CN111929519A - Method and device for testing anti-harmonic capability of electric energy meter - Google Patents
Method and device for testing anti-harmonic capability of electric energy meter Download PDFInfo
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- CN111929519A CN111929519A CN202010789122.9A CN202010789122A CN111929519A CN 111929519 A CN111929519 A CN 111929519A CN 202010789122 A CN202010789122 A CN 202010789122A CN 111929519 A CN111929519 A CN 111929519A
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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 harmonic resistance of an electric energy meter, which comprises the following steps: performing signal synthesis according to a received detection mode preset by a controller and a harmonic parameter to obtain a detection signal; testing the tested electric energy meter through the detection signal; and acquiring an output current curve of the tested electric energy meter according to the test result, and determining the anti-harmonic performance of the electric energy meter based on the output current curve. The method carries out signal synthesis according to a received detection mode and harmonic parameters preset by a controller; testing the tested electric energy meter through the detection signal; and acquiring an output current curve of the tested electric energy meter according to the test result, and determining the anti-harmonic performance of the electric energy meter based on the output current curve, thereby realizing the evaluation of the anti-harmonic capability 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, power utilization 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 grid have two main hazards to the electric energy meter: firstly, the metering precision of the electric energy meter is influenced, so that the metering error is increased; and secondly, electronic components in the electric energy meter are damaged, and the electric energy meter can be burned out seriously.
The influence of harmonic waves on the metering accuracy of the electric energy meter is specifically required in national standard GB/T17215.321-2008 static active electric energy meters (level 1 and level 2), related test equipment and schemes are more, and the following 3 schemes are briefly described:
ZL201320678823.0 discloses an electric energy meter harmonic test device, and a specific power supply and current harmonic generator generates alternating voltage and current, higher harmonic, direct current even harmonic, subharmonic and odd harmonic, supplies the alternating voltage and the current to a tested meter and a standard meter, calculates the error of the tested meter through the electric energy metering difference of the tested meter and the standard meter, compares the error with the error under a sine wave power supply, and tests out the error influence quantity.
ZL 201710852117.6 discloses a DC and even harmonic test system and method for an electric energy meter, wherein a voltage waveform generator outputs voltage waveforms required by test, the voltage waveforms are respectively connected with voltage ports of a standard calibrator and a to-be-detected meter through a voltage transformer VT2, and the voltage port of the standard calibrator is connected with the voltage port of the to-be-detected meter in parallel; the current waveform generator outputs a current waveform required by the test and is respectively connected with current ports of the standard calibrator and the meter to be tested, and a current port of the standard calibrator is connected with a current port of the meter to be tested in series; the test signal passes through the detected meter and the standard calibrator simultaneously, and the standard calibrator samples the current by adopting a precise sampling resistor, so that the metering accuracy of the standard calibrator under the influence of direct current and even harmonic waves is ensured, and load matching is not required.
ZL 201210530225.9 discloses a method for generating harmonic signals and a harmonic signal generator, and particularly the harmonic signal generator generates harmonic signals based on a DSP chip and an FPGA chip. The DSP chip is used for acquiring an amplitude coefficient, an initial phase word and a frequency control word of a fundamental wave, the amplitude coefficient, the initial phase word and the frequency control word corresponding to each subharmonic and fundamental wave wavetable data and transmitting the fundamental wave wavetable 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 obtaining unit is used for generating each component fi (kts) of the harmonic signal according to the information obtained by the DSP chip; and the harmonic addition unit is used for adding the components of the harmonic signal generated by the harmonic signal component acquisition unit to generate a harmonic signal.
However, the existing technology and equipment can only test the influence of the harmonic waves on the metering precision of the electric energy meter, and cannot test and evaluate the damage of the harmonic waves to the electric energy meter.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a method and an apparatus for testing harmonic-resistant capability of an electric energy meter, so as to evaluate the harmonic-resistant capability of the electric energy meter.
One of the purposes of the invention is realized by the technical scheme, and the method for testing the harmonic resistance of the electric energy meter comprises the following steps:
performing signal synthesis according to a received detection mode preset by a controller and a harmonic parameter to obtain a detection signal;
testing the tested electric energy meter through the detection signal;
and acquiring an output current curve of the tested electric energy meter according to the test result, and determining the anti-harmonic performance of the electric energy meter based on the output current curve.
Optionally, the signal synthesis is performed according to the received detection mode and the harmonic parameter preset by the controller, and includes:
and superposing the harmonic signal to the fundamental wave signal according to the received detection mode and harmonic parameters preset by the controller so as to synthesize the signal.
Optionally, superimposing the harmonic signal to the fundamental wave signal according to the received detection mode and the harmonic parameter preset by the controller, includes:
if the harmonic signal is a frequency sweep harmonic, the frequency sweep harmonic corresponds to a frequency sweep mode, and the harmonic signal is superposed into the fundamental wave signal according to the received initial frequency, end frequency, frequency interval, frequency sweep interval time and fixed amplitude preset by the controller;
and if the harmonic signal is a scanning harmonic wave, the scanning harmonic wave corresponds to a scanning mode, and the harmonic signal is superposed into the fundamental wave signal according to a starting amplitude, an ending amplitude, an amplitude interval, scanning interval time and fixed frequency preset by the received controller.
Optionally, the testing the electrical energy meter to be tested through the detection signal includes:
for the sweep frequency mode, adjusting the frequency of sweep frequency harmonics according to the fixed amplitude and the starting frequency according to the sweep frequency interval time and the frequency interval to test the tested electric energy meter;
and for the amplitude scanning mode, adjusting the amplitude of amplitude scanning harmonic waves according to the fixed frequency and the initial amplitude and the amplitude interval to test the tested electric energy meter.
Optionally, obtaining an output current curve of the measured electric energy meter according to the test result, and determining the anti-harmonic performance of the electric energy meter based on the output current curve, includes:
for the sweep frequency mode, acquiring an output current curve and a harmonic frequency curve of the measured electric energy meter, and determining the anti-harmonic performance of the electric energy meter according to the maximum current value and the corresponding harmonic frequency;
and for the amplitude scanning mode, acquiring an output current curve and a harmonic amplitude curve of the measured electric energy meter, and determining the anti-harmonic performance of the electric energy meter according to the zero current and the corresponding harmonic amplitude.
The second purpose of the invention is realized by the technical scheme, and the device for testing the harmonic resistance of the electric energy meter comprises:
the program-controlled harmonic source is used for carrying out signal synthesis according to a received detection mode preset by the controller and harmonic parameters so as to obtain a detection signal;
the test unit is used for testing the tested electric energy meter through the detection signal;
and the controller is used for acquiring an output current curve of the tested electric energy meter according to the test result and determining the anti-harmonic performance of the electric energy meter based on the output current curve.
Optionally, the program-controlled harmonic source includes:
and the signal synthesis module is used for superposing the harmonic signal to the fundamental wave signal according to the received detection mode and the harmonic parameter preset by the controller so as to synthesize the signal.
Optionally, the signal synthesizing 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 superposed into the fundamental wave signal according to the received initial frequency, end frequency, frequency interval, frequency sweep interval time and fixed amplitude preset by the controller;
and if the harmonic signal is a scanning harmonic wave, the scanning harmonic wave corresponds to a scanning mode, and the harmonic signal is superposed into the fundamental wave signal according to a starting amplitude, an ending amplitude, an amplitude interval, scanning interval time and fixed frequency preset by the received controller.
Optionally, the test unit is further configured to:
for the sweep frequency mode, adjusting the frequency of sweep frequency harmonics according to the fixed amplitude and the starting frequency according to the sweep frequency interval time and the frequency interval to test the tested electric energy meter;
and for the amplitude scanning mode, adjusting the amplitude of amplitude scanning harmonic waves according to the fixed frequency and the initial amplitude and the amplitude interval to test the tested electric energy meter.
Optionally, the controller is further configured to:
for the sweep frequency mode, acquiring an output current curve and a harmonic frequency curve of the measured electric energy meter, and determining the anti-harmonic performance of the electric energy meter according to the maximum current value and the corresponding harmonic frequency;
and for the amplitude scanning mode, acquiring an output current curve and a harmonic amplitude curve of the measured electric energy meter, 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 carries out signal synthesis according to a received detection mode and harmonic parameters preset by a controller; testing the tested electric energy meter through the detection signal; and acquiring an output current curve of the tested electric energy meter according to the test result, and determining the anti-harmonic performance of the electric energy meter based on the output current curve, thereby realizing the evaluation of the anti-harmonic capability of the electric energy meter.
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 invention are illustrated as follows:
FIG. 1 is a flow chart of a first embodiment of the present invention;
FIG. 2 is a flow chart of a frequency sweep harmonic implementation according to a first embodiment of the present invention;
FIG. 3 is a flowchart illustrating amplitude-sweeping harmonic implementation according to a first embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an apparatus according to a second embodiment of the present invention;
FIG. 5 is a schematic diagram of a second embodiment of the present invention for controlling a harmonic source;
FIG. 6 is a schematic diagram of signal synthesis according to a second embodiment of the present invention;
FIG. 7 is a diagram illustrating 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;
FIGS. 9-10 illustrate the device testing process according to the second embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples.
Example one
A first embodiment of the present invention provides a method for testing an anti-harmonic capability of an electric energy meter, as shown in fig. 1, including the following steps:
s101, synthesizing signals according to a received detection mode preset by a controller and harmonic parameters to obtain detection signals;
s102, testing the tested electric energy meter through the detection signal;
s103, obtaining an output current curve of the tested electric energy meter according to the test result, and determining the anti-harmonic performance of the electric energy meter based on the output current curve.
The method carries out signal synthesis according to a received detection mode and harmonic parameters preset by a controller; testing the tested electric energy meter through the detection signal; and acquiring an output current curve of the tested electric energy meter according to the test result, and determining the anti-harmonic performance of the electric energy meter based on the output current curve, thereby realizing the evaluation of the anti-harmonic capability of the electric energy meter.
Optionally, the signal synthesis is performed according to the received detection mode and the harmonic parameter preset by the controller, and includes:
and superposing the harmonic signal to the fundamental wave signal according to the received detection mode and harmonic parameters preset by the controller so as to synthesize the signal.
Specifically, in this embodiment, signal synthesis may be completed by controlling a harmonic signal generator and a fundamental wave signal generator, the harmonic signal generator outputs a corresponding harmonic frequency and a corresponding harmonic amplitude, the fundamental wave signal generator outputs a 50Hz sine wave signal, the fundamental wave signal and the harmonic signal are synthesized by a signal, a harmonic is superimposed on the fundamental wave signal, and after signal synthesis, power amplification may be performed on the signal, so as to improve the output power of the signal.
Optionally, superimposing the harmonic signal to the fundamental wave signal according to the received detection mode and the harmonic parameter preset by the controller, includes:
if the harmonic signal is a frequency sweep harmonic, the frequency sweep harmonic corresponds to a frequency sweep mode, and the harmonic signal is superposed into the fundamental wave signal according to the received initial frequency, end frequency, frequency interval, frequency sweep interval time and fixed amplitude preset by the controller;
and if the harmonic signal is a scanning harmonic wave, the scanning harmonic wave corresponds to a scanning mode, and the harmonic signal is superposed into the fundamental wave signal according to a starting amplitude, an ending amplitude, an amplitude interval, scanning interval time and fixed frequency preset by the received controller.
Specifically, in this embodiment, the harmonic signal includes a sweep frequency harmonic and a sweep frequency 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, the harmonic parameters of the sweep frequency harmonic include a start amplitude, an end amplitude, an amplitude interval, a sweep interval time, and a fixed frequency, and the corresponding harmonic signal is superimposed on the 50Hz sinusoidal fundamental wave signal output by the fundamental wave signal generator according to the harmonic parameters.
Optionally, the testing the electrical energy meter to be tested through the detection signal includes:
for the sweep frequency mode, adjusting the frequency of sweep frequency harmonics according to the fixed amplitude and the starting frequency according to the sweep frequency interval time and the frequency interval to test the tested electric energy meter;
and for the amplitude scanning mode, adjusting the amplitude of amplitude scanning harmonic waves according to the fixed frequency and the initial amplitude and the amplitude interval to test the tested electric energy meter.
Specifically, as shown in fig. 2, for the frequency sweep mode, the frequency interval is increased according to the frequency sweep interval time, that is, the fixed delay, on the basis of the start frequency according to the fixed amplitude and the start frequency, and each frequency sweep interval time is increased by one frequency interval until the final harmonic frequency is greater than or equal to the end frequency, and the measured electric energy meter is tested in the process of adjusting the frequency.
For the sweep mode, as shown in fig. 3, the sweep interval time is increased according to the fixed frequency and the initial amplitude, that is, the fixed delay is increased on the basis of the initial amplitude according to the amplitude interval, the amplitude interval is increased once per sweep interval time until the final harmonic amplitude is greater than or equal to the final amplitude, and the measured electric energy meter is tested in the process of adjusting the amplitude.
Optionally, obtaining an output current curve of the measured electric energy meter according to the test result, and determining the anti-harmonic performance of the electric energy meter based on the output current curve, includes:
for the sweep frequency mode, acquiring an output current curve and a harmonic frequency curve of the measured electric energy meter, and determining the anti-harmonic performance of the electric energy meter according to the maximum current value and the corresponding harmonic frequency;
and for the amplitude scanning mode, acquiring an output current curve and a harmonic amplitude curve of the measured electric energy meter, and determining the anti-harmonic performance of the electric energy meter according to the zero current and the corresponding harmonic amplitude.
Specifically, the acquisition of the output current curve and the harmonic frequency curve of the measured electric energy meter and the acquisition of the output current curve and the harmonic amplitude curve of the measured electric energy meter can be completed through the current monitoring unit, the controller realizes the current detection of the measured electric energy meter through the current monitoring unit, for the sweep frequency mode, the anti-harmonic performance of the electric energy meter is determined according to the current maximum value and the corresponding harmonic frequency, and for the sweep frequency mode, the anti-harmonic performance of the electric energy meter is determined according to the current zero and the corresponding harmonic amplitude.
The method can test the most sensitive harmonic frequency of the electric energy meter, can evaluate the bearing capacity of the electric energy meter under the most sensitive harmonic, and finally realizes the evaluation of the anti-harmonic capacity of the electric energy meter.
Another object of the present invention is achieved by the above technical solution, in which the device for testing the anti-harmonic capability of an electric energy meter, as shown in fig. 4, includes:
the program-controlled harmonic source is used for carrying out signal synthesis according to a received detection mode preset by the controller and harmonic parameters so as to obtain a detection signal;
the test unit is used for testing the tested electric energy meter through the detection signal;
and the controller is used for acquiring an output current curve of the tested electric energy meter 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, obtaining an output current curve of the electrical energy meter to be tested according to the test result may be accomplished by disposing the current detection unit between the program-controlled harmonic source and the electrical energy meter to be tested, and the controller may obtain the output current curve of the electrical energy meter to be tested by receiving a signal of the current detection unit.
The invention carries out signal synthesis according to the received detection mode and harmonic parameters preset by the controller; testing the tested electric energy meter through the detection signal; and acquiring an output current curve of the tested electric energy meter according to the test result, and determining the anti-harmonic performance of the electric energy meter based on the output current curve, thereby realizing the evaluation of the anti-harmonic capability of the electric energy meter.
Optionally, the program-controlled harmonic source includes:
and the signal synthesis module is used for superposing the harmonic signal to the fundamental wave signal according to the received detection mode and the harmonic parameter preset by the 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 signal generator, a signal synthesis module and a power amplifier, the single chip microcomputer controls the fundamental wave signal generator and the harmonic signal generator to perform signal synthesis through the signal synthesis module after receiving an instruction from the controller, and further, the single chip microcomputer controls the harmonic signal generator and the fundamental wave signal generator after receiving an instruction from the controller, 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 signals, the harmonic wave is superposed on the fundamental wave signal, and then the output power of the signal is improved through a power amplifier.
The fundamental wave signal generator and the harmonic 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 synthesis module may be implemented by using a differential operational amplifier. The program-controlled harmonic source can output various types of harmonic signals, mainly including sweep frequency harmonic signals, single harmonic frequency sweep amplitude signals and the like.
Optionally, the signal synthesizing 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 superposed into the fundamental wave signal according to the received initial frequency, end frequency, frequency interval, frequency sweep interval time and fixed amplitude preset by the controller;
and if the harmonic signal is a scanning harmonic wave, the scanning harmonic wave corresponds to a scanning mode, and the harmonic signal is superposed into the fundamental wave signal according to a starting amplitude, an ending amplitude, an amplitude interval, scanning interval time and fixed frequency preset by the received controller.
Specifically, in this embodiment, the harmonic signal includes a sweep frequency harmonic and a sweep frequency 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, the harmonic parameters of the sweep frequency harmonic include a start amplitude, an end amplitude, an amplitude interval, a sweep interval time, and a fixed frequency, and the corresponding harmonic signal is superimposed on the 50Hz sinusoidal fundamental wave signal output by the fundamental wave signal generator according to the harmonic parameters.
Optionally, the test unit is further configured to:
for the sweep frequency mode, adjusting the frequency of sweep frequency harmonics according to the fixed amplitude and the starting frequency according to the sweep frequency interval time and the frequency interval to test the tested electric energy meter;
and for the amplitude scanning mode, adjusting the amplitude of amplitude scanning harmonic waves according to the fixed frequency and the initial amplitude and the amplitude interval to test the tested electric energy meter.
Specifically, for the frequency sweeping mode, frequency intervals are increased on the basis of the initial frequency according to fixed amplitude and the initial frequency and frequency sweeping interval time, namely fixed delay, each frequency sweeping interval time is increased by one frequency interval until the final harmonic frequency is larger 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 frequency sweeping mode, increasing according to fixed frequency and initial amplitude and amplitude interval time, namely fixed delay on the basis of the initial amplitude and amplitude interval, increasing amplitude interval once in each amplitude sweeping interval time until the final harmonic amplitude is larger than or equal to the final 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, acquiring an output current curve and a harmonic frequency curve of the measured electric energy meter, and determining the anti-harmonic performance of the electric energy meter according to the maximum current value and the corresponding harmonic frequency;
and for the amplitude scanning mode, acquiring an output current curve and a harmonic amplitude curve of the measured electric energy meter, 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, obtaining an output current curve of the measured electric energy meter according to the test result can be accomplished by arranging a current detection unit between the program-controlled harmonic source and the measured electric energy meter through 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 connected in sequence, and more specifically, as shown in fig. 8, the current conversion voltage is mainly realized through a resistor R7; after passing through the resistor R7, the current is converted into a corresponding voltage signal. 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; the capacitor C1 integrates the dc voltage. The ADC mainly converts an analog voltage signal into a digital signal.
The controller can be a PC, a notebook computer and the like, 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 a 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; plots of current and harmonic frequency are shown.
As shown in fig. 9-10, in a specific embodiment, the output curve of the electrical energy meter to be tested in the sweep mode and the corresponding harmonic curve can be obtained by setting corresponding harmonic parameters on the PC, for the sweep mode, the anti-harmonic performance of the electrical energy meter is determined according to the current maximum value and the corresponding harmonic frequency, and for the sweep mode, the anti-harmonic performance of the electrical energy meter is determined according to the current zero and the corresponding harmonic amplitude.
The device of the invention has the following advantages:
the harmonic signal generator and the fundamental wave generator of the testing device adopt independent direct digital frequency synthesizers (DDS), so that the harmonic waves can be controlled independently;
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 test device can output a single harmonic frequency amplitude sweeping signal;
the testing device can visually display the sensitivity of the electric energy meter to different harmonic frequencies;
according to the test method, the most sensitive harmonic frequency of the electric energy meter is found out through the relation between the sweep frequency harmonic and the current magnitude, then the most sensitive harmonic frequency is fixed, a sweep amplitude signal is output, and the maximum harmonic amplitude which can be borne by the electric energy meter can be effectively evaluated.
As will be appreciated by one skilled in the art, 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered thereby.
Claims (10)
1. A method for testing anti-harmonic capability of an electric energy meter is characterized by comprising the following steps:
performing signal synthesis according to a received detection mode preset by a controller and a harmonic parameter to obtain a detection signal;
testing the tested electric energy meter through the detection signal;
and acquiring an output current curve of the tested electric energy meter according to the test result, and determining the anti-harmonic performance of the electric energy meter based on the output current curve.
2. The method for testing the harmonic resistance of the electric energy meter according to claim 1, wherein the signal synthesis is performed according to the received detection mode and harmonic parameters preset by the controller, and comprises the following steps:
and superposing the harmonic signal to the fundamental wave signal according to the received detection mode and harmonic parameters preset by the controller so as to synthesize the signal.
3. The method for testing the harmonic resistance of the electric energy meter according to claim 2, wherein the step of superimposing the harmonic signal into the fundamental signal according to the received detection mode and harmonic parameters preset by the controller comprises the following steps:
if the harmonic signal is a frequency sweep harmonic, the frequency sweep harmonic corresponds to a frequency sweep mode, and the harmonic signal is superposed into the fundamental wave signal according to the received initial frequency, end frequency, frequency interval, frequency sweep interval time and fixed amplitude preset by the controller;
and if the harmonic signal is a scanning harmonic wave, the scanning harmonic wave corresponds to a scanning mode, and the harmonic signal is superposed into the fundamental wave signal according to a starting amplitude, an ending amplitude, an amplitude interval, scanning interval time and fixed frequency preset by the received controller.
4. The method for testing the harmonic resistance of the electric energy meter according to claim 3, wherein the step of testing the electric energy meter to be tested through the detection signal comprises the following steps:
for the sweep frequency mode, adjusting the frequency of sweep frequency harmonics according to the fixed amplitude and the starting frequency according to the sweep frequency interval time and the frequency interval to test the tested electric energy meter;
and for the amplitude scanning mode, adjusting the amplitude of amplitude scanning harmonic waves according to the fixed frequency and the initial amplitude and the amplitude interval to test the tested electric energy meter.
5. The method for testing the harmonic resistance of the electric energy meter according to claim 4, wherein an output current curve of the tested electric energy meter is obtained according to the test result, and the harmonic resistance of the electric energy meter is determined based on the output current curve, and the method comprises the following steps:
for the sweep frequency mode, acquiring an output current curve and a harmonic frequency curve of the measured electric energy meter, and determining the anti-harmonic performance of the electric energy meter according to the maximum current value and the corresponding harmonic frequency;
and for the amplitude scanning mode, acquiring an output current curve and a harmonic amplitude curve of the measured electric energy meter, and determining the anti-harmonic performance of the electric energy meter according to the zero current and the corresponding harmonic amplitude.
6. A testing device for harmonic resistance of an electric energy meter is characterized by comprising:
the program-controlled harmonic source is used for carrying out signal synthesis according to a received detection mode preset by the controller and harmonic parameters so as to obtain a detection signal;
the test unit is used for testing the tested electric energy meter through the detection signal;
and the controller is used for acquiring an output current curve of the tested electric energy meter according to the test result and determining the anti-harmonic performance of the electric energy meter based on the output current curve.
7. The apparatus for testing harmonic rejection capability of an electric energy meter according to claim 6, wherein said program-controlled harmonic source comprises:
and the signal synthesis module is used for superposing the harmonic signal to the fundamental wave signal according to the received detection mode and the harmonic parameter preset by the controller so as to synthesize the signal.
8. The apparatus for testing harmonic rejection capability of an electric energy meter according to claim 7, wherein said signal synthesizing 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 superposed into the fundamental wave signal according to the received initial frequency, end frequency, frequency interval, frequency sweep interval time and fixed amplitude preset by the controller;
and if the harmonic signal is a scanning harmonic wave, the scanning harmonic wave corresponds to a scanning mode, and the harmonic signal is superposed into the fundamental wave signal according to a starting amplitude, an ending amplitude, an amplitude interval, scanning interval time and fixed frequency preset by the received controller.
9. The apparatus for testing harmonic rejection capability of an electrical energy meter according to claim 8, wherein said test unit is further configured to:
for the sweep frequency mode, adjusting the frequency of sweep frequency harmonics according to the fixed amplitude and the starting frequency according to the sweep frequency interval time and the frequency interval to test the tested electric energy meter;
and for the amplitude scanning mode, adjusting the amplitude of amplitude scanning harmonic waves according to the fixed frequency and the initial amplitude and the amplitude interval to test the tested electric energy meter.
10. The apparatus for testing harmonic rejection capability of an electrical energy meter according to claim 9, wherein said controller is further configured to:
for the sweep frequency mode, acquiring an output current curve and a harmonic frequency curve of the measured electric energy meter, and determining the anti-harmonic performance of the electric energy meter according to the maximum current value and the corresponding harmonic frequency;
and for the amplitude scanning mode, acquiring an output current curve and a harmonic amplitude curve of the measured electric energy meter, and determining the anti-harmonic performance of the electric energy meter according to the zero current and the corresponding harmonic amplitude.
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