Power transformer operation error determination method and device based on Euclidean

Abstract

The invention discloses a power transformer operation error determination method and device based on Euclidean. The method comprises the following steps: collecting effective voltage signals output by a secondary side of a plurality of mutual inductors according to a circuit topological relation of the plurality of mutual inductors of a power system, and calculating a plurality of groups of three-phase unbalance degrees of the plurality of mutual inductors; separating power grid error fluctuation in the multiple groups of three-phase unbalance degrees by adopting an Euclidean method, and determining multiple groups of effective three-phase unbalance degrees; screening a three-phase mutual inductor combination corresponding to the effective three-phase unbalance degree with the minimum error from the multiple groups of effective three-phase unbalance degrees as a standard mutual inductor group; and according to the metering error reference standard of the standard mutual inductor group, calculating an amplitude error and a phase error of the power mutual inductor in an operation state.

Description

Technical Field

[0001] The present invention relates to the technical field of mutual inductors, and more specifically, to a method and device for determining an operating error of a power mutual inductor based on rolling elimination. Background Art

[0002] As a key metering instrument, the instrument transformer is widely used in the fields of power trade settlement, relay protection, measurement and control, etc., which is directly related to the fairness of electricity trading settlement and the safety and stability of power grid operation. However, in actual operation, 110kV~500kV instrument transformers are easily affected by ambient temperature, secondary load, electromagnetic field, etc., which will directly lead to a decrease in the measurement accuracy of the power transformer, thereby affecting the stable operation of the power system and the fairness of measurement. A large amount of verification data shows that after a long period of operation, the power transformer may have an error exceeding the allowable value, and the risk of losing control of its metering performance is relatively large, which may lead to huge electric energy metering errors. The error of the instrument transformer during operation will also cause abnormal line loss at the gateway or assessment line. Therefore, the loss of control of the metering performance of the instrument transformer will have a huge impact on the metering gateway trade settlement of the three parties of power generation, supply and use, which will not only question the accuracy and fairness of the gateway measurement, but also easily lead to trade settlement problems and even legal disputes. At present, the on-site calibration of transformers mainly adopts the method of power outage calibration. However, due to the waste of manpower and material resources and the destruction of power supply continuity, a large number of transformers are not calibrated on schedule because the lines are difficult to shut down. Online monitoring of operating errors can currently use the method of comparing the difference of multiple transformer measurement results to determine whether there is a transformer out of tolerance. However, since multiple transformers are affected by the on-site environment and their own aging, there are measurement errors, and there is a lack of reliable amplitude and phase evaluation standards. This method is not very reliable and can only be used as a reference. This leads to technical problems that the error of power transformers may exceed the allowable value after long-term operation. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a method and device for determining operating errors of a power transformer based on rolling elimination.

[0004] According to one aspect of the present invention, a method for determining an operating error of a power transformer based on rolling elimination is provided, comprising:

[0005] According to the circuit topology relationship of multiple transformers in the power system, the effective voltage signals outputted from the secondary sides of multiple transformers are collected, and the unbalance of multiple groups of three-phases of multiple transformers is calculated;

[0006] The grid error fluctuations in multiple groups of three-phase imbalances are separated by the Euclidean elimination method to determine multiple groups of effective three-phase imbalances.

[0007] Selecting a three-phase mutual inductor combination corresponding to an effective three-phase unbalance degree with the smallest error from multiple groups of effective three-phase unbalance degrees as a standard mutual inductor group;

[0008] According to the measurement error reference standard of the standard transformer group, the amplitude error and phase error of the power transformer under the operating state are calculated.

[0009] Optionally, according to the circuit topology relationship of multiple transformers in the power system, effective voltage signals outputted from the secondary sides of the multiple transformers are collected, and multiple groups of three-phase imbalances of the multiple transformers are calculated, including:

[0010] Collect the effective voltage signal output from the secondary side of multiple transformers;

[0011] Based on the laws of electrical physics, multiple groups of three-phase unbalance under all combinations of each phase and each transformer are calculated according to the effective voltage signal.

[0012] Optionally, the calculation formula for multiple groups of three-phase unbalance is:

[0013]

[0014] In the formula, is the effective voltage signal of the nth transformer on phase A, Φ is the three-phase unbalance of the h*h*h group of transformers, where the three-phase unbalance Φ includes the measurement error Φ of the transformer t and grid fluctuation error Φ g .

[0015] Optionally, a rolling elimination method is used to separate grid error fluctuations in multiple groups of three-phase imbalances to determine multiple groups of effective three-phase imbalances, including:

[0016] Bubble sorting is performed on multiple groups of three-phase imbalances to determine the initial minimum imbalance;

[0017] Based on the initial minimum imbalance, the Euclidean elimination method is used to eliminate the grid fluctuation errors in multiple groups of three-phase imbalances and determine multiple groups of effective three-phase imbalances.

[0018] Optionally, a three-phase mutual inductor combination corresponding to an effective three-phase unbalance degree with the smallest error is selected from multiple groups of effective three-phase unbalance degrees as a standard mutual inductor group, including:

[0019] Bubble sorting is performed on multiple groups of effective three-phase unbalance degrees to obtain the maximum effective unbalance degree and the minimum effective unbalance degree;

[0020] According to the maximum effective unbalance, the minimum effective unbalance and the initial minimum unbalance, a three-phase mutual inductor combination with the minimum error among multiple groups of effective unbalance is determined as a standard mutual inductor group.

[0021] Optionally, the determination expression of the three-phase mutual inductor combination with the minimum error is:

[0022] Φ n -Φ P =max(Φ n -Φ l ,Φ n -Φ m )

[0023] In the formula, Φ n is the maximum effective unbalance, Φ m is the minimum effective unbalance, Φ l is the initial minimum imbalance, Φ P is the effective imbalance degree of the pth group with the smallest error.

[0024] Optionally, the measurement error reference standard includes an amplitude reference value and a phase angle reference value, and the amplitude error ε under the operation state of the power transformer is U and phase error θ U The calculation formula is:

[0025]

[0026] θ U =θ r -θ P

[0027] Where U r , U p are the actual amplitude value and the reference amplitude value, θ r ,θ p They are the actual phase angle value and the reference phase angle value respectively.

[0028] According to another aspect of the present invention, there is provided a device for determining an operation error of a power transformer based on rolling elimination, comprising:

[0029] The acquisition module is used to collect the effective voltage signals outputted from the secondary sides of the multiple transformers according to the circuit topology of the multiple transformers in the power system, and calculate the unbalance of multiple groups of three-phases of the multiple transformers;

[0030] A separation module is used to separate the grid error fluctuations in multiple groups of three-phase imbalances by using a rolling elimination method to determine multiple groups of effective three-phase imbalances;

[0031] A screening module, used for screening a three-phase mutual inductor combination corresponding to an effective three-phase unbalance degree with the smallest error from multiple groups of effective three-phase unbalance degrees as a standard mutual inductor group;

[0032] The calculation module is used to calculate the amplitude error and phase error of the power transformer under the operating state according to the measurement error reference standard of the standard transformer group.

[0033] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the storage medium stores a computer program, and the computer program is used to execute the method described in any one of the above aspects of the present invention.

[0034] Optionally, the acquisition module includes:

[0035] The acquisition submodule is used to acquire the effective voltage signal outputted from the secondary side of multiple transformers;

[0036] The calculation submodule is used to calculate multiple groups of three-phase unbalance degrees under all combinations of each transformer of each phase based on the electrical physics law and the effective voltage signal.

[0037] Optionally, the calculation formula for multiple groups of three-phase unbalance is:

[0038]

[0039] In the formula, is the effective voltage signal of the nth transformer on phase A, Φ is the three-phase unbalance of the h*h*h group of transformers, where the three-phase unbalance Φ includes the measurement error Φ of the transformer t and grid fluctuation error Φ g .

[0040] Optionally, the separation module comprises:

[0041] The first sorting submodule is used to perform bubble sorting on multiple groups of three-phase imbalances to determine an initial minimum imbalance;

[0042] The separation submodule is used to eliminate the grid fluctuation error in multiple groups of three-phase imbalances based on the initial minimum imbalance and determine multiple groups of effective three-phase imbalances by using the rolling elimination method.

[0043] Optionally, the screening module comprises:

[0044] The second sorting submodule is used to perform bubble sorting on multiple groups of effective three-phase unbalance degrees to obtain the maximum effective unbalance degree and the minimum effective unbalance degree;

[0045] The determination submodule is used to determine the three-phase mutual inductor combination with the smallest error among multiple groups of effective unbalance as the standard mutual inductor group according to the maximum effective unbalance, the minimum effective unbalance and the initial minimum unbalance.

[0046] Optionally, the determination expression of the three-phase mutual inductor combination with the minimum error is:

[0047] Φ n -Φ P =max(Φ n -Φ l ,Φn -Φ m )

[0048] In the formula, Φ n is the maximum effective unbalance, Φ m is the minimum effective unbalance, Φ l is the initial minimum imbalance, Φ P is the effective imbalance degree of the pth group with the smallest error.

[0049] Optionally, the measurement error reference standard includes an amplitude reference value and a phase angle reference value, and the amplitude error ε under the operation state of the power transformer is U and phase error θ U The calculation formula is:

[0050]

[0051] θ U =θ r -θ P

[0052] Where U r , U p are the actual amplitude value and the reference amplitude value, θ r ,θ p They are the actual phase angle value and the reference phase angle value respectively.

[0053] According to another aspect of the present invention, an electronic device is provided, comprising: a processor; a memory for storing instructions executable by the processor; the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method described in any one of the above aspects of the present invention.

[0054] Therefore, the present invention proposes a method for analyzing the operation error of a power transformer based on rolling elimination. By using the rolling elimination method based on bubble sorting, the voltage fluctuation of the power grid itself is eliminated, and the combination with the smallest transformer synthesis error is obtained, thereby establishing the amplitude and phase reference values, providing a reliable virtual standard for the judgment of the operation error. The metering error is calculated based on the amplitude and phase reference values, and the online monitoring and analysis of the operation error of the power transformer without power outage is realized, which can realize the judgment of the out-of-tolerance state and the location of the abnormality, and provide technical support for improving the accuracy, safety and fairness of gateway metering. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0056] Figure 1 It is a flow chart of a method for determining an operating error of a power transformer based on rolling elimination provided by an exemplary embodiment of the present invention;

[0057] Figure 2 is another flow chart of a method for determining an operating error of a power transformer based on rolling elimination provided by an exemplary embodiment of the present invention;

[0058] Figure 3 is a topological diagram of a typical transformer configuration of a substation provided by an exemplary embodiment of the present invention;

[0059] Figure 4 It is a structural schematic diagram of a device for determining an operating error of a power transformer based on rolling elimination provided by an exemplary embodiment of the present invention;

[0060] Figure 5 This is a structure of an electronic device provided by an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0061] Below, the exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described here.

[0062] It should be noted that the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0063] Those skilled in the art can understand that the terms "first" and "second" in the embodiments of the present invention are only used to distinguish different steps, devices or modules, etc., and neither represent any specific technical meaning nor indicate the necessary logical order between them.

[0064] It should also be understood that, in the embodiments of the present invention, “plurality” may refer to two or more than two, and “at least one” may refer to one, two or more than two.

[0065] It should also be understood that any component, data or structure mentioned in the embodiments of the present invention can generally be understood as one or more, unless explicitly limited or otherwise indicated in the context.

[0066] In addition, the term "and / or" in the present invention is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects before and after are in an "or" relationship.

[0067] It should also be understood that the description of the various embodiments of the present invention focuses on the differences between the various embodiments, and the same or similar aspects thereof can be referenced to each other, and for the sake of brevity, they will not be described one by one.

[0068] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0069] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0070] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0071] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0072] Embodiments of the present invention can be applied to electronic devices such as terminal devices, computer systems, servers, etc., which can operate with many other general or special computing system environments or configurations. Examples of well-known terminal devices, computing systems, environments and / or configurations suitable for use with electronic devices such as terminal devices, computer systems, servers, etc. include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network personal computers, small computer systems, large computer systems, and distributed cloud computing technology environments including any of the above systems, etc.

[0073] Electronic devices such as terminal devices, computer systems, servers, etc. can be described in the general context of computer system executable instructions (such as program modules) executed by computer systems. Generally, program modules can include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. Computer systems / servers can be implemented in a distributed cloud computing environment, where tasks are performed by remote processing devices linked through a communication network. In a distributed cloud computing environment, program modules can be located on local or remote computing system storage media including storage devices.

[0074] Exemplary Methods

[0075] Figure 1 1 is a flow chart of a method for determining an operation error of a power transformer based on rolling elimination provided by an exemplary embodiment of the present invention. This embodiment can be applied to electronic devices, such as Figure 1 As shown, the method 100 for determining the operation error of a power transformer based on rolling elimination includes the following steps:

[0076] Step 101, according to the circuit topology relationship of multiple transformers in the power system, collect the effective voltage signals outputted from the secondary sides of the multiple transformers, and calculate the unbalance degree of multiple groups of three-phases of the multiple transformers;

[0077] Step 102, using the Euclidean elimination method to separate the grid error fluctuations in multiple groups of three-phase imbalances, and determining multiple groups of effective three-phase imbalances;

[0078] Step 103, selecting a three-phase mutual inductor combination corresponding to an effective three-phase unbalance degree with the smallest error from multiple groups of effective three-phase unbalance degrees as a standard mutual inductor group;

[0079] Step 104, calculating the amplitude error and phase error of the power transformer in the operating state according to the measurement error reference standard of the standard transformer group.

[0080] Specifically, the present invention aims at the problem that the error of the power transformer may exceed the allowable value after long-term operation, and proposes a method for analyzing the operation error of the power transformer based on the rolling elimination. Considering that the three-phase imbalance measured by the online monitoring data includes both the metering error of the transformer itself and the voltage fluctuation of the power grid, the rolling elimination method can be used to separate the error fluctuation of the power grid based on the spatiotemporal distribution of multi-transformer data, and obtain a standard transformer combination with the minimum transformer synthesis error, thereby establishing reference values ​​of amplitude and phase to calculate the metering error in the operation state of the transformer, realize the judgment of the transformer out-of-tolerance state and the abnormal location, and improve the accuracy of the gateway metering.

[0081] Specifically, the present invention aims at the problem that errors exceeding the allowable value may be generated after the power transformer has been running for a long time, and proposes a method for analyzing the operation errors of the power transformer based on the elimination of rotation. Considering that the three-phase imbalance measured by the online monitoring data includes both the metering error of the transformer itself and the voltage fluctuation of the power grid, the elimination of rotation method can be used to separate the error fluctuation of the power grid based on the spatiotemporal distribution of multi-transformer data, and obtain a standard transformer combination with the minimum combined transformer error, thereby establishing reference values ​​of amplitude and phase to calculate the metering error in the operation state of the transformer, realize the judgment of the transformer out-of-tolerance state and the location of abnormalities, and improve the accuracy of gateway metering. The following steps are included:

[0082] Step 1: Determine the circuit topology relationship of multiple transformers in the power system, collect valid data of the secondary output of multiple transformers, and calculate the three-phase imbalance of multiple transformers

[0083] Each busbar on the three-phase has h transformers, totaling h groups and 3h transformers. First, collect the valid data of the secondary output of multiple groups of transformers, and calculate the three-phase imbalance of all combinations of each transformer in each phase based on the laws of electrical physics. Taking the voltage transformer as an example, according to the circuit topology and grid operation characteristics, the voltage signal of each phase at time t is The three-phase unbalance Φ of the h*h*h group of transformers can be calculated to satisfy the relationship (1):

[0084]

[0085] The three-phase unbalance measured by online monitoring data includes the measurement error of the transformer Φ t , including the voltage fluctuation of the power grid itself Φ g .

[0086] Therefore, the standard transformer group screening process involved in the present invention sorts the three-phase unbalanced values ​​of the transformers corresponding to the h*h*h group combination before and after removing the power grid fluctuation and environmental influence factors, and selects the final standard transformer, whose corresponding voltage signal amplitude and phase angle are the required standard amplitude and standard phase angle values. The algorithm process finds the three-phase combination with the smallest error as the measurement error reference benchmark, and compares the differences between other transformers and the calculation benchmark respectively, which can provide an effective reference basis for judging whether the transformer group is out of tolerance.

[0087] Step 2: Use the rolling elimination method to separate the grid error fluctuations, select the three-phase combination with the smallest error as the standard transformer group, and obtain the measurement error reference standard

[0088] It is necessary to decouple the imbalance according to the time-space relationship of multiple transformers, separate the power grid fluctuations, and determine the measurement error benchmark. The power grid fluctuations fluctuate in time, but remain consistent on transformers at different spatial locations. This part of the three-phase imbalance is real, identical, and stable, and is 0 under ideal conditions; while the measurement error is different on transformers at different spatial locations, but conforms to the time-constant law on the same transformer. Therefore, based on the time-space distribution of multi-transformer data, the Euclidean elimination method can be used to separate the power grid error fluctuations, find the three-phase combination with the smallest error as the reference benchmark for the measurement error, and determine the measurement error of the four groups of transformers.

[0089] The overall algorithm flow of the rolling elimination method is:

[0090] (1) Bubble sort the unbalance values ​​of the transformers corresponding to the h*h*h group combination, and record the smallest value as the minimum value Φ l ,Right now

[0091] Φ l =min(Φ 1 ,Φ 2 ,Φ 3 ,Φ 4 ,……,Φ h*h*h ) (2)

[0092] (2) Use the rolling elimination method to eliminate the impact of power grid fluctuations Φ g ,Right now:

[0093]

[0094] (3) After eliminating the influence of the power grid and the environment, the processed transformer unbalance values ​​are re-sorted to obtain the minimum and maximum values. and And the corresponding serial numbers m, n, that is:

[0095]

[0096] (4) Compare the initial minimum value Φ l and the minimum value after sorting Φ m , find the minimum value Φ P , and its corresponding transformer combination is the standard transformer finally selected:

[0097] Φ n -Φ P =max(Φ n -Φ l ,Φ n -Φ m ) (6)

[0098] (5)Φ p The amplitude and phase angle of the voltage signal of the corresponding standard transformer combination are the standard amplitude and standard phase angle value U at the required time t. P With θ P . Take P=34 as an example:

[0099]

[0100] At this time, the standard values ​​of phase A, phase B, and phase C are respectively 3 , B 1 , C 2 The corresponding amplitude and phase angle.

[0101] Therefore, the present invention introduces the helical elimination method. Considering that the power grid fluctuation fluctuates in time but remains consistent on the transformers at different spatial positions, and the metering error is different on the transformers at different spatial positions but conforms to a constant law in time. The helical elimination method can make good use of the different spatiotemporal distribution characteristics of the power grid fluctuation error and the transformer metering error, realize the decoupling of the power transformer power grid fluctuation error and its own amplitude and phase angle error, eliminate the power grid fluctuation error in the transformer operation data, and only retain the transformer's own metering error, providing effective data for the subsequent power transformer operation error analysis.

[0102] Step 3: Calculate the amplitude error and phase error of the power transformer under operation according to the measurement error reference standard

[0103] The differences between the four groups of transformers and the reference standard of metering error are compared respectively, and the metering errors of the four groups of transformers are calculated. The metering error of the power transformer consists of two parts: amplitude error and phase error. The amplitude error is the difference between the amplitude of the secondary output voltage of the power transformer and the amplitude of the primary voltage after conversion by the coefficient. The specific expression is shown in formula (8):

[0104]

[0105] Where: U r , U p They are the actual amplitude value and the reference amplitude value respectively.

[0106] The specific expression of phase error is shown in formula (9):

[0107] θ U =θ r -θ P (9)

[0108] Where: θ r ,θ p They are the actual phase angle value and the reference phase angle value respectively.

[0109] Based on the calculation results, it is determined whether the power transformer is out of tolerance. If it is out of tolerance, the specific differences of each transformer in the group are compared to locate the out-of-tolerance transformer.

[0110] The present invention can calculate the measurement error of the mutual inductor according to the difference between the mutual inductor and the calculation reference, judge whether it is out of tolerance, and if it is out of tolerance, compare the specific differences of each mutual inductor in the group to locate the out-of-tolerance mutual inductor.

[0111] Therefore, the present invention proposes a method for analyzing the operation error of a power transformer based on rolling elimination. By using the rolling elimination method based on bubble sorting, the voltage fluctuation of the power grid itself is eliminated, and the combination with the smallest transformer synthesis error is obtained, thereby establishing the amplitude and phase reference values, providing a reliable virtual standard for the judgment of the operation error. The metering error is calculated based on the amplitude and phase reference values, and the online monitoring and analysis of the operation error of the power transformer without power outage is realized, which can realize the judgment of the out-of-tolerance state and the location of the abnormality, and provide technical support for improving the accuracy, safety and fairness of gateway metering.

[0112] Exemplary Devices

[0113] Figure 4 FIG. 1 is a schematic diagram of a structure of a device for determining an operation error of a power transformer based on rotation elimination provided by an exemplary embodiment of the present invention. Figure 4 As shown, the device 400 includes:

[0114] The acquisition module 410 is used to acquire the effective voltage signals outputted from the secondary sides of the multiple transformers according to the circuit topology of the multiple transformers in the power system, and calculate the unbalance of multiple groups of three-phases of the multiple transformers;

[0115] A separation module 420, for separating the grid error fluctuations in the multiple groups of three-phase imbalances by using a rolling elimination method, and determining multiple groups of effective three-phase imbalances;

[0116] A screening module 430 is used to screen a three-phase mutual inductor combination corresponding to an effective three-phase unbalance degree with the smallest error from multiple groups of effective three-phase unbalance degrees as a standard mutual inductor group;

[0117] The calculation module 440 is used to calculate the amplitude error and phase error of the power transformer in the operating state according to the measurement error reference standard of the standard transformer group.

[0118] Optionally, the acquisition module 410 includes:

[0119] The acquisition submodule is used to acquire the effective voltage signal outputted from the secondary side of multiple transformers;

[0120] The calculation submodule is used to calculate multiple groups of three-phase unbalance degrees under all combinations of each transformer of each phase based on the electrical physics law and the effective voltage signal.

[0121] Optionally, the calculation formula for multiple groups of three-phase unbalance is:

[0122]

[0123] In the formula, is the effective voltage signal of the nth transformer on phase A, Φ is the three-phase unbalance of the h*h*h group of transformers, where the three-phase unbalance Φ includes the measurement error Φ of the transformer t and grid fluctuation error Φ g .

[0124] Optionally, the separation module 420 includes:

[0125] The first sorting submodule is used to perform bubble sorting on multiple groups of three-phase imbalances to determine an initial minimum imbalance;

[0126] The separation submodule is used to eliminate the grid fluctuation error in multiple groups of three-phase imbalances based on the initial minimum imbalance and determine multiple groups of effective three-phase imbalances by using the rolling elimination method.

[0127] Optionally, the screening module 430 includes:

[0128] The second sorting submodule is used to perform bubble sorting on multiple groups of effective three-phase unbalance degrees to obtain the maximum effective unbalance degree and the minimum effective unbalance degree;

[0129] The determination submodule is used to determine the three-phase mutual inductor combination with the smallest error among multiple groups of effective unbalance as the standard mutual inductor group according to the maximum effective unbalance, the minimum effective unbalance and the initial minimum unbalance.

[0130] Optionally, the determination expression of the three-phase mutual inductor combination with the minimum error is:

[0131] Φ n -Φ P =max(Φ n -Φ l ,Φ n -Φ m )

[0132] In the formula, Φ n is the maximum effective unbalance, Φ m is the minimum effective unbalance, Φ l is the initial minimum imbalance, Φ P is the effective imbalance degree of the pth group with the smallest error.

[0133] Optionally, the measurement error reference standard includes an amplitude reference value and a phase angle reference value, and the amplitude error ε under the operation state of the power transformer is U and phase error θ U The calculation formula is:

[0134]

[0135] θ U =θ r -θ P

[0136] Where U r , U p are the actual amplitude value and the reference amplitude value, θ r ,θ p They are the actual phase angle value and the reference phase angle value respectively.

[0137] Exemplary Electronic Devices

[0138] Figure 5 This is a structure of an electronic device provided by an exemplary embodiment of the present invention. Figure 5 As shown, the electronic device 50 includes one or more processors 51 and a memory 52 .

[0139] The processor 51 may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.

[0140] The memory 52 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory (cache), etc. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 51 may run the program instructions to implement the methods of the software programs of the various embodiments of the present invention described above and / or other desired functions. In one example, the electronic device may also include: an input device 53 and an output device 54, which are interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0141] In addition, the input device 53 may also include, for example, a keyboard, a mouse, etc.

[0142] The output device 54 can output various information to the outside. The output device 54 can include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto.

[0143] Of course, to simplify, Figure 5 Only some of the components related to the present invention in the electronic device are shown, and components such as a bus, an input / output interface, etc. are omitted. In addition, the electronic device may further include any other appropriate components according to specific application conditions.

[0144] Exemplary computer program products and computer-readable storage media

[0145] In addition to the above-mentioned methods and devices, an embodiment of the present invention may also be a computer program product, which includes computer program instructions, which, when executed by a processor, enable the processor to execute the steps of the method according to various embodiments of the present invention described in the above-mentioned "Exemplary Method" section of this specification.

[0146] The computer program product may be written in any combination of one or more programming languages ​​to write program code for performing the operations of the embodiments of the present invention, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0147] In addition, an embodiment of the present invention may also be a computer-readable storage medium having computer program instructions stored thereon, which, when executed by a processor, enable the processor to execute the steps of the method according to various embodiments of the present invention described in the above “Exemplary Method” section of this specification.

[0148] The computer readable storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can include, for example, but is not limited to, a system, system or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0149] The basic principle of the present invention is described above in conjunction with specific embodiments. However, it should be pointed out that the advantages, strengths, effects, etc. mentioned in the present invention are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. must be possessed by each embodiment of the present invention. In addition, the specific details disclosed above are only for the purpose of illustration and facilitation of understanding, rather than limitation, and the above details do not limit the present invention to being implemented by adopting the above specific details.

[0150] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the system embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0151] The block diagrams of the devices, systems, equipment, and systems involved in the present invention are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, systems, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The word "such as" used here refers to the phrase "such as but not limited to", and can be used interchangeably with it.

[0152] The method and system of the present invention may be implemented in many ways. For example, the method and system of the present invention may be implemented by software, hardware, firmware or any combination of software, hardware, firmware. The above order of steps for the method is only for illustration, and the steps of the method of the present invention are not limited to the order specifically described above, unless otherwise specifically stated. In addition, in some embodiments, the present invention may also be implemented as a program recorded in a recording medium, which includes machine-readable instructions for implementing the method according to the present invention. Thus, the present invention also covers a recording medium storing a program for executing the method according to the present invention.

[0153] It should also be noted that in the system, device and method of the present invention, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent schemes of the present invention. The above description of the disclosed aspects is provided to enable any technician in the field to make or use the present invention. Various modifications to these aspects are very obvious to those skilled in the art, and the general principles defined here can be applied to other aspects without departing from the scope of the present invention. Therefore, the present invention is not intended to be limited to the aspects shown here, but in accordance with the widest range consistent with the principles and novel features disclosed here.

[0154] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present invention to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A method for determining the operating error of a power transformer based on rolling elimination, characterized in that: include: According to the circuit topology relationship of multiple transformers in the power system, the effective voltage signals outputted from the secondary sides of multiple transformers are collected, and the unbalance of multiple groups of three-phases of multiple transformers is calculated; The grid error fluctuations in multiple groups of three-phase imbalances are separated by the Euclidean elimination method to determine multiple groups of effective three-phase imbalances. Selecting a three-phase mutual inductor combination corresponding to an effective three-phase unbalance degree with the smallest error from multiple groups of effective three-phase unbalance degrees as a standard mutual inductor group; According to the measurement error reference standard of the standard transformer group, the amplitude error and phase error of the power transformer in the operating state are calculated.

2. The method according to claim 1, characterized in that According to the circuit topology of multiple transformers in the power system, the effective voltage signals outputted from the secondary side of multiple transformers are collected, and the unbalance of multiple groups of three-phase transformers is calculated, including: Collect the effective voltage signal output from the secondary side of multiple transformers; Based on the electrical physics law, multiple groups of three-phase unbalance degrees under all combinations of each transformer of each phase are calculated according to the effective voltage signal.

3. The method according to claim 2, characterized in that The calculation formula for multiple groups of three-phase unbalance is: In the formula, is the effective voltage signal of the nth transformer on phase A, Φ is the three-phase unbalance of the h*h*h group of transformers, where the three-phase unbalance Φ includes the measurement error Φ of the transformer t and grid fluctuation error Φ g .

4. The method according to claim 1, characterized in that The Euclidean elimination method is used to separate the grid error fluctuations in multiple groups of three-phase imbalances and determine multiple groups of effective three-phase imbalances, including: Bubble sorting is performed on multiple groups of three-phase imbalances to determine the initial minimum imbalance; Based on the initial minimum imbalance, the Euclidean elimination method is used to eliminate the grid fluctuation errors in multiple groups of three-phase imbalances, and multiple groups of effective three-phase imbalances are determined.

5. The method according to claim 4, characterized in that A three-phase mutual inductor combination corresponding to the effective three-phase unbalance degree with the smallest error is selected from multiple groups of effective three-phase unbalance degrees as a standard mutual inductor group, including: Bubble sorting is performed on multiple groups of effective three-phase unbalance degrees to obtain the maximum effective unbalance degree and the minimum effective unbalance degree; According to the maximum effective unbalance, the minimum effective unbalance and the initial minimum unbalance, a three-phase mutual inductor combination with the minimum error among multiple groups of effective unbalance is determined as the standard mutual inductor group.

6. The method according to claim 5, characterized in that The determination expression of the three-phase mutual inductor combination with the minimum error is: F n -F P =max(Φ n -F l ,F n -F m ) In the formula, Φ n is the maximum effective unbalance, Φ m is the minimum effective unbalance, Φ l is the initial minimum imbalance, Φ P is the effective imbalance degree of the pth group with the smallest error.

7. The method according to claim 1, characterized in that The measurement error reference standard includes an amplitude reference value and a phase angle reference value, and the amplitude error ε under the operating state of the power transformer U and phase error θ U The calculation formula is: i U =θ r -θ P Where U r , U p are the actual amplitude value and the reference amplitude value, θ r ,θ p They are the actual phase angle value and the reference phase angle value respectively.

8. A device for determining operation error of a power transformer based on rolling elimination, characterized in that: include: The acquisition module is used to collect the effective voltage signals outputted from the secondary sides of the multiple transformers according to the circuit topology of the multiple transformers in the power system, and calculate the unbalance of multiple groups of three-phases of the multiple transformers; A separation module is used to separate the grid error fluctuations in multiple groups of three-phase imbalances by using a rolling elimination method to determine multiple groups of effective three-phase imbalances; A screening module, used for screening a three-phase mutual inductor combination corresponding to an effective three-phase unbalance degree with the smallest error from multiple groups of effective three-phase unbalance degrees as a standard mutual inductor group; The calculation module is used to calculate the amplitude error and phase error of the power transformer under the operating state according to the measurement error reference standard of the standard transformer group.

9. The device according to claim 8, characterized in that Acquisition module, including: The acquisition submodule is used to acquire the effective voltage signal outputted from the secondary side of multiple transformers; The calculation submodule is used to calculate multiple groups of three-phase unbalance degrees under all combinations of each transformer of each phase based on the effective voltage signal based on the electrical physics law.

10. The device according to claim 8, characterized in that Separation module, including: The first sorting submodule is used to perform bubble sorting on multiple groups of three-phase imbalances to determine an initial minimum imbalance; The separation submodule is used to eliminate the grid fluctuation errors in multiple groups of three-phase imbalances based on the initial minimum imbalance and determine multiple groups of effective three-phase imbalances by using the rolling elimination method.

11. The device according to claim 10, characterized in that Screening modules include: The second sorting submodule is used to perform bubble sorting on multiple groups of effective three-phase unbalance degrees to obtain the maximum effective unbalance degree and the minimum effective unbalance degree; The determination submodule is used to determine, according to the maximum effective unbalance, the minimum effective unbalance and the initial minimum unbalance, a three-phase mutual inductor combination with the smallest error among multiple groups of effective unbalance as the standard mutual inductor group.

12. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and the computer program is used to execute the method according to any one of claims 1 to 7.

13. An electronic device, characterized in that: The electronic device comprises: processor; a memory for storing instructions executable by the processor; The processor is used to read the executable instructions from the memory and execute the instructions to implement the method described in any one of claims 1 to 7.

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