CN101242102A - Method for integrated evaluation of large-scale complex power grid - Google Patents
Method for integrated evaluation of large-scale complex power grid Download PDFInfo
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- CN101242102A CN101242102A CNA200810020221XA CN200810020221A CN101242102A CN 101242102 A CN101242102 A CN 101242102A CN A200810020221X A CNA200810020221X A CN A200810020221XA CN 200810020221 A CN200810020221 A CN 200810020221A CN 101242102 A CN101242102 A CN 101242102A
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Abstract
The invention provides a method for integrally estimating the large scale complicated power grid. This method sets up electromagnetic transient, electro mechanics transient theory analyzing models aiming at the complicated power system of different characteristics of the alternative power transmission, direct current power transmission and, nuclear power unit. This method adopts the self-defining modeling method to carry on the power grid assessment of current situation, and integral assessment transient stability, voltage stability, damping feature of the large scale power grid comprising series compensation, direct current, nuclear power. This method points out the weak link of the power grid and puts forward the corresponding solution plans. This method breaks out limits that use single method to analyze the single problem for the power grid; this method also deepens the content of the power grid analysis and provides technical support for entirely grasping operation situation of the power grid.
Description
Technical field
The present invention adopts the electric component Mathematical Modeling of setting up different qualities, the power system stability problem of different mechanism is carried out the method for analysis-by-synthesis, carry out the emulation of electro-magnetic transient and electromechanical transient, point out the weak link of electrical network, propose aspects such as the configuration suggestion of guiding plan operation, electrical network three road security perimeters.Belong to electric power system computational analysis technical field.
Background technology
8.14 accidents of having a power failure on a large scale have taken place in the U.S. in 2003 and Canadian some areas.This accident causes the tremendous economic loss not only for the U.S. and Canada, and global electric power industry development is had a far reaching influence.The large area blackout on ground such as London, Italy, Denmark, Sweden also took place in 2003.These and the historical accident of having a power failure on a large scale have been beaten alarm bell to the safe and stable operation of China's electrical network.
In recent years along with the sustained and rapid development of regional economy, load growth is swift and violent, the power supply capacity of electrical network has been proposed growth requirement out of routine, electrical network reserve capacity deficiency, operate under the less margin of safety, need take to avoid the peak hour, keep away the peak, ration the power supply and strengthen the safe and stable operation that effective measures such as outsourcing electric weight ensure electrical network, in addition along with the electrical network installed capacity, the scale of power fast development, also great changes will take place for the electrical network dynamic characteristic, stable problem is also more intricate and have a disguise, direct current transportation, losing also of large power supplies such as nuclear power generating sets will constitute greatly threat to the safe and stable operation of electrical network, may lead to grave consequences.
The present invention is according to actual electric network structure and characteristics, the method that proposes to adopt large-scale complex power grid to carry out comprehensive assessment is carried out network analysis to the electric network composition that complexity constitutes, through The actual running results, show that analysis result all has obvious optimization function to physical planning design, operational mode arrangement and being provided with of three lines of defence.
Summary of the invention
The objective of the invention is the complex electric network of the big installed capacity that comprises electric equipments such as direct current, nuclear power, pumped storage is carried out analysis-by-synthesis, carry out electro-magnetic transient and electromechanical transient simulation, analyze the stable problem of different mechanism, comprise that static security, transient stability, voltage are stable, low-frequency oscillation etc., analyze influencing each other and the safety and stability nargin of electrical network of different elements, propose rational approach and solve the electrical network weak link that exists, reach the purpose of safe early warning and guarantee power network safety operation.
The present invention takes following technical scheme to realize:
Large-scale complex power grid carries out the method for comprehensive assessment, and its step is as follows:
(1) in software, sets up the large scale electric network simulation model, mainly comprise electric components such as generator, alternating current circuit, transformer, load;
(2) according to studying a question emphasis, set up the element Mathematical Modeling of the level of detail that meets analyze demands, adopt the method for self-defined modeling that string benefit, direct current transportation, nuclear power generating sets are set up electro-magnetic transient, electromechanical transient model respectively;
(3) the whole network is carried out comprehensive evaluation, calculate stable, the damping characteristic of trend, short circuit, transient stability, voltage of the whole network, analyze the interaction and the influence of direct current system and AC system, and the medium-term and long-term stable case of system of taking into account the nuclear power generating sets dynamic characteristic.
Aforesaid large-scale complex power grid carries out the method for comprehensive assessment, and each that it is characterized in that setting up direct current transportation, nuclear power generating sets formed the Mathematical Modeling of components and parts, and specific question has been carried out going deep into specific analysis, carries out the emulation of electro-magnetic transient and electromechanical transient.
Aforesaid large-scale complex power grid carries out the method for comprehensive assessment, it is characterized in that analysis-by-synthesis has calculated that trend, short circuit current, transient stability, voltage are stable, all many-sides such as damping characteristic, electro-magnetic transient and associated load model, direct current transportation, gulf, field nuclear power, find the organic connections of the various stable problems of electrical network.
The invention has the beneficial effects as follows: according to actual electric network structure and characteristics, the method that proposes to adopt large-scale complex power grid to carry out comprehensive assessment is carried out network analysis to the electric network composition that complexity constitutes, through The actual running results, show that analysis result all has obvious optimization function to physical planning design, operational mode arrangement and being provided with of three lines of defence.At ac transmission, direct current transportation, the complicated electric power system of nuclear power generating sets different qualities is set up electro-magnetic transient, the electromechanical transient theoretical analysis model, adopt the method for self-defined modeling to carry out the assessment of present situation electrical network, mend comprising string, direct current, the transient stability of the complicated large scale electric network of nuclear power, voltage stability, damping characteristics etc. are carried out overall merit, point out the weak link of electrical network and propose corresponding solution, this method has broken through tradition and has only taked single method electrical network to be carried out the limitation of single case study, deepened the content of electrical network analysis, provide technical support for grasp the operation of power networks situation comprehensively.
Embodiment:
Large-scale complex power grid of the present invention carries out the method for comprehensive assessment, and its concrete principle is specifically described as follows:
(1) first of technical scheme: according to the scale and the structure of research electrical network, foundation has the model of elements such as generator, transformer, transmission line, load, capacity reactance, make up the basic calculation data platform of large scale electric network, default different mode is arranged, failure mode and position of fault scheme.
(2) second portion of technical scheme: mend to having string, direct current transportation, the electrical network of nuclear power generating sets, purpose according to research, analyze the math equation or the variable transfer function of each module, operating characteristics and research emphasis according to different elements, the self-defined Mathematical Modeling of setting up, the simulation step length of electro-magnetic transient is 50 microseconds, the simulation step length of electromechanical transient is 100 milliseconds, the detail mathematic model that string is mended comprises electric capacity, MOV, the gap, control strategy, the detail mathematic model of direct current transportation comprises converting plant, DC power transmission line, Inverter Station, control system, the detail mathematic model of nuclear power generating sets comprises reactor, steam generator, power regulating system, steam turbine primary system model and generator, the exciter electrical secondary system.
(3) third part of technical scheme: on basis, electrical network is carried out comprehensive assessment calculate, comprise trend, short circuit, transient stability, stable, the damping characteristic of voltage, the line sensitivity of going forward side by side analytical calculation with accurate electrical network calculated data.
By start-stop, the load proportion of unit, control conveying trend, the calculating transient stability limit of crucial section, for the operational mode arrangement provides foundation.
The load model that setting is made of motor, impedance, permanent power different proportion calculates the stable sensitivity analysis, finds out stable critical point.By little interference calculation, analyze the damped oscillation pattern of the whole network, comprise characteristic value, characteristic vector, damping ratio, calculate conclusion and can be used for disposing power system stabilizer, PSS and parameter setting.
Simulation calculation research string by electro-magnetic transient is mended, the operating characteristics during DC transmission system generation unbalanced fault and and system between influence each other, analyze of the influence of AC network fault to current conversion station busbar voltage and commutation failure, and the relation of the direct current system commutation failure and the fault order of severity.
Because the operating characteristics of each module of nuclear power generating sets is slower, the simulation step length of electromechanical transient meets the demands, and can carry out the stability Calculation of the midium or long term of simulation step length variation, analyzes the dynamic characteristic of nuclear power generating sets.
Above-mentioned example limits the present invention never in any form, and all employings are equal to the technical scheme that form obtained of replacement or equivalent transformation, all drop within protection scope of the present invention.
Claims (3)
1, large-scale complex power grid carries out the method for comprehensive assessment, and its step is as follows:
(1) sets up the large scale electric network simulation model, mainly comprise electric components such as generator, alternating current circuit, transformer, load;
(2) according to studying a question emphasis, set up the element Mathematical Modeling of the level of detail that meets analyze demands, adopt the method for self-defined modeling that string benefit, direct current transportation, nuclear power generating sets are set up electro-magnetic transient, electromechanical transient model respectively;
(3) the whole network is carried out comprehensive evaluation, calculate stable, the damping characteristic of trend, short circuit, transient stability, voltage of the whole network, analyze the interaction and the influence of direct current system and AC system, and the medium-term and long-term stable case of system of taking into account the nuclear power generating sets dynamic characteristic.
2, large-scale complex power grid according to claim 1 carries out the method for comprehensive assessment, each that it is characterized in that setting up direct current transportation, nuclear power generating sets formed the Mathematical Modeling of components and parts, and specific question carried out going deep into specific analysis, carry out the emulation of electro-magnetic transient and electromechanical transient.
3, large-scale complex power grid according to claim 1 carries out the method for comprehensive assessment, it is characterized in that analysis-by-synthesis has calculated that trend, short circuit current, transient stability, voltage are stable, all many-sides such as damping characteristic, electro-magnetic transient and associated load model, direct current transportation, gulf, field nuclear power, find the organic connections of the various stable problems of electrical network.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895124A (en) * | 2010-05-27 | 2010-11-24 | 中国电力科学研究院 | Coupling assessment method for judging mutual influence of alternating current-direct current parallel/series-parallel systems |
| CN102118026A (en) * | 2011-03-21 | 2011-07-06 | 江苏省电力试验研究院有限公司 | ETAP-based harmonic and negative sequence power flow method for large-scale power grid |
| CN102315643A (en) * | 2011-08-19 | 2012-01-11 | 河南电力试验研究院 | Three defensive lines based automatic batch fault set generation method |
| CN102708260A (en) * | 2012-05-29 | 2012-10-03 | 清华大学 | Electromagnetic transient state simulation method and device |
| CN102760181A (en) * | 2012-05-29 | 2012-10-31 | 清华大学 | Method and device for calculating degree of accuracy of electromagnetic transient simulation result |
| CN103117565A (en) * | 2013-01-28 | 2013-05-22 | 南方电网科学研究院有限责任公司 | Analysis method for researching alternating-current/direct-current interactive influence mechanism |
| CN103138259A (en) * | 2013-01-09 | 2013-06-05 | 中国电力科学研究院 | Safety and stability analysis method for access of intermittent large-scale wind power to grid |
| CN103728517A (en) * | 2014-01-10 | 2014-04-16 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Correcting algorithm for transformer state assessment by considering poor working conditions |
| CN103971298A (en) * | 2014-05-26 | 2014-08-06 | 国家电网公司 | Simulation analysis method for nuclear power and power grid mutual interference |
| CN104778343A (en) * | 2014-12-05 | 2015-07-15 | 南方电网科学研究院有限责任公司 | Method for rapidly creating medium-term and long-term stable calculation models for power system |
| CN107219772A (en) * | 2017-05-23 | 2017-09-29 | 南方电网科学研究院有限责任公司 | Test method, the apparatus and system of many line downs suppression and isolating device functional parameter |
| CN110879537A (en) * | 2018-09-06 | 2020-03-13 | 珠海格力电器股份有限公司 | Method and device for processing transient stability of intelligent household energy system |
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2008
- 2008-02-28 CN CNA200810020221XA patent/CN101242102A/en active Pending
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895124B (en) * | 2010-05-27 | 2012-11-07 | 中国电力科学研究院 | Coupling assessment method for judging mutual influence of alternating current-direct current parallel/series-parallel systems |
| CN101895124A (en) * | 2010-05-27 | 2010-11-24 | 中国电力科学研究院 | Coupling assessment method for judging mutual influence of alternating current-direct current parallel/series-parallel systems |
| CN102118026A (en) * | 2011-03-21 | 2011-07-06 | 江苏省电力试验研究院有限公司 | ETAP-based harmonic and negative sequence power flow method for large-scale power grid |
| CN102315643A (en) * | 2011-08-19 | 2012-01-11 | 河南电力试验研究院 | Three defensive lines based automatic batch fault set generation method |
| CN102315643B (en) * | 2011-08-19 | 2014-09-10 | 河南电力试验研究院 | Three defensive lines based automatic batch fault set generation method |
| CN102708260B (en) * | 2012-05-29 | 2014-11-26 | 清华大学 | Electromagnetic transient state simulation method and device |
| CN102708260A (en) * | 2012-05-29 | 2012-10-03 | 清华大学 | Electromagnetic transient state simulation method and device |
| CN102760181A (en) * | 2012-05-29 | 2012-10-31 | 清华大学 | Method and device for calculating degree of accuracy of electromagnetic transient simulation result |
| CN102760181B (en) * | 2012-05-29 | 2014-07-02 | 清华大学 | Method and device for calculating degree of accuracy of electromagnetic transient simulation result |
| CN103138259A (en) * | 2013-01-09 | 2013-06-05 | 中国电力科学研究院 | Safety and stability analysis method for access of intermittent large-scale wind power to grid |
| CN103138259B (en) * | 2013-01-09 | 2015-06-10 | 中国电力科学研究院 | Safety and stability analysis method for access of intermittent large-scale wind power to grid |
| CN103117565A (en) * | 2013-01-28 | 2013-05-22 | 南方电网科学研究院有限责任公司 | Analysis method for researching alternating-current/direct-current interactive influence mechanism |
| CN103117565B (en) * | 2013-01-28 | 2016-03-09 | 南方电网科学研究院有限责任公司 | A kind of analytical method studying alternating-current/interactiveent interactiveent influence mechanism |
| CN103728517A (en) * | 2014-01-10 | 2014-04-16 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Correcting algorithm for transformer state assessment by considering poor working conditions |
| CN103728517B (en) * | 2014-01-10 | 2017-02-01 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Correcting algorithm for transformer state assessment by considering poor working conditions |
| CN103971298A (en) * | 2014-05-26 | 2014-08-06 | 国家电网公司 | Simulation analysis method for nuclear power and power grid mutual interference |
| CN104778343A (en) * | 2014-12-05 | 2015-07-15 | 南方电网科学研究院有限责任公司 | Method for rapidly creating medium-term and long-term stable calculation models for power system |
| CN107219772A (en) * | 2017-05-23 | 2017-09-29 | 南方电网科学研究院有限责任公司 | Test method, the apparatus and system of many line downs suppression and isolating device functional parameter |
| CN110879537A (en) * | 2018-09-06 | 2020-03-13 | 珠海格力电器股份有限公司 | Method and device for processing transient stability of intelligent household energy system |
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