CN113241741A - Direct-current line protection method, device and equipment for preventing false start of alternating-current fault - Google Patents
Direct-current line protection method, device and equipment for preventing false start of alternating-current fault Download PDFInfo
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- CN113241741A CN113241741A CN202110528146.3A CN202110528146A CN113241741A CN 113241741 A CN113241741 A CN 113241741A CN 202110528146 A CN202110528146 A CN 202110528146A CN 113241741 A CN113241741 A CN 113241741A
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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
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
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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 embodiment of the invention relates to a direct current line protection method, a device and equipment for preventing false start of alternating current faults, wherein the method comprises the following steps: acquiring a local station alternating current fault signal, a station-to-station alternating current fault signal, direct current voltage and a direct current voltage sudden change of a direct current power transmission system; carrying out OR operation on the station alternating current fault signal and the station alternating current fault signal to obtain a first fault signal, and carrying out non-operation on the first fault signal to obtain a second fault signal; carrying out abnormity judgment processing on the direct current voltage and the direct current voltage sudden change to obtain an abnormal voltage and an abnormal sudden change, and carrying out AND operation on the abnormal voltage and the abnormal sudden change to obtain an outlet signal; and the second fault signal and the outlet signal are subjected to AND operation to obtain a protection action signal. According to the method, the protection action signal obtained after the AND operation is carried out on the second fault signal and the outlet signal starts the protection of the direct current line, the outlet of the direct current voltage abrupt change protection is shielded, and the condition that the voltage abrupt change protection of the direct current line is mistakenly operated when the alternating current fault is serious is avoided.
Description
Technical Field
The invention relates to the technical field of direct-current power transmission systems, in particular to a direct-current line protection method, device and equipment for preventing false start of alternating-current faults.
Background
In the direct-current transmission system, because the transmission line is long, the direct-current line fault accounts for 50% of the total fault proportion of the direct-current transmission system, and therefore the transmission line is controlled by adopting direct-current line protection.
The existing direct current line protection mainly comprises direct current line traveling wave protection and direct current voltage abrupt change protection. However, in practical applications, when a serious ac fault occurs in the dc power transmission system, such as a three-phase ground fault on a rectification side or a single-phase or three-phase ground fault on an inversion side, the dc voltage on the power transmission line will drop rapidly, which may cause sudden change protection malfunction of the original dc voltage to a certain extent, and the sudden change protection malfunction of the dc line voltage may cause dc restart, and the ac fault may affect the bipolar dc voltage of the dc power transmission system. In a direct-current transmission system, common direct current does not allow simultaneous restarting of the double poles, and the direct-current transmission system fails due to blocking of the direct-current double poles caused by simultaneous restarting of the double poles. And for the voltage sudden change protection misoperation of the unipolar direct current line, the unipolar restart can be caused, so that the output power of the direct current transmission system is greatly fluctuated.
Disclosure of Invention
The embodiment of the invention provides a direct current line protection method, a direct current line protection device and direct current line protection equipment for preventing alternating current fault false start, which are used for solving the technical problem that the direct current transmission system fault is caused because the false start is easy to occur in the direct current line protection of the existing transmission line.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
a direct current line protection method for preventing false start of alternating current faults is applied to a direct current transmission system and comprises the following steps:
acquiring a local station alternating current fault signal, a station-to-station alternating current fault signal, direct current voltage and a direct current voltage sudden change of a direct current power transmission system;
carrying out OR operation on the local station alternating current fault signal and the opposite station alternating current fault signal to obtain a first fault signal, and carrying out non-operation on the first fault signal to obtain a second fault signal;
carrying out abnormity judgment processing on the direct-current voltage and the direct-current voltage mutation quantity to obtain an abnormal voltage and an abnormal mutation quantity, and carrying out AND operation on the abnormal voltage and the abnormal mutation quantity to obtain an outlet signal;
and calculating the second fault signal and the outlet signal to obtain a protection action signal for starting the direct current line protection.
Preferably, before the ac fault signal of the local station and the ac fault signal of the opposite station of the dc power transmission system are obtained, the method for protecting the dc line from the ac fault and the false start includes:
acquiring each alternating current voltage of the station and each alternating current voltage of the opposite station, and calculating each alternating current voltage of the station to obtain three-phase average voltage of the station;
if the alternating voltage of any phase of the local station is lower than a first voltage threshold value or the effective value of the three-phase average voltage of the local station is lower than a second voltage threshold value, the local station outputs an alternating current fault signal of the local station;
and if the alternating voltage of any phase of the opposite station is lower than the third voltage threshold value, the opposite station outputs an opposite station alternating current fault signal.
Preferably, the first voltage threshold is 0.2p.u, the second voltage threshold is 0.3p.u, and the third voltage threshold is 0.3 p.u.
Preferably, the step of performing an abnormality determination process on the dc voltage and the dc voltage sudden change amount to obtain an abnormal voltage and an abnormal sudden change amount includes:
if the direct current voltage is smaller than a voltage set threshold, the direct current voltage is an abnormal voltage;
and if the direct current voltage sudden change amount is larger than the voltage sudden change amount threshold value, the direct current voltage sudden change amount is an abnormal sudden change amount.
Preferably, the voltage setting threshold is 0.45p.u, and the voltage jump threshold is-6 p.u.
The invention also provides a direct current line protection device for preventing the false start of the alternating current fault, which is applied to a direct current power transmission system and comprises a data acquisition module, a first operation module, a second operation module and a third operation module;
the data acquisition module is used for acquiring an AC fault signal of a local station, an AC fault signal of a station, a DC voltage and a DC voltage sudden change of the DC power transmission system;
the first operation module is used for performing OR operation on the local station alternating current fault signal and the opposite station alternating current fault signal to obtain a first fault signal, and performing non-operation on the first fault signal to obtain a second fault signal;
the second operation module is used for performing abnormity judgment processing on the direct-current voltage and the direct-current voltage mutation to obtain an abnormal voltage and an abnormal mutation, and performing AND operation on the abnormal voltage and the abnormal mutation to obtain an outlet signal;
and the third operation module is used for performing AND operation on the second fault signal and the outlet signal to obtain a protection action signal for starting the protection of the direct-current line.
Preferably, the data acquisition module comprises a voltage acquisition submodule, a first output module and a second output module;
the voltage acquisition submodule is used for acquiring each alternating current voltage of the station and each alternating current voltage of the opposite station, and obtaining the three-phase average voltage of the station through calculation of each alternating current voltage of the station;
the first output module is used for outputting an AC fault signal of the station according to the condition that the AC voltage of any phase of the station is lower than a first voltage threshold value or the effective value of the three-phase average voltage of the station is lower than a second voltage threshold value;
and the second output module is used for outputting an opposite station alternating current fault signal to the opposite station according to the condition that the alternating current voltage of any phase of the opposite station is lower than a third voltage threshold.
Preferably, the second operation module includes a first abnormality judgment module and a second abnormality judgment module;
the first abnormity judgment module is used for judging that the direct current voltage is abnormal voltage according to the fact that the direct current voltage is smaller than a voltage set threshold;
and the second abnormality judgment module is used for judging that the direct-current voltage sudden change is an abnormal sudden change according to the fact that the direct-current voltage sudden change is larger than a voltage sudden change threshold value.
The present invention also provides a computer-readable storage medium, which is used for storing computer instructions, and when the computer instructions are run on a computer, the computer is enabled to execute the above-mentioned method for protecting a dc line against an ac fault and a false start.
The invention also provides a direct current line protection device for preventing the false start of the alternating current fault, which comprises a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the direct current line protection method for preventing the alternating current fault and the false start according to the instruction in the program code.
According to the technical scheme, the embodiment of the invention has the following advantages: the method, the device and the equipment for protecting the direct current line from the false start of the alternating current fault acquire an alternating current fault signal of a local station, an alternating current fault signal of a station, direct current voltage and a sudden change of the direct current voltage of a direct current power transmission system; carrying out OR operation on the station alternating current fault signal and the station alternating current fault signal to obtain a first fault signal, and carrying out non-operation on the first fault signal to obtain a second fault signal; carrying out abnormity judgment processing on the direct-current voltage and the direct-current voltage sudden change to obtain an abnormal voltage and an abnormal sudden change, and carrying out AND operation on the abnormal voltage and the abnormal sudden change to obtain an outlet signal; and the second fault signal and the outlet signal are subjected to AND operation to obtain a protection action signal for starting the direct current line protection. According to the direct-current line protection method for preventing the false start of the alternating-current fault, the direct-current line protection of the direct-current power transmission system is started through the protection action signal obtained after the AND operation of the second fault signal and the outlet signal, the outlet of the direct-current voltage abrupt change protection is shielded, the situation that the direct-current line voltage abrupt change protection is mistakenly operated when the alternating-current fault is serious is avoided, and the technical problem that the direct-current line protection of the existing power transmission line is easily mistakenly started to cause the fault of the direct-current power transmission system is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart illustrating steps of a method for protecting a dc line from an ac fault and a false start according to an embodiment of the present invention.
Fig. 2 is a logic judgment diagram of the dc line protection method for preventing false start due to ac fault according to the embodiment of the present invention.
Fig. 3 is a flowchart of another step of the method for protecting a dc line from ac fault false start according to the embodiment of the present invention.
Fig. 4 is a block diagram of the dc voltage inrush quantity protection in the dc line protection method for preventing the false start of the ac fault according to the embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below 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. 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 invention.
The embodiment of the application provides a direct current line protection method, a direct current line protection device and direct current line protection equipment for preventing alternating current faults from being started by mistake, which are applied to a direct current transmission system and solve the technical problem that the direct current line protection of the existing transmission line is easy to be started by mistake to cause faults of the direct current transmission system.
The first embodiment is as follows:
fig. 1 is a flowchart illustrating steps of a dc line protection method for preventing an ac fault from being erroneously started according to an embodiment of the present invention, and fig. 2 is a logic determination diagram illustrating the dc line protection method for preventing an ac fault from being erroneously started according to an embodiment of the present invention.
As shown in fig. 1 and fig. 2, an embodiment of the present invention provides a method for protecting a dc line from an ac fault and an ac false start, which is applied to a dc power transmission system, and includes the following steps:
s10, acquiring an AC fault signal of a local station, an AC fault signal of a station, a DC voltage and a DC voltage sudden change of the DC power transmission system.
In step S10, mainly after an ac fault occurs in the dc power transmission system, data is acquired that needs to be determined whether or not to start the dc line protection. In this embodiment, the local station and the opposite station of the dc transmission line system may be a rectifying station or an inverting station, and the dc transmission line system is configured as a substation due to protection, that is, the rectifying station and the inverting station have a set of protection respectively, for example, when the rectifying station is the local station, the inverting station is the opposite station.
S20, carrying out OR operation on the local station alternating current fault signal and the opposite station alternating current fault signal to obtain a first fault signal, and carrying out non-operation on the first fault signal to obtain a second fault signal.
It should be noted that, in step S20, the ac faults of the local station and the opposite station are mainly logically determined to obtain a second fault signal, so as to provide a fault signal for starting the dc line protection, thereby avoiding the dc restart caused by the dc line voltage sudden change protection malfunction.
And S30, carrying out abnormity judgment processing on the direct-current voltage and the direct-current voltage mutation quantity to obtain an abnormal voltage and an abnormal mutation quantity, and carrying out AND operation on the abnormal voltage and the abnormal mutation quantity to obtain an outlet signal.
It should be noted that, in step S30, the dc line protection in the prior art mainly uses the abrupt change of the dc line voltage to perform logic judgment and output the outlet signal.
And S40, performing AND operation on the second fault signal and the outlet signal to obtain a protection action signal for starting the protection of the direct current line.
The protection operation signal is output mainly by performing the comprehensive determination based on the second failure signal and the exit signal in step S20 and step S40. In this embodiment, the method for protecting a dc line against an ac fault and a false start starts a dc line protection of a dc power transmission system with a protection action signal obtained by performing an and operation on a second fault signal and an outlet signal, and shields an outlet of a dc voltage abrupt change protection, thereby avoiding a situation where a dc line voltage abrupt change protection is mistaken in a severe ac fault.
The invention provides a direct current line protection method for preventing false start of alternating current faults, which is characterized in that a local station alternating current fault signal, a station-to-station alternating current fault signal, direct current voltage and a direct current voltage abrupt change of a direct current power transmission system are obtained; carrying out OR operation on the station alternating current fault signal and the station alternating current fault signal to obtain a first fault signal, and carrying out non-operation on the first fault signal to obtain a second fault signal; carrying out abnormity judgment processing on the direct-current voltage and the direct-current voltage sudden change to obtain an abnormal voltage and an abnormal sudden change, and carrying out AND operation on the abnormal voltage and the abnormal sudden change to obtain an outlet signal; and the second fault signal and the outlet signal are subjected to AND operation to obtain a protection action signal for starting the direct current line protection. According to the direct-current line protection method for preventing the false start of the alternating-current fault, the direct-current line protection of the direct-current power transmission system is started through the protection action signal obtained after the AND operation of the second fault signal and the outlet signal, the outlet of the direct-current voltage abrupt change protection is shielded, the situation that the direct-current line voltage abrupt change protection is mistakenly operated when the alternating-current fault is serious is avoided, and the technical problem that the direct-current line protection of the existing power transmission line is easily mistakenly started to cause the fault of the direct-current power transmission system is solved.
Fig. 3 is a flowchart of another step of the method for protecting a dc line from ac fault false start according to the embodiment of the present invention.
As shown in fig. 3, in an embodiment of the present invention, before acquiring the ac fault signal of the local station and the ac fault signal of the opposite station of the dc power transmission system, the method for protecting the dc line against the false start of the ac fault includes:
s01, obtaining each alternating current voltage of the station and each alternating current voltage of the opposite station, and calculating to obtain the three-phase average voltage of the station through each alternating current voltage of the station;
s02, if the alternating voltage of any phase of the local station is lower than a first voltage threshold value or the effective value of the three-phase average voltage of the local station is lower than a second voltage threshold value, outputting an alternating current fault signal of the local station by the local station;
and S03, if the alternating current voltage of any phase of the opposite station is lower than a third voltage threshold value, outputting an opposite station alternating current fault signal to the opposite station.
In the embodiment of the present invention, the first voltage threshold may be 0.2p.u, the second voltage threshold may be 0.3p.u, and the third voltage threshold may be 0.3 p.u. In other embodiments, the first voltage threshold, the second voltage threshold, and the third voltage threshold may be set according to the requirements of the dc power transmission system itself.
It should be noted that, in steps S01 to S03, ac fault signals of the station and the counter station are mainly obtained by determining ac fault of the dc power transmission system.
Fig. 4 is a block diagram of the dc voltage inrush quantity protection in the dc line protection method for preventing the false start of the ac fault according to the embodiment of the present invention.
In an embodiment of the present invention, the processing of the abnormality determination on the dc voltage and the dc voltage abrupt change to obtain the abnormal voltage and the abnormal abrupt change includes:
if the direct current voltage is smaller than the voltage set threshold, the direct current voltage is abnormal voltage;
and if the direct current voltage sudden change amount is larger than the voltage sudden change amount threshold value, the direct current voltage sudden change amount is an abnormal sudden change amount.
The voltage setting threshold may be 0.45p.u, and the voltage step threshold may be-6 p.u. The method mainly comprises the steps of carrying out abnormity judgment processing on direct-current voltage and direct-current voltage sudden change to obtain abnormal voltage and abnormal sudden change, and mainly based on the existing basic principle of direct-current line voltage sudden change protection in the field, as shown in fig. 4, calculating that the direct-current voltage sudden change is larger than a voltage sudden change threshold value through a direct-current line voltage measuring point (such as a 1-pole 1 line S1UDL) of a station, and outputting an outlet signal if the direct-current voltage is lower than a voltage set threshold value, and controlling the start of the direct-current line voltage sudden change protection action through the output outlet signal. In other embodiments, the voltage setting threshold and the voltage step-up threshold may be defined according to the requirements of the dc power line system itself.
Example two:
the embodiment of the invention also provides a direct current line protection device for preventing the false start of the alternating current fault, which comprises a data acquisition module, a first operation module, a second operation module and a third operation module;
the data acquisition module is used for acquiring an AC fault signal of a local station, an AC fault signal of a station, a DC voltage and a DC voltage sudden change of a DC power transmission system;
the first operation module is used for carrying out OR operation on the station alternating current fault signal and the opposite station alternating current fault signal to obtain a first fault signal, and carrying out non-operation on the first fault signal to obtain a second fault signal;
the second operation module is used for carrying out abnormity judgment processing on the direct-current voltage and the direct-current voltage mutation to obtain abnormal voltage and abnormal mutation, and carrying out AND operation on the abnormal voltage and the abnormal mutation to obtain an outlet signal;
and the third operation module is used for performing AND operation on the second fault signal and the outlet signal to obtain a protection action signal for starting the direct-current line protection.
In the embodiment of the invention, the data acquisition module comprises a voltage acquisition submodule, a first output module and a second output module;
the voltage acquisition submodule is used for acquiring each alternating current voltage of the station and each alternating current voltage of the opposite station, and obtaining the three-phase average voltage of the station through calculation of each alternating current voltage of the station;
the first output module is used for outputting an AC fault signal of the station according to the condition that the AC voltage of any phase of the station is lower than a first voltage threshold value or the effective value of the three-phase average voltage of the station is lower than a second voltage threshold value;
and the second output module is used for outputting the station-to-station alternating current fault signal according to the condition that the alternating current voltage of any phase of the station-to-station is lower than the third voltage threshold.
In the embodiment of the invention, the second operation module comprises a first abnormity judgment module and a second abnormity judgment module;
the first abnormity judgment module is used for judging that the direct current voltage is abnormal voltage according to the fact that the direct current voltage is smaller than a voltage set threshold;
and the second abnormality judgment module is used for judging that the direct-current voltage mutation is an abnormal mutation according to the fact that the direct-current voltage mutation is larger than the voltage mutation threshold.
It should be noted that the modules in the second embodiment correspond to the steps in the first embodiment, and the steps in the first embodiment have been described in detail in the first embodiment, and the contents of the modules in the second embodiment are not described in detail in this second embodiment.
Example three:
the embodiment of the invention provides a computer-readable storage medium, which is used for storing computer instructions and enabling a computer to execute the above direct-current line protection method for preventing the false start of the alternating-current fault when the computer instructions run on the computer.
Example four:
the embodiment of the invention provides direct-current line protection equipment for preventing false start of alternating-current faults, which comprises a processor and a memory, wherein the processor is used for processing the direct-current line protection equipment;
a memory for storing the program code and transmitting the program code to the processor;
and the processor is used for executing the direct current line protection method for preventing the false start of the alternating current fault according to the instructions in the program codes.
It should be noted that the processor is configured to execute the steps in the above-mentioned embodiment of the dc line protection method against ac fault false start according to the instructions in the program code. Alternatively, the processor, when executing the computer program, implements the functions of each module/unit in each system/apparatus embodiment described above.
Illustratively, a computer program may be partitioned into one or more modules/units, which are stored in a memory and executed by a processor to accomplish the present application. One or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of a computer program in a terminal device.
The terminal device may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal device may include, but is not limited to, a processor, a memory. Those skilled in the art will appreciate that the terminal device is not limited and may include more or fewer components than those shown, or some components may be combined, or different components, e.g., the terminal device may also include input output devices, network access devices, buses, etc.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage may be an internal storage unit of the terminal device, such as a hard disk or a memory of the terminal device. The memory may also be an external storage device of the terminal device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like provided on the terminal device. Further, the memory may also include both an internal storage unit of the terminal device and an external storage device. The memory is used for storing computer programs and other programs and data required by the terminal device. The memory may also be used to temporarily store data that has been output or is to be output.
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 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-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will 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 of the embodiments of the present invention.
Claims (10)
1. A direct current line protection method for preventing false start of alternating current fault is applied to a direct current transmission system and is characterized by comprising the following steps:
acquiring a local station alternating current fault signal, a station-to-station alternating current fault signal, direct current voltage and a direct current voltage sudden change of a direct current power transmission system;
carrying out OR operation on the local station alternating current fault signal and the opposite station alternating current fault signal to obtain a first fault signal, and carrying out non-operation on the first fault signal to obtain a second fault signal;
carrying out abnormity judgment processing on the direct-current voltage and the direct-current voltage mutation quantity to obtain an abnormal voltage and an abnormal mutation quantity, and carrying out AND operation on the abnormal voltage and the abnormal mutation quantity to obtain an outlet signal;
and calculating the second fault signal and the outlet signal to obtain a protection action signal for starting the direct current line protection.
2. The method according to claim 1, wherein before the ac fault signal of the local station and the ac fault signal of the opposite station of the dc power transmission system are obtained, the method comprises:
acquiring each alternating current voltage of the station and each alternating current voltage of the opposite station, and calculating each alternating current voltage of the station to obtain three-phase average voltage of the station;
if the alternating voltage of any phase of the local station is lower than a first voltage threshold value or the effective value of the three-phase average voltage of the local station is lower than a second voltage threshold value, the local station outputs an alternating current fault signal of the local station;
and if the alternating voltage of any phase of the opposite station is lower than the third voltage threshold value, the opposite station outputs an opposite station alternating current fault signal.
3. The method of claim 2, wherein the first voltage threshold is 0.2p.u, the second voltage threshold is 0.3p.u, and the third voltage threshold is 0.3 p.u.
4. The method for protecting a dc line from ac fault false start according to claim 1, wherein the step of performing an abnormality determination process on the dc voltage and the dc voltage transient, and obtaining an abnormal voltage and an abnormal transient includes:
if the direct current voltage is smaller than a voltage set threshold, the direct current voltage is an abnormal voltage;
and if the direct current voltage sudden change amount is larger than the voltage sudden change amount threshold value, the direct current voltage sudden change amount is an abnormal sudden change amount.
5. The method according to claim 4, wherein the voltage setting threshold is 0.45p.u, and the voltage step-up threshold is-6 p.u.
6. A direct current line protection device for preventing false start of alternating current faults is applied to a direct current power transmission system and is characterized by comprising a data acquisition module, a first operation module, a second operation module and a third operation module;
the data acquisition module is used for acquiring an AC fault signal of a local station, an AC fault signal of a station, a DC voltage and a DC voltage sudden change of the DC power transmission system;
the first operation module is used for performing OR operation on the local station alternating current fault signal and the opposite station alternating current fault signal to obtain a first fault signal, and performing non-operation on the first fault signal to obtain a second fault signal;
the second operation module is used for performing abnormity judgment processing on the direct-current voltage and the direct-current voltage mutation to obtain an abnormal voltage and an abnormal mutation, and performing AND operation on the abnormal voltage and the abnormal mutation to obtain an outlet signal;
and the third operation module is used for performing AND operation on the second fault signal and the outlet signal to obtain a protection action signal for starting the protection of the direct-current line.
7. The ac fault false start prevention dc line protection device of claim 6, wherein said data acquisition module comprises a voltage acquisition submodule, a first output module and a second output module;
the voltage acquisition submodule is used for acquiring each alternating current voltage of the station and each alternating current voltage of the opposite station, and obtaining the three-phase average voltage of the station through calculation of each alternating current voltage of the station;
the first output module is used for outputting an AC fault signal of the station according to the condition that the AC voltage of any phase of the station is lower than a first voltage threshold value or the effective value of the three-phase average voltage of the station is lower than a second voltage threshold value;
and the second output module is used for outputting an opposite station alternating current fault signal to the opposite station according to the condition that the alternating current voltage of any phase of the opposite station is lower than a third voltage threshold.
8. The apparatus according to claim 6, wherein the second operation module comprises a first abnormality judgment module and a second abnormality judgment module;
the first abnormity judgment module is used for judging that the direct current voltage is abnormal voltage according to the fact that the direct current voltage is smaller than a voltage set threshold;
and the second abnormality judgment module is used for judging that the direct-current voltage sudden change is an abnormal sudden change according to the fact that the direct-current voltage sudden change is larger than a voltage sudden change threshold value.
9. A computer-readable storage medium for storing computer instructions which, when run on a computer, cause the computer to perform the method of protecting a dc link against ac fault false start according to any one of claims 1 to 5.
10. A direct current line protection device for preventing false start of alternating current fault is characterized by comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the method for protecting a dc line against ac fault false start according to any one of claims 1 to 5 according to instructions in the program code.
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