CN112383033A - System and method suitable for local rapid spare power automatic switching of power distribution network ring network line - Google Patents
System and method suitable for local rapid spare power automatic switching of power distribution network ring network line Download PDFInfo
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- CN112383033A CN112383033A CN202011077460.6A CN202011077460A CN112383033A CN 112383033 A CN112383033 A CN 112383033A CN 202011077460 A CN202011077460 A CN 202011077460A CN 112383033 A CN112383033 A CN 112383033A
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- ring network
- automatic switching
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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
- H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
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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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Small-Scale Networks (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention provides a system and a method suitable for on-site rapid spare power automatic switching of a ring network line of a power distribution network. After the segmented spare power automatic switching device receives a starting spare switching signal sent by a fault protection device of the ring network unit, the fact that a fault bus has no power supply voltage is confirmed, the fault is isolated, the power supply voltage of the bus to be switched is normal, and after the spare switching device is charged, the action of a switching breaker of the ring network unit is controlled after a set time period is delayed, and the bus switching power supply is completed. According to the method for on-site rapid spare power automatic switching, the fault protection device is used for transmitting the action signal to the next-stage sectional spare power automatic switching, the switching-on time of the spare power automatic switching of each ring network unit does not need to consider the matching of the level difference, and rapid switching is achieved. The power supply system is suitable for power supply conversion of a multi-level distribution network or a subway large-partition ring network power supply line.
Description
Technical Field
The invention relates to the technical field of power distribution networks, in particular to a system and a method for on-site rapid spare power automatic switching of a ring network line of a power distribution network.
Background
A core area with high requirement on power supply reliability of a domestic power distribution network introduces 2 paths of power supplies from a transformer substation by adopting a 3-5 segmented double-ring network power supply mode, the field of urban rail transit is particularly prominent, a large number of large-partition power supplies are used in a subway power supply system at present, a looped network unit/a switch station/a subway traction substation are single-bus segmented wiring, and a segmented spare power automatic switching mode is adopted.
If the backup power automatic switching adopts the traditional low-voltage starting logic, according to the requirement of DL/T584 'operation setting regulation of 3 kV-110 kV power grid relay protection device', the low-voltage action time of the backup power automatic switching is longer than the backup protection action time of the power side of the line at the current stage, and in addition, in order to avoid large-area actions of the backup power automatic switching caused by single fault, the low-voltage action time of the backup power automatic switching is matched step by step according to the principle of from top to bottom.
The existing backup power automatic switching starting logic has complex judgment principle, especially the time sequence logic judgment between conditions is complex, and the time delay is long. How to provide a backup power automatic switching method with simple logic and short time delay is a technical problem to be solved urgently in the field.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a local rapid spare power automatic switching system and a method suitable for a ring network line of a power distribution network.
In order to achieve the aim, the invention provides a method for on-site rapid spare power automatic switching of a ring network line of a power distribution network, when a ring network cable fails, a fault protection device of a ring network unit trips a breaker at a protection installation position to carry out fault isolation, and sends a starting standby switching signal to a next-stage subsection spare power automatic switching device at a fault point;
when a bus of a ring network unit fails, an incoming line fault protection device of the fault bus trips an incoming line breaker of the fault bus in parallel to perform fault isolation with an outgoing line breaker of the bus, and simultaneously trips an incoming line breaker of a next ring network unit, wherein the incoming line breaker of the next ring network unit sends a standby switching starting signal to a current-stage sectional spare automatic switching device;
after the sectional spare power automatic switching device receives the starting spare switching signal, the incoming line is confirmed to be tripped open, the bus does not have power supply voltage, the power supply voltage of the bus to be switched is normal, and the standby switching device is charged completely, then the switching-on action of the sectional circuit breaker of the ring network unit is controlled after a set time period is delayed, and the bus in the ring network unit is switched to supply power.
Further, the fault protection device includes a differential protection function or a dynamic adaptive protection function.
Further, the action of controlling the on-off section breaker of the ring network unit specifically comprises: and starting the spare power automatic switching signal to be transmitted to the sectional spare power automatic switching device of the ring network unit in a hard switching-in or GOOSE mode, and controlling the sectional breaker to be switched on through the judgment of the spare power automatic switching on and switching off.
Furthermore, the fault bus is isolated, namely, the breaker where the bus fault protection device is located is tripped, the same bus outgoing breaker and the next-stage ring network unit incoming breaker are tripped in a combined mode, and the incoming protection device of the next-stage ring network unit simultaneously sends a starting backup power automatic switching signal to the current-stage ring network unit sectional protection backup power automatic switching device.
The invention provides a system suitable for on-site fast spare power automatic switching of a ring network line of a power distribution network, which comprises a fault protection device and a sectional spare power automatic switching device;
when the looped network cable fails, the fault protection device of the looped network unit trips to protect a breaker at an installation position for fault isolation, and sends a starting standby switching signal to a next-stage sectional standby automatic switching device at a fault point;
when a bus of a ring network unit fails, an incoming line fault protection device of the fault bus trips an incoming line breaker of the fault bus in parallel to perform fault isolation with an outgoing line breaker of the bus, and simultaneously trips an incoming line breaker of a next ring network unit, wherein the incoming line breaker of the next ring network unit sends a standby switching starting signal to a current-stage sectional spare automatic switching device;
after the sectional spare power automatic switching device receives the starting spare switching signal, the incoming line is confirmed to be tripped open, the fault bus has no power supply voltage, the power supply voltage of the bus to be switched is normal, and the standby switching device is charged completely, and then the combined sectional circuit breaker of the ring network unit is controlled to act after a time delay setting time period, so that power supply conversion of the bus is completed.
Further, the fault protection device includes a differential protection device protection function or a dynamic adaptive protection function.
Further, the action of controlling the on-off section breaker of the ring network unit specifically comprises: and a starting spare power automatic switching signal is transmitted to the sectional spare power automatic switching device of the ring network unit in a hard switching-in or GOOSE mode, and the sectional breaker is controlled to be switched on through spare power automatic switching-on and switching-off judgment.
Furthermore, the fault bus is isolated, namely, the breaker where the bus fault protection device is located is tripped, the same bus outgoing breaker and the next-stage ring network unit incoming breaker are tripped in a combined mode, and the incoming protection device of the next-stage ring network unit simultaneously sends a starting backup power automatic switching signal to the current-stage ring network unit sectional protection backup power automatic switching device.
The technical scheme of the invention has the following beneficial technical effects:
(1) according to the method for on-site rapid spare power automatic switching, the fault protection device is used for transmitting the action signal to the local sectional spare power automatic switching, and the switching-on time of the spare power automatic switching of each ring network unit does not need to consider the matching of the level difference, so that rapid switching is realized. The power supply system is suitable for power supply conversion of a multi-level distribution network or a subway large-partition ring network power supply line.
(2) The method for the local quick spare power automatic switching does not need to consider the fault clearing time and the closing time, so the delay time is shorter.
Drawings
FIG. 1 is a schematic diagram of a dual ring network power supply;
FIG. 2 is a logic diagram of the on-site fast spare power automatic switching device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
As shown in fig. 1, a schematic diagram of a dual-ring network power supply mode is shown. When the looped network cable has a fault, the next stage of incoming line trip signal starts the fast spare power automatic switching device, and selective power distribution network protection such as differential protection and dynamic self-adaptive protection T1 section action signals configured on the incoming line are transmitted to the local subsection spare power automatic switching device in a hard switching-in or GOOSE mode.
Taking the ring network unit 2 as an example, after the local spare power automatic switching charging is completed, when the bus line 1I starts the standby power switching operation, the three-line voltage of the bus line I is judged to be zero and any line of the bus line II has the voltage, and after the circuit breaker of the bus line 1I is confirmed to be tripped, the circuit breaker is switched on and off through 'segmented switching-on delay'; when the bus line II 1 is started to be switched in, the three lines of the bus II are not pressurized, any line of the bus I is pressurized, and after the circuit breaker II is determined to be tripped, the circuit breaker II is switched on and switched off through 'segmented switching-on delay'.
The spare power automatic switching closing time of each ring network unit does not need to consider the matching of the level difference, and the method is suitable for switching power supply of a multi-level distribution network or a subway large-partition ring network power supply line.
And the local spare power automatic switching function is configured at the bus-bar joint of each ring network unit, and the local bus-bar joint spare power automatic switching is started by the last cascade jump incoming line.
(1) Looped network cable fault
The fault occurs at the point A between the circuit breakers 4 and 5, the fault location is realized by the dynamic adaptive protection arranged at the position 4 to trip off the circuit breaker 4, the circuit breaker 5 is connected in parallel to complete fault isolation, the ring network unit 3 is started to be in-place spare power automatic switching, the circuit breaker 5 is tripped, the left bus is in voltage loss, the right bus is in voltage, and the power supply switching of the left bus of the ring network unit 3 is completed.
(2) Bus fault
The fault occurs at a D point of a bus 2 of the ring network station, the fault location is protected by a dynamic adaptation configured at the 3 position to complete the trip breaker 3, the trip breaker 4 is connected in parallel with the trip breaker 5 to complete fault isolation, the ring network unit 3 is started to be in-place automatic switching, the fact that the breaker 5 is tripped, the bus on the left side is in voltage loss, the bus on the right side is in voltage pressure is confirmed, and the fact that the bus on the left side of the ring network unit 3 is in power supply switching is completed.
The invention provides a method suitable for on-site rapid spare power automatic switching of a ring network line of a power distribution network, wherein when a ring network cable fails, a fault protection device of each ring network unit trips off a circuit breaker at a protection installation position to carry out fault isolation, and sends a starting spare switching signal to a next-stage subsection spare power automatic switching device; when the ring network unit bus fails, the incoming line fault protection device of the fault bus trips an incoming line breaker of the fault bus in parallel to perform fault isolation with a bus outgoing line breaker, and meanwhile, the incoming line breaker of the next ring network unit is tripped in parallel, and the incoming line breaker of the next ring network unit sends a starting standby switching signal to the corresponding sectional standby automatic switching device of the next ring network unit.
After the sectional spare power automatic switching device receives a starting spare switching signal sent by the fault protection device of the ring network unit, the incoming line is confirmed to be tripped and no power supply voltage exists, the fault bus is isolated, the power supply voltage of the bus to be switched is normal, and the standby switching device is charged completely, then the closing action of the sectional breaker of the ring network unit is controlled after a time delay set time period, and the bus in the ring network unit is switched to supply power.
The invention provides a system suitable for on-site fast spare power automatic switching of a ring network line of a power distribution network, which comprises a fault protection device and a sectional spare power automatic switching device;
when the looped network cable fails, the fault protection device of the looped network unit trips to protect a breaker at an installation position for fault isolation, and sends a starting standby switching signal to a next-stage sectional spare power automatic switching device; when a bus of a ring network unit fails, an incoming line fault protection device of the fault bus trips an incoming line breaker of the fault bus in parallel to perform fault isolation with an outgoing line breaker of the bus, and simultaneously trips an incoming line breaker of a next ring network unit, and the incoming line breaker of the next ring network unit sends a standby switching starting signal to a sectional standby automatic switching device of the stage;
after the segmented spare power automatic switching device receives a starting spare switching signal sent by a fault protection device of the ring network unit, the incoming line is confirmed to be tripped, the fault bus has no power supply voltage, the power supply voltage of the bus to be switched is normal, and the standby switching device is charged completely, and then the action of a combined segmented circuit breaker of the ring network unit is controlled after a time delay set time period, so that the bus is switched to supply power.
Further, the fault protection device comprises a differential protection device and/or a dynamic adaptive protection device.
Further, the action of controlling the on-off breaker of the ring network unit specifically comprises: the data are transmitted to the sectional spare power automatic switching device of the ring network unit in a hard open or GOOSE mode to control the action of the on-off circuit breaker.
Further, the fault bus is already isolated, i.e. the breaker where the fault protection device is located trips, and the continuous trip breaker of the next ring network unit trips.
In summary, the present invention provides a system and a method for local fast backup automatic switching of a ring network line of a power distribution network, wherein when a ring network cable fails, a fault protection device of a ring network unit trips a corresponding circuit breaker for fault isolation, and sends a start backup switching signal. After the segmented spare power automatic switching device receives a starting spare switching signal sent by a fault protection device of the ring network unit, the fact that a fault bus has no power supply voltage is confirmed, the fault is isolated, the power supply voltage of the bus to be switched is normal, and after the spare switching device is charged, the action of a switching breaker of the ring network unit is controlled after a set time period is delayed, and the bus switching power supply is completed. According to the method for on-site rapid spare power automatic switching, the fault protection device is used for transmitting the action signal to the next-stage sectional spare power automatic switching, the switching-on time of the spare power automatic switching of each ring network unit does not need to consider the matching of the level difference, and rapid switching is achieved. The power supply system is suitable for power supply conversion of a multi-level distribution network or a subway large-partition ring network power supply line.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (8)
1. A method for on-site rapid spare power automatic switching suitable for a ring network line of a power distribution network is characterized in that when a ring network cable fails, a fault protection device of a ring network unit trips a circuit breaker at a protection installation position to perform fault isolation, and sends a starting spare switching signal to a next-stage subsection spare power automatic switching device at a fault point;
when a bus of a ring network unit fails, an incoming line fault protection device of the fault bus trips an incoming line breaker of the fault bus in parallel to perform fault isolation with an outgoing line breaker of the bus, and simultaneously trips an incoming line breaker of a next ring network unit, wherein the incoming line breaker of the next ring network unit sends a standby switching starting signal to a current-stage sectional spare automatic switching device;
after the sectional spare power automatic switching device receives the starting spare switching signal, the incoming line is confirmed to be tripped open, the bus does not have power supply voltage, the power supply voltage of the bus to be switched is normal, and the standby switching device is charged completely, then the switching-on action of the sectional circuit breaker of the ring network unit is controlled after a set time period is delayed, and the bus in the ring network unit is switched to supply power.
2. The method for local fast spare power automatic switching of a looped network line of a power distribution network as claimed in claim 1, wherein the fault protection device comprises a differential protection function or a dynamic adaptive protection function.
3. The method for on-site fast spare power automatic switching of the power distribution network ring network line according to claim 1 or 2, wherein the step of controlling the on-off section breaker of the ring network unit specifically comprises the following steps: and starting the spare power automatic switching signal to be transmitted to the sectional spare power automatic switching device of the ring network unit in a hard switching-in or GOOSE mode, and controlling the sectional breaker to be switched on through the judgment of the spare power automatic switching on and switching off.
4. The method for on-site fast spare power automatic switching of the power distribution network ring network line according to claim 1 or 2, characterized in that a fault bus is isolated, that is, a breaker where a bus fault protection device is located is tripped, the same bus outgoing breaker and a next-stage ring network unit incoming breaker are tripped in a gang-tripping mode, and the incoming protection device of the next-stage ring network unit simultaneously sends a starting spare power automatic switching signal to the current-stage ring network unit segment protection spare power automatic switching device.
5. A system suitable for on-site fast spare power automatic switching of a ring network line of a power distribution network is characterized by comprising a fault protection device and a segmented spare power automatic switching device;
when the looped network cable fails, the fault protection device of the looped network unit trips to protect a breaker at an installation position for fault isolation, and sends a starting standby switching signal to a next-stage sectional standby automatic switching device at a fault point;
when a bus of a ring network unit fails, an incoming line fault protection device of the fault bus trips an incoming line breaker of the fault bus in parallel to perform fault isolation with an outgoing line breaker of the bus, and simultaneously trips an incoming line breaker of a next ring network unit, wherein the incoming line breaker of the next ring network unit sends a standby switching starting signal to a current-stage sectional spare automatic switching device;
after the sectional spare power automatic switching device receives the starting spare switching signal, the incoming line is confirmed to be tripped open, the fault bus has no power supply voltage, the power supply voltage of the bus to be switched is normal, and the standby switching device is charged completely, and then the combined sectional circuit breaker of the ring network unit is controlled to act after a time delay setting time period, so that power supply conversion of the bus is completed.
6. The system for on-site fast spare power automatic switching of a looped network line of a power distribution network as claimed in claim 5, wherein the fault protection device comprises a differential protection device protection function or a dynamic adaptive protection function.
7. The system for on-site fast spare power automatic switching of a power distribution network ring network line according to claim 5 or 6, wherein the action of the on-off section breaker of the ring network unit specifically comprises: and a starting spare power automatic switching signal is transmitted to the sectional spare power automatic switching device of the ring network unit in a hard switching-in or GOOSE mode, and the sectional breaker is controlled to be switched on through spare power automatic switching-on and switching-off judgment.
8. The system for on-site fast spare power automatic switching of a power distribution network ring network line as claimed in claim 5 or 6, wherein the fault bus is isolated, that is, the breaker where the bus fault protection device is located is tripped, the tripping same bus outgoing line breaker and the next ring network unit incoming line breaker are tripped, and the incoming line protection device of the next ring network unit simultaneously sends a starting spare power automatic switching signal to the current ring network unit segment protection spare power automatic switching device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011077460.6A CN112383033A (en) | 2020-10-10 | 2020-10-10 | System and method suitable for local rapid spare power automatic switching of power distribution network ring network line |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011077460.6A CN112383033A (en) | 2020-10-10 | 2020-10-10 | System and method suitable for local rapid spare power automatic switching of power distribution network ring network line |
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| CN202011077460.6A Pending CN112383033A (en) | 2020-10-10 | 2020-10-10 | System and method suitable for local rapid spare power automatic switching of power distribution network ring network line |
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Cited By (1)
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| CN113783293A (en) * | 2021-07-20 | 2021-12-10 | 珠海万力达电气自动化有限公司 | Railway electric power operation and maintenance operation management and control system and method |
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