CN113125946A - Gear adjusting method, medium and system for tap switch of converter transformer valve bank - Google Patents
Gear adjusting method, medium and system for tap switch of converter transformer valve bank Download PDFInfo
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- CN113125946A CN113125946A CN202110240105.4A CN202110240105A CN113125946A CN 113125946 A CN113125946 A CN 113125946A CN 202110240105 A CN202110240105 A CN 202110240105A CN 113125946 A CN113125946 A CN 113125946A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000004364 calculation method Methods 0.000 claims abstract description 6
- 238000010079 rubber tapping Methods 0.000 claims abstract description 3
- 238000004590 computer program Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 101100152598 Arabidopsis thaliana CYP73A5 gene Proteins 0.000 description 2
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- 101000937756 Homo sapiens Box C/D snoRNA protein 1 Proteins 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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Abstract
The invention discloses a gear adjusting method, medium and system for a tap changer of a converter transformer valve bank. The method comprises the following steps: calculating the valve side voltage of the converter transformer valve bank; if the voltage on the valve side is greater than the first preset voltage, a command of forbidding gear-up is sent to a tap switch of a converter transformer of the converter transformer valve bank; wherein, the converter transformer valve group comprises six converter transformers, each converter transformer is provided with a tapping switch, and the calculation formula of the valve side voltage is
Udi0 denotes the valve side voltage, Uac denotes the network side access voltage of the converter transformer valve pack, TCPmax denotes the highest gear of the tap changer, TCPNOR denotes the nominal gear of the tap changer, n denotes the regulating step of the tap changer. The invention ensures that the voltage stress protection can effectively cover all equipment, avoids protection refusal and perfects the voltage stress protection logic of the converter transformer.
Description
Technical Field
The invention relates to the technical field of voltage stress protection of converter transformer valve banks, in particular to a gear adjusting method, medium and system of a tap switch of a converter transformer valve bank.
Background
For a direct current converter station, a tap switch of a converter transformer plays a vital role, and when direct current power rises or system voltage is disturbed, the transformation ratio of a network side and a valve side of the converter transformer is changed by adjusting the tap switch, and the voltage Udi0 of the valve side of the converter transformer is changed, so that the aims of adjusting the direct current voltage and enabling a trigger angle to operate within a reasonable range are further fulfilled, and the stable operation of a direct current transmission system is ensured.
In order to prevent the equipment from being damaged by overhigh voltage on the valve side of the converter transformer, the direct current control protection system is provided with voltage stress protection of the converter transformer, the voltage Udi0 on the valve side of the converter transformer is used as a reference, and when Udi0 is overhigh, the voltage on the valve side is reduced by limiting the gear-up of a tap switch and controlling the gear-down of the tap switch or tripping off an incoming line breaker of the converter transformer, so that all converter equipment threatened by alternating current voltage is protected from bearing extreme insulation stress, and the valve arrester is prevented from bearing the overstress and the overexcitation of the converter transformer.
The voltage stress protection of the conventional direct current and extra-high voltage direct current converter stations is different in the logic of selecting the converter transformer valve side voltage Udi0, and the synchronous functions of 6 converter transformer tap switches of the same valve group are not uniform, so that the technical defect exists. The maximum overvoltage condition of the valve side equipment cannot be reflected no matter the gear information of the Y/Y-A, Y/Y-B phase is adopted or the Udi0 is calculated by adopting the gear information of 6 converter-level averaging gears; when the 6 tap switches are inconsistent, a downshift instruction is still issued, the gear difference of the 6 tap switches is further increased, and a protection action may be caused; in addition, no monitoring function is provided for the tap changer gear information of the converter transformer, and effective inhibition measures cannot be taken when gear jump occurs. Therefore, in the prior art, the voltage stress protection cannot completely reflect the real fault state of the equipment, and the purpose of effectively protecting the equipment cannot be achieved.
Disclosure of Invention
The embodiment of the invention provides a gear adjusting method, medium and system for a tap changer of a converter transformer valve group, and aims to solve the problems that the real fault state of equipment cannot be completely reflected and the equipment cannot be effectively protected in the prior art.
In a first aspect, a method for adjusting a tap changer of a converter transformer valve bank comprises the following steps: calculating the valve side voltage of the converter transformer valve bank; if the valve side voltage is larger than a first preset voltage, a command of forbidding gear-up is sent to a tap switch of a converter transformer of the converter transformer valve group; the converter transformer valve group comprises a plurality of converter transformers, each converter transformer is provided with a tapping switch, and the calculation formula of the valve side voltage is
Udi0 denotes the valve side voltage, Uac denotes the network side access voltage of the converter transformer valve pack, TCPmax denotes the highest gear of the tap changer, TCPNOR denotes the rated gear of the tap changer, and n denotes the adjustment step size of the tap changer.
In a second aspect, there is provided a computer readable storage medium having computer program instructions stored thereon; the computer program instructions, when executed by a processor, implement the method for tap changer step adjustment of a converter transformer valve pack according to the embodiment of the first aspect.
In a third aspect, a gear adjustment system for a tap changer of a converter transformer valve block is provided, comprising: a computer readable storage medium as in the second aspect.
Therefore, the embodiment of the invention can be applied to the voltage stress protection function of the converter transformer of all conventional direct current and extra-high voltage direct current converter stations, and the highest gear is adopted to participate in the voltage stress protection, so that the actual overvoltage condition of the equipment at the valve side of the converter transformer is fully reflected, the voltage stress protection can effectively cover all the equipment, the protection rejection is avoided, and the voltage stress protection logic of the converter transformer is perfected; the judgment of the consistency of gears and whether the tap switch is in an automatic control mode is added in the tap switch gear shifting logic, and the current state is kept when the gears are not consistent, so that the problems of protection misoperation and direct current locking caused by the fact that gears of a single converter transformer are jammed, other converter transformers continuously shift gears and the gear level difference of the tap switch of the converter transformer is increased can be solved; meanwhile, a tap changer gear jump monitoring function in normal operation is added, and further processing measures are taken when the gear abnormally jumps, so that the operation reliability of the direct current system is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced 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 inventive labor.
Fig. 1 is a flow chart of a method for adjusting the tap changer gear of a converter transformer valve pack according to a preferred embodiment of the invention;
fig. 2 is a flow chart of a method for adjusting the tap changer step of a converter transformer valve pack according to another preferred embodiment of the present invention;
fig. 3 is a flow chart of a method for gear adjustment of a tap changer of a converter transformer valve pack according to yet another preferred embodiment of the present invention;
fig. 4 is a logic diagram for the step adjustment of the tap changer of a converter transformer valve pack according to an embodiment of the invention;
fig. 5 is a logic diagram of tap changers of a converter transformer valve pack of an embodiment of the invention all located at the same gear;
fig. 6 is a schematic diagram of the calculation of the tap changer positions of a converter transformer valve pack according to an embodiment of the invention;
fig. 7 is a logic diagram for determining gear step change of a tap changer of a converter transformer valve pack according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a gear adjusting method for a tap changer of a converter transformer valve bank. The converter transformer valve group comprises six converter transformers. Each converter transformer has a tap switch. As shown in fig. 1, a gear adjusting method according to a preferred embodiment of the present invention includes the steps of:
step S101: and calculating the valve side voltage of the converter transformer valve bank.
Specifically, the valve-side voltage is calculated as follows:
wherein Udi0 represents a valve side voltage, Uac represents a network side access voltage of the converter transformer valve group, TCPmax represents the highest gear of the tap changer (the highest gear is the highest gear that can be adjusted, for example, in a specific embodiment, the highest gear is 29 if the gear that can be adjusted is 1-29), TCPNOR represents the rated gear of the tap changer, and n represents the adjustment step size of the tap changer.
The highest gear and the rated gear are different according to different direct current engineering designs and can be determined according to actual conditions. The adjustment step size is generally set when the device leaves the factory. It should be understood that the highest gear, the rated gear and the adjustment step size of the tap changer of the same converter transformer valve pack are generally the same.
Specifically, in the logic diagram shown in fig. 4, the positions of the six tap changers are represented by TCPyya, TCPyyb, TCPyyc, TCPyda, TCPydb, and TCPydc, respectively, wherein the highest position of the six tap changers is calculated to be Udi 0.
Step S102: and if the voltage on the valve side is greater than the first preset voltage, a command of forbidding gear-up is sent to a tap switch of a converter transformer of the converter transformer valve bank.
The converter transformer valve block is provided with voltage stress protection, through which the command may be issued, it being understood that the command is for the tap changers of all converter transformers of the converter transformer valve block. The first preset voltage is an empirical value. As shown in fig. 4, REF1 represents a first preset voltage, in comparison, Udi0 is represented by a, and REF1 is represented by b, and when a is greater than b, an upshift inhibit command is issued, represented by INH _ INC _ TC.
Through the steps, the highest gear of the tap switch of the converter transformer is adopted to calculate the voltage of the valve side, and overvoltage at the valve side of any converter transformer is prevented.
As shown in fig. 2, a gear adjustment method according to another preferred embodiment of the present invention includes the steps of:
step S201: and calculating the valve side voltage of the converter transformer valve bank.
This step is the same as the step S101, and is not described herein again.
Step S202: and if the valve side voltage is greater than the second preset voltage, the tap switches of the converter transformers of the converter transformer valve bank are all located at the same gear, and the control modes of the tap switches of the converter transformers of the converter transformer valve bank are all automatic, and a gear descending instruction is sent to the tap switches of the converter transformers of the converter transformer valve bank.
The converter transformer valve block is provided with voltage stress protection, through which the command may be issued, it being understood that the command is for the tap changers of all converter transformers of the converter transformer valve block. The second predetermined voltage is an empirical value. As shown in fig. 5, when the tap switches TCPyya, TCPyyb, TCPyyc, TCPyda, TCPydb, and TCPydc of all the converter transformers in the converter transformer valve group are located at the same gear, the signal TCP _ EQUAL (value 1) is output. As shown in fig. 4, REF2 represents a second preset voltage, in comparison, Udi0 is represented by a, REF2 is represented by c, and when a is larger than c and simultaneously satisfies the condition that a signal TCP _ EQUAL outputting that all the tap changers of the converter transformer valve group are located at the same gear and the control mode of all the tap changers of the converter transformer valve group is an automatic signal AUTO, a gear step down command is issued, and is represented by DEC _ TC.
Through the steps, when any one of the conditions is not met, the tap switch keeps the current state, gear synchronization and judgment on whether the tap switch is in the automatic control mode are added, and the problem of direct current locking caused by continuous gear shifting of other converter transformers due to gear jamming of the tap switch of a single converter transformer is avoided.
As shown in fig. 3, a gear adjustment method according to still another preferred embodiment of the present invention includes the steps of:
step S301: and calculating the valve side voltage of the converter transformer valve bank.
This step is the same as the step S101, and is not described herein again.
Step S302: and if the valve side voltage is greater than the third preset voltage and the gears of the tap switches of the converter transformers of the converter transformer valve bank are not jumped, sending a tripping instruction to the tap switches of the converter transformers of the converter transformer valve bank.
The converter transformer valve block is provided with voltage stress protection, through which the command may be issued, it being understood that the command is for the tap changers of all converter transformers of the converter transformer valve block.
In a specific embodiment of the present invention, the tap changer gear is calculated using a 6-digit BCD (Binary-Coded differential) code. As shown in FIG. 6, the bit weights of the 6-bit BCD 1-6 codes are 1, 2, 4, 8, 10 and 20 respectively. For example, when the tap changer is in the 14 th gear, if the signals of BCD3 and BCD5 are 1, 10+4 is 14, and the 14 th gear is realized. When the gear is in the 23 th gear, if the signals of the BCD1, the BCD2 and the BCD6 are 1, 1+2+20 is 23, and the gear of the 23 th gear is realized. In the embodiment, the gears of 1-29 gears can be realized.
Because the signals of the BCD code are all cable signal inputs, the hidden danger that the signals cannot normally open due to loose wiring exists, so that gear calculation errors are caused, Udi0 calculation errors in voltage stress protection are further caused, protection misoperation is caused, therefore, the condition of gear jumping needs to be eliminated, all the tap switches of the converter transformer valve bank need not to jump, and each tap switch is in a normal working state.
The definition for hopping is as follows: and if the absolute value of the difference value of the two adjacent gears of the tap changer exceeds a preset threshold value, determining the gear jump of the tap changer of the converter transformer. In normal operation, the tap changer is step-adjusted in gear, and each adjustment can only be performed by 1 gear, so that the preset threshold value is generally 1. And if the difference value of two adjacent gears exceeds 1 (namely is more than or equal to 2), the gear jump is considered to occur. As shown in fig. 7, a current gear is represented by TCP, a previous gear is represented by q-1, an absolute value of a difference between the current gear and the previous gear is represented by | a-b |, and f is a preset threshold, and then after | a-b | > f, a gear JUMP signal TCP _ JUMP may be sent out with a delay of 1s for insurance. In a particular circuit design, this logic may be implemented with RS flip-flops.
The third predetermined voltage is an empirical value. As shown in fig. 4, REF3 represents a third predetermined voltage, in comparison, Udi0 is represented by a, REF3 is represented by d, and when a is greater than d and no tap change is satisfied, a TRIP command is issued, represented by TRIP. Specifically, when a circuit is actually designed, an inverting logic device may be arranged to invert TCP _ JUMP, that is, when any tap switch of the converter transformer valve group JUMPs, the inverted logic device outputs TCP _ JUMP as 0, and after the result phase that the valve side voltage is greater than the third preset voltage is anded, a trip instruction is not sent; when all the tap switches of the converter transformer valve bank are not jumped, a tripping instruction is sent out after the result phase of the TCP _ JUMP which is output to the inverse logic device and the valve side voltage which is greater than the third preset voltage is AND-ed with the result phase.
Through the steps, the tap changer gear jump monitoring function in normal operation is added, and further processing measures are taken when the gear abnormally jumps, so that the operation reliability of the direct current system is improved.
The embodiment of the invention also discloses a computer readable storage medium. The computer readable storage medium having stored thereon computer program instructions; the computer program instructions, when executed by a processor, implement a method for tap changer step adjustment of a converter transformer valve pack according to any of the embodiments described above.
The embodiment of the invention also discloses a gear adjusting system of the tap changer of the converter transformer valve group, which comprises the following components: a computer readable storage medium as in the above embodiments.
To sum up, the embodiment of the invention can be applied to the voltage stress protection function of the converter transformer of all conventional direct current and extra-high voltage direct current converter stations, and the highest gear is adopted to participate in the voltage stress protection, so that the actual overvoltage condition of the equipment at the valve side of the converter transformer is fully reflected, the voltage stress protection can effectively cover all the equipment, the protection refusal is avoided, and the voltage stress protection logic of the converter transformer is perfected; the judgment of the consistency of gears and whether the tap switch is in an automatic control mode is added in the tap switch gear shifting logic, and the current state is kept when the gears are not consistent, so that the problems of protection misoperation and direct current locking caused by the fact that gears of a single converter transformer are jammed, other converter transformers continuously shift gears and the gear level difference of the tap switch of the converter transformer is increased can be solved; meanwhile, a tap changer gear jump monitoring function in normal operation is added, and further processing measures are taken when the gear abnormally jumps, so that the operation reliability of the direct current system is improved.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A gear adjusting method for a tap changer of a converter transformer valve bank is characterized by comprising the following steps:
calculating the valve side voltage of the converter transformer valve bank;
if the valve side voltage is larger than a first preset voltage, a command of forbidding gear-up is sent to a tap switch of a converter transformer of the converter transformer valve group;
the converter transformer valve group comprises six converter transformers, each converter transformer is provided with a tapping switch, and the calculation formula of the valve side voltage is
Udi0 denotes the valve side voltage, Uac denotes the network side access voltage of the converter transformer valve pack, TCPmax denotes the highest gear of the tap changer, TCPNOR denotes the rated gear of the tap changer, and n denotes the adjustment step size of the tap changer.
2. The method for tap changer gear adjustment of a converter transformer valve pack according to claim 1, characterized in that after said step of calculating the valve side voltage of a converter transformer valve pack, said method for gear adjustment further comprises:
and if the valve side voltage is greater than a second preset voltage, the tap switches of the converter transformers of the converter transformer valve bank are all located at the same gear, and the control modes of the tap switches of the converter transformers of the converter transformer valve bank are all automatic, a gear descending instruction is sent to the tap switches of the converter transformers of the converter transformer valve bank.
3. The method for tap changer gear adjustment of a converter transformer valve pack according to claim 1, characterized in that after said step of calculating the valve side voltage of a converter transformer valve pack, said method for gear adjustment further comprises:
and if the valve side voltage is greater than a third preset voltage and no gear of a tap switch of a converter transformer of the converter transformer valve group jumps, sending a tripping instruction to the tap switch of the converter transformer valve group.
4. A method for adjusting the tap changer of a converter transformer valve pack according to claim 3, characterized in that: and if the absolute value of the difference value of the two adjacent gears of the tap changer exceeds a preset threshold value, determining the gear jump of the tap changer of the converter transformer.
5. A computer-readable storage medium characterized by: the computer readable storage medium having stored thereon computer program instructions; the computer program instructions, when executed by a processor, implement a method for tap changer gear adjustment of a converter transformer valve pack according to any of claims 1-4.
6. A gear adjusting system of a tap changer of a converter transformer valve group is characterized by comprising: the computer-readable storage medium of claim 5.
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| CN202110240105.4A CN113125946A (en) | 2021-03-04 | 2021-03-04 | Gear adjusting method, medium and system for tap switch of converter transformer valve bank |
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| CN202110240105.4A CN113125946A (en) | 2021-03-04 | 2021-03-04 | Gear adjusting method, medium and system for tap switch of converter transformer valve bank |
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Application publication date: 20210716 |