 100 does not have an operation condition, that is, the dc link device 100 and the external device cannot communicate in a conventional manner, at this time, the controller 30 may receive an interlock signal returned by the front-end switch cabinet 200 through the passive dry contact interface, so as to determine the state of the main circuit 11 according to the interlock signal, and when the main circuit 11 is charged, the disconnecting switch 14 in the dc link device 100 is prohibited from performing the opening and closing operations.
Second, branch 12 fails without affecting the operation of other parts of the system
When a branch 12 has an electric leakage fault, an overcurrent fault, an overvoltage fault, or the like and cannot be automatically cut off, the controller 30 sends a stop signal to the corresponding branch rear-end device 300 through the passive dry contact interface, so that the branch rear-end device 300 stops working, and controls the contactor 13 corresponding to the branch 12 to be disconnected, thereby forcibly isolating the branch 12 from the main circuit 11. When the branch rear-end device 300 is in the fault state and cannot continue to operate, the controller 30 determines that the branch rear-end device 300 has a fault according to the return detection signal received through the corresponding passive dry contact interface, and then controls the corresponding contactor 13 to be switched off so as to cut off the corresponding branch 12, and meanwhile, the operation states of other branches 12 are not affected.
Thirdly, the direct current confluence device 100 has serious failure or potential safety hazard, and the system can not continue to operate
When all the branches 12 have faults or potential safety hazards (such as fire alarm, frame protection and cabinet door opening) occur in the dc junction device 100, the controller 30 immediately sends a stop signal to all the branch rear-end devices 300 through corresponding passive dry contacts, and outputs a jump signal to the remote monitoring device 400 through corresponding passive dry contacts, so as to control the disconnection of the circuit breaker in the front-end switch cabinet 200 through the remote monitoring device 400, cut off the dc junction device 100 from the system, and reduce fault damage.
Further, when the system is not recovered to normal, the controller 30 may upload a switch-on prohibition signal to the front-end switch cabinet 200 through the corresponding passive dry contact, not allow the switch-on thereof, ensure the safety of the lower-end overhaul and maintenance process, and also avoid the occurrence of secondary damage when the fault is not eliminated.
In summary, the dc bus apparatus of the embodiment of the invention has the following advantages:
1) the device types are few, the working complexity is low, the error occurrence probability is reduced, and the MTBF (Mean Time Between Failure) index of the system is improved;
2) the direct current convergence device is used as an external interface of the energy feedback system, has good universality, better meets the product requirements and is beneficial to reducing the product development cost;
3) when the branch circuit has faults such as short circuit, long-time overload and the like, the protection of the circuit can be realized through the fuse, and when the branch circuit has short-time abnormal overload, the protection and the isolation can be performed through the contactor, so that the safety coefficient of a system is improved, and meanwhile, the replacement cost and the operation and maintenance cost of devices are also reduced;
4) the input and cut-off control of a single branch of the confluence device can be realized through the contactor, so that operation and maintenance personnel can conveniently overhaul in batches according to the power requirements of the use places;
5) When the communication is in problem, the direct current confluence device can still feed back the running state of the branch control device through the state of the passive main contact signal, and the confluence device can continue to run and control the system according to the state information of the main contact; when the internal or output side of the direct current confluence device has serious faults, the direct current confluence device has the function of a joint jump remote device; the main loop can be cut off remotely, and the influence of harm diffusion on remote equipment is avoided.
Fig. 7 is a block schematic diagram of a dc combiner cabinet according to an embodiment of the invention.
As shown in fig. 7, the dc combiner 1000 includes a cabinet 20 and the dc combiner 100 of the above embodiment, wherein the dc combiner 100 is disposed in the cabinet 20.
According to the direct current junction box provided by the embodiment of the invention, the direct current junction device only maintains the junction function of the traditional junction device, the used devices are fewer, the working complexity is low, the error probability is reduced, and when a branch circuit fails, the protection and isolation can be performed through the contactor, so that the safety coefficient of a system is improved.
Fig. 8 is a block diagram of an energy feedback system for rail transit according to an embodiment of the present invention.
As shown in fig. 8, the energy feedback system 2000 for rail transit includes a front-end switch cabinet 200, a plurality of branch line back-end devices 300, and the dc bus cabinet 1000 of the above embodiment. The dc combiner 1000 is connected to the front-end switch cabinet 200 and the plurality of branch line backend devices 300, respectively.
In one embodiment of the present invention, as shown in fig. 9, the energy feedback system 2000 of rail transit further includes a remote monitoring device 400 and an auxiliary device 500. The dc combiner 1000 is connected to the remote monitoring device 400 and the auxiliary device 500, respectively.
It should be noted that, for other embodiments of the energy feedback system 2000 for rail transit according to the embodiments of the present invention, reference may be made to the embodiment of the dc link device 100 according to the above embodiments of the present invention.
According to the energy feedback system of the rail transit, the direct current junction cabinet is adopted, the direct current junction cabinet only keeps the junction function of the traditional junction cabinet, fewer devices are used, the working complexity is low, the error occurrence probability is reduced, and when a branch fails, the protection and isolation can be performed through the contactor, and the safety coefficient of the system is improved.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (13)
1. A DC bus device, which is connected to an energy feedback system of rail transit, the DC bus device comprising:
the bus circuit comprises an input end and an output end, the bus circuit is connected with a front-end switch cabinet through the input end, the bus circuit is connected with branch rear-end equipment through the output end, the number of the output ends and the number of the branch rear-end equipment are multiple, the bus circuit further comprises a main circuit, multiple branches and multiple contactors, one end of each branch is connected to the main circuit through one contactor, the main circuit is connected with the front-end switch cabinet through the input end, and the other end of each branch is connected with one branch rear-end equipment through one output end;
A first interface arranged corresponding to the branch rear-end equipment;
the controller is connected with the branch rear-end equipment through the first interface, and is used for receiving a return detection signal sent by the branch rear-end equipment, judging whether the branch rear-end equipment fails according to the return detection signal, and controlling the confluence circuit when the branch rear-end equipment fails;
the fault detection device is respectively connected with each branch and is used for detecting whether each branch has a fault;
the controller is connected with the fault detection device and is further used for sending a stop signal to the branch rear-end equipment corresponding to the branch through the first interface corresponding to the branch rear-end equipment when the branch fails so as to stop the branch rear-end equipment and/or control the contactor corresponding to the branch to be disconnected;
the bus circuit further comprises an isolating switch connected between the main loop and the input terminal, wherein the dc bus device further comprises:
the second interface corresponds to the front-end switch cabinet;
the controller is connected with the front-end switch cabinet through the second interface, and is further configured to determine a state of the main loop according to an interlocking signal sent by the front-end switch cabinet when the controller receives the interlocking signal, and prohibit the disconnecting switch from performing switching-off and switching-on operations when the main loop is electrified.
2. The direct current bus apparatus of claim 1,
and the controller is used for controlling the contactor corresponding to the branch rear-end equipment to be disconnected when the fault of the branch rear-end equipment is judged, so that the branch corresponding to the branch rear-end equipment is disconnected with the main circuit.
3. The direct current bus apparatus as set forth in claim 1, further comprising:
the controller is connected with the remote monitoring equipment through the third interface;
the controller is further configured to send a stop signal to the plurality of branch line back-end devices through the plurality of first interfaces when the dc bus device has a serious warning, and output a joint jump signal to the remote monitoring device through the third interface, so that the remote monitoring device controls the isolating switch to cut off the dc bus device from the energy feedback system.
4. The dc link device of claim 3, wherein the dc link device is disposed in a cabinet, and a cabinet door is disposed corresponding to the cabinet, wherein the controller determines that the dc link device has a serious warning when at least one of a failure, a frame protection action, and an opening of the cabinet door occurs in all the branches.
5. The dc link device of claim 3, wherein the controller is further configured to send a switch-on enable signal to the front-end switchgear through the second interface to enable the front-end switchgear to be switched on when the energy feedback system returns to normal.
6. The direct current bus apparatus of claim 3, further comprising:
the controller is connected with auxiliary equipment through the fourth interface;
the auxiliary equipment comprises fire fighting equipment, and the controller judges that the direct current junction device gives a serious warning when receiving a fire fighting linkage signal sent by the fire fighting equipment through the fourth interface.
7. The dc bus apparatus of claim 6, wherein the first interface, the second interface, the third interface, and the fourth interface are all passive dry contact interfaces.
8. The dc bus arrangement of claim 1, wherein the branch back-end devices comprise energy storage devices and current transformers.
9. The dc bus arrangement of claim 1, wherein the bus circuit further comprises a plurality of fuses, wherein each branch circuit is connected in series with at least one fuse, and wherein the primary circuit is connected in series with at least one fuse.
10. The dc bus arrangement of claim 1, wherein the bus circuit further comprises lightning arresters connected to positive and negative terminals of the main circuit.
11. A DC combiner cabinet, comprising:
a cabinet body;
the dc bus apparatus of any of claims 1-10, wherein the dc bus apparatus is disposed within the cabinet.
12. An energy feedback system for rail transit, comprising:
a front-end switch cabinet;
a plurality of branch back-end devices;
the dc bus cabinet of claim 11.
13. The energy feedback system of rail transit of claim 12, further comprising remote monitoring equipment and auxiliary equipment.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811204216.4A CN111064177B (en) | 2018-10-16 | 2018-10-16 | Direct current conflux device, direct current conflux cabinet and energy feedback system of track traffic |
| PCT/CN2019/111484 WO2020078387A1 (en) | 2018-10-16 | 2019-10-16 | Direct current bus device, direct current bus cabinet, and energy feedback system for rail transit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811204216.4A CN111064177B (en) | 2018-10-16 | 2018-10-16 | Direct current conflux device, direct current conflux cabinet and energy feedback system of track traffic |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111064177A CN111064177A (en) | 2020-04-24 |
| CN111064177B true CN111064177B (en) | 2022-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811204216.4A Active CN111064177B (en) | 2018-10-16 | 2018-10-16 | Direct current conflux device, direct current conflux cabinet and energy feedback system of track traffic |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111064177B (en) |
| WO (1) | WO2020078387A1 (en) |
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| KR20060047091A (en) * | 2004-11-15 | 2006-05-18 | 한국철도기술연구원 | Bus differential protective relaying system in ungrounded dc traction power supply system and control method thereof |
| CN103944157A (en) * | 2014-03-27 | 2014-07-23 | 中国科学院电工研究所 | Direct current supply system for drilling machine and control method of direct current supply system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108667002B (en) * | 2017-03-30 | 2021-04-20 | 比亚迪股份有限公司 | Rail transit traction system and energy feedback system thereof |
| CN208939580U (en) * | 2018-10-16 | 2019-06-04 | 比亚迪股份有限公司 | The energy feedback system of direct current collector-shoe gear, direct current confluence cabinet and rail traffic |
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| KR20060047091A (en) * | 2004-11-15 | 2006-05-18 | 한국철도기술연구원 | Bus differential protective relaying system in ungrounded dc traction power supply system and control method thereof |
| CN103944157A (en) * | 2014-03-27 | 2014-07-23 | 中国科学院电工研究所 | Direct current supply system for drilling machine and control method of direct current supply system |
| CN107210603A (en) * | 2014-05-04 | 2017-09-26 | Abb瑞士股份有限公司 | Error protection in DC distribution systems based on converter |
| EP2957450A1 (en) * | 2014-06-19 | 2015-12-23 | Proterra Inc | Charging of a fleet of electric vehicles |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2020078387A1 (en) | 2020-04-23 |
| CN111064177A (en) | 2020-04-24 |
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