CN113241741B - DC line protection method, device and equipment for preventing AC fault from being started by mistake - Google Patents
DC line protection method, device and equipment for preventing AC fault from being started by mistake Download PDFInfo
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- CN113241741B CN113241741B CN202110528146.3A CN202110528146A CN113241741B CN 113241741 B CN113241741 B CN 113241741B CN 202110528146 A CN202110528146 A CN 202110528146A CN 113241741 B CN113241741 B CN 113241741B
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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]
Abstract
The embodiment of the invention relates to a direct current line protection method, a device and equipment for preventing error starting of alternating current faults, wherein the method comprises the following steps: acquiring a local alternating current fault signal, a opposite alternating current fault signal, a direct current voltage and a direct current voltage abrupt change of a direct current transmission system; performing OR operation on the station alternating current fault signal and the station alternating current fault signal to obtain a first fault signal, and performing NOT operation on the first fault signal to obtain a second fault signal; performing abnormality judgment processing on the direct-current voltage and the direct-current voltage abrupt change to obtain abnormal voltage and abnormal abrupt change, and performing AND operation on the abnormal voltage and the abnormal abrupt change to obtain an outlet signal; and performing AND operation on the second fault signal and the outlet signal to obtain a protection action signal. The protection action signal obtained after the AND operation of the second fault signal and the outlet signal is used for starting the direct current line protection, shielding the outlet of direct current voltage mutation protection, and avoiding the situation of direct current line voltage mutation protection misoperation caused by serious alternating current fault.
Description
Technical Field
The present invention relates to the field of dc power transmission systems, and in particular, to a method, an apparatus, and a device for protecting a dc line from false start due to an ac fault.
Background
In the direct current transmission system, because the transmission line is longer, 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 application, when a serious ac fault occurs in the dc transmission system, for example, when a three-phase ground fault occurs on the rectifying side or when a single-phase ground fault occurs on the inverting side, the dc voltage on the transmission line will rapidly drop, which to a certain extent may lead to the abrupt protection malfunction of the original dc voltage, and the abrupt protection malfunction of the dc line voltage may lead to the dc restarting, and the ac fault may affect the bipolar dc voltage of the dc transmission system. In a direct current transmission system, a common direct current is not allowed to restart the dipoles simultaneously, and the direct current bipolar is blocked due to the fact that the dipoles restart simultaneously, so that the direct current transmission system fails. And for the voltage abrupt change protection misoperation of the direct-current line of the monopole, the monopole can be restarted, 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, device and equipment for preventing alternating current fault from being started by mistake, which are used for solving the technical problem that the direct current line protection of the existing power transmission line is easy to be started by mistake and causes the fault of a direct current power transmission system.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
a DC line protection method for preventing error starting of AC fault is applied to a DC transmission system and comprises the following steps:
acquiring a local alternating current fault signal, a opposite alternating current fault signal, a direct current voltage and a direct current voltage abrupt change of a direct current transmission system;
performing OR operation on the station alternating current fault signal and the opposite station alternating current fault signal to obtain a first fault signal, and performing NOT operation on the first fault signal to obtain a second fault signal;
performing abnormality judgment processing on the direct-current voltage and the direct-current voltage abrupt change to obtain abnormal voltage and abnormal abrupt change, and performing AND operation on the abnormal voltage and the abnormal abrupt change to obtain an outlet signal;
and 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, before the self-station alternating current fault signal and the opposite-station alternating current fault signal of the direct current transmission system are obtained, the direct current line protection method for preventing the false start of the alternating current fault comprises the following steps:
acquiring each phase of alternating voltage of the station and each phase of alternating voltage of the opposite station, and calculating through each phase of alternating voltage of the station to obtain three-phase average voltage of the station;
if the alternating current 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, the station outputs an alternating current fault signal of the station;
and if the alternating current of any phase of the opposite station is lower than the third voltage threshold value, outputting an opposite station alternating current fault signal to the opposite station.
Preferably, the first voltage threshold is 0.2p.u, the second voltage threshold is 0.3p.u, and the third voltage threshold is 0.3p.u.
Preferably, performing abnormality judgment processing on the dc voltage and the dc voltage abrupt change amount to obtain an abnormal voltage and an abnormal abrupt change amount 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 abrupt change is larger than the voltage abrupt change threshold, the direct current voltage abrupt change is an abnormal abrupt change.
Preferably, the voltage setting threshold is 0.45p.u, and the voltage abrupt amount threshold is-6 p.u.
The invention also provides a direct current line protection device for preventing the false start of alternating current faults, which is applied to a direct current 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 a local station alternating current fault signal, a station alternating current fault signal, direct current voltage and direct current voltage abrupt change of the direct current 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 NOT operation on the first fault signal to obtain a second fault signal;
the second operation module is used for carrying out abnormality judgment processing on the direct-current voltage and the direct-current voltage abrupt change quantity to obtain an abnormal voltage and an abnormal abrupt change quantity, and carrying out AND operation on the abnormal voltage and the abnormal abrupt change quantity 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 protecting and starting the direct current line.
Preferably, the data acquisition module comprises a voltage acquisition sub-module, a first output module and a second output module;
the voltage acquisition sub-module is used for acquiring each phase of alternating voltage of the station and each phase of alternating voltage of the opposite station, and three-phase average voltage of the station is obtained through calculation of each phase of alternating voltage of the station;
the first output module is used for outputting an alternating current fault signal of the self station according to the fact that the alternating current voltage of any phase of the self station is lower than a first voltage threshold value or the effective value of the three-phase average voltage of the self 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 station according to the fact that the alternating current of any one phase of the opposite-station is lower than a third voltage threshold value.
Preferably, the second operation module comprises a first abnormality judgment module and a second abnormality judgment module;
the first abnormality judgment module is used for setting a threshold value according to the direct current voltage which is smaller than the voltage, and the direct current voltage is an abnormal voltage;
the second abnormality judgment module is configured to determine that the dc voltage abrupt change is an abnormal abrupt change according to the dc voltage abrupt change being greater than a voltage abrupt change threshold.
The invention also provides a computer readable storage medium for storing computer instructions that, when executed on a computer, cause the computer to perform the above-described method for protecting a dc line from false start of an ac fault.
The invention also provides direct current line protection equipment for preventing the false start of alternating current faults, 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 from being started by mistake according to the instructions in the program codes.
From the above technical solutions, the embodiment of the present invention has the following advantages: the direct current line protection method, the direct current line protection device and the direct current line protection equipment for preventing the false start of the alternating current fault are used for acquiring the alternating current fault signal of the direct current transmission system, the opposite station alternating current fault signal, the direct current voltage and the direct current voltage abrupt change; performing OR operation on the station alternating current fault signal and the station alternating current fault signal to obtain a first fault signal, and performing NOT operation on the first fault signal to obtain a second fault signal; performing abnormality judgment processing on the direct-current voltage and the direct-current voltage abrupt change to obtain abnormal voltage and abnormal abrupt change, and performing AND operation on the abnormal voltage and the abnormal abrupt change to obtain an outlet signal; and performing AND operation on the second fault signal and the outlet signal to obtain a protection action signal for protecting and starting the direct current line. The protection action signal obtained after the AND operation is carried out on the second fault signal and the outlet signal, so that the direct-current line protection method for preventing the direct-current line from being started by mistake can be used for starting the direct-current line protection of the direct-current power transmission system, shielding the outlet of direct-current voltage abrupt change protection, avoiding the situation that the direct-current line voltage abrupt change protection is in misoperation when serious alternating-current faults occur, and solving the technical problem that the direct-current power transmission system is in fault because the direct-current line protection of the existing power transmission line is easy to be started by mistake.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a flowchart illustrating steps of a method for protecting a dc line from false start due to ac fault according to an embodiment of the present invention.
Fig. 2 is a logic judgment diagram of a dc line protection method for preventing an ac fault from being started by mistake according to an embodiment of the present invention.
Fig. 3 is a flowchart illustrating another step of a dc line protection method for preventing an ac fault from being started by mistake according to an embodiment of the present invention.
Fig. 4 is a frame diagram of dc voltage surge protection in the dc line protection method for preventing ac fault false start according to the embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the application provides a direct current line protection method, device and equipment for preventing alternating current fault 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, so that the direct current transmission system is failed.
Embodiment one:
fig. 1 is a flow chart of steps of a dc line protection method for preventing an ac fault from being started by mistake according to an embodiment of the present invention, and fig. 2 is a logic judgment chart of the dc line protection method for preventing an ac fault from being started by mistake according to an embodiment of the present invention.
As shown in fig. 1 and fig. 2, an embodiment of the present invention provides a dc line protection method for preventing an ac fault from being started by mistake, which is applied to a dc power transmission system, and includes the following steps:
s10, acquiring a local station alternating current fault signal, a counter station alternating current fault signal, direct current voltage and direct current voltage abrupt change of a direct current transmission system.
In step S10, after an ac fault occurs in the dc power transmission system, data that needs to be determined whether to start dc line protection is obtained. In this embodiment, the present station and the opposite station of the dc power transmission system may be either a rectifying station or an inverting station, and the dc power transmission system is configured by a substation due to protection, that is, the rectifying station and the inverting station each have a set of protection, for example, when the rectifying station is the present station, the inverting station is the opposite station.
S20, performing OR operation on the station alternating current fault signal and the station alternating current fault signal to obtain a first fault signal, and performing NOT operation on the first fault signal to obtain a second fault signal.
In step S20, the ac faults of the local station and the opposite station are mainly logically judged to obtain a second fault signal, and the fault signal is provided for starting the dc line protection, so that the dc restarting caused by the dc line voltage abrupt protection misoperation can be avoided.
S30, performing abnormality judgment processing on the direct-current voltage and the direct-current voltage abrupt change to obtain abnormal voltage and abnormal abrupt change, and performing AND operation on the abnormal voltage and the abnormal abrupt change to obtain an outlet signal.
In step S30, the dc line protection in the prior art mainly uses the dc line voltage abrupt change to logically determine and output the output signal.
S40, performing AND operation on the second fault signal and the outlet signal to obtain a protection action signal for protecting and starting the direct current line.
The protection operation signal is outputted by mainly performing the comprehensive judgment based on the second failure signal and the output signal of step S20 and step S40. In this embodiment, the protection action signal obtained after the and operation of the second fault signal and the output signal is used to start the dc line protection of the dc power transmission system, so as to shield the output of the dc voltage abrupt change protection and avoid the occurrence of the dc line voltage abrupt change protection misoperation during the serious ac fault.
The invention provides a direct current line protection method for preventing the false start of alternating current faults, which is characterized in that the alternating current fault signal, the opposite station alternating current fault signal, the direct current voltage and the direct current voltage abrupt change of a direct current transmission system are obtained; performing OR operation on the station alternating current fault signal and the station alternating current fault signal to obtain a first fault signal, and performing NOT operation on the first fault signal to obtain a second fault signal; performing abnormality judgment processing on the direct-current voltage and the direct-current voltage abrupt change to obtain abnormal voltage and abnormal abrupt change, and performing AND operation on the abnormal voltage and the abnormal abrupt change to obtain an outlet signal; and performing AND operation on the second fault signal and the outlet signal to obtain a protection action signal for protecting and starting the direct current line. The protection action signal obtained after the AND operation is carried out on the second fault signal and the outlet signal, so that the direct-current line protection method for preventing the direct-current line from being started by mistake can be used for starting the direct-current line protection of the direct-current power transmission system, shielding the outlet of direct-current voltage abrupt change protection, avoiding the situation that the direct-current line voltage abrupt change protection is in misoperation when serious alternating-current faults occur, and solving the technical problem that the direct-current power transmission system is in fault because the direct-current line protection of the existing power transmission line is easy to be started by mistake.
Fig. 3 is a flowchart illustrating another step of a dc line protection method for preventing an ac fault from being started by mistake according to an embodiment of the present invention.
As shown in fig. 3, in one embodiment of the present invention, before acquiring a local ac fault signal and a counter ac fault signal of a dc power transmission system, the dc line protection method for preventing the false start of an ac fault includes:
s01, acquiring each phase of alternating voltage of the station and each phase of alternating voltage of the opposite station, and calculating through each phase of alternating voltage of the station to obtain three-phase average voltage of the station;
s02, if the alternating current 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, outputting an alternating current fault signal of the station by the station;
s03, if the alternating current 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 0.3p.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.
The steps S01 to S03 mainly refer to determining an ac fault of the dc transmission system to obtain ac fault signals of the own station and the opposite station.
Fig. 4 is a frame diagram of dc voltage surge protection in the dc line protection method for preventing ac fault false start according to the embodiment of the present invention.
In one embodiment of the present invention, performing abnormality judgment processing on a dc voltage and a dc voltage abrupt change, to obtain an abnormal voltage and an abnormal abrupt change includes:
if the direct current voltage is smaller than the voltage set threshold, the direct current voltage is abnormal voltage;
if the direct current voltage abrupt change is larger than the voltage abrupt change threshold, the direct current voltage abrupt change is an abnormal abrupt change.
The voltage threshold may be 0.45p.u, and the voltage threshold may be-6 p.u. The abnormal judgment processing is carried out on the direct-current voltage and the direct-current voltage abrupt change, so that the abnormal voltage and the abnormal abrupt change are mainly obtained by adopting the basic principle of direct-current line voltage abrupt change protection in the prior art, as shown in fig. 4, the direct-current voltage abrupt change is calculated to be larger than a voltage abrupt change threshold value through a direct-current line voltage measuring point (such as a station 1 pole 1 line S1 UDL) of the station, an output signal is output when the direct-current voltage is lower than a voltage setting threshold value, and the protection action of the direct-current line voltage abrupt change is controlled to be started through the output signal. In other embodiments, the voltage set threshold and the voltage step-up threshold may be defined according to the requirements of the dc power line system itself.
Embodiment two:
the embodiment of the invention also provides a direct current line protection device for preventing the error starting 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 a local alternating current fault signal, an opposite alternating current fault signal, direct current voltage and direct current voltage abrupt change of the direct current transmission system;
the first operation module is used for performing OR operation on the station alternating current fault signal and the station alternating current fault signal to obtain a first fault signal, and performing NOT operation on the first fault signal to obtain a second fault signal;
the second operation module is used for carrying out abnormality judgment processing on the direct-current voltage and the direct-current voltage abrupt change quantity to obtain abnormal voltage and the abnormal abrupt change quantity, and carrying out AND operation on the abnormal voltage and the abnormal abrupt change quantity 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 protecting and starting the direct current line.
In the embodiment of the invention, the data acquisition module comprises a voltage acquisition sub-module, a first output module and a second output module;
the voltage acquisition sub-module is used for acquiring each phase of alternating voltage of the station and each phase of alternating voltage of the opposite station, and calculating through each phase of alternating voltage of the station to obtain three-phase average voltage of the station;
the first output module is used for outputting an alternating current fault signal of the self station according to the fact that the alternating current voltage of any phase of the self station is lower than a first voltage threshold value or the effective value of the three-phase average voltage of the self 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 station according to the fact that the alternating current voltage of any one phase of the opposite station is lower than a third voltage threshold value.
In the embodiment of the invention, the second operation module comprises a first abnormality judgment module and a second abnormality judgment module;
the first abnormality judgment module is used for setting a threshold value according to the fact that the direct current voltage is smaller than the voltage, and the direct current voltage is an abnormal voltage;
the second abnormality judgment module is used for judging the direct current voltage abrupt change amount as an abnormal abrupt change amount according to the fact that the direct current voltage abrupt change amount is larger than a voltage abrupt change amount threshold value.
It should be noted that, the modules in the apparatus of the second embodiment correspond to the steps in the method of the second embodiment, and the steps in the method of the second embodiment are described in detail in the first embodiment, and the details of the modules in the apparatus are not described in detail in the second embodiment.
Embodiment III:
the embodiment of the invention provides a computer readable storage medium, which is used for storing computer instructions, and when the computer readable storage medium runs on a computer, the computer is caused to execute the direct current line protection method for preventing the alternating current fault from being started by mistake.
Embodiment four:
the embodiment of the invention provides direct current line protection equipment for preventing alternating current faults from being started by mistake, which comprises a processor and a memory;
a memory for storing 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 instruction in the program code.
It should be noted that the processor is configured to execute the steps in the embodiment of the dc line protection method for preventing the ac fault from being started by mistake according to the instructions in the program code. In the alternative, the processor, when executing the computer program, performs the functions of the modules/units in the system/apparatus embodiments described above.
For example, a computer program may be split into one or more modules/units, which are stored in a memory and executed by a processor to complete the present application. One or more of the modules/units may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program in the terminal device.
The terminal device may be a computing device such as a desktop computer, a notebook computer, a palm computer, a cloud server, etc. The terminal device may include, but is not limited to, a processor, a memory. It will be appreciated by those skilled in the art that the terminal device is not limited and may include more or less components than those illustrated, or may be combined with certain components, or different components, e.g., the terminal device may also include input and output devices, network access devices, buses, etc.
The processor may be a central processing unit (Central Processing Unit, CPU), other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 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 provided on the terminal device, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), or the like. 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 will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown 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 may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform 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, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A DC line protection method for preventing error starting of AC fault is applied to a DC transmission system and is characterized by comprising the following steps:
acquiring a local alternating current fault signal, a opposite alternating current fault signal, a direct current voltage and a direct current voltage abrupt change of a direct current transmission system;
performing OR operation on the station alternating current fault signal and the opposite station alternating current fault signal to obtain a first fault signal, and performing NOT operation on the first fault signal to obtain a second fault signal;
performing abnormality judgment processing on the direct-current voltage and the direct-current voltage abrupt change to obtain abnormal voltage and abnormal abrupt change, and performing AND operation on the abnormal voltage and the abnormal abrupt change to obtain an outlet signal;
performing AND operation on the second fault signal and the outlet signal to obtain a protection action signal for protecting and starting a direct current line;
before the self-station alternating current fault signal and the opposite-station alternating current fault signal of the direct current transmission system are obtained, the direct current line protection method for preventing the false start of the alternating current fault comprises the following steps:
acquiring each phase of alternating voltage of the station and each phase of alternating voltage of the opposite station, and calculating through each phase of alternating voltage of the station to obtain three-phase average voltage of the station;
if the alternating current 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, the station outputs an alternating current fault signal of the station;
and if the alternating current of any phase of the opposite station is lower than the third voltage threshold value, outputting an opposite station alternating current fault signal to the opposite station.
2. The method of claim 1, wherein the first voltage threshold is 0.2p.u, the second voltage threshold is 0.3p.u, and the third voltage threshold is 0.3p.u.
3. The method for protecting a dc link against false start due to ac fault as set forth in claim 1, wherein performing abnormality judgment processing on the dc voltage and the dc voltage abrupt change amount to obtain an abnormal voltage and an abnormal abrupt change amount 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 abrupt change is larger than the voltage abrupt change threshold, the direct current voltage abrupt change is an abnormal abrupt change.
4. The method of claim 3, wherein the voltage set threshold is 0.45p.u and the voltage spike threshold is-6 p.u.
5. The direct current line protection device for preventing the false start of alternating current faults is applied to a direct current 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 a local station alternating current fault signal, a station alternating current fault signal, direct current voltage and direct current voltage abrupt change of the direct current 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 NOT operation on the first fault signal to obtain a second fault signal;
the second operation module is used for carrying out abnormality judgment processing on the direct-current voltage and the direct-current voltage abrupt change quantity to obtain an abnormal voltage and an abnormal abrupt change quantity, and carrying out AND operation on the abnormal voltage and the abnormal abrupt change quantity to obtain an outlet signal;
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 protecting and starting the direct current line;
the data acquisition module comprises a voltage acquisition sub-module, a first output module and a second output module;
the voltage acquisition sub-module is used for acquiring each phase of alternating voltage of the station and each phase of alternating voltage of the opposite station, and three-phase average voltage of the station is obtained through calculation of each phase of alternating voltage of the station;
the first output module is used for outputting an alternating current fault signal of the self station according to the fact that the alternating current voltage of any phase of the self station is lower than a first voltage threshold value or the effective value of the three-phase average voltage of the self 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 station according to the fact that the alternating current of any one phase of the opposite-station is lower than a third voltage threshold value.
6. The device for protecting a dc link against false start due to ac fault as set forth in claim 5, wherein said second operation module includes a first abnormality determination module and a second abnormality determination module;
the first abnormality judgment module is used for setting a threshold value according to the direct current voltage which is smaller than the voltage, and the direct current voltage is an abnormal voltage;
the second abnormality judgment module is configured to determine that the dc voltage abrupt change is an abnormal abrupt change according to the dc voltage abrupt change being greater than a voltage abrupt change threshold.
7. A computer readable storage medium storing computer instructions which, when run on a computer, cause the computer to perform the ac fault false start protection method according to any one of claims 1 to 4.
8. The direct current line protection device for preventing the false start of alternating current faults 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 dc line protection method for preventing false start of ac fault according to any one of claims 1 to 4 according to the instructions in the program code.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN106058826B (en) * | 2016-06-03 | 2018-08-17 | 南京南瑞继保电气有限公司 | A kind of mixed type DC transmission system receiving end exchange side fault handling method |
| CN107863758B (en) * | 2016-11-02 | 2019-07-16 | 东北电力大学 | The improved method of MMC DC voltage protection |
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