CN102645603A - Electric energy quality monitoring method - Google Patents
Electric energy quality monitoring method Download PDFInfo
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- CN102645603A CN102645603A CN2012101552448A CN201210155244A CN102645603A CN 102645603 A CN102645603 A CN 102645603A CN 2012101552448 A CN2012101552448 A CN 2012101552448A CN 201210155244 A CN201210155244 A CN 201210155244A CN 102645603 A CN102645603 A CN 102645603A
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Abstract
The invention belongs to the technical field of electric energy quality and relates to an electric energy quality monitoring method. The method comprises the following steps of: 1) setting system configuration parameters; 2) collecting voltage and current of a power grid; 3) carrying out discrete Fourier transform on the collected voltage and current of the power grid and calculating electric energy quality parameters; 4) based on the electric energy quality parameters, judging whether an electric energy quality accident happens or not; if so, executing step 5); and if not, executing step 6); 5) storing the electric energy quality parameters and executing step 7); 6) storing a result of the discrete Fourier transform and executing the step 7); and step 7) finishing a primary electric energy quality monitoring process. The electric energy quality monitoring method disclosed by the invention realizes the full record of waveforms and particularly records the waveforms when the electric energy quality accident does not happen, so as to provide evidences for comprehensively and fully analyzing the electric energy quality.
Description
Technical field
The invention belongs to quality of power supply technical field, particularly a kind of electric energy quality monitoring method.
Background technology
What tradition electric energy quality monitoring analytical equipment adopted is a kind of Wave record method of threshold triggers.After the electric energy quality monitoring analytical equipment operation, the signal of gathering is carried out computing, compare quality of power supply incidents such as judging whether to take place voltage interruption, voltage rise temporarily, voltage dip, voltage oscillation with the threshold value that configures.When quality of power supply incident takes place, trigger record ripple unit record waveform and data.When reaching writing time, record ripple unit stops record, with data storage in storer.The Wave record method of this threshold triggers generally adopts segmentation undefined record mode, before the fault, the failure removal process adopts high sampling rate record sampled value, and the perturbation process after the fault is adopted the effective value record.Although this kind method record data amount is little, be convenient to intuitive analysis fault overall process, when existing fluctuation violent simultaneously data be prone to be capped, drawback such as loss of data when trouble duration is long., quality of power supply incident can not trigger the record wave energy when not taking place in addition; Can't write down whole Wave datas; When data recorded can't satisfy the fault analysis needs when fault, can't call the overall process Wave data and analyze, be difficult to the comprehensive investigation quality of power supply comprehensively.
Summary of the invention
The present invention has overcome the defective of prior art, and a kind of electric energy quality monitoring method is provided, and when realizing that the monitoring waveform writes down entirely, has solved problems such as electric energy quality monitoring threshold triggers record ripple and information record are incomplete.
The invention discloses few what a kind of electric energy quality monitoring method of device, this method may further comprise the steps:
Step 1, the initialization system configuration parameter,
Step 3 is carried out DFT to the voltage and current of this electrical network, based on the result of this DFT, calculates the power quality parameter of this electrical network,
Step 4 compares the power quality parameter and the canonical reference value of this electrical network, judges whether to take place quality of power supply incident, if take place, and execution in step 5, if take place, execution in step 6,
Step 5 is stored the power quality parameter of this electrical network, execution in step 7,
Step 6, the result who stores this DFT, execution in step 7,
Step 7 finishes one time the electric energy quality monitoring process.
Further, magnitude of voltage and the current value of this electrical network that step 2 collects have also been stored through step 5.
Further, before step 5, the magnitude of voltage and the current value of this electrical network that step 2 is collected carry out lossless compress, magnitude of voltage and current value after this compression of step 5 storage.
Further, before execution in step 6, the result to this DFT carries out lossless compress earlier, again the result of the DFT after this compression of step 6 storage.
The beneficial effect of a kind of electric energy quality monitoring method disclosed by the invention is:
1, the present invention need not be provided with activation threshold value, and whether no matter quality of power supply incident take place all can the wave recording data, are convenient to quality of power supply incident generating process is carried out complete comprehensive analysis.
2, based on once monitoring sampling,,, reach different analysis purposes for the quality of power supply of analyzing electrical network with different criterions provides foundation through the waveform of inverse fourier transform reconstruct voltage and current.
Description of drawings
Fig. 1 is an electric energy quality monitoring method process flow diagram of the present invention.
Embodiment
Electric energy quality monitoring method of the present invention specifies as follows in conjunction with accompanying drawing and embodiment.
The invention discloses few what a kind of electric energy quality monitoring method of device, this method may further comprise the steps:
Step 1; The initialization system configuration parameter; Comprise whether setting carries out lossless compress, canonical reference value (nominal voltage, voltage deviation, tri-phase unbalance factor, nominal frequency, frequency departure, voltage harmonic containing ratio, current harmonics amount, each harmonic value etc.) and overtone order threshold value etc., and wherein, the canonical reference value can be the reference value of stipulating in the world or the national standard; It also can be the reference value that the user sets according to actual needs
Step 3; Magnitude of voltage and current value to this electrical network carry out DFT; Result based on this DFT; Can obtain real part and the imaginary part of the fundamental voltage of this electrical network, real part and imaginary part, the real part of each harmonic voltage and the real part and the imaginary part of imaginary part and each harmonic electric current of fundamental current respectively; Thereby can calculate the concrete numerical value of each item power quality parameter (like frequency departure, voltage deviation, voltage fluctuation and flicker, tri-phase unbalance factor etc.) of this electrical network according to the computing formula of each power quality parameter
Step 4 compares each item power quality parameter value and canonical reference value, judges whether to have taken place quality of power supply incident, if take place, and execution in step 5, if do not take place, execution in step 6,
Step 5, each item power quality parameter value of storing this electrical network, execution in step 7,
Step 6; The result of DFT in the storing step 3, execution in step 7 is from angle of practical application; The real part of n (as 50 times) harmonic voltage harmonic electric current and the requirement that imaginary part can satisfy voltage, current waveform reconstruct before step 6 needs are preserved in the fourier transform results
Step 7 finishes one time the electric energy quality monitoring process.
In the monitoring time of setting, constantly repeating step 2 is to step 7, can accomplish repeatedly the electric energy quality monitoring to this electrical network.
The user checks quality of power supply waveform for ease, but through the step 5 also magnitude of voltage and the current value of this electrical network of collecting of storing step 2, is used for waveform and shows that the user can come to observe intuitively quality of power supply incident through waveform.
As a rule, the data volume that electric energy quality monitoring produces is very big, needs to use compress technique to reduce storage space; Because there is the risk of losing important information in lossy compression method, so the present invention adopts lossless compress to store data, promptly; Take place under the situation of quality of power supply incident; The magnitude of voltage and the current value of this electrical network that at first will step 2 be collected carry out lossless compress, and magnitude of voltage and the current value after this compression of step 5 storage do not take place under the situation of quality of power supply incident again; Want elder generation that the result of DFT is carried out lossless compress, again the result of the DFT after this compression of step 6 storage.
Existing electric energy quality monitoring storage be merely the parameter information when quality of power supply incident takes place, the information that collects when quality of power supply incident does not take place will not stored, this no doubt can conserve storage; But be unfavorable for the comprehensive monitoring and the analysis of quality of power supply incident; In addition, because quality of power supply incident does not take place, i.e. during the stabilization of power grids; There are not distortional point in voltage, current waveform; Approach sinusoidal curve, carry out reducible voltage, the current waveform that goes out electrical network of inverse discrete Fourier transformer inverse-discrete according to the real part of each harmonic voltage harmonic electric current and imaginary part information, so the present invention has also stored the result of DFT through step 6; The user can carry out inverse transformation through the result to DFT; Reconstruct voltage, current waveform, and the power quality parameter value of calculating The profile make that the user can be behind electric energy quality monitoring of completion; Utilization is different from the quality of power supply event analysis that the canonical reference value of setting before the monitoring is carried out repeatedly various criterion, the careful more comprehensive integrated survey quality of power supply.
Electric energy quality monitoring method disclosed by the invention; Not only can carry out the detection of quality of power supply incident, and can detect quality of power supply incident, in addition according to the standard that the user sets according to the world/national standard; The inventive method also provides quality of power supply incident that existing electric energy quality monitoring system do not have retrieval analysis function again; Promptly through this method, the user can be according to the requirement of oneself, and particularly this requirement is strict in stipulating in the world/national standard when requiring; Real part, imaginary part signal reconstruct voltage, current waveform through method step 6 is preserved provide foundation for the user judges again, retrieves and analyzes quality of power supply incident.
Above embodiment only is used to explain the present invention; And be not limitation of the present invention; The those of ordinary skill in relevant technologies field under the situation that does not break away from the spirit and scope of the present invention, can also be made various variations and modification; Therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (4)
1. an electric energy quality monitoring method is characterized in that, said method comprising the steps of:
Step 1, the initialization system configuration parameter,
Step 2, the voltage and current of collection electrical network,
Step 3 is carried out DFT to the voltage and current of said electrical network, based on the result of said DFT, calculates the power quality parameter of said electrical network,
Step 4 compares the power quality parameter and the canonical reference value of said electrical network, judges whether to take place quality of power supply incident, if take place, and execution in step 5, if take place, execution in step 6,
Step 5 is stored the power quality parameter of said electrical network, execution in step 7,
Step 6, the result who stores said DFT, execution in step 7,
Step 7 finishes one time the electric energy quality monitoring process.
2. electric energy quality monitoring method according to claim 1 is characterized in that, also stored the magnitude of voltage and the current value of the said electrical network that step 2 collects through step 5.
3. electric energy quality monitoring method according to claim 2 is characterized in that, before step 5, the magnitude of voltage and the current value of the said electrical network that step 2 is collected carry out lossless compress, magnitude of voltage and current value after the said compression of step 5 storage.
4. according to the described electric energy quality monitoring method in one of claim 1 or 3; It is characterized in that; Before execution in step 6, the result to said DFT carries out lossless compress earlier, again the result of the DFT after the said compression of step 6 storage.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104502756A (en) * | 2014-12-16 | 2015-04-08 | 华南理工大学 | Electric energy quality detection method on basis of generalized morphological open-close and close-open wavelet transform |
| CN107102195A (en) * | 2017-04-26 | 2017-08-29 | 顺特电气设备有限公司 | The electrical quantity processing of intelligent transformer terminal and network transfer method |
| CN108519532A (en) * | 2018-05-15 | 2018-09-11 | 南京丹迪克科技开发有限公司 | A kind of electric energy quality test system and its test point detecting method |
| CN109358222A (en) * | 2018-08-28 | 2019-02-19 | 广州炫通电气科技有限公司 | Power Quality Transient event recognition method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104502756A (en) * | 2014-12-16 | 2015-04-08 | 华南理工大学 | Electric energy quality detection method on basis of generalized morphological open-close and close-open wavelet transform |
| CN107102195A (en) * | 2017-04-26 | 2017-08-29 | 顺特电气设备有限公司 | The electrical quantity processing of intelligent transformer terminal and network transfer method |
| CN107102195B (en) * | 2017-04-26 | 2020-03-20 | 顺特电气设备有限公司 | Electric quantity processing and network transmission method of intelligent transformer terminal |
| CN108519532A (en) * | 2018-05-15 | 2018-09-11 | 南京丹迪克科技开发有限公司 | A kind of electric energy quality test system and its test point detecting method |
| CN109358222A (en) * | 2018-08-28 | 2019-02-19 | 广州炫通电气科技有限公司 | Power Quality Transient event recognition method and system |
| CN109358222B (en) * | 2018-08-28 | 2021-01-08 | 广州炫通电气科技有限公司 | Electric energy quality transient event identification method and system |
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Application publication date: 20120822 |