CN110912253B - Low-voltage intelligent spare power automatic switching system - Google Patents

Low-voltage intelligent spare power automatic switching system Download PDF

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Publication number
CN110912253B
CN110912253B CN201911167553.5A CN201911167553A CN110912253B CN 110912253 B CN110912253 B CN 110912253B CN 201911167553 A CN201911167553 A CN 201911167553A CN 110912253 B CN110912253 B CN 110912253B
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bus
load
switch
voltage
automatic switching
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CN201911167553.5A
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CN110912253A (en
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张翔
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Guangdong Power Grid Co Ltd
Dongguan Power Supply Bureau of Guangdong Power Grid Co Ltd
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Guangdong Power Grid Co Ltd
Dongguan Power Supply Bureau of Guangdong Power Grid Co Ltd
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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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • 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
    • 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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • 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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • 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
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems

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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The embodiment of the invention discloses a low-voltage intelligent spare power automatic switching system, which comprises a low-voltage intelligent spare power automatic switching device for connecting buses of a power distribution room A and a power distribution room B, wherein the low-voltage intelligent spare power automatic switching device is used for collecting bus line data in the power distribution room A and the power distribution room B and realizing a spare power automatic switching function by controlling switches connected to each line through wireless communication. According to the embodiment of the invention, the low-voltage intelligent standby automatic switching device is used for collecting the electrical data such as the bus voltage, the switch position and the real-time current of the two power distribution rooms, so that the standby automatic switching functions such as an automatic disconnection incoming line switch, a disconnection switch and the like are realized.

Description

Low-voltage intelligent spare power automatic switching system
Technical Field
The embodiment of the invention relates to the technical field of low-voltage automatic spare power switching, in particular to a low-voltage intelligent automatic spare power switching system.
Background
When the power system is excessively high in power generation and power utilization load, a part of secondary loads which are arranged in advance in the system are needed to be removed according to action load values which are set in advance, so that the system lightens the load and returns to a normal running state.
Disclosure of Invention
Therefore, the embodiment of the invention provides a low-voltage intelligent spare power automatic switching system, which aims to solve the problem of transformer damage caused by overload of a power system in the prior art.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
in one aspect of the embodiment of the invention, a low-voltage intelligent spare power automatic switching system is provided, which comprises a low-voltage intelligent spare power automatic switching device for connecting buses of a power distribution room A and a power distribution room B, wherein the low-voltage intelligent spare power automatic switching device is used for collecting bus line data in the power distribution room A and the power distribution room B and realizing a spare power automatic switching function by controlling switches connected to each line through wireless communication.
As a preferable scheme of the invention, the low-voltage intelligent spare power automatic switching device is respectively connected with an IA bus of a power distribution room A and an IB bus of the power distribution room in a wireless communication mode, the IA bus is connected with a transformer A, the IB bus is connected with a transformer B, the IA bus is connected with a plurality of feeder lines A, the IB bus is connected with a plurality of feeder lines B, and the feeder lines A and the feeder lines B are connected to the low-voltage intelligent spare power automatic switching device through an RS485 communication module.
As a preferred embodiment of the present invention, a voltage acquisition module is disposed on the IA bus and the IB bus.
As a preferable scheme of the invention, a current acquisition module and a switch A are arranged between the IA bus and the transformer A, a current acquisition module and a switch B are arranged between the IB bus and the transformer B, and the low-voltage intelligent standby automatic switching device is in wireless communication connection with the switch A and the switch B.
As a preferable scheme of the invention, two ends of the transformer A and the transformer B are connected with voltage acquisition modules.
As a preferable scheme of the invention, a current acquisition module and a switch C are connected between the IA bus and the IB bus, and the low-voltage intelligent spare power automatic switching device is in wireless communication connection with the switch C.
As a preferable scheme of the invention, the IA bus and the IB bus run in sections, the IA bus is out of voltage to lead the transformer to jump to start, then the load value of the out-of-voltage IA bus and the load value of the adjacent IA bus are calculated, and the sum value of the out-of-voltage IA bus load and the load value of the adjacent IA bus is compared with the capacity threshold of the transformer to be put into, so as to see whether the capacity threshold meets the required load size;
if the sum of the load of the IA bus and the load of the adjacent IA bus is smaller than the capacity threshold, disconnecting the voltage-losing IA bus, closing a switch C to complete the load backup automatic switching, and reporting that the bus voltage-losing load backup automatic switching is successful;
if the sum of the load of the IA bus and the load of the adjacent IA bus is larger than the capacity threshold, the load transfer is not immediately carried out, and an IA bus voltage loss and load backup automatic switching failure signal is generated; comparing the load loops, cutting off the load loops in the feeder line of the power distribution room A until the load meets the capacity of the transformer, and then carrying out load transfer;
when any 400V feeder line carried by the IA bus has line fault, the switch A is disconnected;
judging the operation/fault state of each outgoing line loop through a line acquisition unit, preparing to cut off a fault line, or disconnecting an outgoing line switch of the outgoing line loop through the line acquisition unit, or automatically recovering a switch A through a low-voltage intelligent spare power automatic switching device;
when the switch A is restored, if the switch A trips again, the switch C is automatically closed by the low-voltage intelligent spare power automatic switching device to perform bus spare power automatic switching.
As a preferable scheme of the invention, the IA bus and the IB bus run in sections, when the IB bus is out of voltage and faults to cause the transformer to jump to start, the load value of the out-of-voltage IB bus load and the load value of the adjacent IB bus are calculated, and the sum value of the out-of-voltage IB bus load and the load value of the adjacent IB bus is compared with the capacity threshold value of the transformer to be put into, so as to see whether the capacity meets the required load size;
if the sum of the load of the IB bus and the load of the adjacent IB bus is smaller than the capacity threshold, disconnecting the voltage-losing IB bus, closing the switch C to finish load transfer, and reporting that the voltage-losing IB bus load transfer is successful;
if the sum of the load of the IB bus and the load of the adjacent IB bus is larger than the capacity threshold, the load transfer is not immediately carried out, and the IB bus voltage loss and the load backup automatic switching failure signals are concurrent; comparing the load loops, cutting off the load loops in the feeder line of the power distribution room B until the load meets the capacity of the transformer, and then carrying out load transfer;
when any 400V outgoing line carried by the IB bus has line fault, the switch B is disconnected;
judging the operation/fault state of each outgoing line loop through a line acquisition unit, preparing for load shedding, cutting the switch B through the line acquisition unit, and automatically recovering the composite switch B through a low-voltage intelligent automatic backup switching device, if the switch B is tripped correspondingly again, automatically switching on the switch C through the low-voltage intelligent automatic backup switching device, and performing bus automatic backup switching;
and when the bus B fails, locking the switch C and stopping the spare power automatic switching function.
As a preferred embodiment of the present invention, the bus line data includes bus voltage, switch position, and real-time current.
As a preferable scheme of the invention, the low-voltage intelligent standby automatic switching device comprises an automatic breaking incoming line switch and a breaking outgoing line switch.
Embodiments of the present invention have the following advantages:
according to the embodiment of the invention, the low-voltage intelligent standby automatic switching device is used for collecting the electrical data such as the bus voltage, the switch position and the real-time current of the two power distribution rooms, so that the standby automatic switching functions such as an automatic disconnection incoming line switch, a disconnection switch and the like are realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.
Fig. 1 is a schematic diagram of a low-voltage intelligent spare power automatic switching system provided by an embodiment of the invention.
Detailed Description
Other advantages and advantages of the present invention will become apparent to those skilled in the art from the following detailed description, which, by way of illustration, is to be read in connection with certain specific embodiments, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the invention provides a low-voltage intelligent spare power automatic switching system, which comprises a low-voltage intelligent spare power automatic switching device for connecting buses of a power distribution room A and a power distribution room B, wherein the low-voltage intelligent spare power automatic switching device is used for collecting bus line data in the power distribution room A and the power distribution room B, the bus line data comprises bus voltage, switch positions and real-time current, and the spare power automatic switching functions such as automatic disconnection of a wire inlet switch, disconnection of a wire outlet switch and the like are realized.
The intelligent low-voltage spare power automatic switching device is connected with an IA bus of a power distribution room A and an IB bus of the power distribution room in a wireless communication mode respectively, the IA bus is connected with an access transformer A, the IB bus is connected with a transformer B, the IA bus is connected with a plurality of feeder lines A, the IB bus is connected with a plurality of feeder lines B, and the feeder lines A and the feeder lines B are connected to the intelligent low-voltage spare power automatic switching device through an RS485 communication module.
A voltage acquisition module is arranged on the IA bus and the IB bus; a current collection module and a switch A are arranged between the IA bus and the transformer A, and a current collection module and a switch B are arranged between the IB bus and the transformer B; the two ends of the transformer A and the transformer B are connected with voltage acquisition modules; the automatic switching system is characterized in that a current acquisition module and a switch C are connected between the IA bus and the IB bus, and the automatic switching function of the spare power automatic switching is in wireless communication connection with the switch A, the switch B and the switch B.
The IA bus and the IB bus run in sections, the step-down of the IA bus leads to the jump start of the transformer, the load value of the step-down bus and the load value of the adjacent bus are calculated, the sum value of the load of the step-down bus and the load of the adjacent IA bus is compared with the capacity threshold of the transformer to be put into, and whether the capacity meets the required load or not is judged;
if the load sum value is smaller than the capacity threshold value, the voltage-loss low-voltage circuit breaker is disconnected, the load spare power automatic switching is completed by combining the switch C, and the bus voltage-loss load spare power automatic switching is reported to be successful;
if the load sum value is larger than the threshold value of the transfer transformer, the load transfer is not immediately carried out, and the XX bus is out-of-voltage and the load backup automatic switching failure signal is sent; comparing the load loops, cutting off unimportant load loops in the feeder line of the power distribution room A until the load meets the capacity of the transformer, and then carrying out load transfer;
when any 400V feeder line carried by the IA bus has line faults, a top jump switch A;
judging the operation/fault state of each outgoing line loop through a line acquisition unit, preparing to reasonably cut off a fault line, or cutting the outgoing line switch through the line acquisition unit, or automatically recovering the switch A through a low-voltage intelligent spare power automatic switching device;
when the switch A is restored, if the switch A trips again, the switch C is automatically closed by the low-voltage intelligent spare power automatic switching device to perform bus spare power automatic switching.
And the IA bus and the IB bus run in sections, and when the IB bus fails in voltage loss to cause the transformer to jump to start, the load of the voltage loss bus and the load value of the adjacent bus are calculated. Comparing the sum of the load of the voltage-losing bus and the load of the adjacent IB bus with the capacity threshold of the transformer to be put in, and judging whether the capacity meets the required load;
if the load sum value is smaller than the capacity threshold value, the voltage-loss low-voltage circuit breaker is disconnected, the switch C is closed to complete load transfer, and bus voltage-loss load transfer success is reported;
if the load sum value is larger than the threshold value of the transfer transformer, the load transfer is not immediately carried out, and the XX bus is out-of-voltage and the load backup automatic switching failure signal is sent; comparing the load loops, cutting off unimportant load loops in the feeder line of the power distribution room B until the load meets the capacity of the transformer, and then carrying out load transfer;
when any 400V outgoing line carried by the IB bus has line faults, the switch B is jumped;
judging the operation/fault state of each outgoing line loop through a line acquisition unit, preparing for reasonable load shedding, cutting the switch B through the line acquisition unit, automatically recovering the switch B through a low-voltage intelligent automatic spare power switching device, and automatically switching the switch C through the low-voltage intelligent automatic spare power switching device to perform bus automatic spare power switching if the switch B is tripped correspondingly again after recovery;
when the IB bus fails, the switch C is locked, and the spare power automatic switching function is stopped.
The invention can reduce the load to be cut off as much as possible and restore the power supply reliability as soon as possible, the load to be cut off is divided into a plurality of wheels according to the size of the system load, and the load is cut off in sequence in the overload process, so that the phenomenon that the transformer is damaged due to overload of the power system is prevented.
While the invention has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.

Claims (4)

1. The low-voltage intelligent spare power automatic switching system is characterized by comprising a low-voltage intelligent spare power automatic switching device for connecting buses of a power distribution room A and a power distribution room B, wherein the low-voltage intelligent spare power automatic switching device is used for collecting bus line data in the power distribution room A and the power distribution room B and realizing a spare power automatic switching function by controlling switches connected to each line through wireless communication;
the low-voltage intelligent spare power automatic switching device is respectively in wireless communication connection with an IA bus of a power distribution room A and an IB bus of the power distribution room, the IA bus is connected with a transformer A, the IB bus is connected with a transformer B, the IA bus is connected with a plurality of feeder lines A, the IB bus is connected with a plurality of feeder lines B, and the feeder lines A and the feeder lines B are connected to the low-voltage intelligent spare power automatic switching device through an RS485 communication module;
a voltage acquisition module is arranged on the IA bus and the IB bus;
a current acquisition module and a switch A are arranged between the IA bus and the transformer A, a current acquisition module and a switch B are arranged between the IB bus and the transformer B, and the low-voltage intelligent spare power automatic switching device is in wireless communication connection with the switch A and the switch B;
the two ends of the transformer A and the transformer B are connected with voltage acquisition modules;
a current acquisition module and a switch C are connected between the IA bus and the IB bus, and the low-voltage intelligent spare power automatic switching device is in wireless communication connection with the switch C;
the IA bus and the IB bus run in sections, when the voltage of the IA bus is lost and the transformer is started in a jump mode, the load value of the voltage-lost IA bus and the load value of the adjacent IA bus are calculated, the sum value of the voltage-lost IA bus and the load value of the adjacent IA bus is compared with the capacity threshold of the transformer to be put into, and whether the capacity threshold meets the required load or not is judged;
if the sum of the load of the IA bus and the load of the adjacent IA bus is smaller than the capacity threshold, disconnecting the voltage-losing IA bus, closing a switch C to complete the load backup automatic switching, and reporting that the bus voltage-losing load backup automatic switching is successful;
if the sum of the load of the IA bus and the load of the adjacent IA bus is larger than the capacity threshold, the load transfer is not immediately carried out, and an IA bus voltage loss and load backup automatic switching failure signal is generated; comparing the load loops, cutting off the load loops in the feeder line of the power distribution room A until the load meets the capacity of the transformer, and then carrying out load transfer;
when any 400V feeder line carried by the IA bus has line fault, the switch A is disconnected;
judging the operation/fault state of each outgoing line loop through a line acquisition unit, preparing to cut off a fault line, or disconnecting an outgoing line switch of the outgoing line loop through the line acquisition unit, or automatically recovering a switch A through a low-voltage intelligent spare power automatic switching device;
when the switch A is restored, if the switch A trips again, the switch C is automatically closed by the low-voltage intelligent spare power automatic switching device to perform bus spare power automatic switching.
2. The low-voltage intelligent standby power automatic switching system according to claim 1, wherein the IA bus and the IB bus run in sections, when the IB bus fails in voltage loss to cause the transformer to jump to start, the load value of the voltage loss IB bus load and the load value of the adjacent IB bus are calculated, and the sum value of the voltage loss IB bus load and the load value of the adjacent IB bus is compared with a capacity threshold of a transformer to be put into, so as to see whether the capacity meets the required load size;
if the sum of the load of the IB bus and the load of the adjacent IB bus is smaller than the capacity threshold, disconnecting the voltage-losing IB bus, closing the switch C to finish load transfer, and reporting that the voltage-losing IB bus load transfer is successful;
if the sum of the load of the IB bus and the load of the adjacent IB bus is larger than the capacity threshold, the load transfer is not immediately carried out, and the IB bus voltage loss and the load backup automatic switching failure signals are concurrent; comparing the load loops, cutting off the load loops in the feeder line of the power distribution room B until the load meets the capacity of the transformer, and then carrying out load transfer;
when any 400V outgoing line carried by the IB bus has line fault, the switch B is disconnected;
judging the operation/fault state of each outgoing line loop through a line acquisition unit, preparing for load shedding, cutting the switch B through the line acquisition unit, and automatically recovering the composite switch B through a low-voltage intelligent automatic backup switching device, if the switch B is tripped correspondingly again, automatically switching on the switch C through the low-voltage intelligent automatic backup switching device, and performing bus automatic backup switching;
and when the bus B fails, locking the switch C and stopping the spare power automatic switching function.
3. The low voltage intelligent backup power automatic switching system of claim 1, wherein the bus line data comprises bus voltage, switch position, and real-time current.
4. The low-voltage intelligent spare power automatic switching system according to claim 1, wherein the low-voltage intelligent spare power automatic switching device comprises an automatic disconnection incoming line switch and a disconnection outgoing line switch.
CN201911167553.5A 2019-11-25 2019-11-25 Low-voltage intelligent spare power automatic switching system Active CN110912253B (en)

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CN112217201B (en) * 2020-09-25 2022-07-12 广东电网有限责任公司 High-low voltage dual-power-supply dual-loop network power supply system and spare power automatic switching control method
CN112713586A (en) * 2020-12-08 2021-04-27 广东卡特能源科技有限公司 Low-voltage intelligent power distribution self-healing and power supply switching control system
CN114336947A (en) * 2022-01-04 2022-04-12 中国电建集团成都勘测设计研究院有限公司 Automatic standby power supply switching system and method

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