CN113552525B - Error estimation method, device and equipment of voltage transformer and storage medium - Google Patents
Error estimation method, device and equipment of voltage transformer and storage medium Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses an error estimation method, device, equipment and storage medium of a voltage transformer, and a self-defined voltage true value is initialized; determining an objective function according to the actual measured value of the voltage transformer and the self-defined voltage true value, wherein the objective function is used for representing the error of the measured value; adjusting the self-defined voltage true value according to the error represented by the objective function to obtain the objective voltage true value; and determining error data of the target voltage transformer according to the true value of the target voltage. The self-defined voltage true value can be adjusted through the error of the objective function without power failure of the voltage transformer, so that the adjusted target voltage true value approaches to the true voltage true value. And then the data of the target voltage transformer can be determined according to the true value of the target voltage. The above process does not resort to a physical etalon of a higher level of accuracy, thus enabling a reduction in verification costs; meanwhile, the voltage transformer does not need to be powered off, so that the smoothness of a circuit can be kept, and the utilization rate of the circuit is further improved.
Description
Technical Field
The embodiment of the invention relates to a high-voltage measurement technology, in particular to an error estimation method, device and equipment of a voltage transformer and a storage medium.
Background
The voltage transformer is a general device for converting high voltage into a small signal so as to realize measurement. The scale of application in electrical power systems is up to millions. In the long-term operation process, the voltage transformer is influenced by various physical fields such as electricity, magnetism, heat, force and the like, and the voltage measurement result can deviate.
At present, when a voltage transformer is checked, a power failure checking mode is generally adopted: and (3) powering off the voltage transformer to be detected and related circuits thereof, applying the same voltage signal to the voltage transformer to be detected and a standard device with higher accuracy, wherein the measured value of the standard device with higher accuracy is a relative true value, and the deviation between the measured value of the voltage transformer to be detected and the relative true value is the error of the transformer.
The power failure verification mode relies on a physical standard device with higher accuracy level, and the verification cost is higher. Meanwhile, depending on the power outage state, the power outage will require the line to be powered off, resulting in reduced line utilization.
Disclosure of Invention
The invention provides an error estimation method, device and equipment of a voltage transformer and a storage medium, which are used for realizing live detection of the voltage transformer, so that the verification cost of the voltage transformer is reduced, and the line utilization rate is improved.
In a first aspect, an embodiment of the present invention provides a method for estimating an error of a voltage transformer, including:
initializing a user-defined voltage true value;
determining an objective function according to the actual measured value of the voltage transformer and the self-defined voltage true value, wherein the objective function is used for representing the error of the measured value;
adjusting the self-defined voltage true value according to the error represented by the objective function to obtain the objective voltage true value;
and determining error data of the target voltage transformer according to the true value of the target voltage.
In a second aspect, an embodiment of the present invention further provides an error estimation apparatus for a voltage transformer, including:
the initialization module is used for initializing a user-defined voltage true value;
the objective function determining module is used for determining an objective function according to the actual measured value of the voltage transformer and the self-defined voltage true value, and the objective function is used for representing the error of the measured value;
the self-defined voltage true value adjusting module is used for adjusting the self-defined voltage true value according to the error represented by the objective function to obtain the objective voltage true value;
and the error data determining module is used for determining the error data of the target voltage transformer according to the true value of the target voltage.
In a third aspect, an embodiment of the present invention further provides a computer device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor, where the processor executes the program to implement the method for estimating an error of a voltage transformer according to the embodiment of the present invention.
In a fourth aspect, embodiments of the present invention also provide a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform a method for estimating an error of a voltage transformer as shown in the embodiments of the present invention.
The error estimation scheme of the voltage transformer provided by the embodiment of the invention can initialize the self-defined voltage true value; determining an objective function according to the actual measured value of the voltage transformer and the self-defined voltage true value, wherein the objective function is used for representing the error of the measured value; adjusting the self-defined voltage true value according to the error represented by the objective function to obtain the objective voltage true value; and determining error data of the target voltage transformer according to the true value of the target voltage. Compared with the problems of higher verification cost and low line utilization rate during power failure verification, the error estimation scheme of the voltage transformer provided by the invention can initialize the self-defined voltage true value, determine the objective function based on the initialized self-defined voltage true value and the actual measured value of the voltage transformer, adjust the self-defined voltage true value according to the error represented by the objective function, further obtain the objective voltage true value, and calculate the error of the objective voltage transformer according to the objective voltage positive value. The voltage transformer is not required to be powered off, and the actual measurement data of the voltage transformer is only required to be extracted, so that the self-defined voltage true value can be adjusted through the error of the objective function, and the adjusted target voltage true value is approximate to the actual voltage true value. And then the data of the target voltage transformer can be determined according to the true value of the target voltage. The above process does not resort to a physical etalon of a higher level of accuracy, thus enabling a reduction in verification costs; meanwhile, the voltage transformer does not need to be powered off, so that the smoothness of a circuit can be kept, and the utilization rate of the circuit is further improved.
Drawings
Fig. 1 is a flow chart of a method for estimating an error of a voltage transformer according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of an error estimation device of a voltage transformer in a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a computer device in a third embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Example 1
Fig. 1 is a flowchart of a method for estimating an error of a voltage transformer according to an embodiment of the present invention, where the method may be implemented by a computer device and specifically includes the following steps:
step 110, initializing a custom voltage true value.
The plurality of voltage transformers to be verified may be voltage transformers on the same side. The custom voltage true value in step 110 may represent the true voltage value of the voltage transformer. The user-defined voltage true value is adjusted through steps 120 to 130 to obtain the target voltage true value, so that the target voltage true value approaches to the real voltage value of the voltage transformer. Step 110 initializes the custom voltage value to provide an adjusted initialized custom voltage true value for the adjustments of steps 120-130. The customized voltage true value can be initialized by a random initialization mode.
The voltage transformer may be measured through a plurality of measurement cycles. Over time, the voltage truth values of the voltage transformers vary from time to time. For example, v can be used * Representing a sequence of custom voltage truth values including custom voltage truth values for each measurement period, v * ＝(v 1 ,v 2 ,…,v t ). Where t represents the number of measurement cycles. t may be greater than 1000 times, v i The voltage true value at the i-th time is indicated.
Assuming that the number of the voltage transformers to be detected is K, a sequence consisting of the true values of the self-defined voltages of each voltage transformer can be initialized to obtain v 1 ,v 2 ,…,v K . Wherein v is 1 Representing a customized voltage truth value of a first voltage transformerSequence, v 1 The method comprises a plurality of custom voltage true values of the first voltage transformer in t measurement periods.
Step 120, determining an objective function according to the actual measured value of the voltage transformer and the customized voltage true value, wherein the objective function is used for representing the error of the measured value.
The actual measured value of the voltage transformer is the voltage value measured by the voltage transformer in each measuring period. The objective function represents the error magnitude and/or the error ripple of the measured value. The smaller the objective function value is, the smaller the error is, and the self-defined voltage true value can be adjusted based on the minimum objective function value so as to obtain the self-defined voltage true value which minimizes the objective function value.
Alternatively, step 120 may be performed by:
step 121, determining an error sequence of each voltage transformer according to the actual measured value of the voltage transformer and the self-defined voltage true value, wherein the error sequence represents the error of the measured value of each measuring period relative to the self-defined voltage true value.
For any one voltage transformer i, the error can be determined according to the difference between the actual measured value of the voltage transformer and the true value of the self-defined voltage. The errors of the t measurement periods are combined into an error sequence. d, d i (i=1, 2,..k) represents the error sequence of the voltage transformer i.
d i ＝(v i,1 -v 1 ,v i,2 -v 2 ,…,v i,t -v t )。
Wherein v is i,1 Is d i Is the 1 st element of the voltage transformer, and represents the measured value, v, of the voltage transformer in the 1 st measuring period i,2 Is d i And (2) represents the measured value of the voltage transformer in the 2 nd measuring period, and so on, v i,t Is d i And (3) represents the measured value of the voltage transformer in the t-th measurement period.
Step 122, determining an error rate sequence of each voltage transformer according to the error sequence and the customized voltage true value, wherein the error rate sequence represents an error rate of the error of each measurement period relative to the customized voltage true value.
After determining the error sequence in step 121, the error rate may be determined based on the ratio of the error contained in the error sequence to the true value of the custom voltage. And dividing each element in the error sequence by the self-defined voltage true value of the measuring period of the element to obtain the error rate of each measuring period. The error rates for the multiple measurement periods constitute an error rate sequence.
Error rate sequence for voltage transformer iWherein->Representation d i The j-th element of (b).Representing the error value of the voltage transformer i in the 1 st measurement period and d i V of the 1 st element i,1 -v 1 . The error sequence is used to represent the error of the voltage transformer.
And 123, determining an error rate change sequence of each voltage transformer according to the error rate sequence of each voltage transformer, wherein the error rate change sequence represents the error rate change between two adjacent measurement periods.
The error rate is used to represent the error ripple of the voltage transformer. After determining the error rate sequence, subtracting the adjacent two error rates to obtain the error rate change condition of the adjacent two measurement periods.
Exemplary error rate variation sequence of voltage transformer i over t measurement cycles is Δe i 。
Wherein,representation e i The j-th element of (b). />Representing the measured value of the voltage transformer i in the 2 nd measuring period,/>Representing the measured value of the voltage transformer i at the 1 st measurement period. />Indicating a change in error rate for the first two measurement cycles.
Step 124, determining an objective function according to the error rate sequence and/or the error rate variation sequence.
The objective function may be determined based on the error rate sequence alone or based on the error rate change sequence alone. The objective function may also be determined from the error rate sequence and the error rate variation sequence. The objective function is determined in an error rate sequence and the custom voltage truth value may be adjusted based on the error. The target function is determined by the error rate variation sequence, and the self-defined voltage true value can be adjusted based on the fluctuation of the error. The target function is determined by the error rate sequence and the error rate variation sequence, and the custom voltage true value can be adjusted based on the error and the fluctuation.
Illustratively, summing according to the standard deviation of each error rate variation sequence to obtain a first function; summing according to error rate sequences of the voltage transformers in the measuring periods to obtain a second function; an objective function is determined from the first function and/or the second function.
Error rate variation sequence delta e based on each voltage transformer i Calculate the standard deviation std (Δe) i ). Summing the standard deviations of the K voltage transformers to obtain a first function,the first function is used to represent the error fluctuations.
Error rate sequence e for t measurement cycles of K voltage transformers i Performing the calculationAnd, a second function is obtained,the second function is used to represent the error.
In one implementation, the first function may be an objective function, or the second function may be an objective function.
In one implementation, determining the objective function from the first function and/or the second function may be implemented as: the sum function of the first function and the second function is taken as an objective function.
The sum of the first function and the second function may be taken as the objective function.
And 130, adjusting the true value of the self-defined voltage according to the error represented by the objective function to obtain the true value of the objective voltage.
Under the stable working state of the voltage transformer, when no remarkable physical damage exists, only a very small number of voltage transformers have the condition of error out of tolerance, so that the real value of the measurement voltage at the same side can be estimated by minimizing an objective function.
Taking the above formula as an example, the value of the true value of the user-defined voltage when the numerical value of the objective function is minimum is obtained, and the true value of the user-defined voltage is taken as the true value of the objective voltage.
Alternatively, step 130 may be performed in the following manner; determining a value range of a self-defined true value according to an actual measured value of the voltage transformer; and adjusting the true value of the self-defined voltage in the value range according to the error represented by the objective function to obtain the true value of the objective voltage.
When calculating the minimum value of the objective function, the function value of the objective function needs to be calculated by using the user-defined voltage true values with different values. When the value of the true value of the self-defined voltage is selected, if the limitation of the value range is absent, the calculated amount is huge.
The measurement true value v can be defined based on the measurement value of the current same-side voltage transformer * Lower value limit v of (2) l And an upper limit v u Wherein
v l ＝(min(v 1,1 ,v 2,1 ,…,v K,1 ),min(v 1,2 ,v 2,2 ,…,v K,2 ),…,min(v 1,t ,v 2,t ,…,v K，t ))
v u ＝(max(v 1，1 ，v 2，1 ，…，v K，1 )，max(v 1，2 ,v 2，2 ,…，v K，2 )，…,max(v 1,t ，v 2，t ，…，v K，t ))
The objective function calculation formula is:
wherein v is * ∈[v l ，v u ]。
Error sequence d i Error rate sequence e i The number of elements contained is the number of measuring periods, and the error rate change sequence deltae i The number of elements contained is the measurement period minus 1. With the increase of the measurement period, the increase of the independent variable dimension when the minimum value of the objective function is obtained increases the index level by calculated amount, and the calculated amount is huge. To address this issue, in one implementation, step 130 may be implemented as follows;
in the first stage, the initialized self-defined voltage true value is divided into a plurality of groups with the same length. And automatically adjusting each group by voltage true value according to the error represented by the objective function to obtain a group adjustment result.
The initialized custom voltage truth is also referred to as the initial population (v 1 ，v 2 ，v 3 ，…，v t )
Firstly, dividing initialized self-defined voltage true values into L groups with equal length according to the sequence, wherein each group has the length oft/L. Group 1 (also known as population 1) is (v 1 ，v 2 ，…，v t/L ) Group 2 (also known as population 2) is (v t/L+1 ，…，v 2t/L ) By this, group L (also called population L) (v t-L+1 ，…，v t ). Changing the dimension t in the objective function into the length t/L, respectively obtaining approximate optimal solutions of L groups based on the objective function of the changed dimension, and taking the approximate optimal solutions as group adjustment results.
And a second stage, determining a target voltage true value according to the group adjustment results and the error represented by the target function.
And a second stage, splicing the grouping adjustment results obtained in the first stage to obtain an initial solution set. Random stitching can be performed to obtain an initial solution set. Then, an optimal solution is obtained for the initial solution set through an objective function, and a unique optimal solution is output as a true value of the objective voltage.
And 140, determining error data of the target voltage transformer according to the true value of the target voltage.
Determining a target error rate sequence of the target voltage transformer according to the target voltage true value, wherein the target error rate sequence represents the error rate of the target voltage transformer in each measuring period; and determining steady-state errors of a plurality of periods according to the target error rate sequence, wherein the steady-state errors are used as error data of the target voltage transformer.
For the target voltage transformer i to be estimated, an error sequence d is calculated according to the following formula i
d i ＝(v i，1 -v′ 1 ，v i，2 -v′ 2 ，…,v i，t -v′ t )。
Wherein v' 1 、v′ 2 …v′ t Is the true value of the target voltage. The steady state error is estimated from the following equation by calculating the following equation:
the error estimation scheme of the voltage transformer provided by the embodiment of the invention can initialize the self-defined voltage true value; determining an objective function according to the actual measured value of the voltage transformer and the self-defined voltage true value, wherein the objective function is used for representing the error of the measured value; adjusting the self-defined voltage true value according to the error represented by the objective function to obtain the objective voltage true value; and determining error data of the target voltage transformer according to the true value of the target voltage. Compared with the problems of higher verification cost and low line utilization rate during power failure verification, the error estimation scheme of the voltage transformer provided by the invention can initialize the self-defined voltage true value, determine the objective function based on the initialized self-defined voltage true value and the actual measured value of the voltage transformer, adjust the self-defined voltage true value according to the error represented by the objective function, further obtain the objective voltage true value, and calculate the error of the objective voltage transformer according to the objective voltage positive value. The voltage transformer is not required to be powered off, and the actual measurement data of the voltage transformer is only required to be extracted, so that the self-defined voltage true value can be adjusted through the error of the objective function, and the adjusted target voltage true value is approximate to the actual voltage true value. And then the data of the target voltage transformer can be determined according to the true value of the target voltage. The above process does not resort to a physical etalon of a higher level of accuracy, thus enabling a reduction in verification costs; meanwhile, the voltage transformer does not need to be powered off, so that the smoothness of a circuit can be kept, and the utilization rate of the circuit is further improved.
Example two
Fig. 2 is a schematic structural diagram of an error estimation device for a voltage transformer according to a second embodiment of the present invention, where the embodiment is applicable to a case of measuring an error of a voltage transformer, and the device may be located in a computer device, and specifically includes: initialization module 210, objective function determination module 220, custom voltage truth adjustment module 230, and error data determination module 240.
An initialization module 210 for initializing a custom voltage truth value;
the objective function determining module 220 is configured to determine an objective function according to the actual measured value of the voltage transformer and the customized voltage true value, where the objective function is used to represent an error of the measured value;
the custom voltage truth value adjustment module 230 is configured to adjust the custom voltage truth value according to the error represented by the objective function, so as to obtain a target voltage truth value;
the error data determining module 240 is configured to determine error data of the target voltage transformer according to the target voltage truth value.
On the basis of the above embodiment, the objective function determining module 220 is configured to:
determining an error sequence of each voltage transformer according to the actual measured value of the voltage transformer and the self-defined voltage true value, wherein the error sequence represents the error of the measured value of each measuring period relative to the self-defined voltage true value;
determining an error rate sequence of each voltage transformer according to the error sequence and the self-defined voltage true value, wherein the error rate sequence represents the error rate of the error of each measuring period relative to the self-defined voltage true value;
determining an error rate change sequence of each voltage transformer according to the error rate sequence of each voltage transformer, wherein the error rate change sequence represents error rate change between two adjacent measurement periods;
an objective function is determined based on the error rate sequence and/or the error rate variation sequence.
On the basis of the above embodiment, the objective function determining module 220 is configured to:
summing according to the standard deviation of each error rate change sequence to obtain a first function;
summing according to error rate sequences of the voltage transformers in the measuring periods to obtain a second function;
an objective function is determined from the first function and/or the second function.
On the basis of the above embodiment, the objective function determining module 220 is configured to:
the sum function of the first function and the second function is taken as an objective function.
Based on the above embodiments, the custom voltage truth adjustment module 230 is configured to:
determining a value range of a self-defined true value according to an actual measured value of the voltage transformer;
and adjusting the true value of the self-defined voltage in the value range according to the error represented by the objective function to obtain the true value of the objective voltage.
Based on the above embodiments, the custom voltage truth adjustment module 230 is configured to:
dividing the initialized self-defined voltage true value into a plurality of groups with the same length;
automatically adjusting each group by voltage true value according to the error represented by the objective function to obtain a group adjustment result;
and determining a target voltage true value according to the plurality of grouping adjustment results and the error represented by the target function.
On the basis of the above embodiment, the error data determining module 240 is configured to:
determining a target error rate sequence of the target voltage transformer according to the target voltage true value, wherein the target error rate sequence represents the error rate of the target voltage transformer in each measuring period;
and determining steady-state errors of a plurality of periods according to the target error rate sequence, wherein the steady-state errors are used as error data of the target voltage transformer.
According to the error estimation scheme of the voltage transformer provided by the embodiment of the invention, the initialization module 210 initializes a user-defined voltage true value; the objective function determining module 220 determines an objective function according to the actual measured value of the voltage transformer and the customized voltage true value, wherein the objective function is used for representing the error of the measured value; the custom voltage truth value adjusting module 230 adjusts the custom voltage truth value according to the error represented by the objective function to obtain the objective voltage truth value; the error data determination module 240 determines error data for the target voltage transformer based on the target voltage truth. Compared with the problems of higher verification cost and low line utilization rate during power failure verification, the error estimation scheme of the voltage transformer provided by the invention can initialize the self-defined voltage true value, determine the objective function based on the initialized self-defined voltage true value and the actual measured value of the voltage transformer, adjust the self-defined voltage true value according to the error represented by the objective function, further obtain the objective voltage true value, and calculate the error of the objective voltage transformer according to the objective voltage positive value. The voltage transformer is not required to be powered off, and the actual measurement data of the voltage transformer is only required to be extracted, so that the self-defined voltage true value can be adjusted through the error of the objective function, and the adjusted target voltage true value is approximate to the actual voltage true value. And then the data of the target voltage transformer can be determined according to the true value of the target voltage. The above process does not resort to a physical etalon of a higher level of accuracy, thus enabling a reduction in verification costs; meanwhile, the voltage transformer does not need to be powered off, so that the smoothness of a circuit can be kept, and the utilization rate of the circuit is further improved.
The error estimation device of the voltage transformer provided by the embodiment of the invention can execute the error estimation method of the voltage transformer provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
Example III
Fig. 3 is a schematic structural diagram of a computer device according to a third embodiment of the present invention, and as shown in fig. 3, the computer device includes a processor 30, a memory 31, an input device 32 and an output device 33; the number of processors 30 in the computer device may be one or more, one processor 30 being taken as an example in fig. 3; the processor 30, the memory 31, the input means 32 and the output means 33 in the computer device may be connected by a bus or by other means, in fig. 3 by way of example.
The memory 31 is a computer readable storage medium, and may be used to store a software program, a computer executable program, and modules, such as program instructions/modules (e.g., an initialization module 210, an objective function determination module 220, a custom voltage truth adjustment module 230, and an error data determination module 240) corresponding to the error estimation method of the voltage transformer in the embodiment of the present invention. The processor 30 executes various functional applications of the computer device and data processing, namely, implements the error estimation method of the voltage transformer described above by running software programs, instructions and modules stored in the memory 31.
The memory 31 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for functions; the storage data area may store data created according to the use of the terminal, etc. In addition, the memory 31 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some examples, memory 31 may further comprise memory remotely located relative to processor 30, which may be connected to the computer device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 32 is operable to receive input numeric or character information and to generate key signal inputs related to user settings and function control of the computer device. The output means 33 may comprise a display device such as a display screen.
Example IV
A fourth embodiment of the present invention also provides a storage medium containing computer-executable instructions, which when executed by a computer processor, are for performing a method of error estimation of a voltage transformer, the method comprising:
initializing a user-defined voltage true value;
determining an objective function according to the actual measured value of the voltage transformer and the self-defined voltage true value, wherein the objective function is used for representing the error of the measured value;
adjusting the self-defined voltage true value according to the error represented by the objective function to obtain the objective voltage true value;
and determining error data of the target voltage transformer according to the true value of the target voltage.
On the basis of the above embodiment, determining the objective function according to the actual measured value of the voltage transformer and the customized voltage true value includes:
determining an error sequence of each voltage transformer according to the actual measured value of the voltage transformer and the self-defined voltage true value, wherein the error sequence represents the error of the measured value of each measuring period relative to the self-defined voltage true value;
determining an error rate sequence of each voltage transformer according to the error sequence and the self-defined voltage true value, wherein the error rate sequence represents the error rate of the error of each measuring period relative to the self-defined voltage true value;
determining an error rate change sequence of each voltage transformer according to the error rate sequence of each voltage transformer, wherein the error rate change sequence represents error rate change between two adjacent measurement periods;
an objective function is determined based on the error rate sequence and/or the error rate variation sequence.
On the basis of the above embodiment, determining the objective function according to the error rate sequence and/or the error rate variation sequence includes:
summing according to the standard deviation of each error rate change sequence to obtain a first function;
summing according to error rate sequences of the voltage transformers in the measuring periods to obtain a second function;
an objective function is determined from the first function and/or the second function.
On the basis of the above embodiment, determining the objective function according to the first function and/or the second function includes:
the sum function of the first function and the second function is taken as an objective function.
On the basis of the above embodiment, the adjusting the true value of the custom voltage according to the error represented by the objective function to obtain the true value of the objective voltage includes:
determining a value range of a self-defined true value according to an actual measured value of the voltage transformer;
and adjusting the true value of the self-defined voltage in the value range according to the error represented by the objective function to obtain the true value of the objective voltage.
On the basis of the above embodiment, the adjusting the true value of the custom voltage according to the error represented by the objective function to obtain the true value of the objective voltage includes:
dividing the initialized self-defined voltage true value into a plurality of groups with the same length;
automatically adjusting each group by voltage true value according to the error represented by the objective function to obtain a group adjustment result;
and determining a target voltage true value according to the plurality of grouping adjustment results and the error represented by the target function.
On the basis of the above embodiment, determining the error data of the target voltage transformer according to the target voltage truth value includes:
determining a target error rate sequence of the target voltage transformer according to the target voltage true value, wherein the target error rate sequence represents the error rate of the target voltage transformer in each measuring period;
and determining steady-state errors of a plurality of periods according to the target error rate sequence, wherein the steady-state errors are used as error data of the target voltage transformer. Of course, the storage medium containing the computer executable instructions provided in the embodiments of the present invention is not limited to the above method operations, and may also perform the related operations in the error estimation method of the voltage transformer provided in any embodiment of the present invention.
From the above description of embodiments, it will be clear to a person skilled in the art that the present invention may be implemented by means of software and necessary general purpose hardware, but of course also by means of hardware, although in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, etc., and include several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments of the present invention.
It should be noted that, in the embodiment of the error estimation device of the voltage transformer, each unit and module included are only divided according to the functional logic, but are not limited to the above-mentioned division, so long as the corresponding functions can be implemented; in addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present invention.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (9)
1. A method for estimating an error of a voltage transformer, comprising:
initializing a user-defined voltage true value;
determining an objective function according to the actual measured value of the voltage transformer and the self-defined voltage true value, wherein the objective function is used for representing the error of the measured value;
adjusting the self-defined voltage true value according to the error represented by the objective function to obtain a target voltage true value;
determining error data of a target voltage transformer according to the target voltage true value;
the step of adjusting the self-defined voltage true value according to the error represented by the objective function to obtain the objective voltage true value comprises the following steps:
determining a value range of a self-defined true value according to an actual measured value of the voltage transformer;
and adjusting the self-defined voltage true value in the value range according to the error represented by the objective function to obtain a target voltage true value.
2. The method of claim 1, wherein said determining an objective function based on actual measurements of the voltage transformer and said customized voltage truth value comprises:
determining an error sequence of each voltage transformer according to the actual measured value of the voltage transformer and the self-defined voltage true value, wherein the error sequence represents the error of the measured value of each measuring period relative to the self-defined voltage true value;
determining an error rate sequence of each voltage transformer according to the error sequence and the self-defined voltage true value, wherein the error rate sequence represents an error rate of errors of each measurement period relative to the self-defined voltage true value;
determining an error rate change sequence of each voltage transformer according to the error rate sequence of each voltage transformer, wherein the error rate change sequence represents error rate change between two adjacent measurement periods;
an objective function is determined from the error rate sequence and/or the error rate variation sequence.
3. The method according to claim 2, wherein said determining an objective function from said sequence of error rates and/or said sequence of error rate variations comprises:
summing according to the standard deviation of each error rate change sequence to obtain a first function;
summing according to error rate sequences of the voltage transformers in the measuring periods to obtain a second function;
an objective function is determined from the first function and/or the second function.
4. A method according to claim 3, wherein determining an objective function from the first function and/or the second function comprises:
and taking a summation function of the first function and the second function as an objective function.
5. The method of claim 1, wherein the adjusting the custom voltage truth value according to the error represented by the objective function to obtain the objective voltage truth value comprises:
dividing the initialized self-defined voltage true value into a plurality of groups with the same length;
automatically adjusting each group by voltage true value according to the error represented by the objective function to obtain a group adjustment result;
and determining a target voltage true value according to a plurality of grouping adjustment results and errors represented by the target function.
6. The method of claim 1, wherein said determining error data for a target voltage transformer based on said target voltage truth value comprises:
determining a target error rate sequence of the target voltage transformer according to the target voltage true value, wherein the target error rate sequence represents the error rate of the target voltage transformer in each measuring period;
and determining steady-state errors of a plurality of periods according to the target error rate sequence, wherein the steady-state errors are used as error data of a target voltage transformer.
7. An error estimation device for a voltage transformer, comprising:
the initialization module is used for initializing a user-defined voltage true value;
the objective function determining module is used for determining an objective function according to the actual measured value of the voltage transformer and the self-defined voltage true value, and the objective function is used for representing the error of the measured value;
the self-defined voltage true value adjusting module is used for adjusting the self-defined voltage true value according to the error represented by the objective function to obtain a target voltage true value;
the error data determining module is used for determining error data of the target voltage transformer according to the target voltage true value;
the self-defined voltage truth value adjusting module is also used for determining the value range of the self-defined truth value according to the actual measured value of the voltage transformer; and adjusting the true value of the self-defined voltage in the value range according to the error represented by the objective function to obtain the true value of the objective voltage.
8. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method of error estimation of a voltage transformer according to any of claims 1-6 when executing the program.
9. A storage medium containing computer executable instructions which, when executed by a computer processor, are for performing the method of error estimation of a voltage transformer as claimed in any one of claims 1 to 6.
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