CN103336161A - A multiterminal oscillation voltage measuring method based on fiber optical communication - Google Patents
A multiterminal oscillation voltage measuring method based on fiber optical communication Download PDFInfo
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- CN103336161A CN103336161A CN201310219282XA CN201310219282A CN103336161A CN 103336161 A CN103336161 A CN 103336161A CN 201310219282X A CN201310219282X A CN 201310219282XA CN 201310219282 A CN201310219282 A CN 201310219282A CN 103336161 A CN103336161 A CN 103336161A
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Abstract
The invention discloses a multiterminal oscillation voltage measuring method based on fiber optical communication. All the transformer stations at two ends of lines where a center of out-of-step oscillation of a complex electric power system possibly falls on are provided with apparatuses. A transformer station is selected to be a main station, and the main station sends synchronization sampling signals to other substations through fiber channels. Each substation adjusts the sampling time according to synchronization sampling signals of the main station, so that oscillation voltage synchronization sampling of each station is realized, phase relationships among voltage of stations are calculated according to voltage which is sampled in a synchronized manner, and the oscillation center of out-of-step oscillation can be determined.
Description
Technical field
The present invention relates to a kind of multiterminal oscillating voltage measuring method based on optical fiber communication.
Background technology
Electric system generation catastrophic failure may cause system's generation asynchronous oscillation, for preventing system crash, sends in the interconnection of system and power plant the step-out disconnection device generally all is installed on the line; After the electric system step-out, many covers step-out disconnection device of installing in the electric system can both be experienced the desynchronizing state of system, the minimum of the voltage that experience tradition step-out disconnection device dependence device installation place is determined the step-out actuating range, since during step-out in the system each point minimum voltage numerical value influenced by system operation mode bigger, the step-out disconnection device actuating range of different mounting points can't accurately be divided, and cooperates the comparison difficulty; If near the phase place of each busbar voltage oscillation center can accurately measure step-out the time, then can by in the step-out process between each busbar voltage the variation of relative phase accurately judge the oscillation center of asynchronous oscillation.
Be used widely in electric system based on the phasor measurement of gps signal in the recent period, because gps signal may be subjected to natural conditions or artificial interference, for example thunder and lightning, solar windstorm etc., if generation war, might artificially launch the GPS curve, use for important control, its reliability is relatively poor relatively.
Summary of the invention
The objective of the invention is: propose a kind ofly based on optical fiber communication, do not rely on the reliable oscillating voltage measuring method of external signal, calculate the phase relation of respectively standing between the voltage by the voltmeter of measuring, and then the oscillation center of definite asynchronous oscillation.
In order to achieve the above object, solution of the present invention is:
A kind of multiterminal oscillating voltage measuring method based on optical fiber communication, the equal erecting device of transformer station at all the circuit two ends that may drop on complicated electric power system asynchronous oscillation center, by selecting one of them transformer station as main website, send synchronous sampling signal by optical-fibre channel to other each stations by main website, the synchronous sampling signal adjustment sampling instant separately of main website is followed in each substation, thereby realize the oscillating voltage synchronized sampling at each station, the voltmeter of respectively standing by synchronized sampling is calculated the phase relation of respectively standing between the voltage, and then the oscillation center of definite asynchronous oscillation.
Main website sends synchronizing signal to each substation in each sampling instant, and each sampling instant is encoded, and the coding of the sampling instant of receiving is replied and returned in each substation to each synchronous sampling signal of receiving, so that the answer signal that respectively returns is distinguished by main website.
Mistiming T between main website calculates each synchronous sampling signal delivery time and the corresponding answer signal in each substation is received constantly
D master n, the moment that each substation calculating synchronizing signal is received and the mistiming T between the answer signal delivery time
The sub-n of d, and this time-delay is uploaded to main website, 2. the main website through type calculates the signal transmission time of each passage and is handed down to corresponding substation.
T
Dn=(T
D master n-T
The sub-n of d) ÷ 2 formulas 2.
Wherein n represents the passage of different substations correspondence.
It is leading main website or hysteresis main website that each substation is calculated the substation sampling instant according to the moment, the channel transfer time-delay of the main website synchronous sampling signal that receives with the mistiming of the sampling instant of self, and finely tunes, keep with the main website sampling instant synchronously.
Each substation is given main website with the positive sequence voltage of our station at each synchronized sampling absolute phase angle constantly, calculates relative phase angle between each substation positive sequence voltage, the position of oscillation center when main website can determine asynchronous oscillation with this by main website.
After adopting such scheme, the invention has the beneficial effects as follows: by near the synchronized sampling of the oscillating voltage of respectively standing the optical fiber communication realization step-out section, can accurately locate the position of oscillation center, simplified the actuating range partition problem between the step-out disconnection devices that are installed near the different stations of step-out section, this method does not rely on the outside clock source is provided, be not subjected to the influence of external interference, reliability is very high.
Description of drawings
Fig. 1 is that system constitutes synoptic diagram;
Fig. 2 is channel transfer Time Calculation synoptic diagram;
Fig. 3 is that the substation sampling interval is adjusted synoptic diagram.
Embodiment
Below with reference to accompanying drawing, technical scheme of the present invention and beneficial effect are elaborated.
The invention provides a kind of multiterminal oscillating voltage measuring method based on optical fiber communication, as shown in Figure 1, to near each station the complicated electric power system step-out section, by selecting one of them station as main website, send synchronous sampling signal by optical-fibre channel to other each stations by main website, the synchronous sampling signal adjustment sampling instant separately of main website is followed in each substation, thereby realize the oscillating voltage synchronized sampling at each station, the voltmeter of respectively standing by synchronized sampling is calculated the phase relation of respectively standing between the voltage, and then the oscillation center of definite asynchronous oscillation.
Main website sends synchronizing signal to each substation in each sampling instant, and each sampling instant is encoded, and the coding of the sampling instant of receiving is replied and returned in each substation to each synchronous sampling signal of receiving, so that the answer signal that respectively returns is distinguished by main website.
Mistiming T between main website calculates each synchronous sampling signal delivery time and the corresponding answer signal in each substation is received constantly
D master n, the moment that each substation calculating synchronizing signal is received and the mistiming T between the answer signal delivery time
The sub-n of d, and this time-delay is uploaded to main website, main website calculates the signal transmission time of each passage and is handed down to corresponding substation.
As shown in Figure 2, suppose that main website has constantly sent a synchronous sampling signal to substation n at T1, substation n receives this signal constantly at T2, has sent return signal constantly at T3, and the return signal of substation n has been received constantly at T4 by main website, then
T
D master n=T
4-T
1Formula 3.
T
The sub-n of d=T
3-T
2Formula 4.
The channel transfer Time Calculation of substation n is suc as formula shown in 5.:
T
Dn=(T
D master n-T
The sub-n of d) ÷ 2 formulas 5.
Wherein n represents the passage of different substations correspondence.
It is leading main website or hysteresis main website that each substation is calculated the substation sampling instant according to the moment, the channel transfer time-delay of the main website synchronous sampling signal that receives with the mistiming of the sampling instant of self, and finely tunes, keep with the main website sampling instant synchronously.
As shown in Figure 3, suppose that main website is Td to the channel transfer time-delay of certain substation, sampling interval is Ts, and T' is less than Ts and satisfies formula 6.:
T'=T
d-n * T
sFormula 6.
Wherein n is integer
When T=T ', the sampling of substation and main website does not need to adjust, as T fully synchronously〉during T ', the substation sampling falls behind the main website sampling, and during T＜T ', the substation leading main website sampling of sampling all needs to finely tune.
Each substation is given main website with the positive sequence voltage of our station at each synchronized sampling absolute phase angle constantly, calculates relative phase angle between each substation positive sequence voltage by main website, the position of oscillation center when main website can determine asynchronous oscillation with this, and this calculates and adopts prior art.
Above embodiment only for explanation technological thought of the present invention, can not limit protection scope of the present invention with this, every technological thought that proposes according to the present invention, and any change of doing on the technical scheme basis all falls within the protection domain of the present invention.
Claims (5)
1. multiterminal oscillating voltage measuring method based on optical fiber communication, it is characterized in that: the equal erecting device of transformer station at all the circuit two ends that may drop on complicated electric power system asynchronous oscillation center, by selecting one of them transformer station as main website, send synchronous sampling signal by optical-fibre channel to other each stations by main website, the synchronous sampling signal adjustment sampling instant separately of main website is followed in each substation, thereby realize the oscillating voltage synchronized sampling at each station, the voltmeter of respectively standing by synchronized sampling is calculated the phase relation of respectively standing between the voltage, and then the oscillation center of definite asynchronous oscillation.
2. the multiterminal oscillating voltage measuring method based on optical fiber communication as claimed in claim 1, it is characterized in that: main website sends synchronizing signal to each substation in each sampling instant, and each sampling instant encoded, the coding of the sampling instant of receiving is replied and returned in each substation to each synchronous sampling signal of receiving, so that the answer signal that respectively returns is distinguished by main website.
3. the multiterminal oscillating voltage measuring method based on optical fiber communication as claimed in claim 1, it is characterized in that: main website calculates each synchronous sampling signal delivery time and each the mistiming T of substation respective acknowledgement signal between the time of reception
D master n, the moment that each substation calculating synchronizing signal is received and the mistiming T between the answer signal delivery time
The sub-n of d, and this time-delay is uploaded to main website, 1. the main website through type calculates the signal transmission time of each passage and is handed down to corresponding substation;
T
Dn=(T
D master n-T
The sub-n of d) ÷ 2 formulas 1.
Wherein n represents the passage of different substations correspondence.
4. the multiterminal oscillating voltage measuring method based on optical fiber communication as claimed in claim 1, it is characterized in that: it is leading main website or hysteresis main website that each substation is calculated the substation sampling instant according to the moment, the channel transfer time-delay of the main website synchronous sampling signal that receives with the mistiming of the sampling instant of self, and finely tune, maintenance is synchronous with the main website sampling instant.
5. the multiterminal oscillating voltage measuring method based on optical fiber communication as claimed in claim 1, it is characterized in that: each substation is given main website with the positive sequence voltage of our station at each synchronized sampling absolute phase angle constantly, calculate relative phase angle between each substation positive sequence voltage, the position of oscillation center when main website can determine asynchronous oscillation with this by main website.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865432A (en) * | 2014-02-20 | 2015-08-26 | 南京南瑞继保电气有限公司 | Method for calculating oscillation center voltage, and device for calculating oscillation center voltage |
| CN110492613A (en) * | 2019-08-23 | 2019-11-22 | 中国能源建设集团广东省电力设计研究院有限公司 | A kind of section Out-of-Step Splitting Systems differentiate control system and method |
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| CN104865432A (en) * | 2014-02-20 | 2015-08-26 | 南京南瑞继保电气有限公司 | Method for calculating oscillation center voltage, and device for calculating oscillation center voltage |
| CN110492613A (en) * | 2019-08-23 | 2019-11-22 | 中国能源建设集团广东省电力设计研究院有限公司 | A kind of section Out-of-Step Splitting Systems differentiate control system and method |
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Application publication date: 20131002 |