CN113394773B - Isolated network operation abnormal domain removing method, device, equipment and storage medium - Google Patents
Isolated network operation abnormal domain removing method, device, equipment and storage medium Download PDFInfo
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- CN113394773B CN113394773B CN202110695779.3A CN202110695779A CN113394773B CN 113394773 B CN113394773 B CN 113394773B CN 202110695779 A CN202110695779 A CN 202110695779A CN 113394773 B CN113394773 B CN 113394773B
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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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- 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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/08—Synchronising of networks
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/42—Synchronising a generator for connection to a network or to another generator with automatic parallel connection when synchronisation is achieved
Abstract
The invention discloses a method, a device, equipment and a storage medium for removing a foreign domain in isolated network operation. The isolated network operation abnormal domain relieving method comprises the steps of obtaining the position of a bus to be connected in a state that a fault power grid is in isolated network operation; determining a bus where a target automatic quasi-synchronization device is located as a reference bus; adjusting the operation parameters of a target bus with the same voltage level as the reference bus under the fault power grid to ensure that the difference value between the operation parameters of the target bus and the operation parameters of the reference bus is within a preset first preset range; sending out a synchronization instruction to a target automatic quasi-synchronization device; and sending a closing command to a grid-connected switch corresponding to the bus to be grid-connected. The difference value between the operation parameters of the target bus and the operation parameters of the reference bus is in a first preset range, and then the grid connection is completed by the target automatic quasi-synchronization device, so that the situation that the grid connection releases the isolated grid operation state under the fault power grid to cause large-scale grid disconnection can be avoided.
Description
Technical Field
The embodiment of the invention relates to a power grid security technology, in particular to a method, a device, equipment and a storage medium for removing a foreign domain in isolated network operation.
Background
Distribution networks refer to power networks that receive electrical energy from a power transmission network or regional power plant and then distribute the electrical energy locally or step-by-step in voltage across distribution facilities to various customers. The whole power distribution network has a plurality of voltage classes, and electric energy is conveyed from a high voltage class to a low voltage class by means of voltage reduction and distribution substations for regulating the voltage.
In the operation process, when a line of a certain voltage level of the power distribution network fails, a power distribution substation of a high voltage level can be influenced to supply power to the power distribution substation, so that the power distribution substation can only rely on a generator which normally works under the voltage level to supply power to loads of peripheral local areas, and the generator under the voltage level is in a isolated network operation state separated from a large power grid. The power generator in the isolated network running state can not be supported by the power distribution network, power supply is guaranteed only by acting on the power generator, and once the power generator suddenly jumps, the regional power grid is broken and power is interrupted, so that normal power consumption of a user is influenced, and production is influenced. The current common practice is to disconnect the generator in the isolated grid running state and then re-grid the generator with the power distribution network so as to ensure stable power supply.
But the release of the isolated network operation state is realized in a grid-connected mode after disconnection, power failure operation is required to be carried out on a corresponding area, and the store can be restarted after grid combination is completed, so that the normal operation of equipment in the area is influenced, the normal power consumption of users is influenced, and the production is influenced.
Disclosure of Invention
The invention provides a method, a device, equipment and a storage medium for releasing a isolated network operation abnormal domain, which are used for realizing the release of the isolated network operation state of power generation equipment with low cost.
In a first aspect, an embodiment of the present invention provides a method for removing a foreign domain in isolated network operation, including:
acquiring the position of a bus to be connected in a grid-connected state of a fault power grid in a grid-isolated operation state, wherein the fault power grid comprises a plurality of buses with different voltage levels;
determining a target automatic quasi-synchronization device of the different domain based on the position of the bus to be grid-connected;
determining a bus where the target automatic quasi-synchronization device is located as a reference bus;
adjusting the operation parameters of a target bus with the same voltage level as the reference bus under the fault power grid, so that the difference value between the operation parameters of the target bus and the operation parameters of the reference bus is within a preset first preset range;
sending out a synchronization instruction to the target automatic quasi-synchronization device;
after the completion of the closing of the target automatic quasi-synchronization device is detected, a closing command is sent to a grid-connected switch corresponding to the bus to be grid-connected.
In a second aspect, an embodiment of the present invention further provides a device for removing a foreign domain in isolated network operation, including:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the position of a bus to be connected with a grid in a state of isolated grid operation of a fault power grid, and the fault power grid comprises a plurality of buses with different voltage levels;
the target determining module is used for determining a target automatic quasi-synchronization device of the different domains based on the position of the bus to be connected;
the reference determining module is used for determining a bus where the target automatic quasi-synchronization device is located as a reference bus;
the adjusting module is used for adjusting the operation parameters of the target bus with the same voltage level as the reference bus under the fault power grid, so that the difference value between the operation parameters of the target bus and the operation parameters of the reference bus is within a preset first preset range;
the synchronization module is used for sending a synchronization instruction to the target automatic quasi-synchronization device;
and the switching-on module is used for sending a switching-on command to a grid-connected switch corresponding to the bus to be grid-connected after the completion of switching-on of the target automatic quasi-synchronization device is detected.
In a third aspect, an embodiment of the present invention further provides a device for removing a foreign domain in isolated network operation, where the device includes:
one or more processors;
storage means for storing one or more programs,
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the isolated network operation foreign domain removal method as described in the first aspect.
In a fourth aspect, embodiments of the present invention also provide a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform the isolated network operation foreign domain removal method according to the first aspect.
In this embodiment, by acquiring the target automatic quasi-synchronization device located at the different domain position, adjusting the operation parameters of the reference bus and the target bus to be integrated into the power grid under the fault power grid at the same voltage level as the target automatic quasi-synchronization device, and adjusting the operation parameters of the reference bus according to the operation parameters of the target bus, the difference between the operation parameters of the target bus and the operation parameters of the reference bus is within a preset first preset range, so that the difference between the power environment of the fault power grid and the power environment to be integrated into the power grid can be effectively reduced, the instant large impact current is avoided during grid connection, the stability of the fault power grid and the power grid to be integrated into is effectively ensured, the large-scale grid disconnection caused by the grid connection release of the grid connection operation state is avoided, and the influence and loss during grid connection release are effectively reduced.
Drawings
Fig. 1a is a flowchart of a method for removing a foreign domain in isolated network operation according to an embodiment of the present invention;
FIG. 1b is a schematic diagram of a power grid to be integrated and a faulty power grid according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a device for releasing isolated network operation abnormal domain according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a device for removing a foreign domain in isolated network operation according to a third embodiment of the present invention.
Detailed Description
The invention is described in further detail below 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 limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
The distribution network refers to a power network that receives electric energy from a power transmission network or a regional power plant, and distributes the electric energy locally or step by step according to voltage through a distribution facility. The system consists of overhead lines, cables, towers, distribution transformers, isolating switches, reactive compensators, a plurality of auxiliary facilities and the like, and plays a role in distributing electric energy in a power network. Is a power network system consisting of a plurality of power distribution devices (or elements) and power distribution facilities that transform voltages and distribute electrical energy directly to end users.
The distribution network has a plurality of voltage classes, which can be generally divided into: extra-high voltage (1000 kV alternating current and above and +/-800 kV direct current), extra-high voltage (330 kV and above and below 1000 kV), high voltage (35-220 kV), medium voltage (6-20 kV) and low voltage (0.4 kV).
The isolated grid operation in the power grid refers to the short term of isolated grid operation, and generally refers to a small-capacity power grid separated from a large power grid. That is, the power supply line breaks down to disconnect the small-capacity power grid from the large power grid, so that the small-capacity power grid is separated from the large power grid to independently operate, and the power generation equipment function in the small-capacity power grid is relied on. The isolated network operation has higher requirement on the working stability of the generator set of the small-capacity power grid, the frequency of the generator is greatly influenced by load change, the frequency change amplitude is larger, and the generator tripping expansion accident is easily caused when the system is subjected to load shedding. Therefore, grid connection is required to be sought when isolated grid operation occurs, so that the isolated grid operation state of the small-capacity power grid is relieved, and sudden repeated system collapse and accidents are avoided.
The grid connection method of the generator has two kinds of quasi-synchronization and self-synchronization. The quasi-synchronous parallel method is that an outlet short-circuiting device of the generator is connected with a system grid when the frequency, voltage, phase sequence and phase of the generator are completely consistent with a system grid; the method for self-synchronization parallel connection is that the generator is not excited first, when the frequency of the generator is the same as the frequency of the system power grid, the generator outlet breaker is connected with the system, then the exciting current of the generator is increased step by step, the generator is dragged into a synchronous operation mode by the system, the grid-connection mode can absorb a large amount of reactive power from the system when grid connection is performed, thereby reducing the voltage of the system, and the impact current is larger at the moment of switching on the breaker, the mode is not adopted at present, and is only used on a small-capacity old-fashioned machine set, and the mode is widely adopted at present as an automatic quasi-synchronization grid-connection mode, and the mode is judged by a microcomputer to achieve synchronization condition as automatic signaling breaker grid-connection.
However, when the small-capacity power grid enters the isolated grid operation state, the automatic quasi-synchronization device arranged at the outlet of the power generation equipment is in a working state and is connected with the power generation equipment and the small-capacity power grid, and the automatic quasi-synchronization device can not be used for realizing grid connection work with the large-capacity power grid, so that in the prior art, the small-capacity power grid is disconnected firstly, then the power generation equipment and the large-capacity power grid are connected, and finally the power is supplied again.
Example 1
Fig. 1a is a flowchart of a method for releasing a foreign domain in isolated network operation according to an embodiment of the present invention, and fig. 1b is a schematic diagram of a power grid to be integrated and a fault power grid according to an embodiment of the present invention. The embodiment is applicable to the situation that the release of the isolated network operation state of the power supply equipment in the power distribution network is realized by using an automatic quasi-synchronization device of other area positions in the power distribution network, the method can be executed by an isolated network operation abnormal domain release device, the isolated network operation abnormal domain release device can be realized by software and/or hardware, and the isolated network operation abnormal domain release device can be configured in computer equipment, such as a computer, a server and the like, and specifically comprises the following steps:
and 110, acquiring the position of the bus to be connected in the isolated network operation state of the fault power grid.
In the embodiment of the invention, the fault power grid refers to a power transmission grid, wherein the power transmission grid can comprise a plurality of buses with different voltage levels, namely the power transmission grid is formed by combining the buses with the different voltage levels, a power distribution transformer substation is arranged between the buses with the different voltage levels, and protection switches are arranged in front of and behind the buses with the different voltage levels, when the power transmission grid breaks down, the buses behind the fault position are disconnected from the fault position by the action of the protection switches, and then the buses behind the fault position enter into a isolated network running state powered by power generation equipment in the local area. The method comprises the steps of determining the position of faults to be performed in the step, and further judging the power generation equipment in the isolated network running state and the bus needing grid connection operation.
Further, in step 110, the following steps may be included:
step 111, acquiring the switch states of protection switches of buses with different voltage levels under a fault power grid;
in this embodiment, the states of the protection switches corresponding to the buses with different voltage levels under the fault power grid are obtained, and whether the buses are in a fault state or not is further judged through the on-off states of the protection switches, so that the buses in a isolated grid operation state can be further judged.
And 112, judging that the bus which is in the isolated network running state and has faults is used as the bus to be connected.
And acquiring the switching state of the protection switch under the fault power grid in the steps, and acquiring the running state of each bus under the fault power grid, so as to judge the position of the bus with the fault and the bus in the isolated grid running state at the moment. That is, the position where the protection switch operates is a position where a fault occurs, so that the bus having the fault can be determined, and the power generation equipment of the subsequent bus can be determined to be in the isolated network operation state.
In other embodiments, the bus in the isolated network operation state may be determined in other manners, so as to obtain the location of the bus with the grid connection, for example, the bus may be obtained according to the working state of each section of bus, or the working state of each power generation device, etc.
And 120, determining a target automatic quasi-synchronization device of the different domains based on the positions of the buses to be connected.
In the embodiment of the invention, after the position of the bus to be connected is judged, an automatic quasi-synchronization device which can be borrowed in the bus with the voltage level behind the bus to be connected is needed to be determined according to the position of the bus to be connected, and then the automatic quasi-synchronization device is utilized to realize the grid connection operation of the bus to be connected.
And 130, determining a bus where the target automatic quasi-synchronization device is located as a reference bus.
The reference bus is herein a bus in the electric network to be incorporated, i.e. a bus in the electric network to be incorporated that is connected to the target automatic quasi-synchronization device.
The automatic quasi-synchronization is formed by integrating a time program and a logic circuit according to a certain control strategy by utilizing the principles of frequency difference detection, differential pressure detection and constant lead time, and can satisfactorily complete basic requirements of quasi-synchronization and parallel. The automatic quasi-synchronization device is a special automatic device. The voltage difference and the frequency difference are automatically monitored, the proper synchronization moment is analyzed and calculated, a closing command is sent out in advance by a lead time, synchronization grid connection is guaranteed to be completed at an ideal angle, the circuit breaker is enabled to be closed at a phase angle difference of 0 degree, and the microcomputer automatic quasi-synchronization device can complete grid connection at the same phase point for the first time after starting synchronization.
And 140, adjusting the operation parameters of the target bus with the same voltage level as the reference bus under the fault power grid, so that the difference value between the operation parameters of the target bus and the operation parameters of the reference bus is within a preset first preset range.
In the embodiment of the invention, when the bus to be connected with the grid is integrated into the reference bus, the frequency, the voltage, the phase sequence, the phase and other operation parameters of the reference bus and the target bus are required to be adjusted, so that the operation parameters of the target bus and the reference bus are within a certain difference range, no impact is formed when the target bus is integrated into the reference bus, the stability of the power grid under the fault power grid and the power grid to be integrated is ensured, and the impact fault possibly caused by the grid connection action is avoided.
In one example, step 140 may include the steps of:
step 141, obtaining a voltage level of the reference bus as a reference level.
In a specific implementation, the voltage level of the reference bus may be obtained by directly obtaining the operation parameter of the reference bus, or may be obtained by other means, which are not listed herein. The voltage class is the voltage class of the reference bus where the automatic quasi-synchronization device located in the different domain is located to be incorporated into the grid.
And 142, determining a bus with the same voltage level as the reference level of the fault power grid as a target bus based on the reference level.
After the reference bus is determined, the voltage level of the corresponding position under the fault power grid can be obtained based on the voltage level of the reference bus. That is to say the target busbar at the other end of the automatic quasi-contemporaneous device connection. In other ways, the reference bus and the target bus may also be determined according to the connection condition of the automatic quasi-synchronization device.
Step 143, obtaining a reference load of the reference bus and an initial load of the target bus.
The reference load of the reference bus and the initial load of the target bus can be obtained by obtaining load data monitored by a background monitoring device, or the load of the buses on both sides collected based on an automatic quasi-synchronization device is used as the reference load and the initial load, or other collection points or collection modes are adopted for obtaining the load, and the load is not repeated herein.
Step 144, adjusting the initial load based on the reference load so that the difference between the initial load and the reference load is within a preset load range.
In specific implementation, the overall load of the target bus under the fault power grid needs to be adjusted, so that the difference value between the initial load of the reference target bus and the reference load of the bus is within a certain range, and the loads on two sides of the automatic quasi-synchronization device are ensured to meet the grid connection requirement.
In one specific example, step 144 may include the steps of:
and 1441, when the initial load is larger than the reference load, disabling the preset equipment of the bus to be connected in the isolated network running state.
When the initial load of the target bus positioned on the fault electric network is larger than the reference load of the reference bus to be integrated under the electric network, the load of the target bus needs to be reduced, and at the moment, the load under the fault electric network can be reduced by disabling part of equipment under the fault electric network. The part of the equipment to be deactivated may be preset equipment with less influence on production and life, namely the preset equipment in the step.
And 1442, reducing the power supply of the generator of the bus to be connected in the isolated network running state when the initial load is smaller than the reference load.
When the initial load of the target bus on the fault power grid is smaller than the reference load of the reference bus to be integrated under the power grid, the load of the target bus under the fault power grid needs to be increased, and the method can be used for reducing the power source of the power generation equipment in the isolated network running state under the fault power grid, so that the generated energy of the power generation equipment is reduced, the load of the target bus is increased, and the load balance between the target bus and the reference bus is adjusted.
Step 145, obtaining the reference frequency of the reference bus and the initial frequency of the target bus.
The reference frequency of the reference bus and the initial frequency of the target bus can be obtained by obtaining frequency data monitored by a background monitoring device, or the frequencies of the buses on two sides collected by the automatic quasi-synchronization device are used as the reference frequency and the initial frequency, or other collection points or collection modes are adopted for obtaining, and the description is omitted herein.
Step 146, adjusting the initial frequency based on the reference frequency, so that the difference between the initial frequency and the reference frequency is within a preset frequency range.
In specific implementation, the overall frequency of the target bus under the fault power grid needs to be adjusted so that the difference value between the initial frequency of the reference target bus and the reference frequency of the bus is within a certain range, and therefore the frequencies of the two sides of the automatic quasi-synchronization device are guaranteed to meet the grid connection requirement.
In one specific example, step 146 may include the steps of:
step 1461, when the initial frequency is greater than the reference frequency, reducing the power supply of the generator of the bus to be connected with the grid, which increases the isolated grid operation state.
When the initial frequency of the target bus bar positioned on the fault electric network is larger than the reference frequency of the reference bus bar to be incorporated under the electric network, the frequency of the target bus bar needs to be reduced, and the power supply of the power generation equipment under the fault electric network can be reduced, so that the frequency under the fault electric network is reduced.
Step 1462, when the initial frequency is smaller than the reference frequency, increasing the power supply of the generator of the bus to be connected in the isolated network running state.
When the initial frequency of the target bus bar positioned on the fault electric network is smaller than the reference frequency of the reference bus bar to be incorporated under the electric network, the frequency of the target bus bar needs to be increased, and the power supply of the power generation equipment under the fault electric network can be increased at this time, so that the frequency under the fault electric network is increased.
Step 147, obtaining the reference voltage of the reference bus and the initial voltage of the target bus.
The reference voltage of the reference bus and the initial voltage of the target bus can be obtained by obtaining voltage data monitored by a background monitoring device, or the voltages of the buses on two sides collected based on an automatic quasi-synchronization device are used as the reference voltage and the initial voltage, or other collection points or collection modes are adopted for obtaining, and the description is omitted herein.
Step 148, adjusting the initial voltage based on the reference voltage so that the difference between the initial voltage and the reference voltage is within a preset voltage range.
In specific implementation, the overall voltage of the target bus under the fault power grid needs to be adjusted so that the difference value between the initial voltage of the reference target bus and the reference voltage of the bus is within a certain range, and the voltage at two sides of the automatic quasi-synchronization device is ensured to meet the grid connection requirement.
In one specific example, step 148 may include the steps of:
step 1481, when the initial voltage is greater than the reference voltage, reducing the excitation output of the generator;
step 1482, when the initial voltage is less than the reference voltage, increases the excitation output of the generator.
In the specific implementation, the reference voltage of the reference bus and the initial voltage of the target bus can be adjusted by adjusting the excitation output of the power generation equipment under the fault power grid, specifically, when the initial voltage of the target bus is higher than the reference voltage of the reference bus, the excitation output of the generator is reduced, and when the initial voltage of the target bus is lower than the reference voltage of the reference bus, the excitation output of the generator is increased.
And 150, sending out a synchronization instruction to the target automatic quasi-synchronization device.
And in the step, the difference value of the operation parameters of the target bus under the fault power grid and the reference bus to be integrated into the power grid is regulated to be within a certain range, a synchronization instruction is sent to the target automatic quasi-synchronization device, the target automatic quasi-synchronization device can monitor real-time data of the target bus and the reference bus in real time, and when the parameters of the target bus and the reference bus are consistent, the target bus and the reference bus are communicated through action, so that the fault power grid realizes synchronization grid connection operation through the target automatic quasi-synchronization device arranged under the target bus.
And 160, after the completion of the closing of the target automatic quasi-synchronization device is detected, sending a closing command to a grid-connected switch corresponding to the bus to be grid-connected.
After the target automatic quasi-synchronization device is switched on and the target bus and the reference bus are connected, a grid-connected switch arranged between the bus to be connected and the power grid to be integrated can be operated to be closed, and the bus to be connected and the power grid to be integrated are connected, so that the isolated network running state of the power generation equipment is relieved. The equipment under the fault power grid can obtain a stable power supply environment.
Optionally, after sending a closing command to a grid-connected switch corresponding to the bus to be grid-connected, the method further includes:
and after the grid connection of the grid-connected buses is successful, the target automatic quasi-synchronization device is driven to be de-looped.
In specific implementation, after the target automatic quasi-synchronization device under the target bus of the different domain is used for completing the grid connection between the bus to be connected and the power grid which normally operates under the fault power grid, the borrowed target automatic quasi-synchronization device needs to be withdrawn, so that after the completion of the grid connection is determined, a ring-releasing command needs to be sent to the target automatic quasi-synchronization device, the target automatic quasi-synchronization device is separated from the grid connection state, and the state before the borrowing is recovered.
Specifically, it may include:
detecting the working state of a grid-connected switch corresponding to a bus to be grid-connected;
detecting input voltage of a bus to be connected;
and issuing a decycling command to the target automatic quasi-synchronization device based on the operating state and the input voltage.
In a specific implementation, as shown in a schematic diagram of a power grid to be integrated and a fault power grid in fig. 1b, a line between a #2 main transformer 120 of a 220kV transformer substation of the fault power grid and a 35kV regional transformer substation is in fault, a protection switch 302 and a 4F10 of the fault power grid act to disconnect the connection between the 35kV regional transformer substation and the 220kV transformer substation, a 35kV2 section is a bus to be grid-connected in the embodiment of the present invention, a #4 generator of the 35kV regional transformer substation and a region after the 35kV regional transformer substation are powered by a #4 generator of the 35kV regional transformer substation, the #4 generator is in a isolated network running state, and an automatic quasi-synchronization device 304 connected with the #4 generator is in an operating state and is not available for grid connection with the power grid to be integrated, so that the automatic quasi-synchronization device 5012-3 at a different domain (10 kV power station) needs to be used as a target automatic quasi-synchronization device in the embodiment to achieve grid connection. Specifically, the 10kV1 section is used as a reference bus, the 10kV2 section is used as a target bus for grid connection operation, after the 10kV1 section and the 10kV2 section are connected in a grid through an automatic quasi-synchronization device 5012-3, a grid connection switch 3012-2 corresponding to the 35kV2 section of the bus to be connected in the grid is closed, and finally the automatic quasi-synchronization device 5012-3 is separated, so that grid connection of the 35kV2 section of the bus to be connected in the grid and the 35kV2 section to be connected in the grid can be completed by means of the automatic quasi-synchronization device 5012-3 of the different domains, and the isolated grid operation state of the #4 generator is relieved.
In this embodiment, by acquiring the target automatic quasi-synchronization device located at the different domain position, adjusting the operation parameters of the reference bus and the target bus to be integrated into the power grid under the fault power grid at the same voltage level as the target automatic quasi-synchronization device, and adjusting the operation parameters of the reference bus according to the operation parameters of the target bus, the difference between the operation parameters of the target bus and the operation parameters of the reference bus is within a preset first preset range, so that the difference between the power environment of the fault power grid and the power environment to be integrated into the power grid can be effectively reduced, the instant large impact current is avoided during grid connection, the stability of the fault power grid and the power grid to be integrated into is effectively ensured, the large-scale grid disconnection caused by the grid connection release of the grid connection operation state is avoided, and the influence and loss during grid connection release are effectively reduced.
It should be noted that, for simplicity of description, the method embodiments are shown as a series of acts, but it should be understood by those skilled in the art that the embodiments are not limited by the order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred embodiments, and that the acts are not necessarily required by the embodiments of the invention.
Example two
Fig. 2 is a block diagram of a device for removing a foreign domain in isolated network operation according to a second embodiment of the present invention. The device comprises: the device comprises an acquisition module 21, a target determination module 22, a reference determination module 23, an adjustment module 24, a synchronization module 25 and a closing module 26. Wherein:
the obtaining module 21 is configured to obtain a position of a bus to be connected in a isolated network operation state of a fault power grid, where the fault power grid includes a plurality of buses with different voltage levels;
the target determining module 22 is used for determining a target automatic quasi-synchronization device of the different domains based on the position of the bus to be grid-connected;
a reference determining module 23, configured to determine a bus where the target automatic quasi-synchronization device is located as a reference bus; the adjusting module 24 is configured to adjust an operation parameter of a target bus having the same voltage level as the reference bus under the fault power network, so that a difference value between the operation parameter of the target bus and the operation parameter of the reference bus is within a preset first preset range;
a synchronization module 25, configured to issue a synchronization instruction to the target automatic quasi-synchronization device;
and the closing module 26 is used for sending a closing command to a grid-connected switch corresponding to the bus to be connected after the closing of the target automatic quasi-synchronization device is detected.
A protection switch is arranged between buses with different voltage levels on the transmission line for connection, and the protection switch is disconnected when a fault power grid breaks down;
the acquisition module 21 includes:
the switch state acquisition unit is used for acquiring the switch states of the protection switches of the buses with different voltage levels under the fault power grid;
and the bus to be connected with the network determines the bus which is in the isolated network running state and is in fault based on the switching state as the bus to be connected with the network.
The adjustment module 24 includes:
the reference grade obtaining unit is used for obtaining the voltage grade of the reference bus and taking the voltage grade as the reference grade;
a target bus determining unit for determining a bus of the fault power grid with the same voltage level as the reference level as a target bus based on the reference level;
an initial load acquisition unit for acquiring a reference load of the reference bus and an initial load of the target bus;
a load adjustment unit for adjusting the initial load based on the reference load so that a difference between the initial load and the reference load is within a preset load range;
an initial frequency acquisition unit for acquiring a reference frequency of a reference bus and an initial frequency of a target bus;
the frequency adjusting unit is used for adjusting the initial frequency based on the reference frequency so that the difference value between the initial frequency and the reference frequency is within a preset frequency range;
an acquisition unit for acquiring a reference voltage of a reference bus and an initial voltage of a target bus;
the voltage adjusting unit is used for adjusting the initial voltage based on the reference voltage so that the difference value between the initial voltage and the reference voltage is within a preset voltage range.
The load adjustment unit includes:
the load disabling subunit is used for disabling the preset equipment of the bus to be connected in the isolated network running state when the initial load is larger than the reference load;
and the load reduction subunit is used for reducing the power supply of the generator of the bus to be connected in the isolated network running state when the initial load is smaller than the reference load.
The frequency adjustment unit includes:
the frequency reduction subunit is used for reducing the power supply of the generator of the bus to be connected in the isolated network running state when the initial frequency is greater than the reference frequency;
and the frequency increasing subunit is used for increasing the power supply of the generator of the bus to be connected in the isolated network running state when the initial frequency is smaller than the reference frequency.
The voltage adjustment unit includes:
a voltage sub-reducing unit for reducing excitation output of the generator when the initial voltage is greater than the reference voltage;
and the voltage sub-increasing unit is used for increasing the excitation output of the generator when the initial voltage is smaller than the reference voltage.
Further comprises:
the grid-connected switch detection module is used for detecting the working state of a grid-connected switch corresponding to a bus to be grid-connected;
the grid-connected voltage detection module is used for detecting the input voltage of the bus to be grid-connected;
and the decycling module is used for sending a decycling command to the target automatic quasi-synchronization device based on the working state and the input voltage.
The isolated network operation abnormal domain removing device provided by the embodiment can be used for executing the isolated network operation abnormal domain removing method provided by the first embodiment and the second embodiment, and has corresponding functions and beneficial effects.
Example III
Fig. 3 is a schematic structural diagram of a device for removing a foreign domain in isolated network operation according to a third embodiment of the present invention. As shown in fig. 3, the electronic device includes a processor 30, a memory 31, a communication module 32, an input device 33, and an output device 34; the number of processors 30 in the electronic device may be one or more, one processor 30 being taken as an example in fig. 3; the processor 30, the memory 31, the communication module 32, the input means 33 and the output means 34 in the electronic device may be connected by a bus or other means, in fig. 3 by way of example.
The memory 31 is a computer-readable storage medium, and may be used to store a software program, a computer-executable program, and modules, such as modules corresponding to a method for clearing a foreign domain in a orphan operation in the present embodiment (for example, the acquisition module 21, the target determination module 22, the reference determination module 23, the adjustment module 24, the synchronization module 25, and the closing module 26 in a device for clearing a foreign domain in a orphan operation). The processor 30 executes various functional applications and data processing of the electronic device by running software programs, instructions and modules stored in the memory 31, that is, implements a method for removing a foreign domain of isolated network operation as described above.
The memory 31 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for functions; the storage data area may store data created according to the use of the electronic device, etc. In addition, the memory 31 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some examples, memory 31 may further include memory remotely located relative to processor 30, which may be connected to the electronic device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
And the communication module 32 is used for establishing connection with the display screen and realizing data interaction with the display screen. The input means 33 may be used for receiving entered numeric or character information and for generating key signal inputs related to user settings and function control of the electronic device.
The electronic device provided by the embodiment of the invention can execute the isolated network operation abnormal domain removing method provided by any embodiment of the invention, and the method has the specific corresponding functions and beneficial effects.
Example IV
The fourth embodiment of the present invention also provides a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform a method for performing isolated operation foreign domain cancellation, the method comprising:
receiving fault information of a subway system fault, wherein the fault information comprises a fault phenomenon and equipment types;
determining a solution of the subway system fault according to the fault phenomenon and the equipment type, wherein the solution comprises a professional type;
and sending the solution and the fault information to a first maintenance person so that the first maintenance person can maintain the subway system fault, wherein the professional type of the first maintenance person is consistent with the professional type included in the solution.
Of course, the storage medium containing the computer executable instructions provided in the embodiments of the present invention is not limited to the above-mentioned method operations, and may also perform the related operations in the isolated network operation abnormal domain removal method provided in any embodiment of the present invention.
From the above description of embodiments, it will be clear to a person skilled in the art that the present invention may be implemented by means of software and necessary general purpose hardware, but of course also by means of hardware, although in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, etc., and include several instructions for causing a computer electronic device (which may be a personal computer, a server, or a network electronic device, etc.) to execute the method according to the embodiments of the present invention.
It should be noted that, in the embodiment of the isolated network operation abnormal domain removing device, each unit and module included are only divided according to the functional logic, but are not limited to the above-mentioned division, so long as the corresponding functions can be realized; in addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present invention.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. 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, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. The isolated network operation abnormal domain removing method is characterized by comprising the following steps of:
acquiring the position of a bus to be connected in a grid-connected state of a fault power grid in a grid-isolated operation state, wherein the fault power grid comprises a plurality of buses with different voltage levels;
determining an available automatic quasi-synchronization device which is different from the position of the bus to be connected as a target automatic quasi-synchronization device of a different domain based on the position of the bus to be connected;
determining a bus where the target automatic quasi-synchronization device is located as a reference bus;
adjusting the operation parameters of a target bus with the same voltage level as the reference bus under the fault power grid, so that the difference value between the operation parameters of the target bus and the operation parameters of the reference bus is within a preset first preset range;
sending out a synchronization instruction to the target automatic quasi-synchronization device;
after the completion of the closing of the target automatic quasi-synchronization device is detected, a closing command is sent to a grid-connected switch corresponding to the bus to be grid-connected.
2. The isolated network operation abnormal domain releasing method according to claim 1, wherein a protection switch is arranged between buses with different voltage levels on a power transmission line for connection, and the protection switch is disconnected when the fault power grid breaks down;
the obtaining the position of the bus to be connected with the grid in the isolated network operation state of the fault power grid comprises the following steps:
acquiring the switch states of protection switches of buses with different voltage levels under a fault power grid;
and judging that the bus which is in the isolated network running state and has faults is used as the bus to be connected.
3. The isolated network operation abnormal domain removing method according to claim 1, wherein said adjusting the operation parameter of the target bus having the same voltage level as the reference bus under the fault power network to make the difference between the operation parameter of the target bus and the operation parameter of the reference bus be within a preset first preset range comprises:
acquiring the voltage grade of the reference bus as a reference grade;
determining a bus with the same voltage level as the reference level of the fault power grid as a target bus based on the reference level;
acquiring a reference load of the reference bus and an initial load of the target bus;
adjusting the initial load based on the reference load so that a difference between the initial load and the reference load is within a preset load range;
acquiring the reference frequency of the reference bus and the initial frequency of the target bus;
adjusting the initial frequency based on the reference frequency so that the difference value between the initial frequency and the reference frequency is within a preset frequency range;
acquiring a reference voltage of the reference bus and an initial voltage of the target bus;
and adjusting the initial voltage based on the reference voltage so that the difference value between the initial voltage and the reference voltage is within a preset voltage range.
4. The isolated grid operation abnormal domain removal method according to claim 3, wherein the adjusting the target load of the target bus based on the reference load so that the difference between the target load and the reference load is within a preset load range comprises:
when the initial load is larger than the reference load, disabling the preset equipment of the bus to be connected in the isolated network running state;
and when the initial load is smaller than the reference load, reducing the power supply of the generator of the bus to be connected in the isolated network operation state.
5. The isolated network operation abnormal domain removal method according to claim 3, wherein the adjusting the initial frequency based on the reference frequency so that the difference between the initial frequency and the reference frequency is within a preset frequency range comprises:
when the initial frequency is larger than the reference frequency, reducing the power supply of the generator of the bus to be connected in the isolated network running state;
and when the initial frequency is smaller than the reference frequency, increasing the power supply of the generator of the bus to be connected in the isolated network running state.
6. The isolated network operation abnormal domain removal method according to claim 3, wherein the adjusting the initial voltage based on the reference voltage so that the difference between the initial voltage and the reference voltage is within a preset voltage range comprises:
reducing the excitation output of the generator when the initial voltage is greater than the reference voltage;
and when the initial voltage is smaller than the reference voltage, increasing the excitation output of the generator.
7. The isolated grid operation abnormal domain releasing method according to claim 1, further comprising, after the sending of the closing command to the grid-connected switch corresponding to the bus to be grid-connected:
detecting the working state of a grid-connected switch corresponding to the bus to be grid-connected;
detecting the input voltage of the bus to be connected;
and issuing a decycling command to the target automatic quasi-synchronization device based on the operating state and the input voltage.
8. The utility model provides a isolated network operation foreign domain remove device which characterized in that includes:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the position of a bus to be connected with a grid in a state of isolated grid operation of a fault power grid, and the fault power grid comprises a plurality of buses with different voltage levels;
the target determining module is used for determining an available automatic quasi-synchronization device which is different from the position of the bus to be connected as a target automatic quasi-synchronization device of a different domain based on the position of the bus to be connected;
the reference determining module is used for determining a bus where the target automatic quasi-synchronization device is located as a reference bus;
the adjusting module is used for adjusting the operation parameters of the target bus with the same voltage level as the reference bus under the fault power grid, so that the difference value between the operation parameters of the target bus and the operation parameters of the reference bus is within a preset first preset range;
the synchronization module is used for sending a synchronization instruction to the target automatic quasi-synchronization device;
and the switching-on module is used for sending a switching-on command to a grid-connected switch corresponding to the bus to be grid-connected after the completion of switching-on of the target automatic quasi-synchronization device is detected.
9. A isolated network operation foreign domain removal device, the device comprising:
one or more processors;
storage means for storing one or more programs,
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the isolated network operation heterodomain cancellation method of any one of claims 1-7.
10. A storage medium containing computer executable instructions which, when executed by a computer processor, are for performing the isolated network operation heterodomain resolution method of any one of claims 1-7.
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