Distribution network backup automatic device

Abstract

The present invention relates to the field of distribution network control technology, and in particular to a distribution network standby automatic switching device, a start-up module, a condition detection module, a reminder module, a restart module, an action module and a termination module, wherein the start-up module is connected to the condition detection module, the condition detection module is respectively connected to the action module and the reminder module, the action module is connected to the termination module, the reminder module is connected to the restart module, and the restart module is connected to the start-up module. After the 10kV bus loses power, the present invention can automatically restore the load of the non-fault 10kV line through the handle line, greatly shortening the accident handling and load recovery time after the whole station loses power; the device, as an auxiliary tool for the dispatcher to handle accidents, can reduce the dispatcher's inconsideration, resulting in the overload tripping of the handle line, the asynchronous grid connection of small thermal power, etc., and effectively prevent the expansion of accidents.

Description

Technical Field

[0001] The present invention relates to the technical field of power distribution network control technology, and in particular to a power distribution network backup automatic switching device. Background Art

[0002] At present, the main types of backup devices are as follows: substation incoming line backup, section backup, bridge backup, and transformer backup.

[0003] At present, the maintenance work of power grid is becoming more and more arduous. Once the upper power supply fails, cross-level failures or even multiple failures occur during the maintenance state, it is very likely to cause the entire substation to lose power. The current distribution network disposal measures for the loss of power in the entire substation are: instruct the monitoring team to open all the outgoing switches of the power-lost bus, understand the connection status of each line, analyze the load of each line, the load of the opposite side handle line and the current limit value, and transfer the line load that meets the transfer conditions through the contact switch, and then select the appropriate handle line to reverse the 10 kV bus and station transformer. This process mainly relies on the fault handling experience of the dispatcher, which takes a long time to handle, the process is cumbersome and prone to errors. With the continuous development of the economy and society, customers have higher and higher requirements for the level of power supply services. There is an urgent need for a distribution network standby device to quickly restore the 10 kV load lost due to the loss of power in the entire substation. For this reason, we propose a distribution network standby automatic device. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a distribution network backup automatic switching device.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A distribution network backup automatic switching device comprises a start-up module, a condition detection module, a reminder module, a restart module, an action module and a termination module, wherein the start-up module is connected to the condition detection module, the condition detection module is respectively connected to the action module and the reminder module, the action module is connected to the termination module, the reminder module is connected to the restart module, and the restart module is connected to the start-up module.

[0007] As a preferred technical solution of the present application, the condition detection module is used to detect the starting conditions during the operation of the starting module, and the starting conditions include three necessary items, namely: no voltage on the 10kV busbar of station A, no current on the 901 switch on the 10kV side of the #1 main transformer, no current on the 902 switch on the 10kV side of the #2 main transformer, and the duration exceeds 5 seconds.

[0008] As a preferred technical solution of the present application, the action module has the following three groups of action characteristics:

[0009] a. Delay start for 5 seconds to avoid the tripping and closing time of the upper line;

[0010] b. Trip off the 901 switch on the 10kV side of the #1 main transformer, the 902 switch on the 10kV side of the #2 main transformer, the 900 switch on the 10kV section, all 10kV outgoing line switches, and disconnect the grid-connected switches of small thermal power plants;

[0011] c. After the standby device detects that the switch at the corresponding line station end has tripped, it remotely closes the line contact switch with a single handle.

[0012] As a preferred technical solution of the present application, when the action module and the termination module lock the device, one of the following conditions is required: there is a protection action signal on the 10kV line on this side, and the line is locked for standby; the main transformer low backup protection trips, and the standby is locked; before tripping, the sum of the current value of the line and the current value of the handle line on the opposite side is greater than the current limit of the handle line, and the line is locked for standby.

[0013] As a preferred technical solution of the present application, the action module includes a measurement and control module, a protection module, a communication module, a power supply module and a CPU module.

[0014] As a preferred technical solution of the present application, the working steps of the action module are:

[0015] The 10 kV PT bay merging unit of station A collects the 10 kV bus voltage of sections I and II in real time, and the merging units of switch bay 901 of the #1 main transformer and switch bay 902 of the #2 main transformer collect the switch current in real time. These two telemetry values ​​are transmitted to the measurement and control module in the standby device through the data network (SV network);

[0016] The 10 kV bus loses power, the bus voltage collected by the measurement and control module in the backup device is lower than the rated value, and the current of the low-voltage side switch of the main transformer is lower than the rated value. When these two conditions are met at the same time, the backup device starts after a delay of 5 seconds. At this time, the CPU module sends a trip signal to the protection module, which is transmitted to the intelligent terminals of the low-voltage side switch of the main transformer, the bus section switch, and each 10 kV outgoing switch through the signal network (GOOSE network) to achieve trip;

[0017] The trip signal is then fed back to the protection module through the signal network (GOOSE network). At this time, the telemetered value of the bus voltage on the opposite side of the power plant corresponding to the handle line, the telemetered value of the current of the line switch on this side, and the telemetered value of the current of the handle line switch are transmitted to the measurement and control module in the standby device through the data network (SV network). After the CPU module logically judges that there is no current flow and no locking signal, the control protection module sends a contact switch closing signal, which is transmitted to the intelligent terminal of the contact switch through the signal network (GOOSE network) to control the switch to close once.

[0018] As a preferred technical solution of the present application, the reminder module sends a signal when the condition detection module detects that the condition is not met, and enables the restart module to drive the start module to operate, thereby enabling the entire device to operate.

[0019] As a preferred technical solution of the present application, when the whole station equipment is in a special situation of power outage for maintenance, the entire device needs to be shut down, and the outlet pressure plate corresponding to the device needs to be shut down for power outage for maintenance of the handle line.

[0020] The beneficial effects of the present invention are:

[0021] (1) After the 10kV bus loses power, the device can automatically restore the load of the non-faulty 10kV line through the handle line, greatly shortening the accident handling and load recovery time after the entire station loses power.

[0022] (2) As an auxiliary tool for dispatchers to handle accidents, the device can reduce the dispatcher's carelessness, resulting in overload tripping of the handle line and asynchronous grid connection of small thermal power plants, and effectively prevent the expansion of accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the process of the power distribution network backup automatic switching device proposed by the present invention;

[0024] Figure 2 It is a schematic diagram of the action module of the power distribution network backup automatic switching device proposed by the present invention;

[0025] Figure 3 This is a schematic diagram of the working principle of the distribution network backup automatic switching device proposed by the present invention. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] Reference Figure 1-3 The distribution network backup automatic investment device includes a start-up module, a condition detection module, a reminder module, a restart module, an action module and a termination module. The start-up module is connected to the condition detection module, the condition detection module is respectively connected to the action module and the reminder module, the action module is connected to the termination module, the reminder module is connected to the restart module, and the restart module is connected to the start-up module.

[0028] Furthermore, the condition detection module is used to detect the starting conditions during the operation of the starting module, and the starting conditions include three necessary items, namely: no voltage on the 10kV busbar of station A, no current on the 901 switch on the 10kV side of the #1 main transformer, no current on the 902 switch on the 10kV side of the #2 main transformer, and the duration exceeds 5 seconds.

[0029] Furthermore, the action module has the following three groups of action characteristics:

[0030] a. Delay start for 5 seconds to avoid the tripping and closing time of the upper line;

[0031] b. Trip off the 901 switch on the 10kV side of the #1 main transformer, the 902 switch on the 10kV side of the #2 main transformer, the 900 switch on the 10kV section, all 10kV outgoing line switches, and disconnect the grid-connected switches of small thermal power plants;

[0032] c. After the standby device detects that the switch at the corresponding line station end has tripped, it remotely closes the line contact switch with a single handle.

[0033] Furthermore, when the action module and the termination module lock the device, one of the following conditions is required: there is a protection action signal on the 10kV line on this side, and the line is locked for standby; the main transformer low backup protection trips, and the standby is locked; before tripping, the sum of the current value of the line and the current value of the handle line on the opposite side is greater than the current limit of the handle line, and the line is locked for standby.

[0034] Furthermore, the action module includes a measurement and control module, a protection module, a communication module, a power supply module and a CPU module.

[0035] Specifically, the working steps of the action module are:

[0036] The 10 kV PT bay merging unit of station A collects the 10 kV bus voltage of sections I and II in real time, and the merging units of switch bay 901 of the #1 main transformer and switch bay 902 of the #2 main transformer collect the switch current in real time. These two telemetry values ​​are transmitted to the measurement and control module in the standby device through the data network (SV network);

[0037] The 10 kV bus loses power, the bus voltage collected by the measurement and control module in the backup device is lower than the rated value, and the current of the low-voltage side switch of the main transformer is lower than the rated value. When these two conditions are met at the same time, the backup device starts after a delay of 5 seconds. At this time, the CPU module sends a trip signal to the protection module, which is transmitted to the intelligent terminals of the low-voltage side switch of the main transformer, the bus section switch, and each 10 kV outgoing switch through the signal network (GOOSE network) to achieve trip;

[0038] The trip signal is then fed back to the protection module through the signal network (GOOSE network). At this time, the telemetered value of the bus voltage on the opposite side of the power plant corresponding to the handle line, the telemetered value of the current of the line switch on this side, and the telemetered value of the current of the handle line switch are transmitted to the measurement and control module in the standby device through the data network (SV network). After the CPU module logically judges that there is no current flow and no locking signal, the control protection module sends a contact switch closing signal, which is transmitted to the intelligent terminal of the contact switch through the signal network (GOOSE network) to control the switch to close once.

[0039] Furthermore, the reminder module sends a signal when the condition detection module detects that the condition is not met, and enables the restart module to drive the start module to operate, thereby enabling the entire device to operate.

[0040] Furthermore, in the special case where the entire station equipment is out of power for maintenance, the entire device needs to be shut down, and the outlet pressure plate corresponding to the device needs to be shut down for maintenance of the handle line.

[0041] Workflow: First, start the system through the startup module, and then perform the test under the calibration of the condition detection module. When the power station meets the following three conditions:

[0042] There is no voltage on the 10kV busbar of station A, no current on the 901 switch on the 10kV side of #1 main transformer, and no current on the 902 switch on the 10kV side of #2 main transformer; the duration exceeds 5 seconds.

[0043] Then, the action module is made to cooperate with the internal working module to carry out corresponding working steps according to the corresponding action characteristics (a, delay start for 5 seconds to avoid the tripping and reclosing time of the upper line; b, trip the 901 switch on the 10kV side of the #1 main transformer, the 902 switch on the 10kV side of the #2 main transformer, the 900 switch on the 10kV section, and all the 10kV outgoing line switches, and connect the grid-connected switches of small thermal power plants; c, after the standby device detects that the corresponding line station end switch has tripped, it remotely closes the line contact switch once.), including the real-time acquisition of the 10kV I and II bus voltages by the 10kV PT interval merging unit of the A station, and the real-time acquisition of the switch current by the merging unit of the 901 switch interval of the #1 main transformer and the 902 switch interval of the #2 main transformer. These two telemetry values ​​are transmitted to the measurement and control module in the standby device through the data network (SV network);

[0044] The 10 kV bus loses power, the bus voltage collected by the measurement and control module in the backup device is lower than the rated value, and the current of the low-voltage side switch of the main transformer is lower than the rated value. When these two conditions are met at the same time, the backup device starts after a delay of 5 seconds. At this time, the CPU module sends a trip signal to the protection module, which is transmitted to the intelligent terminals of the low-voltage side switch of the main transformer, the bus section switch, and each 10 kV outgoing switch through the signal network (GOOSE network) to achieve trip;

[0045] The trip signal is then fed back to the protection module through the signal network (GOOSE network). At this time, the telemetered value of the bus voltage on the opposite side of the power plant corresponding to the handle line, the telemetered value of the current of the line switch on this side, and the telemetered value of the current of the handle line switch are transmitted to the measurement and control module in the standby device through the data network (SV network). After the CPU module logically judges that there is no current flow and no locking signal, the control protection module sends a contact switch closing signal, which is transmitted to the intelligent terminal of the contact switch through the signal network (GOOSE network) to control the switch to close once. Until the final termination module ends the working position of the standby automatic device;

[0046] If, at the beginning of startup, the startup conditions detected by the condition detection module do not meet the corresponding startup conditions, the staff will be reminded through the reminder module, and after inspection, the startup module will be started through the restart module until the device works.

[0047] Finally, it should be noted that in the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0048] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A power distribution network backup automatic switching device, comprising a startup module, a condition detection module, a reminder module, a restart module, an action module and a termination module, characterized in that: The startup module is connected to the condition detection module, the condition detection module is connected to the action module and the reminder module respectively, the action module is connected to the termination module, the reminder module is connected to the restart module, and the restart module is connected to the startup module; The action module has the following three sets of action characteristics: a. Delay start for 5 seconds to avoid the tripping and closing time of the upper line; B. Trip off the 901 switch on the 10kV side of the #1 main transformer, the 902 switch on the 10kV side of the #2 main transformer, the 900 switch on the 10kV section, all 10kV outgoing line switches, and disconnect the grid-connected switch of the small thermal power plant; C. After the standby device detects that the corresponding line station end switch has tripped, it remotely closes the line contact switch with a single handle; The working steps of the action module are: The 10 kV PT bay merging unit of station A collects the 10 kV bus voltage of sections I and II in real time, and the merging units of switch bay 901 of #1 main transformer and switch bay 902 of #2 main transformer collect the switch current in real time. These two telemetry values ​​are transmitted to the measurement and control module in the standby device through the data network (SV network); The 10 kV bus loses power, the bus voltage collected by the measurement and control module in the backup device is lower than the rated value, and the current of the low-voltage side switch of the main transformer is lower than the rated value. When these two conditions are met at the same time, the backup device starts after a delay of 5 seconds. At this time, the CPU module sends a trip signal to the protection module, which is transmitted to the intelligent terminals of the low-voltage side switch of the main transformer, the bus section switch, and each 10 kV outgoing switch through the signal network (GOOSE network) to achieve trip; The trip signal is then fed back to the protection module through the signal network (GOOSE network). At this time, the telemetered value of the bus voltage on the opposite side of the power station corresponding to the handle line, the telemetered value of the current of the line switch on this side, and the telemetered value of the current of the handle line switch are transmitted to the measurement and control module in the standby device through the data network (SV network); after the CPU module logically judges that there is no current flow and no locking signal, the control protection module sends a contact switch closing signal, which is transmitted to the intelligent terminal of the contact switch through the signal network (GOOSE network) to control the switch to close once.

2. The distribution network backup automatic switching device according to claim 1, characterized in that: The condition detection module is used to detect the starting conditions during the operation of the starting module, and the starting conditions include three necessary items, namely: no voltage on the 10kV busbar of station A, no current on the 901 switch on the 10kV side of the #1 main transformer, no current on the 902 switch on the 10kV side of the #2 main transformer, and the duration exceeds 5 seconds.

3. The distribution network backup automatic switching device according to claim 1, characterized in that: When the action module and the termination module lock the device, one of the following conditions is required: there is a protection action signal on the 10kV line on this side, locking the line for standby switching; the main transformer low backup protection trips, locking the standby switching; before tripping, the sum of the current value of the line and the current value of the handle line on the opposite side is greater than the current limit of the handle line, locking the line for standby switching.

4. The distribution network backup automatic switching device according to claim 1, characterized in that: The action module includes a measurement and control module, a protection module, a communication module, a power supply module and a CPU module.

5. The distribution network backup automatic switching device according to claim 1, characterized in that: The reminder module sends a signal when the condition detection module detects that the condition is not met, and enables the restart module to drive the start module to operate, thereby enabling the entire device to operate.

6. The distribution network backup automatic switching device according to claim 1, characterized in that: When the whole station equipment is in a special situation of power outage for maintenance, the entire device needs to be shut down, and the corresponding outlet pressure plate of the device needs to be shut down for power outage of the handle line for maintenance.

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