CN112816752B - Temperature compensation method and equipment for capacitive mutual inductor - Google Patents
Temperature compensation method and equipment for capacitive mutual inductor Download PDFInfo
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- CN112816752B CN112816752B CN202011527937.6A CN202011527937A CN112816752B CN 112816752 B CN112816752 B CN 112816752B CN 202011527937 A CN202011527937 A CN 202011527937A CN 112816752 B CN112816752 B CN 112816752B
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- 238000001514 detection method Methods 0.000 claims description 29
- 238000013507 mapping Methods 0.000 claims description 28
- 238000004590 computer program Methods 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 abstract description 16
- 238000005259 measurement Methods 0.000 abstract description 7
- 230000006870 function Effects 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
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Classifications
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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
- G01R15/04—Voltage dividers
- G01R15/06—Voltage dividers having reactive components, e.g. capacitive transformer
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention relates to a temperature compensation method and equipment for a capacitor transformer, which are characterized in that primary voltage amplitude of the capacitor transformer is detected, environmental temperature information is obtained, and then the primary voltage amplitude and the environmental temperature information are processed by adopting a preset temperature compensation model to obtain secondary voltage amplitude of the capacitor transformer, so that the secondary voltage amplitude can be obtained without measurement, and is an empirical value obtained through learning historical data.
Description
Technical Field
The invention relates to the technical field of radio frequency identification, in particular to a temperature compensation method and equipment for a capacitive transformer.
Background
The voltage transformer is mainly used for voltage measurement and electric energy measurement in an electric power system, and along with the rapid development of an optical fiber sensing technology and an optical fiber communication technology, the performance of the voltage transformer is also required to be higher in some application scenes.
Compared with the traditional electromagnetic voltage transformer, the capacitive voltage transformer (also called as a capacitive transformer) has a plurality of advantages in economy and safety besides preventing ferromagnetic resonance caused by the saturation of the iron core of the voltage transformer. The capacitive voltage division type electronic voltage transformer gradually replaces the traditional voltage transformer due to the advantages of high precision, wide frequency band and small volume, and is applied to voltage measurement of a power system. However, the measurement accuracy of the capacitive voltage division type electronic voltage transformer is easily affected by temperature, so that errors exist between the actual secondary voltage amplitude and the theoretical secondary voltage amplitude, and further, when the detection equipment is selected to actually measure the secondary voltage amplitude, the measuring range is easily out of range, and the detection equipment is damaged.
Disclosure of Invention
Based on this, it is necessary to provide a method and apparatus for temperature compensation of a capacitive transformer.
A method of temperature compensation for a capacitive transformer, comprising:
detecting the primary voltage amplitude of the capacitive mutual inductor;
acquiring environmental temperature information and a transformation ratio of the capacitive mutual inductor;
and processing the primary voltage amplitude, the ambient temperature information and the transformation ratio by adopting a preset temperature compensation model to obtain the secondary voltage amplitude of the capacitive mutual inductor.
In one embodiment, the processing the primary voltage amplitude, the ambient temperature information, and the transformation ratio to obtain the secondary voltage amplitude of the capacitive transformer using a preset temperature compensation model includes:
acquiring a ratio difference value according to the environmental temperature information based on a mapping relation between the environmental temperature and the ratio difference in the preset temperature compensation model;
and processing the primary voltage amplitude, the ratio difference value and the transformation ratio by adopting the preset temperature compensation model to obtain the secondary voltage amplitude.
In one embodiment, the method for compensating the temperature of the capacitive mutual inductor further comprises:
detecting a primary voltage phase angle of the capacitive transformer;
and processing the primary voltage phase angle and the environmental temperature information by adopting the preset temperature compensation model to acquire the secondary voltage phase angle of the capacitive transformer.
In one embodiment, the processing the primary voltage phase angle and the ambient temperature information to obtain the secondary voltage phase angle of the capacitive transformer using the preset temperature compensation model includes:
acquiring an angle difference value according to the environmental temperature information based on the mapping relation between the environmental temperature and the angle difference in the preset temperature compensation model;
and processing the primary voltage phase angle and the angle difference by adopting the preset temperature compensation model to obtain the secondary voltage phase angle.
In one embodiment, before the processing the primary voltage amplitude, the ambient temperature information and the transformation ratio with the preset temperature compensation model and the processing the primary voltage phase angle and the ambient temperature information with the preset temperature compensation model, the method for temperature compensation of the capacitive transformer further includes:
detecting the input voltage of the capacitive mutual inductor;
and acquiring the preset temperature compensation model from the model set according to the input voltage.
In one embodiment, the method for compensating the temperature of the capacitive mutual inductor further comprises:
acquiring a plurality of groups of sample input voltages, sample primary voltage amplitudes, sample primary voltage phase angles, sample secondary voltage amplitudes and sample secondary voltage phase angles which respectively correspond to the environmental temperatures;
generating a model set according to each group of the sample input voltage, the sample primary voltage amplitude, the sample primary voltage phase angle, the sample secondary voltage amplitude, the sample secondary voltage phase angle and the transformation ratio, wherein the model set comprises a plurality of preset temperature compensation models corresponding to each sample input voltage.
In one embodiment, the generating the model set from each set of the sample input voltage, sample primary voltage amplitude, sample primary voltage phase angle, sample secondary voltage amplitude, sample secondary voltage phase angle, and the transformation ratio comprises:
obtaining a difference value of each sample ratio according to each group of the primary sample voltage amplitude, the secondary sample voltage amplitude and the transformation ratio;
obtaining each sample angle difference value according to each group of the sample primary voltage phase angles and the sample secondary voltage phase angles;
generating a plurality of preset temperature compensation models according to the sample ratio differences and the sample angle differences;
and generating the model set according to each sample input voltage and each preset temperature compensation model.
In one embodiment, the method for compensating the temperature of the capacitive mutual inductor further comprises:
acquiring a secondary voltage detection value of the capacitive mutual inductor;
and correcting the capacitance transformer according to the secondary voltage detection value.
A capacitive transformer temperature compensation apparatus comprising:
the detection module is used for detecting the primary voltage amplitude of the capacitance transformer;
the acquisition module is used for acquiring environmental temperature information and the transformation ratio of the capacitance transformer;
and the processor is used for processing the primary voltage amplitude, the environmental temperature information and the transformation ratio by adopting a preset temperature compensation model so as to acquire the secondary voltage amplitude of the capacitance transformer.
A capacitive transducer temperature compensation apparatus comprising a memory storing a computer program and a processor implementing the steps of any of the methods described above when the computer program is executed.
According to the temperature compensation method and the temperature compensation equipment for the capacitor transformer, the primary voltage amplitude of the capacitor transformer is detected, the environmental temperature information is obtained, and then the primary voltage amplitude and the environmental temperature information are processed by adopting the preset temperature compensation model to obtain the secondary voltage amplitude of the capacitor transformer, so that the secondary voltage amplitude can be obtained under the condition that measurement is not needed, and the secondary voltage amplitude is an empirical value obtained through learning historical data.
Drawings
In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings required for the descriptions of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic flow chart of a temperature compensation method of a capacitive transformer according to an embodiment;
FIG. 2 is a schematic circuit diagram of a capacitive dividing section of the capacitive transformer;
FIG. 3 is a flow chart illustrating a temperature compensation method of a capacitive transformer according to another embodiment;
FIG. 4 is a flow chart of a temperature compensation method of a capacitive transformer according to another embodiment;
FIG. 5 is a flow chart illustrating a temperature compensation method of a capacitive transformer according to another embodiment;
FIG. 6 is a flow chart of a temperature compensation method of a capacitive transformer according to another embodiment;
FIG. 7 is a flow chart of a temperature compensation method of a capacitive transformer according to another embodiment;
fig. 8 is a flow chart of a temperature compensation method of a capacitive transformer according to another embodiment.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described 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 herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that the terms "first," "second," and the like, as used herein, may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. 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. Both the first resistor and the second resistor are resistors, but they are not the same resistor.
It is to be understood that in the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", etc., if the connected circuits, modules, units, etc., have electrical or data transfer between them.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.
The capacitive mutual inductor comprises two parts, wherein one part is a capacitive voltage division part, namely a primary part, and is used for coupling and voltage division; the other part is the data processing part, i.e. the secondary part. The capacitance temperature coefficient of the capacitive voltage division part is the same, so that the influence of temperature on the voltage division is negligible, and the influence of temperature on the capacitive transformer is mainly from the data processing part, namely the secondary part.
Fig. 1 is a flow chart illustrating a temperature compensation method of a capacitive transformer according to an embodiment, as shown in fig. 1, the temperature compensation method of the capacitive transformer includes steps S110 to S130.
In step S110, the primary voltage amplitude of the capacitive transformer is detected.
FIG. 2 is a schematic circuit diagram of a capacitive voltage division portion of the capacitive transformer, as shown in FIG. 2, the primary voltage amplitude, i.e., capacitor C 2 Corresponding voltage U 2 Voltage U 2 Is the input voltage of the data processing section.
And step S120, acquiring environmental temperature information and a transformation ratio of the capacitive transformer.
The temperature sensor is used for acquiring environmental temperature information; the transformation ratio of the capacitive mutual inductor can be obtained according to the product model.
And step S130, processing the primary voltage amplitude, the ambient temperature information and the transformation ratio by adopting a preset temperature compensation model to obtain the secondary voltage amplitude of the capacitive mutual inductor.
The preset temperature compensation model may store a mapping relationship between a primary voltage amplitude, ambient temperature information and a transformation ratio and a secondary voltage amplitude, for example, the mapping relationship may be stored in the preset temperature compensation model in the form of a function, a correspondence table and a fitting curve, and the secondary voltage amplitude of the capacitive transformer may be obtained according to the measured primary voltage amplitude, ambient temperature information and transformation ratio based on the preset temperature compensation model.
It can be understood that the capacitive transformer is generally used for reducing the input voltage, and then the output end of the capacitive transformer can be connected with the detection device to detect the output voltage of the capacitive transformer, because the transformation ratio and the voltage division capacitance parameters of the capacitive transformer are known, when the detection device is used for detection, the secondary voltage amplitude can be calculated according to the input voltage and each parameter, so as to select the measuring range of the detection device, when the environment temperature changes, the secondary voltage amplitude calculated according to the parameters of the capacitive transformer in the rated working environment can have errors with the true value due to the influence on the precision of the capacitive transformer, and if the measuring range of the detection device is still selected according to the calculated secondary voltage amplitude, the measuring range can be overlarge or overlarge, so that the situation that the detection device is damaged due to inaccurate measurement or exceeding the measuring range can occur. In the embodiment, the influence of temperature on the capacitor transformer is considered, the preset temperature compensation model can be utilized to obtain the secondary voltage amplitude, and the secondary voltage amplitude is an empirical value obtained through learning historical data and is closer to a real value, so that the detection equipment is not easy to damage due to the range selection 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 value range where the real value is located.
According to the embodiment of the invention, the primary voltage amplitude of the capacitor transformer is detected, the ambient temperature information and the transformation ratio of the capacitor transformer are obtained, then the primary voltage amplitude, the transformation ratio and the ambient temperature information are processed by adopting the preset temperature compensation model to obtain the actual theoretical secondary voltage amplitude of the capacitor transformer, the secondary voltage amplitude is an empirical value obtained through learning historical data, and the influence of the ambient temperature is considered to be closer to the actual secondary voltage amplitude, so that the detection equipment is not easy to damage due to the range selection 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 attached to the numerical range where the actual value is located.
Fig. 3 is a schematic flow chart of a temperature compensation method of a capacitive transformer according to another embodiment, which is different from the embodiment of fig. 1 only in that the steps of processing the primary voltage amplitude, the ambient temperature information and the transformation ratio by using a preset temperature compensation model to obtain the secondary voltage amplitude of the capacitive transformer further include step S131 and step S132.
Step S131, based on the mapping relation between the ambient temperature and the ratio difference in the preset temperature compensation model, the ratio difference is obtained according to the ambient temperature information.
It can be understood that the ambient temperature can affect the secondary voltage of the capacitive transformer, the preset temperature compensation model stores the mapping relation between the ratio difference of the capacitive transformer and the ambient temperature, and the mapping relation can be specifically in the forms of a function, a corresponding table, a fitting curve and the like, and based on the mapping relation, the ratio difference of the capacitive transformer can be obtained according to the ambient temperature information.
Step S132, processing the primary voltage amplitude, the transformation ratio and the ratio difference by adopting a preset temperature compensation model to obtain a secondary voltage amplitude.
It can be understood that the obtained ratio difference is an error value affected by the ambient temperature, the preset temperature compensation model can store a mapping relationship between the primary voltage amplitude, the transformation ratio and the ratio difference and the secondary voltage amplitude, and the secondary voltage amplitude can be obtained according to the known primary voltage amplitude, transformation ratio and ratio difference. In one embodiment, the mapping relationship may be a function formula, specifically, the sum of the primary voltage amplitude multiplied by the ratio difference and the primary voltage amplitude, and then the transformation ratio is calculated, and the secondary voltage amplitude in the true theory can be finally obtained according to the function formula.
The embodiment of the invention obtains the ratio difference value according to the environmental temperature information based on the mapping relation between the environmental temperature and the ratio difference in the preset temperature compensation model, and then processes the primary voltage amplitude, the ratio difference value and the transformation ratio by adopting the preset temperature compensation model to obtain the secondary voltage amplitude.
Fig. 4 is a schematic flow chart of a temperature compensation method of a capacitive transformer according to another embodiment, and compared with the embodiment of fig. 1, steps S410 to S420 are further added in this embodiment, as shown in fig. 4.
In step S410, the primary voltage phase angle of the capacitive transformer is detected.
The primary voltage phase angle can be measured by a voltage vector acquisition device.
Step S420, the primary voltage phase angle and the ambient temperature information are processed by adopting a preset temperature compensation model to obtain the secondary voltage phase angle of the capacitive mutual inductor.
It can be appreciated that the preset temperature compensation model may store a mapping relationship between the primary voltage phase angle and the ambient temperature information and the secondary voltage phase angle, for example, the mapping relationship may be stored in the preset temperature compensation model in the form of a function, a correspondence table, and a fitting curve, and the secondary voltage phase angle of the capacitive transformer may be obtained according to the measured primary voltage phase angle and the ambient temperature information based on the preset temperature compensation model.
It can be understood that under normal conditions, the phase difference between the secondary voltage and the primary voltage of the ideal capacitive transformer is 180 degrees, and when the ambient temperature deviates from the ideal temperature of the capacitive transformer, the phase angle of the secondary voltage also has an error, so that the primary voltage phase angle and the ambient temperature information can be processed by adopting a preset temperature compensation model, thereby directly acquiring the phase angle of the secondary voltage of the capacitive transformer, and being quick and accurate. In one embodiment, after the secondary voltage phase angle is obtained by using the preset temperature compensation model, it may be further determined whether the difference between the primary voltage phase angle and the secondary voltage phase angle exceeds a threshold value, and if the difference exceeds the threshold value, the capacitance transformer may be adjusted to offset the influence of the ambient temperature.
According to the embodiment of the invention, the primary voltage phase angle of the capacitor transformer is detected, and the primary voltage phase angle and the ambient temperature information are processed by adopting the preset temperature compensation model so as to obtain the secondary voltage phase angle of the capacitor transformer, so that the method is quick and accurate. And after the secondary voltage phase angle is obtained by using a preset temperature compensation model, whether the difference between the primary voltage phase angle and the secondary voltage phase angle exceeds a threshold value can be judged, and if the difference exceeds the threshold value, the capacitance transformer can be adjusted so as to offset the influence of the ambient temperature.
Fig. 5 is a schematic flow chart of a temperature compensation method for a capacitive transformer according to another embodiment, and the difference between the embodiment and the embodiment of fig. 4 is that the step of processing the primary voltage phase angle and the ambient temperature information to obtain the secondary voltage phase angle of the capacitive transformer by using the preset temperature compensation model includes steps S421 to S422.
Step S421, based on the mapping relation between the ambient temperature and the angular difference in the preset temperature compensation model, the angular difference is obtained according to the ambient temperature information.
It can be understood that the ambient temperature can affect the secondary voltage phase angle of the capacitive transformer, the preset temperature compensation model stores the mapping relation between the angular difference of the capacitive transformer and the ambient temperature, and the mapping relation can be specifically in the forms of a function, a corresponding table, a fitting curve and the like, and based on the mapping relation, the angular difference of the capacitive transformer can be obtained according to the ambient temperature information.
In step S422, the primary voltage phase angle and the angle difference are processed by using a preset temperature compensation model to obtain the secondary voltage phase angle.
It can be understood that the obtained angle difference value is an error value affected by the ambient temperature, the preset temperature compensation model can store a mapping relationship between a primary voltage phase angle and an angle difference value and a secondary voltage phase angle, and the secondary voltage phase angle can be obtained according to the known primary voltage phase angle and angle difference value. In one embodiment, the mapping relationship may be a functional formula, specifically, may be the sum of the primary voltage phase angle and the angle difference and the 180 ° angle, and according to the functional formula, the actual theoretical secondary voltage phase angle may be finally obtained.
According to the embodiment of the invention, based on the mapping relation between the ambient temperature and the angle difference in the preset temperature compensation model, the angle difference is obtained according to the ambient temperature information, and then the primary voltage phase angle and the angle difference are processed by the preset temperature compensation model to obtain the secondary voltage phase angle, so that the real theoretical secondary voltage phase angle is obtained.
Fig. 6 is a schematic flow chart of a temperature compensation method of a capacitive transformer according to another embodiment, which is different from the embodiment of fig. 4 only in that the temperature compensation method of the capacitive transformer further includes steps S610 to S620 before the primary voltage amplitude and the ambient temperature information are processed by using the preset temperature compensation model and the primary voltage phase angle and the ambient temperature information are processed by using the preset temperature compensation model.
In step S610, an input voltage of the capacitive transformer is detected.
It can be understood that the input voltage of the capacitive transformer is U in FIG. 2 1 For the same capacitive mutual inductor, when inputting electricityWhen the voltage is different, the amplitude and the phase angle of the actually output secondary voltage are also deviated from the amplitude and the phase angle of the theoretically output secondary voltage.
Step S620, acquiring a preset temperature compensation model from the model set according to the input voltage.
The model is stored with a plurality of preset temperature compensation models in a centralized manner, and as the input voltage can influence the amplitude and the phase angle of the secondary voltage, the specific difference value and the angular difference value are different when the input voltage is different, so that the corresponding preset temperature compensation models can be selected from the model set according to the input voltage, and the acquired amplitude and phase angle of the secondary voltage are higher in accuracy.
Fig. 7 is a flow chart of a temperature compensation method for a capacitive transformer according to another embodiment, where the temperature compensation method for a capacitive transformer in this embodiment further includes steps S710 to S720, as shown in fig. 7.
In step S710, a plurality of sets of sample input voltages, sample primary voltage amplitudes, sample primary voltage phase angles, sample secondary voltage amplitudes, and sample secondary voltage phase angles corresponding to the respective ambient temperatures are obtained.
In step S720, a model set is generated according to each set of sample input voltage, sample primary voltage amplitude, sample primary voltage phase angle, sample secondary voltage amplitude, sample secondary voltage phase angle and transformation ratio, wherein the model set comprises a plurality of preset temperature compensation models corresponding to each sample input voltage.
It will be appreciated that a model set is created from each sample data prior to acquiring a predetermined temperature compensation model from the model set based on the input voltage. Specifically, each group of sample values under the same sample input voltage can be assigned to one data set, then each sample value is modeled by taking the ambient temperature as a variable, so as to obtain a preset temperature compensation model corresponding to the sample input voltage, then the operation is repeated, and finally, a plurality of preset temperature compensation models corresponding to each sample input voltage are obtained, and a model set is generated. The preset temperature compensation model stores a mapping relation between primary voltage amplitude, ambient temperature information and transformation ratio and secondary voltage amplitude, and also stores a mapping relation between primary voltage phase angle, ambient temperature information and secondary voltage phase angle.
Fig. 8 is a schematic flow chart of a temperature compensation method of a capacitive transformer according to another embodiment, which is different from the embodiment of fig. 7 only in that the model set generating steps according to each set of the sample input voltage, the sample primary voltage amplitude, the sample primary voltage phase angle, the sample secondary voltage amplitude, the sample secondary voltage phase angle and the transformation ratio include steps S721 to S724.
In step S721, each sample ratio difference is obtained according to each group of sample primary voltage amplitude, sample secondary voltage amplitude and transformation ratio.
Wherein the sample ratio difference is equal to the product of the sample secondary voltage amplitude and the transformation ratio minus the sample primary voltage amplitude, and then the quotient of the sample primary voltage amplitude.
In step S722, each sample angle difference is obtained according to each group of sample primary voltage phase angles and sample secondary voltage phase angles.
Wherein the sample angle difference is equal to the phase difference between the sample secondary voltage phase angle minus 180 ° and the primary voltage phase angle.
Step S723, a plurality of preset temperature compensation models are generated according to the sample ratio differences and the sample angle differences.
It can be understood that each sample ratio difference value and each sample angle difference value are respectively in one-to-one correspondence with the ambient temperature, and a plurality of preset temperature compensation models can be generated according to each sample ratio difference value and each sample angle difference value by taking the ambient temperature as a variable.
Step S724, generating a model set according to each sample input voltage and each preset temperature compensation model.
It can be appreciated that, since the input voltage affects the magnitude of the secondary voltage and the phase angle of the secondary voltage, when the input voltage is different, the ratio difference and the angle difference are also different, so that the model set can be generated according to the corresponding relation between the input voltage and each preset temperature compensation model.
In one embodiment, the method for compensating the temperature of the capacitive transformer further comprises the steps of obtaining a secondary voltage detection value of the capacitive transformer, and correcting the capacitive transformer according to the secondary voltage detection value.
It can be understood that after the secondary voltage amplitude of the capacitive transformer is obtained, a detection device with a proper range can be selected to detect the capacitive transformer, so that an accurate secondary voltage detection value is obtained, and the capacitive transformer can be corrected. Specifically, the secondary voltage detection value can be compared with a theoretical secondary voltage amplitude value calculated according to the transformation ratio of the capacitive transformer, and if the error is too large, the capacitive transformer can be corrected.
It should be understood that, although the steps in the flowcharts of fig. 1 and 3-8 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps of FIGS. 1, 3-8 may include steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor do the order in which the steps or stages are performed necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a portion of the steps or stages in other steps.
The invention further provides a temperature compensation device for the capacitor transformer, which comprises a detection module, an acquisition module and a processor, wherein the detection module is used for detecting the primary voltage amplitude of the capacitor transformer, the acquisition module is used for acquiring the environmental temperature information, and the processor is used for processing the primary voltage amplitude and the environmental temperature information by adopting a preset temperature compensation model so as to acquire the secondary voltage amplitude of the capacitor transformer.
In one embodiment, the processor is further configured to obtain the ratio difference value according to the environmental temperature information based on a mapping relationship between the environmental temperature and the ratio difference in the preset temperature compensation model; and then processing the primary voltage amplitude, the ratio difference value and the transformation ratio by adopting a preset temperature compensation model to obtain a secondary voltage amplitude.
In one embodiment, the detection module is further configured to detect a primary voltage phase angle of the capacitive transformer; the processor is also used for processing the primary voltage phase angle and the ambient temperature information by adopting a preset temperature compensation model to obtain the secondary voltage phase angle of the capacitive mutual inductor.
In one embodiment, the processor is further configured to obtain the angular difference value according to the environmental temperature information based on a mapping relationship between the environmental temperature and the angular difference in the preset temperature compensation model; and processing the primary voltage phase angle and the angle difference by adopting a preset temperature compensation model to obtain a secondary voltage phase angle.
In one embodiment, the detection module is further configured to detect an input voltage of the capacitive transformer; the processor is also used for acquiring a preset temperature compensation model from the model set according to the input voltage.
In one embodiment, the obtaining module is further configured to obtain a plurality of sets of sample input voltages, sample primary voltage magnitudes, sample primary voltage phase angles, sample secondary voltage magnitudes, and sample secondary voltage phase angles, each corresponding to each ambient temperature; the processor is further configured to generate a model set based on each set of the sample input voltage, the sample primary voltage amplitude, the sample primary voltage phase angle, the sample secondary voltage amplitude, and the sample secondary voltage phase angle and the transformation ratio, the model set including a plurality of preset temperature compensation models corresponding to each sample input voltage.
In one embodiment, the processor is further configured to obtain each sample ratio difference value according to each set of the sample primary voltage amplitude value, the sample secondary voltage amplitude value and the transformation ratio, obtain each sample angle difference value according to each set of the sample primary voltage phase angle and the sample secondary voltage phase angle, generate a plurality of preset temperature compensation models according to each sample ratio difference value and each sample angle difference value, and finally generate a model set according to each sample input voltage and each preset temperature compensation model.
In one embodiment, the obtaining module is further configured to obtain a secondary voltage detection value of the capacitive transformer; the temperature compensation device of the capacitive mutual inductor further comprises a correction module used for correcting the capacitive mutual inductor according to the secondary voltage detection value.
The embodiment of the invention also provides a temperature compensation device for the capacitive mutual inductor, which comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the steps of the method of any embodiment when executing the computer program.
The present invention also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of the method of any of the above embodiments.
In the description of the present specification, reference to the terms "some embodiments," "other embodiments," "desired embodiments," and the like, means 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 descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A method for temperature compensation of a capacitive mutual inductor, comprising:
detecting primary voltage amplitude and primary voltage phase angle of a capacitive transformer;
acquiring environmental temperature information and a transformation ratio of the capacitive mutual inductor;
processing the primary voltage amplitude, the ambient temperature information and the transformation ratio by adopting a preset temperature compensation model to obtain a secondary voltage amplitude of the capacitance transformer;
processing the primary voltage phase angle and the environmental temperature information by adopting the preset temperature compensation model to obtain a secondary voltage phase angle of the capacitive transformer;
the method further comprises the steps of:
acquiring a plurality of groups of sample input voltages, sample primary voltage amplitudes, sample primary voltage phase angles, sample secondary voltage amplitudes and sample secondary voltage phase angles which respectively correspond to the environmental temperatures;
generating a model set according to each group of the sample input voltage, the sample primary voltage amplitude, the sample primary voltage phase angle, the sample secondary voltage amplitude, the sample secondary voltage phase angle and the transformation ratio, wherein the model set comprises a plurality of preset temperature compensation models corresponding to each sample input voltage.
2. The method of claim 1, wherein the processing the primary voltage magnitude, the ambient temperature information, and the transformation ratio to obtain the secondary voltage magnitude of the capacitive transformer using a preset temperature compensation model comprises:
acquiring a ratio difference value according to the environmental temperature information based on a mapping relation between the environmental temperature and the ratio difference in the preset temperature compensation model;
and processing the primary voltage amplitude, the ratio difference value and the transformation ratio by adopting the preset temperature compensation model to obtain the secondary voltage amplitude.
3. The method of claim 1, wherein processing the primary voltage phase angle and the ambient temperature information to obtain the secondary voltage phase angle of the capacitive transformer using the preset temperature compensation model comprises:
acquiring an angle difference value according to the environmental temperature information based on the mapping relation between the environmental temperature and the angle difference in the preset temperature compensation model;
and processing the primary voltage phase angle and the angle difference by adopting the preset temperature compensation model to obtain the secondary voltage phase angle.
4. The method of claim 1, wherein prior to processing the primary voltage magnitude, the ambient temperature information, and the transformation ratio using a preset temperature compensation model, and processing the primary voltage phase angle and the ambient temperature information using the preset temperature compensation model, the method further comprises:
detecting the input voltage of the capacitive mutual inductor;
and acquiring the preset temperature compensation model from the model set according to the input voltage.
5. The method of claim 1, wherein generating the set of models from each set of the sample input voltage, sample primary voltage magnitude, sample primary voltage phase angle, sample secondary voltage magnitude, sample secondary voltage phase angle, and the transformation ratio comprises:
obtaining a difference value of each sample ratio according to each group of the primary sample voltage amplitude, the secondary sample voltage amplitude and the transformation ratio;
obtaining each sample angle difference value according to each group of the sample primary voltage phase angles and the sample secondary voltage phase angles;
generating a plurality of preset temperature compensation models according to the sample ratio differences and the sample angle differences;
and generating the model set according to each sample input voltage and each preset temperature compensation model.
6. The method of temperature compensation of a capacitive transformer of claim 1, further comprising:
acquiring a secondary voltage detection value of the capacitive mutual inductor;
and correcting the capacitance transformer according to the secondary voltage detection value.
7. A capacitive transducer temperature compensation apparatus, comprising:
the detection module is used for detecting the primary voltage amplitude and the primary voltage phase angle of the capacitive transformer;
the acquisition module is used for acquiring environmental temperature information and the transformation ratio of the capacitance transformer;
the processor is used for processing the primary voltage amplitude, the environmental temperature information and the transformation ratio by adopting a preset temperature compensation model so as to obtain a secondary voltage amplitude of the capacitance transformer; the method is also used for processing the primary voltage phase angle and the environmental temperature information by adopting the preset temperature compensation model to obtain a secondary voltage phase angle of the capacitive transformer;
the acquisition module is further used for acquiring a plurality of groups of sample input voltages, sample primary voltage amplitudes, sample primary voltage phase angles, sample secondary voltage amplitudes and sample secondary voltage phase angles which respectively correspond to the environmental temperatures; generating a model set according to each group of the sample input voltage, the sample primary voltage amplitude, the sample primary voltage phase angle, the sample secondary voltage amplitude, the sample secondary voltage phase angle and the transformation ratio, wherein the model set comprises a plurality of preset temperature compensation models corresponding to each sample input voltage.
8. The apparatus of claim 7, wherein the processor is further configured to obtain a ratio difference value according to the ambient temperature information based on a mapping relationship between ambient temperature and the ratio difference in the preset temperature compensation model; and processing the primary voltage amplitude, the ratio difference value and the transformation ratio by adopting the preset temperature compensation model to obtain the secondary voltage amplitude.
9. The apparatus of claim 7, wherein the processor is further configured to obtain an angular difference value from the ambient temperature information based on a mapping of ambient temperature to an angular difference in the preset temperature compensation model; and processing the primary voltage phase angle and the angle difference by adopting the preset temperature compensation model to obtain the secondary voltage phase angle.
10. A capacitive mutual inductor temperature compensating device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, carries out the steps of the method according to any of claims 1 to 6.
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