CN1110838A - In-line monitoring and prevention control system with stable transient for power system - Google Patents
In-line monitoring and prevention control system with stable transient for power system Download PDFInfo
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Abstract
A self-adaptive emergency control system can continuously update decision table according to real working condition of electric power system, which is locally acquired and received periodically from energy management system. A extended equal area criteria (EEAC) is used for in-line determining emergency control measures to expectant failures and the measures are stored in decision table. When failure occurs, local or regional control measure is searched out from the decision table and is implemented by correspondent controller.
Description
The invention belongs to the electric power system on-line transient stability monitors and the prevention and control field.The stabilization of power grids is very big to the influence of national economy and social civilization.The transient stability analysis method of current unique practicality, i.e. numerical integrating, not only extremely slow and can not provide the stability index quantitatively, also can't carry out sensitivity analysis.This brings very big difficulty just for planning, operation and the control of electrical network, and particularly online stability analysis and emergency control aspect are still blank basically.The unremitting effort that China and foreign countries' electric power circle is done for the exploitation direct method is but failed real successful for a long time.
By the EEAC(expansion homalographic criterion of present patent application person invention in 1986) method is unique so far strict proof that obtains, and can resolve the direct method of finding the solution.
EEAC has experienced static (SEEAC starts from 1986), dynamically (DEEAC starts from 1991) and integrated (IEEAC starts from 1993) three phases.About the first two stage, promptly more than the 30 piece of international paper of SEEAC and DEEAC extensively quoted both at home and abroad and followed the tracks of, is chosen as external doctoral candidate's teaching material, by the internal authority works with special chapter introduction.EEAC1993 formally is on active service in the EMS of northeast electrical network, becomes the first that International Power circle on-line transient stability analytical industry is used.The EEAC that counts voltage regulator and quick closing valve is applied to systems organization by Electricite De France; The second generation expert system that expert system technology combines with the numerical algorithm that comprises EEAC is adopted by the Zhejiang pilot scale.
For estimation of transient stability, we can press required model integration earlier in the multimachine space, the corner track is shone upon by PCOI again, become the stability of OMIB system when examining or check on each image plane.The task of the critical unstability pattern of identification and the calculation stability limit just is converted into the problem of each map subsystem critical level of comparison in multimachine system.Because the uniqueness and the approximate analysis existence of solution of map OMIB system path of integration, EEAC has the characteristic of direct method.EEAC depends on critical unstable track, is applicable to the electric power system of nonautonomy matter, and does not belong to the Liapunov theoretical category.
EEAC algorithm transient security analysis software moves on the standby host of the automated system (two-shipper VAX11/785) introduced of electrical network northeastward.Under the real time environment in control room, can on the Aydin display terminal, directly operate and show with result screen.Its software support is VAX/VMS operating system and HABITAT rdal-time DBMS.The BACKUP software timing is delivered to the real time data of SCADA on the standby host from main frame, the operation in per 10 minutes of SE software once, the whole network is carried out state estimation, limited by the telecontrol information amount, the current state estimation range can't cover northeast the whole network, and present may observe island comprises about 235 nodes of the part of Liaoning, Jilin and Inner Mongol, 307 branch roads, 56 machines, all the other are not gone up the island part and carry out equivalence.EEAC software is obtained real time data by the interface software with SE, carries out the transient security analysis, and its result is clear on designed output picture to be expressed intuitively.The major function that has now realized is:
1, can carry out online trend and calculate, the real time execution situation of system can be presented on the tidal current chart, monitor for the dispatcher.
2, can choose the position of fault wantonly on line chart and type is carried out the transient security analysis, generator model can use E ' constant earlier, and load model is selected constant impedance for use.
3, can calculate critical clearing time (CCT) under the simple faults such as various symmetry/unsymmetrical short-circuits and broken string fast, the limit trend on critical machine limit output (Pmsl) and the specified interface.
4, designed two kinds of operational modes and selected for use arbitrarily for users of service, i.e. research mode and cyclic pattern, research mode can manually be carried out single fault point and analyzed, and also can carry out the whole network point by point scanning; Cyclic pattern then is that self-starting is carried out scanning analysis to a forecast accident collection.
5, analysis result can forms mode and the bar mode on picture, export, provide the system stability condition information intuitively, also can export by printer prints.
6, have off-line and check software, the data of a certain moment section can be preserved, exported, carry out off-line research and check.
Monitor and analysis that for ease of safety on line good man-machine interaction interface, shirtsleeve operation and output intuitively must be arranged.Designed ten multi-pictures for this reason, the information that is necessary is provided for the user of service.Can be divided into four parts by its function:
1, the EEAC key frame is the core picture of operation control, can select to enter all other picture on this picture, can the control program operation, select account form and fault mode and display routine execution state information.(see figure 1).
2, import the control picture and comprise pictures such as static data control, dynamic data control, the input of single fault message and formation bug list.
3, output information picture comprises the circuit tidal current table, nodal information output, automated security scan output (node scan and branch road scanning), the generator limit pictures such as rod figure of exerting oneself.
4, online trend and process monitoring image comprise system's line chart, pictures such as EEAC operation information, state estimation operation information and SAVECASE information.
But also there are following problem in SEEAC and DEEAC: (1) can not reflect plurality of pendulums stability.(2) can not handle isolated stable region phenomenon (numerical integrating is not accomplished yet).(3) handle not ideal enoughly for the precision and the contradiction between speed of head pendulum and two pendulum stability analyses, the robustness of method is not enough.(4) for the processing of complex model, the problems referred to above are more outstanding, to such an extent as to EEAC no longer the logarithm value integration method have the obvious speed advantage, so just can not be to grid stability in-service monitoring and control, its practicality is restricted.
Still not ideal enough with dynamic EEAC algorithm to symmetric fault error under the electrical network E ' model of northeast:
The side's of fortune node is counted correct warning of mistake point and is refused to submit wrong report
One 185 19 9 10 6
2 185 25 8 17 8
Illustrate: the correct warning refers to that mistake point reports to the police: refusing to submit is mistake point warning, and reporting by mistake is little error point warning, and mistake is with | (CCT
e-CCT
s)/CCT
a|＞10% is criterion.Referring to Xue Yusheng etc. " EEAC is the on-line implement among the electrical network EMS northeastward ", CSEE's collection of thesis, 1992.
IEEAC is on the experience of China and foreign countries' engineering practicability, the new results under the guidance of EEAC theoretical research result.Purpose is to solve the problem that exists in the EEAC algorithm that has distributed, makes online transient analysis perfect in shape and functionization.
Though IEEAC obtains practical application in the China Power engineering, the relevant technological approaches and the key of enforcement did not all disclose.Technology to external output still is limited to the DEEAC stage.
Fig. 1-Fig. 4 has illustrated the graph of a relation of technical field and the technical background of existing EEAC: Fig. 1 for EEAC and the existing EMS of electric power system.Fig. 2 is specializing of Fig. 1, and Fig. 3 is existing EEAC software main flow chart, and Fig. 4 is its nucleus module block diagram.
The left side is that SCADA, real-time status are estimated and dispatcher's trend and static security analysis software among Fig. 1,2.Right-hand component is TSA/TSPC and research module thereof.Estimate from real-time status that ETNET copies by the Mapping module and get whole real time datas and network parameter, extract the dynamic parameter of generator from the DS module.For the operation planning purpose, a learning database can be set, thereby estimate its transient security so that revise service conditions.
The transient stability analysis module is a core with TSA/TSPC stability analysis database, and all software adopts the establishment of ESCA stipulations fully.It comprises three database NETMOM, PFMOM and DYNMOM.Network parameter and on off state, generating and load provide by NETMOM, and it is from RTNET.Have related parameter and admittance battle array and factor table thereof that trend is calculated usefulness all are placed in the PFMOM database, and trend result is placed among the PFMOM, also is transmitted back among the NETMOM during calculating.The all input and output results of generator dynamic parameter and EEAC all are placed among the DYNMOM.
List of references sees Xue Yusheng etc. " new algorithm of power system stability safety analysis-about the collection of thesis (two) of EEAC algorithm, 1990-1994 ", Power Automation Inst., Ministry of Electric Power.
The purpose of this invention is to provide a kind of electric network data of gathering by the cycle, the maximum duration that the on-line analysis electric power system allows various faults to continue, the timely new method that shows the stability margin of electric power system to the dispatcher.The stable region that provides in the injecting power space makes the dispatcher can be as monitoring whether generator transships the transient stability of surveillance intuitively, when potential unstability is dangerous, can clearly tell the dispatcher should be how under the prerequisite of guaranteed output balance to eliminate this class danger.
The technology of the present invention solution is that the stringency that the reservation multimachine system of the analyticity of SEEAC (or accurate analyticity) and DEEAC is stablized necessary and sufficient condition is combined, and provides initial value and approximate sensitivity coefficient with the former to the latter.The rapidity of the DEEAC that four step platform labor are launched and the accuracy of variable step integration track PCOI mapping combine; Mechanism by the theoretical multimachine factor that discloses of EEAC and the influence of complex model factor map over time variation solves the problem of unstability pattern with the fault clearing time variation; The knowledge process ability of the dark exhibition knowledge of EEAC and expert system technology combined further improve computational efficiency; Discern potential isolated stable region phenomenon; To handle the IEEAC(CM of classical model) and the IEEAC(DM of processing complex model) combine; Absolute rating under the complex model is regarded as correction to the classical model result.Concrete main points are as follows:
It electric network data (as voltage, electric current, the power signal of generator, load, bus and branch road) is gathered, the SCADA system of conversion, supervision, electric power system is carried out at line model realize to the on-line analysis of power system transient stability with to stablizing the energy management functionality of prevention and control on the basis in various application of software data storehouse of simulation analysis.It is characterized in that utilizing integrated expansion homalographic criterion (IEEAC) to provide online transient stability analysis and prevention and control decision-making for EMS.Its method and step are: the various results that (1) obtains with the IEEAC under the classical model (CM) are as the initial condition of the IEEAC under the complex model.(2) concerning any designated model, IEEAC comprises SEEAC, DEEAC and three links of integration check.SEEAC supposes that two groups of this complementation innerly separately obtain CCT initial value t for the desirable people having the same aspiration and interest
SE C, revise corresponding error by SEEAC again and get t
DE C, the integration (or platform labor progression multistep is launched) under instructing with the PCOI mapping at last judges whether to have more serious plurality of pendulums unstability and eliminated mistake, obtains t
IE C(3) under classical model (CM), | t
IE C-t
DE C|/t
DE CWhen little, the critical excision angle δ that provides with DEEAC
DE CThe δ that provides with SEEAC
SE CPoor (or with corresponding η or t
c) reflect non-people having the same aspiration and interest degree when claiming (or the variation) σ in the group, and think that the complexity of its value and model has nothing to do, and less than certain threshold value, then directly uses formula δ as if σ
DE C(DM)=δ
SE C(DM) δ
DE C(CM)/δ
SE C(CM) conversion obtains the δ under the complex model (DM)
DE CAnd then can get t (DM),
DE C(DM).Integration without any need for the multimachine complex model does not need to do the integration check yet.(4) if greater than this thresholding, then the critical OMIB of the disturbed track of complex model multimachine under classical model with this reduced value correspondence does the PCOI mapping to ask for stability margin η
DE(DM), the DEEAC that launches with 4 step platform labor again asks for η by the sensitivity coefficient (single order and second order) that perturbation obtains under the classical model
DE(DM)=0 o'clock δ
DE CAnd then obtain t (DM),
DE C(DM).(5) work as t
IE C(CM) and t
DE CWhen (CM) falling far short, directly make mute time τ=t
SE C(DM), complex model being made integration sounds out to ask for t
IE C(DM).(6) only just need to check plurality of pendulums unstability under the complex model under following situation: corresponding classical model is down for the plurality of pendulums unstability or when having quick closing valve to control.(7) to SEEC(DM), the E ' of certain group's (as S group) equivalent machine
QsE by each machine
QsThrough Mi weighted mean E
QSAnd X
Qs=[∑ (X
Qi)
-1]
-1Calculate, make E ' by the model requirement again
QsRemain unchanged or variation under equivalent automatic voltage regulator control.(8) to DEEAC(DM), E '
qGenerator model constant or that change all is treated to the E that upgrades piecemeal
QConstant model, nonlinear-load and dynamic load all are treated to the constant-impedance load that upgrades piecemeal.Therefore can ask δ i with big step-length platform labor series expansion by the equivalent classical model that upgrades piecemeal
I adopts structure-preserved admittance battle array, and with small step long process controller dynamically and induction motor dynamic.Upgrade the E of injection rate and each machine in each big step-length end of a period place
QiThe machine network interface is taken at the equivalent impedance X in the generator equivalent circuit
QiThe interior nodes place of back.Press integration step each machine δ value correction E at the end
QValue can be found the solution by linear equation.When (9) the equivalent angle that becomes the OMIB map when DEEAC is returned, ask for the permanent sine parameter of electronic rate, and establish mechanical output and no longer change, come the stability margin of calculation stability track by multimachine δ i.(10) model that IEEAC adopted in principle should be identical with the complexity of customer requirements.(11) for seeking the initial candidate group, earlier with variable step platform labor series expansion to 2
s, if the maximum angle in the whole period then continues to be deployed into 3 between (140 °, 300 °)
sIf still unstability is not then used τ=0.7
sAgain emulation once, in order to avoid τ=1
sFall into isolated stable region (ISD).(12) when integration check obtain the neutrality track after, (t, δ) sequence is divided into homology group with the disturbed track of each machine by the extreme point coordinate at each merit angle.By each group correspondence the time become the time change trend of OMIB map in each time swung and judge the possibility whether ISD is arranged.If have, then more once with less τ value integration, to eliminate the influence of ISD.
The performing step of prevention and control is: (1) utilizes data acquisition system will be dispersed in electric power system real time information everywhere and is aggregated in the real-time data base of EMS, (2) utilize state estimation software that bad data is deleted, and extrapolate the work information that lacks, (3) calculating of TSA can periodically start automatically, also can start behind the electric power system generation Action Events or under the requirement the dispatcher, so that forecast failures all in the incident table is calculated one by one.
EEAC provides the stable region that limit power surrounded (TSD) by each generator (group) in the injecting power space, the latter can represent with bar intuitively, the actual power power and the TSD of each generator (group) are compared, if the generated output without any a machine (group) runs off TSD, then the dispatcher needn't carry out any adjustment, and electric power system can be born these forecast failures and non-unstability; Otherwise the dispatcher just should consider the power of each out-of-limit machine (group) is reduced to respectively in the limiting value, to guarantee transient security.Its application scenario can be that on-line operation or operation planning also can be the planning applications of off-line; Its realization can closely be associated in together with EMS, also can be in the work station of special use.
Below with embodiment the present invention is described in detail with reference to the accompanying drawings.
Fig. 1 is the graph of a relation of EEAC and the existing EMS of electric power system.The dotted line left side is that SCADA and real-time status estimate and the static security analysis software section that the right side is an EEAC software.Adopt commercial HABITAT database and man-machine interaction (MMI) software among the SCADA, external system also can be behind dynamic equivalent be simulated with duty values such as equivalent machine of several equivalent branch roads and one.Real time data deposits the application of software data storehouse in behind the state estimation software analysis, regularly or be mapped to the stability analysis database under operator command, the data that minority is inconsiderable can be taken from planned value by man-machine interaction mode.EEAC can carry out stability analysis to the actual condition of stability analysis database reflection, also can carry out stability analysis to the research operating mode (existing in the research data base) that is provided by dispatcher's trend.
Fig. 5 is the IEEAC schematic flow diagram (asking for limiting quantities such as CCT and limit generated output) towards analysis and prevention and control type.
(1) stability to (10) frame analysis of classical model.Wherein (1) frame at elimination CCT greater than 1
sExample the time, can reliably avoid τ=1
sThe danger that brings when being arranged in ISD just (seeing the 1-(11 of technical scheme) item).The initial formation of (2) frame ICMR(motor critical level) lined up from big to small in each machine merit angle, and by wherein maximum angular clearances with system be divided into complementary two groups (corresponding to image plane R
1 0).Then to R
1 0Obtaining initial CCT(with the DEEAC of SEEAC and 4 step platform labor expansions is t
DE CO).(3) frame is at R
1 0Equivalent angle arrives the moment of its dynamic saddle point, and each machine merit angle is arranged in Q from big to small
1, press Q again
1Middle three maximum angular clearances define three candidate's image plane R
1 g, g=1,2,3.(4) frame gets t with SEEAC
SE C.g(E '), (5) frame is revised with DEEAC, obtains corresponding t
DE Cg(E '), g=1,2,3.(6) frame is got the t that minimum value is a multimachine system
DE C(7) frame is discerned the time range degree σ (referring to technical solution 1-(3) of critical OMIB map).(8) frame is with t
DE c(E ') is the platform labor progression search t of initial value with variable step
IE cIf obtain the multimachine track of first pendulum unstability, then to critical R
1 gAnd corresponding to the R in gap, big angle more
1Mapping.DEEAC by the 4 step platform labor series expansion modes that perturb asks for single order and the second order sensitivity of stability margin to τ again, to assist t
IE cThe search of (E ').(9) frame utilizes deep knowledge to judge whether possibility (referring to the technical solution 1-(12) item of potential ISD).If above-mentioned possibility is arranged, then makes τ=0.9t
IE cAgain integration once so that cross over ISD.If less than certain thresholding (as 10%), then needn't do (8) and (9) frame.
(10) frame condenses the two machine systems that become complex model with the PCOI conversion with the multimachine system of complex model, then latter's integration is found the solution.But SEEAC(DM) can not handle the network-type complex model that comprises load.(11) frame is at first down pendulum unstability of E ' model and the less situation of σ value.This moment the t under the complex model
DE cCan be directly by SEEAC(DM) result's conversion and get (referring to the 1-(3 of technical solution) item).Last t as a result
IE C(DM) can directly get t
DE c(DM) and do not need to carry out the integration of multimachine system complex model.(14) to first down pendulum unstability of (15) frame processing E ' model and the bigger situation of σ value.(14) frame in the multimachine space to the complex model integration, and the critical R under E ' model simultaneously
1 cDo mapping ((15) frame), (shakiness) just can stop integration when equivalent angle is returned (being judged to stable) or arrived dynamic saddle point.The nargin of stable map is by the 1-(9 of technical solution) described method calculating.Sensitivity coefficient (seeing the 1-(4 of the technical solution) item that sensitivity analysis can adopt the DEEAC numerical value perturbation of 4 step platform labor series expansion modes under the classical model to obtain).Map to shakiness also has or not bigger angular clearances in the dynamic saddle point of the Ying Zaiqi place inspection multimachine track, then also should be to the R of correspondence if having
1The plane is done mapping and is asked for this candidate's critical condition.This moment I
IE c(DM) be minimum value wherein.
Have only when classical model to be down the plurality of pendulums unstability, perhaps quick closing valve just needs to consider plurality of pendulums destabilization problems (seeing the 1-(6 of the technical solution) item complex model under later on again under the situation of Open valve).(16) handles plurality of pendulums destabilization problems under this each situation to (18) frame, and (19) frame is handled the ISD problem under the complex model.
Online static security analysis function extensively realizes in the EMS in worldwide, but said system then is unique online transient security analytical system that obtains the engineering practicality.The present invention makes the prevention and control ability of electric power system bring up to the dynamic security level from the static security level for the EMS (EMS) of electric power system provides a kind of computer program.According to the actual condition formula person research operating mode according to weather report that the various quantity of states and the measurement amount of electric power system online acquisition reflected, calculate the critical clearing time (CCT) and the limit power of various faults fast with integrated EEAC.Can provide neutrality track under various complex models and the complicated disturbance scene and critical unstability track, unstability pattern sub-clustering situation to the dispatcher in addition, information such as stable region that maximum voltage falls, the critical generated output of various sensitivity coefficient, generator injects the space and interface stream limit power with the situation of change of physical fault mute time, disturbed track.With example or touring scan mode one by one, the EEAC module can be by real-time mode or research mode work.It not only can provide CCT, also can represent stability limit with the parameter that the operations staff can observe and control.The TSD that injects the space is exactly example so, and its makes complicated TS task become as monitoring that busbar voltage is simple.When if system develops towards dangerous direction, it will warn this danger to the operations staff, and tells them how to take preventive measures system is moved to the state of stability and safety.
Through electric power enterprise operations staff conscientiously on probation and investigation more than a year, prove that this method is helpful to the operations staff.The precision of software, robustness, friendly interface and speed are moved and the praising highly of designer.
Following table has provided to the results of calculation of 16 electrical networks in the topped whole nation almost, no matter all high to the computational accuracy of first pendulum stability or plurality of pendulums stability.Its computational speed then reaches 2 orders of magnitude soon than the numerical analysis method of routine, also promptly calculates 50 E ' of electro-mechanical force system with the ALPHA work station
qCCT under the constant model, every example on average was no more than for 3 seconds, satisfied the needs of on-line analysis.
Claims (3)
1, a kind of in-service monitoring of electric power system transient stability and computer system of prevention and control of being used for.It electric network data (as voltage, electric current, the power signal of generator, load, bus and branch road) is gathered, the SCADA system of conversion, supervision, electric power system is carried out at line model realize to the on-line analysis of power system transient stability with to stablizing the energy management functionality of prevention and control on the basis in various application of software data storehouse of simulation analysis.It is characterized in that utilizing integrated expansion homalographic criterion (IEEAC) to provide online transient stability analysis and prevention and control decision-making for EMS.Its method and step are: the various results that (1) obtains with the IEEAC under the classical model (CM) are as the initial condition of the IEEAC under the complex model.(2) concerning any designated model, IEEAC comprises SEEAC, DEEAC and three links of integration check.SEEAC supposes that two groups of this complementation innerly separately obtain CCT initial value t for the desirable people having the same aspiration and interest
C SE, revise corresponding error by SEEAC again and get t
C DE, the integration (or platform labor progression multistep is launched) under instructing with the PCOI mapping at last judges whether to have more serious plurality of pendulums unstability and eliminated mistake, obtains t
C IE(3) under classical model (CM), | t
C IE-t
C DE|/t
C DEWhen little, the critical excision angle δ that provides with DEEAC
C DEThe δ that provides with SEEAC
C SEPoor (or with corresponding η or t
c) reflect non-people having the same aspiration and interest degree when claiming (or the variation) σ in the group, and think that the complexity of its value and model has nothing to do, and less than certain threshold value, then directly uses formula δ as if σ
C DE(DM)=δ
C SE(DM) δ
C DE(CM)/δ
C DE(CM) conversion obtains the δ under the complex model (DM)
C DEAnd then can get t (DM),
C DE(DM).Integration without any need for the multimachine complex model does not need to do the integration check yet.(4) if greater than this thresholding, then the critical OMIB of the disturbed track of complex model multimachine under classical model with this reduced value correspondence does the PCOI mapping to ask for stability margin η
DE(DM), the DEEAC that launches with 4 step platform labor again asks for η by the sensitivity coefficient (single order and second order) that perturbation obtains under the classical model
DE(DM)=0 o'clock δ
C DEAnd then obtain t (DM),
C DE(DM).(5) work as t
C IE(CM) and t
C DEWhen (CM) falling far short, directly make mute time τ=t
e SE(DM), complex model being made integration sounds out to ask for t
C IE(DM).(6) only just need to check plurality of pendulums unstability under the complex model under following situation: corresponding classical model is down for the plurality of pendulums unstability or when having quick closing valve to control.(7) to SEEC (DM), the E of certain group's (as S group) equivalent machine
Qs' by the E of each machine
QsThrough Mi weighted mean E
QSAnd X
Qs=[∑ (X
Qi)
-1]
-1Calculate, make E ' by the model requirement again
Q3Remain unchanged or variation under equivalent automatic voltage regulator control.(8) to DEEAC (DM), E '
qGenerator model constant or that change all is treated to the E that upgrades piecemeal
QConstant model, nonlinear-load and dynamic load all are treated to the constant-impedance load that upgrades piecemeal.Therefore can ask δ i with big step-length platform labor series expansion by the equivalent classical model that upgrades piecemeal
I adopts structure-preserved admittance battle array, and with small step long process controller dynamically and induction motor dynamic.Upgrade the E of injection rate and each machine in each big step-length end of a period place
QiThe machine network interface is taken at the equivalent impedance X in the generator equivalent circuit
QiThe interior nodes place of back.Press integration step each machine δ value correction E at the end
QValue can be found the solution by linear equation.When (9) the equivalent angle that becomes the OMIB map when DEEAC is returned, ask for the permanent sine parameter of electronic rate, and establish mechanical output and no longer change, come the stability margin of calculation stability track by multimachine δ i.(10) model that IEEAC adopted in principle should be identical with the complexity of customer requirements.(11) for seeking the initial candidate group, earlier with variable step platform labor series expansion to 2
s, if the maximum angle in the whole period then continues to be deployed into 3 between (140 °, 300 °)
sIf still unstability is not then used τ=0.7
sAgain emulation once, in order to avoid τ=1
sFall into isolated stable region (ISD).(12) when integration check obtain the neutrality track after, (τ, δ) sequence is divided into homology group with the disturbed track of each machine by the extreme point coordinate at each merit angle.By each group correspondence the time become the time change trend of OMIB map in each time swung and judge the possibility whether ISD is arranged.If have, then more once with less τ value integration, to eliminate the influence of ISD.
The actual step of prevention and control is: (1) utilizes data acquisition system will be dispersed in electric power system real time information everywhere and is aggregated in the real-time data base of EMS, (2) utilize state estimation software that bad data is deleted, and extrapolate the work information that lacks, (3) calculating of TSA can periodically start automatically, also can start behind the electric power system generation Action Events or under the requirement the dispatcher, so that forecast failures all in the incident table is calculated one by one.
2, by the computer system of described in-service monitoring of claim 1 and prevention and control, it is characterized in that EEAC provides the stable region that limit power surrounded (TSD) by each generator (group) in the injecting power space, the latter can represent with bar intuitively, the actual power power and the TSD of each generator (group) are compared, if the generated output without any a machine (group) runs off TSD, then the dispatcher needn't carry out any adjustment, and electric power system can be born these forecast failures and non-unstability; Otherwise the dispatcher just should consider the power of each out-of-limit machine (group) is reduced to respectively in the limiting value, to guarantee transient security.
3, by the computer system of claim 1,2 described in-service monitorings and prevention and control.It is characterized in that its application scenario can be that on-line operation or operation planning also can be the planning applications of off-line; Its realization can closely be associated in together with EMS, also can be in the work station of special use.
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| CN95110947A CN1120556C (en) | 1995-02-25 | 1995-02-25 | In-line monitoring and prevention control system with stable transient for power system |
| PCT/CN1996/000012 WO1996027231A2 (en) | 1995-02-25 | 1996-02-09 | Qualitative analysis and policy decision method and control system for power system stability |
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| CN95110947A CN1120556C (en) | 1995-02-25 | 1995-02-25 | In-line monitoring and prevention control system with stable transient for power system |
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| CN1120556C CN1120556C (en) | 2003-09-03 |
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