CN110826011A - Method and system for judging whether multiple transformers can be grouped - Google Patents

Method and system for judging whether multiple transformers can be grouped Download PDF

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CN110826011A
CN110826011A CN201910963379.9A CN201910963379A CN110826011A CN 110826011 A CN110826011 A CN 110826011A CN 201910963379 A CN201910963379 A CN 201910963379A CN 110826011 A CN110826011 A CN 110826011A
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transformers
grouped
ratio
transformer
condition
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CN110826011B (en
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刘鑫
朱仲贤
常文婧
杜鹏
魏南
程燕
樊磊
窦晨
柏跃润
王婧弘
张驰
张征凯
李永煦
王阳
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State Grid Corp of China SGCC
Maintenace Co of State Grid Anhui Electric Power Co Ltd
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State Grid Corp of China SGCC
Maintenace Co of State Grid Anhui Electric Power Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/11—Complex mathematical operations for solving equations, e.g. nonlinear equations, general mathematical optimization problems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications

Abstract

The embodiment of the invention provides a method and a system for judging whether a plurality of transformers can be grouped, and belongs to the technical field of ultrahigh power transformers. The method comprises the following steps: determining the number of the plurality of transformers; in the case of the number of 2, calculating the variation ratio deviation by adopting the formula (1); judging whether the variation ratio deviation is larger than a first preset value or not; under the condition that the deviation of the transformation ratio is judged to be less than or equal to a first preset value, calculating the load capacity of the transformer according to a formula (2) and a formula (3); calculating the capacity ratio of the transformer according to the load capacity, and judging whether the capacity ratio meets a preset condition; under the condition that the capacity ratio is judged to meet the preset condition, the circulating current of the parallel operation of the transformers is calculated according to a formula (4); respectively calculating the ratio of the circulating current to the rated current of each transformer; judging whether each ratio is smaller than or equal to a second preset value; and under the condition that each ratio is judged to be smaller than or equal to the second preset value, determining that the plurality of transformers can be grouped.

Description

Method and system for judging whether multiple transformers can be grouped
Technical Field
The invention relates to the technical field of ultrahigh power transformers, in particular to a method and a system for judging whether a plurality of transformers can be grouped.
Background
With the continuous acceleration of the urbanization process, the main variable capacity of the 500kV transformer substation operated in the 90 s of the 20 th century cannot meet the current power load requirement, so that the original transformer substation can be expanded and augmented. The whole process period is long, the design and manufacturing process of the transformer is advanced quickly, and the transformer put into operation at the later stage is not matched with the original transformer parameters. The original transformer still has a service life, and the condition that the parameters are not matched with the ultrahigh voltage power transformer to run in parallel for a long time inevitably occurs. The unmatched parameters mainly refer to capacity, rated voltage transformation ratio, high and medium impedance and the like, which can cause the conditions of uneven power distribution, large circulating current and the like of the transformer.
Disclosure of Invention
The invention aims to provide a method and a system for judging whether a plurality of transformers can be grouped, and the method and the system can judge whether different transformers can be grouped, so that the grouped transformers can work efficiently and stably.
In order to achieve the above object, an embodiment of the present invention provides a method for determining whether a plurality of transformers can be grouped, the method including:
determining the number of the plurality of transformers;
in the case that the number is 2, calculating a transformation ratio deviation of the transformer using equation (1),
Figure BDA0002229704910000011
where Δ k is the ratio deviation, k1Is the transformation ratio, k, of one said transformer2Is the transformation ratio of another transformer,
judging whether the transformation ratio deviation is greater than a first preset value or not;
under the condition that the deviation of the transformation ratio is judged to be less than or equal to the first preset value, calculating the distributed load capacity of the transformer under the condition that the transformer is simultaneously connected into the transformer substation according to a formula (2) and a formula (3),
Figure BDA0002229704910000021
Figure BDA0002229704910000022
wherein S is1Is the load capacity, S, of one said transformer2For the load capacity of the other of said transformers,
Figure BDA0002229704910000023
is the impedance of one of the transformers,is the impedance of the other of said transformers;
calculating the capacity ratio of the transformer according to the load capacity, and judging whether the capacity ratio meets a preset condition;
under the condition that the capacity ratio is judged to meet the preset condition, the circulating current when the transformers run in parallel is calculated according to a formula (4),
Figure BDA0002229704910000025
wherein, IcFor said circulating current, U1Is the load voltage of the substation;
respectively calculating the ratio of the circulating current to the rated current of each transformer;
judging whether each ratio is smaller than or equal to a second preset value;
and under the condition that each ratio is judged to be less than or equal to the second preset value, determining that a plurality of transformers can be grouped.
Optionally, the method comprises:
in the case that the number is determined to be 3, calculating the ratio deviation of any two transformers by adopting a formula (5),
where Δ k is the ratio deviation, k1For the transformation ratio, k, of one of any two of said transformers2For another of every two transformersThe transformation ratio of the transformer;
respectively judging whether each transformation ratio deviation is smaller than or equal to the first preset value;
under the condition that each transformation ratio deviation is judged to be less than or equal to the first preset value, the distributed load capacity of any two transformers under the condition that the transformers are simultaneously connected into the transformer substation is calculated according to a formula (6) and a formula (7),
Figure BDA0002229704910000031
Figure BDA0002229704910000032
wherein S is1Load capacity, S, of one of any two of said transformers2For the load capacity of the other of any two of the transformers,
Figure BDA0002229704910000033
for the impedance of one of any two of the transformers,
Figure BDA0002229704910000034
impedance of the other of any two of the transformers;
calculating the capacity ratio of any two transformers according to the load capacity, and judging whether the capacity ratio meets the preset condition;
calculating a circulating current when the transformers are operated in parallel according to the formula (8) to the formula (11) under the condition that the capacity ratio is judged to meet the preset condition,
Figure BDA0002229704910000035
Figure BDA0002229704910000036
Figure BDA0002229704910000037
Figure BDA0002229704910000038
wherein, I1The circulating current, I, of one of the transformers2The circulating current, I, of another one of said transformers3The circulating current, I, of another one of the transformersLIs the rated current of the transformer, Z1Impedance of one of said transformers, Z2Impedance of another one of said transformers, Z3Impedance, k, of another one of said transformers1Transformation ratio, k, for one of said transformers2For the transformation ratio, k, of another one of said transformers3A transformation ratio for another one of the transformers;
respectively calculating the ratio of the circulating current to the rated current of the transformer;
judging whether each ratio is smaller than or equal to a second preset value;
and under the condition that each ratio is judged to be less than or equal to the second preset value, determining that a plurality of transformers can be grouped.
Optionally, the method further comprises:
and under the conditions that the deviation of the transformation ratio is judged to be larger than the first preset value, any deviation of the transformation ratio is larger than the first preset value, the capacity ratio does not meet the preset condition and/or any ratio is larger than the second preset value, it is determined that the plurality of transformers cannot be grouped.
The invention also provides a system for determining whether a plurality of transformers can be grouped, the system comprising a processor for performing the method as described in any one of the above.
In another aspect, the present invention provides a method for determining a grouping scheme of transformers, the method comprising:
randomly selecting two transformers from the plurality of transformers;
judging whether the selected transformers can be grouped or not by adopting the method;
under the condition that the selected transformers can be grouped, the selected transformers are grouped, and the selected transformers are deleted from the plurality of transformers;
judging whether the number of the grouped transformers is larger than or equal to a preset grouping value or not;
under the condition that whether the number of the grouped transformers is larger than or equal to the grouping value or not is judged, outputting the grouped transformers and finishing the method;
and under the condition that the selected transformers cannot be grouped, randomly selecting two transformers from the plurality of transformers again.
The invention also provides a method for determining a grouping scheme of transformers, the method comprising:
randomly selecting three transformers from the plurality of transformers;
judging whether the selected transformers can be grouped or not by adopting any one of the methods;
under the condition that the selected transformers can be grouped, the selected transformers are grouped, and the selected transformers are deleted from the plurality of transformers;
judging whether the number of the grouped transformers is larger than or equal to a preset grouping value or not;
under the condition that whether the number of the grouped transformers is larger than or equal to the grouping value or not is judged, outputting the grouped transformers and finishing the method;
and under the condition that the selected transformers cannot be grouped, randomly selecting three transformers from the plurality of transformers again.
The invention also provides a system for determining a grouping scheme of transformers, the system comprising a processor for performing the method according to any one of the preceding claims.
In yet another aspect, the present invention provides a method for detecting a substation transformer plan, the method comprising:
judging whether each group of transformers in the transformer substation can be grouped by adopting the method;
and marking the group of the transformers which cannot be grouped in the transformer substation as an abnormal group.
The invention also provides a system for detecting substation transformer planning, comprising a processor for performing the method as described above.
In yet another aspect, the present invention also provides a storage medium storing instructions for reading by a machine to cause the machine to perform a method as claimed in any one of the above.
Through the technical scheme:
the method and the system for judging whether the plurality of transformers can be grouped respectively calculate the transformation deviation, the load capacity and the circulating current of the transformers, and judge by adopting a plurality of preset conditions based on the calculated numerical values, so as to determine whether the plurality of transformers can be grouped, and the grouped transformers can work efficiently and stably;
the method and the system for determining the matching scheme of the transformer can determine the matching mode of the transformer by determining whether two or three transformers in different models can be grouped, so that the matched transformer can work safely and stably;
the method and the system for detecting the transformer planning of the transformer substation can detect each matched group of transformers of the transformer substation, determine whether the transformers of each group can meet the matching condition, and mark the group which does not meet the matching condition, thereby determining that the transformer substation works safely and stably.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
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The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a flow diagram of a method for determining whether a plurality of transformers can be grouped according to one embodiment of the invention;
FIG. 2 is a partial flow diagram of a method for determining whether a plurality of transformers can be grouped according to one embodiment of the invention;
FIG. 3 is a flow diagram of a method for determining a grouping scheme for transformers according to one embodiment of the invention;
FIG. 4 is a flow diagram of a method for determining a grouping scheme for transformers according to one embodiment of the invention;
fig. 5 is a flow chart of a method for detecting substation transformer planning according to an embodiment of the invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
In the embodiments of the present invention, unless otherwise specified, the use of directional terms such as "upper, lower, top, and bottom" is generally used with respect to the orientation shown in the drawings or the positional relationship of the components with respect to each other in the vertical, or gravitational direction.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between the various embodiments can be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not be within the protection scope of the present invention.
FIG. 1 shows a method for determining whether a plurality of transformers are capable of being used in accordance with one embodiment of the present invention
In step S10, the number of the plurality of transformers is determined.
In step S11, in the case where the number is 2, the ratio deviation of the transformer is calculated using equation (1),
Figure BDA0002229704910000071
where Δ k is the variation ratio deviation, k1Is the transformation ratio, k, of a transformer2The transformation ratio of another transformer;
in step S12, it is determined whether the variation is larger than a first preset value. The first preset value can be determined by the selection rule of the actual transformer by the skilled person. In this embodiment, the first preset value may be, for example, 0.5%, taking into account the relevant provisions of the document "power transformer operating regulations". In addition, the fact that the transformation ratio deviation is too large means that the inconsistency of the transformers is too large, and after the two transformers are grouped, not only is the working efficiency low, but also the potential safety hazard is great. Therefore, in the case where it is determined that the ratio deviation is greater than the second preset value, which indicates that the two transformers cannot be grouped, step S19 may be performed.
In step S13, in the case where it is determined that the variation in the transformation ratio is less than or equal to the first preset value, the distributed load capacity of the transformer in the case where the transformer is connected to the substation at the same time is calculated according to the formula (2) and the formula (3),
Figure BDA0002229704910000081
Figure BDA0002229704910000082
wherein S is1Is the load capacity of one transformer, S2Is the load capacity of another transformer,
Figure BDA0002229704910000083
is the impedance of one transformer and is,
Figure BDA0002229704910000084
impedance of another transformer;
in step S14, the capacity ratio of the transformer is calculated from the load capacity, and it is determined whether the capacity ratio satisfies a predetermined condition. Wherein, the predetermined condition can be determined by the person in the art based on the selection rule of the transformer. In this embodiment, the preset condition may be, for example, whether the capacity ratio is within the interval range of the interval [0.5,2] according to the relevant provisions of the document "power transformer operating regulations". In addition, when the capacity ratio is not within the interval [0.5,2], it is described that the inconsistency between the two transformers is too large, and the two transformers are grouped to have low working efficiency and great potential safety hazard. Therefore, in this embodiment, in the case where it is determined that the capacity ratio does not satisfy the predetermined condition, which means that the two transformers cannot be grouped, step S19 may be executed.
In step S15, when the capacity ratio is judged to satisfy the predetermined condition, the circulating current in the parallel operation of the transformers is calculated according to the formula (4),
Figure BDA0002229704910000085
wherein, IcIs a circulating current，U1Is the load voltage of the substation;
in step S16, calculating the ratio of the circulating current to the rated current of each transformer;
in step S17, it is determined whether each ratio is less than or equal to a second preset value. The preset value can be determined by a person skilled in the art based on the selection principle of the transformer. In this embodiment, the second preset value may be, for example, 10%, according to the relevant provisions of the document "power transformer operating regulations". In addition, the ratio is larger than the second preset value, which means that the inconsistency of the two transformers is too large, and the two transformers are grouped, so that the working efficiency is low, and the potential safety hazard is also large. Therefore, in this embodiment, in the case where it is determined that any ratio is greater than the second preset value, which indicates that the two transformers cannot be grouped, step S19 may be executed.
In step S18, in the case where it is determined that each ratio is less than or equal to the second preset value, it is determined that the plurality of transformers can be grouped.
In one embodiment of the invention, considering that the number of transformers selected may also be 3, the method may then comprise the steps as shown in fig. 2 in case the number of transformers is 3. In fig. 2, the method may further include:
in step S20, in the case where the determination number is 3, the ratio deviation of any two transformers is calculated using equation (5),
Figure BDA0002229704910000091
where Δ k is the variation ratio deviation, k1Is the transformation ratio, k, of one of any two transformers2The voltage transformation ratio of the other transformer in every two transformers;
in step S21, it is determined whether each of the ratio deviations is less than or equal to a first preset value, respectively. In the case where it is determined that any ratio deviation is greater than the first preset value, which indicates that the three transformers cannot be grouped, step S28 may be executed.
In step S22, in the case where it is determined that each of the variation ratios is less than or equal to the first preset value, the distributed load capacities of any two transformers in the case where the two transformers are simultaneously connected to the substation are calculated according to the formula (6) and the formula (7),
Figure BDA0002229704910000101
wherein S is1For the load capacity, S, of one of any two transformers2The load capacity of the other of any two transformers,
Figure BDA0002229704910000103
the impedance of one of any two transformers,
Figure BDA0002229704910000104
impedance of the other transformer of any two transformers;
in step S23, the capacity ratio of any two transformers is calculated from the load capacity, and it is determined whether the capacity ratio satisfies a predetermined condition. If it is determined that any capacity ratio does not satisfy the predetermined condition, which means that three transformers cannot be grouped, step S28 may be executed.
In step S24, when it is judged that the capacity ratio satisfies the predetermined condition, the circulating current at the time of parallel operation of the transformers is calculated from the equations (8) to (11),
Figure BDA0002229704910000105
Figure BDA0002229704910000106
Figure BDA0002229704910000107
Figure BDA0002229704910000108
wherein, I1The circulating current, I, for one of a plurality of transformers2The circulating current of another transformer of the plurality of transformers, I3Circulating current for another one of the transformers, ILFor rated current of transformer, Z1Impedance of one transformer of a plurality of transformers, Z2Is the impedance of another transformer of the plurality of transformers, Z3Impedance, k, of a further transformer of the plurality of transformers1For the transformation ratio, k, of one of a plurality of transformers2Is the transformation ratio, k, of another transformer of the plurality of transformers3The transformation ratio of another transformer in the plurality of transformers;
in step S25, the ratio of the circulating current to the rated current of the transformer is calculated;
in step S26, it is determined whether each ratio is less than or equal to a second preset value. If it is determined that any ratio is greater than the second preset value, which indicates that the three transformers cannot be grouped, step S28 may be executed.
In step S27, in the case where it is determined that each ratio is less than or equal to the second preset value, it is determined that the plurality of transformers can be grouped.
In another aspect, the present invention also provides a system for determining whether a plurality of transformers can be grouped, which may include a processor that may be configured to perform a method as illustrated in fig. 1 or fig. 2.
In another aspect, the present invention provides a method for determining a grouping scheme of transformers, as shown in fig. 3, the method comprising:
in step S30, two transformers are randomly selected from the plurality of transformers;
in step S31, determining whether the selected transformers can be grouped by using the method shown in fig. 1;
in step S32, under the condition that it is determined that the selected transformers can be grouped, grouping the selected transformers, and deleting the selected transformers from the plurality of transformers;
in step S33, determining whether the number of grouped transformers is greater than or equal to a preset grouping value;
in step S34, in case that it is determined whether the number of grouped transformers is greater than or equal to the grouping value, which indicates that the number of transformers requiring grouping is sufficient, the grouped transformers may be output and the method may be ended;
and under the condition that the selected transformers cannot be grouped, randomly selecting two transformers from the plurality of transformers again.
The present invention also provides a method for determining a grouping scheme of transformers, which may include:
in step S40, three transformers are randomly selected from the plurality of transformers;
in step S41, it is determined whether the selected transformers can be grouped by using the method as shown in fig. 2;
in step S42, under the condition that it is determined that the selected transformers can be grouped, grouping the selected transformers, and deleting the selected transformers from the plurality of transformers;
in step S43, determining whether the number of grouped transformers is greater than or equal to a preset grouping value;
in step S44, in case that it is determined whether the number of grouped transformers is greater than or equal to the grouping value, which indicates that the number of transformers requiring grouping is sufficient, the grouped transformers may be output and the method may be ended;
and under the condition that the selected transformers cannot be grouped, randomly selecting three transformers from the plurality of transformers again.
The present invention also provides a system for determining a grouping scheme for transformers, which may include a processor that may be configured to perform a method as shown in fig. 3 or fig. 4.
In yet another aspect, the present invention provides a method for detecting a substation transformer plan, which may include:
in step S51, determining whether each group of transformers in the substation can be grouped by using the method as in fig. 1 or fig. 2;
in step S52, the group in which the transformer that cannot be grouped in the substation is located is marked as an abnormal group.
The present invention also provides a system for detecting substation transformer plans, which may include a processor, which may be used to perform a method as illustrated in fig. 5.
In yet another aspect, the present invention also provides a storage medium that may store instructions that are readable by a machine to cause the machine to perform a method as illustrated in any one of fig. 1-5.
Through the technical scheme:
the method and the system for judging whether the plurality of transformers can be grouped respectively calculate the transformation deviation, the load capacity and the circulating current of the transformers, and judge by adopting a plurality of preset conditions based on the calculated numerical values, so as to determine whether the plurality of transformers can be grouped, and the grouped transformers can work efficiently and stably;
the method and the system for determining the matching scheme of the transformer can determine the matching mode of the transformer by determining whether two or three transformers in different models can be grouped, so that the matched transformer can work safely and stably;
the method and the system for detecting the transformer planning of the transformer substation can detect each matched group of transformers of the transformer substation, determine whether the transformers of each group can meet the matching condition, and mark the group which does not meet the matching condition, thereby determining that the transformer substation works safely and stably.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solution of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention will not be described separately for the various possible combinations.
Those skilled in the art can understand that all or part of the steps in the method for implementing the above embodiments may be implemented by a program to instruct related hardware, where the program is stored in a storage medium and includes several instructions to enable a (may be a single chip, a chip, etc.) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, various different embodiments of the present invention may be arbitrarily combined with each other, and the embodiments of the present invention should be considered as disclosed in the disclosure of the embodiments of the present invention as long as the embodiments do not depart from the spirit of the embodiments of the present invention.

Claims (10)

1. A method for determining whether a plurality of transformers can be grouped, the method comprising:
determining the number of the plurality of transformers;
in the case that the number is 2, calculating a transformation ratio deviation of the transformer using equation (1),
where Δ k is the ratio deviation, k1Is the transformation ratio, k, of one said transformer2Is the transformation ratio of another transformer,
judging whether the transformation ratio deviation is greater than a first preset value or not;
under the condition that the deviation of the transformation ratio is judged to be less than or equal to the first preset value, calculating the distributed load capacity of the transformer under the condition that the transformer is simultaneously connected into the transformer substation according to a formula (2) and a formula (3),
Figure FDA0002229704900000012
Figure FDA0002229704900000013
wherein S is1Is the load capacity, S, of one said transformer2For the load capacity of the other of said transformers,
Figure FDA0002229704900000014
is the impedance of one of the transformers,
Figure FDA0002229704900000015
is the impedance of the other of said transformers;
calculating the capacity ratio of the transformer according to the load capacity, and judging whether the capacity ratio meets a preset condition;
under the condition that the capacity ratio is judged to meet the preset condition, the circulating current when the transformers run in parallel is calculated according to a formula (4),
Figure FDA0002229704900000016
wherein, IcFor said circulating current, U1Is the load voltage of the substation；
Respectively calculating the ratio of the circulating current to the rated current of each transformer;
judging whether each ratio is smaller than or equal to a second preset value;
and under the condition that each ratio is judged to be less than or equal to the second preset value, determining that a plurality of transformers can be grouped.
2. The method according to claim 1, characterized in that it comprises:
in the case that the number is determined to be 3, calculating the ratio deviation of any two transformers by adopting a formula (5),
Figure FDA0002229704900000021
where Δ k is the ratio deviation, k1For the transformation ratio, k, of one of any two of said transformers2The transformation ratio of the other transformer in every two transformers;
respectively judging whether each transformation ratio deviation is smaller than or equal to the first preset value;
under the condition that each transformation ratio deviation is judged to be less than or equal to the first preset value, the distributed load capacity of any two transformers under the condition that the transformers are simultaneously connected into the transformer substation is calculated according to a formula (6) and a formula (7),
Figure FDA0002229704900000022
Figure FDA0002229704900000023
wherein S is1Load capacity, S, of one of any two of said transformers2For the load capacity of the other of any two of the transformers,for the impedance of one of any two of the transformers,
Figure FDA0002229704900000025
impedance of the other of any two of the transformers;
calculating the capacity ratio of any two transformers according to the load capacity, and judging whether the capacity ratio meets the preset condition;
calculating a circulating current when the transformers are operated in parallel according to the formula (8) to the formula (11) under the condition that the capacity ratio is judged to meet the preset condition,
Figure FDA0002229704900000026
Figure FDA0002229704900000031
Figure FDA0002229704900000032
Figure FDA0002229704900000033
wherein, I1The circulating current, I, of one of the transformers2The circulating current, I, of another one of said transformers3The circulating current, I, of another one of the transformersLIs the rated current of the transformer, Z1Impedance of one of said transformers, Z2Impedance of another one of said transformers, Z3For another one of said transformersImpedance, k1Transformation ratio, k, for one of said transformers2For the transformation ratio, k, of another one of said transformers3A transformation ratio for another one of the transformers;
respectively calculating the ratio of the circulating current to the rated current of the transformer;
judging whether each ratio is smaller than or equal to a second preset value;
and under the condition that each ratio is judged to be less than or equal to the second preset value, determining that a plurality of transformers can be grouped.
3. The method of claim 2, further comprising:
and under the conditions that the deviation of the transformation ratio is judged to be larger than the first preset value, any deviation of the transformation ratio is larger than the first preset value, the capacity ratio does not meet the preset condition and/or any ratio is larger than the second preset value, it is determined that the plurality of transformers cannot be grouped.
4. A system for determining whether a plurality of transformers can be grouped, the system comprising a processor configured to perform the method of any of claims 1 to 3.
5. A method for determining a grouping scheme for transformers, the method comprising:
randomly selecting two transformers from the plurality of transformers;
determining whether the selected transformers can be grouped by using the method of claim 1;
under the condition that the selected transformers can be grouped, the selected transformers are grouped, and the selected transformers are deleted from the plurality of transformers;
judging whether the number of the grouped transformers is larger than or equal to a preset grouping value or not;
under the condition that whether the number of the grouped transformers is larger than or equal to the grouping value or not is judged, outputting the grouped transformers and finishing the method;
and under the condition that the selected transformers cannot be grouped, randomly selecting two transformers from the plurality of transformers again.
6. A method for determining a grouping scheme for transformers, the method comprising:
randomly selecting three transformers from the plurality of transformers;
judging whether the selected transformers can be grouped by adopting the method according to any one of claims 2 or 3;
under the condition that the selected transformers can be grouped, the selected transformers are grouped, and the selected transformers are deleted from the plurality of transformers;
judging whether the number of the grouped transformers is larger than or equal to a preset grouping value or not;
under the condition that whether the number of the grouped transformers is larger than or equal to the grouping value or not is judged, outputting the grouped transformers and finishing the method;
and under the condition that the selected transformers cannot be grouped, randomly selecting three transformers from the plurality of transformers again.
7. A system for determining a grouping scheme for transformers, the system comprising a processor configured to perform the method of claim 5 or 6.
8. A method for detecting substation transformer planning, the method comprising:
judging whether each group of transformers in the substation can be grouped by adopting the method of any one of claims 1 to 3;
and marking the group of the transformers which cannot be grouped in the transformer substation as an abnormal group.
9. A system for testing substation transformer plans, characterized in that the system comprises a processor for performing the method of claim 8.
10. A storage medium storing instructions for reading by a machine to cause the machine to perform the method of any one of claims 1, 2, 3, 5, 6 and 8.
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