CN101629995A - Detection method of phasor measurement unit PMU - Google Patents

Detection method of phasor measurement unit PMU Download PDF

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Publication number
CN101629995A
CN101629995A CN200910305475A CN200910305475A CN101629995A CN 101629995 A CN101629995 A CN 101629995A CN 200910305475 A CN200910305475 A CN 200910305475A CN 200910305475 A CN200910305475 A CN 200910305475A CN 101629995 A CN101629995 A CN 101629995A
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test
pmu
file
waveform
data
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CN200910305475A
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王健
李亚萍
张胜
贺春
任春梅
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XUCHANG KETOP ELECTRIC TESTING INSTITUTE
Central China Grid Co Ltd
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XUCHANG KETOP ELECTRIC TESTING INSTITUTE
Central China Grid Co Ltd
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Abstract

The invention relates to a detection method of a phasor measurement unit (PMU), which comprises the following steps: firstly, establishing various needed waveform library based on the test items, then establishing a circuit diagram with a PSCAD tool and adjusting each parameter according to the test demands to form various waveforms; when in test, selecting a corresponding .seq file or a waveform file of a COMTRADE format according to the test items; playing back the .seq file or COMTRADE file by using an Omicron relay protection testing device; when in playback of the .seq file, setting a waveform playback time in the 'GPS Set' to play back the waveform in a prescribed moment; executing data acquisition by using a PMU, and then delivering messages to main station simulation tool software through a communication protocol; reading the protocol message in virtue of the PMU synchronized phasor data analysis software, and converting and storing the message into the amplitude and phase data; performing frequency analysis for a static measurement precision test; and finding the optimal range of device measurement precision.

Description

The detection method of phasor measurement unit PMU
Technical field
The present invention relates to a kind of detection method of phasor measurement unit PMU, belong to technical field of power systems.
Background technology
Along with the continuous expansion of electrical network scale, alternating current-direct current between the regional power grid is interconnected and the raising of electrical network transmission capacity, stabilization of power grids problem becomes increasingly conspicuous.With regard to Central China Power Grid, " 7.1 " accident of " 10.29 " in 2005 and 2006 has all proved the importance of power grid operation and pressing for electricity net safety stable control.
In order to realize the operation of power networks real time monitoring, to the identification and the analysis of stabilization of power grids state and low frequency oscillations, phasor measurement unit PMU just seems particularly important in the application of electric system.
In PMU device operational process, by state's Intranet being economized operation or being investigated in system that builds and manufacturing firm, there are a series of problems such as main station system low-frequency oscillation recognition capability, communication protocol consistance, PMU clock accuracy, PMU measuring accuracy in discovery, and the effect of PMU device is affected.Therefore, adopting which kind of method that the performance of PMU device is made accurately and estimate, guarantee the stable operation of PMU device, is the emphasis that we study.
Along with electrical network develops to extensive, big unit and EHV transmission, power grid operation and electrical network vibration become focal issue, in order to address this problem, the PMU device seems particularly important in application on power system, and electrical network is also more and more higher for the performance requirement of PMU device.Therefore, adopt which kind of method that the performance of PMU device is made accurately and estimate, the stable operation of assurance device is also extremely important.
At present, PMU device examination test commonly used utilizes dynamic simulator system to vibrate and provides data source to PMU, checks the ability of PMU device capture system vibration.In this case, the system oscillation signal of dynamic similation can not be known accurately, whether this has correctly brought a lot of uncertain factors to the system oscillation signal that judge PMU captures, in addition, present method of testing does not relate to major functions such as PMU device step ability and time synchronized ability is detected.Therefore, present method of testing is system not, and content measurement is not comprehensive yet.
In PMU device to test in the past, subject matter is that the test data source is a simulation power system oscillation phenomenon under the dynamic simulation test condition, and data source is uncertain, can not trace back, and the precision of time synchronized can not guarantee.Therefore test result can not compare with data source that can not trace back with uncertain.And present PMU device test method not system is not comprehensive yet.
Summary of the invention
The invention of this method of testing be exactly solve the test data source uncertain and can not trace back, the problem of time synchronized and uncomplete content face, and the method for testing of the system of formulation and comprehensive content measurement can be used for network access testing, onsite acceptance test and the on-the-spot test of PMU device.
For achieving the above object, technical scheme of the present invention is: a kind of detection method of phasor measurement unit PMU, this method comprises the steps:
1) the Omicron tester is linked to each other with notebook by telecommunication cable, the parameter such as data, waveform of Omicron output is set by notebook and is used for playback COMTRADE formatted file;
2) utilize the gps time source that the Omicron tester is carried out the school, make moment output voltage, the electric current equal excitation amount of Omicron tester in regulation;
3) catch the data that the PMU device is exported with PMU synchronized phasor data analysis software, and become the file of .csv form to preserve data-switching, utilize next step data analysis;
4) at first set up required various waveform libraries according to test event, the generation of waveform is divided into two kinds: a kind of is to utilize the Omicron relay-protection tester to set up the .seq file of static accuracy test, time precision test and step response; Another kind is to utilize PSCAD waveform Core Generator, and the waveform library (COMTRADE form) of setting up the needed various waveforms of test utilizes the PSCAD instrument to set up circuit diagram, and adjusts parameters according to the test needs, forms various waveforms;
5) when test, select the wave file of corresponding .seq file or COMTRADE form according to test event;
6) use Omicron relay-protection tester playback .seq file or COMTRADE file; When playback .seq file, the time of wave shape playback is set in " GPS setting ", make waveform carry out playback in the moment of regulation;
7) PMU carries out data acquisition, then by communication protocol to the main website emulation tool software literary composition of delivering newspaper;
8) use PMU synchronized phasor data analysis software to read the stipulations message, and amplitude, phase data are preserved in conversion;
9) data that previous step is obtained and library file raw data are analyzed, and obtain test result then, utilize following 3 kinds of methods analysts:
I) MATLAB data analysing method mainly carries out frequency analysis;
Ii) EXCEL mathematical statistics analytical approach is mainly used in the static measurement accuracy test;
Iii) curve plotting, as supplementary means, the difference between description input curve and the curve of output and the variation tendency of the measuring accuracy and the amount of influence find the best scope of device to test precision.
In this test invention, set up the comprehensive, scientifical test system of a cover.At first be to have prepared various waveform libraries for test; divide for by the Omicron relay-protection tester and set up the static accuracy test; the .seq file of time precision test and step response and the waveform storehouse that utilizes PSCAD to generate; comprise amplitude waveform storehouse; the hunting of frequency waveform library; sensitivity waveform storehouse; harmonic interference waveform storehouse and hybrid waveform storehouse; in waveform; can be according to the needs modification parameter wherein of test; generate the system signal that test needs; therefore stationary singnal in above waveform; step signal and oscillator signal all are known; this has just solved uncertain and the problem that can not tracing back property in test data source, and has examined or check the step ability of PMU device.Secondly, the Omicron tester has the gps time receiving equipment that carries, and the time precision that can guarantee self uses the Omicron tester accurately to export to the PMU device in the moment of regulation in 5 microseconds, and this has just solved the problem of time synchronized.In addition, this test invention has also related to environment and the EMC check to the PMU device.Therefore the method for testing and the comprehensive content measurement of system in this test, have been formulated.
Major advantage of the present invention is as follows:
1) closed loop test, adopt PSCAD to generate the test waveform storehouse, use the Omicron tester accurately to export to the PMU device in the moment of regulation, gather PMU device output data by the main website emulation tool, output data analyzed automatically draw test result, test result and given data source have relatively formed the closed loop test.
2) test result is handled automatically, adopts Excel and Matlab to carry out analyzing and processing automatically, has avoided because the error that human factor is brought to test result analysis.
3) stipulations uniformity test uses the stipulations testing tool that the PMU device is carried out the stipulations uniformity test.
4) content measurement is comprehensive, not only comprises PMU device performance test (dynamic property, static properties and step response), has also comprised environmental testing and EMC test.So more fully investigated the performance of PMU device.
Description of drawings
Fig. 1 is an Omicron tester connection layout;
Fig. 2 is a gps time source connection layout;
Fig. 3 is a PMU synchronized phasor data analysis process;
Fig. 4 is a PMU device to test structural drawing;
Fig. 5 is test process figure;
Fig. 6 is the PSCAD tool drawing;
Fig. 7 is a playback .seq waveform synoptic diagram;
Fig. 8 is a playback COMTRADE form waveform;
Fig. 9 is for being provided with the wave shape playback time diagram;
Grand middle computing formula in Figure 10 Microsoft Excel;
Figure 11 frequency-voltage magnitude graph of errors;
The frequency of Figure 12 signal and gain.
Embodiment
1, this method of testing mainly comprises the following aspects:
1) content measurement
2) environmental testing, environmental testing are mainly investigated the adaptive faculty of PMU device to environment, and the PMU device can be finished basic functions after guaranteeing under the climatic environment that test is paid close attention to, and unlikely breaking down.
3) adaptive faculty of PMU device under various electromagnetic environments mainly investigated in EMC test, guarantees that the PMU device can bear the electromagnetic interference (EMI) that comes from the outside in operational process and unlikely generation is unusual, malfunction or fault.
4) function, performance test verify mainly whether the PMU device can finish basic requirements, for later use provides important evidence.Function, the test event that performance is detailed see Table 1.
Table 1PMU device performance, functional test repertory
2, testing apparatus and software
A) Omicron tester
As shown in Figure 1, Omicron CMC256 tester links to each other with notebook by telecommunication cable, and the parameters such as data, waveform of Omicron output are set by notebook, also can playback COMTRADE formatted file.
B) gps clock source
When the school was carried out to Omicron CMC256 tester in the gps time source, Omicron CMC256 tester was in the moment output drive amount (voltage, electric current etc.) of regulation.See Fig. 2.
C) PMU synchronized phasor data analysis software
PMU synchronized phasor data analysis software is caught the data of PMU device output, and becomes the file of .csv form to preserve data-switching, utilizes next step data analysis.See Fig. 3.
D) at first set up required various waveform libraries according to test event, the generation of waveform is divided into two kinds: a kind of is to utilize the Omicron relay-protection tester to set up the .seq file of static accuracy test, time precision test and step response.Another kind is to utilize PSCAD waveform Core Generator, sets up the waveform library (COMTRADE form) of the needed various waveforms of test, as shown in Figure 5, utilizes the PSCAD instrument to set up circuit diagram, and adjusts parameters according to the test needs, forms various waveforms
E) when test, select the wave file of corresponding .seq file or COMTRADE form according to test event;
F) use Omicron relay-protection tester playback .seq file or COMTRADE file; Before the .seq file playback, see Fig. 6 and Fig. 7.
G) when playback .seq file, the time of wave shape playback is set in " GPS setting ", make waveform carry out playback in the moment of regulation, see Fig. 8.
H) PMU carries out data acquisition, then by communication protocol to the main website emulation tool software literary composition of delivering newspaper;
I) use PMU synchronized phasor data analysis software to read the stipulations message, and amplitude, phase data are preserved in conversion;
J) data that previous step is obtained and library file raw data are analyzed, and obtain test result then, and following 3 kinds of analytical approachs are specifically arranged:
I) MATLAB data analysing method mainly carries out frequency analysis;
Ii) EXCEL mathematical statistics analytical approach is mainly used in the static measurement accuracy test;
Iii) curve plotting, as supplementary means, the difference between description input curve and the curve of output and the variation tendency of the measuring accuracy and the amount of influence find the best scope of device to test precision.
Detailed data analysing method is seen Fig. 9.
K) according to the result of test, the PMU device performance is estimated.
3, data statistical analysis method
Analysis of measurement errors
Purposes: be mainly used in the static measurement accuracy test.
According to the needs of data analysis grand inediting computing formula at Microsoft Excel, utilize the existing computing formula of EXCEL grand, automatically the static data of PMU device output is analyzed, drawn the index of the relative error of measurement then as examination PMU measurement device precision.See Figure 10.
A) graph of errors
Purposes: be mainly used in the static measurement accuracy test.
For the static measurement accuracy test, except measuring error, also to observe the change trend curve of its error, for example voltage magnitude measuring accuracy test with the amount of influence, the amount of considering of influence has frequency, the relation curve of at this moment will draw amplitude measurement error and amplitude.As Figure 11:
By graph of errors, the accurate interval of the variation tendency of PMU device to test precision and PMU measurement device as can be seen.
B) MATLAB spectrum analysis
Purposes: be mainly used in dynamic test, comprise hunting of frequency test, amplitude vibration test and frequency aliasing test.Be used for the oscillating signal that comprises in the analytic signal, thus the frequency that obtains vibrating.
The MATLAB instrument can be analyzed the amplitude and the phase data of PMU output, goes out the frequency spectrum of signal then by automatic spectrum analysis algorithm computation, comprising the frequency and corresponding the gain (as Figure 12) of signal, and then is analyzed with input signal.

Claims (1)

1. the detection method of a phasor measurement unit PMU is characterized in that, this method comprises the steps:
1) the Omicron tester is linked to each other with notebook by telecommunication cable, the parameter such as data, waveform of Omicron output is set by notebook and is used for playback COMTRADE formatted file;
2) utilize the gps time source that the Omicron tester is carried out the school, make moment output voltage, the electric current equal excitation amount of Omicron tester in regulation;
3) catch the data that the PMU device is exported with PMU synchronized phasor data analysis software, and become the file of .csv form to preserve data-switching, utilize next step data analysis;
4) at first set up required various waveform libraries according to test event, the generation of waveform is divided into two kinds: a kind of is to utilize the Omicron relay-protection tester to set up the .seq file of static accuracy test, time precision test and step response; Another kind is to utilize PSCAD waveform Core Generator, and the waveform library (COMTRADE form) of setting up the needed various waveforms of test utilizes the PSCAD instrument to set up circuit diagram, and adjusts parameters according to the test needs, forms various waveforms;
5) when test, select the wave file of corresponding .seq file or COMTRADE form according to test event;
6) use Omicron relay-protection tester playback .seq file or COMTRADE file; When playback .seq file, the time of wave shape playback is set in " GPS setting ", make waveform carry out playback in the moment of regulation;
7) PMU carries out data acquisition, then by communication protocol to the main website emulation tool software literary composition of delivering newspaper;
8) use PMU synchronized phasor data analysis software to read the stipulations message, and amplitude, phase data are preserved in conversion;
9) data that previous step is obtained and library file raw data are analyzed, and obtain test result then, utilize following 3 kinds of methods analysts:
I) MATLAB data analysing method mainly carries out frequency analysis;
Ii) EXCEL mathematical statistics analytical approach is mainly used in the static measurement accuracy test;
Iii) curve plotting, as supplementary means, the difference between description input curve and the curve of output and the variation tendency of the measuring accuracy and the amount of influence find the best scope of device to test precision.
CN200910305475A 2009-08-10 2009-08-10 Detection method of phasor measurement unit PMU Pending CN101629995A (en)

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CN103023419A (en) * 2012-12-13 2013-04-03 华北电力大学 PMU (Phasor Measurement Unit) data filtering method for generator synchronous reactance parameter identification
CN103033789A (en) * 2012-12-26 2013-04-10 华北电力大学 Static and dynamic test system of synchronous phasor measurement unit pressure measuring unit (PMU)
CN103036498A (en) * 2012-10-18 2013-04-10 中国电力科学研究院 Synchronous generator practical model parameter examination and identification method based on parameter measure unit (PMU)
CN103529418A (en) * 2013-10-18 2014-01-22 国家电网公司 Method and device for dynamically testing synchronized phasor measurement unit (PMU) in power system
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CN106771599A (en) * 2016-11-21 2017-05-31 国网四川省电力公司电力科学研究院 Intelligent substation synchronous phasor measuring device method of testing and test device
CN106886207A (en) * 2015-12-16 2017-06-23 南京南瑞集团公司 A kind of synchronization detecting method
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