CN101271134B - Test method of electric power line voltage phase angle - Google Patents
Test method of electric power line voltage phase angle Download PDFInfo
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- CN101271134B CN101271134B CN2008100662868A CN200810066286A CN101271134B CN 101271134 B CN101271134 B CN 101271134B CN 2008100662868 A CN2008100662868 A CN 2008100662868A CN 200810066286 A CN200810066286 A CN 200810066286A CN 101271134 B CN101271134 B CN 101271134B
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- power line
- phase angle
- line voltage
- voltage phase
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Abstract
The invention provides a power line voltage phase angle testing method, and the method comprises the following steps that: A: the errors of a plurality of clock sources are measured; B: a plurality of clock sources are respectively arranged in a plurality of power line voltage phase angle testing devices; C: the power line voltage phase angle testing devices are carried out by the synchronous clearing, and the accumulated counting is simultaneously started; D: the power line voltage phase angle testing devices carry out the data sampling of the voltage of the power line within the sampling period, and the sampling data is stored in a memory; E: and the sampling data is transmitted to a CVI development platform to carry out the analysis. The testing method has the advantages that: the testing method adopts the synchronous counting clock sources to record the time and select the effective collected data to carry out the analysis, thus greatly improving the testing precision of the voltage phase angle, at the same time, reducing the cost.
Description
[technical field]
The present invention relates to the method for testing of power system measuring technical field, particularly a kind of electric power line voltage phase angle.
[background technology]
Along with the continuous expansion of electric system scale, high capacity, UHV (ultra-high voltage), long distance power transmission are increasing, and the structure of electric system is increasingly sophisticated.Control from the stability and the system of electric system, phase angle is wherein topmost quantity of state, and voltage phase angle especially reflects the steady stability and the transient stability situation of electric system.Existing measuring method to voltage phase angle is to determine two sampled points earlier on electrical network, it is sampled simultaneously, then image data is sent to the dispatching center by remote channel respectively, promptly obtains voltage phase angle after this image data process waveform recovery and the data analysis.This method requires to have higher clock synchronization accuracy between the sampling apparatus, and in addition, the transmission time difference of image data also can influence the voltage phase angle computational accuracy.Like this, for the long-distance transmissions electrical network of 50Hz power frequency amount, the synchronous error of 1ms can produce 18 ° phase error, guarantee phase error less than 1 °, just necessarily requires synchronous error to be no more than 55us, and prior art is difficult to reach.
As shown in Figure 1, a kind of method of testing of utilizing the existing voltage phase angle of GPS (Global Positioning System GPS is called for short GPS) system.It utilizes gps system that a common time reference is provided, and in the sending end of electrical network and receiving end one GPS receiver (comprising 01 and 02) is set respectively and produces synchronization pulse, and same satellite of simultaneous observation is measured the relative deviation of two sampling apparatus clocks.Utilize gps system to carry out the transmission of time signal, usually can be subjected to the influence of following factor and produce error: the deviation during satellite clock relative GPS system (being called for short satellite clock correction), GPS receiver clock and the deviation of gps system clock, orbit error, relativistic effect, atmospheric envelope effect, ionospheric effect, tropospheric delay, receiver tracking ring error, multipath and occlusion effect, satellite and receiver hardware deviation of satellite or the like.Though, utilize gps system that the precision of test voltage phase angle is increased, because the above-mentioned factor that influences measuring accuracy is too many, any link goes wrong and all can cause bigger measuring error and can not satisfy pre-provisioning request.
[summary of the invention]
In order to solve existing technical matters, the invention provides the method for testing of electric power line voltage phase angle, adopt synchronous counting clock source to come writing time and choose effective image data to analyze, thereby when reducing cost, improved the measuring accuracy of voltage phase angle greatly.
The present invention solves the technical scheme that existing technical matters adopts: a kind of method of testing of electric power line voltage phase angle is provided, and this method may further comprise the steps:
A: measure the error between a plurality of clocks source;
B: should place respectively in a plurality of electric power line voltage phase angle proving installations in a plurality of clocks source;
C: described electric power line voltage phase angle proving installation is carried out synchronous zero clearing, start stored count simultaneously;
D: described electric power line voltage phase angle proving installation voltage to power circuit in the sampling period carries out data sampling, and sampled data deposits in the storer;
E: import sampled data into the CVI development platform and analyze.
The present invention further improves, in steps A, and the same model of described clock source selection, same batch constant temperature 25MHZ crystal oscillator.
The present invention further improves, and in steps A, described error comprises systematic error or conformity error.
The present invention further improves, and in step C, described electric power line voltage proving installation is to use same synchronizing pulse to carry out zero clearing in same place.
It is that step D is further comprising the steps of that the present invention further improves
D1: many unified sample command that start of described electric power line voltage proving installation;
D2: many described electric power line voltage proving installations carry out the voltage data collection with A/D converter in the sampling period;
D3: sampled data imported in the storer preserve.
It is that step e is further comprising the steps of that the present invention further improves
E1: import the image data of storage into PC;
E2: last the time with each image data of CVI development platform comparison on the PC is pairing, cooperate the error in clock source to determine in the image data efficiently sampling data segment simultaneously in the absolute time section;
E3: described efficiently sampling data segment analyzed with waveform recover to calculate the voltage phase angle parameter.
The present invention further improves, and in step D2, it is ADS7864 that described A/D converter is selected model for use.
The present invention further improves, and in step D3, it is AT45DB321D 32M Flash that described storer is selected model for use.
The present invention further improves, and in step D2, the described sampling period was made as 5 minutes.
The present invention further improves, and in step D, power circuit is the power transmission lines of 50HZ power frequency amount.
Compared to prior art, the invention has the beneficial effects as follows: adopt synchronous counting clock source to come writing time,, improve time precision in conjunction with the error in counting clock source itself; In addition, employing further selects effective image data to carry out the analysis of voltage phase angle on the basis of image data, further reject error effect, improved the precision of time and data, thereby the method for testing of electric power line voltage phase angle of the present invention has improved the measuring accuracy of voltage phase angle when reducing cost.
[description of drawings]
Fig. 1 is the synoptic diagram of existing GPS test voltage phase angle method;
Fig. 2 is the method for testing one embodiment synoptic diagram of electric power line voltage phase angle of the present invention.
[embodiment]
The present invention is further described below in conjunction with description of drawings and embodiment.
The invention provides a kind of method of testing of electric power line voltage phase angle, this method may further comprise the steps:
A: measure the error between a plurality of clocks source, the same model of these a plurality of clock source selection, same batch constant temperature 25MHZ crystal oscillator can reduce its systematic error or conformity error like this; Determine to influence the factor of clock source stability and consistance deviation, set up rational error mathematic model, to guarantee in time synchronous clock to be carried out error compensation;
B: should place respectively in a plurality of electric power line voltage phase angle proving installations in a plurality of clocks source, on the power transmission lines of 50HZ power frequency amount, a clock source is set in the electric power line voltage phase angle proving installation, have relevance between each clock source;
C: described electric power line voltage phase angle proving installation is carried out synchronous zero clearing, start stored count simultaneously, this electric power line voltage proving installation is to use same synchronizing pulse to carry out zero clearing in same place;
D: described electric power line voltage phase angle proving installation voltage to power circuit in the sampling period carries out data sampling, and sampled data deposits in the storer, and the sampling period was made as 5 minutes;
E: import sampled data into CVI (C For Virtual Instruments) development platform and carry out analysis meter and calculate voltage phase angle.
Step D of the present invention is further comprising the steps of:
D1: many unified sample command that start of described electric power line voltage proving installation promptly begin sampling at same theory under start-up time;
D2: many described electric power line voltage proving installations carry out the voltage data collection with A/D (analog todigital converter analog to digital converter) converter in the sampling period, it is ADS7864 that this A/D converter is selected model for use; This ADS7864 is two 12 A/D converters of quick 6 passage fully differentials input, can carry out the sampling of six channel signals simultaneously with the sampling rate of 500kHz;
D3: sampled data imported in the storer preserve, it is AT45DB321D 32M Flash that this storer is selected model for use.
Step e of the present invention is further comprising the steps of:
E1: import the image data of storage into PC;
E2: last the time with each image data of CVI development platform comparison on PC (personal computer) machine is pairing, cooperate the error in clock source to determine in the image data that at the efficiently sampling data segment of absolute time section, this CVI development platform can be selected NI/CVI development platform (NationalInstruments American National Instr Ltd.) simultaneously;
E3: described efficiently sampling data segment analyzed with waveform recover to calculate the voltage phase angle parameter.
The embodiment of the invention is as shown in Figure 2: step 1 tests out systematic error and the conformity error between the constant-temperature crystal oscillator clock source; Step 2, the two electric power line voltage phase angle proving installations that present embodiment is selected are A machine and B machine, the synchronous zero clearing that A, B two machines are unified in same place starts the symmetry counting simultaneously, this be synchronously absolute synchronously, from zero clearing constantly, two machines carry out stored count to separately clock respectively; Be arranged on different two places with A, B two machines this moment as required, and step 21A machine continues the symmetry counting on A ground; Step 22B machine also continues the symmetry counting on B ground; In case assign the beginning sample command, step 41A machine promptly carries out 5 minutes high-speed sampling to voltage waveform and stores, and simultaneously, step 31A machine latchs the time of lasting and storage; Symmetrically, begin from assigning the beginning sample command, step 42B machine also carries out 5 minutes high-speed sampling to voltage waveform and stores, and step 32B machine latchs the time of lasting and stores; Step 6 is compared the time data that lasts that A machine and B machine latch, and draws that the synchronized sampling start time is determined the efficiently sampling time to compensate accurately; Step 5 is carried out analytical calculation with the NI/CVI platform that the sampled data of storing is uploaded to PC; Step 7 can the output voltage phase angle.
The symmetry of A machine and B machine counting is meant in the present embodiment: in the synchronous zero clearing of unifying samely and open stored count.On same ground, synchronization, use same synchronizing pulse that synchronous zero clearing is carried out in A, the unification of B machine, this be synchronously absolute synchronously, from this moment, two machines carry out stored count to separately clock respectively.Suppose that the A machine just is placed on the A station and prepares to carry out data sampling, the B machine is the long-distance B station of being transported to, treat that A, B two stations are ready after, in a single day sample command is sent, sampling initiating key on two machines will be pressed, and at this moment A, B two machines will begin to carry out data acquisition simultaneously.Because the error of carrying out, button on A, B two machines can not be pressed by same time point, in fact work as the moment that the sampling initiating key is pressed, A, B two machines latch the time counting value of lasting at this moment, A, B two machines just will begin to press the time data that lasts that ends to " sampling initiating key " from absolute clear operation synchronously and note and send into separately microprocessor like this, and these data are A, the B machine correct time that begins of data acquisition separately just.
Method of testing of the present invention adopts synchronous counting clock source to come writing time, in conjunction with the error in counting clock source itself, improves time precision; In addition, employing further selects effective image data to carry out the analysis of voltage phase angle on the basis of image data, further reject the time error influence, the synchronism of time and the degree of accuracy of data have been improved, this time synchronization error can reach below the 10us, thereby realize the voltage phase angle measuring error less than 1 ° technical indicator, and reduce cost, improve measuring accuracy greatly.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. the method for testing of an electric power line voltage phase angle, this method may further comprise the steps:
A: measure the error between a plurality of clocks source;
B: should place respectively in a plurality of electric power line voltage phase angle proving installations in a plurality of clocks source;
C: described electric power line voltage phase angle proving installation is carried out synchronous zero clearing, start stored count simultaneously;
D: described electric power line voltage phase angle proving installation voltage to power circuit in the sampling period carries out data sampling, and sampled data deposits in the storer;
E: import sampled data into the CVI development platform and analyze.
2. method of testing according to claim 1 is characterized in that: in steps A, and the same model of described clock source selection, same batch constant temperature 25MHZ crystal oscillator.
3. method of testing according to claim 1 is characterized in that: in steps A, described error comprises systematic error or conformity error.
4. method of testing according to claim 1 is characterized in that: in step C, described electric power line voltage proving installation is to use same synchronizing pulse to carry out zero clearing in same place.
5. method of testing according to claim 1, it is characterized in that: step D is further comprising the steps of
D1: many unified sample command that start of described electric power line voltage proving installation;
D2: many described electric power line voltage proving installations carry out the voltage data collection with A/D converter in the sampling period;
D3: sampled data imported in the storer preserve.
6. method of testing according to claim 1, it is characterized in that: step e is further comprising the steps of
E1: import the image data of storage into PC;
E2: last the time with each image data of CVI development platform comparison on the PC is pairing, cooperate the error in clock source to determine in the image data efficiently sampling data segment simultaneously in the absolute time section;
E3: described efficiently sampling data segment analyzed with waveform recover to calculate the voltage phase angle parameter.
7. method of testing according to claim 5 is characterized in that: in step D2, it is ADS7864 that described A/D converter is selected model for use.
8. method of testing according to claim 5 is characterized in that: in step D3, it is AT45DB321D 32M Flash that described storer is selected model for use.
9. method of testing according to claim 5 is characterized in that: in step D2, the described sampling period was made as 5 minutes.
10. method of testing according to claim 1 is characterized in that: in step D, power circuit is the power transmission lines of 50HZ power frequency amount.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100662868A CN101271134B (en) | 2008-04-02 | 2008-04-02 | Test method of electric power line voltage phase angle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100662868A CN101271134B (en) | 2008-04-02 | 2008-04-02 | Test method of electric power line voltage phase angle |
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| CN101271134A CN101271134A (en) | 2008-09-24 |
| CN101271134B true CN101271134B (en) | 2010-09-15 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102033177B (en) * | 2010-10-25 | 2014-05-07 | 华北电力大学 | Method and system for measuring power angle of electric power circuit of distribution network |
| CN105553098A (en) * | 2015-12-09 | 2016-05-04 | 广东电网有限责任公司电力科学研究院 | Electric energy essential data synchronization processing method and system for power grid loss metering |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1123415A (en) * | 1994-11-17 | 1996-05-29 | 郝玉山 | Method for measuring phase angle of sinusoidal quantity of electric power system and measuring system |
| JP3099327B2 (en) * | 1989-05-15 | 2000-10-16 | 日本電気株式会社 | Phase measurement circuit |
| CN1477401A (en) * | 2003-07-18 | 2004-02-25 | 清华大学 | High-accuracy synchronous phasor measuring method |
| US6794857B2 (en) * | 2001-09-25 | 2004-09-21 | Ando Electric Co. Ltd. | Apparatus and method for measuring a phase delay characteristic |
| CN2893720Y (en) * | 2006-04-14 | 2007-04-25 | 邵红梅 | Phase angle monitoring instrument |
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2008
- 2008-04-02 CN CN2008100662868A patent/CN101271134B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3099327B2 (en) * | 1989-05-15 | 2000-10-16 | 日本電気株式会社 | Phase measurement circuit |
| CN1123415A (en) * | 1994-11-17 | 1996-05-29 | 郝玉山 | Method for measuring phase angle of sinusoidal quantity of electric power system and measuring system |
| US6794857B2 (en) * | 2001-09-25 | 2004-09-21 | Ando Electric Co. Ltd. | Apparatus and method for measuring a phase delay characteristic |
| CN1477401A (en) * | 2003-07-18 | 2004-02-25 | 清华大学 | High-accuracy synchronous phasor measuring method |
| CN2893720Y (en) * | 2006-04-14 | 2007-04-25 | 邵红梅 | Phase angle monitoring instrument |
Non-Patent Citations (1)
| Title |
|---|
| JP特许第3099327B2 2000.10.16 |
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