CN103383414B - A kind of computing method being applied to the voltage angle of distribution terminal - Google Patents
A kind of computing method being applied to the voltage angle of distribution terminal Download PDFInfo
- Publication number
- CN103383414B CN103383414B CN201310288393.6A CN201310288393A CN103383414B CN 103383414 B CN103383414 B CN 103383414B CN 201310288393 A CN201310288393 A CN 201310288393A CN 103383414 B CN103383414 B CN 103383414B
- Authority
- CN
- China
- Prior art keywords
- voltage
- groups
- distribution terminal
- acquisition circuit
- angle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000004364 calculation method Methods 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 19
- 239000006185 dispersion Substances 0.000 claims description 23
- 230000007704 transition Effects 0.000 claims description 4
- 241001269238 Data Species 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of computing method being applied to the voltage angle of distribution terminal, voltage is gathered by the Acquisition Circuit in distribution terminal, voltage after acquisition process carries out relevant treatment by the arithmetical unit in distribution terminal, draw corresponding operation result, store in the storer of distribution terminal arc cosine table, arc cosine table is in advance made by operation result, by automatic retrieval, the voltage angle finding operation result corresponding, through actual measurement, the present invention is under enough sample datas, required voltage angle can be calculated accurately, meet practical application, and computing is not by the impact of signal frequency change, avoid floating-point operation simultaneously, improve operation efficiency.
Description
Technical field
The present invention relates to circuit data process, particularly a kind of computing method being applied to the voltage angle of distribution terminal.
Background technology
Distribution terminal is the important component part of DA (power distribution automation) system, is positioned at basal layer.The data such as the criterion that the real time data of DA system, fault process automatically, the operating condition of switchgear all derive from distribution terminal, the power supply of fault isolation, load transfer plan, recovery non-faulting section, to feedback On line switch point/closing operation is all go to perform by distribution terminal, the reliability of distribution terminal work, real-time directly affect reliability and the real-time of whole DA system.
When carrying out measuring the same period to voltage, need the angle between calculating two voltages.Distribution terminal generally adopts Fourier transform method for the calculating of angle, calculates imaginary part and the real part of voltage, then by each phase voltage angle of arctangent computation.Fourier calculates needs complete voltage signal sample, but voltage signal is the process of a change, like this when voltage signal cycles changes, if sample data is incomplete, the calculating of real part and imaginary part there will be error, cause angle calcu-lation to occur error, and the calculating of arc tangent relate to floating-point operation, higher to the resource consumption of CPU.
Summary of the invention
For solving the problem, the object of the present invention is to provide a kind of voltage angle calcu-lation method being applied to distribution terminal, reducing signal intensity frequency to the impact of result, and improving place to go efficiency.
The present invention solves the technical scheme that its problem adopts:
Be applied to computing method for the voltage angle of distribution terminal, comprise:
Gather two groups of voltages by the Acquisition Circuit of distribution terminal, two groups of voltage transitions, after collection two groups of voltages, are two groups of mutual corresponding voltage dispersion values by described Acquisition Circuit;
Two groups of process gained mutual corresponding voltage dispersion values are sent to the processor of distribution terminal by Acquisition Circuit, described processor and Acquisition Circuit are electrically connected, result after processor is multiplied according to two discrete voltage that these two groups mutual corresponding voltage dispersion values calculate correspondence mutually in two groups of voltage dispersion values, and after being multiplied to every two discrete voltage, the result of gained is sued for peace;
Processor according to draw be multiplied with value calculating two discrete voltage after mean value, with this mean value for molecule, with the product of the corresponding respectively voltage effective value of two groups of voltage dispersion values for denominator, draw the operation values between molecule and denominator;
Processor searches arc cosine table according to this operation values, the angle value corresponding to this operation values is found out from arc cosine table, described arc cosine table is stored in the storer of distribution terminal, distribution terminal can automatically be retrieved and read data, and described arc cosine table includes the angle value corresponding to nonidentity operation value.
Described Acquisition Circuit is after collection two groups of voltages, be that two groups of mutual corresponding voltage dispersion values are specially by two groups of voltage transitions: Acquisition Circuit is processed the two groups of voltages gathered by voltage transformer pt, two of collection groups of voltages are made to change two groups of corresponding differential signals respectively into, two groups of differential signals are transformed to two groups of mutual corresponding voltage dispersion values by AD converter by simulating signal, described AD converter and voltage transformer pt are electrically connected, the circuit that described Acquisition Circuit is connected with AD converter for voltage transformer pt.
Described method also comprises: before described processor searches arc cosine table according to this operation values, this operation values is amplified 1000 times by processor, corresponding, described arc cosine table is that operation values amplifies arc cosine angle value corresponding after 1000 times.
The invention has the beneficial effects as follows:
The present invention adopts a kind of computing method being applied to the voltage angle of distribution terminal, and Acquisition Circuit is after collection voltage, and specific calculation avoids the impact of voltage signal change, simplifies calculating simultaneously, avoids floating-point operation to increase the computational load of CPU.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and example, the invention will be further described.
Fig. 1 is the method for the invention process flow diagram;
Embodiment
Distribution terminal is when determining whether synchronous voltage, and the angle between needing two voltages calculates.The invention provides a kind of method obtaining this angle.
With reference to process flow diagram shown in Fig. 1, be first gather voltage, there is Acquisition Circuit distribution terminal inside, can gather, of course voltage, and the signal on the circuit that Acquisition Circuit can gather is not limited only to voltage, and electric current, resistance etc. can.Acquisition Circuit of the present invention comprises voltage transformer pt and AD converter, and described voltage transformer pt and AD converter are electrically connected.After having voltage signal by PT, this signal is transformed to the differential signal that Vp-p is no more than 4V by PT, and wherein Vp-p is the peak value of converted voltage, and AD converter receives this differential signal, and this simulating signal is transformed to corresponding discrete data.The present invention is when applying, and Acquisition Circuit can gather two groups of voltages, and these two groups of voltages are after PT, and can be transformed to the differential signal that two groups of corresponding Vp-p are no more than 4V, AD converter receives this two groups of differential signals, is converted into two groups of mutual corresponding voltage dispersion values.
Secondly, carry out computing to the voltage after acquisition process and draw operation result, the voltage after described acquisition process is two groups of mutual corresponding voltage dispersion values of gained after Acquisition Circuit process.Distribution terminal is when gathering voltage, and the voltage of collection can more than two, but when calculating voltage angle, then be also calculate two wherein.Two groups of process gained mutual corresponding voltage dispersion values are sent to the processor of distribution terminal by Acquisition Circuit, described processor and Acquisition Circuit are electrically connected, result after processor is multiplied according to two discrete voltage that these two groups mutual corresponding voltage dispersion values calculate correspondence mutually in two groups of voltage dispersion values, and the result of gained is sued for peace after being multiplied to every two discrete voltage, processor according to draw be multiplied with value calculating two discrete voltage after mean value, with this mean value for molecule, with the product of the voltage effective value of two groups of voltage dispersion values difference correspondences for denominator, draw the operation values between molecule and denominator.Suppose that in two groups of voltage dispersion values, each group all has the discrete voltage of N number of correspondence, then the result summation after being multiplied to mutually corresponding two, namely draws:
, wherein Ua and Ub is respectively two groups of mutually corresponding voltage dispersion values, according to this and the mean value after being worth two discrete voltage of correspondence to be mutually multiplied:
, with this mean value for molecule, with
with
product be denominator, wherein
with
be respectively with
,
corresponding voltage effective value, draws final end value:
.Known to general, during angle between calculating voltage and electric current, following formulae discovery can be adopted:
, wherein
for the angle between electric current and voltage, P is active power, and S is applied power, and N is the voltage data number gathered,
with
be respectively effective voltage, electric current.Contrast above formula, then the angle between voltage, the angle such as between voltage U a and Ub then can pass through formula
calculate, wherein N value is the number of conversion gained discrete data,
with
for changing the voltage dispersion data of the correspondence of gained,
with
be respectively with
,
corresponding voltage effective value, the molecule in this formula is equivalent to the power P in first formula, and denominator is equivalent to the power S in first formula, by obtaining corresponding voltage angle after arc cosine computing.
In order to reduce floating-point operation, save the load of processor, the present invention, when carrying out computing to voltage, only passes through
calculate corresponding operation result, the value of operation result falls within interval [-1,1], then operation result is found out corresponding angle value according to arc cosine table search.Described arc cosine table, for be made according to operation result in advance, includes the angle value corresponding to nonidentity operation value, is stored in the storer of distribution terminal, and when needed, distribution terminal can automatically be retrieved and read data.
When finally searching arc cosine table according to result, operation result can be exaggerated 1000 times, corresponding, the operation result in arc cosine table and corresponding angle value are for amplify 1000 latter made angle values according to operation result in advance.
Use the method for the invention, respectively the angle calcu-lation between voltage is carried out to the wave band in four cycles, concrete outcome sees table the contrast between shown measurement result and True Data, can find out, as long as ensure enough sample datas to provide calculating from table, the present invention can calculate voltage angle accurately, the voltage angle value calculated meets practical application completely, and computing is simple, not by the impact of signal frequency change, and avoid floating-point operation, improve operation efficiency.
The above, just preferred embodiment of the present invention, the present invention is not limited to above-mentioned embodiment, as long as it reaches technique effect of the present invention with identical means, all should belong to protection scope of the present invention.
Claims (3)
1. be applied to computing method for the voltage angle of distribution terminal, it is characterized in that, comprising:
Gather two groups of voltages by the Acquisition Circuit of distribution terminal, two groups of voltage transitions, after collection two groups of voltages, are two groups of mutual corresponding voltage dispersion values by described Acquisition Circuit;
Two groups of process gained mutual corresponding voltage dispersion values are sent to the processor of distribution terminal by Acquisition Circuit, described processor and Acquisition Circuit are electrically connected, result after processor is multiplied according to two discrete voltage that these two groups mutual corresponding voltage dispersion values calculate correspondence mutually in two groups of voltage dispersion values, and after being multiplied to every two discrete voltage, the result of gained is sued for peace;
Processor according to draw be multiplied with value calculating two discrete voltage after mean value, with this mean value for molecule, with the product of the corresponding respectively voltage effective value of two groups of voltage dispersion values for denominator, draw the operation values between molecule and denominator;
Processor searches arc cosine table according to this operation values, the angle value corresponding to this operation values is found out from arc cosine table, described arc cosine table is stored in the storer of distribution terminal, distribution terminal can automatically be retrieved and read data, and described arc cosine table includes the angle value corresponding to nonidentity operation value.
2. a kind of computing method being applied to the voltage angle of distribution terminal according to claim 1, it is characterized in that, described Acquisition Circuit is after collection two groups of voltages, be that two groups of mutual corresponding voltage dispersion values are specially by two groups of voltage transitions: Acquisition Circuit is processed the two groups of voltages gathered by voltage transformer pt, two of collection groups of voltages are made to change two groups of corresponding differential signals respectively into, two groups of differential signals are transformed to two groups of mutual corresponding voltage dispersion values by AD converter by simulating signal, described AD converter and voltage transformer pt are electrically connected, the circuit that described Acquisition Circuit is connected with AD converter for voltage transformer pt.
3. a kind of computing method being applied to the voltage angle of distribution terminal according to claim 1, it is characterized in that, described method also comprises: before described processor searches arc cosine table according to this operation values, this operation values is amplified 1000 times by processor, corresponding, described arc cosine table is that operation values amplifies arc cosine angle value corresponding after 1000 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310288393.6A CN103383414B (en) | 2013-07-10 | 2013-07-10 | A kind of computing method being applied to the voltage angle of distribution terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310288393.6A CN103383414B (en) | 2013-07-10 | 2013-07-10 | A kind of computing method being applied to the voltage angle of distribution terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103383414A CN103383414A (en) | 2013-11-06 |
| CN103383414B true CN103383414B (en) | 2015-09-30 |
Family
ID=49491258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310288393.6A Expired - Fee Related CN103383414B (en) | 2013-07-10 | 2013-07-10 | A kind of computing method being applied to the voltage angle of distribution terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103383414B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU983572A1 (en) * | 1979-10-26 | 1982-12-23 | Ордена Ленина Институт Кибернетики Ан Усср | Electric signal phase shift measuring method |
| CN101315397A (en) * | 2008-06-25 | 2008-12-03 | 中国海洋石油总公司 | Amplitude phase measuring method |
| CN101408568A (en) * | 2007-10-12 | 2009-04-15 | 深圳科士达科技股份有限公司 | Method and device for measuring electrical signal phase of alternating current |
| CN102043091A (en) * | 2009-10-21 | 2011-05-04 | 中国科学院半导体研究所 | Digitized high-precision phase detector |
| CN102095932A (en) * | 2010-12-02 | 2011-06-15 | 山东电力研究院 | Detection method of voltage phase at access point of photovoltaic inverter |
| CN102809688A (en) * | 2012-07-13 | 2012-12-05 | 中冶南方工程技术有限公司 | Method for calculating three-phase voltage real-time phase based on Iterative Fourier transform |
-
2013
- 2013-07-10 CN CN201310288393.6A patent/CN103383414B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU983572A1 (en) * | 1979-10-26 | 1982-12-23 | Ордена Ленина Институт Кибернетики Ан Усср | Electric signal phase shift measuring method |
| CN101408568A (en) * | 2007-10-12 | 2009-04-15 | 深圳科士达科技股份有限公司 | Method and device for measuring electrical signal phase of alternating current |
| CN101315397A (en) * | 2008-06-25 | 2008-12-03 | 中国海洋石油总公司 | Amplitude phase measuring method |
| CN102043091A (en) * | 2009-10-21 | 2011-05-04 | 中国科学院半导体研究所 | Digitized high-precision phase detector |
| CN102095932A (en) * | 2010-12-02 | 2011-06-15 | 山东电力研究院 | Detection method of voltage phase at access point of photovoltaic inverter |
| CN102809688A (en) * | 2012-07-13 | 2012-12-05 | 中冶南方工程技术有限公司 | Method for calculating three-phase voltage real-time phase based on Iterative Fourier transform |
Non-Patent Citations (2)
| Title |
|---|
| 一种新的相位(差)算法及其在自动准同期中的应用;陈小桥等;《武汉大学学报( 工学版)》;20031231;第36卷(第6期);96-99 * |
| 由80C196KC 单片机构成整流电路的自适应数字触发器;王鸿雁等;《继电器》;20010131;第29卷(第1期);41-43 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103383414A (en) | 2013-11-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102305891B (en) | On-line monitoring method of low-frequency oscillation of power system | |
| CN106405230B (en) | Frequency measurement method and device | |
| CN111624544A (en) | Transformer area household transformation relation identification method and related device | |
| CN203909191U (en) | Electric energy quality analyzing system based on ARM and FPGA | |
| CN104777383A (en) | Non-invasive electrical load monitoring and load decomposing device | |
| CN103675447B (en) | A kind of high-precision real time-harmonic wave analysis method of electric railway | |
| CN104749435A (en) | DFT harmonic detection method without accumulated error sliding window | |
| Okumus et al. | A random forest-based approach for fault location detection in distribution systems | |
| CN109633257B (en) | Active power measuring method with accurate measurement | |
| CN103176108A (en) | Double-terminal fault location method and double-terminal fault location system for transmission line | |
| CN102680768B (en) | Mono-polar type voltage measurement sensor with self-correction and self-construct electric filed and measurement method | |
| CN202615205U (en) | Intelligent managing and monitoring device for laboratory instruments based on Internet of Things | |
| CN204287320U (en) | A kind of current signal periodically harvester | |
| CN102072983A (en) | Method for judging voltage sag reason | |
| CN104267258A (en) | Harmonic instantaneous power calculating method utilizing incomplete S transform | |
| CN104833853A (en) | Frequency-adaptive slide window DFT harmonic wave detection method | |
| CN104698265A (en) | High-voltage direct current transmission line corona loss measurement system | |
| CN103383414B (en) | A kind of computing method being applied to the voltage angle of distribution terminal | |
| CN110007146B (en) | Resonance point detection method based on voltage and current harmonic phases | |
| CN108982954B (en) | Method and system for calculating phase voltage amplitude and phase suitable for feeder line terminal | |
| CN103513133A (en) | Device and method for measuring MCR type SVC device dynamic response time | |
| CN111351996A (en) | Non-invasive electrical load identification method and device | |
| CN104502686A (en) | Method for detecting three-phase electric parameter | |
| CN204086401U (en) | For the device of power transmission line power frequency parameters measuring | |
| CN204359882U (en) | A kind of quality of power supply analysis device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150930 Termination date: 20200710 |