CN112701772B - Spare power automatic switching method and device for 500kV charging circuit - Google Patents
Spare power automatic switching method and device for 500kV charging circuit Download PDFInfo
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- CN112701772B CN112701772B CN202011415352.5A CN202011415352A CN112701772B CN 112701772 B CN112701772 B CN 112701772B CN 202011415352 A CN202011415352 A CN 202011415352A CN 112701772 B CN112701772 B CN 112701772B
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- 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
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- 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)
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a backup power automatic switching method for a 500kV charging circuit, which is used for a same-tower double-circuit 500kV circuit comprising a first line and a second line and comprises the following steps: detecting the on-off states of a preset switch and a preset circuit disconnecting link corresponding to the line A and the line B respectively, and determining a normal operation circuit and a charging operation circuit in the line A and the line B; if the normal operation line is in the open state corresponding to the preset switch and the flowing current is smaller than a first preset value, the normal operation line is determined to be tripped, and after protection is not performed, the charging operation line is in the open state corresponding to the preset switch; and if the charging operation line corresponds to the preset switch and is in the opening state and the flowing current is smaller than a second preset value, enabling the knife switch of the preset line on the charging operation line to be in the closing state, and enabling the charging operation line to be in the closing state again corresponding to the opened preset switch, so that the charging operation line can automatically change from the hot standby state to the normal operation state. By implementing the invention, the standby line can be put into normal operation quickly, the operation is simple, and time and labor are saved.
Description
Technical Field
The invention relates to the technical field of spare power automatic switching of power grid lines, in particular to a method and a device for spare power automatic switching of a 500kV charging line.
Background
With the improvement of power supply reliability, the application of the spare power automatic switching device is wider and wider, especially in an urban power grid. In order to reduce the short-circuit current of a 500kV power grid, one-circuit of a same-tower double-circuit 500kV line is often converted into charging operation to improve the line impedance, so that the problem that the short-circuit current exceeds the standard is solved.
However, when the original double-circuit line only runs normally, the 500kV grid net rack is seriously weakened, which causes a large number of section overload problems, especially when the running line fails, the charging line cannot automatically run normally from the hot standby mode.
In order to solve the problems, a dispatcher is often required to instruct substation operators to perform complex switching operation, and the time consumption is long (more than half an hour is expected), so that a serious operation risk exists in a power grid during operation. Therefore, a backup power automatic switching method for a 500kV charging line is needed to be provided, which changes the traditional accident handling mode of the original dispatcher to realize that the backup line is put into normal operation quickly, and has the advantages of simple operation, time saving and labor saving.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a backup automatic switching method and a backup automatic switching device for a 500kV charging line, which can quickly switch a backup line into normal operation, are simple to operate, and are time-saving and labor-saving.
In order to solve the technical problem, an embodiment of the present invention provides a backup power automatic switching method for a 500kV charging line, which is used for a same-tower double-circuit 500kV line including a first line and a second line, and includes the following steps:
s1, detecting the on-off states of a preset switch and a preset circuit disconnecting link corresponding to the line A and the line B respectively, and determining that one of the line A and the line B corresponds to a normal operation circuit and the other line corresponds to a charging operation circuit according to a detection result; the switching-on/off state is a switching-on state or a switching-off state;
s2, if the preset switch corresponding to the normal operation line is judged to be in a brake-off state and the flowing current is smaller than a first preset value, the normal operation line is judged to be tripped, and further the preset switch corresponding to the charging operation line is in the brake-off state after the fact that protection is not mistakenly operated is determined;
and S3, if the preset switch corresponding to the charging operation line is judged to be in a switching-off state and the flowing current is smaller than a second preset value, enabling the preset line knife switch on the charging operation line to be in a switching-on state, and further enabling the preset switch corresponding to the switched-off state of the charging operation line to be in a switching-on state again so as to realize that the charging operation line automatically changes from a hot standby state to a normal operation state.
Wherein, the step S1 specifically includes:
if the preset switch and the preset line disconnecting link corresponding to the line A are both in a switching-on state, and the preset switch corresponding to the line B is in a switching-on state and the preset line disconnecting link is in a switching-off state, determining that the line A is the normal operation line and the line B is the charging operation line;
on the contrary, if the preset switch corresponding to the first line is in a closing state and the preset line disconnecting link is in an opening state, and the preset switch corresponding to the second line and the preset line disconnecting link are both in a closing state, it is determined that the first line is the charging operation line, and the second line is the normal operation line.
In step S2, the protection non-malfunction is determined based on the recognition that the 500kV female differential locking signal is not generated in the preset protection device.
Wherein the method further comprises:
after the protection is determined not to have the false action, the preset switch corresponding to the charging operation circuit is in the opening state after a certain time delay.
Wherein the first predetermined value and the second predetermined value are both 0.
The embodiment of the invention also provides a spare power automatic switching device for a 500kV charging line, which is used for a same-tower double-circuit 500kV line comprising a first line and a second line, and comprises the following components:
the circuit distinguishing unit is used for detecting the on-off states of the preset switches and the preset circuit disconnecting links corresponding to the line A and the line B respectively, and determining one of the line A and the line B as a normal operation circuit and the other as a charging operation circuit according to the detection result; the switching-on/off state is a switching-on state or a switching-off state;
the normal operation line trip recognition unit is used for determining that the normal operation line is tripped if the preset switch corresponding to the normal operation line is judged to be in the open state and the flowing current is smaller than a first preset value, and further enabling the preset switch corresponding to the charging operation line to be in the open state after the protection is determined not to be mistakenly operated;
and the charging operation line spare power automatic switching unit is used for enabling a preset line disconnecting link on the charging operation line to be in a switching-on state if the preset switch corresponding to the charging operation line is judged to be in the switching-off state and the flowing current is smaller than a second preset value, and further enabling the preset switch corresponding to the switched-off state of the charging operation line to be in the switching-on state again so as to realize that the charging operation line automatically changes from a hot standby state to a normal operation state.
Wherein the line distinguishing unit includes:
the first distinguishing module is used for determining that the first line is the normal operation line and the second line is the charging operation line if the preset switch corresponding to the first line and the preset line disconnecting link are both in a closing state, the preset switch corresponding to the second line is in a closing state and the preset line disconnecting link is in a disconnecting state;
the second distinguishing module is configured to determine that the first line is the charging operation line and the second line is the normal operation line if the preset switch corresponding to the first line is in a switching-on state and the preset line switch is in a switching-off state, and the preset switch corresponding to the second line and the preset line switch are both in a switching-on state.
Wherein the first predetermined value and the second predetermined value are both 0.
The embodiment of the invention has the following beneficial effects:
according to the invention, the normal operation circuit and the charging operation circuit are determined by identifying the on-off states of the preset switches and the preset circuit disconnecting links on the circuits of the same-tower double-circuit 500kV circuit, and after the normal operation circuit is tripped, the charging operation circuit is automatically switched from the hot standby to the normal operation by simply switching on and off the preset switches and the preset circuit disconnecting links on the charging operation circuit, so that the standby circuit can be quickly switched into the normal operation, and the circuit is simple to operate, and is time-saving and labor-saving.
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 embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive labor.
Fig. 1 is a flowchart of a backup power automatic switching method for a 500kV charging line according to an embodiment of the present invention;
fig. 2 is a schematic connection diagram of a 500kV line with double circuits on the same tower in an application scenario of a backup automatic switching method for a 500kV charging line provided in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a 500kV charging line backup automatic switching device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, in an embodiment of the present invention, a 500kV charging line backup power automatic switching method is provided, and is used for a same-tower double-circuit 500kV line including a first line and a second line, where the method includes the following steps:
s1, detecting the on-off states of a preset switch and a preset circuit disconnecting link corresponding to the line A and the line B respectively, and determining that one line corresponds to a normal operation line and the other line corresponds to a charging operation line in the line A and the line B according to a detection result; the switching-on/off state is a switching-on state or a switching-off state;
the method comprises the specific processes that if a preset switch and a preset line disconnecting link corresponding to a first line are both in a switching-on state, and a preset switch corresponding to a second line is in a switching-on state and a preset line disconnecting link is in a switching-off state, the first line is determined to be a normal operation line, and the second line is determined to be a charging operation line;
on the contrary, if the preset switch corresponding to the first line is in a closing state and the preset line switch is in a breaking state, and the preset switch corresponding to the second line and the preset line switch are both in a closing state, it is determined that the first line is a charging operation line and the second line is a normal operation line.
It should be noted that the preset switches corresponding to the first line a and the second line b are all adjacent circuit-breaking switches on the power supply line supplying power to the preset switches.
S2, if the preset switch corresponding to the normal operation line is judged to be in a brake-off state and the flowing current is smaller than a first preset value, the normal operation line is judged to be tripped, and further the preset switch corresponding to the charging operation line is in the brake-off state after the fact that protection is not mistakenly operated is determined;
the specific process is that if the preset switch corresponding to the normal operation line is judged to be in the open brake state and the flowing current is smaller than a first preset value (such as 0), the normal operation line is judged to be tripped, and after the protection is determined not to be in the false action, the preset switch corresponding to the charging operation line needs to be in the open brake state after a certain time delay. The protection non-misoperation is determined based on the fact that the preset protection device does not generate a 500kV female differential locking signal, namely if the 500kV female differential locking signal does not exist, the preset protection device protects normal action.
It should be noted that, if there are at least two or more power supply lines, the corresponding preset switches need to be in the open state sequentially.
And S3, if the preset switch corresponding to the charging operation line is judged to be in a switching-off state and the flowing current is smaller than a second preset value, enabling the preset line knife switch on the charging operation line to be in a switching-on state, and further enabling the preset switch corresponding to the switched-off state of the charging operation line to be in a switching-on state again so as to realize that the charging operation line automatically changes from a hot standby state to a normal operation state.
Specifically, in order to prevent the on-load disconnecting link from being closed, it is determined whether a preset switch corresponding to the charging operation line is in a disconnecting state and whether the flowing current is smaller than a second predetermined value (e.g., 0). Therefore, when the preset switch corresponding to the charging operation line is determined to be in the opening state and the flowing current is smaller than a second preset value (such as 0), the preset line knife switch on the charging operation line is in the closing state, and then the preset switch corresponding to the opened preset switch on the charging operation line is in the closing state again, so that the charging operation line automatically changes from the hot standby to the normal operation.
As shown in fig. 2, an application scenario of the backup power automatic switching method for a 500kV charging line in the embodiment of the present invention is further described:
in a 2/3 main wiring diagram 2 generally adopted by 500kV equipment, a switch in 5012 and a switch at 5013 side on a power supply line adjacent to a line A are both preset switches and are in a closing state, and a preset line disconnecting link 50136 on the line A is also in the closing state. Thus, the first line is a normal operating line. Meanwhile, switches 5022 and 5021 side switches on a power supply circuit adjacent to the second line are both preset switches and are in a closing state, and a preset circuit knife switch 50236 on the second line is also in a breaking state. Therefore, the B line is a charging operation line, namely a hot standby line.
First, it is determined whether the first line corresponds to the switch 5012 and the switch 5013 and whether the current flowing when both the switch 5012 and the switch 5013 are in the open state is 0 or not. If the switch 5012 and the switch 5013 are both in the open state and the current flowing through the switch is 0, it indicates that the first line is tripped, and the backup power automatic switching function can be started.
Then, whether a 500kV female differential motion is used as a locking signal is judged to judge whether the protection is in misoperation. If no 500kV female differential motion is used as a locking signal, the switch in 5022 and the switch at the 5021 side corresponding to the charging operation circuit are in an opening state sequentially after a certain time delay.
Then, to prevent the on-load switching, it is determined that both the switch 5022 and the switch 5021 are in the open state, and the current flowing through them is 0. If both the switch 5022 and the switch 5021 are in the open state and the current flowing through them is 0, the circuit switch 50216 is turned on, so that the circuit switch 50216 is in the closed state.
And finally, the switch in 5022 and the switch at 5021 side are switched on, so that the switch in 5022 and the switch at 5021 side are in a switched-on state again, and the second line automatically switches from a hot standby state to a normal operation state, namely the first line is connected to operate.
As shown in fig. 3, in an embodiment of the present invention, a 500kV charging line backup automatic switching device is provided, which is used for a same-tower double-circuit 500kV line including a first line and a second line, and includes:
the circuit distinguishing unit 110 is configured to detect an on-off state of a preset switch and a preset circuit disconnecting link corresponding to each of the first line a and the second line b, and determine, according to a detection result, that one of the first line a and the second line b corresponds to a normal operating circuit and the other corresponds to a charging operating circuit; the switching-on/off state is a switching-on state or a switching-off state;
a normal operation line trip recognition unit 120, configured to determine that the normal operation line has tripped if it is determined that the preset switch corresponding to the normal operation line is in a trip-off state and a flowing current is smaller than a first predetermined value, and further, after it is determined that no malfunction occurs in protection, make the preset switch corresponding to the charging operation line in a trip-off state;
the charging operation line backup automatic switching unit 130 is configured to, if it is determined that the preset switch corresponding to the charging operation line is in a switching-off state and the flowing current is smaller than a second predetermined value, enable the preset line disconnecting link on the charging operation line to be in a switching-on state, and further enable the preset switch corresponding to the switching-off state of the charging operation line to be in a switching-on state again, so as to implement that the charging operation line automatically changes from a hot standby state to a normal operation state.
Wherein the line distinguishing unit includes:
a first distinguishing module, configured to determine that the first line is the normal operation line and the second line is the charging operation line if the preset switch corresponding to the first line and the preset line switch are both in a closing state, and the preset switch corresponding to the second line is in a closing state and the preset line switch is in an opening state;
the second distinguishing module is configured to determine that the first line is the charging operation line and the second line is the normal operation line if the preset switch corresponding to the first line is in a switching-on state and the preset line switch is in a switching-off state, and the preset switch corresponding to the second line and the preset line switch are both in a switching-on state.
Wherein the first predetermined value and the second predetermined value are both 0.
The embodiment of the invention has the following beneficial effects:
according to the invention, the normal operation circuit and the charging operation circuit are determined by identifying the on-off state of the preset switch and the preset circuit disconnecting link on each circuit on the same-tower double-circuit 500kV circuit, and after the normal operation circuit is tripped, the charging operation circuit is automatically switched from the hot standby to the normal operation by simply switching on and off the preset switch and the preset circuit disconnecting link on the charging operation circuit, so that the standby circuit can be quickly put into the normal operation, and the operation is simple, time and labor are saved.
It should be noted that, in the above device embodiment, each included unit is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be achieved; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (8)
1. A spare power automatic switching method of a 500kV charging line is used for a same-tower double-circuit 500kV line comprising a first line and a second line, and is characterized by comprising the following steps:
s1, detecting the on-off states of a preset switch and a preset circuit disconnecting link corresponding to the line A and the line B respectively, and determining that one of the line A and the line B corresponds to a normal operation circuit and the other line corresponds to a charging operation circuit according to a detection result; the switching-on/off state is a switching-on state or a switching-off state;
s2, if the preset switch corresponding to the normal operation line is in a brake-off state and the flowing current is smaller than a first preset value, the normal operation line is determined to be tripped, and further after the fact that protection is not mistakenly operated is determined, the preset switch corresponding to the charging operation line is in a brake-off state;
and S3, if the preset switch corresponding to the charging operation line is judged to be in a switching-off state and the flowing current is smaller than a second preset value, enabling the preset line knife switch on the charging operation line to be in a switching-on state, and further enabling the preset switch corresponding to the switched-off state of the charging operation line to be in a switching-on state again so as to realize that the charging operation line automatically changes from a hot standby state to a normal operation state.
2. The spare power automatic switching method for the 500kV charging line according to claim 1, wherein the step S1 specifically comprises:
if the preset switch and the preset line disconnecting link corresponding to the line A are both in a switching-on state, and the preset switch corresponding to the line B is in a switching-on state and the preset line disconnecting link is in a switching-off state, determining that the line A is the normal operation line and the line B is the charging operation line;
on the contrary, if the preset switch corresponding to the first line is in a closing state and the preset line disconnecting link is in an opening state, and the preset switch corresponding to the second line and the preset line disconnecting link are both in a closing state, it is determined that the first line is the charging operation line, and the second line is the normal operation line.
3. The method for standby power automatic switching on the 500kV charging line according to claim 1, wherein in the step S2, the protection non-misoperation is determined based on the recognition that the 500kV female differential motion locking signal is not generated in the preset protection device.
4. The 500kV charging line backup power automatic switching method according to claim 3, characterized in that the method further comprises:
after the protection is determined not to have the false action, the preset switch corresponding to the charging operation circuit is in the opening state after a certain time delay.
5. The 500kV charging line backup power automatic switching method according to claim 1, wherein the first predetermined value and the second predetermined value are both 0.
6. The utility model provides a 500kV charging circuit spare power automatic switching device for on the same tower double circuit 500kV circuit including first line and second line, its characterized in that includes:
the circuit distinguishing unit is used for detecting the on-off states of the preset switches and the preset circuit disconnecting links corresponding to the line A and the line B respectively, and determining one of the line A and the line B as a normal operation circuit and the other as a charging operation circuit according to the detection result; the switching-on/off state is a switching-on state or a switching-off state;
the normal operation line trip recognition unit is used for determining that the normal operation line is tripped if the preset switch corresponding to the normal operation line is judged to be in the open state and the flowing current is smaller than a first preset value, and further enabling the preset switch corresponding to the charging operation line to be in the open state after the protection is determined not to be mistakenly operated;
and the charging operation line spare power automatic switching unit is used for enabling a preset line disconnecting link on the charging operation line to be in a switching-on state if the preset switch corresponding to the charging operation line is judged to be in the switching-off state and the flowing current is smaller than a second preset value, and further enabling the preset switch corresponding to the switched-off state of the charging operation line to be in the switching-on state again so as to realize that the charging operation line automatically changes from a hot standby state to a normal operation state.
7. The 500kV charging line automatic backup power switching device according to claim 6, wherein said line distinguishing unit comprises:
a first distinguishing module, configured to determine that the first line is the normal operation line and the second line is the charging operation line if the preset switch corresponding to the first line and the preset line switch are both in a closing state, and the preset switch corresponding to the second line is in a closing state and the preset line switch is in an opening state;
the second distinguishing module is configured to determine that the first line is the charging operation line and the second line is the normal operation line if the preset switch corresponding to the first line is in a switching-on state and the preset line switch is in a switching-off state, and the preset switch corresponding to the second line and the preset line switch are both in a switching-on state.
8. The 500kV charging line backup automatic switching device according to claim 6, wherein the first predetermined value and the second predetermined value are both 0.
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| CN202011415352.5A CN112701772B (en) | 2020-12-07 | 2020-12-07 | Spare power automatic switching method and device for 500kV charging circuit |
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| CN202011415352.5A CN112701772B (en) | 2020-12-07 | 2020-12-07 | Spare power automatic switching method and device for 500kV charging circuit |
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| CN112701772B true CN112701772B (en) | 2023-04-18 |
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| CN111431181A (en) * | 2020-04-27 | 2020-07-17 | 深圳供电局有限公司 | Control method and device for spare power automatic switching in power system and spare power automatic switching of power system |
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