CN112582989B - Power system for preventing backup power automatic switching on and switching off of fault bus and control method thereof - Google Patents
Power system for preventing backup power automatic switching on and switching off of fault bus and control method thereof Download PDFInfo
- Publication number
- CN112582989B CN112582989B CN202011487685.9A CN202011487685A CN112582989B CN 112582989 B CN112582989 B CN 112582989B CN 202011487685 A CN202011487685 A CN 202011487685A CN 112582989 B CN112582989 B CN 112582989B
- Authority
- CN
- China
- Prior art keywords
- switch
- fault
- bus
- automatic switching
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
-
- 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
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/262—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 involving signal transmission between at least two stations involving transmissions of switching or blocking orders
-
- 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
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/263—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 involving signal transmission between at least two stations involving transmissions of measured values
-
- 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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
-
- 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
- Y04S20/12—Energy storage units, uninterruptible power supply [UPS] systems or standby or emergency generators, e.g. in the last power distribution stages
-
- 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
- Y04S20/248—UPS systems or standby or emergency generators
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stand-By Power Supply Arrangements (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The embodiment of the invention discloses an electric power system for preventing a spare power automatic switching on and switching off on a fault bus and a control method thereof. The power system comprises a power supply side protection device, a weak feed side protection device and a spare power automatic switching device, wherein the power supply side protection device is connected with the weak feed side protection device, and the weak feed side protection device is connected with the spare power automatic switching device; the power supply side protection device, the weak current feed side protection device and the spare power automatic switching device are used for protecting the power system and preventing the spare power automatic switching from being switched on a fault bus. Compared with the prior art, the embodiment of the invention is beneficial to preventing the spare power automatic switching-on from being carried out on the fault bus, thereby preventing the serious loss and consequence caused by the spare power automatic switching-on from being carried out on the fault bus.
Description
Technical Field
The embodiment of the invention relates to the technical field of power systems, in particular to a power system for preventing a spare power automatic switching on and switching off from a fault bus and a control method thereof.
Background
An automatic switching device (referred to as backup automatic switching) of a backup power supply is important equipment for improving power supply reliability in a power system. However, the existing backup automatic switching logic cannot judge whether a fault occurs on the bus, and the backup power is often switched on the fault bus, so that the system and the fault bus equipment are impacted and damaged again.
Referring to fig. 1, when the weak feed side bus fails, the operation conditions of the relevant devices are as follows:
1. the main supply line acts for opposite side backup protection (distance II section and zero sequence II section), and a first switch 1DL is tripped;
2. a first switch 1DL is switched on at an outlet of the protection reclosing switch on the opposite side;
3. when the side reclosing is in fault, the first switch 1DL is switched off in an accelerated mode;
4. when the spare power automatic switching time limit of the side is reached, the action conditions of the voltage loss of a weak feed side bus and the voltage of a second voltage detection device TYD2 on a spare circuit are detected, and the like, and when no discharge locking condition exists, the spare power automatic switching acts: the second switch 2DL of the main supply line is tripped first, and the fourth switch 4DL of the standby line is closed when the tripping position of the second switch 2DL is received and the blocking conditions of 'current blocking' and the like are not received.
And because the fault occurs on the bus, the spare line is combined with the fault bus, and the fault bus is impacted again. In particular, once a GIS bus device is damaged due to a fault, long-time power failure repair is needed, and the consequences that a user has large-area long-time power failure, the equipment maintenance cost is high and the like are caused.
In summary, a bus fault occurs occasionally, when a bus loses voltage due to the fault, the logic of the existing backup automatic switching device cannot identify whether the bus is in the fault or the line fault, and the backup power supply is often switched on the fault bus, so that the system is impacted again and the fault bus is damaged again.
Disclosure of Invention
The embodiment of the invention provides a power system for preventing a spare power automatic switching switch from being switched on a fault bus and a control method thereof, so as to prevent serious loss and consequence caused by the spare power automatic switching switch from being switched on the fault bus.
In a first aspect, an embodiment of the present invention provides an electric power system for preventing a backup power automatic switch from being switched on a faulty bus, including:
a power supply side bus and a weak feed side bus;
the main supply circuit is connected between the power supply side bus and the weak feed side bus and comprises a first switch and a second switch which are connected in series, the first switch is a power supply side switch, and the second switch is a weak feed side switch;
the standby circuit is connected with the main power supply circuit in parallel and comprises a third switch and a fourth switch which are connected in series, the third switch is a power supply side switch, and the fourth switch is a weak feed side switch;
the first voltage detection device is connected to the main supply line and used for detecting the voltage of the weak feed side of the main supply line;
the second voltage detection device is connected to the standby circuit and used for detecting the voltage of the weak feed side of the standby circuit;
the third voltage detection device is connected to the weak feed side bus and used for detecting the voltage of the weak feed side bus;
the system comprises a power supply side protection device, a weak feed side protection device and a spare power automatic switching device, wherein the power supply side protection device is connected with the weak feed side protection device, and the weak feed side protection device is connected with the spare power automatic switching device; the power supply side protection device, the weak current feedback side protection device and the spare power automatic switching device are used for protecting the power system and preventing the spare power automatic switching from being switched on a fault bus.
Optionally, the power supply side protection device is configured to provide main protection and backup protection, where the backup protection includes a first time limit and a second time limit, and in the first time limit, a long jump command is sent to the weak feed side; controlling the backup protection to trip the power supply side switch in the second time limit;
the weak feed side protection device is used for providing incoming line protection, the incoming line protection comprises a first control mode and a second control mode, and the first control mode is that a remote jump is thrown without starting a control word at the side; the second control mode is to send a far jump signal to the spare power automatic switching device;
the spare power automatic switching device is used for judging a fault position and locking the spare power automatic switching, the judging of the fault position comprises receiving a separating signal of the second switch and receiving a voltage signal of the first voltage detection device, if the voltage signal is provided, a fault occurs in a bus area, and a locking reclosing control word is output to the weak feed side protection device and the spare power automatic switching is locked.
Optionally, the power system is configured with fiber current differential protection, and the power supply side protection device is connected with the weak feed side protection device through a fiber channel.
Optionally, the weak feed side bus is a GIS bus.
Optionally, the first switch, the second switch, the third switch and the fourth switch are all circuit breakers.
Optionally, the first voltage detection device, the second voltage detection device, and the third voltage detection device are all voltage transformers.
In a second aspect, an embodiment of the present invention further provides a control method for an electric power system for preventing a backup power automatic switching device from being switched on a faulty bus according to any embodiment of the present invention, where the control method includes:
if the fault of the power system is a bus area fault, the main protection of the power supply side protection device does not act, and the backup protection acts;
in a first time limit, the power supply side protection device sends a long jump command to the weak feed side protection device;
the weak feed side protection device receives the far jump command, throws a control word that the far jump does not pass through the start of the side, controls the second switch to trip off, and sends a far jump as a signal to the spare power automatic switching device;
the second switch is tripped off, and a switch position dividing signal is switched into the spare power automatic switching device; meanwhile, a second time limit of backup protection of the power supply side protection device returns, and the first switch is kept in a closed state;
the spare power automatic switching device receives the far jumping signal, the switch position dividing signal and the voltage signal of the first voltage detection device and judges whether the main supply line has voltage or not;
if the voltage is present, the fault occurs in a bus area, and the spare power automatic switching device controls the weak feed side protection device to lock reclosing and lock spare power automatic switching.
Optionally, the control method of the power system for preventing the backup power automatic switching from being switched on the fault bus further includes:
if the power system fault is a non-bus area fault, the main protection action of the power supply side protection device trips the first switch and the second switch, and then the switch is closed again;
if the fault is a permanent fault, switching on a reclosing switch to accelerate tripping after the fault, and losing voltage of the weak feedback side bus;
the spare power automatic switching device receives a voltage signal of the first voltage detection device and detects that the weak feed side bus is in voltage loss; the backup power automatic switching device receives a voltage signal of the second voltage detection device, detects that the backup line has voltage and reaches a time limit;
an action outlet for tripping the second switch;
and if the standby line input condition is met, closing the fourth switch.
Optionally, the bus bar zone fault comprises: bus fault, bus disconnecting link fault or malignant misoperation.
Optionally, the determining whether the main supply line has a pressure includes:
and judging whether the voltage signal is greater than a voltage threshold value or not.
According to the embodiment of the invention, under the condition that the main protection does not act, the backup protection action is used for preliminarily judging that the fault is not in the line protection area, the long trip function configured by the line is further fully utilized, the weak feed side switch is tripped long first in the backup first time limit, and the bus area is isolated from the line area; and in a short time window that a switch at the power supply side (the local side) is not disconnected, whether the first voltage detection device of the main power supply line has voltage or not is quickly detected, so that whether the fault occurs at the line side of the disconnected switch or the bus side is finally determined, and therefore sufficient evidence can be provided for locking the spare power automatic switch or locking the reclosing. The power system and the control method thereof provided by the embodiment of the invention can accurately and reliably judge that the fault occurs in the non-line area (between the circuit breakers at two sides of the main supply line). As long as a fault occurs in a non-line area, such as a bus, embodiments of the present invention can control the preparation of the automatic switching device to be inoperative. Specifically, when the fault point is judged to be in the non-line area, the locking spare power automatic switching device can be switched off, and the locking reclosing device can also be switched off. However, in the prior art, when a fault occurs on a bus, a first impact is caused, a circuit reclose causes a second impact, and a backup power automatic switching action is applied to the fault bus, so that a third impact is caused. According to the embodiment of the invention, after the fault is accurately and reliably judged to be located in the bus, the reclosing and the spare power automatic switching are locked, and the secondary impact and the third impact are avoided, so that the heavy loss and the consequence caused by the fact that the spare power automatic switching is mistakenly combined with the fault bus are avoided.
In addition, the embodiment of the invention can further deeply fuse a protection and self-installation device, fully utilizes the existing equipment (optical fiber channel) and functions (long jump), can avoid the serious loss and consequence caused by the fault bus of the spare power automatic switching only by making very simple setting and modification on the original equipment and a loop, is extremely easy to popularize and has considerable effect.
Drawings
Fig. 1 is a schematic structural diagram of a conventional power system;
fig. 2 is a schematic structural diagram of an electric power system for preventing a backup power automatic switch from being switched on a fault bus according to a first embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 2 is a schematic structural diagram of an electric power system for preventing a backup power automatic switching device from being switched on a fault bus according to an embodiment of the present invention. Referring to fig. 2, the power system for preventing the backup power automatic switch from being switched on the fault bus comprises:
a power supply side bus 10 and a weak feed side bus 20;
the main supply circuit is connected between the power supply side bus 10 and the weak feed side bus 20 and comprises a first switch 1DL and a second switch 2DL which are connected in series, the first switch 1DL is a power supply side switch, and the second switch 2DL is a weak feed side switch;
the standby circuit is connected with the main supply circuit in parallel and comprises a third switch 3DL and a fourth switch 4DL which are connected in series, the third switch 3DL is a power supply side switch, and the fourth switch 4DL is a weak feed side switch;
the first voltage detection device TYD1 is connected to the main supply line and used for detecting the voltage of the weak feed side of the main supply line;
the second voltage detection device TYD2 is connected to the standby line and used for detecting the voltage of the weak feed side of the standby line;
the third voltage detection device PT is connected to the weak feed side bus 20 and used for detecting the voltage of the weak feed side bus 20;
the power supply side protection device 30, the weak feed side protection device 40 and the spare power automatic switching device 50 are connected, the power supply side protection device 30 is connected with the weak feed side protection device 40, and the weak feed side protection device 40 is connected with the spare power automatic switching device 50; the power supply side protection device 30, the weak feed side protection device 40 and the spare power automatic switching device 50 are used for protecting the power system and preventing the spare power automatic switching device from being switched on a fault bus.
The first switch 1DL, the second switch 2DL, the third switch 3DL, and the fourth switch 4DL are, for example, circuit breakers. Specifically, the first switch 1DL and the second switch 2DL are switches (breakers) on both sides of a main supply line, respectively, the third switch 3DL and the fourth switch 4DL are switches (breakers) on both sides of a standby line, respectively, solid indicates that the switches are in closed positions, and open indicates that the switches are in open positions. First voltage detection device TYD1, second voltage detection device TYD2 and third voltage detection device PT are voltage transformer for example. Specifically, the first voltage detection device TYD1 and the second voltage detection device TYD2 are line voltage transformers on the weak feed sides of the main supply line and the standby line, respectively, and are used for collecting a-phase voltage of the line; the third voltage detection device PT is a bus voltage transformer and is used for collecting the three-phase voltage of the weak feed side bus 20.
An electric power system (such as a 110kV line) is provided with optical fiber current differential protection, namely, the optical fiber current differential protection has optical fiber channels for transmitting and communicating switching values and analog quantities on two sides of the line and a long jump function, so that the long jump command can be sent to opposite-side protection by any side protection through the optical fiber channels, and after the opposite-side protection receives the long jump command, the switch can be tripped after certain conditions are passed according to the switching selection of a control word of the opposite-side protection. Optionally, the power-supply-side protection device 30 is connected with the weak-feed-side protection device 40 through a fiber channel. Therefore, the embodiment of the invention can deeply fuse the protection and the self-safety device, fully utilize the existing equipment (optical fiber channel) and functions (long jump), can avoid the serious loss and consequence caused by the fault bus of the spare power automatic switching only by making very simple setting and modification on the original equipment and a loop, is very easy to popularize and has considerable effect.
Specifically, the power-side protection device 30 (including a main power supply line and a backup line) is configured to provide main protection (e.g., fiber differential, distance first section, zero sequence first section) and backup protection, where the backup protection (e.g., distance second section, zero sequence second section, etc.) includes a first time limit T1 and a second time limit T2, and sends a far trip command to the weak feed side at the first time limit T1; and controlling the backup protection tripping power supply side switch in a second time limit T2. The power side protection device 30 includes power side outgoing line protection of the main power supply line and the standby line.
The weak feed side protection device 40 is used for providing incoming line protection, the incoming line protection comprises a first control mode and a second control mode, and the first control mode is that a remote jump is thrown without starting a control word at the side; the second control mode is to send a far jump signal to the backup automatic switching device 50. Wherein the weak feed side protection device 40 includes incoming line protection of the main supply line and the standby line. Only when the remote jump is thrown without starting the control word by the side, the opposite side can directly jump off the switch of the side by the remote jump; if the local side is thrown in the starting control word, the local side has certain current amount to start the local side protection and then trips except that the remote jump command of the opposite side is received.
The backup power automatic switching device 50 is used for fault position judgment and locking backup power automatic switching, the fault position judgment comprises receiving a tap signal 'TWJ 2' of the second switch 2DL, receiving a voltage signal of a first voltage detection device TYD1 (namely, detecting whether the first voltage detection device TYD1 of the main supply line has voltage), if so, the fault occurs in a bus area, and switching a locking reclosing control word to the weak feed side protection device 40 and locking the backup power automatic switching (switching on and off through a constant value control word).
Illustratively, the protection principle of the power system for preventing the backup power automatic switch from being switched on the fault bus is as follows:
during normal operation, the switches (the first switch 1DL and the second switch 2 DL) on the two sides of the main supply line are switched on to supply power to the weak feed side station bus, the switch (the third switch 3 DL) on one side of the standby line is switched on, the switch (the fourth switch 4 DL) on the other side of the standby line is switched off (in a hot standby state), and the spare power automatic switching device 50 is fully charged after meeting the charging condition.
When a fault occurs, judging whether the fault of the power system is a bus area fault; the bus area fault belongs to a line protection area external fault (non-line area fault), such as a bus fault, a bus disconnecting link fault or a malignant misoperation. If the bus region has failed, the main protection of the power source side protection device 30 does not operate, and the backup protection (distance second stage, zero sequence second stage) operates. In the first time limit, the power supply side protection device 30 sends a far jump command to the weak feed side protection device 40 through the fiber channel. The weak feeder side protection device 40 receives the far jump command, switches the far jump not via the control word started by the side, controls the second switch 2DL to jump off, and switches off the far jump as a signal to the backup power automatic switching device 50. The second switch 2DL is tripped off, and a switch dividing signal is switched into the spare power automatic switching device 50; meanwhile, the backup protection of the power source side protection device 30 returns to the second time limit, and the first switch 1DL is kept in the on state. The spare power automatic switching device 50 receives the far jump signal, the switch position division signal and the voltage signal of the first voltage detection device TYD1, and judges whether the main supply line has voltage or not; if the voltage is present, the fault occurs in the bus area, and the backup automatic switching device 50 controls the weak feed side protection device 40 to lock reclosing and lock backup automatic switching.
Therefore, in the embodiment of the invention, when the main protection does not act, the backup protection action is used for preliminarily judging that the fault is not in the line protection area, the optical fiber channel and the long jump function configured by the line are further fully utilized, the long jump weak feeder side switch is firstly backed up in the first time limit, and the bus area is isolated from the line area; and in a short time window that a switch on the power supply side (the local side) is not disconnected, whether the first voltage detection device TYD1 of the main power supply line has voltage or not is quickly detected, so that whether the fault occurs on the line side of the disconnected switch or the bus side is finally determined, and therefore enough evidence can be provided for locking the spare power automatic switch or locking the reclosing. The embodiment of the invention can accurately and reliably judge that the fault occurs in the non-line area (between the circuit breakers at two sides of the main supply line). As long as a fault occurs in a non-line area, such as a bus, embodiments of the present invention can control the preparation of the automatic switching device to be inoperative. Specifically, when the fault point is judged to be in the non-line area, the locking spare power automatic switching device can be switched off, and the locking reclosing device can also be switched off. However, in the prior art, when a fault occurs on a bus, a first impact is caused, a circuit reclose causes a second impact, and a backup power automatic switching action is applied to the fault bus, so that a third impact is caused. According to the embodiment of the invention, after the fault is accurately and reliably judged to be located in the bus, the reclosing and the spare power automatic switching are locked, and the secondary impact and the third impact are avoided, so that the heavy loss and the consequence caused by the fact that the spare power automatic switching is mistakenly combined with the fault bus are avoided. In addition, the beneficial effects can be realized only by very simple setting and modification on the original equipment and the original loop, and the method is very easy to popularize and has considerable effects.
On the basis of the above technical solutions, optionally, there are multiple types of the weak feed side bus 20, and the present invention is not limited thereto, for example, the weak feed side bus 20 is a GIS bus, and by using the implementation manner for preventing the backup power automatic switching on from occurring at the faulty bus provided in the embodiment of the present invention, the secondary impact and the third impact that continue to occur after the GIS bus has a fault can be avoided, so that the significant loss and consequence caused by the backup power automatic switching on the faulty bus are avoided.
Example two
The embodiment of the invention provides a control method for a power system for preventing a spare power automatic switching switch from being switched on a fault bus. The control method can be applied to the power system for preventing the backup power automatic switch from being switched on the fault bus provided by any embodiment of the invention. The control method comprises the following steps:
The bus area fault belongs to a line protection area external fault (non-line area fault), such as a bus fault, a bus disconnecting link fault or a malignant misoperation. The weak feed side protection device comprises incoming line protection of a main supply line and a standby line. Only when the remote jump is thrown without starting the control word at the side, the opposite side can directly jump off the switch at the side through the remote jump; if the local side is thrown in the starting control word, the local side has certain current amount to start the local side protection and then trips except that the remote jump command of the opposite side is received.
And 2, the weak feed side protection device receives a far jump command, switches a control word of which the far jump is not started by the weak feed side, controls the second switch to be switched off, and switches a far jump signal to the spare power automatic switching device.
Step 3, tripping off the second switch, and switching on a switch position division signal to the spare power automatic switching device; meanwhile, the backup protection of the power supply side protection device returns in a second time limit, the first switch is kept in a closed state, and the line has voltage.
And 4, receiving the far jump signal, the switch position division signal and the voltage signal of the first voltage detection device by the spare power automatic switching device, and judging whether the main supply line has voltage or not.
And 5, if the voltage is available, the fault occurs in a bus area, and the spare power automatic switching device controls the weak feed side protection device to lock reclosing and lock the spare power automatic switching.
The embodiment of the invention adds a new control logic on the basis of the original control logic of the spare power automatic switching device, preliminarily judges that the fault is not in a line protection area by using a backup protection action under the condition that a main protection is not operated, further fully utilizes a long jump function configured by a line, backs up a first time limit, and firstly jumps a weak feeder side switch far to isolate a bus area from the line area; and in a short time window that a switch on the power supply side (the local side) is not disconnected, whether the first voltage detection device of the main power supply line has voltage or not is quickly detected, so that whether the fault occurs on the line side of the disconnected switch or the bus side is finally determined, and therefore enough evidence can be provided for locking the spare power automatic switching device or locking the reclosing device. The embodiment of the invention can accurately and reliably judge that the fault occurs in the non-line area (between the circuit breakers at two sides of the main supply line). As long as the fault occurs in a non-line area, such as a bus, the embodiment of the invention can control the automatic switching to be not operated. Specifically, when the fault point is judged to be in the non-line area, the locking spare power automatic switching device can be switched off, and the locking reclosing device can also be switched off. However, in the prior art, when a fault occurs on a bus, a first impact is caused, a circuit reclose causes a second impact, and a backup power automatic switching action is applied to the fault bus, so that a third impact is caused. The embodiment of the invention adds a new control logic, and after accurately and reliably judging that the fault is positioned on the bus, the reclosing and the spare power automatic switching are locked, so that the second impact and the third impact are avoided, and the serious loss and the consequence caused by the fault of the spare power automatic switching on the fault bus are avoided.
On the basis of the above technical solution, optionally, the control method further includes a control logic when the power system fault is a non-bus area fault, and the specific steps are as follows:
and 6, if the power system fault is a non-bus area fault, performing main protection action of the power supply side protection device, tripping off switches (a first switch and a second switch) on two sides of a main supply line, and reclosing.
And 7, if the fault is a permanent fault, switching on the reclosure to accelerate tripping after the fault, and losing voltage of the weak feedback side bus.
Step 8, the spare power automatic switching device receives a voltage signal of the first voltage detection device and detects that the weak feedback side bus is in voltage loss; the backup automatic switching device receives a voltage signal of the second voltage detection device, detects that the standby line has action conditions such as voltage and the like and the time limit is reached; an action outlet, which is used for tripping off a switch (a second switch) at the side of the main supply circuit; and if a split position open-in signal TWJ2 of the second switch is received (the fault is confirmed to be isolated) and no latch such as 'current latch exists' is opened (the standby line input condition is met), closing a standby line switch (a fourth switch) and continuously supplying power to the voltage-loss weak feed side bus.
On the basis of the above technical solution, optionally, the determining whether the main supply line has pressure includes: and judging whether the voltage signal is greater than a voltage threshold value Uz or not. Wherein, the pressure threshold value Uz can be adjusted to meet the actual requirement.
It is to be noted that the foregoing description is only exemplary of the invention and that the principles of the technology may be employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in some detail by the above embodiments, the invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the invention, and the scope of the invention is determined by the scope of the appended claims.
Claims (9)
1. An electric power system for preventing a backup power automatic switching from being switched on a fault bus is characterized by comprising:
a power supply side bus and a weak feed side bus;
the main supply circuit is connected between the power supply side bus and the weak feed side bus and comprises a first switch and a second switch which are connected in series, the first switch is a power supply side switch, and the second switch is a weak feed side switch;
the standby circuit is connected with the main supply circuit in parallel and comprises a third switch and a fourth switch which are connected in series, the third switch is a power supply side switch, and the fourth switch is a weak feed side switch;
the first voltage detection device is connected to the main supply line and is used for detecting the voltage of the weak feed side of the main supply line;
the second voltage detection device is connected to the standby circuit and is used for detecting the voltage of the weak feed side of the standby circuit;
the third voltage detection device is connected to the weak feed side bus and used for detecting the voltage of the weak feed side bus;
the system comprises a power supply side protection device, a weak feed side protection device and a spare power automatic switching device, wherein the power supply side protection device is connected with the weak feed side protection device, and the weak feed side protection device is connected with the spare power automatic switching device; the power supply side protection device, the weak feed side protection device and the spare power automatic switching device are used for protecting the power system and preventing the spare power automatic switching from being switched on a fault bus;
the power supply side protection device is used for providing main protection and backup protection, the backup protection comprises a first time limit and a second time limit, and a long jump command is sent to the weak feed side in the first time limit; controlling the backup protection to trip the power supply side switch in the second time limit;
the weak feed side protection device is used for providing incoming line protection, the incoming line protection comprises a first control mode and a second control mode, and the first control mode is that a remote jump is thrown without starting a control word at the side; the second control mode is to send a far jump signal to the spare power automatic switching device;
the spare power automatic switching device is used for judging a fault position and locking the spare power automatic switching, the judging of the fault position comprises receiving a branch signal of the second switch and receiving a voltage signal of the first voltage detection device, if the voltage signal is provided, the fault occurs in a bus area, and a locking reclosing control word is sent to the weak feed side protection device and the spare power automatic switching is locked.
2. The power system for preventing the backup power automatic switch from being switched on the fault bus according to claim 1, wherein the power system is configured with optical fiber current differential protection, and the power supply side protection device is connected with the weak feed side protection device through an optical fiber channel.
3. The power system for preventing the backup power automatic switch from being switched on the fault bus according to claim 1, wherein the weak feed side bus is a GIS bus.
4. The power system for preventing the backup power automatic switch from being switched on the fault bus according to claim 1, wherein the first switch, the second switch, the third switch and the fourth switch are all circuit breakers.
5. The power system for preventing the backup power automatic switch from being switched on the fault bus according to claim 1, wherein the first voltage detection device, the second voltage detection device and the third voltage detection device are all voltage transformers.
6. A control method of an electric power system for preventing the spare power automatic switching from being switched on a fault bus according to any one of claims 1 to 5, characterized by comprising the following steps:
if the fault of the power system is a bus area fault, the main protection of the power supply side protection device does not act, and the backup protection acts;
in a first time limit, the power supply side protection device sends a far jump command to the weak feed side protection device;
the weak feed side protection device receives the far jump command, throws a control word that the far jump does not pass through the start of the side, controls the second switch to trip off, and sends a far jump as a signal to the spare power automatic switching device;
the second switch is tripped off, and a switch position division signal is switched into the spare power automatic switching device; meanwhile, a second time limit of backup protection of the power supply side protection device returns, and the first switch is kept in a closed state;
the spare power automatic switching device receives the far jump signal, the switch position division signal and the voltage signal of the first voltage detection device and judges whether the main supply line has voltage or not;
if the voltage is present, the fault occurs in a bus area, and the spare power automatic switching device controls the weak feed side protection device to lock reclosing and lock spare power automatic switching.
7. The control method for preventing the backup power automatic switching from being switched on the power system of the fault bus according to claim 6, further comprising:
if the power system fault is a non-bus area fault, the main protection action of the power supply side protection device trips the first switch and the second switch, and then the switch is closed again;
if the fault is a permanent fault, reclosing is combined with accelerated tripping after the fault, and the weak feedback side bus is in voltage loss;
the spare power automatic switching device receives a voltage signal of the first voltage detection device and detects that the weak feed side bus is in voltage loss; the backup power automatic switching device receives a voltage signal of the second voltage detection device, detects that the backup line has voltage and reaches a time limit;
an action outlet for tripping the second switch;
and if the standby line input condition is met, closing the fourth switch.
8. The control method for preventing the backup power automatic switch from being switched on the power system of the fault bus according to claim 6, wherein the bus area fault comprises: bus fault, bus disconnecting link fault or malignant misoperation.
9. The method for controlling the power system for preventing the backup power automatic switching from being switched on the fault bus according to claim 6, wherein the step of judging whether the main supply line has voltage comprises the following steps:
and judging whether the voltage signal is greater than a voltage threshold value or not.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011487685.9A CN112582989B (en) | 2020-12-16 | 2020-12-16 | Power system for preventing backup power automatic switching on and switching off of fault bus and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011487685.9A CN112582989B (en) | 2020-12-16 | 2020-12-16 | Power system for preventing backup power automatic switching on and switching off of fault bus and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112582989A CN112582989A (en) | 2021-03-30 |
| CN112582989B true CN112582989B (en) | 2023-02-10 |
Family
ID=75135480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011487685.9A Active CN112582989B (en) | 2020-12-16 | 2020-12-16 | Power system for preventing backup power automatic switching on and switching off of fault bus and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112582989B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101369739A (en) * | 2008-09-28 | 2009-02-18 | 上海宝钢化工有限公司 | Spare power automatic switching device and method for three-segment bus two-segment switch |
| JP2010161865A (en) * | 2009-01-07 | 2010-07-22 | Chugoku Electric Power Co Inc:The | System and method for protecting ground of distribution system and program |
| CN202142905U (en) * | 2011-05-25 | 2012-02-08 | 广东电网公司深圳供电局 | Logic device for shutting mistaken switching of spare power source automatic switch device of power supply |
| CN102768327A (en) * | 2012-07-13 | 2012-11-07 | 深圳供电局有限公司 | Method and spare power automatic switching device for detecting faults on basis of GPS (global positioning system) synchronous phase differential method |
| CN104836211A (en) * | 2014-12-30 | 2015-08-12 | 国网浙江海盐县供电公司 | Bus fault locking system and locking method |
| CN108051706A (en) * | 2017-12-28 | 2018-05-18 | 长园深瑞继保自动化有限公司 | Automatic throw-in equipment of emergency power supply fault recognition method and system |
| CN109149570A (en) * | 2018-09-20 | 2019-01-04 | 国网江苏省电力有限公司镇江供电分公司 | Interior bridge and single-trunk segmental wiring transformer substation spare power automatic switching simplify relay protecting method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104539043B (en) * | 2015-01-22 | 2017-03-08 | 江苏省电力公司扬州供电公司 | A kind of automatic switching device of standby power supply system haul oneself willingly into method |
-
2020
- 2020-12-16 CN CN202011487685.9A patent/CN112582989B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101369739A (en) * | 2008-09-28 | 2009-02-18 | 上海宝钢化工有限公司 | Spare power automatic switching device and method for three-segment bus two-segment switch |
| JP2010161865A (en) * | 2009-01-07 | 2010-07-22 | Chugoku Electric Power Co Inc:The | System and method for protecting ground of distribution system and program |
| CN202142905U (en) * | 2011-05-25 | 2012-02-08 | 广东电网公司深圳供电局 | Logic device for shutting mistaken switching of spare power source automatic switch device of power supply |
| CN102768327A (en) * | 2012-07-13 | 2012-11-07 | 深圳供电局有限公司 | Method and spare power automatic switching device for detecting faults on basis of GPS (global positioning system) synchronous phase differential method |
| CN104836211A (en) * | 2014-12-30 | 2015-08-12 | 国网浙江海盐县供电公司 | Bus fault locking system and locking method |
| CN108051706A (en) * | 2017-12-28 | 2018-05-18 | 长园深瑞继保自动化有限公司 | Automatic throw-in equipment of emergency power supply fault recognition method and system |
| CN109149570A (en) * | 2018-09-20 | 2019-01-04 | 国网江苏省电力有限公司镇江供电分公司 | Interior bridge and single-trunk segmental wiring transformer substation spare power automatic switching simplify relay protecting method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112582989A (en) | 2021-03-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR102230508B1 (en) | A method of controlling a facility so that DC current is transmitted to the network during network protection from short circuit faults | |
| CN108565974B (en) | Self-powered remote failure protection method and system based on protection device | |
| CN110350651B (en) | Spare power automatic switching misoperation prevention method for 110kV single bus faults | |
| CN111463756B (en) | Protection locking joint optimization method based on high-service bus protection and fast switching device | |
| CN112909903B (en) | High-voltage plant grounding protection and quick switching device protection starting combined optimization method | |
| CN113258545B (en) | In-situ feeder automation method and system based on multi-stage time step difference protection | |
| CN111668922A (en) | 10kV spare power automatic switching action method for transformer substation | |
| CN109245101B (en) | Method for improving power supply reliability of series-supply transformer substation | |
| CN201549868U (en) | Low-voltage switch intelligent controller | |
| CN102593798A (en) | Comprehensive relay protection method applied to intelligent switch | |
| KR101609896B1 (en) | Automatic load transfer relay for distribution transformer | |
| CN112582989B (en) | Power system for preventing backup power automatic switching on and switching off of fault bus and control method thereof | |
| CN105514948A (en) | Backup automatic switching (BZT) apparatus breaker breakdown detection method and BZT apparatus | |
| CN109193583B (en) | Control circuit for self-adaptive switching of inner bridge connection short lead protection | |
| CN110970876A (en) | Feeder automation fault isolation method and device | |
| CN110707658A (en) | AC line reclosing method and system for preventing DC continuous commutation failure | |
| CN114062973B (en) | In-situ feeder automation reverse locking application method | |
| CN114142446B (en) | Method for preventing intelligent distributed system from being abnormal | |
| JPH06269121A (en) | Service-interruption minimization system and operating method for distribution line | |
| Roberts et al. | Trip and restore distribution circuits at transmission speeds | |
| CN110870154A (en) | Power conditioner, power system, and reactive power suppression method for power system | |
| JP3169976B2 (en) | Distribution line ground fault protection system | |
| CN110932244A (en) | Relay protection method for no-switching of all-station protection outlet pressure plates of transformer substation | |
| CN117394307A (en) | Regional spare power automatic switching control method and system based on remote transmission mode | |
| CN114512967B (en) | Distribution network protection and automation device and precise and rapid ring opening and closing method for distribution network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |