CN111884247A - Circuit structure and fault processing method and device thereof - Google Patents
Circuit structure and fault processing method and device thereof Download PDFInfo
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- CN111884247A CN111884247A CN201910763123.3A CN201910763123A CN111884247A CN 111884247 A CN111884247 A CN 111884247A CN 201910763123 A CN201910763123 A CN 201910763123A CN 111884247 A CN111884247 A CN 111884247A
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- converter
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- grid
- output power
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0038—Details of emergency protective circuit arrangements concerning the connection of the detecting means, e.g. for reducing their number
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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
- H02H7/28—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 meshed systems
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Abstract
The invention provides a circuit structure and a fault processing method and device thereof. The circuit structure comprises a plurality of branches connected in parallel, each branch comprises a converter, a bus subsection and a contactor, the converters realize grid-connected output power supply through a contactor bus, and each bus subsection and the contactor bus form an alternating current bus of the circuit structure. In response to the fact that each converter reports a short-circuit fault when the converters are connected to the power grid for output power supply, the fault processing method provided by the invention checks the specific position of the short-circuit fault in a mode of restarting the converters, sending an operation instruction to the converters and carrying out comprehensive judgment under the condition of ensuring the connected to the power grid for output power supply as far as possible, ensures that the circuit structure can continuously output power supply, reduces the influence on a rear-end load caused by short circuit, and improves the redundancy and stability of the power supply of the circuit structure.
Description
Technical Field
The invention relates to the field of fault processing, in particular to a fault processing method and device of a circuit structure with a converter parallel output power supply.
Background
The auxiliary power supply system is an important component of an urban railway vehicle, is used for controlling and providing power supply tasks of various devices except a main circuit of a traction system of the subway vehicle, and mainly provides an alternating current power supply (for example, in the subway, the alternating current power supply is 3AC380V/50Hz) for auxiliary equipment such as an air conditioner, a compressor, a fan and the like, and provides a direct current power supply (for example, in the subway, the direct current power supply is DC110V) for auxiliary direct current equipment such as a storage battery, illumination and the like.
Fig. 1 is a schematic diagram of a conventional circuit structure of a converter part of an auxiliary power supply system. As shown in fig. 1, the converter front end of the auxiliary power supply system is a dc bus, the auxiliary power supply system may include a plurality of parallel branches, each branch includes an auxiliary converter (SIV) bus subsection and a contactor (KMK), the auxiliary power supply system shown in fig. 1 includes four branches, in a normal operation situation, four contactors 310-340 in the four branches are closed simultaneously, and the converters 110-140 in the four branches operate simultaneously to provide AC380V power to an AC bus (including the bus subsection 210-the bus subsection 240 and the contactor bus 400). When any one to three converters are shut down, the AC bus can still provide AC380V power from the remaining converters.
However, when the short circuit occurs at any point in the ac bus and the converter, all the converters will be shut down due to the output overcurrent. If the short-circuit point exists all the time, output overcurrent still occurs when all the converters are restarted again, and the converters are stopped again; the final situation is that the whole alternating current bus is dead due to the existence of a short-circuit point, and the power supply system is broken down because the power cannot be supplied to the load.
In view of the above problems, there is a need for a fault handling method for a circuit structure, which can rapidly troubleshoot and isolate a fault when a short-circuit fault occurs in the auxiliary power supply system, and identify a short-circuit point to facilitate system maintenance by an engineer while ensuring that the system can supply power to the outside.
Disclosure of Invention
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
In order to solve the above problems, the present invention provides a fault handling method for a circuit structure, where the circuit structure includes multiple parallel branches, each branch includes a converter, a bus segment and a contactor, the converter is connected to a contactor bus among the multiple contactors through the corresponding bus segment and the contactor, the bus segment and the contactor bus form an ac bus of the circuit structure, and the fault handling method includes: responding to the fact that each converter reports a short-circuit fault when the converters output power supply in a grid-connected mode, keeping the plurality of contactors closed, restarting each converter, and judging whether at least one converter which finishes restarting exists in the plurality of converters; responding to the existence of at least one converter which finishes restarting, and sequentially sending a grid-connected operation instruction to the at least one converter which finishes restarting until the converter which currently receives the grid-connected operation instruction finishes grid-connected output power supply; and responding to the existence of the converter which completes grid-connected output power supply, eliminating the short-circuit fault positioned on the alternating current bus, and at least maintaining the grid-connected operation of the converter which completes grid-connected output power supply.
In an embodiment of the foregoing fault handling method, optionally, the fault handling method further includes: in response to the existence of the converter completing grid-connected output power supply, further judging whether the rest converters in at least one converter completing restart complete automatic grid-connected output power supply after the converter completing grid-connected output power supply is in grid-connected operation; and responding to the converter which completes automatic grid-connected output power supply, eliminating the short-circuit fault inside the converter which completes automatic grid-connected output power supply, and maintaining the grid-connected operation of the converter which completes automatic grid-connected output power supply.
In an embodiment of the fault handling method, optionally, in response to the presence of a converter with an incomplete automatic grid-connected output power supply, the short-circuit fault is located inside the converter with the incomplete automatic grid-connected output power supply.
In an embodiment of the fault handling method, optionally, in response to that none of the converters receiving the grid-connected operation instruction can complete grid-connected output power supply, the short-circuit fault is located at least on the ac bus.
In an embodiment of the fault handling method, optionally, in response to that none of the converters receiving the grid-connected operation instruction can complete grid-connected output power supply, the fault handling method further includes: and disconnecting each contactor, sending an independent operation instruction to each converter, judging whether each converter completes independent output power supply or not, responding to the fact that each converter completes independent output power supply, keeping each converter independently output power supply, and positioning the short-circuit fault on the bus of the contactor.
In an embodiment of the fault handling method, optionally, in response to the presence of a converter with an incomplete independent output power supply, the short-circuit fault is located in a branch where at least the converter with the incomplete independent output power supply is located.
In an embodiment of the fault handling method, optionally, in response to the presence of a converter that partially completes independent output power supply, the fault handling method further includes: closing the contactors corresponding to the converters completing the independent output power supply, sending a grid-connected operation instruction to any converter completing the independent output power supply, and judging whether the converter completing the independent output power supply receiving the grid-connected operation instruction completes the grid-connected output power supply or not; and responding to the converter which completes independent output power supply and receives the grid-connected operation instruction to complete grid-connected output power supply, eliminating the short-circuit fault and locating the short-circuit fault at the contactor bus, and automatically performing grid-connected output power supply on the converter which completes independent output power supply.
In an embodiment of the fault handling method, optionally, in response to that the converter that completes independent output power supply and receives the grid-connected operation instruction does not complete grid-connected output power supply, the short-circuit fault is located on the contactor bus; and disconnecting all the contactors, and sending an independent operation instruction to the converter which completes independent output power supply to the part so as to enable the part to complete independent output power supply of the converter which independently outputs power supply to the part.
In an embodiment of the fault handling method, optionally, in response to the existence of the converter which is not restarted, the short-circuit fault is located at least inside the converter which is not restarted.
The invention also provides a fault processing device of a circuit structure, the circuit structure comprises a plurality of branches connected in parallel, each branch comprises a current transformer, a bus subsection and a contactor, the current transformer is connected to a contactor bus among the plurality of contactors through the corresponding bus subsection and the contactor to realize grid-connected output power supply, each bus subsection and the contactor bus form an alternating current bus of the circuit structure, the fault processing device comprises a memory and a processor, and the processor is configured to: responding to the fact that each converter reports a short-circuit fault when the converters output power supply in a grid-connected mode, keeping the plurality of contactors closed, restarting each converter, and judging whether at least one converter which finishes restarting exists in the plurality of converters; responding to the existence of at least one converter which finishes restarting, and sequentially sending a grid-connected operation instruction to the at least one converter which finishes restarting until the converter which currently receives the grid-connected operation instruction finishes grid-connected output power supply; and responding to the existence of the converter which completes grid-connected output power supply, eliminating the short-circuit fault positioned on the alternating current bus, and at least maintaining the grid-connected operation of the converter which completes grid-connected output power supply.
In an embodiment of the fault handling apparatus, optionally, the processor is further configured to: in response to the existence of the converter completing grid-connected output power supply, further judging whether the rest converters in at least one converter completing restart complete automatic grid-connected output power supply after the converter completing grid-connected output power supply is in grid-connected operation; and responding to the converter which completes automatic grid-connected output power supply, eliminating the short-circuit fault inside the converter which completes automatic grid-connected output power supply, and maintaining the grid-connected operation of the converter which completes automatic grid-connected output power supply.
In an embodiment of the fault handling apparatus, optionally, in response to the presence of a converter with an incomplete automatic grid-connected output power supply, the short-circuit fault is located inside the converter with the incomplete automatic grid-connected output power supply.
In an embodiment of the fault handling apparatus, optionally, in response to that none of the converters receiving the grid-connected operation instruction can complete grid-connected output power supply, the short-circuit fault is located at least on the ac bus.
In an embodiment of the fault handling apparatus, optionally, in response to that none of the converters receiving the grid-connected operation instruction can complete grid-connected output power supply, the processor is further configured to: and disconnecting each contactor, sending an independent operation instruction to each converter, judging whether each converter completes independent output power supply or not, responding to the fact that each converter completes independent output power supply, keeping each converter independently output power supply, and positioning the short-circuit fault on the bus of the contactor.
In an embodiment of the fault handling apparatus, optionally, in response to the presence of a converter with an incomplete independent output power supply, the short-circuit fault is located in at least a branch where the converter with the incomplete independent output power supply is located.
In an embodiment of the fault handling apparatus, optionally, in response to the presence of a converter that partially completes independent output power supply, the processor is further configured to: closing the contactors corresponding to the converters completing the independent output power supply, sending a grid-connected operation instruction to any converter completing the independent output power supply, and judging whether the converter completing the independent output power supply receiving the grid-connected operation instruction completes the grid-connected output power supply or not; and responding to the converter which completes independent output power supply and receives the grid-connected operation instruction to complete grid-connected output power supply, eliminating the short-circuit fault and locating the short-circuit fault at the contactor bus, and automatically performing grid-connected output power supply on the converter which completes independent output power supply.
In an embodiment of the fault handling apparatus, optionally, in response to that the converter that completes independent output power supply and receives the grid-connected operation instruction does not complete grid-connected output power supply, the short-circuit fault is located on the contactor bus; and disconnecting all the contactors, and sending an independent operation instruction to the converter which completes independent output power supply to the part so as to enable the part to complete independent output power supply of the converter which independently outputs power supply to the part.
In an embodiment of the fault handling apparatus, optionally, in response to the presence of an unfinished converter, the short-circuit fault is located at least inside the unfinished converter.
The invention also provides a circuit structure, which comprises a plurality of branches connected in parallel, wherein each branch comprises a converter, a bus subsection and a contactor, the converter realizes grid-connected output power supply through the corresponding bus subsection and a contactor bus connected among the contactors in response to the closing of the contactor, and each bus subsection and the contactor bus form an alternating current bus of the circuit structure, wherein the circuit structure further comprises a fault processing device as above.
The invention also provides a computer storage medium having a computer program stored thereon, which, when executed by a processor, performs the steps of the fault handling method as described in any one of the above.
According to the circuit structure and the fault processing method and device thereof provided by the invention, when the circuit structure has a short-circuit fault, the fault can be rapidly checked and isolated, and under the condition that the system can supply power outwards as much as possible, a short-circuit point is identified, so that engineering personnel can maintain the system, meanwhile, the influence on a rear-end load caused by short circuit is reduced, and the redundancy and stability of power supply of the circuit structure are improved.
Drawings
The above features and advantages of the present disclosure will be better understood upon reading the detailed description of embodiments of the disclosure in conjunction with the following drawings. In the drawings, components are not necessarily drawn to scale, and components having similar relative characteristics or features may have the same or similar reference numerals.
Fig. 1 shows a circuit structure for positioning a short-circuit fault by applying the fault processing method provided by the invention.
Fig. 2 shows a flow chart of a fault handling method provided by the present invention.
Fig. 3 shows a schematic diagram of a fault handling device provided by the present invention.
Fig. 4 shows a schematic diagram of a circuit configuration provided by the present invention.
Reference numerals
110-140 current transformer
210-240 bus bar subsections
310-340 contactor
400 contactor bus
300 failure handling device
301 processor
302 memory
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. It is noted that the aspects described below in connection with the figures and the specific embodiments are only exemplary and should not be construed as imposing any limitation on the scope of the present invention.
As described above, when all the converters report short-circuit faults simultaneously in the circuit structure shown in fig. 1, the fault processing method provided by the present invention is adopted to enable the circuit structure to output power to the outside and to accurately locate the short-circuit point, so that the engineer can perform subsequent maintenance.
Referring to fig. 2, in step S1000, firstly, all the converters SIV report the short-circuit fault at the same time. The short-circuit fault reporting can be realized by monitoring whether the output of the converter is over-current or not in a mode of arranging a current sensor, so that the shutdown is caused. In particular, the current sensor can be arranged by existing or future means, and is not limited herein, and in a preferred embodiment, the current sensor is arranged inside each converter SIV, so that not only can whether each converter is overcurrent be monitored, but also which SIV is reported in error can be clearly known.
In response to that all SIVs report the short-circuit fault at the same time in step S1000, step S1100 is executed to restart all SIVs, and no instruction for supplying power to the outside is sent to the SIVs, so that only the SIVs themselves are restarted.
If the SIV reports the short-circuit fault again at the moment, namely the restart cannot be completed, the fact that the short-circuit point exists inside the SIV reporting the short-circuit fault is roughly stated, and the short-circuit point can be preliminarily positioned and located inside the SIV reporting the short-circuit fault again. Although the short-circuit point may be located inside the SIV, it is not excluded that the ac busbar is not present, and therefore further operation is required.
If the SIV does not report the short-circuit fault again at this time, that is, all the SIVs are restarted, it is probably indicated that there is no fault inside the SIV, but it still cannot be determined that the short-circuit point is necessarily located on the ac bus, and therefore, further operation is also required.
In step S2000, it is determined whether there is a signal indicating that the SIV completes the restart, and if all the SIVs do not send a signal indicating that the system has an extremely serious fault, the hardware cannot ensure the output power supply. In response to the presence of the signal that the SIV completes the restart, it means that at least one converter capable of outputting power is present, and therefore, step S2100 is executed to sequentially send a grid-connected operation command to each SIV that completes the restart.
In the normal operation, as in the circuit configuration shown in fig. 1, all the contactors 310 to 340 are kept closed to enable the converter to output power supply by grid connection, so that all the contactors 310 to 340 are always kept closed in the process from step S1000 to step S2100. In step S2100, a grid-connected operation instruction is sequentially sent to each SIV that has completed restarting one by one, and the grid-connected operation instruction may be set according to an actual control instruction, for example, a 3S high electrical pulse signal may be sent, so that the converter may output outward, and since the contactors 310 to 340 are all kept closed, parallel grid-connected output power supply may be implemented when there is no fault in the ac bus.
In step S3000, it is further determined whether the SIV currently receiving the grid-connected operation instruction completes grid-connected output power supply.
If the SIV receiving the grid-connected operation instruction completes grid-connected output power supply, it can be determined in step S3100 that the elimination short-circuit point is located on the bus, that is, there is no short-circuit fault point in the ac bus, and the converter can implement grid-connected output power supply through the ac bus. In the above embodiments, whether the SIV completes supplying power to the output can also be achieved by monitoring the current through the current sensor, and the arrangement of the current sensor is not a limitation to the method of the present invention. Further, whether the SIV outputs outwards can also be judged by monitoring whether an output contactor inside the SIV is closed. One skilled in the art should appreciate that the SIV may be determined by other methods to complete the grid-connected output power supply, and is not limited.
Although the possibility that the short-circuit point is located on the alternating-current bus is eliminated, whether short-circuit electricity exists in the SIV can be preliminarily judged by restarting the SIV, and whether the short-circuit fault point exists in the SIV can be further verified by judging whether the rest SIVs complete automatic grid connection output.
Therefore, step S3110 is performed: and judging whether the rest SIVs complete automatic grid-connected output or not. The automatic grid-connected output means that the SIV locks the phase and adjusts the phase to be consistent with the alternating current bus after detecting that the alternating current bus has the AC380V, and then closes the output contactor to complete the grid-connected output process.
In response to all SIVs having completed the automatic grid-connection output, step S3111 is illustrated: excluding the short-circuit point being located inside the SIV, it can therefore be assumed that the short-circuit point may be present in the load segment or that a short-circuit false alarm is due to an external circuit instability. And because all SIVs complete the automatic grid-connected output, step S4000 is executed to maintain the power supply of all SIVs at the grid-connected output. By the fault processing method provided by the invention, the circuit structure shown in fig. 1 can be connected to the grid again to output power supply, the influence on external loads is small, no short-circuit point exists in the SIV and the alternating-current bus, and the short-circuit point is eliminated.
In response to the presence of SIV without completing the automatic grid-connection output, step S3112 is illustrated: and the positioning short-circuit point is positioned inside the SIV which does not finish automatic grid connection output. And since there is already an SIV capable of completing the grid-connected output, step S4000 may be performed so that all the SIVs having completed the automatic grid-connected output maintain the grid-connected output power supply. Because the output contactor of the SIV exists inside the SIV and the automatic grid-connected output is a reverse process, namely the process of locking the phase and closing the output contactor of the SIV under the condition of sensing the alternating current of the bus, although a short-circuit point exists inside a certain SIV, the short-circuit point is isolated by the output contactor of the SIV inside the SIV where the short-circuit point is located by the fault processing method provided by the invention, so that the SIV without the internal short-circuit point in the circuit structure shown in figure 1 can be subjected to grid-connected output power supply again, the influence on an external load is small, the short-circuit point in the SIV which cannot complete the automatic grid-connected output is confirmed, and meanwhile, the short-circuit point is isolated, so that subsequent maintenance of engineering personnel is facilitated.
If the SIV currently receiving the grid-connected operation instruction does not complete the grid-connected output power supply in step S3000, and the short circuit is not located in the ac bus as much as possible, it is further necessary to continue sending the grid-connected output instruction to each SIV that completes the restart, and step S2100 and step S3000 are repeated until all SIVs that complete the restart cannot complete the grid-connected output power supply, then step S3200, where the short circuit point is located at least in the ac bus segment.
Since the ac bus section includes ac bus subsection 210-240 on each branch, and contactor bus 400 between multiple contactors, it is desirable to further narrow the short-circuit fault point, and therefore, further perform step S3300: disconnecting all the contactors; independent run instructions are sent to all SIVs. Because the independent operation instruction is sent, all contactors are switched off, and even if a single SIV branch circuit is short-circuited, the influence on other SIV branch circuits is avoided. The independent operation instruction can be set according to an actual control instruction, and the independent operation instruction is not limited in the invention as long as the SIV can supply power to the external output.
Because the SIV of each branch circuit operates independently, the alternating current bus can be effectively divided into each bus subsection and the contactor bus subsection, and the position of a short-circuit point can be determined by judging the independent operation state of the SIV.
Specifically, in step S3400, if it is determined that all SIVs can complete independent output power supply, it indicates that no short-circuit point exists inside all the SIVs, and no short-circuit point exists in all the bus subsections on the SIV branches, then step S3440, the short-circuit point is located on the contactor bus 400. Meanwhile, since the contactor bus 400 has a short-circuit fault, the SIV in the whole circuit structure has no way to implement grid-connected output power supply, and therefore, in this case, step S5000 is executed to maintain independent output power supply of all SIVs. Although grid-connected output power supply cannot be realized on hardware due to short circuit of a bus of the contactor, the fault processing method provided by the invention can ensure that the whole circuit structure can output power supply to the outside as much as possible, and reduces the influence on a subsequent load end. Meanwhile, the short-circuit point is confirmed to be positioned in the contactor bus section, so that subsequent maintenance of engineering personnel is facilitated.
In another embodiment, if it is determined in step S3400 that there is an SIV that has not completed independent output power supply, step S3410 may determine that there is a short-circuit point in the branch where the SIV that has failed to complete independent output power supply exists. In cooperation with step S2000, when the SIV of the branch can be restarted, the short-circuit point can be further reduced to the bus subsection of the branch. Or, in the case that only one branch does not complete independent output power supply exists, the short-circuit point is further reduced to the bus subsection of the branch. Under the condition, the short-circuit point can be particularly arranged on a certain branch, so that the subsequent maintenance of engineering personnel is facilitated.
In step S3410, it can be determined that the short-circuit point is located on one of the paths of the circuit structure, but it cannot be guaranteed that the short-circuit point does not exist on the contactor bus. And because the grid-connected output power supply can make the power supply more stable, the influence on the load end is minimum, if there is not a short-circuit point on the contactor bus, it is hoped that SIV can be grid-connected output power supply as far as possible.
Therefore, in the above embodiment, the method further includes executing step S3420, namely, undoing the independent operation instruction; closing all contactors of the branch where the SIV which finishes independent output power supply is located (so that the contactors of the branch where the SIV which does not finish independent output power supply is located are opened); and sending a grid-connected operation instruction to any SIV which completes independent output power supply. And then executing step S3430, judging whether the SIV receiving the grid-connected operation instruction completes grid-connected output power supply, if the grid-connected output power supply can be completed, then step S3431, excluding the short-circuit point from being located on the contactor bus, and executing step S4000 to maintain the grid-connected output power supply because the short-circuit point does not exist in the branch closed by each contactor after verification. By the fault processing method provided by the invention, the short-circuit point can be positioned on a specific branch circuit under the condition that the short-circuit point exists at the bus subsection, and the short-circuit point is isolated by disconnecting the contactor of the branch circuit, so that SIVs on other branch circuits in the circuit structure shown in figure 1 can be connected to the grid again to output power supply, the influence on an external load is small, and the short-circuit point is confirmed to be positioned on a specific branch circuit, thereby facilitating the subsequent maintenance of engineering personnel.
If in step S3430, it is found that the SIV receiving the grid-connected operation command completes the grid-connected output power supply according to the rule, and since the SIV can independently output the power supply, step S3432 further positions the short-circuit point to be also located on the contactor bus. Because the short-circuit point is also positioned on the bus of the contactor, the whole circuit structure cannot realize grid-connected output power supply from hardware, so that the step S3433 is executed, the grid-connected operation instruction is cancelled, all contactors are disconnected, and an independent operation instruction is sent to all SIVs completing independent output power supply, so that the step S5000 is executed, and the independent output power supply of the SIV is maintained. Although grid-connected output power supply cannot be realized on hardware due to short circuit of a bus of the contactor, the fault processing method provided by the invention can ensure that the whole circuit structure can output power supply to the outside as much as possible, and reduces the influence on a subsequent load end. Meanwhile, the short-circuit point is confirmed to be not only located on a specific branch circuit, but also located in a contactor bus section, so that subsequent maintenance of engineering personnel is facilitated.
The fault processing method provided by the invention has been described so far, and the fault processing method provided by the invention does not need to add a new device, carries out comprehensive judgment through the converter and the control network, can rapidly troubleshoot and isolate faults when the circuit structure has short-circuit faults, identifies short-circuit points under the condition of ensuring that the system can supply power outwards as much as possible, so that engineering personnel can maintain the system, simultaneously reduces the influence on a rear-end load caused by short circuit, and improves the redundancy and stability of the power supply of the circuit structure.
The invention also provides a fault handling device, please refer to fig. 3, and fig. 3 shows a schematic diagram of the fault handling device. As shown in fig. 3, the fault handling apparatus 300 includes a processor 301 and a memory 302. The processor 301 of the fault handling apparatus 300 can implement the fault handling method described above when executing the computer program stored in the memory 302, and please refer to the description of the fault handling method, which is not described herein again. In a preferred embodiment, since the auxiliary power supply system already has a controller to control and monitor the operation of each SIV, the fault handling means can be compatibly implemented by the controller.
The invention further provides a circuit structure, please refer to fig. 4, and fig. 4 shows a schematic diagram of the circuit structure. As shown in fig. 4, the circuit configuration includes a circuit configuration in which the converters of the auxiliary power supply system are connected in parallel as shown in fig. 1 and a fault handling apparatus as shown in fig. 3. It is understood that although the circuit structure shown in fig. 4 includes four converter branches, those skilled in the art may provide other numbers of converter branches according to actual requirements, and the invention is also included in the present invention.
According to the circuit structure provided by the invention, even if short-circuit faults exist, the fault processing device can output power supply as much as possible by implementing the fault processing method provided by the invention, grid-connected output power supply as much as possible is realized, the influence on a rear-end load is small, and the power supply redundancy and the stability of the circuit structure are greatly improved.
The circuit structure and the fault processing method and device thereof provided by the invention have been described so far. The invention also provides a computer storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of the fault handling method as described above.
Those of skill in the art would understand that information, signals, and data may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits (bits), symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. 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 invention.
In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted" and "coupled" are to be construed broadly, e.g., as meaning fixedly attached, detachably attached, or integrally attached; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The various illustrative logical modules, and circuits described in connection with the embodiments disclosed herein may be implemented or performed with a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
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 RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In the alternative, the processor and the storage medium may reside as discrete components in a user terminal.
In one or more exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software as a computer program product, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a web site, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk (disk) and disc (disc), as used herein, includes Compact Disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk and blu-ray disc where disks (disks) usually reproduce data magnetically, while discs (discs) reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.
The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (20)
1. A fault processing method of a circuit structure comprises a plurality of branch circuits connected in parallel, each branch circuit comprises a current transformer, a bus subsection and a contactor, the current transformers are connected to contactor buses among the contactors through the corresponding bus subsections and the contactors to achieve grid-connected output power supply, each bus subsection and the contactor buses form an alternating current bus of the circuit structure, and the fault processing method comprises the following steps:
responding to the fact that each converter reports a short-circuit fault when the converters are in grid-connected output power supply, keeping the plurality of contactors closed, restarting each converter, and judging whether at least one converter which finishes restarting exists in the plurality of converters;
responding to the existence of at least one converter which finishes restarting, and sequentially sending a grid-connected operation instruction to the at least one converter which finishes restarting until the converter which currently receives the grid-connected operation instruction finishes grid-connected output power supply; and
and responding to the existence of the converter which completes grid-connected output power supply, eliminating the short-circuit fault positioned in the alternating current bus, and at least maintaining the grid-connected operation of the converter which completes grid-connected output power supply.
2. The fault handling method of claim 1, wherein the fault handling method further comprises: in response to the existence of the converter completing grid-connected output power supply, further judging whether the rest converters in at least one converter completing restart complete automatic grid-connected output power supply after the converter completing grid-connected output power supply is in grid-connected operation; and
and responding to the existence of the converter which completes automatic grid-connected output power supply, eliminating the short-circuit fault inside the converter which completes automatic grid-connected output power supply, and maintaining the grid-connected operation of the converter which completes automatic grid-connected output power supply.
3. The fault handling method of claim 2, wherein the short circuit fault is located inside an unfinished automatic grid-connected output powered converter in response to the presence of the unfinished automatic grid-connected output powered converter.
4. The fault handling method of claim 1, wherein the short circuit fault is located at least on the ac bus in response to each converter receiving a grid-connected operation command failing to complete grid-connected output power supply.
5. The fault handling method of claim 4, wherein in response to each converter receiving a grid-connected operation command failing to complete grid-connected output power supply, the fault handling method further comprises:
disconnecting each contactor, sending independent operation instructions to each converter, and judging whether each converter completes independent output power supply, an
And responding to the fact that each converter completes independent output power supply, keeping each converter independently outputting power supply, and positioning the short-circuit fault to be located on the contactor bus.
6. The fault handling method of claim 5, wherein in response to the presence of an unfinished independently output powered converter, locating the short circuit fault in at least a leg of the unfinished independently output powered converter.
7. The fault handling method of claim 6, wherein in response to the presence of a converter that partially completes independent output powering, the fault handling method further comprises:
closing the contactors corresponding to the converters which partially complete independent output power supply, sending a grid-connected operation instruction to any converter which completes independent output power supply, and judging whether the converter which completes independent output power supply and receives the grid-connected operation instruction completes grid-connected output power supply or not; and
and responding to the converter which completes independent output power supply and receives the grid-connected operation instruction to complete grid-connected output power supply, eliminating the short-circuit fault positioned on the contactor bus, and automatically performing grid-connected output power supply on the part of the converter which completes independent output power supply.
8. The fault handling method of claim 7, wherein in response to a converter that has completed independent output power supply receiving a grid-connected operation command not completing grid-connected output power supply, locating the short circuit fault as still located on the contactor bus; and
and disconnecting all the contactors, and sending an independent operation instruction to the converter which partially completes independent output power supply so as to enable the converter which partially completes independent output power supply to independently output power supply.
9. The fault handling method according to any of claims 1 to 8, wherein in response to the presence of an unfinished restarted converter, locating the short circuit fault is located at least inside the unfinished restarted converter.
10. A fault handling device for a circuit structure, the circuit structure comprising a plurality of branches connected in parallel, each branch comprising a converter, a bus subsection and a contactor, the converter implementing grid-tied output power supply by connecting the converter to a contactor bus between the plurality of contactors via the corresponding bus subsection and contactor, each bus subsection and the contactor bus constituting an ac bus of the circuit structure, the fault handling device comprising a memory and a processor, the processor configured to:
responding to the fact that each converter reports a short-circuit fault when the converters are in grid-connected output power supply, keeping the plurality of contactors closed, restarting each converter, and judging whether at least one converter which finishes restarting exists in the plurality of converters;
responding to the existence of at least one converter which finishes restarting, and sequentially sending a grid-connected operation instruction to the at least one converter which finishes restarting until the converter which currently receives the grid-connected operation instruction finishes grid-connected output power supply; and
and responding to the existence of the converter which completes grid-connected output power supply, eliminating the short-circuit fault positioned in the alternating current bus, and at least maintaining the grid-connected operation of the converter which completes grid-connected output power supply.
11. The fault handling device of claim 10, wherein the processor is further configured to: in response to the existence of the converter completing grid-connected output power supply, further judging whether the rest converters in at least one converter completing restart complete automatic grid-connected output power supply after the converter completing grid-connected output power supply is in grid-connected operation; and
and responding to the existence of the converter which completes automatic grid-connected output power supply, eliminating the short-circuit fault inside the converter which completes automatic grid-connected output power supply, and maintaining the grid-connected operation of the converter which completes automatic grid-connected output power supply.
12. The fault handling device of claim 11, wherein the short circuit fault is located internal to an unfinished automatic grid-connected output powered converter in response to the presence of the unfinished automatic grid-connected output powered converter.
13. The fault handling device of claim 10, wherein the short circuit fault is located at least on the ac bus in response to each converter receiving a grid-tie operation command failing to complete a grid-tie output power supply.
14. The fault handling device of claim 13, wherein in response to each converter receiving a grid-tie operation command failing to complete a grid-tie output power supply, the processor is further configured to:
disconnecting each contactor, sending independent operation instructions to each converter, and judging whether each converter completes independent output power supply, an
And responding to the fact that each converter completes independent output power supply, keeping each converter independently outputting power supply, and positioning the short-circuit fault to be located on the contactor bus.
15. The fault handling device of claim 14, wherein in response to the presence of an unfinished independently output powered converter, locating the short circuit fault in at least a leg of the unfinished independently output powered converter.
16. The fault handling device of claim 15, wherein in response to the presence of a current transformer that partially completes independent output powering, the processor is further configured to:
closing the contactors corresponding to the converters which partially complete independent output power supply, sending a grid-connected operation instruction to any converter which completes independent output power supply, and judging whether the converter which completes independent output power supply and receives the grid-connected operation instruction completes grid-connected output power supply or not; and
and responding to the converter which completes independent output power supply and receives the grid-connected operation instruction to complete grid-connected output power supply, eliminating the short-circuit fault positioned on the contactor bus, and automatically performing grid-connected output power supply on the part of the converter which completes independent output power supply.
17. The fault handling device of claim 16, wherein in response to a converter receiving a grid-connected operation command that completes independent output power supply not completing grid-connected output power supply, locating the short circuit fault also at the contactor bus; and
and disconnecting all the contactors, and sending an independent operation instruction to the converter which partially completes independent output power supply so as to enable the converter which partially completes independent output power supply to independently output power supply.
18. The fault handling device according to any of claims 10-17, wherein in response to the presence of an unfinished restarted converter, locating the short circuit fault is located at least inside the unfinished restarted converter.
19. A circuit arrangement comprising a plurality of branches connected in parallel, each branch comprising a converter, a bus-bar subsection and a contactor, the converter providing a grid-tied output supply via the corresponding bus-bar subsection and a contactor bus connected between the plurality of contactors in response to the contactors being closed, each bus-bar subsection and the contactor bus constituting an ac bus of the circuit arrangement, characterised in that it further comprises a fault handling device according to any one of claims 10-18.
20. A computer storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the fault handling method according to any one of claims 1-9.
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