CN101404411A - Fault fitting method in load modeling - Google Patents
Fault fitting method in load modeling Download PDFInfo
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- CN101404411A CN101404411A CNA2008102251761A CN200810225176A CN101404411A CN 101404411 A CN101404411 A CN 101404411A CN A2008102251761 A CNA2008102251761 A CN A2008102251761A CN 200810225176 A CN200810225176 A CN 200810225176A CN 101404411 A CN101404411 A CN 101404411A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention discloses a digital simulation of an electric power system which is deep in the fields like planning, designing, running and researching of the electric power system. The simulation result of the digital simulation becomes the main foundation for the decisions in the fields. A load is used as the important composition part of the electric power system; the model and the parameters of the load have important effects on the digital simulation result of the electric power system. Building an accurate load model is a universal difficulty due to the composition complexity of the load. The digital simulation carries out simulation analysis on a plurality of running modes and a plurality of failure modes of a northwest power network and carries out comparison analysis on the wave recording result of a plurality of failures based on a synthesized load model (SLM) which more reasonably considers the line of a distribution network in structure.
Description
Technical field
The present invention relates to a kind of simulation and calculating of electric power system, particularly the modeling method of power system load model.
Background technology
Load modeling has three kinds of approach: statistics synthesis, total body examination are distinguished method and based on the load modeling method of accident emulation.Fault fitting is a kind of load model modeling method based on the power system accident simulation.Here " accident " both referred to accidental power system accident, referred to that also the people is the upset tests such as short circuit that carry out; Load " modeling " based on co simulate, usually not the load modeling of " growing out of nothing ", and by co simulate the load model of original employing is carried out verification often, if necessary, then need load model parameters to be adjusted according to the co simulate result.
Situation common in engineering reality is: when certain unified power system begins to carry out analog computation in early days, at first rule of thumb select a certain common load model (selected one group of canonical parameter), whether can reflect as for this model then needs the actual conditions of this system to test by co simulate.Can reflect the load model of actual conditions in a certain stage of power network development, after power network development changes, may no longer have adaptability.Therefore, load model should constantly carry out verification and adjustment by co simulate.Based on co simulate load model being carried out verification and adjustment, is very effective and direct load modeling method in the engineering reality.
The characteristic that load model shows may hinder the difference of form, the position of fault, operational mode and difference for some reason, and this is based on the difficult point place that co simulate is checked load model.With regard to China present electric network composition and operation level, the possibility that big disturbance fault takes place is very little, and the check research of load model is research object with the microvariations accident often, but the load model that obtains thus, the characteristic when may can not the reflection system being subjected to big disturbance.And in Electric Power Network Planning and in service, the ability decision of catastrophe failure is born in the selection of the selection of programme, section power controlling in service just according to system.
Summary of the invention
As described in the flow chart of Fig. 4, method of the present invention may further comprise the steps:
Operational mode when 1) setting up accident
According to the operational mode of data (start mode, transformer station's load) when setting up test of automated system record, also promptly set up the trend stability Calculation data that can be used for co simulate.Calculation of tidal current should with actual measurement trend basically identical, gross capability, total load, main line transmission power, main busbar voltage all want consistent.The ruuning situation of generator excited system, governing system, power system stabilizer, PSS and other control appliance during the investigation accident is set up the stability Calculation data.
2) determine the co simulate mode
According to the failure wave-recording curve, determine fault clearing time and short-circuit impedance, if cutter has taken place, fall disturbances such as load in process of the test, determine in emulation, how these disturbances to be simulated according to measured data.
3) co simulate, model parameter are checked and are adjusted
Main contents comprise: 1) at first carry out analog computation based on the computation model parameter of present employing; 2) inconsistent fashionable when result of calculation and actual measurement, at first should check and approve the model and the parameter of other element except that load model, comprise generator model parameter, excitation system model parameter, generator governing system etc.; 3) if simulation result and actual measurement are still inconsistent, consider again load model parameters to be adjusted by sensitivity analysis, content comprises load model structure, ratio, if dynamic part adopts induction motor model, then also tackles motor parameter and carries out sensitivity analysis.On the aforementioned calculation analysis foundation, preliminary model parameter adjustment suggestion is proposed.
4) Analysis on Mechanism
Though adjusted load model parameters can compare simulation accurately to accident,, whether this model can be applied in the analog computation of following electrical network, and how are its range of application or application conditions, still need and will carry out Analysis on Mechanism.
5) simulate and survey conforming judgement
Co simulate and measured result can not reach " identical ", but should keep " basically identical ".The principle of so-called basically identical comprises:
(1) frequency of oscillation basically identical;
(2) needed time basically identical is calmed down in system oscillation;
(3) first amplitude of oscillation degree, follow-up oscillation damping characteristic are answered basically identical after swing curve the profile unanimity, particularly failure removal of each line power of major network (phase difference of voltage);
(4) back steady-state value basically identical is calmed down in merit angle, power, system voltage vibration;
(5) the system voltage rise time, toning, stable state recovery voltage, voltage curve profile whether occur and answer basically identical;
(6) transient voltage falls basically identical.
Advantage of the present invention is:
The model parameter that obtains by co simulate is not unique.And send two operational modes at Northwest Grid transferring electricity from the west to the east, Dong Dianxi in 2007 in this research, jump eyebrow harmony line, cut two machines of safe and comfortable power plant, cut a plurality of perturbation schemes such as machine in Li Jia gorge and carried out co simulate with regard to fault-free, and based on the structure more the integrated load model of reasonable contemplation distribution network (SLM) comparatively responsive parameter such as motor ratio, motor inertia time constant, rotor resistance is revised.Meritorious, reactive power simulation result to many 330kV circuits such as Tao Xi, day harmony, Qin Yong compares with actual record ripple result at last, verified that the new parameter based on the integrated load model structure of considering distribution network that proposes is a rational and effective.
Description of drawings
Fig. 1 is transferring electricity from the west to the east 950MW, and power system stabilizer, PSS is thrown, and fault-free is jumped eyebrow harmony line, the stability Calculation result curve of day harmony line active power (Yong Cheng side);
Fig. 2 is transferring electricity from the west to the east 950MW, and power system stabilizer, PSS is thrown, and fault-free is jumped eyebrow harmony line, the stability Calculation result curve of day harmony line reactive power (Yong Cheng side);
Fig. 3 is that Dong Dianxi send 800MW, and power system stabilizer, PSS is thrown, and fault-free is jumped eyebrow harmony line, the stability Calculation result curve of peach west line active power (Xifeng side);
Fig. 4 is the flow chart of steps according to the fault fitting method in the load modeling of the present invention.
Embodiment
Be described in detail the application that the fault fitting method is modeled in Northwest Grid below in conjunction with accompanying drawing 1-3.
The operational mode of system when 1, setting up fault
In practical application, adopt transferring electricity from the west to the east 950MW, Dong Dianxi to send 800MW two operational modes to Northwest Grid;
2, determine fault mode
1) transferring electricity from the west to the east 950MW, power system stabilizer, PSS is thrown, and fault-free is jumped eyebrow harmony line;
2) Dong Dianxi send 800MW, and power system stabilizer, PSS is thrown, and fault-free is jumped eyebrow harmony line;
3) Dong Dianxi send 800MW, and power system stabilizer, PSS is thrown, and cuts two of safe and comfortable Power Plant;
4) transferring electricity from the west to the east 950MW, power system stabilizer, PSS is thrown, and cuts the unit in Li Jia gorge;
3, carry out simulation calculation
Adopt the existing load model of Northwest Grid, static 3-4-3ZIP model, static 4-6ZP model, 50%II type motor+50% constant-impedance model and consider that the integrated load model (SLM) of distribution network carries out fault simulation, and compare with actual measurement record ripple curve.The result shows that the integrated load model of employing consideration distribution network adopts the fitting effect of other model good.But still there is certain difference with measured result.
4, carrying out on the structure more rational SLM model revises
The motor ratio increases by 60% and is increased to 65%;
The motor inertia time constant was increased to 3.5 seconds by 3 seconds;
Rotor resistance is increased to 0.18pu by original 0.009pu;
5, adopt revised SLM model to carry out simulation calculation
Adopt simulation result and the measured curve of revised SLM to have consistency preferably, can satisfy emulation and the conforming criterion of actual measurement.
Invention has been described according to specific exemplary embodiment herein.It will be conspicuous carrying out suitable replacement to one skilled in the art or revise under not departing from the scope of the present invention.Exemplary embodiment only is illustrative, rather than to the restriction of scope of the present invention, scope of the present invention is by appended claim definition.
Claims (1)
1, the fault fitting method in a kind of load modeling is characterized in that this method may further comprise the steps:
Operational mode when one) setting up accident
Operational mode when setting up test according to the data of automated system record, as the trend stability Calculation data that are used for co simulate, calculation of tidal current should with actual measurement trend basically identical as a result, the ruuning situation of generator excited system, governing system, power system stabilizer, PSS and other control appliance during the investigation accident is set up stable calculated data;
Two) determine the co simulate mode
According to the failure wave-recording curve, determine fault clearing time and short-circuit impedance, in process of the test if the disturbance that cutter has taken place, fallen to load then determines how these disturbances are simulated according to measured data in emulation;
Three) co simulate, model parameter are checked and are adjusted
(1) at first carries out analog computation based on the computation model parameter of present employing;
(2) when result of calculation and measured result are inconsistent, adjust the model and the parameter of other element except that load model earlier;
(3) if simulation result and actual measurement are still inconsistent, by sensitivity analysis load model parameters is adjusted again, comprise load model structure and ratio, if dynamic part adopts induction motor model, also to carry out sensitivity analysis to motor parameter, on the aforementioned calculation analysis foundation, formulate preliminary model parameter and adjust scheme;
Four) carry out Analysis on Mechanism
Five) simulate and survey conforming judgement
The principle of described co simulate and measured result basically identical comprises:
(1) frequency of oscillation basically identical;
(2) needed time basically identical is calmed down in system oscillation;
(3) the swing curve profile unanimity of each line power of major network, first amplitude of oscillation degree, follow-up oscillation damping characteristic basically identical behind the failure removal;
(4) the steady-state value basically identical after merit angle, power, system voltage vibration are calmed down;
(5) the system voltage rise time, whether toning, stable state recovery voltage, voltage curve profile basically identical appear;
(6) transient voltage falls the scope basically identical.
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| CNA2008102251761A CN101404411A (en) | 2008-10-30 | 2008-10-30 | Fault fitting method in load modeling |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101789598A (en) * | 2010-03-05 | 2010-07-28 | 湖北省电力试验研究院 | Power system load modelling method |
| CN102043698A (en) * | 2010-09-15 | 2011-05-04 | 苏州凌创电子系统有限公司 | Network-based functional test load simulation device |
| CN102117368A (en) * | 2011-03-15 | 2011-07-06 | 广东省电力调度中心 | Power grid model customized method and system |
| CN102298671A (en) * | 2011-06-29 | 2011-12-28 | 河北省电力研究院 | Simulation method for realizing replay of grid fault |
| CN103018633A (en) * | 2012-12-12 | 2013-04-03 | 中国石油大学(华东) | Distribution grid (DG) contained fault interval judgment method based on impedance model short circuit fault characteristics |
| CN104319794A (en) * | 2014-11-07 | 2015-01-28 | 国家电网公司 | Alternating current and direct current coordination control method improving system stability |
| CN103500238B (en) * | 2012-05-31 | 2015-08-05 | 山东电力集团公司青岛供电公司 | A kind of electric power system operation analogy method |
| CN105514983A (en) * | 2015-12-07 | 2016-04-20 | 中国电力科学研究院 | Load model construction method based on statistical synthesis method and fault simulation method |
| CN106033497A (en) * | 2015-03-20 | 2016-10-19 | 国家电网公司 | Power grid planning and design phase load model selecting method |
| CN106356846A (en) * | 2016-10-18 | 2017-01-25 | 国网山东省电力公司烟台供电公司 | Time-based initial-stage power grid cascading failure analog simulation method |
| CN106556765A (en) * | 2017-01-04 | 2017-04-05 | 国网浙江省电力公司电力科学研究院 | The method of testing and RTDS emulators of distributed distribution automation system |
| CN110675279A (en) * | 2019-09-20 | 2020-01-10 | 国网山东省电力公司检修公司 | Power grid building simulation system based on AI visualization |
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- 2008-10-30 CN CNA2008102251761A patent/CN101404411A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789598A (en) * | 2010-03-05 | 2010-07-28 | 湖北省电力试验研究院 | Power system load modelling method |
| CN102043698A (en) * | 2010-09-15 | 2011-05-04 | 苏州凌创电子系统有限公司 | Network-based functional test load simulation device |
| CN102117368A (en) * | 2011-03-15 | 2011-07-06 | 广东省电力调度中心 | Power grid model customized method and system |
| CN102298671A (en) * | 2011-06-29 | 2011-12-28 | 河北省电力研究院 | Simulation method for realizing replay of grid fault |
| WO2013000241A1 (en) * | 2011-06-29 | 2013-01-03 | 河北省电力研究院 | Simulation method for recurrence of power grid fault |
| CN103500238B (en) * | 2012-05-31 | 2015-08-05 | 山东电力集团公司青岛供电公司 | A kind of electric power system operation analogy method |
| CN103018633B (en) * | 2012-12-12 | 2015-11-25 | 中国石油大学(华东) | Based on dissymmetrical impedance model short-circuit current fault signature containing the interval decision method of DG distribution network failure |
| CN103018633A (en) * | 2012-12-12 | 2013-04-03 | 中国石油大学(华东) | Distribution grid (DG) contained fault interval judgment method based on impedance model short circuit fault characteristics |
| CN104319794A (en) * | 2014-11-07 | 2015-01-28 | 国家电网公司 | Alternating current and direct current coordination control method improving system stability |
| CN106033497A (en) * | 2015-03-20 | 2016-10-19 | 国家电网公司 | Power grid planning and design phase load model selecting method |
| CN106033497B (en) * | 2015-03-20 | 2020-06-30 | 国家电网公司 | Method for selecting load model in power grid planning and designing stage |
| CN105514983A (en) * | 2015-12-07 | 2016-04-20 | 中国电力科学研究院 | Load model construction method based on statistical synthesis method and fault simulation method |
| CN105514983B (en) * | 2015-12-07 | 2020-05-12 | 中国电力科学研究院 | Load model construction method based on statistical synthesis method and fault fitting method |
| CN106356846A (en) * | 2016-10-18 | 2017-01-25 | 国网山东省电力公司烟台供电公司 | Time-based initial-stage power grid cascading failure analog simulation method |
| CN106556765A (en) * | 2017-01-04 | 2017-04-05 | 国网浙江省电力公司电力科学研究院 | The method of testing and RTDS emulators of distributed distribution automation system |
| CN106556765B (en) * | 2017-01-04 | 2019-03-19 | 国网浙江省电力公司电力科学研究院 | The test method and RTDS emulator of distributed distribution automation system |
| CN110675279A (en) * | 2019-09-20 | 2020-01-10 | 国网山东省电力公司检修公司 | Power grid building simulation system based on AI visualization |
| CN110675279B (en) * | 2019-09-20 | 2023-08-01 | 国网山东省电力公司检修公司 | Power grid construction simulation system based on AI visualization |
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Application publication date: 20090408 |