CN111510000A - Operation control method, device and equipment for prolonging service life of defective tap changer - Google Patents
Operation control method, device and equipment for prolonging service life of defective tap changer Download PDFInfo
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- CN111510000A CN111510000A CN202010175525.4A CN202010175525A CN111510000A CN 111510000 A CN111510000 A CN 111510000A CN 202010175525 A CN202010175525 A CN 202010175525A CN 111510000 A CN111510000 A CN 111510000A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/043—Conversion of ac power input into dc power output without possibility of reversal by static converters using transformers or inductors only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
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Abstract
The invention discloses an operation control method for prolonging the service life of a defective tap changer, wherein when the defective tap changer exists in a direct current system, the control modes of all tap changers are switched from an angle control mode to a voltage control mode; wherein the all tap changers include the defective tap changer and a non-defective tap changer, the defective tap changer representing a tap changer that is defective but still functional. And the running mode and the restarting mode of the direct current system are adjusted correspondingly. The invention also discloses a corresponding operation control device and equipment, and by implementing the embodiment of the invention, the action times of the tap changer can be effectively reduced under the condition that the defective tap changer still can be operated under the condition that the defective tap changer cannot be replaced in time, so that the service life of the tap changer is prolonged, and the safe and stable operation of a system is ensured.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to an operation control method, device and equipment for prolonging the service life of a defective tap switch.
Background
The direct current converter transformer is an important component in direct current engineering and has the function of transforming alternating current voltage into voltage class suitable for a direct current converter. The tap switch of the converter transformer adjusts the primary/secondary side turn ratio of the converter transformer by adjusting the position of the secondary side tap of the converter transformer so as to adjust the secondary side voltage, so that the trigger angle of the direct current system is in a certain safe operation range.
In actual operation of a dc system, a tap changer may be defective, such as cracked, in which case the defective tap changer can still operate, but in an unsafe condition. If the system still operates according to the original operation state at this moment, the cracks of the defect tap changer are further increased, and finally the defect tap changer is unusable, so that the safe and stable operation of the direct current system is seriously influenced. At present, when a condition of a defect of the tap changer is met, the tap changer is usually directly replaced to ensure the normal operation of a direct current system.
However, in the process of implementing the invention, the inventor finds that the prior art has at least the following problems: the direct replacement of the defective tap changer is high in cost and not beneficial to resource utilization. And when the conditions that equipment is purchased and the production period is long, a manufacturer cannot respond to replacement quickly, or a plurality of devices have defects simultaneously, and all the defective tap changers cannot be replaced in time are met, the defective tap changers are operated according to the original mode, and the stable operation of the direct current system is influenced.
Disclosure of Invention
The invention aims to provide an operation control method, an operation control device and operation control equipment for prolonging the service life of a defective tap changer, which can effectively reduce the action times of the tap changer under the condition that the defective tap changer still can be operated even though the defective tap changer cannot be replaced in time, so that the service life of the tap changer is prolonged, and the safe and stable operation of a system is ensured.
In order to achieve the above object, an embodiment of the present invention provides an operation control method for prolonging a service life of a defective tap changer, including:
when the direct current system has a defective tap switch, switching the control modes of all tap switches from an angle control mode to a voltage control mode; wherein the all tap changers comprise the defective tap changer and a non-defective tap changer; the defective tap changer represents a tap changer that is defective but still functional.
As an improvement of the above solution, after the control mode of all the tap changers is switched from the angle control mode to the voltage control mode, the method further includes:
sending a first scheduling control instruction to adjust the operation mode of the direct current system; the first scheduling control instruction is used for controlling the direct-current system not to be in a 70% voltage reduction operation mode.
As an improvement of the above solution, after the control mode of all the tap changers is switched from the angle control mode to the voltage control mode, the method further includes:
sending a second scheduling control instruction to adjust the fault restarting mode of the direct current system; and the second scheduling control instruction is used for controlling the direct-current system not to be put into a 70% voltage reduction restarting mode when a fault occurs.
As an improvement of the above scheme, after the control mode of all the tap changers is switched from the angle control mode to the voltage control mode, the method further comprises the following steps:
and when the direct current system does not have the defective tap switch, switching the control modes of all tap switches into an angle control mode.
As an improvement of the above, the operation control method for prolonging the service life of the defective tap changer further comprises:
when the trigger angle of the inversion side of the direct current system is ensured to meet the preset safe operation condition, the action interval time of the defect tap switch is increased; the preset safe operation condition is that the trigger angle is not less than 120 degrees, or the trigger angle cannot be continuously less than 120 degrees within a preset time length;
and after the action interval time of the defective tap changer is increased, sending a tap changer action command to control the defective tap changer to act according to the increased action interval time.
As an improvement of the above, after increasing the time interval between actions of the defective tap changer, the method further includes:
increasing an action monitoring time of a tap of the defective tap changer such that the action monitoring time of the tap is greater than an action interval time of the defective tap changer.
As an improvement of the above, after increasing the time interval between actions of the defective tap changer, the method further includes:
calculating the time required by the direct current system to switch from the locking state to the standby state after the action interval time of the defective tap switch is increased and the time required by the standby switch to be switched into the locking state;
increasing the monitoring time of the locking standby of the direct current system so that the monitoring time of the locking standby is larger than the time required by the locking standby;
and increasing the monitoring time of a standby transfer lock of the direct current system so that the monitoring time of the standby transfer lock is larger than the time required by the standby transfer lock.
The embodiment of the invention also provides an operation control device for prolonging the service life of the defective tap changer, which comprises a control mode switching module; wherein the content of the first and second substances,
the control mode switching module is used for switching the control modes of all tap switches from an angle control mode to a voltage control mode when the direct-current system has defective tap switches; wherein the all tap changers comprise the defective tap changer and a non-defective tap changer; the defective tap changer represents a tap changer that is defective but still functional.
As an improvement of the above scheme, the operation control device further comprises an action interval time adjusting module and an action instruction sending module, wherein,
the action interval time adjusting module is used for increasing the action interval time of the defect tap switch when the trigger angle of the inversion side of the direct current system is ensured to meet the preset safe operation condition; the preset safe operation condition is that the trigger angle is not less than 120 degrees, or the trigger angle cannot be continuously less than 120 degrees within a preset time length;
and the action instruction sending module is used for sending a tap changer action instruction after the action interval time of the defect tap changer is increased so as to control the defect tap changer to act according to the increased action interval time.
An embodiment of the present invention further provides an operation control device for prolonging a lifetime of a defective tap changer, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor, when executing the computer program, implements the operation control method for prolonging the lifetime of a defective tap changer according to any one of the above.
Compared with the prior art, the operation control method, the device and the equipment for prolonging the service life of the defective tap changer disclosed by the invention have the advantages that when the tap changer of a direct current system has defects and can still operate, the control modes of all the tap changers are switched from the angle control mode to the voltage control mode, and the operation mode and the restarting mode of the direct current system are adjusted, so that the action times of the defective tap changer are obviously reduced, and the service life of the defective tap changer is prolonged. In addition, after the control mode of the tap switch is switched to the voltage control mode, when the trigger angle of the inverter side of the direct current system is ensured to meet the preset safe operation condition, the action interval time of the defect tap switch is increased, and the defect tap switch is controlled to act according to the increased action interval time, so that the action times of the defect tap switch are reduced; and after the action interval time of the defective tap changer is increased, the monitoring time of the tap and the monitoring time of the locking standby are correspondingly increased so as to ensure the normal operation of the system. Under the condition that the defective tap changer can not be replaced in time but the tap changer can still operate, the embodiment of the invention can effectively reduce the action times of the tap changer so as to prolong the service life of the tap changer and ensure the safe and stable operation of the system. Meanwhile, the utilization rate of the tapping switch is improved, and the cost is saved.
Drawings
Fig. 1 is a schematic flow chart illustrating steps of an operation control method for prolonging the service life of a defective tap changer according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating steps of a preferred operation control method for prolonging the service life of a defective tap changer according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of an operation control device for prolonging the service life of a defective tap changer according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of an operation control device for prolonging the service life of a defective tap changer according to a fourth 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.
Example one
Fig. 1 is a schematic flow chart illustrating steps of an operation control method for prolonging the service life of a defective tap changer according to an embodiment of the present invention. The operation control method for prolonging the service life of the defective tap changer provided by the first embodiment of the invention is implemented through steps S11 to S14:
s11, when the direct current system has a defective tap changer, switching the control modes of all tap changers from an angle control mode to a voltage control mode (Udi0 control mode); wherein the all tap changers comprise the defective tap changer and a non-defective tap changer; the defective tap changer represents a tap changer that is defective but still functional.
In a direct current system, a tap switch of a converter transformer adjusts the primary/secondary side turn ratio of the converter transformer by adjusting the position of a secondary side tap of the converter transformer, and finally, the secondary side voltage can be adjusted, so that the trigger angle of the inversion side of the direct current system transforms alternating current voltage into voltage grade suitable for a direct current converter within a certain safe operation range. The relationship among the direct current voltage, the alternating current voltage and the trigger angle is shown as the following formula:
Udi0＝1.35*E*cos(α)
wherein, Udi0D is DC voltage, E is AC voltage, the value can be adjusted by adjusting the tap changer, α is trigger angle, the safe operation condition of the trigger angle is that the trigger angle is not less than 120 degree, or the trigger angle can not be less than 120 degree continuously in the preset time length
In the embodiment of the invention, when the tap changer of the converter transformer is checked to have defects such as cracks and the like, and can still continuously operate, in order to prolong the service life of the continuous use of the defective tap changer, the control mode of the tap changer is switched from the angle control mode to the Udi0 control mode, so that the cracks of the defective tap changer are prevented from being increased.
Specifically, the service condition of each tap switch in the direct current system is detected by checking the tap switch of the converter transformer of the direct current system periodically or checking the tap switch according to an emergency situation. Whether the direct current system has the defect tap changer can be judged by obtaining a service condition report file of the tap changer, and when the defect tap changer is judged to exist, the control mode of the tap changer is switched from the angle control mode to the Udi0 control mode; the use condition of the tap changer after the inspection can be directly input by a user, for example, when the direct current system has a defective tap changer, the control mode of the tap changer is switched from the angle control mode to the Udi0 control mode according to the control instruction input by the user, which does not affect the beneficial effects obtained by the invention.
Under the condition that the alternating voltage is relatively stable, when the power is adjusted greatly, for example, the power is adjusted from 0.1p.u. to rated power, the action times of the tap switch of the converter substation can be obviously reduced, the increase of cracks of the defective tap switch is avoided, and therefore the service life of the defective tap switch is prolonged.
It should be noted that in the embodiment of the present invention, besides the defective tap changer, other non-defective tap changers are also required to operate in Udi0 control mode. If the tap switches of each valve bank are in different operation modes, the bisdodecagonal pulsation valve bank can operate asymmetrically, so that the problem of 24-time resonance of 400kV is caused, and the normal operation of a direct current system is influenced.
Further, after the control modes of all tap changers are switched from the angle control mode to the Udi0 control mode, the Udi0 control mode causes the action range of the flip angle on the inverter side to be enlarged, so that the operation of the dc system needs to be adjusted accordingly in order to ensure the safe operation condition of the flip angle.
S12, sending a first scheduling control instruction to adjust the running mode of the direct current system; the first scheduling control instruction is used for controlling the direct-current system not to be in a 70% voltage reduction operation mode.
Preferably, the first scheduling control instruction is further used for controlling the direct current system to be in a full-voltage operation mode or an 80% voltage reduction operation mode.
In the Udi0 control mode, the maximum operating angle of the bipolar in the 70% step-down mode of operation is large, resulting in increased converter valve stress. Therefore, it is desirable to avoid putting the dc system into a 70% step-down mode of operation, while controlling the dc voltage of the dc system to operate in either a full-voltage mode of operation or an 80% step-down mode of operation.
S13, sending a second scheduling control instruction to adjust the fault restarting mode of the direct current system; and the second scheduling control instruction is used for controlling the direct-current system not to be put into a 70% voltage reduction restarting mode when a fault occurs.
Preferably, the second scheduling control instruction is further used for controlling the direct current system to be put into a full-voltage restart mode or an 80% voltage reduction restart mode when the direct current system fails.
Under the control mode of Udi0, in the 70% step-down restart process of rated power, because the gear adjusting time is longer, before not shifting gears yet, the high-low valve bank inversion side trigger angle is less than 120 degrees and continuously exceeds 18s, so that the large-angle monitoring protection action of the low valve bank is caused, and the low valve bank is locked. Therefore, it is necessary to avoid the dc system from being put into the 70% step-down restart mode, and control the full-voltage restart or the 80% step-down restart of the dc system.
It should be noted that, in the first embodiment of the present invention, the execution sequence of steps S12 and S13 may be replaced with each other, without affecting the beneficial effect of the present invention.
And S14, after the control modes of all the tap changers are switched from the angle control mode to the voltage control mode, when the direct current system has no defective tap changer, the control modes of all the tap changers are switched to the angle control mode.
The normal operation mode of the tap switch is an angle control mode, and after the defective tap switch is replaced or the original defect is solved, namely when the direct current system has no defective tap switch, the control modes of all the tap switches are switched back to the angle control mode, so that the safe and stable operation of the direct current system is ensured.
When the tap changer of the direct current system has defects but can still operate, the control modes of all the tap changers are switched from the angle control mode to the voltage control mode, and the operation mode and the restarting mode of the direct current system are correspondingly adjusted, so that the action times of the defective tap changer are obviously reduced, and the service life of the defective tap changer is prolonged. Under the condition that the tap changer which has defects but can still run cannot be replaced in time, the action times of the tap changer are effectively reduced, so that the service life of the tap changer is prolonged, and the safe and stable running of a system is ensured. Meanwhile, the utilization rate of the tapping switch is improved, and the cost is saved.
Example two
Referring to fig. 2, a schematic flowchart of steps of a preferred operation control method for prolonging the lifetime of a defective tap changer according to a second embodiment of the present invention is shown. The second embodiment of the present invention is implemented on the basis of the operation control method for prolonging the service life of the defective tap changer described in the first embodiment, and specifically executed through steps S21 to S27:
s21, when the direct current system has a defective tap switch, switching the control mode of all tap switches from an angle control mode to a voltage control mode; wherein the all tap changers comprise the defective tap changer and a non-defective tap changer; the defective tap changer represents a tap changer that is defective but still functional.
S22, sending a first scheduling control instruction to adjust the running mode of the direct current system; the first scheduling control instruction is used for controlling the direct-current system not to be in a 70% voltage reduction operation mode.
S23, sending a second scheduling control instruction to adjust the fault restarting mode of the direct current system; and the second scheduling control instruction is used for controlling the direct-current system not to be put into a 70% voltage reduction restarting mode when a fault occurs.
In this embodiment, the steps S21 to S23 are similar to the processes performed in the steps S11 to S13 in the first embodiment, and have the same beneficial effects, which are not repeated herein.
S24, increasing the action interval time of the defect tap switch when the trigger angle of the inversion side of the direct current system is ensured to meet the preset safe operation condition; the preset safe operation condition is that the trigger angle is not less than 120 degrees, or the trigger angle cannot be continuously less than 120 degrees within a preset time length; and after the action interval time of the defective tap changer is increased, sending a tap changer action command to control the defective tap changer to act according to the increased action interval time.
In the embodiment of the invention, when the direct current system has a defective tap switch, the control mode of all tap switches is switched from the angle control mode to the voltage control mode. And by increasing the time T between the actions of the defective tap changer after switching to the voltage control modetransFurther reduce defect rateThe number of gear shifting actions of the switch in unit time is connected. Time interval T between actions of defective tap changertransThe actual operation condition of the system is considered in the step length increase, and the requirement that the trigger angle of the inverter side can still operate within a certain safe operation range is met, so that the normal operation of a direct current system is ensured. The preset safe operation condition is that the trigger angle is not less than 120 degrees, or the trigger angle can not be continuously less than 120 degrees within a preset time length. The preset time period may be set according to an actual condition of the operation of the dc system, for example, the preset time period is 18 s.
In the process of increasing the action interval time of the defective tap changer, in order to enable the trigger angle on the inversion side to meet the safe operation condition, the direct current power regulation process, such as power limitation, frequency limitation, restarting and the like, needs to be considered, so that the trigger angle on the inversion side meets the safe operation condition. By way of example, the increased inter-active time of the defective tap changer does not affect the normal power regulation and fast settling time of the system. The tap changer is continuously adjusted for an interval of 3 to 3.5 minutes (corresponding to a single pole of 300MW to 350MW) calculated for a normal power adjustment of 100 MW/min. And if the lifting speed under the normal condition is less than 100MW/min, the action interval time of the tap changer for continuous adjustment is more than 3.5 minutes. The time between the continuous adjustment of the tap changer was set to 20s, calculated as the limit power adjustment of the system at 999 MW/min. It should be noted that the specific value of the increased action interval time is determined according to the operation condition and the operation requirement of the actual project, and is not specifically limited herein.
When the action interval time T of the defective tap changer is increasedtransAnd then, sending a tapping switch action command to the defect tapping switch so as to control the defect tapping switch to perform tap shifting action according to the increased action interval time as a time interval.
In the embodiment of the invention, the action interval time T of the defective tap changer is increasedtransThe number of actions per unit time is reduced, and the service life of the defective tap changer can be prolonged. While making possible the presence of insulating oil in the tap changerThe conductive foreign matter has more sufficient dispersion time, thereby reducing the possibility of oil gap breakdown in operation.
As a preferred embodiment, referring to fig. 2, after step S24, the method further includes step S25:
and S25, increasing the action monitoring time of the tap of the defect tap changer so that the action monitoring time of the tap is larger than the action interval time of the defect tap changer.
When the action interval time T of the defective tap changer is increasedtransThen, the operation monitoring time T of the tap is also requiredmoni1Synchronous modification is performed to meet the time coordination inside the system control logic. In the control logic of the tap, after the control protection program monitors and issues the tap switch action command, whether the tap switch acts within a specified time is monitored, and if the tap switch does not act, the operation fault exists. Increases the action time interval T of the tap changertransThen, if the monitoring time T of the tap is not modified correspondinglymoni1The control protection program will be frequently reported in error.
Thus, the time interval T between the actions of the defective tap changer is increasedtransThen, the operation monitoring time T of the tap is increasedmoni1So that it satisfies Tmoni1>TtransThereby further ensuring the normal operation of the direct current system.
As a preferred embodiment, after step S24, step S26 is further included;
s26, calculating the time required by the direct current system to switch from the locking state to the standby state and the time required by the standby switching state after the action interval time of the defective tap switch is increased; increasing the monitoring time of the locking standby of the direct current system so that the monitoring time of the locking standby is larger than the time required by the locking standby; and increasing the monitoring time of a standby transfer lock of the direct current system so that the monitoring time of the standby transfer lock is larger than the time required by the standby transfer lock.
When the action interval time T of the defective tap changer is increasedtransThen, also for DC systemsMonitoring time T for switching from locking to standbymoni2And monitoring time T of standby transfer lockmoni3Synchronous modification is performed to meet the time coordination inside the system control logic.
In the process of locking to standby, the tap switch is actuated for a plurality of times, because of the time interval T of each actuationtransAnd therefore, if the monitoring time of the lock transfer to standby is not modified, the time required for the lock transfer to standby exceeds the monitoring time in the program, and the command fails. Therefore, the time T between actions of the dc system in increasing the defective tap changer needs to be calculatedtransTime T required for subsequent lock transferblk2stbAnd increasing the monitoring time T of the latch switch back-upmoni2So that it satisfies Tmoni2>Tblk2stbThereby further ensuring the normal operation of the direct current system. Similarly, the time required by the standby transfer lock is calculated, and the monitoring time T of the standby transfer lock is increasedmoni3So that it is greater than the time required for the standby twist lock.
It should be noted that, in the second embodiment of the present invention, the execution sequence of steps S25 and S26 may be replaced with each other, or may be performed simultaneously, without affecting the beneficial effect of the present invention.
The second embodiment of the invention provides an operation control method for prolonging the service life of a defective tap changer, when the tap changer of a direct current system has defects but can still operate, the control modes of all the tap changers are switched from an angle control mode to a voltage control mode, and the operation mode and the restarting mode of the direct current system are adjusted, so that the action times of the defective tap changer are obviously reduced, and the service life of the defective tap changer is prolonged. In addition, after the control mode of the tap switch is switched to the voltage control mode, when the trigger angle of the inverter side of the direct current system is ensured to meet the preset safe operation condition, the action interval time of the defect tap switch is increased, and the defect tap switch is controlled to act according to the increased action interval time, so that the action times of the defect tap switch are further reduced; and after the action interval time of the defective tap changer is increased, the monitoring time of the tap and the monitoring time of the locking standby are correspondingly increased so as to ensure the normal operation of the system. Under the condition that the defective tap changer can not be replaced in time but the tap changer can still operate, the embodiment of the invention can effectively reduce the action times of the tap changer so as to prolong the service life of the tap changer and ensure the safe and stable operation of the system. Meanwhile, the utilization rate of the tapping switch is improved, and the cost is saved.
EXAMPLE III
Fig. 3 is a schematic structural diagram of an operation control device for prolonging the service life of a defective tap changer according to a third embodiment of the present invention. The operation control device 30 for prolonging the service life of the defective tap changer provided by the third embodiment of the invention comprises a control mode switching module 31; wherein the content of the first and second substances,
the control mode switching module 31 is configured to switch the control modes of all tap switches from the angle control mode to the voltage control mode when the dc system has a defective tap switch; wherein the all tap changers comprise the defective tap changer and a non-defective tap changer; the defective tap changer represents a tap changer that is defective but still functional.
In a preferred embodiment, the operation control device 30 further includes an action interval time adjusting module 32 and an action command sending module 33, wherein,
the action interval time adjusting module 32 is configured to increase the action interval time of the defective tap changer when the inverter-side trigger angle of the dc system is ensured to meet a preset safe operation condition; the preset safe operation condition is that the trigger angle is not less than 120 degrees, or the trigger angle cannot be continuously less than 120 degrees within a preset time length;
the action instruction sending module 33 is configured to send a tap changer action instruction after increasing the action interval time of the defective tap changer, so as to control the defective tap changer to act according to the increased action interval time.
It should be noted that the operation control device for prolonging the service life of the defective tap changer according to the embodiment of the present invention is used to execute all the process steps of the operation control method for prolonging the service life of the defective tap changer according to the first or second embodiment, and the working principles and beneficial effects of the two are in one-to-one correspondence, so that details are not repeated.
According to the operation control device for prolonging the service life of the defective tap changer, when the tap changer of the direct current system has defects but can still operate, the control modes of all the tap changers are switched from the angle control mode to the voltage control mode, and the operation mode and the restarting mode of the direct current system are adjusted, so that the action times of the defective tap changer are obviously reduced, and the service life of the defective tap changer is prolonged. In addition, after the control mode of the tap switch is switched to the voltage control mode, when the trigger angle of the inverter side of the direct current system is ensured to meet the preset safe operation condition, the action interval time of the defect tap switch is increased, and the defect tap switch is controlled to act according to the increased action interval time, so that the action times of the defect tap switch are further reduced; and after the action interval time of the defective tap changer is increased, the monitoring time of the tap and the monitoring time of the locking standby are correspondingly increased so as to ensure the normal operation of the system. Under the condition that the defective tap changer can not be replaced in time but the tap changer can still operate, the embodiment of the invention can effectively reduce the action times of the tap changer so as to prolong the service life of the tap changer and ensure the safe and stable operation of the system. Meanwhile, the utilization rate of the tapping switch is improved, and the cost is saved.
Example four
Fig. 4 is a schematic structural diagram of an operation control device for prolonging the service life of a defective tap changer according to a fourth embodiment of the present invention. An operation control device 40 for prolonging the service life of a defective tap changer according to a fourth embodiment of the present invention includes a processor 41, a memory 42, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the operation control device realizes the operation control method for prolonging the service life of a defective tap changer according to the first embodiment or the second embodiment.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-only memory (ROM), a Random Access Memory (RAM), or 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 (10)
1. An operation control method for prolonging the service life of a defective tap changer, comprising:
when the direct current system has a defective tap switch, switching the control modes of all tap switches from an angle control mode to a voltage control mode; wherein the all tap changers comprise the defective tap changer and a non-defective tap changer; the defective tap changer represents a tap changer that is defective but still functional.
2. The method of operational control for extending the life of a defective tap changer of claim 1 wherein said switching the control mode of all tap changers from the angle control mode to the voltage control mode further comprises:
sending a first scheduling control instruction to adjust the operation mode of the direct current system; the first scheduling control instruction is used for controlling the direct-current system not to be in a 70% voltage reduction operation mode.
3. The method of operational control for extending the life of a defective tap changer of claim 1 wherein said switching the control mode of all tap changers from the angle control mode to the voltage control mode further comprises:
sending a second scheduling control instruction to adjust the fault restarting mode of the direct current system; and the second scheduling control instruction is used for controlling the direct-current system not to be put into a 70% voltage reduction restarting mode when a fault occurs.
4. The method of operational control for prolonging the life of a defective tap changer of any of claims 1-3 wherein, after switching the control mode of all tap changers from the angle control mode to the voltage control mode, further comprising:
and when the direct current system does not have the defective tap switch, switching the control modes of all tap switches into an angle control mode.
5. The method of operational control for prolonging life of a defective tap changer of any of claims 1-3 further comprising:
when the trigger angle of the inversion side of the direct current system is ensured to meet the preset safe operation condition, the action interval time of the defect tap switch is increased; the preset safe operation condition is that the trigger angle is not less than 120 degrees, or the trigger angle cannot be continuously less than 120 degrees within a preset time length;
and after the action interval time of the defective tap changer is increased, sending a tap changer action command to control the defective tap changer to act according to the increased action interval time.
6. The method of operational control for extending the life of a defective tap changer of claim 5 wherein said increasing the time between actuations of said defective tap changer further comprises:
increasing an action monitoring time of a tap of the defective tap changer such that the action monitoring time of the tap is greater than an action interval time of the defective tap changer.
7. The method of operational control for extending the life of a defective tap changer of claim 5 wherein said increasing the time between actuations of said defective tap changer further comprises:
calculating the time required by the direct current system to switch from the locking state to the standby state after the action interval time of the defective tap switch is increased and the time required by the standby switch to be switched into the locking state;
increasing the monitoring time of the locking standby of the direct current system so that the monitoring time of the locking standby is larger than the time required by the locking standby;
and increasing the monitoring time of a standby transfer lock of the direct current system so that the monitoring time of the standby transfer lock is larger than the time required by the standby transfer lock.
8. An operation control device for prolonging the service life of a defective tap changer is characterized by comprising a control mode switching module; wherein the content of the first and second substances,
the control mode switching module is used for switching the control modes of all tap switches from an angle control mode to a voltage control mode when the direct-current system has defective tap switches; wherein the all tap changers comprise the defective tap changer and a non-defective tap changer; the defective tap changer represents a tap changer that is defective but still functional.
9. The operational control apparatus for extending the life of a defective tap changer of claim 8 further comprising an inter-action time adjustment module, an action command transmission module, wherein,
the action interval time adjusting module is used for increasing the action interval time of the defect tap switch when the trigger angle of the inversion side of the direct current system is ensured to meet the preset safe operation condition; the preset safe operation condition is that the trigger angle is not less than 120 degrees, or the trigger angle cannot be continuously less than 120 degrees within a preset time length;
and the action instruction sending module is used for sending a tap changer action instruction after the action interval time of the defect tap changer is increased so as to control the defect tap changer to act according to the increased action interval time.
10. An operation control device for prolonging the service life of a defective tap changer, 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 operation control method for prolonging the service life of a defective tap changer according to any one of claims 1 to 7 when executing the computer program.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010175525.4A CN111510000A (en) | 2020-03-13 | 2020-03-13 | Operation control method, device and equipment for prolonging service life of defective tap changer |
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| CN202010175525.4A CN111510000A (en) | 2020-03-13 | 2020-03-13 | Operation control method, device and equipment for prolonging service life of defective tap changer |
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