CN112202153A - Multi-terminal direct current power transmission system locking control method, device, terminal and medium - Google Patents
Multi-terminal direct current power transmission system locking control method, device, terminal and medium Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The application discloses a locking control method, a device, a terminal and a medium of a multi-terminal direct current transmission system, and provides a shutdown locking strategy for adding preset delay after receiving all signals of a running station of an emergency shutdown aiming at the phenomenon that a fault-free receiving-end converter station is possibly locked before the power of a rectifier station is reduced in the prior art, so that the technical problem that overvoltage is generated due to improper coordination of shutdown time sequences of all stations and further devices or equipment are damaged is solved, and the safety of all running converter stations of the emergency shutdown after faults in multi-terminal direct current engineering is improved.
Description
Technical Field
The application relates to the technical field of high-voltage power transmission, in particular to a locking control method, device, terminal and medium for a multi-terminal direct-current power transmission system.
Background
With the progress of the high-voltage direct-current technology, the use of a multi-terminal direct-current transmission system becomes more and more extensive, and the current multi-terminal direct-current transmission system generally comprises a transmitting-terminal converter station and a plurality of receiving-terminal converter stations.
After the pole layer protection action of a certain pole of a certain converter station, in order to protect equipment of the station, the station is required to be locked immediately, and meanwhile, a control system sends out tripping flexible direct-current transformer breaker and pole isolation operation. In the two-end system, any station has a fault, the protection outlet pole is locked, and then the two stations are locked, so that the system is completely stopped. However, in a multi-terminal system including a dc breaker/high speed parallel switch (HSS) switch, it is necessary to distinguish whether a fault can be isolated by the dc breaker/HSS switch. For isolatable faults, only the station needs to be stopped, and non-fault stations recover to operate; for the non-isolatable fault, all on-site stops. Thus, an electrode layer protective latch signals other stations whether a fault can isolate itself or all of its active stations.
In practical applications, however, the shutdown of a plurality of local transport stations often causes an overvoltage phenomenon, which seriously harms the safety of the system and the equipment.
Disclosure of Invention
The application provides a locking control method, device, terminal and medium for a multi-terminal direct current transmission system, which are used for solving the technical problems that overvoltage phenomena often occur when a plurality of current multi-terminal direct current transmission systems are stopped and are in operation, and the safety of the systems and equipment is seriously damaged.
First, a first aspect of the present application provides a blocking control method for a multi-terminal dc power transmission system, which is applied to a fault-free receiving-terminal converter, and includes:
in response to the receiving of a fault locking instruction, calculating a first delay value according to a sending time node contained in the fault locking instruction, wherein the fault locking instruction is a fault processing instruction sent by a fault receiving end converter when a receiving end converter has a fault, and the first delay value is communication delay of the fault locking instruction sent from the fault receiving end converter to the local;
calculating a second delay value according to the information of the fault receiving end converter and by combining a preset system topological structure, wherein the second delay value is obtained by calculating the communication delay between the fault receiving end converter and the transmitting end converter station;
when the first delay value is larger than the second delay value, locking operation is executed;
and when the first delay value is not greater than the second delay value, the locking operation is executed after the first preset time length is delayed.
Preferably, the configuration process of the second delay value specifically includes:
calculating standard communication delay from the fault receiving end converter to the transmitting end converter station according to the information of the fault receiving end converter and a preset system topological structure;
and obtaining the second delay value according to the sum of the standard communication delay and the sending end power reduction delay, wherein the sending end locking delay is the delay from the time when the sending end converter receives the fault locking instruction to the time when the sending end converter finishes power reduction processing.
Preferably, the configuration process of the first preset duration specifically includes:
and calculating a difference value between the second delay value and the first delay value, and determining the first preset time length according to the difference value, wherein the first preset time length is greater than the difference value.
The present application provides in a second aspect a multi-terminal dc power transmission system locking control device, which is arranged on a receiving-terminal converter of a multi-terminal dc power transmission system, and includes:
the first delay value calculating unit is used for responding to the receiving of a fault locking instruction, and calculating a first delay value according to a sending time node contained in the fault locking instruction, wherein the fault locking instruction is a fault processing instruction sent by a fault receiving end converter when the receiving end converter has a fault, and the first delay value is communication delay of the fault locking instruction sent from the fault receiving end converter to the local;
the second delay value calculating unit is used for calculating a second delay value according to the information of the fault receiving end converter and by combining a preset system topological structure, wherein the second delay value is obtained by calculating the communication delay between the fault receiving end converter and the transmitting end converter station;
a first control unit for performing a latch operation when the first delay value is greater than the second delay value;
and the second control unit is used for delaying the first preset time length and then executing locking operation when the first delay value is not greater than the second delay value.
Preferably, the second delay unit calculating unit is specifically configured to:
calculating standard communication delay from the fault receiving end converter to the transmitting end converter station according to the information of the fault receiving end converter and a preset system topological structure;
and obtaining the second delay value according to the sum of the standard communication delay and the sending end power reduction delay, wherein the sending end locking delay is the delay from the time when the sending end converter receives the fault locking instruction to the time when the sending end converter finishes power reduction processing.
Preferably, the configuration process of the first preset duration specifically includes:
and calculating a difference value between the second delay value and the first delay value, and determining the first preset time length according to the difference value, wherein the first preset time length is greater than the difference value.
A third aspect of the present application provides a multi-terminal dc power transmission system locking control terminal, including: a memory and a processor;
the memory is configured to store program codes corresponding to the multi-terminal dc power transmission system blocking control method according to the first aspect of the present application;
the processor is configured to execute the program code.
A fourth aspect of the present application provides a storage medium having stored therein program code corresponding to the method for blocking control of a multi-terminal dc power transmission system according to the first aspect of the present application.
According to the technical scheme, the embodiment of the application has the following advantages:
the application provides a multi-terminal direct current transmission system locking control method, which is applied to a receiving-terminal converter and comprises the following steps: in response to the receiving of a fault locking instruction, calculating a first delay value according to a sending time node contained in the fault locking instruction, wherein the fault locking instruction is a fault processing instruction sent by a fault receiving end converter when a receiving end converter has a fault, and the first delay value is communication delay of the fault locking instruction sent from the fault receiving end converter to the local; calculating a second delay value according to the information of the fault receiving end converter and by combining a preset system topological structure, wherein the second delay value is obtained by calculating the communication delay between the fault receiving end converter and the transmitting end converter station; when the first delay value is larger than the second delay value, locking operation is executed; and when the first delay value is not greater than the second delay value, the locking operation is executed after the first preset time length is delayed.
The shutdown locking strategy is provided, the preset delay is added after all signals in the converter station are received in emergency shutdown, the phenomenon that the converter station is locked before the power of the rectifier station is reduced without a fault at a receiving end is avoided, the problem that the shutdown time sequence of each station is not properly matched to generate an overvoltage phenomenon, and then the technical problem that devices or equipment are damaged is solved, and the safety of all the converter stations in operation in emergency shutdown after the fault in multi-end direct current engineering is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic circuit architecture diagram of a multi-terminal dc power transmission system according to the present application;
fig. 2 is a schematic flow chart of a blocking control method of a multi-terminal dc power transmission system according to the present application.
Fig. 3 is a schematic diagram illustrating a blocking execution flow of a multi-terminal dc power transmission system based on a multi-terminal dc power transmission system blocking control method provided in the present application;
fig. 4 is a schematic structural diagram of a blocking control device of a multi-terminal dc power transmission system according to the present application.
Detailed Description
After the pole layer protection action of a certain pole of a certain converter station, in order to protect equipment of the station, the station pole is locked immediately, and meanwhile, a control system sends out tripping connection transformer circuit breakers and pole isolation operation. In the two-end system, any station has a fault, the protection outlet pole is locked, and then the two stations are locked, so that the system is completely stopped. However, in a multi-terminal system including a dc breaker/high speed parallel switch (HSS) switch, it is necessary to distinguish whether a fault can be isolated by the dc breaker/HSS switch. For isolatable faults, only the station needs to be stopped, and non-fault stations recover to operate; for the non-isolatable fault, all on-site stops. Thus, an electrode layer protective latch signals other stations whether a fault can isolate itself or all of its active stations.
However, in practical applications, such as hybrid multi-terminal dc engineering, due to the differences in the operation and control characteristics between conventional dc and flexible dc and the differences in the communication delays between stations, for "shutdown of all stations in the local area", if the shutdown timings of the stations are not properly matched, other problems may be caused, thereby affecting the safety of the system and the equipment. For example: in the hybrid three-terminal dc system shown in fig. 1, if a certain receiving-end converter station fails and needs to be locked, and if another receiving-end converter station is locked before the power of the rectifier station is reduced, the energy on the dc side cannot be sent out, which may continuously charge the dc line or the converter valve, resulting in overvoltage and other phenomena, and endangering the safety of the system and the equipment.
In view of this, embodiments of the present application provide a method, an apparatus, a terminal, and a medium for controlling blocking of a multi-terminal dc power transmission system, so as to solve the technical problem that when an existing multi-terminal dc power transmission system is stopped, a plurality of local stations often have an overvoltage phenomenon, which seriously harms the safety of the system and equipment.
In order to make the objects, features and advantages of the present invention more apparent and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the embodiments described below are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The present application adopts an example system as a three-terminal dc system for explaining a multi-terminal dc transmission system blocking control method, as shown in fig. 1, the system includes three converter stations, specifically, a rectifier station and two inverter stations, wherein the rectifier station adopts a conventional dc converter valve LCC, and the two inverter stations both adopt a hybrid modular multilevel converter VSC (1, 2) composed of a full bridge and a half bridge. The valve group comprises a flexible straight valve group and a conventional valve group, the rectifying station is positioned at the sending end converter station, and the flexible straight valve group is positioned at the receiving end converter station.
Referring to fig. 2 and fig. 3, a second embodiment of the present application provides a blocking control method for a multi-terminal dc power transmission system, which is applied to a fault-free receiver-side converter, and includes:
And 102, calculating a second delay value according to the information of the fault receiving end converter and by combining a preset system topological structure, wherein the second delay value is obtained by calculating the communication delay between the fault receiving end converter and the transmitting end converter station.
And 104, executing locking operation.
And 105, delaying the first preset time, and then executing locking operation.
It should be noted that, when a certain receiving-end converter station has a fault, after an electrode layer protection action of a certain pole of a certain converter station, in order to protect equipment of the station, the station should be locked immediately, and the control system sends out a jump transformer incoming line breaker and a pole isolation operation. If all the stations are required to be shut down, corresponding signals are sent to the rest stations.
After receiving a fault signal sent by a certain fault receiving end converter station, the other fault-free receiving end converter stations calculate communication delay from the fault converter station to the station, which is taken as a first delay value x mentioned in this embodiment, then, in combination with the structure and communication parameters of the system, calculate communication delay from the fault converter station to the transmitting end converter station, and on the basis of the communication delay, calculate a second delay value y for representing power reduction delay of the transmitting end converter station, and if the first delay value is greater than the second delay value, it indicates that power reduction locking of the transmitting end converter station has been completed, a locking command may be sent out, so that a control system of the station performs a circuit breaker operation on the ac-tripping side; and if the first delay value is not greater than the second delay value, a locking command is sent after the first preset time z is delayed, and meanwhile, the control system sends out the operation of a circuit breaker at the tripping alternating current side, so that the situation that locking is implemented before the power reduction of the sending end converter station is completed, and the overvoltage phenomenon is caused is avoided.
According to the method and the device, the shutdown locking strategy of adding the preset delay after all in-operation station signals are received in the converter station in the emergency shutdown is provided, the technical problem that overvoltage is generated due to improper shutdown time sequence matching of each station, and further devices or equipment are damaged is solved, and the safety of all in-operation converter stations in the emergency shutdown after the faults in the multi-terminal direct current engineering is improved.
The above is a detailed description of an embodiment of a lock-up control method for a multi-terminal dc power transmission system provided by the present application, and the following is a detailed description of a second embodiment of the lock-up control method for the multi-terminal dc power transmission system provided by the present application.
On the basis of the first embodiment, a second embodiment of the present application provides a method for controlling blocking of a multi-terminal dc power transmission system, including:
more specifically, the more accurate configuration process of the second delay value mentioned in the first embodiment specifically includes:
calculating standard communication delay from the fault receiving end converter to the transmitting end converter station according to the information of the fault receiving end converter and a preset system topological structure;
and obtaining a second delay value according to the sum of the standard communication delay and the sending end power reduction delay, wherein the sending end locking delay is the delay from the time when the sending end converter receives the fault locking instruction to the time when the sending end converter finishes power reduction processing, and the sending end power reduction delay can be obtained through historical power reduction tests.
More specifically, the configuration process of the first preset duration mentioned in the first embodiment specifically includes:
and calculating a difference value between the second delay value and the first delay value, and determining a first preset time length according to the difference value, wherein the first preset time length is greater than the difference value.
The following is a detailed description of an embodiment of a blocking control apparatus for a multi-terminal dc power transmission system provided in the present application.
Referring to fig. 4, a third embodiment of the present application provides a blocking control device for a multi-terminal dc power transmission system, which is disposed in a receiving-terminal converter of the multi-terminal dc power transmission system, and includes:
a first delay value calculation unit 401, configured to, in response to receiving a fault blocking instruction, calculate a first delay value according to a sending time node included in the fault blocking instruction, where the fault blocking instruction is a fault processing instruction sent by a fault receiving end converter when the receiving end converter fails, and the first delay value is a communication delay for sending the fault blocking instruction from the fault receiving end converter to a local location;
a second delay value calculating unit 402, configured to calculate a second delay value according to information of the faulty receiving-end converter and by combining a preset system topology, where the second delay value is calculated according to a communication delay between the faulty receiving-end converter and the transmitting-end converter station;
a first control unit 403 for performing a latch operation when the first delay value is greater than the second delay value;
and a second control unit 404, configured to delay the first preset time period and then perform a locking operation when the first delay value is not greater than the second delay value.
Further, the second delay unit calculating unit 402 is specifically configured to:
calculating standard communication delay from the fault receiving end converter to the transmitting end converter station according to the information of the fault receiving end converter and a preset system topological structure;
and obtaining a second delay value according to the sum of the standard communication delay and the sending end power reduction delay, wherein the sending end locking delay is the delay from the time when the sending end converter receives the fault locking instruction to the time when the sending end converter finishes power reduction processing.
Further, the configuration process of the first preset duration specifically includes:
and calculating a difference value between the second delay value and the first delay value, and determining a first preset time length according to the difference value, wherein the first preset time length is greater than the difference value.
The above is a detailed description of a second embodiment of the multi-terminal dc power transmission system locking control device provided in the present application, and the following is a detailed description of embodiments of the multi-terminal dc power transmission system locking control terminal and the storage medium provided in the present application.
A fourth embodiment of the present application provides a multi-terminal dc power transmission system locking control terminal, including: a memory and a processor;
the memory is used for storing program codes corresponding to the multi-terminal direct-current power transmission system locking control method mentioned in the first embodiment or the second embodiment of the application;
the processor is used for executing the program code to realize the multi-terminal direct current power transmission system locking control method mentioned in the first embodiment or the second embodiment of the application by executing the program code.
A fifth embodiment of the present application provides a storage medium having stored therein program codes corresponding to the method for controlling blocking of a multi-terminal dc power transmission system as set forth in the first or second embodiment of the present application.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The terms "first," "second," "third," "fourth," and the like in the description of the application and the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (8)
1. A multi-terminal direct-current transmission system locking control method is applied to a fault-free receiving-terminal converter and is characterized by comprising the following steps:
in response to the receiving of a fault locking instruction, calculating a first delay value according to a sending time node contained in the fault locking instruction, wherein the fault locking instruction is a fault processing instruction sent by a fault receiving end converter when a receiving end converter has a fault, and the first delay value is communication delay of the fault locking instruction sent from the fault receiving end converter to the local;
calculating a second delay value according to the information of the fault receiving end converter and by combining a preset system topological structure, wherein the second delay value is obtained by calculating the communication delay between the fault receiving end converter and the transmitting end converter station;
when the first delay value is larger than the second delay value, locking operation is executed;
and when the first delay value is not greater than the second delay value, the locking operation is executed after the first preset time length is delayed.
2. The method according to claim 1, wherein the step of configuring the second delay value specifically comprises:
calculating standard communication delay from the fault receiving end converter to a transmitting end converter station according to the information of the fault receiving end converter and a preset system topological structure;
and obtaining the second delay value according to the sum of the standard communication delay and the sending end power reduction delay, wherein the sending end locking delay is the delay from the time when the sending end converter receives the fault locking instruction to the time when the sending end converter finishes power reduction processing.
3. The lock-up control method for the multi-terminal dc power transmission system according to claim 1, wherein the configuration process of the first preset duration specifically includes:
and calculating a difference value between the second delay value and the first delay value, and determining the first preset time length according to the difference value, wherein the first preset time length is greater than the difference value.
4. The utility model provides a multiport direct current transmission system shutting controlling means, sets up the receiving end transverter at multiport direct current transmission system which characterized in that includes:
the first delay value calculating unit is used for responding to the receiving of a fault locking instruction, and calculating a first delay value according to a sending time node contained in the fault locking instruction, wherein the fault locking instruction is a fault processing instruction sent by a fault receiving end converter when the receiving end converter has a fault, and the first delay value is communication delay of the fault locking instruction sent from the fault receiving end converter to the local;
the second delay value calculating unit is used for calculating a second delay value according to the information of the fault receiving end converter and by combining a preset system topological structure, wherein the second delay value is obtained by calculating the communication delay between the fault receiving end converter and the transmitting end converter station;
a first control unit for performing a latch operation when the first delay value is greater than the second delay value;
and the second control unit is used for delaying the first preset time length and then executing locking operation when the first delay value is not greater than the second delay value.
5. The lock-up control device for a multi-terminal dc power transmission system according to claim 4, wherein the second delay unit calculating unit is specifically configured to:
calculating standard communication delay from the fault receiving end converter to the transmitting end converter station according to the information of the fault receiving end converter and a preset system topological structure;
and obtaining the second delay value according to the sum of the standard communication delay and the sending end power reduction delay, wherein the sending end locking delay is the delay from the time when the sending end converter receives the fault locking instruction to the time when the sending end converter finishes power reduction processing.
6. The lock-up control device for a multi-terminal dc power transmission system according to claim 4, wherein the configuration process of the first preset duration specifically includes:
and calculating a difference value between the second delay value and the first delay value, and determining the first preset time length according to the difference value, wherein the first preset time length is greater than the difference value.
7. A multi-terminal DC power transmission system locking control terminal is characterized by comprising: a memory and a processor;
the memory is configured to store program code corresponding to the method of multi-terminal dc power transmission system lock-up control according to any of claims 1 to 3;
the processor is configured to execute the program code.
8. A storage medium having stored therein program code corresponding to the method of blocking control for a multi-terminal dc power transmission system according to any one of claims 1 to 3.
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| CN202011126098.7A CN112202153B (en) | 2020-10-20 | 2020-10-20 | Locking control method, device, terminal and medium for multi-terminal direct current transmission system |
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| CN202011126098.7A CN112202153B (en) | 2020-10-20 | 2020-10-20 | Locking control method, device, terminal and medium for multi-terminal direct current transmission system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112865094A (en) * | 2021-03-11 | 2021-05-28 | 南方电网科学研究院有限责任公司 | Coordination control method and device for restarting low-voltage line of multi-terminal direct-current power transmission system |
| CN115333098A (en) * | 2022-09-20 | 2022-11-11 | 中国南方电网有限责任公司超高压输电公司昆明局 | Method, device and equipment for sequential locking treatment of double valve banks of multi-terminal direct-current power transmission system |
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| CN112865094A (en) * | 2021-03-11 | 2021-05-28 | 南方电网科学研究院有限责任公司 | Coordination control method and device for restarting low-voltage line of multi-terminal direct-current power transmission system |
| CN115333098A (en) * | 2022-09-20 | 2022-11-11 | 中国南方电网有限责任公司超高压输电公司昆明局 | Method, device and equipment for sequential locking treatment of double valve banks of multi-terminal direct-current power transmission system |
| CN115333098B (en) * | 2022-09-20 | 2024-05-31 | 中国南方电网有限责任公司超高压输电公司昆明局 | Method, device and equipment for handling double valve group sequential locking of multi-terminal direct current transmission system |
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