CN111371168A - Double-loop power supply automatic control system - Google Patents
Double-loop power supply automatic control system Download PDFInfo
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- CN111371168A CN111371168A CN201811595905.2A CN201811595905A CN111371168A CN 111371168 A CN111371168 A CN 111371168A CN 201811595905 A CN201811595905 A CN 201811595905A CN 111371168 A CN111371168 A CN 111371168A
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- 238000012546 transfer Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- XQFCCTPWINMCQJ-UHFFFAOYSA-N 1-(1H-indol-3-yl)-N,N-dimethylpropan-2-amine Chemical compound CC(N(C)C)CC1=CNC2=CC=CC=C12 XQFCCTPWINMCQJ-UHFFFAOYSA-N 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
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Classifications
-
- 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
- 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
- H02J9/002—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which a reserve is maintained in an energy source by disconnecting non-critical loads, e.g. maintaining a reserve of charge in a vehicle battery for starting an engine
-
- 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
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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)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a double-loop power supply automatic control system, which comprises: two paths of power supplies are respectively connected with two sections of buses to supply power to the two buses; each section of bus is provided with an incoming line breaker to control the power supply condition of the bus; wherein, each section of bus is respectively connected with a primary load, a secondary load and a tertiary load to supply power for each stage of load; each stage of load is provided with a load switch for controlling the on-off of the load; the bus tie breaker is connected between the two sections of buses; the PLC equipment comprises a microcontroller and is used for collecting the running condition of a power supply; the PCL equipment is in communication connection with the incoming line circuit breaker and the bus coupler circuit breaker respectively to realize data interaction; when the bus-tie breaker normally operates, the bus-tie breaker is in a switching-off state, and two buses are guaranteed to normally operate respectively. The system can realize automatic switching of double-loop power supply, automatically recover normal power supply when a fault loop recovers power supply, and has remote automatic or manual control.
Description
Technical Field
The invention relates to the field of power supply control. More particularly, the present invention relates to an automatic control system for a dual-loop power supply.
Background
With the development of society, the demand and the dependence of human beings on electricity are more and more extensive, and our life and work can not leave the electricity at any time. Especially important power supply places which do not allow power failure, such as hospitals, banks, airports, subways, high-rise buildings and the like. How to improve the power supply reliability is to adopt a dual-loop power supply mode to improve the power supply reliability in the important power supply places. For 400V power supply with small power load, a double-power-supply change-over switch with relatively mature technology can be adopted to realize automatic switching of two paths of power sources; however, for a 400V power supply system with large power load capacity, a power supply scheme of two paths of incoming lines and one bus coupler is usually adopted, and during normal power supply, two incoming line circuit breakers are switched on and operate and respectively carry I-section and II-section loads, and the bus coupler circuit breaker is in a switching-off state. When one power supply fails or is overhauled, the incoming line breaker is opened, the bus-tie breaker is manually closed, and the other power supply carries all loads of the first section and the second section. And when the power supply is recovered from the fault power supply, manually recovering the power supply. The manual switching operation is carried out manually, so that the power failure time is long, the efficiency is low, the safety is low, and misoperation is easily caused. At present, some international companies develop automatic switching controllers of bus tie breakers, which realize automatic switching of two paths of power supplies, such as a schneider ATMT automatic power supply conversion system, but the system has high cost and relatively single and fixed functions, can not automatically switch non-important three-level loads when a single power supply supplies power, and is difficult to be applied to places with large power supply load capacity, multiple load types, high safety and reliability requirements and high intelligent degree requirements, such as large airport power supply, subway system power supply and the like.
Disclosure of Invention
The invention provides a double-loop power supply automatic control system which can realize automatic switching of double-loop power supply, automatically recover normal power supply when a fault loop recovers power supply and has remote automatic or manual control.
In order to achieve the above object, the present invention provides an automatic control system for a dual-circuit power supply, comprising:
two paths of power supplies are respectively connected with two sections of buses to supply power to the two buses; each section of bus is provided with an incoming line breaker to control the power supply condition of the bus; wherein, each section of bus is respectively connected with a primary load, a secondary load and a tertiary load to supply power for each stage of load; each stage of load is provided with a load switch for controlling the on-off of the load;
the bus tie breaker is connected between the two sections of buses;
the PLC equipment comprises a microcontroller and is used for collecting the running condition of a power supply;
the PCL equipment is in communication connection with the incoming line circuit breaker and the bus coupler circuit breaker respectively to realize data interaction;
when the bus-tie breaker normally operates, the bus-tie breaker is in a switching-off state, and the two buses are ensured to normally operate respectively;
when one of the power supplies is abnormal, the PLC device cuts off the incoming line breaker of the power supply, closes the load switch of the tertiary load on the circuit on the other section of the bus, and controls the bus-tie breaker to be in a closing state, so that the secondary load of the fault bus section is converted to be borne by the other section of the bus, and normal operation is guaranteed.
Preferably, in the automatic control system for the double-loop power supply, when the power supply of the double-loop power supply is recovered to be normal, the PLC device controls the bus tie breaker to be switched to an open state, so that the two buses respectively run; and controlling an incoming line breaker corresponding to the power supply to be switched on automatically, and simultaneously switching on a load switch of a three-level load on the non-fault circuit to be put into use.
Preferably, in the automatic control system of the double-loop power supply, the load stage number is divided into a first stage, a second stage and a third stage according to the importance degree.
Preferably, in the automatic control system for a dual-loop power supply, when the power supply is abnormal, the following specific steps are performed: the power supply is under voltage.
Preferably, the automatic control system for a dual-loop power supply further includes:
the host computer, its with inlet wire circuit breaker, bus-bar circuit breaker and PLC equipment communication is connected, the host computer is according to operating personnel's operating instruction control the divide-shut brake state of inlet wire circuit breaker, bus-bar circuit breaker controls the state of PLC equipment.
Preferably, the double-loop power supply automatic control system, the incoming line circuit breaker and the bus circuit breaker are both provided with manual switches.
The invention at least comprises the following beneficial effects:
1. the power supply safety and reliability are high;
2. various operation modes such as local manual operation, local automatic operation, remote manual operation, remote automatic operation and the like can be realized, and the on-site maintenance and remote control are convenient;
3. when one path of power supply fails and the single power supply supplies power, the unimportant three-stage load can be automatically cut off through the dual-power control system, so that the power supply of the important load is ensured;
4. when the power supply of the fault power supply is recovered, all three-stage loads are automatically switched on through the dual-power-supply control system, and the normal power supply mode of the dual-loop power supply in a segmented power supply mode is automatically recovered;
5. the method is suitable for important power supply places with large power supply load capacity and various loads.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of an automatic control system of a dual-loop power supply according to embodiment 1;
fig. 2 is a schematic structural diagram of an automatic control system of a dual-loop power supply according to embodiment 2.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example 1
As shown in fig. 1, the present invention provides an automatic control system for dual-loop power supply, comprising:
two paths of power supplies are respectively connected with two sections of buses to supply power to the two buses; each section of bus is provided with an incoming line breaker to control the power supply condition of the bus; wherein, each section of bus is respectively connected with a primary load, a secondary load and a tertiary load to supply power for each stage of load; each stage of load is provided with a load switch for controlling the on-off of the load; the load stage number is divided into a first stage, a second stage and a third stage according to the importance degree.
The bus tie breaker is connected between the two sections of buses; the incoming line circuit breaker and the bus circuit breaker are both provided with manual switches.
The PLC equipment comprises a microcontroller and is used for collecting the running condition of a power supply;
the PCL equipment is in communication connection with the incoming line circuit breaker and the bus coupler circuit breaker respectively to realize data interaction;
when the bus-tie breaker normally operates, the bus-tie breaker is in a switching-off state, and the two buses are ensured to normally operate respectively;
when one of the power supplies is abnormal (the power supply loses voltage), the PLC device cuts off the incoming line breaker of the power supply, closes the load switch of the tertiary load on the circuit on the other section of bus, and controls the bus-coupled breaker to be in a switching-on state, so that the secondary load of the fault bus section is converted to be borne by the other section of bus, and normal operation is guaranteed.
When the power supply of the circuit is recovered to be normal, the PLC equipment controls the bus tie breaker to be switched to an open state, so that the two buses respectively run; and controlling an incoming line breaker corresponding to the power supply to be switched on automatically, and simultaneously switching on a load switch of a three-level load on the non-fault circuit to be put into use.
Further comprising:
the host computer, its with inlet wire circuit breaker, bus-bar circuit breaker and PLC equipment communication is connected, the host computer is according to operating personnel's operating instruction control the divide-shut brake state of inlet wire circuit breaker, bus-bar circuit breaker controls the state of PLC equipment.
Example 2
As shown in fig. 2, a 0.4kv bus is a single bus segment connection, and a bus segment breaker is provided. Under the normal operation mode, two inlet wire circuit breakers 1QF and 2QF are in the switch-on position, and a bus section circuit breaker 3QF is in the switch-off position. And the 0.4kV I and II section buses operate in a subsection mode and share the power supply of the first, second and third-level loads of power illumination in the power supply range of the substation. A0.4 kV system is provided with a conversion breaker and can be switched in various modes. The various modes of operation are described in detail below.
1.1 switching breaker arrangement
(1) The main cabinet is provided with 1 3-position change-over switch (the change-over switch of the backup automatic switching mode selective breaker): on-site/automatic-throwing self-restoring, on-site/hand-throwing hand-restoring and remote-position)
(2) A remote control mode soft pressing plate is arranged on the power monitoring software, and the power monitoring software is divided into two states of automatic switching, automatic resetting and point control.
(3) The incoming line circuit breaker, the bus tie circuit breaker and the three-level load main circuit breaker are not provided with local remote transfer switches and are uniformly controlled by a spare power automatic switching mode selection circuit breaker transfer switch of the bus tie cabinet.
(4) Other frame breakers are provided with local remote transfer switches.
1.2 spare power automatic switching mode selection and breaker mode description
(1) When in the 'on-site/hand-throwing and hand-returning' position, the control can be carried out by hand on the site, the remote control cannot be carried out, and the self-throwing is not carried out on the site.
(2) When the position is 'on-site/automatic switching and automatic resetting', the control can not be performed by hand on the site, the control can not be performed remotely, and the automatic switching and automatic resetting are realized through a PLC.
(3) In the "remote" location, it is not controllable in situ.
If the 'remote control mode soft pressing plate' is in a 'point control' position, the soft pressing plate cannot be controlled on the spot, can be controlled remotely, and cannot be automatically thrown and reset.
If the 'remote control mode soft pressing plate' is in the 'automatic switching and automatic resetting' position, the control is not available on the spot, the remote control is not available, and the PLC realizes the automatic switching and automatic resetting.
The low-voltage 0.4kV bus is a single bus segment and is provided with a bus coupler circuit breaker. When the breaker works normally, the two incoming line low-voltage circuit breakers are all put into operation, the bus coupler circuit breaker is located at a brake separating position, and a 0.4kV bus operates in a segmented mode. When one path of power supply loses voltage, the incoming line breaker trips in a delayed mode, the bus tie switch automatically switches on, the three-level load is automatically cut off at the same time, the other path of power supply bears all the first-level load and the second-level load, when the voltage of the power supply recovers, the bus tie switch automatically opens, the incoming line switch of the power supply automatically switches on, and the three-level load automatically recovers power supply. The process of the standby power supply for voltage loss automatic switching and incoming call automatic resetting is controlled by an independent PLC. When the incoming line is manually opened and the incoming line is tripped due to faults, the bus coupler cannot automatically switch.
0.4 kV's inlet wire circuit breaker, female circuit breaker, PLC etc. all have the data transmission function, can carry out data transmission with the host computer to accessible PLC realizes inlet wire, female remote control who allies oneself with, tertiary load switch.
Each section of 0.4kV low-voltage bus is provided with a three-level load switch, and the three-level load is automatically cut off and the power supply of the three-level load is automatically recovered along with the switching-in and the switching-off of the bus-tie breaker.
The 0.4kV incoming line circuit breaker and the bus tie circuit breaker are provided with local/automatic switching and automatic resetting, local/manual switching and manual resetting and remote transfer switches.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (6)
1. A dual-loop power supply automatic control system is characterized by comprising:
two paths of power supplies are respectively connected with two sections of buses to supply power to the two buses; each section of bus is provided with an incoming line breaker to control the power supply condition of the bus; wherein, each section of bus is respectively connected with a primary load, a secondary load and a tertiary load to supply power for each stage of load; each stage of load is provided with a load switch for controlling the on-off of the load;
the bus tie breaker is connected between the two sections of buses;
the PLC equipment comprises a microcontroller and is used for collecting the running condition of a power supply;
the PCL equipment is in communication connection with the incoming line circuit breaker and the bus coupler circuit breaker respectively to realize data interaction;
when the bus-tie breaker normally operates, the bus-tie breaker is in a switching-off state, and the two buses are ensured to normally operate respectively;
when one of the power supplies is abnormal, the PLC device cuts off the incoming line breaker of the power supply, closes the load switch of the tertiary load on the circuit on the other section of the bus, and controls the bus-tie breaker to be in a closing state, so that the secondary load of the fault bus section is converted to be borne by the other section of the bus, and normal operation is guaranteed.
2. The automatic control system of the double-loop power supply as claimed in claim 1, wherein when the power supply of the loop is recovered to be normal, the PLC device controls the bus-coupled circuit breaker to be switched to an open state, so that the two buses are respectively operated; and controlling an incoming line breaker corresponding to the power supply to be switched on automatically, and simultaneously switching on a load switch of a three-level load on the non-fault circuit to be put into use.
3. The automatic control system for a dual-circuit power supply of claim 1, wherein the number of load stages is divided into one stage, two stages and three stages in order according to the degree of importance.
4. The dual-loop power supply automatic control system according to claim 1, wherein when the power supply is abnormal, the power supply comprises: the power supply is under voltage.
5. The dual-circuit power automatic control system of claim 1, further comprising:
the host computer, its with inlet wire circuit breaker, bus-bar circuit breaker and PLC equipment communication is connected, the host computer is according to operating personnel's operating instruction control the divide-shut brake state of inlet wire circuit breaker, bus-bar circuit breaker controls the state of PLC equipment.
6. The automatic control system for the double-loop power supply of claim 1, wherein the incoming line breaker and the bus breaker are both provided with manual switches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811595905.2A CN111371168A (en) | 2018-12-25 | 2018-12-25 | Double-loop power supply automatic control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811595905.2A CN111371168A (en) | 2018-12-25 | 2018-12-25 | Double-loop power supply automatic control system |
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| CN111371168A true CN111371168A (en) | 2020-07-03 |
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| CN201811595905.2A Pending CN111371168A (en) | 2018-12-25 | 2018-12-25 | Double-loop power supply automatic control system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111817428A (en) * | 2020-07-21 | 2020-10-23 | 中国南方电网有限责任公司超高压输电公司昆明局 | Control method and control device for automatic bus transfer switch |
| CN113284387A (en) * | 2021-05-24 | 2021-08-20 | 上海地铁维护保障有限公司 | 400V spare power automatic switching simulation platform |
| CN113922362A (en) * | 2021-09-24 | 2022-01-11 | 国网北京市电力公司 | Circuit breaker control system and method |
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Cited By (5)
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