CN111929519B - Method and device for testing harmonic resistance of electric energy meter - Google Patents
Method and device for testing harmonic resistance of electric energy meter Download PDFInfo
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- CN111929519B CN111929519B CN202010789122.9A CN202010789122A CN111929519B CN 111929519 B CN111929519 B CN 111929519B CN 202010789122 A CN202010789122 A CN 202010789122A CN 111929519 B CN111929519 B CN 111929519B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
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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
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
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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
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention discloses a method for testing the harmonic resistance of an electric energy meter, which comprises the following steps: signal synthesis is carried out according to a detection mode and harmonic parameters preset by a received controller so as to obtain a detection signal; testing the electric energy meter to be tested through the detection signal; and obtaining an output current curve of the electric energy meter to be tested according to the test result, and determining the anti-harmonic performance of the electric energy meter based on the output current curve. The method comprises the steps of synthesizing signals according to a detection mode and harmonic parameters preset by a received controller; testing the electric energy meter to be tested through the detection signal; and acquiring an output current curve of the electric energy meter to be tested according to the test result, determining the harmonic resistance of the electric energy meter based on the output current curve, and evaluating the harmonic resistance of the electric energy meter. The invention also discloses a testing device for implementing the method.
Description
Technical Field
The invention relates to the technical field of electric energy meter testing, in particular to a method and a device for testing harmonic resistance of an electric energy meter.
Background
In the actual power utilization process, the waveform of the power grid is not a pure sine wave, and various harmonic sources such as power generation equipment, power transmission and distribution systems, electric equipment and the like can generate harmonic waves to be injected into the power grid, so that the voltage and the current of the power grid are distorted. Harmonics in the power grid have two main hazards to the electric energy meter: 1. the metering accuracy of the electric energy meter is affected, so that the metering error is increased; 2. damage is generated to electronic components in the electric energy meter, and the electric energy meter is seriously burnt out.
The influence of the harmonic wave on the metering precision of the electric energy meter is specifically required in national standard GB/T17215.321-2008 'static active electric energy meter (level 1 and level 2'), related test equipment and schemes are more, and the following 3 schemes are briefly described:
the ZL201320678823.0 discloses an electric energy meter harmonic test device, wherein a specific power supply and current harmonic generator generates alternating voltage and current, higher harmonic, direct current even harmonic, subharmonic and odd harmonic, the alternating voltage and the current and the higher harmonic, the direct current even harmonic, the subharmonic and the odd harmonic are provided for a tested meter and a standard meter, errors of the tested meter are calculated through electric energy metering difference values of the tested meter and the standard meter, errors of the tested meter are compared with errors under a sine wave power supply, and error influence quantity is detected.
ZL 201710852117.6 discloses a direct current and even harmonic test system and a method of an electric energy meter, wherein a specific voltage waveform generator outputs voltage waveforms required by test, the voltage waveforms are respectively connected with a standard calibrator and a voltage port of a detected meter through a voltage transformer VT2, and the voltage port of the standard calibrator is connected in parallel with the voltage port of the detected meter; the current waveform generator outputs current waveforms required by the test and is respectively connected with the current ports of the standard calibrator and the inspected meter, and the current ports of the standard calibrator are connected in series with the current ports of the inspected meter; the test signal passes through the detected meter and the standard calibrator at the same time, the standard calibrator adopts the precise sampling resistor to sample the current, thereby ensuring the metering accuracy of the standard calibrator under the influence of direct current and even harmonic waves without load matching.
ZL 201210530225.9 discloses a method for generating harmonic signals and a harmonic signal generator, and the specific harmonic signal generator generates harmonic signals based on a DSP chip and an FPGA chip. The DSP chip is used for acquiring the amplitude coefficient, the initial phase word and the frequency control word of the fundamental wave, and transmitting the amplitude coefficient, the initial phase word and the frequency control word corresponding to each subharmonic and fundamental wave table data to the FPGA chip; the FPGA chip is used for generating harmonic signals according to the information acquired by the DSP chip. The FPGA chip comprises a harmonic signal component acquisition unit and a harmonic addition unit; the harmonic signal component acquisition unit is used for generating each component fi (kTs) of the harmonic signal according to the information acquired by the DSP chip; the harmonic adding unit is configured to add the components of the harmonic signal generated by the harmonic signal component acquiring unit to generate a harmonic signal.
However, the prior art and equipment can only test the influence of the harmonic wave on the metering precision of the electric energy meter, and cannot test and evaluate the damage of the harmonic wave to the electric energy meter.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention is directed to a method and a device for testing the harmonic resistance of an electric energy meter, which are used for evaluating the harmonic resistance of the electric energy meter.
The invention discloses a method for testing the harmonic resistance of an electric energy meter, which is realized by the technical scheme and comprises the following steps:
signal synthesis is carried out according to a detection mode and harmonic parameters preset by a received controller so as to obtain a detection signal;
testing the electric energy meter to be tested through the detection signal;
and obtaining an output current curve of the electric energy meter to be tested according to the test result, and determining the anti-harmonic performance of the electric energy meter based on the output current curve.
Optionally, signal synthesis is performed according to a detection mode and harmonic parameters preset by the received controller, including:
and superposing harmonic signals into the fundamental wave signals according to a detection mode and harmonic parameters preset by the received controller so as to synthesize the signals.
Optionally, superimposing the harmonic signal into the fundamental wave signal according to a detection mode and a harmonic parameter preset by the received controller, including:
if the harmonic signal is a frequency sweep harmonic, the frequency sweep harmonic corresponds to a frequency sweep mode, and the harmonic signal is superimposed into the fundamental wave signal according to a starting frequency, an ending frequency, a frequency interval, a frequency sweep interval time and a fixed amplitude preset by a received controller;
if the harmonic signal is a sweeping harmonic, the sweeping harmonic corresponds to a sweeping mode, and the harmonic signal is superimposed into the fundamental wave signal according to a starting amplitude, an ending amplitude, an amplitude interval, a sweeping interval time and a fixed frequency preset by a received controller.
Optionally, the testing the electric energy meter to be tested through the detection signal includes:
for the sweep frequency mode, according to the fixed amplitude and the initial frequency, the frequency of the sweep frequency harmonic wave is adjusted according to the sweep frequency interval time and the frequency interval, and the tested electric energy meter is tested;
and for the amplitude sweeping mode, according to the fixed frequency and the initial amplitude, adjusting the amplitude of the amplitude sweeping harmonic according to the amplitude interval time and the amplitude interval, and testing the tested electric energy meter.
Optionally, obtaining an output current curve of the electric energy meter to be tested according to the test result, determining the anti-harmonic performance of the electric energy meter based on the output current curve, including:
for the sweep frequency mode, an output current curve and a harmonic frequency curve of the electric energy meter to be tested are obtained, and the anti-harmonic performance of the electric energy meter is determined according to the maximum value of the current and the corresponding harmonic frequency;
and for the amplitude sweeping mode, acquiring an output current curve and a harmonic amplitude curve of the electric energy meter to be tested, and determining the anti-harmonic performance of the electric energy meter according to the zero current and the corresponding harmonic amplitude.
The second object of the invention is realized by the technical scheme, which is a testing device for the harmonic resistance of the electric energy meter, comprising:
the program-controlled harmonic source is used for carrying out signal synthesis according to a detection mode and harmonic parameters preset by the received controller so as to obtain a detection signal;
the test unit is used for testing the electric energy meter to be tested through the detection signal;
and the controller is used for acquiring an output current curve of the electric energy meter to be tested according to the test result, and determining the anti-harmonic performance of the electric energy meter based on the output current curve.
Optionally, the programmable harmonic source includes:
and the signal synthesis module is used for superposing harmonic signals into the fundamental wave signals according to the detection mode and the harmonic parameters preset by the received controller so as to synthesize the signals.
Optionally, the signal synthesis module is further configured to:
if the harmonic signal is a frequency sweep harmonic, the frequency sweep harmonic corresponds to a frequency sweep mode, and the harmonic signal is superimposed into the fundamental wave signal according to a starting frequency, an ending frequency, a frequency interval, a frequency sweep interval time and a fixed amplitude preset by a received controller;
if the harmonic signal is a sweeping harmonic, the sweeping harmonic corresponds to a sweeping mode, and the harmonic signal is superimposed into the fundamental wave signal according to a starting amplitude, an ending amplitude, an amplitude interval, a sweeping interval time and a fixed frequency preset by a received controller.
Optionally, the test unit is further configured to:
for the sweep frequency mode, according to the fixed amplitude and the initial frequency, the frequency of the sweep frequency harmonic wave is adjusted according to the sweep frequency interval time and the frequency interval, and the tested electric energy meter is tested;
and for the amplitude sweeping mode, according to the fixed frequency and the initial amplitude, adjusting the amplitude of the amplitude sweeping harmonic according to the amplitude interval time and the amplitude interval, and testing the tested electric energy meter.
Optionally, the controller is further configured to:
for the sweep frequency mode, an output current curve and a harmonic frequency curve of the electric energy meter to be tested are obtained, and the anti-harmonic performance of the electric energy meter is determined according to the maximum value of the current and the corresponding harmonic frequency;
and for the amplitude sweeping mode, acquiring an output current curve and a harmonic amplitude curve of the electric energy meter to be tested, and determining the anti-harmonic performance of the electric energy meter according to the zero current and the corresponding harmonic amplitude.
Due to the adoption of the technical scheme, the invention has the following advantages: the method comprises the steps of synthesizing signals according to a detection mode and harmonic parameters preset by a received controller; testing the electric energy meter to be tested through the detection signal; and acquiring an output current curve of the electric energy meter to be tested according to the test result, and determining the harmonic resistance of the electric energy meter based on the output current curve, so that the harmonic resistance of the electric energy meter is evaluated.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
The drawings of the present invention are described as follows:
FIG. 1 is a flow chart of a first embodiment of the present invention;
FIG. 2 is a flowchart of a first embodiment of the present invention for implementing a swept harmonic;
FIG. 3 is a flow chart of a first embodiment of the invention for amplitude-swept harmonic implementation;
FIG. 4 is a schematic view of a device according to a second embodiment of the present invention;
FIG. 5 is a schematic diagram of a second embodiment of the present invention;
FIG. 6 is a schematic diagram of signal synthesis according to a second embodiment of the present invention;
FIG. 7 is a schematic diagram of a current detecting unit according to a second embodiment of the present invention;
FIG. 8 is a schematic diagram of current monitoring according to a second embodiment of the present invention;
fig. 9-10 are device test flows according to a second embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and examples.
Example 1
The first embodiment of the invention provides a method for testing the harmonic resistance of an electric energy meter, as shown in fig. 1, comprising the following steps:
s101, signal synthesis is carried out according to a detection mode and harmonic parameters preset by a received controller so as to obtain a detection signal;
s102, testing the electric energy meter to be tested through the detection signal;
and S103, acquiring an output current curve of the electric energy meter to be tested according to the test result, and determining the anti-harmonic performance of the electric energy meter based on the output current curve.
The method comprises the steps of synthesizing signals according to a detection mode and harmonic parameters preset by a received controller; testing the electric energy meter to be tested through the detection signal; and acquiring an output current curve of the electric energy meter to be tested according to the test result, and determining the harmonic resistance of the electric energy meter based on the output current curve, so that the harmonic resistance of the electric energy meter is evaluated.
Optionally, signal synthesis is performed according to a detection mode and harmonic parameters preset by the received controller, including:
and superposing harmonic signals into the fundamental wave signals according to a detection mode and harmonic parameters preset by the received controller so as to synthesize the signals.
Specifically, in this embodiment, the signal synthesis may be completed by controlling the harmonic signal generator and the fundamental wave signal generator, where the harmonic signal generator outputs a corresponding harmonic frequency and harmonic amplitude, the fundamental wave signal generator outputs a 50Hz sine wave signal, the fundamental wave signal and the harmonic signal are synthesized by the signal, and the harmonic wave is superimposed on the fundamental wave signal, and after the signal synthesis, the signal may be further amplified in power, so as to increase the output power of the signal.
Optionally, superimposing the harmonic signal into the fundamental wave signal according to a detection mode and a harmonic parameter preset by the received controller, including:
if the harmonic signal is a frequency sweep harmonic, the frequency sweep harmonic corresponds to a frequency sweep mode, and the harmonic signal is superimposed into the fundamental wave signal according to a starting frequency, an ending frequency, a frequency interval, a frequency sweep interval time and a fixed amplitude preset by a received controller;
if the harmonic signal is a sweeping harmonic, the sweeping harmonic corresponds to a sweeping mode, and the harmonic signal is superimposed into the fundamental wave signal according to a starting amplitude, an ending amplitude, an amplitude interval, a sweeping interval time and a fixed frequency preset by a received controller.
Specifically, in this embodiment, the harmonic signals include a sweep frequency harmonic and a sweep amplitude harmonic, where the harmonic parameters of the sweep frequency harmonic include a start frequency, an end frequency, a frequency interval, a sweep interval time, and a fixed amplitude, and the harmonic parameters of the sweep amplitude harmonic include a start amplitude, an end amplitude, an amplitude interval, a sweep interval time, and a fixed frequency, and according to these harmonic parameters, the corresponding harmonic signals are superimposed in the 50Hz sinusoidal fundamental wave signal output by the fundamental wave signal generator.
Optionally, the testing the electric energy meter to be tested through the detection signal includes:
for the sweep frequency mode, according to the fixed amplitude and the initial frequency, the frequency of the sweep frequency harmonic wave is adjusted according to the sweep frequency interval time and the frequency interval, and the tested electric energy meter is tested;
and for the amplitude sweeping mode, according to the fixed frequency and the initial amplitude, adjusting the amplitude of the amplitude sweeping harmonic according to the amplitude interval time and the amplitude interval, and testing the tested electric energy meter.
Specifically, as shown in fig. 2, for the sweep frequency mode, according to a fixed amplitude and a starting frequency, the sweep frequency interval time, that is, the fixed delay, is increased according to the frequency interval on the basis of the starting frequency, and each sweep frequency interval time is increased by one frequency interval until the final harmonic frequency is greater than or equal to the ending frequency, and the electric energy meter to be tested is tested in the process of adjusting the frequency.
For the sweep frequency mode, as shown in fig. 3, the sweep interval time, that is, the fixed delay time is increased according to the fixed frequency and the initial amplitude according to the amplitude interval on the basis of the initial amplitude, and each sweep interval time is increased by one amplitude interval until the final harmonic amplitude is greater than or equal to the end amplitude, and the electric energy meter to be tested is tested in the process of adjusting the amplitude.
Optionally, obtaining an output current curve of the electric energy meter to be tested according to the test result, determining the anti-harmonic performance of the electric energy meter based on the output current curve, including:
for the sweep frequency mode, an output current curve and a harmonic frequency curve of the electric energy meter to be tested are obtained, and the anti-harmonic performance of the electric energy meter is determined according to the maximum value of the current and the corresponding harmonic frequency;
and for the amplitude sweeping mode, acquiring an output current curve and a harmonic amplitude curve of the electric energy meter to be tested, and determining the anti-harmonic performance of the electric energy meter according to the zero current and the corresponding harmonic amplitude.
Specifically, the obtaining of the output current curve and the harmonic frequency curve of the electric energy meter to be tested and the obtaining of the output current curve and the harmonic amplitude curve of the electric energy meter to be tested can be completed through the current monitoring unit, the controller can detect the current of the electric energy meter to be tested through the current monitoring unit, the anti-harmonic performance of the electric energy meter is determined according to the maximum value of the current and the corresponding harmonic frequency for the sweep frequency mode, and the anti-harmonic performance of the electric energy meter is determined according to the zero current and the corresponding harmonic amplitude for the sweep frequency mode.
The method can test the most sensitive harmonic frequency of the electric energy meter, evaluate the bearing capacity of the electric energy meter under the most sensitive harmonic, and finally realize the evaluation of the harmonic resistance of the electric energy meter.
The second object of the present invention is achieved by the technical scheme, which is a testing device for the harmonic resistance of an electric energy meter, as shown in fig. 4, comprising:
the program-controlled harmonic source is used for carrying out signal synthesis according to a detection mode and harmonic parameters preset by the received controller so as to obtain a detection signal;
the test unit is used for testing the electric energy meter to be tested through the detection signal;
and the controller is used for acquiring an output current curve of the electric energy meter to be tested according to the test result, and determining the anti-harmonic performance of the electric energy meter based on the output current curve.
Specifically, as shown in fig. 4, the test unit may be disposed in the program-controlled harmonic source or separately disposed, and the obtaining of the output current curve of the electric energy meter to be tested according to the test result may be completed by disposing the current detection unit between the program-controlled harmonic source and the electric energy meter to be tested, and the controller may obtain the output current curve of the electric energy meter to be tested by receiving the signal of the current detection unit.
The invention synthesizes signals according to the detection mode and harmonic parameters preset by the received controller; testing the electric energy meter to be tested through the detection signal; and acquiring an output current curve of the electric energy meter to be tested according to the test result, and determining the harmonic resistance of the electric energy meter based on the output current curve, so that the harmonic resistance of the electric energy meter is evaluated.
Optionally, the programmable harmonic source includes:
and the signal synthesis module is used for superposing harmonic signals into the fundamental wave signals according to the detection mode and the harmonic parameters preset by the received controller so as to complete signal synthesis.
Specifically, in this embodiment, as shown in fig. 5, the program-controlled harmonic source includes a single-chip microcomputer, a fundamental wave signal generator, a harmonic wave signal generator, a signal synthesis module and a power amplifier, after receiving an instruction from a controller, the single-chip microcomputer controls the fundamental wave signal generator and the harmonic wave signal generator to perform signal synthesis through the signal synthesis module, further, after receiving an instruction from the controller, the single-chip microcomputer controls the harmonic signal generator and the fundamental wave signal generator, the harmonic signal generator outputs corresponding harmonic frequency and harmonic amplitude, and the fundamental wave signal generator outputs a 50Hz sine wave signal. The fundamental wave signal and the harmonic wave signal are synthesized through the signals, the harmonic wave is overlapped on the fundamental wave signal, and then the output power of the signals is improved through the power amplifier.
The fundamental wave signal generator and the harmonic wave signal generator adopt the same implementation scheme and are realized by a direct digital frequency synthesizer chip, namely a DDS chip. As shown in fig. 6, the signal synthesizing module may be implemented using a differential operational amplifier. The program-controlled harmonic source can output various types of harmonic signals, mainly including sweep frequency harmonic signals, sweep amplitude signals with single harmonic frequency and the like.
Optionally, the signal synthesis module is further configured to:
if the harmonic signal is a frequency sweep harmonic, the frequency sweep harmonic corresponds to a frequency sweep mode, and the harmonic signal is superimposed into the fundamental wave signal according to a starting frequency, an ending frequency, a frequency interval, a frequency sweep interval time and a fixed amplitude preset by a received controller;
if the harmonic signal is a sweeping harmonic, the sweeping harmonic corresponds to a sweeping mode, and the harmonic signal is superimposed into the fundamental wave signal according to a starting amplitude, an ending amplitude, an amplitude interval, a sweeping interval time and a fixed frequency preset by a received controller.
Specifically, in this embodiment, the harmonic signals include a sweep frequency harmonic and a sweep amplitude harmonic, where the harmonic parameters of the sweep frequency harmonic include a start frequency, an end frequency, a frequency interval, a sweep interval time, and a fixed amplitude, and the harmonic parameters of the sweep amplitude harmonic include a start amplitude, an end amplitude, an amplitude interval, a sweep interval time, and a fixed frequency, and according to these harmonic parameters, the corresponding harmonic signals are superimposed in the 50Hz sinusoidal fundamental wave signal output by the fundamental wave signal generator.
Optionally, the test unit is further configured to:
for the sweep frequency mode, according to the fixed amplitude and the initial frequency, the frequency of the sweep frequency harmonic wave is adjusted according to the sweep frequency interval time and the frequency interval, and the tested electric energy meter is tested;
and for the amplitude sweeping mode, according to the fixed frequency and the initial amplitude, adjusting the amplitude of the amplitude sweeping harmonic according to the amplitude interval time and the amplitude interval, and testing the tested electric energy meter.
Specifically, for the sweep frequency mode, the sweep frequency interval time, that is, the fixed delay time is increased according to the frequency interval on the basis of the initial frequency according to the fixed amplitude and the initial frequency, the frequency interval is increased once for each sweep frequency interval time until the final harmonic frequency is greater than or equal to the end frequency, and the tested electric energy meter is tested in the process of adjusting the frequency.
And for the sweep frequency mode, increasing according to the fixed frequency and the initial amplitude according to the sweep interval time, namely the fixed delay, on the basis of the initial amplitude according to the amplitude interval, increasing the amplitude interval once for each sweep interval time until the final harmonic amplitude is more than or equal to the end amplitude, and testing the tested electric energy meter in the process of adjusting the amplitude.
The controller is further configured to:
for the sweep frequency mode, an output current curve and a harmonic frequency curve of the electric energy meter to be tested are obtained, and the anti-harmonic performance of the electric energy meter is determined according to the maximum value of the current and the corresponding harmonic frequency;
and for the amplitude sweeping mode, acquiring an output current curve and a harmonic amplitude curve of the electric energy meter to be tested, and determining the anti-harmonic performance of the electric energy meter according to the zero current and the corresponding harmonic amplitude.
Specifically, as shown in fig. 4, the obtaining of the output current curve of the electric energy meter to be tested according to the test result may be completed by setting a current detection unit between the program-controlled harmonic source and the electric energy meter to be tested by current, as shown in fig. 7, the current detection unit includes a current conversion voltage, a signal amplification, a signal detection, an ADC and a single chip microcomputer which are sequentially connected, and more specifically, as shown in fig. 8, the current conversion voltage is mainly realized by a resistor R7; the current is converted into a corresponding voltage signal after passing through a resistor R7. The signal amplification is mainly realized by a resistor R6, a resistor R8, a resistor R9 and an operational amplifier U1B; the amplification factor of the amplifier can be designed through the resistor R8 and the resistor R9. The signal detection mainly comprises a diode D1 and a capacitor C1; d1 is a detector diode. The diode D1 converts the alternating voltage into a direct voltage; capacitor C1 integrates the dc voltage. The ADC mainly converts an analog voltage signal into a digital signal.
The controller can be a PC or a notebook, and mainly realizes the following functions through a human-computer interaction interface: controlling the output frequency and amplitude of the harmonic generator; controlling the output frequency and amplitude of the fundamental wave signal, wherein the fundamental wave frequency of the equipment is set to be 50Hz, and the amplitude is set to be 220V; receiving a signal input by current inspection, and analyzing the current; a plot of current versus harmonic frequency is shown.
As shown in fig. 9-10, in a specific embodiment, the output curves of the electric energy meter to be tested in the sweep frequency mode and the sweep amplitude mode and the corresponding harmonic curves can be obtained by setting the corresponding harmonic parameters on the PC, for the sweep frequency mode, the anti-harmonic performance of the electric energy meter is determined according to the maximum current value and the corresponding harmonic frequency, for the sweep amplitude mode, the anti-harmonic performance of the electric energy meter is determined according to the zero current value and the corresponding harmonic amplitude.
The device has the following advantages:
the harmonic signal generator and the fundamental wave generator of the testing device adopt independent direct digital frequency synthesizer (DDS), so that the independent control of harmonic waves is facilitated;
the testing device has a current checking function, so that the harmonic load condition of the electric energy meter can be effectively evaluated;
the testing device can output a harmonic signal of the sweep frequency;
the testing device can output a scanning signal with single harmonic frequency;
the test device can intuitively display the sensitivity of the electric energy meter to different harmonic frequencies;
the method comprises the steps of finding out the most sensitive harmonic frequency of the electric energy meter through the relation between sweep frequency harmonic and current, fixing the most sensitive harmonic frequency, outputting a sweep signal, and effectively evaluating the maximum harmonic amplitude which can be born by the electric energy meter.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, and any modifications and equivalents are intended to be included within the scope of the invention.
Claims (2)
1. The method for testing the harmonic resistance of the electric energy meter is characterized by comprising the following steps of:
according to a detection mode and harmonic parameters preset by a received controller, adding harmonic signals into fundamental wave signals, and carrying out signal synthesis to obtain detection signals;
testing the electric energy meter to be tested through the detection signal;
acquiring an output current curve of the electric energy meter to be tested according to a test result, and determining the anti-harmonic performance of the electric energy meter based on the output current curve;
if the harmonic signal is a frequency sweep harmonic, the frequency sweep harmonic corresponds to a frequency sweep mode, the harmonic signal is superimposed into a fundamental wave signal according to a starting frequency, an ending frequency, a frequency interval, a frequency sweep interval time and a fixed amplitude preset by a received controller, and the measured electric energy meter is tested according to the frequency of the frequency sweep interval time and the frequency interval according to the fixed amplitude and the starting frequency, after an output current curve and a harmonic frequency curve of the measured electric energy meter are obtained, the anti-harmonic performance of the electric energy meter is determined according to a current maximum value and the corresponding harmonic frequency;
if the harmonic signal is a sweeping harmonic, the sweeping harmonic corresponds to a sweeping mode, the harmonic signal is superimposed into the fundamental wave signal according to a starting amplitude, an ending amplitude, an amplitude interval, a sweeping interval time and a fixed frequency preset by a received controller, the amplitude of the sweeping harmonic is adjusted according to the sweeping interval time and the amplitude interval according to the fixed frequency and the starting amplitude, the tested electric energy meter is tested, and after an output current curve and a harmonic value curve of the tested electric energy meter are obtained, the anti-harmonic performance of the electric energy meter is determined according to zero current and the corresponding harmonic amplitude.
2. The utility model provides a testing arrangement of anti harmonic ability of electric energy meter which characterized in that includes:
the program-controlled harmonic source comprises a signal synthesis module, and is used for superposing harmonic signals into fundamental wave signals according to a detection mode and harmonic parameters preset by a received controller, and carrying out signal synthesis to obtain detection signals;
the signal synthesis module is further configured to: if the harmonic signal is a frequency sweep harmonic, the frequency sweep harmonic corresponds to a frequency sweep mode, and the harmonic signal is superimposed into the fundamental wave signal according to a starting frequency, an ending frequency, a frequency interval, a frequency sweep interval time and a fixed amplitude preset by a received controller; if the harmonic signal is a sweeping amplitude harmonic, the sweeping amplitude harmonic corresponds to a sweeping amplitude mode, and the harmonic signal is superimposed into the fundamental wave signal according to a starting amplitude, an ending amplitude, an amplitude interval, a sweeping amplitude interval time and a fixed frequency preset by a received controller;
a test unit, the test unit further configured to: for the sweep frequency mode, according to the fixed amplitude and the initial frequency, the frequency of the sweep frequency harmonic wave is adjusted according to the sweep frequency interval time and the frequency interval, and the tested electric energy meter is tested; for the amplitude sweeping mode, according to the fixed frequency and the initial amplitude, the amplitude of the amplitude sweeping harmonic wave is adjusted according to the amplitude interval time and the amplitude interval, and the electric energy meter to be tested is tested;
a controller, the controller further configured to: for the sweep frequency mode, an output current curve and a harmonic frequency curve of the electric energy meter to be tested are obtained, and the anti-harmonic performance of the electric energy meter is determined according to the maximum value of the current and the corresponding harmonic frequency; and for the amplitude sweeping mode, acquiring an output current curve and a harmonic amplitude curve of the electric energy meter to be tested, and determining the anti-harmonic performance of the electric energy meter according to the zero current and the corresponding harmonic amplitude.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010789122.9A CN111929519B (en) | 2020-08-07 | 2020-08-07 | Method and device for testing harmonic resistance of electric energy meter |
Applications Claiming Priority (1)
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