CN103178520A - Method, for monitoring power system power oscillation in real time, based on SCADA (supervisory control and data acquisition) data - Google Patents
Method, for monitoring power system power oscillation in real time, based on SCADA (supervisory control and data acquisition) data Download PDFInfo
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- CN103178520A CN103178520A CN201310070909XA CN201310070909A CN103178520A CN 103178520 A CN103178520 A CN 103178520A CN 201310070909X A CN201310070909X A CN 201310070909XA CN 201310070909 A CN201310070909 A CN 201310070909A CN 103178520 A CN103178520 A CN 103178520A
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Abstract
The invention relates to method, for monitoring power system power oscillation in real time, based on SCADA (supervisory control and data acquisition) data. The method includes the steps of firstly, calling a real-time database interface of an EMS (enhanced message system) to obtain an active value of power equipment; secondly, calling an oscillation feature iterative function, inputting new data on the basis of a previous state, calculating feature quantity of active oscillating of one grid equipment, comparing with a preset fixed value, and returning equipment state; thirdly, detecting whether opposite terminal equipment of a local terminal is marked to be in an oscillating state or not, and if so, judging that power oscillation occurs in a power system; and fourthly, if power oscillation occurs, calling a warning interface of the EMS system for warning. By the method, data accuracy is improved, practicality level is improved, investment is saved greatly, and convenience and practicality are achieved.
Description
Technical field
The present invention is a kind of method based on the vibration of SCADA data Real-Time Monitoring Power Systems, belongs to the innovative technology based on the method for SCADA data Real-Time Monitoring Power Systems vibration.
Background technology
In electric power system, when generator is powered through the transmission line paired running, persistent oscillation between generator amature may appear under some running status, cause that simultaneously on busbar voltage and transmission line, corresponding vibration occurs power, affected the normal conveying of power, when serious, electric power system will lose synchronizing direct to the serious consequence of collapse.Because the frequency of this persistent oscillation is very low, generally between 0.1～2.5Hz, usually be referred to as low-frequency oscillation, because direct cause relates to waving between synchronous generator rotor, and show as the fluctuation of electric power, therefore be called again electromechanical oscillations or power oscillation.
How the stable and safety of power oscillation serious threat electrical network is in operation and real time monitoring is carried out in the generation of vibration is significant.Solution in the past is to utilize the wide area measurement technology, namely use PMU(phasor measurement unit, phasor measurement unit) data are carried out online dynamic security analysis, such as: use the Prony algorithm directly to calculate the oscillation characteristicses such as frequency, amplitude, initial phase and decay of low-frequency oscillation of electric power system signal, and then judge whether system low-frequency oscillation is occuring.
Use the vibration of PMU data monitoring Power Systems to have in actual applications following problem and shortage:
1) PMU layouts limitedly, and monitoring range is incomplete
SCADA (Supervisory Control And Data Acquisition, be that data acquisition is controlled with supervision) system, by a kind of telemechanical device RTU (the Remote Terminal Unit that is arranged on power plant or transformer station, remote terminal unit) gather electric network data, the real-time monitoring system that is current all power schedulings is EMS(Energy Management System, EMS) data collection architecture that adopts of system.So, all factory stations of SCADA data cover EMS system access.
Opposite with RTU, PMU is not the conventional harvester that the factory station is built, to need special the deployment, generally only be deployed in the factory station that stable problem is relatively given prominence to, although recent domestic electric power system strengthens investment, accessed a large amount of PMU devices, but that PMU layouts is limited, the problem that monitoring range is incomplete is still very outstanding.
2) maintenance is not in place, and the data accuracy rate is not high
Because PMU is the optional equipment that remote data gathers, little on the impact of electrical network real time execution, operations staff's attention degree of the end of stand is lower, and there is deviation in inadequate and operation to the understanding of device, tends to cause the problem of data.
The main website end often accesses the PMU data by building special WAMS (Wide Area Measurement System, wide area monitoring system) system, is difficult to integratedly with the EMS system, and these systems lack the professional usually, and Maintenance Difficulty is to put in place.
3) technical sophistication, practical difficulty is large
PMU needs deployment devices at the station end, the primary equipment connection side who stands with factory can obtain collection capacity, also need set up special passage is connected with main station system, be equivalent to redeploy a complete data collection architecture of cover, and main website also needs to build special-purpose WAMS system data processed and analyzed, and technology is very complicated.
Comparatively complicated algorithm is adopted in the applied analysis of main station system, the analysis and research of current research low-frequency oscillation are very many, but all must be take the integrality of data and accuracy as the basis, but just because of the disappearance of this respect causes the various theories of algorithm finally can't true(-)running, add system the user experience and integrated aspect existing problems, often be difficult to practical.
4) implementation cost is too high
The wide area monitoring system need to be built data collection architecture again, and the factory station needs the special PMU of deployment device, and main station system is used complicated, must cause implementation cost greatly to increase.
Summary of the invention
The object of the invention is to consider the problems referred to above and a kind of raising data accuracy rate is provided, improving practical level, and the method based on the vibration of SCADA data Real-Time Monitoring Power Systems of greatly reducing investment outlay.
Technical scheme of the present invention is: the method based on the vibration of SCADA data Real-Time Monitoring Power Systems of the present invention includes following steps:
1) call the real-time bank interface of EMS system, obtain the meritorious value of power equipment;
2) call the oscillation characteristics iteration function, the new data of input on the basis of previous state are calculated the meritorious characteristic quantity that swings back and forth of certain grid equipment, compare the state of rear Returning equipment with the definite value that sets in advance;
3) whether the opposite equip. of check local terminal also is identified as oscillatory regime simultaneously, if so, thinks that power oscillation is occuring in electric power system;
4) if system's generation power oscillation is called the alarm interface of EMS system, send alarm.
Above-mentioned steps 1) described power equipment comprises transmission line, generating set, transformer.
Above-mentioned steps 2) the oscillation characteristics iteration function described in is a state iteration function.
Above-mentioned steps 2) equipment state described in comprises: starting of oscillation, the end of vibrating, vibrate, normal.
Above-mentioned steps 3) check in is intended to get rid of the erroneous judgement that the individual data acquisition problems causes.
Above-mentioned steps 4) in, if system's generation power oscillation is called the alarm interface of EMS system, send voice, short message alarm.
Above-mentioned steps 4) in, during alarm, upper significant alarm window is transferred database interface, writes alarm record and dependent event record, is used for the curve of analysis event.
The present invention compared with prior art has following beneficial effect:
1) the present invention uses the SCADA data, and exploitation realizes the real time monitoring function of Power Systems vibration, solves the problem that WAMS system monitoring scope is incomplete, the data accuracy rate is not high.
2) the present invention directly in the EMS system exploitation realize the real time monitoring function of power oscillation, the data acquisition unit phasor measurement unit (PMU) and the WAMS (WAMS) that do not need deployment-specific, namely can realize Power Systems vibration Real-Time Monitoring, the simplification technology realizes, improve practical level, and save great amount of investment.
3) the present invention uses the mode of state iteration function, only need to use the plant capacity currency can calculate the plant capacity state, do not need to preserve and process the data of a time window, solved the problem that large-scale data is preserved and sweeping scheme exists in the past.
4) the present invention has only used the most conventional RTU/SCADA data, has covered the electrical network monitoring range of power dispatching station, and the power oscillation monitoring range is expanded to maximum, has eliminated the blind spot that the PMU device is layouted and entirely do not brought.
5) the technology of the present invention realize simple and practical, can be directly in the EMS system Application and Development, the retrofit work amount is very little, adds that EMS system and data maintenance thereof are generally fairly proper, so that this technology is easier to is practical.
The present invention is a kind of convenient and practical method based on the vibration of SCADA data Real-Time Monitoring Power Systems.
Description of drawings
Fig. 1 is oscillation characteristics iteration function flow chart of the present invention;
Fig. 2 be the present invention is based on SCADA data Real-Time Monitoring Power Systems vibration method realize schematic diagram.
Embodiment
The below is a preferred embodiment of the present invention, and features, objects and advantages of the invention can be found out from the explanation of embodiment and accompanying drawing.
1, this method has disclosed a kind of oscillation characteristics iteration function, is described as follows:
Fig. 1 is oscillation characteristics iteration function flow chart, this characteristic function is a state iteration function, the new data of input on the basis of previous state are calculated the meritorious characteristic quantity that swings back and forth of certain grid equipment, compare the state of rear Returning equipment with the definite value that sets in advance.
The input of function:
(P k , t k ), wherein
P k The meritorious value of equipment,
t k To measure the time that gathers.
Judge whether extreme point of current value,
P k ’ ·P k-1 ’ <0 (1)
Wherein:
P
k ’=
If this point is extreme point, formula (2), formula (3) are calculated amplitude and the cycle that swings:
H=P
m
-P
m-1
(2)
T=(t
m
-t
m-1
)*2 (3)
Wherein H is the amplitude that swings, and T is pendulum period.
In figure
H 〉=C H ﹠amp; ﹠amp; T＜=C T Judge whether amplitude and cycle be out-of-limit, out-of-limitly this point is considered as the extreme point that vibrates, the counting i of vibration extreme point adds 1.
Wherein
C H With
C T It is the limit value of setting.
I is the beautiful variable of this equipment state quantity measurement of judgement, and i is normal less than definite value, and i represents to vibrate greater than definite value, represents starting of oscillation if i equals definite value, and vibration finishes or normally returns 0.
Even i reaches limit value, in limits, similar unit is meritorious draws high suddenly the mistake alarm that causes to the slope that also must judge the vibration axis to filter, and the axis slope is suc as formula shown in (4).
K
zd
=(P
i
-P
i-1
)/(t
i
-t
i-1
) (4)
Wherein:
K zd The axis slope,
P i That up-to-date extreme point is gained merit,
P i-1 That the starting oscillation extreme point is meritorious,
t i , t i-1 It is time corresponding to extreme point.
The characteristics of oscillation characteristics iteration function are the data that do not need to preserve a time window, use meritorious currency can return to the state that corresponding device measures, and are very suitable for the scanning of large-scale data.Because only the characteristic quantity that measures curve is calculated judgement and memory, system resource overhead is very little, and efficient is very high, can be by continuous iteration in real-time system, and the current state that reflection equipment measures; This function also is fit to the historical data curvilinear characteristic by the judgement of established rule very much, and general analyzes equipment measures the situation of change in a period of time.
The method of 2, vibrating based on SCADA data Real-Time Monitoring Power Systems
The method is used " oscillation characteristics iteration function " Application and Development in the real-time system of EMS, realize Power Systems vibration real time monitoring function, as shown in Figure 2, this function realizes comprising five processes, is respectively peek, call, return, check confirmation and send alarm.
(1) peek
Program obtains the meritorious measurement currency of generator table, interchange line end endpoint table, transformer table by the real-time bank interface of SCADA.The recording number and may reach up to ten thousand even tens thousand of an of section of whole network equipment, these records need to set enough memory headrooms to be processed, and small-scale application can be passed through condition reduction equipment scope or artificial pre-defined allocation list.
(2) call
Input the meritorious measuring value of each equipment and current time and call respectively the oscillation characteristics iteration function, the meritorious curve of cyclical fluctuations characteristic value of computing equipment, thereby the state of judgement corresponding device, these features and state go on record, and are used for next iteration.
(3) return
The oscillation characteristics iteration function returns to the current state of each equipment successively, comprising: normal, starting of oscillation, the end of vibrating, vibrate, these states will be used to judgement and the verification of whole system state afterwards.
(4) judgement
If the state of all devices belongs to normally, electric power system is identified as normally, if find have equipment to belong to oscillatory regime, judges that vibration has occured in electric power system.
(5) alarm
Electrical network sends Real-time Alarm when vibration occurs, and comprising: voice, alarm window and short message alarm, and simultaneously to vibration logout warehouse-in, so that on-the-spot or consult curve and relative recording afterwards.
3, result verification
Develop the low-frequency oscillation real time monitoring program based on the SCADA data that realizes by this method, since putting into operation in EMS system of south electric network power scheduling control centre (the south net is total to be transferred) in 2006, low frequency each time
develop the low-frequency oscillation real time monitoring program based on the SCADA data that realizes by this method, since putting into operation in EMS system of south electric network power scheduling control centre (the south net is total to be transferred) in 2006, low-frequency oscillation event is each time all accurately sent alarm, as: 8.29 low-frequency oscillation events in 2006, 2.26 low-frequency oscillation events in 2007, 2008 4.21, 8.25 low-frequency oscillation event, 5.07 higher-order of oscillation events in 2010, 5.28 low-frequency oscillation, 9.24 low-frequency oscillation events in 2011, 11.19 low-frequency oscillation event, in the events such as 2.28 low-frequency oscillations in 2012, sent in real time alarm to the dispatcher.
In sum, the present invention's technical characterictic unlike the prior art is:
1) before this, all monitor that the realization of Power Systems vibration all is based on the PMU data.The present invention uses the SCADA data, and the theoretical method of power oscillation characteristic value is extracted in design by curvilinear characteristic, and exploitation has realized the real time monitoring function of Power Systems vibration, solves the problem that WAMS system monitoring scope is incomplete, the data accuracy rate is not high.
2) the state iteration function of the present invention's proposition, this function only need to use the plant capacity currency can calculate rapidly the plant capacity state, do not need to preserve and process the data of a time window, be very suitable for the scanning of large-scale equipment power rating data, solved the problem that large-scale data is preserved and sweeping scheme exists in the past.
3) method of the invention process comprises peek, calls, returns, checks and confirm and send the alarm process, the requirement that has considered the identification vibration and avoided reporting by mistake, technology realizes simple and practical, can be directly in the EMS system Application and Development, the retrofit work amount is very little, is easier to practical.
Claims (7)
1. method based on SCADA data Real-Time Monitoring Power Systems vibration is characterized in that including following steps:
1) call the real-time bank interface of EMS system, obtain the meritorious value of power equipment;
2) call the oscillation characteristics iteration function, the new data of input on the basis of previous state are calculated the meritorious characteristic quantity that swings back and forth of certain grid equipment, compare the state of rear Returning equipment with the definite value that sets in advance;
3) whether the opposite equip. of check local terminal also is identified as oscillatory regime simultaneously, if so, thinks that power oscillation is occuring in electric power system;
4) if system's generation power oscillation is called the alarm interface of EMS system, send alarm.
2. the method based on SCADA data Real-Time Monitoring Power Systems vibration according to claim 1, is characterized in that above-mentioned steps 1) described power equipment comprises transmission line, generating set, transformer.
3. the method based on SCADA data Real-Time Monitoring Power Systems vibration according to claim 1, is characterized in that above-mentioned steps 2) described in the oscillation characteristics iteration function be a state iteration function.
4. the method based on SCADA data Real-Time Monitoring Power Systems vibration according to claim 1, is characterized in that above-mentioned steps 2) described in equipment state comprise: starting of oscillation, the end of vibrating, vibrate, normally.
5. the method based on SCADA data Real-Time Monitoring Power Systems vibration according to claim 1, is characterized in that above-mentioned steps 3) in check be intended to get rid of the erroneous judgement that the individual data acquisition problems causes.
6. the method based on SCADA data Real-Time Monitoring Power Systems vibration according to claim 1, is characterized in that above-mentioned steps 4) in, if system's generation power oscillation is called the alarm interface of EMS system, send voice, short message alarm.
7. the method based on the vibration of SCADA data Real-Time Monitoring Power Systems according to claim 1, is characterized in that above-mentioned steps 4) in, during alarm, upper significant alarm window, transfer database interface, write alarm record and dependent event record, be used for the curve of analysis event.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109347119A (en) * | 2018-09-21 | 2019-02-15 | 全球能源互联网欧洲研究院 | A kind of electricity grid oscillating suppressing method and device based on virtual synchronous generator |
| CN110741615A (en) * | 2017-04-20 | 2020-01-31 | 沙特阿拉伯石油公司 | Securing SCADA network access from a remote terminal unit |
| US11288378B2 (en) | 2019-02-20 | 2022-03-29 | Saudi Arabian Oil Company | Embedded data protection and forensics for physically unsecure remote terminal unit (RTU) |
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| CN101917003A (en) * | 2010-07-29 | 2010-12-15 | 东南大学 | Small interference oscillatory stability decomposed model analysis method for electric power system |
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| CN101944766A (en) * | 2010-06-01 | 2011-01-12 | 中国电力科学研究院 | Operation and safety monitoring simulation system for power system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110741615A (en) * | 2017-04-20 | 2020-01-31 | 沙特阿拉伯石油公司 | Securing SCADA network access from a remote terminal unit |
| CN109347119A (en) * | 2018-09-21 | 2019-02-15 | 全球能源互联网欧洲研究院 | A kind of electricity grid oscillating suppressing method and device based on virtual synchronous generator |
| CN109347119B (en) * | 2018-09-21 | 2022-02-08 | 全球能源互联网欧洲研究院 | Virtual synchronous generator-based power grid low-frequency oscillation suppression method and device |
| US11288378B2 (en) | 2019-02-20 | 2022-03-29 | Saudi Arabian Oil Company | Embedded data protection and forensics for physically unsecure remote terminal unit (RTU) |
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