CN112816754B - Current compensation method and equipment for current transformer - Google Patents
Current compensation method and equipment for current transformer Download PDFInfo
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- CN112816754B CN112816754B CN202011527954.XA CN202011527954A CN112816754B CN 112816754 B CN112816754 B CN 112816754B CN 202011527954 A CN202011527954 A CN 202011527954A CN 112816754 B CN112816754 B CN 112816754B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to a current transformer current compensation method and equipment, which are used for detecting a primary current amplitude of a current transformer, and then processing the primary current amplitude and a transformation ratio by adopting a preset current compensation model to obtain a secondary current amplitude of the current transformer in a real theory.
Description
Technical Field
The invention relates to the technical field of radio frequency identification, in particular to a current compensation method and current compensation equipment for a current transformer.
Background
The current transformers can be divided into two categories, namely current transformers for measurement and current transformers for protection, wherein the current transformers for measurement are mainly used for charging electric energy and monitoring and controlling in a normal operation state of an electric power system, and the current transformers are measuring equipment which is most widely used by the electric power system and are also important electrical equipment of a power plant and a power transformation and distribution substation.
The measurement accuracy of the current transformer is easily influenced by the current of the main loop, so that an error exists between the actual secondary current amplitude and the theoretical secondary current amplitude, and when the detection equipment is selected to actually measure the secondary current amplitude, the measuring range is easily over-range, so that the detection equipment is damaged.
Disclosure of Invention
Based on this, it is necessary to provide a current transformer current compensation method and apparatus capable of obtaining a true theoretical secondary current amplitude.
A current transformer current compensation method, comprising:
detecting a primary current amplitude of the current transformer;
obtaining the transformation ratio of the current transformer;
and processing the primary current amplitude and the transformation ratio by adopting a preset current compensation model to obtain a secondary current amplitude of the current transformer.
In one embodiment, the processing the primary current amplitude and the transformation ratio by using a preset current compensation model to obtain a secondary current amplitude of the current transformer includes:
obtaining a ratio difference value according to the primary current amplitude value based on the mapping relation between the primary current amplitude value and the ratio difference in the preset current compensation model;
and processing the primary current amplitude, the transformation ratio and the ratio difference value by adopting the preset current compensation model to obtain the secondary current amplitude.
In one embodiment, the current transformer current compensation method further includes:
detecting a primary current phase angle of the current transformer;
and processing the primary current amplitude and the primary current phase angle by adopting the preset current compensation model to obtain a secondary current phase angle of the current transformer.
In one embodiment, the processing the primary current amplitude and the primary current phase angle by using the preset current compensation model to obtain a secondary current phase angle of the current transformer includes:
based on the mapping relation between the primary current amplitude and the angular difference in the preset current compensation model, obtaining an angular difference value according to the primary current amplitude;
and processing the primary current phase angle and the angle difference value by adopting the preset current compensation model to obtain the secondary current phase angle.
In one embodiment, before the processing the primary current amplitude and the transformation ratio by using the preset current compensation model and the processing the primary current amplitude and the primary current phase angle by using the preset current compensation model, the current transformer current compensation method further includes:
detecting frequency information of primary current of the current transformer;
and acquiring the preset current compensation model from the model set according to the frequency information.
In one embodiment, the current transformer current compensation method further includes:
acquiring a plurality of groups of sample frequency information, sample primary current phase angles, sample secondary current amplitudes and sample secondary current phase angles which respectively correspond to the primary current amplitudes of the samples;
generating a model set according to each set of the sample frequency information, the sample primary current amplitude, the sample primary current phase angle, the sample secondary current amplitude, the sample secondary current phase angle, and the transformation ratio, wherein the model set comprises a plurality of preset current compensation models corresponding to each set of the sample frequency information.
In one embodiment, the generating a model set according to each set of the sample frequency information, the sample primary current amplitude, the sample primary current phase angle, the sample secondary current amplitude, the sample secondary current phase angle, and the transformation ratio comprises:
obtaining a difference value of each sample ratio according to each group of the sample primary current amplitude, the sample secondary current amplitude and the transformation ratio;
obtaining each sample angle difference value according to each group of the sample primary current phase angle and the sample secondary current phase angle;
generating a plurality of preset current compensation models according to the sample ratio difference values and the sample angle difference values;
and generating the model set according to the sample frequency information and the preset current compensation models.
In one embodiment, the current transformer current compensation method further includes:
acquiring a secondary current detection value of the current transformer;
and correcting the current transformer according to the secondary current detection value.
A current transformer current compensation device comprising:
the detection module is used for detecting the primary current amplitude of the current transformer;
the acquisition module is used for acquiring the transformation ratio of the current transformer;
and the processor is used for processing the primary current amplitude and the transformation ratio by adopting a preset current compensation model to obtain a secondary current amplitude of the current transformer.
A current transformer current compensation device comprising a memory storing a computer program and a processor implementing the steps of any of the above methods when the computer program is executed.
According to the current transformer current compensation method and device, the primary current amplitude of the current transformer is detected, then the primary current amplitude and the transformation ratio are processed by adopting the preset current compensation model to obtain the secondary current amplitude of the current transformer in a real theory, the secondary current amplitude is an empirical value obtained by learning historical data, and the influence of the primary current amplitude is considered and is closer to the real secondary current amplitude, so that the detection device is not easy to damage by range selection of the detection device according to the value.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a current compensation method of a current transformer according to an embodiment;
fig. 2 is a schematic flow chart of a current compensation method of a current transformer according to another embodiment;
fig. 3 is a schematic flowchart of a current compensation method of a current transformer according to another embodiment;
FIG. 4 is a schematic flow chart illustrating a current compensation method of a current transformer according to another embodiment;
FIG. 5 is a schematic flow chart illustrating a current compensation method of a current transformer according to another embodiment;
FIG. 6 is a schematic flow chart illustrating a current compensation method of a current transformer according to another embodiment;
fig. 7 is a schematic flowchart of a current compensation method of a current transformer according to another embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. The first resistance and the second resistance are both resistances, but they are not the same resistance.
It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
Fig. 1 is a schematic flowchart of a current compensation method of a current transformer according to an embodiment, where the method includes steps S110 to S130.
And step S110, detecting the primary current amplitude of the current transformer.
It can be understood that the primary current amplitude of the current transformer is the input current amplitude of the current transformer.
And step S120, obtaining the transformation ratio of the current transformer.
The transformation ratio of the current transformer can be obtained according to the product model of the current transformer.
And step S130, processing the primary current amplitude and the transformation ratio by adopting a preset current compensation model to obtain a secondary current amplitude of the current transformer.
The preset current compensation model may store a mapping relationship between the primary current amplitude and the transformation ratio and the secondary current amplitude, for example, the mapping relationship may be stored in the preset current compensation model in the form of a function, a correspondence table, or a fitting curve, and based on the preset current compensation model, the secondary current amplitude of the current transformer may be obtained according to the measured primary current amplitude and the transformation ratio.
It can be understood that the current transformer is generally used for reducing the input current, then the output end of the current transformer can be connected with the detection device to detect the output current of the current transformer, because the transformation ratio of the current transformer is known, the secondary current amplitude can be calculated according to the input current when the detection device is used for detection, and then the range of the detection device is selected, when the deviation of the input current and the rated working current is large, the precision of the current transformer is affected, the secondary current amplitude obtained by calculating according to the parameters of the current transformer under the rated working current can have an error with the true value, if the range of the detection device is still selected according to the calculated secondary current amplitude, the range of the range is possibly too large or too small, and the situation that the measurement is inaccurate or the range is exceeded, and the detection device is damaged is caused. In the embodiment, the influence of the primary current amplitude on the current transformer is considered, the secondary current amplitude can be obtained by using the preset current compensation model, is an empirical value obtained by learning historical data and is closer to a true value, so that the detection equipment is not easily damaged by selecting the range of the detection equipment according to the value, and the detected value is more accurate because the selected range is more fit with the numerical range of the true value.
According to the embodiment of the invention, the primary current amplitude of the current transformer is detected, and then the primary current amplitude and the transformation ratio are processed by adopting the preset current compensation model to obtain the secondary current amplitude of the current transformer in a real theory, wherein the secondary current amplitude is an empirical value obtained by learning historical data, and is closer to the real secondary current amplitude due to the consideration of the influence of the primary current amplitude, so that the detection equipment is not easy to damage by selecting the range of the detection equipment according to the value, and the detected value is more accurate due to the fact that the selected range is more fit with the numerical range of the real value.
Fig. 2 is a schematic flow chart of a current transformer current compensation method according to another embodiment, and compared with the embodiment of fig. 1, the present embodiment includes steps S131 to S132 of processing a primary current amplitude and a transformation ratio by using a preset current compensation model to obtain a secondary current amplitude of the current transformer.
Step S131, obtaining a ratio difference value according to the primary current amplitude value based on the mapping relation between the primary current amplitude value and the ratio difference in the preset current compensation model.
It can be understood that the primary current amplitude can influence the secondary current amplitude output by the current transformer, the preset current compensation model stores the mapping relation between the ratio difference of the current transformer and the primary current amplitude, and specifically can be in the form of a function, a correspondence table, a fitting curve and the like, and based on the mapping relation, the ratio difference value of the current transformer can be obtained according to the primary current amplitude.
And step S132, processing the primary current amplitude, the transformation ratio and the ratio difference value by adopting a preset current compensation model to obtain a secondary current amplitude.
It can be understood that the obtained specific difference is an error value influenced by the primary current amplitude, the preset current compensation model can store the mapping relation between the primary current amplitude, the transformation ratio and the specific difference and the secondary current amplitude, and the secondary current amplitude can be obtained according to the known primary current amplitude, the transformation ratio and the specific difference. In one embodiment, the mapping relationship may be a function formula, specifically, the mapping relationship may be a primary current amplitude multiplied by a sum of a ratio difference and the primary current amplitude, and then a quotient is obtained for the transformation ratio, and finally, a true theoretical secondary current amplitude may be obtained according to the function formula.
The embodiment of the invention is based on the mapping relation between the primary current amplitude and the ratio difference in the preset current compensation model, obtains the ratio difference value according to the primary current amplitude, and further adopts the preset current compensation model to process the primary current amplitude, the ratio difference value and the transformation ratio to obtain the secondary current amplitude.
Fig. 3 is a schematic flow chart of a current transformer current compensation method according to another embodiment, and the present embodiment is different from the embodiment of fig. 1 only in that the current transformer current compensation method further includes steps S310 to S320.
Step S310, detecting a primary current phase angle of the current transformer.
Wherein, the primary current phase angle can be measured by adopting a current vector acquisition device.
And step S320, processing the primary current amplitude and the primary current phase angle by adopting a preset current compensation model to obtain a secondary current phase angle of the current transformer.
It can be understood that the preset current compensation model may store a mapping relationship between the primary current amplitude and the primary current phase angle and the secondary current phase angle, for example, the mapping relationship may be stored in the preset current compensation model in the form of a function, a correspondence table, or a fitting curve, and based on the preset current compensation model, the secondary current phase angle of the current transformer may be obtained according to the measured primary current amplitude and the measured primary current phase angle.
It can be understood that, in general, the phase difference between the ideal secondary current and the primary current of the current transformer is 180 °, and when the primary current amplitude deviates from the rated current value of the current transformer, the secondary current phase angle has an error, so that the primary current phase angle and the primary current amplitude can be processed by using a preset current compensation model, and the secondary current phase angle of the current transformer can be directly obtained quickly and accurately. In one embodiment, after the secondary current phase angle is obtained by using the preset current compensation model, it may be further determined whether a difference between the primary current phase angle and the secondary current phase angle exceeds a threshold, and if the difference exceeds the threshold, the current transformer may be adjusted to counteract an influence of the primary current amplitude.
According to the embodiment of the invention, the primary current phase angle of the current transformer is detected, and the primary current phase angle and the primary current amplitude are processed by adopting the preset current compensation model to obtain the secondary current phase angle of the current transformer, so that the method is rapid and accurate. And after the secondary current phase angle is obtained by using the preset current compensation model, whether the difference between the primary current phase angle and the secondary current phase angle exceeds a threshold value or not can be judged, and if the difference exceeds the threshold value, the current transformer can be adjusted to counteract the influence of the primary current amplitude.
Fig. 4 is a schematic flow chart of a current compensation method of a current transformer according to another embodiment, which is different from the embodiment of fig. 3 only in that the step of processing the primary current amplitude and the primary current phase angle by using a preset current compensation model to obtain the secondary current phase angle of the current transformer includes steps S321 to S322.
Step S321, based on the mapping relationship between the primary current amplitude and the angular difference in the preset current compensation model, obtaining the angular difference according to the primary current amplitude.
It can be understood that the primary current amplitude affects the secondary current phase angle of the current transformer, the preset current compensation model stores the mapping relationship between the angular difference of the current transformer and the primary current amplitude, and specifically, the preset current compensation model can be in the form of a function, a correspondence table, a fitting curve and the like, and based on the mapping relationship, the angular difference value of the current transformer can be obtained according to the primary current amplitude.
Step S322, processing the primary current phase angle and the angle difference value by using a preset current compensation model to obtain a secondary current phase angle.
It can be understood that the obtained angular difference value is an error value influenced by the primary current amplitude, the preset current compensation model may store a mapping relationship between the primary current phase angle and the angular difference value and the secondary current phase angle, and the secondary current phase angle may be obtained according to the known primary current phase angle and the angular difference value. In one embodiment, the mapping relationship may be a functional formula, specifically, the mapping relationship may be a sum of the primary current phase angle and the angular difference value and the 180 ° angle, and a real theoretical secondary current phase angle may be finally obtained according to the functional formula.
According to the embodiment of the invention, based on the mapping relation between the primary current amplitude and the angular difference in the preset current compensation model, the angular difference value is obtained according to the primary current amplitude, and then the preset current compensation model is adopted to process the primary current phase angle and the angular difference value to obtain the secondary current phase angle, so that the real theoretical secondary current phase angle is obtained.
Fig. 5 is a schematic flow chart of a current transformer current compensation method according to another embodiment, which differs from the embodiment of fig. 3 only in that the current transformer current compensation method further includes steps S510 to S520 before the primary current amplitude and the transformation ratio are processed by using the preset current compensation model and the primary current amplitude and the primary current phase angle are processed by using the preset current compensation model.
Step S510, detecting frequency information of the primary current of the current transformer.
It can be understood that, for the same current transformer, when the frequencies of the primary currents are different, the amplitude and the phase angle of the actually output secondary current may also deviate from the amplitude and the phase angle of the theoretically output secondary current.
Step S520, acquiring a preset current compensation model from the model set according to the frequency information.
The model is centrally stored with a plurality of preset current compensation models, and the frequency of the primary current influences the amplitude and the phase angle of the secondary current, so that the ratio difference and the angle difference are different when the primary current is different, and the corresponding preset current compensation models can be selected from the model set according to the frequency information of the primary current, so that the accuracy of the obtained amplitude and the phase angle of the secondary current is higher.
Fig. 6 is a schematic flowchart of a current transformer current compensation method according to an embodiment, where the current transformer current compensation method further includes steps S610 to S620, as shown in fig. 6.
Step S610, acquiring a plurality of groups of sample frequency information, sample primary current phase angles, sample secondary current amplitudes and sample secondary current phase angles which respectively correspond to the primary current amplitudes of the samples;
step S620, generating a model set according to each group of sample frequency information, sample primary current amplitude, sample primary current phase angle, sample secondary current amplitude, sample secondary current phase angle and transformation ratio, wherein the model set comprises a plurality of preset current compensation models corresponding to each group of sample frequency information.
It can be understood that before the preset current compensation model is obtained from the model set according to the frequency information, the model set needs to be established according to sample data. Specifically, each group of sample values under the same sample frequency information can be firstly put into one data set, then each sample value is modeled by taking the sample primary current amplitude as a variable, so that a preset current compensation model corresponding to the sample primary current amplitude is obtained, then the operation is repeated, finally a plurality of preset current compensation models corresponding to the input frequency information of each sample are obtained, and one model set is generated. The preset current compensation model stores a mapping relation between a primary current amplitude and a transformation ratio and a secondary current amplitude, and also stores a primary current phase angle and a mapping relation between the primary current amplitude and the secondary current phase angle.
Fig. 7 is a schematic flow chart of a current transformer current compensation method according to another embodiment, which differs from the embodiment of fig. 6 only in that a model set is generated according to each set of sample frequency information, sample primary current amplitude, sample primary current phase angle, sample secondary current amplitude, sample secondary current phase angle, and transformation ratio, and includes steps S621 to S624.
And step S621, obtaining a difference value of each sample ratio according to the primary current amplitude of each group of samples, the secondary current amplitude of each group of samples and the transformation ratio.
Wherein the sample ratio difference is equal to the product of the sample secondary current amplitude and the transformation ratio minus the sample primary current amplitude, then divided by the sample primary current amplitude.
In step S622, each sample angle difference is obtained according to each group of sample primary current phase angles and sample secondary current phase angles.
Wherein the sample angle difference is equal to the phase difference between the sample secondary current phase angle minus 180 ° and the primary current phase angle.
Step S623, generating a plurality of preset current compensation models according to the sample ratio difference values and the sample angle difference values.
It can be understood that each sample ratio difference value and each sample angle difference value respectively correspond to a primary current amplitude value one to one, and a plurality of preset current compensation models can be generated according to each sample ratio difference value and each sample angle difference value by taking the primary current amplitude value as a variable.
Step S624, generating a model set according to the sample frequency information and the preset current compensation models.
It can be understood that, since the frequency of the primary current may affect the amplitude of the secondary current and the phase angle of the secondary current, and thus the frequency of the primary current is different, the ratio difference value and the angle difference value are also different, a model set may be generated according to the correspondence between the frequency of the primary current and each preset current compensation model.
In one embodiment, the current transformer current compensation method further includes obtaining a secondary current detection value of the current transformer, and then correcting the current transformer according to the secondary current detection value.
It can be understood that after the secondary current amplitude of the current transformer is obtained, detection equipment with a proper measuring range can be selected to detect the current transformer, so that an accurate secondary current detection value is obtained, and the current transformer can be corrected. Specifically, the secondary current detection value can be compared with a theoretical secondary current amplitude value obtained by calculation according to the transformation ratio of the current transformer, and if the error is too large, the current transformer can be corrected.
It should be understood that although the various steps in the flow charts of fig. 1-7 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1-7 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least some of the other steps.
The invention also provides current compensation equipment for the current transformer, which comprises a detection module, an acquisition module and a processor, wherein the detection module is used for detecting the primary current amplitude of the current transformer; the acquisition module is used for acquiring the transformation ratio of the current transformer; the processor is used for processing the primary current amplitude by adopting a preset current compensation model to obtain a secondary current amplitude of the current transformer.
In one embodiment, the processor is further configured to obtain a ratio difference value according to the primary current amplitude based on a mapping relationship between the primary current amplitude and the ratio difference in the preset current compensation model, and then process the primary current amplitude, the transformation ratio and the ratio difference value by using the preset current compensation model to obtain the secondary current amplitude.
In one embodiment, the detection module is further configured to detect a primary current phase angle of the current transformer, and the processor is further configured to process the primary current amplitude and the primary current phase angle using a preset current compensation model to obtain a secondary current phase angle of the current transformer.
In one embodiment, the processor is further configured to obtain an angle difference value according to the primary current amplitude value based on a mapping relationship between the primary current amplitude value and the angle difference in a preset current compensation model, and then process the primary current phase angle and the angle difference value by using the preset current compensation model to obtain a secondary current phase angle.
In one embodiment, the detection module is further configured to detect frequency information of the primary current of the current transformer, and the processor is further configured to obtain a preset current compensation model from the model set according to the frequency information.
In one embodiment, the obtaining module is further configured to obtain a plurality of sets of sample frequency information, a sample primary current phase angle, a sample secondary current amplitude, and a sample secondary current phase angle, which respectively correspond to each sample primary current amplitude, and the processor is further configured to generate a model set according to each set of sample frequency information, each set of sample primary current amplitude, each set of sample primary current phase angle, each set of sample secondary current amplitude, each set of sample secondary current phase angle, and each set of transformation ratio, where the model set includes a plurality of preset current compensation models corresponding to each set of sample frequency information.
In one embodiment, the processor is further configured to obtain each sample ratio difference according to each group of sample primary current amplitudes, each sample secondary current amplitude, and the transformation ratio, obtain each sample angle difference according to each group of sample primary current phase angles and each sample secondary current phase angle, generate a plurality of preset current compensation models according to each sample ratio difference and each sample angle difference, and finally generate a model set according to each sample frequency information and each preset current compensation model.
In one embodiment, the obtaining module is further configured to obtain a secondary current detection value of the current transformer, and the current transformer current compensation device further includes a correcting module configured to correct the current transformer according to the secondary current detection value.
The present invention further provides a current transformer current compensation device, which includes a memory and a processor, where the memory stores a computer program, and is characterized in that the processor implements the steps of the method in any of the above embodiments when executing the computer program.
Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the method of any of the above embodiments.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic depictions of the above terms do not necessarily refer to the same embodiment or example.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A current compensation method for a current transformer is characterized by comprising the following steps:
detecting a primary current amplitude of the current transformer;
obtaining the transformation ratio of the current transformer;
processing the primary current amplitude and the transformation ratio by adopting a preset current compensation model to obtain a secondary current amplitude of the current transformer;
acquiring a plurality of groups of sample frequency information, sample primary current phase angles, sample secondary current amplitudes and sample secondary current phase angles which respectively correspond to the primary current amplitudes of the samples;
generating a model set according to each set of the sample frequency information, the sample primary current amplitude, the sample primary current phase angle, the sample secondary current amplitude, the sample secondary current phase angle, and the transformation ratio, wherein the model set comprises a plurality of preset current compensation models corresponding to each set of the sample frequency information.
2. The current transformer current compensation method of claim 1, wherein the processing the primary current amplitude and the transformation ratio by using a preset current compensation model to obtain the secondary current amplitude of the current transformer comprises:
obtaining a ratio difference value according to the primary current amplitude value based on the mapping relation between the primary current amplitude value and the ratio difference in the preset current compensation model;
and processing the primary current amplitude, the transformation ratio and the ratio difference value by adopting the preset current compensation model to obtain the secondary current amplitude.
3. The current transformer current compensation method of claim 1, further comprising:
detecting a primary current phase angle of the current transformer;
and processing the primary current amplitude and the primary current phase angle by adopting the preset current compensation model to obtain a secondary current phase angle of the current transformer.
4. The current transformer current compensation method of claim 3, wherein the processing the primary current amplitude and the primary current phase angle using the preset current compensation model to obtain the secondary current phase angle of the current transformer comprises:
based on the mapping relation between the primary current amplitude and the angular difference in the preset current compensation model, obtaining an angular difference value according to the primary current amplitude;
and processing the primary current phase angle and the angle difference value by adopting the preset current compensation model to obtain the secondary current phase angle.
5. The current transformer current compensation method of claim 3, wherein before processing the primary current amplitude and the transformation ratio using a preset current compensation model and processing the primary current amplitude and the primary current phase angle using the preset current compensation model, the current transformer current compensation method further comprises:
detecting frequency information of primary current of the current transformer;
and acquiring the preset current compensation model from the model set according to the frequency information.
6. The current transformer current compensation method of claim 1, wherein generating a model set based on the respective sets of the sample frequency information, sample primary current amplitude, sample primary current phase angle, sample secondary current amplitude, sample secondary current phase angle, and the transformation ratio comprises:
obtaining a difference value of each sample ratio according to each group of the sample primary current amplitude, the sample secondary current amplitude and the transformation ratio;
obtaining each sample angle difference value according to each group of the sample primary current phase angle and the sample secondary current phase angle;
generating a plurality of preset current compensation models according to the sample ratio difference values and the sample angle difference values;
and generating the model set according to the sample frequency information and the preset current compensation models.
7. The current transformer current compensation method of claim 3, further comprising:
acquiring a secondary current detection value of the current transformer;
and correcting the current transformer according to the secondary current detection value.
8. A current transformer current compensation device, comprising:
the detection module is used for detecting the primary current amplitude of the current transformer;
the acquisition module is used for acquiring the transformation ratio of the current transformer;
the processor is used for processing the primary current amplitude and the transformation ratio by adopting a preset current compensation model to obtain a secondary current amplitude of the current transformer;
the acquisition module is also used for acquiring a plurality of groups of sample frequency information, sample primary current phase angles, sample secondary current amplitude values and sample secondary current phase angles which respectively correspond to the primary current amplitude values of the samples;
the processor is further configured to generate a model set from each set of the sample frequency information, the sample primary current amplitude, the sample primary current phase angle, the sample secondary current amplitude, the sample secondary current phase angle, and the transformation ratio, the model set including a plurality of the preset current compensation models corresponding to each of the sample frequency information.
9. A current transformer current compensation device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any one of claims 1 to 7.
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| KR100580428B1 (en) * | 2004-10-11 | 2006-05-15 | 명지대학교 산학협력단 | A compensation method for the distorted secondary current of a current transformer |
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