CN113364024B - Protection control method, device, terminal and medium for multi-terminal direct-current power transmission system - Google Patents
Protection control method, device, terminal and medium for multi-terminal direct-current power transmission system Download PDFInfo
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- CN113364024B CN113364024B CN202110832451.1A CN202110832451A CN113364024B CN 113364024 B CN113364024 B CN 113364024B CN 202110832451 A CN202110832451 A CN 202110832451A CN 113364024 B CN113364024 B CN 113364024B
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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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- 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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The method comprises the steps of adding a convertor station withdrawing signal generated when any convertor station in the multi-terminal direct-current transmission system performs station withdrawing action, monitoring the convertor station withdrawing signal, outputting a first level signal according to the monitored signal state, and performing logic gate operation on an initial protection control signal and the first level signal through a logic gate circuit, so that the convertor station does not trigger direct-current line restarting action under the condition that the convertor station withdrawing signal is monitored, the direct-current voltage mutation protection misoperation is avoided, and the technical problem that the direct-current voltage mutation protection misoperation easily occurs when the convertor station withdraws from the station in the conventional multi-terminal direct-current transmission system is solved.
Description
Technical Field
The present application relates to the field of dc power transmission technologies, and in particular, to a protection control method, device, terminal, and medium for a multi-terminal dc power transmission system.
Background
The multi-terminal direct current transmission system is a transmission system formed by three or more converter stations in a certain connection mode, when one converter station is out of operation and does not need to be stopped like a flexible direct current transmission system at two ends, the multi-terminal direct current transmission system can still exchange power among other converter stations under the power coordination control, and only the balance working point of the system is shifted. The power supply device not only has the advantage of flexible direct current transmission at two ends, but also has the advantage of realizing multipoint power supply and multipoint power receiving.
When a multi-terminal direct-current power transmission system exits a certain station from a direct-current network, direct-current voltage and direct-current voltage need to be controlled to smaller values due to the limitation of the capacity of a direct-current breaker, and the direct current and the direct-current voltage need to be controlled rapidly when a fault occurs, the direct-current voltage of the system will be reduced rapidly at the moment, so that the direct-current voltage sudden-change protection is prone to be mistakenly operated, the direct-current restarting action is superposed for multiple times, and the stable operation of the system is influenced.
Disclosure of Invention
The application provides a protection control method, a device, a terminal and a medium for a multi-terminal direct current transmission system, which are used for solving the technical problem that the direct current voltage mutation protection maloperation is easy to occur when a converter station moves back in the existing multi-terminal direct current transmission system.
A first aspect of the present application provides a protection control method for a multi-terminal dc power transmission system, including:
acquiring a voltage parameter of a converter station, and obtaining an initial protection control signal according to a comparison result of the voltage parameter and a preset direct-current line restarting action triggering condition;
monitoring a station withdrawing signal of a converter station of the converter station, and outputting a first level signal by combining the corresponding relation between the station withdrawing signal of the converter station and the level signal, wherein the station withdrawing signal of the converter station is a message signal generated when any converter station in the multi-terminal direct-current transmission system performs station withdrawing action;
and performing logic gate operation on the initial protection control signal and the first level signal through a logic gate circuit to obtain a target protection control signal, so as to control the converter station through the target protection control signal, and when monitoring a station withdrawal signal of the converter station, the converter station does not trigger a direct-current line restarting action.
Preferably, the monitoring a converter station withdrawal signal of the converter station, and combining a correspondence between the converter station withdrawal signal and the level signal, outputting the first level signal specifically includes:
monitoring a station withdrawing signal of the converter station, if the station withdrawing signal of the converter station is not monitored in the converter station, outputting a level signal in an initial level state as the first level signal, and if the station withdrawing signal of the converter station is monitored in the converter station, outputting a level signal opposite to that in the initial level state as the first level signal.
Preferably, the initial level state is a low level state.
Preferably, the outputting a level signal opposite to that in the initial level state as the first level signal specifically includes:
and continuously outputting a level signal opposite to that in the initial level state as the first level signal within a preset time length.
Preferably, the preset time period is not less than 2s.
Preferably, the voltage parameters specifically include: voltage abrupt change amount and direct current voltage value.
A second aspect of the present application provides a protection control device for a multi-terminal dc power transmission system, configured to implement a protection control method for the multi-terminal dc power transmission system, where the method includes:
the voltage parameter processing unit is used for acquiring voltage parameters of the converter station and obtaining an initial protection control signal according to a comparison result of the voltage parameters and a preset direct-current line restarting action triggering condition;
the system comprises a converter station withdrawing signal processing unit, a multi-terminal direct current transmission system and a control unit, wherein the converter station withdrawing signal processing unit is used for monitoring a converter station withdrawing signal of a converter station and outputting a first level signal by combining the corresponding relation between the converter station withdrawing signal and a level signal, and the converter station withdrawing signal is a message signal generated when any converter station in the multi-terminal direct current transmission system performs a station withdrawing action;
and the protection control processing unit is used for performing logic gate operation on the initial protection control signal and the first level signal through a logic gate circuit to obtain a target protection control signal so as to control the converter station through the target protection control signal, so that the converter station does not trigger a direct-current circuit restarting action when monitoring a converter station withdrawal signal.
Preferably, when the initial level state of the first level signal is a low level state, the logic gate circuit specifically includes: a not gate and an and gate;
the first input end of the AND gate is used for accessing the initial protection control signal;
the input end of the NOT gate is used for accessing the first level signal, and the output end of the NOT gate is connected with the second input end of the AND gate.
A third aspect of the present application provides a protection control terminal for a multi-terminal dc power transmission system, including: a memory and a processor;
the memory is configured to store a program code, where the program code corresponds to a protection control method for a multi-terminal dc power transmission system as provided in 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 computer-readable storage medium having stored therein program code corresponding to a protection control method for a multi-terminal direct current power transmission system as provided in the first aspect of the present application.
According to the technical scheme, the method has the following advantages:
according to the method, the convertor station withdrawing signal generated when any convertor station in the multi-terminal direct current transmission system performs the convertor station withdrawing action is added, the convertor station withdrawing signal is monitored, the first level signal is output according to the monitored signal state, and the initial protection control signal and the first level signal are subjected to logic gate operation through the logic gate circuit, so that the convertor station does not trigger the direct current circuit to restart the action under the condition that the convertor station withdrawing signal is monitored, and the direct current voltage mutation protection misoperation is avoided.
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 flowchart of an embodiment of a protection control method for a multi-terminal dc power transmission system according to the present application.
Fig. 2 is a logic block diagram of a protection control signal of a protection control method for a multi-terminal dc power transmission system according to the present application.
Fig. 3 is a schematic structural diagram of an embodiment of a protection control device of a multi-terminal dc power transmission system provided in the present application.
Detailed Description
When a multi-terminal direct-current transmission system exits a certain station from a direct-current network, due to the limitation of the capacity of a direct-current breaker, direct-current voltage and direct-current voltage need to be controlled to smaller values, and direct current voltage need to be controlled rapidly when a fault occurs, the direct-current voltage of the system will drop rapidly at the moment, so that direct-current voltage sudden-change protection is prone to malfunction, direct-current line voltage sudden-change protection malfunction can cause direct-current restarting, the pole power can be interrupted for a period of time when the station is exited, the power interruption time can be longer after the direct-current restarting is superposed, a series of system problems can be caused, such as frequency deviation, power shortage, safety and stability device malfunction and the like, and the stable operation of the system is influenced.
The embodiment of the application provides a protection control method, a device, a terminal and a medium for a multi-terminal direct current transmission system, which are used for solving the technical problem that the direct current voltage sudden change protection maloperation is easy to occur when a converter station moves back in the existing multi-terminal direct current transmission system.
In order to make the objects, features and advantages of the present invention more apparent and understandable, the following embodiments of the present invention are clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments of the present invention. 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.
Referring to fig. 1, a first embodiment of the present application provides a protection control method for a multi-terminal dc power transmission system, including:
By using a direct-current line voltage measuring point of the converter station, voltage parameters are obtained through measurement and calculation, and the voltage parameters specifically comprise: when the voltage abrupt change is higher than the abrupt change threshold and the direct current voltage value is lower than the voltage threshold, the voltage abrupt change protection action of the direct current line is triggered to start the line restarting logic.
And 102, monitoring a station returning signal of the converter station, and outputting a first level signal by combining the corresponding relation between the station returning signal of the converter station and the level signal.
More specifically, a station withdrawal signal of the converter station is monitored, if the station withdrawal signal is not monitored at the converter station, the level signal in the initial level state is output as the first level signal, and if the station withdrawal signal is monitored at the converter station, the level signal opposite to that in the initial level state is output as the first level signal. Further, outputting a level signal opposite to that in the initial level state as the first level signal specifically includes: and continuously outputting a level signal opposite to that in the initial level state as a first level signal within a preset time length.
The initial level state is preferably a low level state, and the preset time is not less than 2s.
The station-withdrawing signal of the converter station is a message signal generated when any converter station in the multi-terminal direct-current transmission system performs station-withdrawing actions according to a preset plan or due to faults, and may be generated when a local converter station performs the station-withdrawing actions, or may be generated when a non-local converter station performs the station-withdrawing actions and transmitted through an inter-station communication channel.
And 103, performing logic gate operation on the initial protection control signal and the first level signal through a logic gate circuit to obtain a target protection control signal so as to control the converter station through the target protection control signal, so that the converter station does not trigger a direct-current circuit restarting action when monitoring a converter station withdrawal signal.
And finally, performing logic gate operation on the initial protection control signal and the first level signal to obtain a target protection control signal so as to control the converter station through the target protection control signal, so that the converter station does not trigger the restarting action of the direct current circuit when monitoring a station withdrawal signal of the converter station.
The logical operation relationship among the initial protection control signal, the first level signal and the target protection control signal mentioned in this embodiment is shown in table 1:
| initial protection control signal | First level signal | Target protection control signal |
| 0 | 1 | 0 |
| 1 | 1 | 0 |
| 0 | 0 | 0 |
| 1 | 0 | 1 |
The first level signal represents that the converter station monitors a converter station withdrawing signal, and the first level signal represents that the direct current line restarting action is triggered when the target protection control signal is 1.
The above is a detailed description of an embodiment of a method for controlling protection of a multi-terminal dc power transmission system according to the present application, and the following is a detailed description of an embodiment of a device for controlling protection of a multi-terminal dc power transmission system according to the present application.
Referring to fig. 3, a second embodiment of the present application provides a protection control device for a multi-terminal dc power transmission system, for implementing a protection control method for the multi-terminal dc power transmission system according to the first embodiment of the present application, including:
the voltage parameter processing unit 201 is configured to acquire a voltage parameter of the converter station, and obtain an initial protection control signal according to a comparison result between the voltage parameter and a preset direct-current line restart action trigger condition;
the converter station withdrawing signal processing unit 202 is configured to monitor a converter station withdrawing signal of a converter station, and output a first level signal in combination with a corresponding relationship between the converter station withdrawing signal and a level signal, where the converter station withdrawing signal is a message signal generated when any converter station in the multi-terminal direct-current transmission system performs a station withdrawing action;
and the protection control processing unit 203 is configured to perform a logic gate operation on the initial protection control signal and the first level signal through a logic gate circuit to obtain a target protection control signal, so as to control the converter station through the target protection control signal, so that the converter station does not trigger a restart action of the dc link when monitoring a station withdrawal signal of the converter station.
As shown in fig. 2, when the initial level state of the first level signal is a low level state, the logic gate circuit specifically includes: a not gate and an and gate;
the first input end of the AND gate is used for accessing an initial protection control signal;
the input end of the NOT gate is used for accessing the first level signal, and the output end of the NOT gate is connected with the second input end of the AND gate.
The output first level signal is negated, and then the negated first level signal and the initial protection control signal are subjected to AND operation, so that the direct-current station-quitting protection action is avoided.
In addition, a third embodiment of the present application provides a protection control terminal for a multi-terminal dc power transmission system, including: a memory and a processor;
the memory is used for storing program codes, and the program codes correspond to a protection control method of the multi-terminal direct current power transmission system provided by the first embodiment of the application;
the processor is used for executing the program codes.
A fourth embodiment of the present application provides a computer-readable storage medium, in which program codes corresponding to the protection control method for a multi-terminal dc power transmission system as provided in the first embodiment of the present application are stored.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the terminal, the apparatus and the unit described above 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 terminal, 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 (10)
1. A protection control method of a multi-terminal direct-current power transmission system is characterized by comprising the following steps:
acquiring a voltage parameter of a converter station, and obtaining an initial protection control signal according to a comparison result of the voltage parameter and a preset direct-current line restarting action triggering condition;
monitoring a station withdrawing signal of a converter station of the converter station, and outputting a first level signal by combining the corresponding relation between the station withdrawing signal of the converter station and the level signal, wherein the station withdrawing signal of the converter station is a message signal generated when any converter station in the multi-terminal direct-current transmission system performs station withdrawing action;
and performing logic gate operation on the initial protection control signal and the first level signal through a logic gate circuit to obtain a target protection control signal so as to control the converter station through the target protection control signal, so that the converter station does not trigger a direct-current line restarting action when monitoring a converter station withdrawal signal.
2. The method according to claim 1, wherein the monitoring a converter station withdrawal signal of the converter station, and the outputting the first level signal in combination with a corresponding relationship between the converter station withdrawal signal and the level signal specifically includes:
monitoring a station withdrawing signal of the converter station, if the station withdrawing signal of the converter station is not monitored in the converter station, outputting a level signal in an initial level state as the first level signal, and if the station withdrawing signal of the converter station is monitored in the converter station, outputting a level signal opposite to that in the initial level state as the first level signal.
3. The method according to claim 2, wherein the initial level state is a low level state.
4. The method according to claim 2, wherein outputting a level signal opposite to that in an initial level state as the first level signal specifically comprises:
and continuously outputting a level signal opposite to that in the initial level state as the first level signal within a preset time length.
5. The protection control method for the multi-terminal direct current transmission system according to claim 4, wherein the preset time period is not less than 2s.
6. The method according to claim 1, wherein the voltage parameters specifically include: voltage abrupt change amount and direct current voltage value.
7. A protection control device for a multi-terminal dc power transmission system, for implementing a protection control method for a multi-terminal dc power transmission system according to any one of claims 1 to 6, comprising:
the voltage parameter processing unit is used for acquiring voltage parameters of the converter station and obtaining an initial protection control signal according to a comparison result of the voltage parameters and a preset direct-current line restarting action triggering condition;
the station withdrawing signal processing unit is used for monitoring a station withdrawing signal of a converter station of the converter station, and outputting a first level signal by combining the corresponding relation between the station withdrawing signal of the converter station and a level signal, wherein the station withdrawing signal of the converter station is a message signal generated when any converter station in the multi-terminal direct-current transmission system performs station withdrawing action;
and the protection control processing unit is used for performing logic gate operation on the initial protection control signal and the first level signal through a logic gate circuit to obtain a target protection control signal so as to control the converter station through the target protection control signal, so that the converter station does not trigger a direct-current circuit restarting action when monitoring a converter station withdrawal signal.
8. The protection control device for a multi-terminal dc power transmission system according to claim 7, wherein when the initial level state of the first level signal is a low level state, the logic gate circuit specifically includes: a not gate and an and gate;
the first input end of the AND gate is used for accessing the initial protection control signal;
and the input end of the NOT gate is used for accessing the first level signal, and the output end of the NOT gate is connected with the second input end of the AND gate.
9. A protection control terminal of a multi-terminal direct current transmission system, comprising: a memory and a processor;
the memory is used for storing program codes, and the program codes correspond to a protection control method of the multi-terminal direct current power transmission system according to any one of claims 1 to 6;
the processor is configured to execute the program code.
10. A computer-readable storage medium having stored therein program code corresponding to a method of protection control of a multi-terminal dc power transmission system according to any one of claims 1 to 6.
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| CN111463762A (en) * | 2020-04-10 | 2020-07-28 | 中国南方电网有限责任公司 | Multi-terminal high-voltage direct-current power transmission system composite fault coordination handling method, device and terminal |
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| CN112865094B (en) * | 2021-03-11 | 2022-12-06 | 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 |
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| CN111463762A (en) * | 2020-04-10 | 2020-07-28 | 中国南方电网有限责任公司 | Multi-terminal high-voltage direct-current power transmission system composite fault coordination handling method, device and terminal |
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