CN114649810B - A main distribution network intelligent linkage system and a method for realizing full stop and full rotation in case of failure - Google Patents

Abstract

The invention discloses a main distribution network intelligent linkage system and a fault full stop full rotation realization method, comprising the following steps: the intelligent linkage device is connected with the bus and used for collecting bus signals, performing charge and discharge operations and judging whether the bus fails or not; and the scheduling module is connected with the intelligent linkage device and used for executing load transfer and/or reversing operation according to the data provided by the intelligent linkage device. The method is used for intelligently identifying the fault type, calculating the load quantity to be transferred in real time when the transformer substation is completely stopped due to the main network fault or the 10kV bus in the transformer substation loses power and the spare power automatic switching failure occurs, combining the limit of the delivery channel, accurately switching and delivering the load in the whole network range, and reducing the fault recovery time.

Description

A main distribution network intelligent linkage system and a method for realizing full stop and full rotation in case of failure

Technical Field

The present invention relates to the field of power grid fault processing, and in particular to a main distribution network intelligent linkage system and a method for achieving full stop and full rotation due to a fault.

Background Art

With the rapid development of local economy and urban and rural construction, the risk of power grid is increasing day by day, and the number of six-level risk warning orders of power grid has increased greatly throughout the year. The measures taken by traditional substations to prevent power grid risks from being shut down often adopt strengthening equipment inspections. The technical measures on the 10kV side remain at the use of automatic standby in the station. Once the substation is shut down or the automatic standby fails, the distribution network needs to manually reverse the load to restore the 10kV bus voltage, and emergency disposal usually takes a long time. The reason for the insufficiency of existing technologies, combined with the current processing methods, when the duty monitor finds a fault, it is necessary to sort out the brief situation and then report to the dispatcher, and notify the operation and maintenance duty officer to rush to the substation to confirm the fault. The dispatcher also needs to judge the cause of the fault based on the report of the monitor and the on-site operation and maintenance duty officer, and then issue an order to isolate the fault and restore power supply. The whole process is time-consuming and labor-intensive. It takes at least half an hour from fault confirmation to 10kV line load recovery. In addition, the time spent is often greatly extended because the disposal station (equipment) is far away from the operation and maintenance station or the traffic is not smooth.

Summary of the invention

In view of the problem in the prior art that main grid fault recovery is time-consuming and labor-intensive, the present invention provides a main and distribution network intelligent linkage system and a method for realizing full shutdown and full transfer in case of faults, which is used to realize intelligent identification of fault type and real-time calculation of load to be transferred when a main grid fault causes a complete shutdown of the substation, or a 10kV busbar in the substation loses power and the standby automatic transfer fails. Combined with the reverse transmission channel limit, load switching and reverse transmission can be accurately performed throughout the entire network to reduce fault recovery time.

The following is the technical solution of the present invention.

A main distribution network intelligent linkage system, comprising:

Intelligent linkage device, connected to the bus, used to collect bus signals, perform charging and discharging operations, and determine whether the bus is faulty;

The dispatching module is connected to the intelligent linkage device and is used to perform load transfer and/or reverse transmission operations according to the data provided by the intelligent linkage device.

Preferably, the intelligent linkage device determines whether to perform charging and discharging operations and whether the bus is faulty by collecting circuit breaker signals and bus voltage signals connected to the bus.

Preferably, the dispatching module includes a transfer module and a reverse supply module, the transfer module is used to: disconnect the switch on the line outlet side, close the connecting switch, and transfer the load of each line to another bus; the reverse supply module is used to: close the reverse supply line switch by reverse supplying the line, send the power to the bus, and reverse supply the power to the dedicated line.

Preferably, the scheduling module is also used to execute: when the bus loses pressure and it is determined that the bus is not faulty, calculate whether the total load on the bus before the line was opened and the load of the first or second reverse channel exceeds the limit of the first or second reverse channel; if it exceeds the limit, list the line switches that need to be cut off; after the switches are cut off, recalculate the load and provide a list, and continue calculating until it does not exceed the limit of the reverse channel.

Preferably, the power transfer module is further used for: when it is determined that the busbar loses pressure, it delays for 60s, and according to the list of line switches to be cut off as needed, first open the substation side outlet switch according to the list in a first-open-then-close manner, and then close the connecting switch of each line; whether the power transfer is successful needs to be verified and judged, and the judgment criterion is the corresponding changes in the remote signal position and flow of the substation side outlet switch and the connecting switch on the line; when the system determines that a line does not have the power transfer conditions, the line does not trigger the power transfer function; in addition, if the busbar loses pressure and it is determined that the busbar is faulty, the first reverse transmission channel also needs to transfer.

The present invention also provides a method for realizing full stop and full rotation in case of main distribution network failure, which adopts the above-mentioned main distribution network intelligent linkage system and includes the following steps:

Collect busbar related data;

Calculate and judge the collected relevant data;

Based on the situation judgment results, selectively perform charging and discharging operations, load transfer or reverse operation.

Preferably, the collecting bus-related data includes:

Collect telesignal quantities: telesignal quantities of the main transformer low-voltage side switch, 10kV busbar switch, and each outgoing line switch under the 10kV busbar; telesignal quantities of the main transformer low-voltage backup protection action and 10kV busbar protection action; telesignal quantities of the main transformer low-voltage side switch and 10kV busbar switch manual trip/remote trip;

Telemetered measurement: current and active telemetered measurement of the low-voltage side of the main transformer, 10kV busbar switch, each outgoing line under the 10kV bus and the opposite line; voltage telemetered measurement of the 10kV busbar.

Preferably, the calculation of the collected relevant data includes: when the bus loses pressure and it is determined that the bus is not faulty, calculating whether the total load on the bus before the line was opened and the load of the first or second reverse channel exceeds the limit of the first or second reverse channel; if it exceeds the limit, making a list of line switches that need to be cut off; after the switches are cut off, recalculating the load and providing a list, and continuing the calculation until it does not exceed the limit of the reverse channel.

Preferably, the load transfer includes: when it is determined that the busbar loses pressure, there is a delay of 60s, and according to the list of line switches to be cut off as needed, the substation side outgoing line switch is first opened according to the list in a first-open-then-close manner, and then the connecting switch of each line is closed; whether the transfer is successful needs to be verified and judged, and the judgment criterion is the corresponding changes in the remote signal position and flow of the substation side outgoing line switch and the connecting switch on the line; when the system determines that a line does not have the conditions for transfer, the line does not trigger the transfer function; in addition, if the busbar loses pressure and it is determined that the busbar is faulty, the first reverse transmission channel also needs to be transferred.

The substantial effects of the present invention include: the main distribution network intelligent linkage device and the dispatching module are combined, and the time required for the substation to be completely shut down to complete the transfer and reverse transmission can be reduced to seconds, thereby improving the power supply reliability, effectively shortening the power outage time, and being able to quickly restore the 10 kV bus and the load it carries, thereby realizing the rapid linkage of the main distribution network with power grid risks.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the main wiring of an embodiment of the present invention;

FIG2 is a schematic diagram of charging and discharging of an embodiment of the present invention;

3 is a schematic diagram of fault judgment and load dedicated supply according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of the reverse feeding operation according to an embodiment of the present invention.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution will be clearly and completely described below in combination with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

It should be understood that in various embodiments of the present invention, the size of the sequence number of each process does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

It should be understood that in the present invention, "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

It should be understood that in the present invention, "plurality" refers to two or more than two. "And/or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character "/" generally indicates that the objects associated before and after are in an "or" relationship. "Contains A, B and C", "Contains A, B, C" means that A, B, and C are all included, "Contains A, B or C" means that one of A, B, and C is included, and "Contains A, B and/or C" means that any one, any two, or any three of A, B, and C are included.

The technical solution of the present invention is described in detail with specific embodiments below. The embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

Example:

A main distribution network intelligent linkage system and a method for realizing full stop and full transfer in case of failure, the system comprises:

Intelligent linkage device, connected to the bus, used to collect bus signals, perform charging and discharging operations, and determine whether the bus is faulty;

The dispatching module is connected to the intelligent linkage device and is used to perform load transfer and/or reverse transmission operations according to the data provided by the intelligent linkage device.

1 is a main wiring diagram of an embodiment of the present invention. In this embodiment, the intelligent linkage device determines whether to perform charging and discharging operations and whether the bus is faulty by collecting circuit breaker signals and bus voltage signals connected to the bus.

As shown in Figure 2, charging conditions ("and" relationship): a) at least one switch of 1DL and 3DL is in the closed position; b) 10kV busbar I has voltage. Discharging conditions ("or" relationship): a) manual trip/remote trip 1DL; b) manual trip/remote trip 3DL; c) 1DL and 3DL are both in the open position and last for 300s; d) 1DL and 3DL circuit breakers are in abnormal position; e) the main interlock is opened; f) 10kV busbar I has no voltage and lasts for 180s.

As shown in FIG3 , it is a schematic diagram of fault judgment and dedicated load supply of an embodiment of the present invention. After charging is completed, if the 10kV busbar Ibus has no voltage, the incoming line IL1 has no current, and the segmented current has no current (when the segmented switch is closed), after a delay (the default is 60s, avoiding the standby action time), the 1DL and 3DL switches are tripped, and the line switches on the busbar that need to be transferred are cut in parallel;

After confirming that the positions of 1DL and 3DL are separated, if it is determined that it is not a bus fault, a backup supply start-up command is sent to the 5200 distribution system, and the 5200 distribution system performs the load transfer operation. After the load transfer is completed, the bus reverse operation is performed, the reverse line is closed, and the load is reversed to the dedicated line; if it is determined that it is a bus fault, the backup supply device is discharged and relevant signals are sent up.

There are three types of busbar fault judgment:

a) 1DL is closed, 3DL is open, busbar fault occurs, #1 main transformer backup protection is activated, 1DL switch is tripped, I bus has no pressure, 1DL and 3DL switches are open;

The action of #1 main transformer is taken as the criterion for busbar fault judgment.

b) 1DL is closed, 3DL is closed, busbar fault occurs, #1 main transformer or busbar protection is activated, and the section switch is tripped;

If the fault is on bus I, after the #1 main transformer protection trips the section switch, it continues to trip the low-voltage side switch. At this time, bus I has no pressure, bus II has no pressure, and switches 1DL and 3DL are open.

If the fault is on bus II, after #1 main transformer or bus section protection operates to trip the sectionalizing switch, bus I will have pressure and bus II will have no pressure, the fault will be removed and the load on bus I does not need to be switched.

Take #1 main transformer action + I bus no pressure + 1DL, 3DL positions as bus fault judgment criteria.

c) 1DL is open, 3DL is closed, busbar fault occurs, #2 main transformer protection or busbar disconnection occurs, and the sectionalizing switch is tripped;

If the fault is in bus I, the #2 main transformer protection or bus section protection will operate to trip the sectionalizing switch, and the fault will be removed. At this time, bus I has no pressure, bus II has pressure, and switches 1DL and 3DL are open.

If the fault is in bus II, the #2 main transformer protection will trip the section switch and then the low-voltage side switch. At this time, bus I has no pressure, bus II has no pressure, and switches 1DL and 3DL are open.

The bus fault judgment criteria are the action of the section switch of #2 main transformer protection or the action of the bus protection (if any) + the non-action of the low-voltage side switch of #2 main transformer + no pressure on I bus + the positions of 1DL and 3DL.

In this embodiment, the system needs to collect the following information from the substation:

Remote signal quantity:

1) Remote signaling quantity of the low-voltage side switch of the main transformer, the 10kV busbar switch, and each outgoing line switch under the 10kV busbar;

2) Remote signaling of main transformer low backup protection action and 10kV busbar protection action;

3) The remote signal quantity of the manual trip/remote trip of the low-voltage side switch of the main transformer and the 10kV busbar switch.

Telemetering: Telemetering of current and active power on the low-voltage side of the main transformer, 10kV busbar switch, outgoing lines under the 10kV bus and opposite lines; Telemetering of voltage on the 10kV busbar.

And judge four aspects: 1) "Main and distribution network intelligent linkage" is available. 2) "Main and distribution network intelligent linkage" is locked. 3) 10kV busbar loses voltage. 4) 10kV busbar is faulty.

1) “Intelligent linkage of main and distribution networks” is available: the charging conditions are the same as those of the above-mentioned devices.

2) “Main and distribution network intelligent linkage” interlocking: the same discharge conditions as the above-mentioned devices.

3) 10kV busbar loses voltage: "Intelligent linkage of main and distribution network" is available; 10kV busbar Ibus has no voltage; incoming line IL1 has no current; section current has no current (when the busbar switch is closed).

4) 10kV bus fault: same bus fault judgment logic as the device described above.

When it is determined that the busbar has lost pressure and is not faulty, calculate whether the total load on the busbar before the line was opened and the load of the first (or second) reverse channel exceeds the limit of the first (or second) reverse channel. If it exceeds the limit, provide a list of line switches that need to be cut off (the order of line cuts at each station needs to be configured) to the transfer module. After the switch is cut, calculate again and provide a list (the switches that could not be opened before need to be excluded), and continue calculating until the limit of the reverse channel is not exceeded. When the reverse of the first channel does not exceed the limit, send a message to the reverse module. When the reverse of the second channel does not exceed the limit, send a message to the reverse module.

When it is determined that the busbar loses pressure, the delay is 60S (to avoid the 10kV standby automatic switching action time), and at the same time, the list of line switches that need to be cut provided by the calculation module is received, and the transfer module is started. The transfer method is to open first and then close. First, open the outgoing line switch on the substation side according to the list provided by the calculation module (the actual opened switch needs to be fed back to the calculation module), and then close the connecting switch of each line. Whether the transfer is successful needs to be verified and judged. The judgment criteria are the corresponding changes in the remote signal position and flow of the outgoing line switch on the substation side and the connecting switch on the line. When the system determines that a certain line does not have the conditions for transfer (such as the connecting switch does not belong to the automation area), the line does not trigger the transfer function. In addition, if the busbar loses pressure and it is determined that the busbar is faulty, the first reverse transmission channel also needs to transfer.

As shown in Figure 4, it is a schematic diagram of the reverse transmission operation of an embodiment of the present invention. When it is determined that the busbar loses pressure and the busbar is not faulty, 1DL and 3DL are first opened, and when the "first channel reverse transmission does not exceed the limit" information sent by the calculation module is received, the contact switch of the first reverse transmission channel is closed. If the contact switch of the first reverse transmission channel fails to close, or the first reverse transmission channel does not meet the reverse transmission conditions, the second reverse transmission channel is used for reverse transmission, and the premise is also to receive the "second channel reverse transmission does not exceed the limit" information sent by the calculation module.

This embodiment collects and determines whether the bus is faulty, calculates and executes strategies through a program; when a main grid fault causes a complete shutdown of the 110kV (35kV) substation or a power outage of the 110kV (35kV) bus, the main and distribution network intelligent linkage device is used to determine whether the bus is faulty, and the collected data information is sent to the main and distribution network intelligent linkage dispatching application. The system performs full load transfer and reverse transmission based on the determination result.

Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the specific device can be divided into different functional modules to complete all or part of the functions described above.

In the embodiments provided in the present application, it should be understood that the disclosed structures and methods can be implemented in other ways. For example, the embodiments of the structure described above are only schematic. For example, the division of modules or units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another structure, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, structures or units, which can be electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

In addition, each functional unit in the embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium, including several instructions to enable a device (which can be a single-chip microcomputer, chip, etc.) or a processor (processor) to perform all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program code.

The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims (7)

1. A main distribution network intelligent linkage system, characterized by comprising: Intelligent linkage device, connected to the bus, used to collect bus signals, perform charging and discharging operations, and determine whether the bus is faulty; A dispatching module, connected to the intelligent linkage device, for executing load transfer and/or reverse transmission operations according to data provided by the intelligent linkage device; The dispatching module includes a transfer module and a reverse supply module. The transfer module is used to disconnect the line outlet side switch, close the contact switch, and transfer the load of each line to another busbar; the reverse supply module is used to close the reverse supply line switch by reverse supply, send the power to the busbar, and reverse supply the power to the dedicated line. The scheduling module is also used to execute: when the bus loses pressure and it is determined that the bus is not faulty, calculate whether the total load on the bus before the line is opened and the pressure is lost plus the load of the first or second reverse channel exceeds the limit of the first or second reverse channel; if it exceeds the limit, list the line switches that need to be cut off; after the switch is cut off, recalculate the load and provide a list, and continue calculating until it does not exceed the limit of the reverse channel. 2. A main distribution network intelligent linkage system according to claim 1, characterized in that the intelligent linkage device determines whether to perform charging and discharging operations and whether the bus is faulty by collecting circuit breaker signals and bus voltage signals connected to the bus. 3. According to claim 1, a main distribution network intelligent linkage system is characterized in that the transfer module is further used for: when it is determined that the busbar loses pressure, it delays for 60s, and at the same time, according to the list of line switches to be cut off as needed, in a first-open-then-close manner, first open the substation side outlet switch according to the list, and then close the connecting switch of each line; whether the transfer is successful needs to be verified and judged, and the judgment criterion is the corresponding changes in the remote signal position and flow of the substation side outlet switch and the connecting switch on the line; when the system determines that a line does not have the conditions for transfer, the line does not trigger the transfer function; in addition, if the busbar loses pressure and it is determined that the busbar is faulty, the first reverse transmission channel also needs to transfer. 4. A method for realizing full stop and full rotation of a main distribution network fault, using the main distribution network intelligent linkage system as claimed in any one of claims 1 to 3, characterized in that it comprises the following steps: Collect busbar related data; Calculate and judge the collected relevant data; Based on the situation judgment results, selectively perform charging and discharging operations, load transfer or reverse operation. 5. A method for realizing full stop and full rotation of a main distribution network fault according to claim 4, characterized in that said collecting bus-related data comprises: Collect telesignal quantities: telesignal quantities of the main transformer low-voltage side switch, 10kV busbar switch, and each outgoing line switch under the 10kV busbar; telesignal quantities of the main transformer low-voltage backup protection action and 10kV busbar protection action; telesignal quantities of the main transformer low-voltage side switch and 10kV busbar switch manual trip/remote trip; Telemetered measurement: current and active telemetered measurement of the low-voltage side of the main transformer, 10kV busbar switch, each outgoing line under the 10kV bus and the opposite line; voltage telemetered measurement of the 10kV busbar. 6. A method for achieving full stop and full rotation due to a main distribution network fault according to claim 4, characterized in that the calculation of the collected relevant data includes: when the bus loses pressure and it is determined that the bus is not faulty, calculating whether the total load on the bus before the line was opened and lost pressure plus the load of the first or second reverse channel exceeds the limit of the first or second reverse channel; if it exceeds the limit, making a list of line switches that need to be cut off; after the switches are cut off, recalculating the load and providing a list, and continuing the calculation until it does not exceed the limit of the reverse channel. 7. A method for realizing full stop and full transfer due to main distribution network fault according to claim 4, characterized in that the load transfer includes: when it is determined that the busbar loses pressure, there is a delay of 60s, and according to the list of line switches to be cut off as needed, the substation side outlet switch is first opened according to the list in a first-open-then-close manner, and then the connecting switch of each line is closed; whether the transfer is successful needs to be verified and judged, and the judgment criterion is the corresponding changes in the remote signal position and flow of the substation side outlet switch and the connecting switch on the line; when the system determines that a line does not have the conditions for transfer, the line does not trigger the transfer function; in addition, if the busbar loses pressure and it is determined that the busbar is faulty, the first reverse transmission channel also needs to be transferred.