CN109888751B - Direct-current overvoltage protection method, device and equipment for extra-high voltage direct-current transmission - Google Patents
Direct-current overvoltage protection method, device and equipment for extra-high voltage direct-current transmission Download PDFInfo
- Publication number
- CN109888751B CN109888751B CN201910290011.0A CN201910290011A CN109888751B CN 109888751 B CN109888751 B CN 109888751B CN 201910290011 A CN201910290011 A CN 201910290011A CN 109888751 B CN109888751 B CN 109888751B
- Authority
- CN
- China
- Prior art keywords
- preset
- voltage
- diagnosed
- overvoltage protection
- valve group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The invention discloses an extra-high voltage direct currentAfter receiving collected circuit parameters, judging whether a valve group to be diagnosed receives trigger pulses, if so, executing a preset overvoltage protection rule corresponding to the valve group to be diagnosed according to the type and the circuit parameters of the valve group to be diagnosed; if not, the 400kV direct current bus voltage U in the circuit parameters is measured according to the type of the valve group to be diagnoseddMAnd after the preset value is set to the corresponding preset value, executing a preset overvoltage protection rule according to the reset circuit parameter. By generating a fluctuating 400kV DC bus voltage U when the valve block latches the trigger pulsedMThe sampling value is set as a corresponding preset value, and the voltage U of the 400kV direct current bus is eliminateddMThe influence of the fluctuation on the execution of the preset overvoltage protection rule is avoided, and the problem of misexport of the direct-current overvoltage protection is avoided to the greatest extent.
Description
Technical Field
The invention relates to the technical field of extra-high voltage direct current transmission, in particular to a direct current overvoltage protection method, a direct current overvoltage protection device, direct current overvoltage protection equipment and a computer readable storage medium for extra-high voltage direct current transmission.
Background
Ultra-high voltage direct current transmission (UHVDC) refers to direct current transmission with voltage class of +/-800 kV and above and related technologies. The direct current overvoltage protection is an important ring in the ultra-high voltage direct current transmission technology, a protection area is equipment bearing direct current voltage, a protection device mainly comprises a current converter and a direct current filter, the fault mainly executing protection is the condition that the direct current voltage is too high caused by open circuit of a direct current line or other positions, adjustment errors of a control system and the like, and the protection strategy is to detect the high voltage direct current overvoltage so as to protect the equipment on a high voltage line.
In extra-high voltage DC transmission lineIncluding a high side valve set and a low side valve set. The high-end valve bank is a twelve-pulse converter at a high-voltage side, and the low-end valve bank is a twelve-pulse converter at a low-voltage side. In the prior art, the collected voltage (including the high-voltage direct-current bus voltage U) is combineddH400kV DC bus voltage UdMAnd neutral dc bus voltage UdN) Current and time delay signals, and different protection outlet strategies are executed on the high-voltage valve group and the low-voltage valve group, for example, for the high-end valve group, when the high-voltage direct-current bus voltage is UdHAnd 400kV DC bus voltage UdMAnd when the difference value between the current transformer and the current transformer is larger than the preset value, the protection outlet action (immediate emergency shutdown ESOF, immediate trip/locking of the current transformer) is executed. One major problem of the above strategy is that when the valve group is locked to trigger pulse, the voltage U of the 400kV direct current bus isdMFluctuations can occur which can lead to false exits of the dc overvoltage protection.
How to avoid the loss caused by the direct current overvoltage protection misoutlet in the extra-high voltage direct current transmission line is a technical problem to be solved by technical personnel in the field.
Disclosure of Invention
The invention aims to provide a direct-current overvoltage protection method, a device, equipment and a computer readable storage medium for extra-high voltage direct-current transmission, which are used for avoiding loss caused by direct-current overvoltage protection misexit in an extra-high voltage direct-current transmission line.
In order to solve the technical problem, the invention provides a direct-current overvoltage protection method for extra-high voltage direct-current power transmission, which comprises the following steps:
receiving collected circuit parameters;
judging whether the valve group to be diagnosed receives a trigger pulse;
if so, executing a preset overvoltage protection rule corresponding to the valve group to be diagnosed according to the type of the valve group to be diagnosed and the circuit parameter;
if not, the 400kV direct current bus voltage U in the circuit parameters is measured according to the type of the valve group to be diagnoseddMAfter the preset value is set as the corresponding preset value, executing the preset overvoltage protection rule according to the reset circuit parameter;
the types of the valve banks to be diagnosed comprise a high-end valve bank and a low-end valve bank, the circuit parameters comprise a voltage parameter, a current parameter and a time delay parameter, and the voltage parameter comprises a high-voltage direct-current bus voltage UdH400kV DC bus voltage UdMAnd neutral dc bus voltage UdN。
Optionally, the preset value corresponding to the high-end valve bank is 400kV, and the preset value corresponding to the low-end valve bank is 0 kV.
Optionally, when the valve group to be diagnosed is the high-end valve group, the executing of the preset overvoltage protection rule corresponding to the valve group to be diagnosed according to the category of the valve group to be diagnosed and the circuit parameter specifically includes:
when the high voltage DC bus voltage UdHAnd the voltage U of the 400kV direct current busdMWhen the first difference value is more than or equal to the first threshold value and less than the second threshold value, the neutral bus current I in the current parameters is judgeddCNWhether a preset first direct current fixed value is met, if so, recording as a first event; judging that the duration time of the first event reaches a first preset time, and if so, executing an exit protection action;
when the first difference is greater than or equal to the second threshold and smaller than a third threshold, recording as a second event; judging whether the duration time of the second event reaches a second preset time or not, and if so, executing the protection outlet action;
when the first difference is larger than or equal to a third threshold value, recording as a third event; and judging whether the duration time of the third event reaches a third preset time, and if so, executing the protection outlet action.
Optionally, the method further includes:
and when the duration of the first event does not reach the first preset time or the duration of the second event does not reach the second preset time or the duration of the third event does not reach the third preset time, sending a high-end valve group protection outlet early warning signal to a designated address.
Optionally, when the valve group to be diagnosed is the low-end valve group, the executing of the preset overvoltage protection rule corresponding to the valve group to be diagnosed according to the category of the valve group to be diagnosed and the circuit parameter specifically includes:
when the voltage U of the 400kV direct current bus isdMAnd said neutral DC bus voltage UdNWhen the second difference value is more than or equal to a fourth threshold value and less than a fifth threshold value, the neutral bus current I in the current parameters is judgeddCNWhether a preset second direct current fixed value is met or not, and if the preset second direct current fixed value is met, recording as a fourth event; judging that the duration time of the fourth event reaches fourth preset time, and if so, executing protection outlet action;
when the second difference is greater than or equal to a fifth threshold and smaller than a sixth threshold, recording as a fifth event; judging whether the duration time of the fifth event reaches fifth preset time or not, and if so, executing the protection outlet action;
when the second difference is larger than or equal to the sixth threshold, recording as a sixth event; and judging whether the duration time of the sixth event reaches sixth preset time, and if so, executing protection exit action.
Optionally, the method further includes:
and when the duration of the fourth event does not reach the fourth preset time or the duration of the fifth event does not reach the fifth preset time or the duration of the sixth event does not reach the sixth preset time, sending a low-end valve group protection outlet early warning signal to a designated address.
Optionally, the protection outlet specifically includes:
and sending an emergency shutdown RSOF signal to the group control, and controlling the AC inlet wire switch to be tripped open or controlling the AC inlet wire switch to be locked.
In order to solve the above technical problem, the present invention further provides a dc overvoltage protection device for extra-high voltage dc power transmission, including:
the receiving unit is used for receiving the acquired circuit parameters;
the judging unit is used for judging whether the valve group to be diagnosed receives the trigger pulse; if yes, entering a first protection unit, and if not, entering a second protection unit;
the first protection unit is used for executing a preset overvoltage protection rule corresponding to the valve bank to be diagnosed according to the type of the valve bank to be diagnosed and the circuit parameter;
the second protection unit is used for converting the 400kV direct-current bus voltage U in the circuit parameters according to the type of the valve group to be diagnoseddMAfter the preset value is set as the corresponding preset value, executing the preset overvoltage protection rule according to the reset circuit parameter;
the types of the valve banks to be diagnosed comprise a high-end valve bank and a low-end valve bank, the circuit parameters comprise a voltage parameter, a current parameter and a time delay parameter, and the voltage parameter comprises a high-voltage direct-current bus voltage UdH400kV DC bus voltage UdMAnd neutral dc bus voltage UdN。
In order to solve the above technical problem, the present invention further provides a dc overvoltage protection device for extra-high voltage dc power transmission, including:
the memory is used for storing instructions, and the instructions comprise any one of the steps of the method for protecting the direct current overvoltage of the extra-high voltage direct current transmission;
a processor to execute the instructions.
In order to solve the above technical problem, the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the method for protecting a dc overvoltage of an extra-high voltage dc power transmission according to any one of the above.
The invention provides a direct current overvoltage protection method for extra-high voltage direct current transmission, which is characterized in that collected circuit parameters (including voltage parameters, current parameters and time delay parameters, wherein the voltage parameters include a high-voltage direct current bus voltage UdH400kV DC bus voltage UdMAnd neutral dc bus voltage UdN) Then, it is determined whether the valve set to be diagnosed (the category includes high-end valve set and low-end valve set) receives a trigger pulse, such asIf so, executing a preset overvoltage protection rule corresponding to the valve group to be diagnosed according to the type and the circuit parameters of the valve group to be diagnosed; if not, the 400kV direct current bus voltage U in the circuit parameters is measured according to the type of the valve group to be diagnoseddMAnd after the preset value is set to the corresponding preset value, executing a preset overvoltage protection rule according to the reset circuit parameter. By generating a fluctuating 400kV DC bus voltage U when the valve block latches the trigger pulsedMThe sampling value is set as a corresponding preset value, and the voltage U of the 400kV direct current bus is eliminateddMThe influence of the fluctuation on the execution of the preset overvoltage protection rule is avoided, and the problem of the misexport of the direct current overvoltage protection in the extra-high voltage direct current transmission line is avoided to the greatest extent. The invention also provides a direct current overvoltage protection device, equipment and a computer readable storage medium for extra-high voltage direct current transmission, which have the beneficial effects and are not described herein again.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a flowchart of a dc overvoltage protection method for extra-high voltage dc power transmission according to an embodiment of the present invention;
fig. 2 is a flowchart of a preset overvoltage protection rule corresponding to a high-voltage valve group according to an embodiment of the present invention;
fig. 3 is a flowchart of a preset overvoltage protection rule corresponding to a low-voltage valve set according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a dc overvoltage protection device for extra-high voltage dc power transmission according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a dc overvoltage protection device for extra-high voltage dc power transmission according to an embodiment of the present invention.
Detailed Description
The core of the invention is to provide a direct current overvoltage protection method, a device, equipment and a computer readable storage medium for extra-high voltage direct current transmission, which are used for avoiding the loss caused by the direct current overvoltage protection misexport in an extra-high voltage direct current transmission line.
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.
Fig. 1 is a flowchart of a dc overvoltage protection method for extra-high voltage dc power transmission according to an embodiment of the present invention. As shown in fig. 1, the method for protecting the dc overvoltage of the extra-high voltage dc power transmission includes:
s101: and receiving the collected circuit parameters.
The types of the valve group to be diagnosed comprise a high-end valve group and a low-end valve group, the circuit parameters comprise voltage parameters, current parameters and time delay parameters, and the voltage parameters comprise high-voltage direct-current bus voltage UdH400kV DC bus voltage UdMAnd neutral dc bus voltage UdN。
In specific implementation, circuit parameters acquired by an acquisition device (not limited to a voltage transformer, a current transformer and a timer) are received, wherein the circuit parameters comprise a voltage parameter, a current parameter and a time delay parameter, and the voltage parameter comprises a high-voltage direct-current bus voltage UdH400kV DC bus voltage UdMAnd neutral dc bus voltage UdNThe current parameter comprises neutral bus current IdCN、IdLNAnd the delay parameter is the duration time for starting recording when the acquisition value of a certain voltage parameter or a certain current parameter meets a preset condition.
S102: judging whether the valve group to be diagnosed receives a trigger pulse; if yes, go to step S103; if not, the process proceeds to step S104.
S103: and executing a preset overvoltage protection rule corresponding to the valve group to be diagnosed according to the type and the circuit parameters of the valve group to be diagnosed.
In specific implementation, before executing a preset overvoltage protection rule, it is required to determine whether a valve bank to be diagnosed is a high-end valve bank or a low-end valve bank, where the high-end valve bank and the low-end valve bank correspond to different preset overvoltage protection rules, and specifically, with reference to the prior art, such as voltage segment protection, current differential protection, and the like, a plurality of thresholds are set for voltage, current, and delay parameters, the voltage thresholds, the current thresholds, and the delay thresholds are combined, each gear corresponds to a protection action, and the protection action is executed when the voltage, current, and delay conditions of the gear are reached.
S104: according to the category of the valve group to be diagnosed, the voltage U of the 400kV direct current bus in the circuit parametersdMAnd after the preset value is set to the corresponding preset value, executing a preset overvoltage protection rule according to the reset circuit parameter.
Optionally, the preset value corresponding to the high-end valve bank may be 400kV, and the preset value corresponding to the low-end valve bank may be 0 kV. If the valve group to be diagnosed is a high-end valve group and the high-end valve group does not receive the trigger pulse (locking trigger pulse), firstly, the voltage U of the 400kV direct-current bus is applieddMThe collection value is 400kV, other voltage parameters are inconvenient, and a preset overvoltage protection rule corresponding to the high-end valve group is executed, such as when the voltage of a high-voltage direct-current bus is UdHAnd 400kV DC bus voltage UdMAnd executing protection exit action when the difference value between the exit points is larger than a certain threshold value, otherwise, not executing the protection exit action.
The protection outlet action is specifically to send an RSOF signal to the group control for emergency shutdown and control the AC inlet switch to be opened or control the AC inlet switch to be locked.
The embodiment of the invention provides a direct current overvoltage protection method for extra-high voltage direct current transmission, which is characterized in that collected circuit parameters (including voltage parameters, current parameters and time delay parameters, wherein the voltage parameters include high-voltage direct current bus voltage UdH400kV DC bus voltage UdMAnd neutral dc bus voltage UdN) Then, the valve group to be diagnosed (the category comprises a high-end valve group)And a low-end valve group) whether a trigger pulse is received, if so, executing a preset overvoltage protection rule corresponding to the valve group to be diagnosed according to the type and the circuit parameters of the valve group to be diagnosed; if not, the 400kV direct current bus voltage U in the circuit parameters is measured according to the type of the valve group to be diagnoseddMAnd after the preset value is set to the corresponding preset value, executing a preset overvoltage protection rule according to the reset circuit parameter. By generating a fluctuating 400kV DC bus voltage U when the valve block latches the trigger pulsedMThe sampling value is set as a corresponding preset value, and the voltage U of the 400kV direct current bus is eliminateddMThe influence of the fluctuation on the execution of the preset overvoltage protection rule is avoided, and the problem of the misexport of the direct current overvoltage protection in the extra-high voltage direct current transmission line is avoided to the greatest extent.
Fig. 2 is a flowchart of a preset overvoltage protection rule corresponding to a high-voltage valve bank according to an embodiment of the present invention. As shown in fig. 2, based on the above embodiment, in another embodiment, when the valve group to be diagnosed is a high-end valve group, the step S103 or the step S104 of executing the preset overvoltage protection rule corresponding to the valve group to be diagnosed according to the type and the circuit parameter of the valve group to be diagnosed specifically includes:
s201: when the high voltage DC bus voltage UdHAnd 400kV DC bus voltage UdMWhen the first difference value is more than or equal to the first threshold value and less than the second threshold value, the neutral bus current I in the current parameter is judgeddCNWhether a preset first direct current fixed value is met, if so, recording as a first event; and judging that the duration of the first event reaches a first preset time, and if so, executing protection exit action.
S202: when the first difference is greater than or equal to the second threshold and smaller than a third threshold, recording as a second event; and judging whether the duration time of the second event reaches a second preset time, and if so, executing protection exit action.
S203: when the first difference is larger than or equal to a third threshold value, recording as a third event; and judging whether the duration time of the third event reaches a third preset time, and if so, executing protection exit action.
In a specific implementation, an optional setting mode is that the first threshold U is setset1412kV, second threshold value Uset2416kV, a third threshold value Uset3The constant value of the first direct current is 0, the first preset time is 40ms, the second preset time is 1000ms, and the third preset time is 40ms at 620 kV.
When the valve group to be diagnosed is a high-end valve group, if a trigger pulse is received, the circuit parameters and the set values are applied to calculate the | U |dH-UdMValue of |, Ucal1Then the first event is 412kV ≦ Ucal1< 416kV and IdCN0, the second event is 416kV ≦ Ucal1< 620kV, the third event is Ucal1620kV, when the duration of the first event reaches 40ms, or the duration of the second event reaches 1000ms, or the duration of the third event reaches 40ms, executing the protection exit action, otherwise, not exiting the protection exit; if the trigger pulse is not received, firstly, the voltage U of the 400kV direct current bus in the circuit parameters is detecteddMSetting the voltage to 400kV, and then applying other circuit parameters and the set value to execute the preset overvoltage protection rule.
Further, the method for protecting the direct-current overvoltage of the extra-high voltage direct-current transmission further comprises the following steps:
and when the duration of the first event does not reach a first preset time or the duration of the second event does not reach a second preset time or the duration of the third event does not reach a third preset time, sending a high-end valve group protection outlet early warning signal to the designated address.
When a first event, a second event or a third event occurs, which indicates that the direct current circuit is in danger of overvoltage fault, a high-end valve group protection outlet early warning signal is sent to a designated address to prompt maintenance personnel.
Fig. 3 is a flowchart of a preset overvoltage protection rule corresponding to a low-voltage valve set according to an embodiment of the present invention. As shown in fig. 3, based on the above embodiment, in another embodiment, when the valve group to be diagnosed is a low-end valve group, the step S103 or step S104 of executing the preset overvoltage protection rule corresponding to the valve group to be diagnosed according to the type and the circuit parameter of the valve group to be diagnosed specifically includes:
s301: when the voltage of the 400kV direct current bus UdMAnd neutral dc bus voltage UdNWhen the second difference value is more than or equal to the fourth threshold value and less than the fifth threshold value, the neutral bus current I in the current parameter is judgeddCNWhether a preset second direct current fixed value is met or not, and if the preset second direct current fixed value is met, recording as a fourth event; and judging that the duration of the fourth event reaches a fourth preset time, and if so, executing a protection outlet action.
S302: when the second difference is greater than or equal to a fifth threshold and smaller than a sixth threshold, recording as a fifth event; and judging whether the duration time of the fifth event reaches a fifth preset time, and if so, executing protection exit action.
S303: when the second difference is larger than or equal to a sixth threshold, recording as a sixth event; and judging whether the duration time of the sixth event reaches sixth preset time, and if so, executing protection exit action.
In a specific implementation, an optional setting manner is that the fourth threshold U is setset4412kV, a fifth threshold value Uset5416kV, a sixth threshold Uset6The voltage is 620kV, the second direct current fixed value is 0, the first preset time is 40ms, the second preset time is 1000ms, and the third preset time is 40 ms.
When the valve bank to be diagnosed is a low-end valve bank, if a trigger pulse is received, the | U is calculated using the circuit parameters and the above setting valuesdM-UdNValue of |, Ucal2Then the fourth event is 412kV ≦ Ucal2< 416kV and IdCN0, the fifth event is 416kV ≦ Ucal2< 620kV, the sixth event is Ucal2620kV, when the duration of the fourth event reaches 40ms or the duration of the fifth event reaches 1000ms or the duration of the sixth event reaches 40ms, executing an exit protection action, otherwise, not exiting the protection; if the trigger pulse is not received, firstly, the voltage U of the 400kV direct current bus in the circuit parameters is detecteddMAnd setting the voltage to be 0kV, and then applying other circuit parameters and the set value to execute the preset overvoltage protection rule.
Further, the method for protecting the direct-current overvoltage of the extra-high voltage direct-current transmission further comprises the following steps:
and when the duration of the fourth event does not reach the fourth preset time or the duration of the fifth event does not reach the fifth preset time or the duration of the sixth event does not reach the sixth preset time, sending a high-end valve group protection outlet early warning signal to the designated address.
And when a fourth event, a fifth event or a sixth event occurs, which indicates that the direct current circuit is in danger of overvoltage fault, sending a high-end valve bank protection outlet early warning signal to a designated address to prompt maintenance personnel.
On the basis of the detailed description of the various embodiments corresponding to the method for protecting the direct-current overvoltage of the extra-high voltage direct-current transmission, the invention also discloses a device for protecting the direct-current overvoltage of the extra-high voltage direct-current transmission corresponding to the method.
Fig. 4 is a schematic structural diagram of a dc overvoltage protection device for extra-high voltage dc power transmission according to an embodiment of the present invention. As shown in fig. 4, the dc overvoltage protection device for extra-high voltage dc transmission includes:
a receiving unit 401, configured to receive the acquired circuit parameters;
a judging unit 402, configured to judge whether the valve group to be diagnosed receives a trigger pulse; if yes, go to the first protection unit 403, if no, go to the second protection unit 404;
a first protection unit 403, configured to execute a preset overvoltage protection rule corresponding to the valve group to be diagnosed according to the type and the circuit parameter of the valve group to be diagnosed;
a second protection unit 404, configured to apply a 400kV dc bus voltage U in the circuit parameters according to the category of the valve group to be diagnoseddMAfter the preset value is set to the corresponding preset value, executing a preset overvoltage protection rule according to the reset circuit parameter;
the types of the valve group to be diagnosed comprise a high-end valve group and a low-end valve group, the circuit parameters comprise voltage parameters, current parameters and time delay parameters, and the voltage parameters comprise high-voltage direct-current bus voltage UdH400kV DC bus voltage UdMAnd neutral dc bus voltage UdN。
Since the embodiments of the apparatus portion and the method portion correspond to each other, please refer to the description of the embodiments of the method portion for the embodiments of the apparatus portion, which is not repeated here.
Fig. 5 is a schematic structural diagram of a dc overvoltage protection device for extra-high voltage dc power transmission according to an embodiment of the present invention. As shown in fig. 5, the extra-high voltage dc power transmission dc overvoltage protection device may have a relatively large difference due to different configurations or performances, and may include one or more processors (CPUs) 510 (e.g., one or more processors) and a memory 520, one or more storage media 530 (e.g., one or more mass storage devices) storing applications 533 or data 532. Memory 520 and storage media 530 may be, among other things, transient or persistent storage. The program stored on the storage medium 530 may include one or more modules (not shown), each of which may include a series of instruction operations for the computing device. Further, the processor 510 may be configured to communicate with the storage medium 530, and execute a series of instruction operations in the storage medium 530 on the ultra-high voltage dc power transmission dc overvoltage protection device 500.
The extra-high voltage DC power transmission DC overvoltage protection device 500 may also include one or more power supplies 540, one or more wired or wireless network interfaces 550, one or more input-output interfaces 560, and/or one or more operating systems 531, such as Windows ServerTM，Mac OS XTM，UnixTM,LinuxTM，FreeBSDTMAnd so on.
The steps in the method for protecting the dc overvoltage of the extra-high voltage dc transmission described in fig. 1 to 3 are implemented by the dc overvoltage protection device of the extra-high voltage dc transmission based on the structure shown in fig. 5.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described dc overvoltage protection device for extra-high voltage dc power transmission and the computer-readable storage medium may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed method, apparatus, device and computer-readable storage medium may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of modules is merely a division of logical functions, and an actual implementation may have another division, for example, a plurality of modules or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form. Modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In addition, functional modules in the embodiments of the present application may be integrated into one processing module, or each of the modules may exist alone physically, or two or more modules are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.
The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a function calling device, or a network device) to execute all or part of the steps of the method of the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The method, the device, the equipment and the computer readable storage medium for the direct current overvoltage protection of the extra-high voltage direct current transmission are described in detail above. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (9)
1. A direct-current overvoltage protection method for extra-high voltage direct-current transmission is characterized by comprising the following steps:
receiving collected circuit parameters;
judging whether the valve group to be diagnosed receives a trigger pulse;
if so, executing a preset overvoltage protection rule corresponding to the valve group to be diagnosed according to the type of the valve group to be diagnosed and the circuit parameter;
if not, the 400kV direct current bus voltage U in the circuit parameters is measured according to the type of the valve group to be diagnoseddMAfter the preset value is set as the corresponding preset value, executing the preset overvoltage protection rule according to the reset circuit parameter;
the types of the valve banks to be diagnosed comprise a high-end valve bank and a low-end valve bank, the circuit parameters comprise a voltage parameter, a current parameter and a time delay parameter, and the voltage parameter comprises a high-voltage direct-current bus voltage UdH400kV DC bus voltage UdMAnd neutral dc bus voltage UdN(ii) a The preset value corresponding to the high-end valve bank is 400kV, and the preset value corresponding to the low-end valve bank is 0 kV.
2. The dc overvoltage protection method according to claim 1, wherein when the valve group to be diagnosed is the high-end valve group, the executing of the preset overvoltage protection rule corresponding to the valve group to be diagnosed according to the class of the valve group to be diagnosed and the circuit parameter specifically comprises:
when the high voltage DC bus voltage UdHAnd the voltage U of the 400kV direct current busdMWhen the first difference value is more than or equal to the first threshold value and less than the second threshold value, the neutral bus current I in the current parameters is judgeddCNWhether a preset first direct current fixed value is met, if so, recording as a first event; judging that the duration time of the first event reaches a first preset time, and if so, executing an exit protection action;
when the first difference is greater than or equal to the second threshold and smaller than a third threshold, recording as a second event; judging whether the duration time of the second event reaches a second preset time or not, and if so, executing the protection outlet action;
when the first difference is larger than or equal to a third threshold value, recording as a third event; and judging whether the duration time of the third event reaches a third preset time, and if so, executing the protection outlet action.
3. The dc overvoltage protection method of claim 2, further comprising:
and when the duration of the first event does not reach the first preset time or the duration of the second event does not reach the second preset time or the duration of the third event does not reach the third preset time, sending a high-end valve group protection outlet early warning signal to a designated address.
4. The dc overvoltage protection method according to claim 1, wherein when the valve group to be diagnosed is the low-end valve group, the executing of the preset overvoltage protection rule corresponding to the valve group to be diagnosed according to the class of the valve group to be diagnosed and the circuit parameter specifically comprises:
when the voltage U of the 400kV direct current bus isdMAnd said neutral DC bus voltage UdNWhen the second difference value is more than or equal to a fourth threshold value and less than a fifth threshold value, the neutral bus current I in the current parameters is judgeddCNWhether a preset second direct current fixed value is met or not, and if the preset second direct current fixed value is met, recording as a fourth event; judging that the duration time of the fourth event reaches fourth preset time, and if so, executing protection outlet action;
when the second difference is greater than or equal to a fifth threshold and smaller than a sixth threshold, recording as a fifth event; judging whether the duration time of the fifth event reaches fifth preset time or not, and if so, executing the protection outlet action;
when the second difference is larger than or equal to the sixth threshold, recording as a sixth event; and judging whether the duration time of the sixth event reaches sixth preset time, and if so, executing protection exit action.
5. The dc overvoltage protection method of claim 4, further comprising:
and when the duration of the fourth event does not reach the fourth preset time or the duration of the fifth event does not reach the fifth preset time or the duration of the sixth event does not reach the sixth preset time, sending a low-end valve group protection outlet early warning signal to a designated address.
6. The dc overvoltage protection method according to any one of claims 2 to 5, wherein the protection outlet action is specifically:
and sending an emergency shutdown RSOF signal to the group control, and controlling the AC inlet wire switch to be tripped open or controlling the AC inlet wire switch to be locked.
7. A direct current overvoltage protection device for extra-high voltage direct current transmission is characterized by comprising:
the receiving unit is used for receiving the acquired circuit parameters;
the judging unit is used for judging whether the valve group to be diagnosed receives the trigger pulse; if yes, entering a first protection unit, and if not, entering a second protection unit;
the first protection unit is used for executing a preset overvoltage protection rule corresponding to the valve bank to be diagnosed according to the type of the valve bank to be diagnosed and the circuit parameter;
the second protection unit is used for converting the 400kV direct-current bus voltage U in the circuit parameters according to the type of the valve group to be diagnoseddMAfter the preset value is set as the corresponding preset value, executing the preset overvoltage protection rule according to the reset circuit parameter;
the types of the valve banks to be diagnosed comprise a high-end valve bank and a low-end valve bank, the circuit parameters comprise a voltage parameter, a current parameter and a time delay parameter, and the voltage parameter comprises a high-voltage direct-current bus voltage UdH400kV DC bus voltage UdMAnd neutral dc bus voltage UdN(ii) a The preset value corresponding to the high-end valve bank is 400kV, and the preset value corresponding to the low-end valve bank is 0 kV.
8. A direct current overvoltage protection device for extra-high voltage direct current transmission is characterized by comprising:
a memory for storing instructions, the instructions comprising the steps of the method for dc overvoltage protection for extra-high voltage dc transmission according to any one of claims 1 to 6;
a processor to execute the instructions.
9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method for dc overvoltage protection for extra-high voltage dc transmission according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910290011.0A CN109888751B (en) | 2019-04-11 | 2019-04-11 | Direct-current overvoltage protection method, device and equipment for extra-high voltage direct-current transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910290011.0A CN109888751B (en) | 2019-04-11 | 2019-04-11 | Direct-current overvoltage protection method, device and equipment for extra-high voltage direct-current transmission |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109888751A CN109888751A (en) | 2019-06-14 |
| CN109888751B true CN109888751B (en) | 2021-02-12 |
Family
ID=66937070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910290011.0A Active CN109888751B (en) | 2019-04-11 | 2019-04-11 | Direct-current overvoltage protection method, device and equipment for extra-high voltage direct-current transmission |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109888751B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110456131B (en) * | 2019-07-25 | 2021-06-22 | 南方电网科学研究院有限责任公司 | Method, device and equipment for positioning direct-current voltage measurement abnormity |
| CN110794197B (en) * | 2019-09-19 | 2021-08-03 | 中国南方电网有限责任公司超高压输电公司广州局 | Method for rapidly diagnosing converter station direct-current voltage measurement abnormity |
| CN112086935B (en) * | 2020-08-20 | 2022-09-20 | 许继电气股份有限公司 | Converter transformer differential protection control method and device capable of achieving adaptive voltage reduction operation |
| CN114204683B (en) * | 2021-12-13 | 2023-11-28 | 南方电网科学研究院有限责任公司 | Extra-high voltage flexible direct current transmission system direct current voltage measurement abnormality detection method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106911142A (en) * | 2017-04-01 | 2017-06-30 | 国家电网公司 | Extra-high voltage direct-current transmission control method and control device based on voltage calculated value |
| CN109193577A (en) * | 2018-08-01 | 2019-01-11 | 长沙理工大学 | A kind of improved HVDC transmission line traveling-wave protection method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103730880B (en) * | 2013-12-05 | 2016-04-20 | 国家电网公司 | One is applicable to MMC flexible direct current sub-module overvoltage Control protection method |
| CN104953568B (en) * | 2015-07-17 | 2017-11-07 | 江苏雪梅制冷设备有限公司 | A kind of fault protecting method of flexible direct current power transmission system |
| CN105449650B (en) * | 2016-01-25 | 2018-09-11 | 云南电网有限责任公司电力科学研究院 | A kind of protection system and method for flexible direct current intelligence transmission and distribution network |
| CN106849033B (en) * | 2017-04-14 | 2019-03-12 | 云南电网有限责任公司电力科学研究院 | A kind of optimization method of inverter zero sequence overvoltage protection logic |
| CN107276055B (en) * | 2017-07-31 | 2019-03-08 | 南方电网科学研究院有限责任公司 | The DC low-voltage of DC rectifier station pole control system monitors guard method |
-
2019
- 2019-04-11 CN CN201910290011.0A patent/CN109888751B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106911142A (en) * | 2017-04-01 | 2017-06-30 | 国家电网公司 | Extra-high voltage direct-current transmission control method and control device based on voltage calculated value |
| CN109193577A (en) * | 2018-08-01 | 2019-01-11 | 长沙理工大学 | A kind of improved HVDC transmission line traveling-wave protection method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109888751A (en) | 2019-06-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109888751B (en) | Direct-current overvoltage protection method, device and equipment for extra-high voltage direct-current transmission | |
| US10355523B2 (en) | Power distribution terminal capable of determining fault type and determination method thereof | |
| DE112012001189T5 (en) | Methods, systems and devices for detecting parallel electric arc faults | |
| US11062078B1 (en) | Insulation coordination method and system for a series compensation apparatus, storage medium and electronic device | |
| CN110620495B (en) | Method and device for restraining VSC short-circuit current | |
| CN110994553B (en) | Transformer differential protection constant value adjusting method based on waveform decay characteristic | |
| CN109412109B (en) | Method and device for identifying abnormal large numbers and relay protection equipment | |
| CN111239646B (en) | On-load tap-changer interstage short circuit fault early warning method and device and storage medium | |
| CN112540337A (en) | Transformer substation outgoing line capacitive voltage transformer monitoring method, device and equipment | |
| CN108808635A (en) | A kind of HVDC transmission line monopole failure separation method | |
| CN117310408A (en) | Method and device for determining fault arc, photovoltaic system and medium | |
| RU160043U1 (en) | MICROPROCESSOR DEVICE FOR DIFFERENTIAL PROTECTION | |
| CN109814039B (en) | Storage battery pack open circuit detection method and device and computer readable storage medium | |
| CN115207888B (en) | Rapid export method and device of relay protection device, terminal and storage medium | |
| US20230184849A1 (en) | Methods for detecting an electrical fault, associated electrical protection systems | |
| JP2002345172A (en) | Harmonic-monitoring system in power system | |
| CN115693649A (en) | Distribution network loop closing power supply switching calculation method and device | |
| CN112865073B (en) | Safety and stability control system switching method, device and equipment for power quick-drop fault | |
| CN110350481B (en) | Differential protection method, system, equipment and storage medium of transformer | |
| CN109390923B (en) | Power distribution control method and device for low-voltage direct-current power distribution equipment | |
| CN110994570A (en) | Power distribution network protection method and system, protection equipment and storage medium | |
| RU108232U1 (en) | DEVICE FOR INCREASING AN ACTIVE SINGLE-PHASE CIRCUIT TO EARTH IN COMPENSATED ELECTRIC NETWORKS WITH NEUTRAL EARTHED THROUGH AN ARC EXTING REACTOR | |
| CN113224734A (en) | Method and terminal for realizing line auxiliary protection | |
| CN112394298A (en) | Method for detecting turn-to-turn short circuit of reactor | |
| RU2400764C1 (en) | Method of controlling three-phase feeder isolation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |