CN113113899B - Direct current transmission line protection method and device and storage medium - Google Patents
Direct current transmission line protection method and device and storage medium Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—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
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for dc systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
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Abstract
The invention discloses a method, a device and a storage medium for protecting a direct current transmission line, wherein under the condition that the air humidity is lower than a first preset temperature, when the voltage of the current direct current transmission line is lower than a preset voltage threshold value, or the current voltage break amount is larger than a preset break amount threshold value, the protection action is carried out; and under the condition that the air humidity is higher than the second preset temperature, when the voltage of the direct current transmission line at each moment in a preset time period is smaller than a preset voltage threshold value, or all voltage sudden change values in the preset time period are larger than a preset sudden change threshold value, protecting the action. The invention also discloses a direct current transmission line protection device and a storage medium. The embodiment of the invention considers the influence of air humidity, selects different strategies according to the air humidity and avoids the protection misoperation of the non-fault lead.
Description
Technical Field
The invention relates to the technical field of power transmission line protection, in particular to a method and a device for protecting a direct current power transmission line and a storage medium.
Background
The direct-current transmission line is generally 1000 kilometers long, the operation condition is severe, line faults are easy to occur, and the operation of a power system is damaged, so that the operation of a direct-current system pole of a corresponding line needs to be stopped under the condition that the direct-current line has a fault.
The conventional protection method for the direct current transmission line generally only judges the current direct current voltage condition, and when the current direct current voltage is lower than a preset voltage value or the change rate of the current direct current voltage is higher than a preset threshold value, the direct current line is judged to have a fault. However, it is not considered that the line coupling effects are different under different air humidities, and when the mutual inductance of the two-pole transmission line is increased and the electromagnetic induction is enhanced, voltage protection of a non-fault pole may be mistakenly operated.
Disclosure of Invention
The embodiment of the invention aims to provide a method, a device and a storage medium for protecting a direct-current transmission line, which consider the influence of air humidity on line coupling so as to ensure that the voltage protection of the line is more accurate.
In order to achieve the above object, an embodiment of the present invention provides a method for protecting a dc transmission line, including:
collecting the voltage of a direct current transmission line;
acquiring air humidity;
when the air humidity is smaller than a first preset humidity and the current voltage of the direct current transmission line is smaller than a preset voltage threshold, or when the air humidity is smaller than the first preset humidity and the current voltage break is larger than a preset break threshold, judging that the direct current transmission line breaks down, and performing protection action;
when the air humidity is greater than a second preset humidity and the voltage of the direct current transmission line at each moment in a preset time period is smaller than a preset voltage threshold, or when the air humidity is greater than the second preset humidity and all the voltage break variables in the preset time period are greater than the preset break variable threshold, judging that the direct current transmission line has a fault and performing protection action; wherein the first preset humidity is less than the second preset humidity.
As an improvement of the above, the method further comprises: and calculating all the voltage break variables in the preset time period according to the voltage of the direct current transmission line at each moment in the preset time period.
As an improvement of the above scheme, when the air humidity is less than a first preset humidity and the current voltage of the dc transmission line is less than a preset voltage threshold, or when the air humidity is less than the first preset humidity and the current voltage break is greater than a preset break threshold, it is determined that the dc transmission line has a fault, and after the protection action, the method further includes:
and when the air humidity rises to be not more than the second preset humidity and the current voltage of the direct current transmission line is smaller than the preset voltage threshold, or when the air humidity rises to be not more than the second preset humidity and the current voltage mutation is larger than the preset mutation threshold, judging that the direct current transmission line breaks down, and performing protection action.
As an improvement of the above scheme, when the air humidity is greater than a second preset humidity and the voltage of the dc transmission line at each time in a preset time period is less than a preset voltage threshold, or when the air humidity is greater than the second preset humidity and all the voltage variables in the preset time period are greater than the preset variable threshold, it is determined that the dc transmission line has a fault, and after the protection action, the method further includes:
when the air humidity is not less than the first preset humidity and the voltage of the direct current transmission line at each moment in a preset time period is less than the preset voltage threshold, or when the air humidity is not less than the first preset humidity and all the voltage break variables in the preset time period are greater than the preset break variable threshold, it is determined that the direct current transmission line breaks down, and a protection action is performed.
In order to achieve the above object, an embodiment of the present invention further provides a protection device for a dc transmission line, including:
the voltage acquisition module is used for acquiring the voltage of the direct current transmission line;
the humidity acquisition module is used for acquiring air humidity;
the first protection action module is used for judging that the direct current transmission line has a fault and performing protection action when the air humidity is smaller than a first preset humidity and the current voltage of the direct current transmission line is smaller than a preset voltage threshold value or when the air humidity is smaller than the first preset humidity and the current voltage sudden change amount is larger than a preset sudden change amount threshold value;
the second protection action module is used for judging that the direct current transmission line breaks down and performing protection action when the air humidity is greater than a second preset humidity and the voltage of the direct current transmission line at each moment in a preset time period is less than a preset voltage threshold value or when the air humidity is greater than the second preset humidity and all voltage break variables in the preset time period are greater than the preset break variable threshold value; wherein the first preset humidity is less than the second preset humidity.
As an improvement of the above scheme, the apparatus further includes a break variable quantity calculation module, configured to calculate all the voltage break quantities within a preset time period according to the voltage of the dc transmission line at each time within the preset time period.
As an improvement of the foregoing solution, the first protection action module is configured to determine that the dc transmission line fails when the air humidity is smaller than a first preset humidity and the current voltage of the dc transmission line is smaller than a preset voltage threshold, or when the air humidity is smaller than the first preset humidity and the current voltage break amount is greater than a preset break amount threshold, and after the protection action, the first protection action module is further configured to:
and when the air humidity rises to be not more than the second preset humidity and the current voltage of the direct current transmission line is less than the preset voltage threshold, or when the air humidity rises to be not more than the second preset humidity and the current voltage break is more than the preset break threshold, judging that the direct current transmission line breaks down, and protecting the direct current transmission line.
As an improvement of the above scheme, the second protection action module is configured to determine that the dc transmission line has a fault when the air humidity is greater than a second preset humidity and the voltage of the dc transmission line at each time in a preset time period is less than a preset voltage threshold, or when the air humidity is greater than the second preset humidity and all the voltage variables in the preset time period are greater than the preset variable threshold, and after the protection action, the second protection action module is further configured to:
when the air humidity is not less than the first preset humidity and the voltage of the direct current transmission line at each moment in a preset time period is less than the preset voltage threshold, or when the air humidity is not less than the first preset humidity and all the voltage break variables in the preset time period are greater than the preset break variable threshold, it is determined that the direct current transmission line breaks down, and a protection action is performed.
In order to achieve the above object, an embodiment of the present invention further provides a storage medium, which is characterized by including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, where the processor, when executing the computer program, implements the method for protecting a dc transmission line according to any one of the above embodiments.
Compared with the prior art, the method, the device and the storage medium for protecting the direct-current transmission line disclosed by the embodiment of the invention have the advantages that the interval where the air humidity is located is determined by acquiring the air humidity, and when the current voltage of the direct-current transmission line is smaller than a preset voltage threshold value or the current voltage break variable is larger than a preset break variable threshold value under the condition that the air humidity is smaller than a first preset temperature, the line is judged to have a fault, and the protection action is carried out; and under the condition that the air humidity is higher than the second preset temperature, when the voltage of the direct current transmission line at each moment in a preset time period is smaller than a preset voltage threshold value, or all voltage break variables are larger than a preset break variable threshold value in the preset time period, judging that the line breaks down, and protecting the line. In the process of controlling whether the protection action is carried out or not, the influence of air humidity on the coupling action between the two leads is considered, when the air humidity is low, a strategy of immediate judgment is adopted, the workload is reduced, and when the air humidity is high, a strategy of continuous judgment is adopted, so that the protection misoperation of the lead on the non-fault side is avoided. In addition, a transitional humidity interval is set, when the humidity is in the interval, the original strategy is maintained, the situation that the system is repeatedly switched between the two strategies when the humidity fluctuates at the humidity limit is avoided, and the system is stable.
Drawings
Fig. 1 is a flowchart of a method for protecting a dc transmission line according to an embodiment of the present invention;
FIG. 2 is a diagram of a specific line voltage simulation waveform provided by an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a protection device for a direct current transmission line according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another dc transmission line protection device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments 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.
Referring to fig. 1, which is a flowchart of a method for protecting a dc transmission line according to embodiment 1 of the present invention, the method for protecting a dc transmission line includes:
s1, collecting the voltage of the direct current transmission line;
s2, acquiring air humidity;
s3, when the air humidity is smaller than a first preset humidity and the current voltage of the direct current transmission line is smaller than a preset voltage threshold, or when the air humidity is smaller than the first preset humidity and the current voltage break is larger than a preset break threshold, judging that the direct current transmission line breaks down, and performing protection action;
s4, when the air humidity is larger than a second preset humidity and the voltage of the direct current transmission line at each moment in a preset time period is smaller than a preset voltage threshold, or when the air humidity is larger than the second preset humidity and all the voltage break variables in the preset time period are larger than the preset break variable threshold, judging that the direct current transmission line breaks down, and performing protection action; wherein the first preset humidity is less than the second preset humidity.
Specifically, in step S1, the voltage of the dc transmission line is collected in real time; or, the voltage of the direct current transmission line is periodically collected.
Illustratively, the voltage of the direct current transmission line is periodically collected, the preset period is 1 millisecond, and the voltage collection is carried out every 1 millisecond.
It should be noted that the acquisition period is not limited to the specific time, and may be set according to actual conditions. In order to better protect the safety of the direct current transmission line, a real-time voltage acquisition mode can be adopted.
Specifically, in step S2, the air humidity is acquired in real time, or periodically.
Illustratively, the air humidity is acquired periodically, and the preset period is 5 minutes, and the humidity acquisition is performed every 5 minutes.
It is worth to be noted that, the humidity sensor may be used to detect the humidity of the environment where the dc transmission line is located, or the humidity of the environment where the dc transmission line is located may be obtained through networking; the acquisition period is not limited to the specific time described above, and may be set according to actual conditions. In order to better protect the safety of the direct current transmission line, a mode of acquiring air humidity in real time can be adopted; the humidity change rate rule of the environment where the direct current transmission line is located can be obtained through networking, and when the humidity change rate in the environment is not large, a mode of periodically obtaining humidity can be adopted.
Further, in step S3, when the air humidity is less than a first preset humidity and the current voltage of the dc transmission line is less than a preset voltage threshold, or when the air humidity is less than the first preset humidity and the current voltage break is greater than a preset break threshold, it is determined that the dc transmission line has a fault and a protection action is performed; and under the condition that the air humidity is smaller than a first preset humidity, when the current voltage of the direct current transmission line is not smaller than a preset voltage threshold and the current voltage mutation is not larger than a preset mutation threshold, the protection does not act.
Illustratively, the preset first preset humidity is 45%, the preset voltage threshold is 200 kv, and the preset abrupt change is 10 kv; under the condition that the current air humidity is 30%, when the current voltage of the direct current transmission line is 190 kilovolts, judging that the direct current transmission line has a fault, and performing protection action; under the condition that the current air humidity is 30%, when the current voltage break variable is 30 kilovolts, judging that the direct current transmission line has a fault, and performing protection action; and when the current voltage of the direct current transmission line is 220 kilovolts and the current voltage abrupt change is 2 kilovolts, the protection does not act. Under the condition of low air humidity, the coupling effect between two leads of the direct current transmission line is small, when one lead breaks down, the voltage influence on the non-fault lead is small, the false operation of the protection of the non-fault lead is not easy to cause, and therefore, the judgment is only carried out on the voltage or the voltage sudden change amount at the current moment.
It should be noted that the first preset temperature, the preset voltage threshold and the preset abrupt change are not limited to the above specific values, and may be set according to actual conditions. Generally, the first preset humidity can be preset according to the strength of the wire coupling effect under different humidities, and the preset voltage threshold and the preset sudden change quantity can be preset according to the specific voltage transmitted by the direct current transmission line.
Specifically, in steps S3 and S4, all the voltage break amounts in a preset time period are calculated according to the voltage of the dc transmission line at each time in the preset time period.
Exemplarily, in step S3, the preset time period is only one voltage acquisition cycle, that is, only the current time t and the previous time t-1 exist, and the absolute value is obtained by subtracting the voltage of the dc transmission line at the current time t from the voltage of the dc transmission line at the previous time t-1 to obtain the current voltage break variable; in step S4, a preset time period is set to include 5 voltage acquisition times, which are t, t-1, t-2, t-3, and t-4, respectively, and 4 voltage break amounts can be calculated.
It should be noted that the preset time period is not limited to the specific time period, and may be set according to actual situations.
Further, in step S4, when the air humidity is greater than a second preset humidity and the voltage of the dc transmission line at each time in a preset time period is less than a preset voltage threshold, or when the air humidity is greater than the second preset humidity and all the voltage variables in the preset time period are greater than the preset voltage threshold, it is determined that the dc transmission line has a fault and a protection action is performed; wherein the first preset humidity is less than the second preset humidity; and under the condition that the air humidity is greater than the second preset humidity, when the voltage of the direct current transmission line at each moment in a preset time period is not less than a preset voltage threshold value and all the voltage sudden change values in the preset time period are not greater than the preset sudden change threshold value, the protection does not act.
Illustratively, the second preset humidity is preset to be 55%, the preset voltage threshold is 200 kv, the preset abrupt change is 10 kv, and the preset time period is set to be 5 ms; under the condition that the current air humidity is 70%, when the voltage of the direct current transmission line at each moment within 5 milliseconds is less than 200 kilovolts or all the voltage break variables within 5 milliseconds are greater than 10 kilovolts, judging that the direct current transmission line has a fault and performing protection action; under the condition that the current air humidity is 70%, when the voltage of the direct current transmission line at each moment within 5 milliseconds is not less than 200 kilovolts and all the voltage break variables within 5 milliseconds are not more than 10 kilovolts, the protection does not act. Under the condition of high air humidity, the coupling effect between two leads of the direct current transmission line is high, when one lead breaks down, the voltage influence on the non-fault lead is high, and the false operation of the protection of the non-fault lead is easily caused.
It should be noted that the second preset temperature, the preset time period, the preset voltage threshold and the preset abrupt change are not limited to the above specific values, and may be set according to actual conditions. Generally, the second preset humidity and the preset time period can be preset according to the strength of the wire coupling effect under different humidities, and the preset voltage threshold and the preset abrupt change can be preset according to the specific voltage transmitted by the direct current transmission line.
Further, after the step S3, a step S31 is further included:
and step S31, when the air humidity rises to be not more than the second preset humidity and the current voltage of the direct current transmission line is less than the preset voltage threshold, or when the air humidity rises to be not more than the second preset humidity and the current voltage break is more than the preset break threshold, judging that the direct current transmission line has a fault and performing protection action.
For example, a first preset humidity is set to be 45% in advance, a second preset humidity is set to be 55%, a preset voltage threshold is 200 kv, a preset sudden change is-10 kv, and when the current voltage of the dc transmission line is less than 200 kv or the current voltage sudden change is greater than 10 kv under the condition that the air humidity is increased from 40% to 50%, it is determined that the dc transmission line has a fault, and a protection action is performed; otherwise, the protection does not act.
It should be noted that the first preset temperature, the second preset temperature, the preset voltage threshold and the preset abrupt change are not limited to the above specific values, and may be set according to actual conditions.
It is worth mentioning that when the direct current transmission line protection method is just started, and the acquired air humidity is not less than the first preset humidity and not more than the second preset humidity, optionally, one of the processing method that the air humidity is less than the first preset humidity and the processing method that the air humidity is greater than the second preset humidity is randomly selected, or, the air humidity prediction is acquired through networking, when the air humidity prediction is humidity rise, the processing method that the air humidity is greater than the second preset humidity is selected, otherwise, the processing method that the air humidity is less than the first preset humidity is selected.
Further, after the step S4, a step S41 is further included:
step S41, when the air humidity drops to be not less than the first preset humidity and the voltage of the dc transmission line at each time within a preset time period is less than the preset voltage threshold, or when the air humidity drops to be not less than the first preset humidity and all the voltage variables within the preset time period are greater than the preset variable threshold, determining that the dc transmission line has a fault and performing a protection action.
Illustratively, the preset first preset humidity is 45%, the preset second preset humidity is 55%, the preset voltage threshold is 200 kv, the preset abrupt change is 10 kv, and the preset time period is 5 ms; under the condition that the air humidity is reduced from 70% to 50%, when the voltage of the direct current transmission line at each moment within 5 milliseconds is less than 200 kilovolts, or the voltage break variable at each moment within 5 milliseconds is more than 10 kilovolts, judging that the direct current transmission line has a fault, and performing protection action; otherwise, the protection does not act.
It should be noted that the first preset temperature, the second preset temperature, the preset time period, the preset voltage threshold and the preset mutation amount are not limited to the above specific values, and may be set according to actual conditions.
To more intuitively understand the working effect of the protection method for the dc transmission line, refer to fig. 2, which is a specific line voltage simulation waveform diagram provided by the embodiment of the present invention, including the opposite-pole dc voltage, the local-pole dc voltage, the dc line current, the steepness of the two dc voltages, and the protection action signal. Wherein, the counter electrode is a positive electrode wire, the main electrode is a negative electrode wire, and in the voltage gradient part of fig. 2, the whole upper wavy line is the counter electrode voltage gradient, i.e. the voltage gradient 1, and the whole upper wavy line is the local voltage gradient, i.e. the voltage gradient 2. As can be seen from fig. 2, when the opposite pole wire fails, the gradient of the local voltage suddenly changes, but the local pole is not erroneously triggered by the protection action.
Referring to fig. 3, which is a schematic structural diagram of a dc transmission line protection device according to an embodiment of the present invention, the dc transmission line protection device 10 includes:
the voltage acquisition module 11 is used for acquiring the voltage of the direct current transmission line;
a humidity obtaining module 12, configured to obtain air humidity;
the first protection action module 13 is configured to determine that the dc power transmission line has a fault and perform a protection action when the air humidity is less than a first preset humidity and the current voltage of the dc power transmission line is less than a preset voltage threshold, or when the air humidity is less than the first preset humidity and the current voltage break is greater than a preset break threshold;
the second protection action module 14 is configured to determine that the dc transmission line has a fault and perform a protection action when the air humidity is greater than a second preset humidity and the voltage of the dc transmission line at each time in a preset time period is less than a preset voltage threshold, or when the air humidity is greater than the second preset humidity and all the voltage break variables in the preset time period are greater than the preset break variable threshold; wherein the first preset humidity is less than the second preset humidity.
Further, the apparatus further includes a break variable calculation module 15, configured to calculate all the voltage break variables in a preset time period according to the voltage of the dc transmission line at each time in the preset time period.
Further, the first protection action module 13 is configured to determine that the dc transmission line has a fault when the air humidity is less than a first preset humidity and the current voltage of the dc transmission line is less than a preset voltage threshold, or when the air humidity is less than the first preset humidity and the current voltage break is greater than a preset break threshold, and after the protection action, the first protection action module is further configured to:
and when the air humidity rises to be not more than the second preset humidity and the current voltage of the direct current transmission line is less than the preset voltage threshold, or when the air humidity rises to be not more than the second preset humidity and the current voltage break is more than the preset break threshold, judging that the direct current transmission line breaks down, and protecting the direct current transmission line.
Further, the second protection action module 14 is configured to determine that the dc transmission line has a fault when the air humidity is greater than a second preset humidity and the voltage of the dc transmission line at each time in a preset time period is less than a preset voltage threshold, or when the air humidity is greater than the second preset humidity and all the voltage variables in the preset time period are greater than the preset variable threshold, and after the protection action, the second protection action module is further configured to:
when the air humidity is not less than the first preset humidity and the voltage of the direct current transmission line at each moment in a preset time period is less than the preset voltage threshold, or when the air humidity is not less than the first preset humidity and all the voltage break variables in the preset time period are greater than the preset break variable threshold, it is determined that the direct current transmission line breaks down, and a protection action is performed.
It should be noted that, for a specific working process of the dc transmission line protection device 10, reference may be made to a working process of the dc transmission line protection method in the foregoing embodiment, and details are not described here again.
Compared with the prior art, the method, the device and the storage medium for protecting the direct-current transmission line disclosed by the embodiment of the invention have the advantages that the interval where the air humidity is located is determined by acquiring the air humidity, and when the current voltage of the direct-current transmission line is smaller than a preset voltage threshold value or the current voltage break variable is larger than a preset break variable threshold value under the condition that the air humidity is smaller than a first preset temperature, the line is judged to have a fault, and the protection action is carried out; and under the condition that the air humidity is higher than the second preset temperature, when the voltage of the direct current transmission line at each moment in a preset time period is smaller than a preset voltage threshold value, or all voltage break variables are larger than a preset break variable threshold value in the preset time period, judging that the line breaks down, and protecting the line. In the process of controlling whether the protection action is carried out or not, the influence of air humidity on the coupling action between the two leads is considered, when the air humidity is low, a strategy of immediate judgment is adopted, the workload is reduced, and when the air humidity is high, a strategy of continuous judgment is adopted, so that the protection misoperation of the lead on the non-fault side is avoided. In addition, a transitional humidity interval is set, when the humidity is in the interval, the original strategy is maintained, the situation that the system is repeatedly switched between the two strategies when the humidity fluctuates at the humidity limit is avoided, and the system is stable.
Referring to fig. 4, which is a schematic structural diagram of another dc power transmission line protection apparatus according to an embodiment of the present invention, a dc power transmission line protection apparatus 20 includes a processor 21, a memory 22, and a computer program stored in the memory 22 and configured to be executed by the processor 21, where when the processor 21 executes the computer program, the steps in the above dc power transmission line protection method embodiment, such as steps S1 to S4 shown in fig. 1, are implemented. Alternatively, the processor 21, when executing the computer program, implements the functions of the modules in the above-mentioned device embodiments, such as the voltage acquisition module 11.
Illustratively, the computer program may be divided into one or more modules, which are stored in the memory 22 and executed by the processor 21 to accomplish the present invention. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program in the dc transmission line protection device 20. For example, the computer program may be divided into a voltage acquisition module 11, a humidity acquisition module 12, a first protection action module 13 and a second protection action module 14, and the specific functions of each module are as follows:
the voltage acquisition module 11 is used for acquiring the voltage of the direct current transmission line;
a humidity obtaining module 12, configured to obtain air humidity;
the first protection action module 13 is configured to determine that the dc power transmission line has a fault and perform a protection action when the air humidity is less than a first preset humidity and the current voltage of the dc power transmission line is less than a preset voltage threshold, or when the air humidity is less than the first preset humidity and the current voltage break is greater than a preset break threshold;
the second protection action module 14 is configured to determine that the dc transmission line has a fault and perform a protection action when the air humidity is greater than a second preset humidity and the voltage of the dc transmission line at each time in a preset time period is less than a preset voltage threshold, or when the air humidity is greater than the second preset humidity and all the voltage break variables in the preset time period are greater than the preset break variable threshold; wherein the first preset humidity is less than the second preset humidity.
For the specific working process of each module, reference may be made to the working process of the dc transmission line protection device 10 described in the foregoing embodiment, which is not described herein again.
The dc transmission line protection device 20 may be a desktop computer, a notebook computer, a palm computer, a cloud server, or other computing devices. The dc transmission line protection device 20 may include, but is not limited to, a processor 21 and a memory 22. It will be appreciated by those skilled in the art that the schematic diagram is merely an example of an image enhancement device and does not constitute a limitation of the dc link protection device 20, and may include more or less components than those shown, or combine some components, or different components, for example, the dc link protection device 20 may further include an input-output device, a network access device, a bus, etc.
The Processor 21 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 device, discrete hardware component, etc. The general processor may be a microprocessor or the processor may be any conventional processor, and the processor 21 is a control center of the dc transmission line protection device 20, and various interfaces and lines are used to connect various parts of the whole dc transmission line protection device 20.
The memory 22 may be configured to store the computer program and/or the module, and the processor 21 implements various functions of the dc transmission line protection device 20 by running or executing the computer program and/or the module stored in the memory 22 and calling data stored in the memory 22. The memory 22 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory 22 may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
The integrated module of the dc transmission line protection device 20 may be stored in a computer readable storage medium if it is implemented in the form of a software functional unit and sold or used as an independent product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. A method for protecting a direct current transmission line is characterized by comprising the following steps:
collecting the voltage of a direct current transmission line;
acquiring air humidity;
when the air humidity is smaller than a first preset humidity and the current voltage of the direct current transmission line is smaller than a preset voltage threshold, or when the air humidity is smaller than the first preset humidity and the current voltage break is larger than a preset break threshold, judging that the direct current transmission line breaks down, and performing protection action;
when the air humidity is greater than a second preset humidity and the voltage of the direct current transmission line at each moment in a preset time period is smaller than a preset voltage threshold, or when the air humidity is greater than the second preset humidity and all the voltage break variables in the preset time period are greater than the preset break variable threshold, judging that the direct current transmission line has a fault and performing protection action; wherein the first preset humidity is less than the second preset humidity.
2. The method of protecting a direct current transmission line according to claim 1, further comprising:
and calculating all the voltage break variables in the preset time period according to the voltage of the direct current transmission line at each moment in the preset time period.
3. The method according to claim 1, wherein when the air humidity is less than a first preset humidity and the current voltage of the dc transmission line is less than a preset voltage threshold, or when the air humidity is less than the first preset humidity and the current voltage break is greater than a preset break threshold, it is determined that the dc transmission line has a fault, and after the protection action, the method further includes:
and when the air humidity rises to be not more than the second preset humidity and the current voltage of the direct current transmission line is less than the preset voltage threshold, or when the air humidity rises to be not more than the second preset humidity and the current voltage break is more than the preset break threshold, judging that the direct current transmission line breaks down, and protecting the direct current transmission line.
4. The method according to claim 1, wherein when the air humidity is greater than a second preset humidity and the voltage of the dc transmission line at each time within a preset time period is less than a preset voltage threshold, or when the air humidity is greater than the second preset humidity and all the voltage variables within the preset time period are greater than the preset variable threshold, it is determined that the dc transmission line has a fault, and after the protection action, the method further includes:
when the air humidity is not less than the first preset humidity and the voltage of the direct current transmission line at each moment in a preset time period is less than the preset voltage threshold, or when the air humidity is not less than the first preset humidity and all the voltage break variables in the preset time period are greater than the preset break variable threshold, it is determined that the direct current transmission line breaks down, and a protection action is performed.
5. A direct current transmission line protection device is characterized by comprising:
the voltage acquisition module is used for acquiring the voltage of the direct current transmission line;
the humidity acquisition module is used for acquiring air humidity;
the first protection action module is used for judging that the direct current transmission line has a fault and performing protection action when the air humidity is smaller than a first preset humidity and the current voltage of the direct current transmission line is smaller than a preset voltage threshold value or when the air humidity is smaller than the first preset humidity and the current voltage sudden change amount is larger than a preset sudden change amount threshold value;
the second protection action module is used for judging that the direct current transmission line has a fault and performing protection action when the air humidity is greater than a second preset humidity and the voltage of the direct current transmission line at each moment in a preset time period is less than a preset voltage threshold value, or when the air humidity is greater than the second preset humidity and all the voltage break variables in the preset time period are greater than the preset break variable threshold value; wherein the first preset humidity is less than the second preset humidity.
6. The apparatus according to claim 5, further comprising a break variable calculation module, configured to calculate all the voltage break variables in a preset time period according to the voltage of the dc transmission line at each time in the preset time period.
7. The device according to claim 5, wherein the first protection action module is configured to determine that the dc transmission line has a fault when the air humidity is less than a first preset humidity and the current voltage of the dc transmission line is less than a preset voltage threshold, or when the air humidity is less than the first preset humidity and the current voltage break amount is greater than a preset break amount threshold, and after the protection action, the first protection action module is further configured to:
and when the air humidity rises to be not more than the second preset humidity and the current voltage of the direct current transmission line is less than the preset voltage threshold, or when the air humidity rises to be not more than the second preset humidity and the current voltage break is more than the preset break threshold, judging that the direct current transmission line breaks down, and protecting the direct current transmission line.
8. The apparatus according to claim 5, wherein the second protection action module is configured to determine that the dc transmission line has a fault when the air humidity is greater than a second preset humidity and the voltage of the dc transmission line at each time in a preset time period is less than a preset voltage threshold, or when the air humidity is greater than the second preset humidity and all the voltage variables in the preset time period are greater than the preset variable threshold, and after the protection action, the second protection action module is further configured to:
when the air humidity is not less than the first preset humidity and the voltage of the direct current transmission line at each moment in a preset time period is less than the preset voltage threshold, or when the air humidity is not less than the first preset humidity and all the voltage break variables in the preset time period are greater than the preset break variable threshold, it is determined that the direct current transmission line breaks down, and a protection action is performed.
9. A storage medium comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the dc transmission line protection method according to any one of claims 1 to 4 when executing the computer program.
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| WO2021000738A1 (en) * | 2019-07-04 | 2021-01-07 | 中国电力科学研究院有限公司 | Direct-current transmission line protection method and system based on pure current characteristics |
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| US7499250B2 (en) * | 2006-04-19 | 2009-03-03 | Siemens Energy & Automation, Inc. | Systems, devices, and methods for temperature compensation in arc fault detection systems |
| CN204578064U (en) * | 2015-04-17 | 2015-08-19 | 浙江恒自电力自动化设备有限公司 | A kind of line protective devices with humidity alarm |
| US10120012B2 (en) * | 2015-05-05 | 2018-11-06 | Abb Schweiz Ag | Method and apparatus for detecting fault in a mixed configuration power transmission line |
| CN108548567A (en) * | 2018-07-13 | 2018-09-18 | 广东电网有限责任公司江门供电局 | A kind of transmission line online monitoring system with temperature monitoring |
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| CN109921391A (en) * | 2019-03-14 | 2019-06-21 | 中国电力科学研究院有限公司 | A kind of starting method and system of the protection of direct current supply line based on jump-value of current |
| WO2021000738A1 (en) * | 2019-07-04 | 2021-01-07 | 中国电力科学研究院有限公司 | Direct-current transmission line protection method and system based on pure current characteristics |
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