CN202018504U - Electric energy quality analyzer detection system - Google Patents
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Abstract
The present utility model provides an electric energy quality analyzer detection system which comprises a harmonic wave detection device, a GPIB card and a standard source generator. The standard source generator comprises a first output device which is connected with a detected electric energy quality analyzer and used for outputting harmonic wave signals of modulating h harmonic waves by superposing fundamental waves with rectangular waves to the detected electric energy quality analyzer. The harmonic wave detection device comprises a measurement signal receiving device for receiving measured values output by the detected electric energy quality analyzer through a serial port bus or an LAN bus. A measurement result output device is connected with the measurement signal receiving device and used for outputting measurement result information of the detected electric energy quality analyzer according to the measured values, standard values corresponding with the harmonic wave signals, and the measurement uncertainty. By adopting the detection system, a detection of the harmonic wave measurement continuity of the electric energy quality analyzer can be realized, the detection time is short, and the measurement accuracy of the electric energy quality analyzer can be guaranteed.
Description
Technical field
The utility model particularly about harmonic measure technology in the Power Quality Detection, is a kind of power quality analyzer detection system about the Power Quality Detection technology concretely.
Background technology
Along with highlighting of power quality problem, power quality analyzer has obtained using widely, and International Electrotechnical Commission (IEC) and national standard have been put into effect the relevant criterion of standard power quality analyzer performance index.Therefore, according to relevant criterion the technology that power quality analyzer detects is also occurred in succession.Frequent operation in the electric system and non-linear load, brought to electric system and to have become harmonic wave when a large amount of, and because the diversity and the polytrope of harmonic source, the harmonic wave size in the electrical network not only changes with the harmonic source operating condition, and changes with the change of power system operating mode.Therefore, need the continuity of the harmonic measure of the power quality analyzer of present widespread use be detected.
In the prior art, the system that the harmonic measure continuity of power quality analyzer is detected mainly comprises following two kinds:
(1), based on the power quality analyzer detection system of Labview
Based on the structured flowchart of the power quality analyzer detection system of Labview as shown in Figure 1, use Labview pattern development environment, can finish the calibration operation of the main every technical indicator of the quality of power supply such as frequency departure, alternating voltage effective value deviation, flickering value and harmonic wave (harmonic wave) containing ratio of power quality analysis surveying instrument.Produce harmonic signal, sinewave modulation signal or square-wave modulation signal by the virtual instrument test platform by GPIB card control AWG (Arbitrary Waveform Generator), be amplified to target voltage, current value through voltage, current power amplifier, analyze from the amplifier out acquired signal by data collecting card then, calculate humorous wave amplitude and magnitude of a voltage fluctuation, the situation of change in supervisory signal source.Subsequently, output signal and measurement standard table are analyzed, the waveform parameter in the software program are revised, thereby make the signal that is loaded on the equipment under test reach a certain aimed at precision requirement according to analysis result.
But, only realized calibration based on the quality of power supply check system of Labview, and waveform parameter needing to revise to quality of power supply basic index, error effect is bigger.
(2), based on the power quality analyzer detection system of virtual instrument technique
Based on the structured flowchart of the power quality analyzer detection system of virtual instrument technique as shown in Figure 2, adopt the Labview programming to realize, carry by VISA built-in function assembly, program-controlled standard of instruments order, instrument and drive and required hardware interface card and data bus are finished data communication between PC and each pertinent instruments.The attainable function of system comprises the inventory analysis of standard source setting, instrument control and measurement data.
Realize the detection of part power quality index based on the power quality analyzer detection system of virtual instrument technique, still, do not had the detection that requires about the harmonic measure aggregation algorithms in the standard.
The utility model content
The utility model embodiment provides a kind of power quality analyzer detection system, in order to solve the successional problem of harmonic measure that existing detection system can't detect power quality analyzer.
The purpose of this utility model is, a kind of power quality analyzer detection system is provided, and described system comprises: harmonic wave pick-up unit, GPIB card and standard source generator; Described harmonic wave pick-up unit is connected with described standard source generator by described GPIB card; Described harmonic wave pick-up unit is connected with tested power quality analyzer by serial bus or LAN bus; Described standard source generator is connected with tested power quality analyzer; Described standard source generator comprises: first output unit, be connected with described tested power quality analyzer, and the harmonic signal of output first-harmonic superimpose rectangles ripple modulation h subharmonic is to tested power quality analyzer; Described harmonic wave pick-up unit comprises: the measuring-signal receiving trap receives the measured value that tested power quality analyzer is exported by serial bus or LAN bus; The measurement result output unit is connected with described measuring-signal receiving trap, according to the standard value of described measured value, described harmonic signal correspondence, the testing result information that uncertainty of measurement is exported tested power quality analyzer.
Preferably, described standard source generator also comprises: second output unit, be connected with described tested power quality analyzer, and the harmonic signal of output first-harmonic stack h subharmonic is to tested power quality analyzer.
Preferably, described harmonic wave pick-up unit also comprises: the average measurement value receiving trap, be connected with described measurement result output unit, receive described testing result information and be the mean value U1 of the greatest measurement that tested power quality analyzer that noncontinuity measures exports in some cycles; The first standard information output unit is connected with described average measurement value receiving trap, exports the national standard testing result information of tested power quality analyzer according to described mean value U1 and the corresponding uncertainty of measurement that prestores.
Preferably, described harmonic wave pick-up unit also comprises: the big value receiving trap of probability, be connected with described measurement result output unit, receive described testing result and be the big value U2 of probability of the measured value that tested power quality analyzer that noncontinuity measures exports in some cycles; The second standard information output unit is connected with the big value receiving trap of described probability, exports the national standard testing result information of tested power quality analyzer according to the big value U2 of described probability and the corresponding uncertainty of measurement that prestores.
The beneficial effects of the utility model are, realized whether power quality analyzer is satisfied the detection that IEC and GB standard are carried out, realized the successional detection of the harmonic measure of power quality analyzer, and detection time is short, has guaranteed the measurement accuracy of power quality analyzer.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is based on the structured flowchart of the power quality analyzer detection system of Labview in the prior art;
Fig. 2 is based on the structured flowchart of the power quality analyzer detection system of virtual instrument technique in the prior art;
Fig. 3 is the structured flowchart of a kind of power quality analyzer detection system of the utility model embodiment;
Fig. 4 is the structured flowchart of the another kind of power quality analyzer detection system of the utility model embodiment;
Fig. 5 is the oscillogram of rectangular modulation ripple;
The oscillogram that Fig. 6 modulates the harmonic signal of 5 subharmonic for first-harmonic superimpose rectangles ripple;
Fig. 7 is the modulating wave translation synoptic diagram of the utility model embodiment;
Fig. 8 is the workflow diagram of the detection power quality analyzer of embodiment one of the present utility model;
Fig. 9 is the workflow diagram of the detection power quality analyzer of embodiment two of the present utility model;
Figure 10 is the workflow diagram of the detection power quality analyzer of embodiment three of the present utility model.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
In order better to describe particular content of the present utility model, at first introduce the harmonic measure in the electric system below.Based on the harmonic measure of Fourier transform be current application at most, the most a kind of method, carry out the transition to Fast Fourier Transform (FFT) by discrete Fourier transformation.Consider the precision and the stability of Harmonics Calculation, regulation is with 10 cycle FFT calculating, carries out the time interval on this basis and be 3 seconds, 30 seconds, 10 minutes, the gathering of 2 hour datas.And this continuous sampling data volume is very big, calculated amount is also big, storage and computing velocity to the power quality analyzer device require than higher, and therefore existing part power quality analyzer does not adopt continuous coverage, only gets the root-mean-square value of the inferior measurement of m in 3 seconds (m＜15).Such power quality analyzer is against regulation, and such power quality analyzer is correct for the slow harmonic measure value of load variations, and still for the harmonic wave of some special variation, measured value is incorrect, has reduced precision of test result.Standard GB/T 17626.7-2008 is when clearly the power quality analyzer of regulation all size adopts Fourier transform to carry out harmonic measure, and its sampling time window length (being spectrum analysis length) is 10 cycles.The each measurement result of surveying instrument of regulation harmonic wave can be the mean value of institute's measured value in 3 seconds in GB/T 14549-1993 " the quality of power supply utility network harmonic wave " standard on this basis, adopts following formula to calculate:
In the formula: Uhk---the root-mean-square valve of the h subharmonic that the k time records in the 3s;
M---get evenly spaced measurement number of times in the 3s, m 〉=6.
When the power quality analyzer that IEC 61000-4-30 standard clearly stipulates to meet the A level carried out harmonic measure, the computing method of m subharmonic content value were in the 3s: 15 root-mean-square values of 10 cycle FFT continuously; The method for congregating of m subharmonic content value is the statistics root-mean-square value of 10 3s values in the 30s.A kind of power quality analyzer detection system that the utility model provides is exactly whether the spectrum measurement that detects power quality analyzer satisfies GB and require m 〉=6, and whether satisfies the IEC standard, i.e. seamless sampling on 15 time windows.
The power quality analyzer that detects in the utility model satisfies among the GB/T 17626.7-2008 " measurement of harmonic wave, humorous ripple and surveying instrument guide rule " that permissible error about harmonic measure requires and spectrum analysis length is the requirement of 10 cycles.
Fig. 3 is the structured flowchart of a kind of power quality analyzer detection system of providing of the utility model, and as shown in Figure 3, this system mainly comprises: harmonic wave pick-up unit 10, GPIB card 20 and standard source generator 30;
Described harmonic wave pick-up unit 10 is connected with described standard source generator 30 by described GPIB card 20, and described harmonic wave pick-up unit 10 is connected with tested power quality analyzer 40 by serial bus or LAN bus;
Described standard source generator 30 is connected with tested power quality analyzer 40;
Described standard source generator 30 comprises: first output unit 301, be connected with described tested power quality analyzer 40, the harmonic signal of output first-harmonic superimpose rectangles ripple modulation h subharmonic is to tested power quality analyzer 40, wherein, h is an overtone order, is positive integer.
Described harmonic wave pick-up unit 10 comprises:
Measuring-signal receiving trap 101 receives the measured value that tested power quality analyzer 40 is exported by serial bus or LAN bus;
Measurement result output unit 102 is connected with described measuring-signal receiving trap 101, exports the testing result information of tested power quality analyzer 40 according to described measured value, the standard value of described harmonic signal correspondence, uncertainty of measurement.Described testing result information comprises: the harmonic measure of tested power quality analyzer is that continuity is measured or the harmonic measure of tested power quality analyzer is that noncontinuity is measured.
Fig. 4 is the structured flowchart of the another kind of power quality analyzer detection system that provides of the utility model, and as shown in Figure 4, described harmonic wave pick-up unit 10 also comprises except measuring-signal receiving trap 101, measurement result output unit 102:
Average measurement value receiving trap 103 is connected with described measurement result output unit 102, receives described testing result information and be the mean value U1 of the greatest measurement that tested power quality analyzer 40 that noncontinuity measures exports in some cycles;
The first standard information output unit 104 is connected with described average measurement value receiving trap 103, exports the national standard testing result information of tested power quality analyzer 40 according to described mean value U1 and the corresponding uncertainty of measurement that prestores.
The big value receiving trap 105 of probability is connected with described measurement result output unit 102, receives described testing result and be the big value U2 of probability of the measured value that tested power quality analyzer that noncontinuity measures exports in some cycles;
The second standard information output unit 106 is connected with the big value receiving trap 105 of described probability, exports the national standard testing result information of tested power quality analyzer 40 according to the big value U2 of described probability and the corresponding uncertainty of measurement that prestores.
Described standard source generator 30 also comprises second output unit 302 except first output unit 301, be connected 40 with described tested power quality analyzer, and the harmonic signal of output first-harmonic stack h subharmonic is to tested power quality analyzer 40.
It is pointed out that the harmonic wave pick-up unit 10 described in the utility model includes but not limited to computing machine, PC.
Fig. 8 is the workflow diagram of the embodiment one of a kind of electric energy measurement analyser detection system of providing of the utility model, specifically introduces a kind of electric energy measurement analyser detection system of the present utility model below in conjunction with the content of embodiment one of the present utility model and Fig. 8.
S1-S2: described harmonic wave pick-up unit 10 sends output order by described GPIB card 20 to described standard source generator 30, and described output order is used to indicate described standard source generator 30 to send harmonic signal;
S3: the harmonic signal of described standard source generator 30 output first-harmonic superimpose rectangles ripple modulation h subharmonic is to tested power quality analyzer 40;
In this embodiment, adopt Fluke 6100A electric energy power standard source generator, this Fluke 6100A electric energy power standard source generator can produce sine wave modulation harmonic wave and square wave modulation harmonic wave.The parameter that can set has:
Depth of modulation: 0%～100% of nominal harmonic voltage;
Modulation waveform: rectangle or sine wave;
Dutycycle (when waveform is rectangle): 0.1%～99.99%;
Modulating frequency: 0.008Hz～30Hz.
In this embodiment, adopt square wave to modulate 5 subharmonic, depth of modulation 30%, modulating frequency 0.333Hz, dutycycle 6.67%, 5 subharmonic amplitude is 20% of a fundamental voltage amplitude.
Rectangular modulation ripple oscillogram as shown in Figure 5, the harmonic signal oscillogram of 5 square waves modulation of first-harmonic stack harmonic waves is as shown in Figure 6.
S4: described harmonic wave pick-up unit 10 receives the measured value of tested power quality analyzer 40 outputs by serial bus or LAN bus;
In this step, when detecting beginning, at first read the measured value of tested power quality analyzer in 1 hour.Uh measured value of every 30s output, wherein, Uh is harmonic content/%.
S5: whether the difference of judging the standard value that Uh is corresponding with described harmonic signal is within the harmonic measure uncertainty q1 of tested power quality analyzer scope, when being judged as when being, the harmonic measure that shows this power quality analyzer is a continuity, meet the IEC standard, otherwise, the harmonic measure that shows this power quality analyzer is a noncontinuity, execution in step S6.In embodiment one, the standard value of described harmonic signal correspondence is 15.09.
S6: further test: periodically approximate if the measured value of tested power quality analyzer in one hour presents, read the maximal value of n (n 〉=5) in the individual cycle, calculate peaked mean value U1 then, whether the difference of judging the harmonic measure uncertainty q1 that this mean value U1 is corresponding with tested power quality analyzer is within 16.6, when being judged as when being, show that current tested power quality analyzer meets national standard; Otherwise, show that current tested power quality analyzer does not meet national standard.
In other embodiment of the present utility model, step S5 also can carry out in the following way:
Read the tested power quality analyzer harmonic measure value in per 30 seconds (getting number percent) with respect to fundamental voltage, measuring in 0 to 15 minute that begins, whether the difference of judging the standard value that Uh is corresponding with described harmonic signal is within the harmonic measure uncertainty q1 of tested power quality analyzer scope, when being judged as not, then tested power quality analyzer non-continuous, do not meet the IEC standard, execution in step S6; Otherwise continue to measure, read the measured value of power quality analyzer tested in 1 hour, whether the difference of judging the standard value that Uh is corresponding with described harmonic signal is within the harmonic measure uncertainty q1 of tested power quality analyzer scope, when being judged as not, then tested power quality analyzer non-continuous does not meet the IEC standard, execution in step S6, otherwise tested power quality analyzer is continuous coverage, meets the IEC standard.
Introduce the detection principle of power quality analyzer detection system in the above embodiments below:
The square wave modulation duty cycle is certain, and high level lasting time is 10c in the phase weekly.When modulating frequency was 0.333Hz, the cycle was 1/0.333 second, and greater than measuring intervals of TIME 3 seconds, this made that in 1 hour continuous coverage process in per 3 second interval time, the high level position is in translation, and point-to-point speed is 10c/200s, about 3 minutes 18 seconds translation 10 cycles.As shown in Figure 7, Fig. 7 is modulating wave translation synoptic diagram (high level through 396 seconds move to the 3rd time window position).For get 15 continuous time window the root mean square of spectrum component as the situation of the output quantity of harmonic measure, per 30 seconds harmonic contents are the approximately constant value with unaffected, this moment, h subharmonic content was 15.09% ± q1.
And can present variation tendency for the power quality analyzer harmonic wave output valve of non-continuous, and when not sampling the value of high level time at interval fully, the output valve of power quality analyzer can be lower than standard value, and minimum is 14.0%+q1.(be the maximal value of standard source generator output this moment) when sampling modulating wave high level time section fully, h subharmonic content value is as shown in table 1 with the relation of measuring number of times m.
Table 1
| The m value/time | Harmonic content/% | The m value/time | Harmonic content/% | The m value/time | Harmonic content/% |
| 1 | 26.00 | 6 | 16.61 | 11 | 15.48 |
| 2 | 20.80 | 7 | 16.26 | 12 | 15.36 |
| 3 | 18.86 | 8 | 16.00 | 13 | 15.26 |
| 4 | 17.78 | 9 | 15.79 | 14 | 15.17 |
| 5 | 17.08 | 10 | 15.62 | 15 | 15.09 |
Harmonic content value in the table 1 is that measured value has unsteady through the result after the MATLAB emulation.
Need to prove: (1) is because the translation features of waveform makes that the output valve of standard source generator can be 14.0 to gradual change between the maximal value shown in the table 1.For above-mentioned setting waveform, the power quality analyzer of non-continuous output result can present cyclical variation, and the cycle that changes is relevant with measurement number of times m in the 3s, and m is big more, and the cycle is long more; (2) with the speed translation of 10c/200s, traveling through 150 cycles (promptly 3 seconds) needs 45 minutes, instrument clock frequency and influence regularly when considering actual measurement, and therefore, be 1 hour the observing time of choosing among this embodiment.
So, the foregoing description can detect whether continuous coverage and can judge whether tested power quality analyzer satisfies the GB requirement according to the big value of probability of power quality analyzer output in above-mentioned test of power quality analyzer, promptly whether is taken to 6 time windows less.
In addition, consider specific tested power quality analyzer in actual measurement, the power quality analyzer that smallest record is spaced apart 0.2s is continuous coverage certainly; Can reach at interval the power quality analyzer of 3s for smallest record, the modulating wave cycle can be set, the modulating wave high level is accelerated with respect to the position translational speed at the time interval place of every 3s, obviously shorten detection time.Principle is same as above, repeats no more herein.
In other embodiments of the present utility model, step S6 also can realize in the following way:
S6: further test: periodically approximate if the measured value of current power quality analyzer in one hour presents, read 95% the big value U2 of probability of measured value that n (n 〉=5) exports in the individual cycle;
Whether the difference of judging this mean value U2 and q1 when being judged as when being, then shows and measures number of times m 〉=6 in this power quality analyzer 3s within 16.6, satisfy the national standard requirement, otherwise this power quality analyzer does not satisfy the GB standard.
Fig. 9 is the workflow diagram of the embodiment two of a kind of electric energy measurement analyser detection system of providing of the utility model, specifically introduces a kind of electric energy measurement analyser detection system of the present utility model below in conjunction with the content of embodiment two of the present utility model and Fig. 9.
S1-S2: described harmonic wave pick-up unit 10 sends output order by described GPIB card 20 to described standard source generator 30, and described output order is used to indicate described standard source generator 30 to send harmonic signal;
S3: the C that the A of described standard source generator 30 output first-harmonic superimpose rectangles ripples modulation h subharmonic modulates harmonic signal and first-harmonic stack h subharmonic mutually mutually harmonic signal to tested power quality analyzer 40;
In this embodiment, adopt Fluke 6100A electric energy power standard source generator, this Fluke 6100A electric energy power standard source generator can produce sine wave modulation harmonic wave and square wave modulation harmonic wave.The parameter that can set has:
Depth of modulation: 0%～100% of nominal harmonic voltage;
Modulation waveform: rectangle or sine wave;
Dutycycle (when waveform is rectangle): 0.1%～99.99%;
Modulating frequency: 0.008Hz～30Hz.
In this embodiment, adopt square wave to modulate 5 subharmonic, depth of modulation 30%, modulating frequency 0.333Hz, dutycycle 6.67%, 5 subharmonic amplitude is 20% of a fundamental voltage amplitude.
Rectangular modulation ripple oscillogram as shown in Figure 5, the harmonic signal oscillogram of 5 square waves modulation of first-harmonic stack harmonic waves is as shown in Figure 6.
S4: described harmonic wave pick-up unit 10 receives the measured value of tested power quality analyzer 40 outputs by serial bus or LAN bus;
In this step, when detecting beginning, at first read the measured value of tested power quality analyzer in 1 hour.Every 30s exports one group of Uha, Uhc measured value, and wherein, Uha, Uhc are harmonic content/%.
S5: whether the difference of judging Uha and Uhc is within the duplicate measurements uncertainty q2 of tested power quality analyzer scope, when being judged as when being, the harmonic measure that shows this power quality analyzer is a continuity, meet the IEC standard, otherwise, the harmonic measure that shows this power quality analyzer is a noncontinuity, execution in step S6;
S6: further test: periodically approximate if the measured value of tested power quality analyzer in one hour presents, read the maximal value of n (n 〉=5) in the individual cycle, calculate peaked mean value U1 then, whether the difference of judging the duplicate measurements uncertainty q2 that this mean value U1 is corresponding with tested power quality analyzer is within 16.6, when being judged as when being, show that current tested power quality analyzer meets national standard; Otherwise, show that current tested power quality analyzer does not meet national standard.
In other embodiment of the present utility model, step S5 also can carry out in the following way:
Read the tested power quality analyzer harmonic measure value in per 30 seconds (getting number percent) with respect to fundamental voltage, measuring in 0 to 15 minute that begins, whether the difference of judging Uha and Uhc is within the q2 scope, when being judged as not, then tested power quality analyzer non-continuous, do not meet the IEC standard, execution in step S6; Otherwise continue to measure, read the measured value of power quality analyzer tested in 1 hour, whether the difference of judging Uha and Uhc is within the q2 scope, when being judged as not, then tested power quality analyzer non-continuous does not meet the IEC standard, execution in step S6, otherwise tested power quality analyzer is continuous coverage, meets the IEC standard.
In other embodiments of the present utility model, step S6 also can realize in the following way:
S6: further test: periodically approximate if the measured value of current power quality analyzer in one hour presents, read 95% the big value U2 of probability of measured value that n (n 〉=5) exports in the individual cycle;
Whether the difference of judging this mean value U2 and q2 when being judged as when being, then shows and measures number of times m 〉=6 in this power quality analyzer 3s within 16.6, satisfy the national standard requirement, otherwise this power quality analyzer does not satisfy the GB standard.
Need to prove: (1) is because the translation features of waveform makes that the output valve of standard source generator can be 14.0 to gradual change between the maximal value shown in the table 1.For above-mentioned setting waveform, the power quality analyzer of non-continuous output result can present cyclical variation, and the cycle that changes is relevant with measurement number of times m in the 3s, and m is big more, and the cycle is long more; (2) power quality analyzer of non-continuous is identical with standard value to the constant harmonic wave of effective value (harmonic wave that C sets mutually) measurement result, so the setting of C phase can be for reference; For example: approximately occurred maximal value a 16.6 ± q during m=6 in per 5～6 minutes.(3) with the speed translation of 10c/200s, traveling through 150 cycles (promptly 3 seconds) needs 45 minutes, instrument clock frequency and influence regularly when considering actual measurement, and therefore, be 1 hour the observing time of choosing among this embodiment.
Figure 10 is the workflow diagram of the embodiment three of a kind of electric energy measurement analyser detection system of providing of the utility model, specifically introduces a kind of electric energy measurement analyser detection system of the present utility model below in conjunction with the content of embodiment three of the present utility model and Figure 10.
S1-S2: described harmonic wave pick-up unit 10 sends output order by described GPIB card 20 to described standard source generator 30, and described output order is used to indicate described standard source generator 30 to send harmonic signal;
S3: the A of described standard source generator 30 output first-harmonic superimpose rectangles ripples modulation h subharmonic modulate mutually C that harmonic signal, B modulate harmonic signal and first-harmonic stack h subharmonic mutually mutually harmonic signal to tested power quality analyzer 40;
In this embodiment, adopt Fluke 6100A electric energy power standard source generator, this Fluke 6100A electric energy power standard source generator can produce sine wave modulation harmonic wave and square wave modulation harmonic wave.The parameter that can set has:
Depth of modulation: 0%～100% of nominal harmonic voltage;
Modulation waveform: rectangle or sine wave;
Dutycycle (when waveform is rectangle): 0.1%～99.99%;
Modulating frequency: 0.008Hz～30Hz.
In this embodiment, adopt square wave to modulate 5 subharmonic, depth of modulation 30%, modulating frequency 0.333Hz, dutycycle 6.67%, 5 subharmonic amplitude is 20% of a fundamental voltage amplitude.
Rectangular modulation ripple oscillogram as shown in Figure 5, the harmonic signal oscillogram of 5 square waves modulation of first-harmonic stack harmonic waves is as shown in Figure 6.
S4: described harmonic wave pick-up unit 10 receives the measured value of tested power quality analyzer 40 outputs by serial bus or LAN bus;
In this step, when detecting beginning, at first read the measured value of tested power quality analyzer in 1 hour.Every 30s exports one group of Uha, Uhb, Uhc measured value, and wherein, Uha, Uhb, Uhc are harmonic content/%.
S5: whether the difference of judging Uha, Uhb and Uhc is within the duplicate measurements uncertainty q2 of tested power quality analyzer scope, when being judged as when being, the harmonic measure that shows this power quality analyzer is a continuity, meet the IEC standard, otherwise, the harmonic measure that shows this power quality analyzer is a noncontinuity, execution in step S6;
S6: further test: periodically approximate if the measured value of tested power quality analyzer in one hour presents, read the maximal value of n (n 〉=5) in the individual cycle, calculate peaked mean value U1 then, whether the difference of judging the duplicate measurements uncertainty q2 that this mean value U1 is corresponding with tested power quality analyzer is within 16.6, when being judged as when being, show that current tested power quality analyzer meets national standard; Otherwise, show that current tested power quality analyzer does not meet national standard.
In other embodiment of the present utility model, step S5 also can carry out in the following way:
Read the tested power quality analyzer harmonic measure value in per 30 seconds (getting number percent) with respect to fundamental voltage, measuring in 0 to 15 minute that begins, whether the difference of judging Uha, Uhb and Uhc is within the q2 scope, when being judged as not, then tested power quality analyzer non-continuous, do not meet the IEC standard, execution in step S6; Otherwise continue to measure, read the measured value of power quality analyzer tested in 1 hour, whether the difference of judging Uha, Uhb and Uhc is within the q2 scope, when being judged as not, then tested power quality analyzer non-continuous does not meet the IEC standard, execution in step S6, otherwise tested power quality analyzer is continuous coverage, meets the IEC standard.
In other embodiments of the present utility model, step S6 also can realize in the following way:
S6: further test: periodically approximate if the measured value of current power quality analyzer in one hour presents, read 95% the big value U2 of probability of measured value that n (n 〉=5) exports in the individual cycle;
Whether the difference of judging this mean value U2 and q2 when being judged as when being, then shows and measures number of times m 〉=6 in this power quality analyzer 3s within 16.6, satisfy the national standard requirement, otherwise this power quality analyzer does not satisfy the GB standard.
Be presented in 20 ℃ ± 5 ℃ of environment temperatures below, under the condition of relative humidity≤80%, the power quality analyzer detection system that begins after 24 hours to provide with the utility model is provided detects power quality analyzer, in this embodiment, detected power quality analyzer is called tested power quality analyzer I and tested power quality analyzer II.The measurement number of times m of tested power quality analyzer I is 6.In this embodiment, PC sends output order by the GPIB card to the standard source generator, the standard source generator is according to the output order output detection signal, send to detected power quality analyzer, the experimental measurements of tested power quality analyzer I is as shown in table 2, and the experimental measurements of tested power quality analyzer II is as shown in table 3.
Table 2
Table 3
| Time | A phase harmonic content/% | B phase harmonic content/% | C phase harmonic content/% |
| 19.09.2010?10:12:30 | 15.083 | 15.075 | 15.105 |
| 19.09.2010?10:13:00 | 15.063 | 15.069 | 15.104 |
| 19.09.2010?10:13:30 | 15.054 | 15.052 | 15.104 |
| 19.09.2010?10:14:00 | 15.071 | 15.067 | 15.105 |
| 19.09.2010?10:14:30 | 15.074 | 15.074 | 15.105 |
| 19.09.2010?10:15:00 | 15.057 | 15.059 | 15.105 |
| 19.09.2010?10:15:30 | 15.057 | 15.053 | 15.104 |
| 19.09.2010?10:16:00 | 15.086 | 15.085 | 15.105 |
| 19.09.2010?10:16:30 | 15.054 | 15.056 | 15.104 |
| 19.09.2010?10:17:00 | 15.06 | 15.056 | 15.104 |
| 19.09.2010?10:17:30 | 15.075 | 15.072 | 15.104 |
| 19.09.2010?10:18:00 | 15.069 | 15.071 | 15.104 |
| 19.09.2010?10:18:30 | 15.052 | 15.054 | 15.105 |
| 19.09.2010?10:19:00 | 15.069 | 15.061 | 15.105 |
| 19.09.2010?10:19:30 | 15.077 | 15.081 | 15.104 |
| …… | …… | …… | …… |
By table 2, table 3 as can be known, the mutually every 30s harmonic measure of the A of tested power quality analyzer I value is variation tendency, and the big value of probability is in the 16.6%+q2 scope, institute thinks discontinuous measurement, do not meet the IEC standard, meet national standard, measuring number of times in the 3s time interval is 6 times.In 1 hour of tested power quality analyzer II each mutually value all in 15.09 ± q2 scope, basicly stable, be continuous coverage, meet the IEC standard, meet national standard.
A kind of power quality analyzer detection system of present embodiment, solved the successional problem of harmonic measure that detection system of the prior art can't detect power quality analyzer, realized whether power quality analyzer is satisfied the detection that IEC and GB standard are carried out, realized the successional detection of the harmonic measure of power quality analyzer, and detection time is short, has guaranteed the measurement accuracy of power quality analyzer.
Used specific embodiment in the utility model principle of the present utility model and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present utility model and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (4)
1. a power quality analyzer detection system is characterized in that, described system comprises: harmonic wave pick-up unit, general purpose interface bus GPIB card and standard source generator;
Described harmonic wave pick-up unit is connected with described standard source generator by described GPIB card;
Described harmonic wave pick-up unit is connected with tested power quality analyzer by serial bus or LAN bus;
Described standard source generator is connected with tested power quality analyzer;
Described standard source generator comprises:
First output unit is connected with described tested power quality analyzer, and the harmonic signal of output first-harmonic superimpose rectangles ripple modulation h subharmonic is to tested power quality analyzer;
Described harmonic wave pick-up unit comprises:
The measuring-signal receiving trap receives the measured value that tested power quality analyzer is exported by serial bus or LAN bus;
The measurement result output unit is connected with described measuring-signal receiving trap, according to the standard value of described measured value, described harmonic signal correspondence, the testing result information that uncertainty of measurement is exported tested power quality analyzer.
2. power quality analyzer detection system according to claim 1 is characterized in that, described standard source generator also comprises:
Second output unit is connected with described tested power quality analyzer, and the harmonic signal of output first-harmonic stack h subharmonic is to tested power quality analyzer.
3. power quality analyzer detection system according to claim 1 and 2 is characterized in that, described harmonic wave pick-up unit also comprises:
The average measurement value receiving trap is connected with described measurement result output unit, receives described testing result information and be the mean value U1 of the greatest measurement that tested power quality analyzer that noncontinuity measures exports in some cycles;
The first standard information output unit is connected with described average measurement value receiving trap, exports the national standard testing result information of tested power quality analyzer according to described mean value U1 and the corresponding uncertainty of measurement that prestores.
4. power quality analyzer detection system according to claim 1 and 2 is characterized in that, described harmonic wave pick-up unit also comprises:
The big value receiving trap of probability is connected with described measurement result output unit, receives described testing result and be the big value U2 of probability of the measured value that tested power quality analyzer that noncontinuity measures exports in some cycles;
The second standard information output unit is connected with the big value receiving trap of described probability, exports the national standard testing result information of tested power quality analyzer according to the big value U2 of described probability and the corresponding uncertainty of measurement that prestores.
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