CN101872975A - Self-adaptive dynamic equivalence method for transient rotor angle stability online analysis of power system - Google Patents
Self-adaptive dynamic equivalence method for transient rotor angle stability online analysis of power system Download PDFInfo
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- CN101872975A CN101872975A CN201010162089A CN201010162089A CN101872975A CN 101872975 A CN101872975 A CN 101872975A CN 201010162089 A CN201010162089 A CN 201010162089A CN 201010162089 A CN201010162089 A CN 201010162089A CN 101872975 A CN101872975 A CN 101872975A
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Abstract
The invention discloses a self-adaptive dynamic equivalence method for transient rotor angle stability online analysis of a power system. The invention belongs to the power system and automation technique fields. The method comprises the following steps of: calculating a detail degree index of dynamic equivalence carried out on the power system according to a transient rotor angle stability mode of the power grid after a certain expected failure under the power grid operation condition of the previous round, and the change of the current power grid operation condition relative to the power grid operation state of the previous round; carrying out the coherent equivalence on the generator of the rest generator group, the participation factor of which is less than the dynamic equivalence index, in the transient rotor angle stability mode of the failure; remaining nodes from which the electrical distances to other generators and the failure element are less than a set value and the branches directly connected with other branches; carrying out the corresponding network simplification on the power grid; and carrying out the transient rotor angle stability online analysis of the failure of the current round according to the equivalent power grid. Therefore, the calculation speed is improved by the invention.
Description
Technical field
The invention belongs to electric power system and technical field of automation.
Background technology
Power system safety and stability online analysis has now become a critical function of automation system for the power network dispatching, expansion gradually along with scale of power, the amount of calculation of online transient stability analysis is very big, become the principal element of restriction safety and stability online analysis speed, therefore, even the power system dynamic equivalence method still had great importance in today of computing power big raising to the utmost, particularly security and stability analysis and control decision in line computation.
Safety and stability online analysis is the safety and stability calculating of carrying out a plurality of forecast failures at electrical network actual motion state, and on the one hand, along with the fast development of generation of electricity by new energy and the progressively propelling of electricity market, power system operating mode is complicated and changeable; On the other hand, the electricity net safety stable characteristic under the different forecast failures is also different.Therefore, be difficult on the basis of calculated off-line, carry out the electrical network dynamic equivalent in advance, satisfy the required precision of safety on line stability Calculation.
The present invention proposes the electrical network dynamic equivalent method at single forecast failure, transient state angle stability pattern based on this fault, electrical network is divided into the research system and waits valve system, avoided all forecast failures are carried out the difficulty of research system and the division of equivalent systematic unity.Running status and characteristic according to the generator that participation factors is bigger in all generators of a critical group of planes in the transient state angle stability pattern of certain forecast failure and the remaining group of planes are this thinkings of key factor that influences electrical network transient state angle stability under this fault, in the comprehensive last round of transient state angle stability pattern in generator participation factors and the electrical network epicycle running status of key equipment with respect to last round of variation, calculate the level of detail index (hereinafter to be referred as " dynamic equivalent index ") of electrical network being carried out dynamic equivalent, the epicycle power system operating mode is carried out dynamic equivalent, be used for the transient state angle stability on-line analysis of this fault of epicycle, solve the self adaptation dynamic equivalent problem of electrical power system transient angle stability on-line analysis, realized under the prerequisite that satisfies big electrical network transient state angle stability on-line analysis required precision, increasing substantially the computational speed of on-line analysis.
Summary of the invention
The present invention seeks to: solve the self adaptation dynamic equivalent problem of electrical power system transient angle stability on-line analysis, under the prerequisite that satisfies big electrical network transient state angle stability on-line analysis required precision, increase substantially the computational speed of on-line analysis.
The present invention adopts following technical scheme to realize, comprises the steps:
1) if under the last round of operation of power networks state behind certain forecast failure the transient state angle stability nargin of electrical network greater than set point, or variation is not thrown/stopped to the current running status of generator with respect to last round of in the critical group of planes, or the current running status of the crucial section element of setting do not throw/stops variations with respect to last round of, then enters the 2nd) go on foot; Otherwise, stop calculating at the electrical network dynamic equivalent of this fault;
2) the transient state angle stability pattern of electrical network after this fault under the comprehensive last round of operation of power networks state, and the current running status of electrical network calculates the index of electrical network being carried out dynamic equivalent with respect to the intensity of variation of last round of operation of power networks state;
3) generator of participation factors absolute value in all generators of a critical group of planes in the transient state angle stability pattern of this fault and the remaining group of planes generator more than or equal to this dynamic equivalent index remained, do not carry out equivalence;
4) remaining less than the node of set point and the branch road that directly links to each other each other with this fault element electrical distance, do not carry out equivalence with the generator of above-mentioned reservation.
5) for remaining generator, promptly in the transient state angle stability pattern of this fault the participation factors absolute value of remaining group of planes generator less than the generator of this dynamic equivalent index, carry out the identification of a people having the same aspiration and interest group of planes, the polymerization of people having the same aspiration and interest generator bus and the polymerization of people having the same aspiration and interest generator model and parameter, again network is carried out abbreviation;
6) carry out the transient state angle stability on-line analysis of this fault of epicycle based on the electrical network behind the dynamic equivalent.
Additional disclosure be: if the transient state angle stability on-line analysis of this fault is for the first time, then electrical network is not carried out dynamic equivalent, directly carries out the transient state angle stability on-line analysis of this fault based on whole network data.
Effect and advantage:
The relative last round of variation of generator participation factors in the transient state angle stability pattern of comprehensive last round of certain forecast failure of the present invention with the epicycle running status of key equipment in the electrical network, calculate the dynamic equivalent index of electrical network, the epicycle power system operating mode is carried out dynamic equivalent, be used for the transient state angle stability on-line analysis of this fault of epicycle, solve the self adaptation dynamic equivalent problem of electrical power system transient angle stability on-line analysis, realized under the prerequisite that satisfies big electrical network transient state angle stability on-line analysis required precision, increasing substantially the computational speed of on-line analysis.
Description of drawings
Fig. 1 is the flow chart of the inventive method.
Embodiment
Below in conjunction with accompanying drawing 1, the inventive method is described in detail.
What step 1 was described among Fig. 1 is about whether carry out the criterion of dynamic equivalent in the transient state angle stability on-line analysis of this fault of epicycle, this criterion is if the transient state angle stability on-line analysis of this fault is for the first time, or under the last round of operation of power networks state after this fault the transient state angle stability nargin of electrical network greater than set point, or variation is not thrown/stopped to the current running status of generator with respect to last round of in the critical group of planes, or the current running status of the crucial section element of setting do not throw/stops variation with respect to last round of, then carries out the electrical network dynamic equivalent at this fault; Otherwise, electrical network is not carried out dynamic equivalent, directly carry out the transient state angle stability on-line analysis of this fault based on whole network data.
Step 2 is described among Fig. 1 be under the epicycle power system operating mode at the calculating of the dynamic equivalent index D of this fault, promptly adopt following formula (1) to calculate, wherein λ
iBe the participation factors of generator i in the transient state angle stability pattern after this fault under the last round of operation of power networks state, P
iAnd P
I0Be respectively the active power of epicycle and last round of generator i, n is the number of generator in the electrical network, the conversion factor of k for setting.
What step 3 was described among Fig. 1 is to need to keep which generator in epicycle electrical network dynamic equivalent, do not carry out equivalence, all generators that promptly keep a critical group of planes in the transient state angle stability pattern of this fault, and the participation factors absolute value in the remaining group of planes generator is more than or equal to the generator of D.
What step 4 was described among Fig. 1 is to need to keep which node and branch road in epicycle electrical network dynamic equivalent, do not carry out equivalence and abbreviation, promptly keep with the generator of above-mentioned reservation and this fault element electrical distance less than the node of set point and the branch road that directly links to each other each other.
What step 5 was described among Fig. 1 is for remaining generator, promptly in the transient state angle stability pattern of this fault the participation factors absolute value of remaining group of planes generator less than the generator of D, at first carry out the identification of a people having the same aspiration and interest group of planes, carry out the polymerization of people having the same aspiration and interest generator bus and the polymerization of people having the same aspiration and interest generator model and parameter again, at last network is carried out abbreviation.Wherein, can adopt method about the identification of a people having the same aspiration and interest group of planes based on curve similarity time response; In the polymerization of people having the same aspiration and interest generator bus, equivalent node voltage amplitude and phase place are set to the mean value of people having the same aspiration and interest generator bus voltage magnitude and phase place respectively, the power setting of equivalent generator is a people having the same aspiration and interest generator power sum, be set to people having the same aspiration and interest generator bus load sum Deng the load of value node, and the static characteristic load and the ratio of dynamic characteristic load and the composition of static characteristic load in the change of load not; About the polymerization of people having the same aspiration and interest generator model and parameter, can adopt frequency domain polymerization or weighted mean method; The network abbreviation can adopt electric current ditch short cut technique or the equivalent independent method of radiation.
What step 6 was described among Fig. 1 is this fault of transient state angle stability analysis carry out to(for) the electrical network behind the equivalence.
Claims (5)
1. the self adaptation dynamic equivalent method of electrical power system transient angle stability on-line analysis is characterized in that, may further comprise the steps:
1) if under the last round of operation of power networks state behind certain forecast failure the transient state angle stability nargin of electrical network greater than set point, or variation is not thrown/stopped to the current running status of generator with respect to last round of in the critical group of planes, or the current running status of the crucial section element of setting do not throw/stops variations with respect to last round of, then enters the 2nd) go on foot; Otherwise, stop calculating at the electrical network dynamic equivalent of this fault;
2) the transient state angle stability pattern of electrical network after this fault under the comprehensive last round of operation of power networks state, and the current running status of electrical network is with respect to the intensity of variation of last round of operation of power networks state, calculate the level of detail index of electrical network being carried out dynamic equivalent, i.e. the dynamic equivalent index;
3) generator of participation factors absolute value in all generators of a critical group of planes in the transient state angle stability pattern of this fault and the remaining group of planes generator more than or equal to this dynamic equivalent index remained, do not carry out equivalence;
4) remaining less than the node of set point and the branch road that directly links to each other each other with this fault element electrical distance, do not carry out equivalence with the generator of above-mentioned reservation;
5) for remaining generator, promptly in the transient state angle stability pattern of this fault the participation factors absolute value of remaining group of planes generator less than the generator of this dynamic equivalent index, carry out the identification of a people having the same aspiration and interest group of planes, the polymerization of people having the same aspiration and interest generator bus and the polymerization of people having the same aspiration and interest generator model and parameter, again network is carried out abbreviation;
6) carry out the transient state angle stability on-line analysis of this fault of epicycle based on the electrical network behind the dynamic equivalent.
2. require the self adaptation dynamic equivalent method of described electrical power system transient angle stability on-line analysis according to right 1, it is characterized in that, whether step 1) is about carrying out the criterion of dynamic equivalent in the transient state angle stability on-line analysis of this fault of epicycle, this criterion be if under the last round of operation of power networks state after this fault the transient state angle stability nargin of electrical network greater than set point, or variation is not thrown/stopped to the current running status of generator with respect to last round of in the critical group of planes, or the current running status of the crucial section element of setting do not throw/stops variation with respect to last round of, then carries out the electrical network dynamic equivalent at this fault.
3. requiring the self adaptation dynamic equivalent method of described electrical power system transient angle stability on-line analysis according to right 1, it is characterized in that step 2) dynamic equivalent index D adopts formula (1) to calculate, λ wherein
iBe the participation factors of generator i in the transient state angle stability pattern after this fault under the last round of operation of power networks state, P
iAnd P
I0Be respectively the active power of epicycle and last round of generator i, n is the number of generator in the electrical network, the conversion factor of k for setting.
4. require the self adaptation dynamic equivalent method of described electrical power system transient angle stability on-line analysis according to right 1, it is characterized in that, which generator is step 3) need to keep in epicycle electrical network dynamic equivalent, do not carry out equivalence, all generators that promptly keep a critical group of planes in the transient state angle stability pattern of this fault, and the participation factors absolute value in the remaining group of planes generator is more than or equal to the generator of D.
5. require the self adaptation dynamic equivalent method of described electrical power system transient angle stability on-line analysis according to right 1, it is characterized in that, step 4) needs to keep which node and branch road in epicycle electrical network dynamic equivalent, do not carry out equivalence and abbreviation, promptly keep with the generator of above-mentioned reservation and this fault element electrical distance less than the node of set point and the branch road that directly links to each other each other.
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| CN101969202A (en) * | 2010-11-23 | 2011-02-09 | 国网电力科学研究院 | Method for recognizing transmission section power limit interval of power system transient stability |
| CN102104252A (en) * | 2011-02-28 | 2011-06-22 | 浙江大学 | Power system dynamic equivalence method suitable for electromagnetic transient analysis |
| CN102270271A (en) * | 2011-05-03 | 2011-12-07 | 北京中瑞泰科技有限公司 | Equipment failure early warning and optimizing method and system based on similarity curve |
| CN102403716A (en) * | 2011-10-28 | 2012-04-04 | 上海电力学院 | Dynamic equalizing method for multi-infeed alternating/direct-current power grid |
| CN103647272A (en) * | 2013-10-22 | 2014-03-19 | 国家电网公司 | Alternating-current and direct-current power grid static equivalence method suitable for cascading failures |
| CN103928941A (en) * | 2014-03-28 | 2014-07-16 | 南方电网科学研究院有限责任公司 | Analytic solution method for aggregation of generators |
| CN105260495A (en) * | 2015-07-31 | 2016-01-20 | 国家电网公司 | Decoupling simulation analysis method for identifying power angle instability reason of large-disturbance power grid |
| CN105938174A (en) * | 2016-05-13 | 2016-09-14 | 云南电力调度控制中心 | Rapid identification method for power transmission line fault location of most severe transient power angle stability |
| US9960600B1 (en) | 2016-10-31 | 2018-05-01 | General Electric Company | Detection and mitigation of instability of synchronous machines |
| CN109698497A (en) * | 2017-10-23 | 2019-04-30 | 南方电网科学研究院有限责任公司 | A kind for the treatment of method and apparatus of power system dynamic equivalence median generatrix load |
| CN111371089A (en) * | 2020-03-10 | 2020-07-03 | 南瑞集团有限公司 | Power grid dynamic equivalence quantitative evaluation method and system |
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| CN101969202A (en) * | 2010-11-23 | 2011-02-09 | 国网电力科学研究院 | Method for recognizing transmission section power limit interval of power system transient stability |
| CN102104252A (en) * | 2011-02-28 | 2011-06-22 | 浙江大学 | Power system dynamic equivalence method suitable for electromagnetic transient analysis |
| CN102104252B (en) * | 2011-02-28 | 2012-11-07 | 浙江大学 | Power system dynamic equivalence method suitable for electromagnetic transient analysis |
| CN102270271A (en) * | 2011-05-03 | 2011-12-07 | 北京中瑞泰科技有限公司 | Equipment failure early warning and optimizing method and system based on similarity curve |
| CN102270271B (en) * | 2011-05-03 | 2014-03-19 | 北京中瑞泰科技有限公司 | Equipment failure early warning and optimizing method and system based on similarity curve |
| CN102403716A (en) * | 2011-10-28 | 2012-04-04 | 上海电力学院 | Dynamic equalizing method for multi-infeed alternating/direct-current power grid |
| CN103647272A (en) * | 2013-10-22 | 2014-03-19 | 国家电网公司 | Alternating-current and direct-current power grid static equivalence method suitable for cascading failures |
| CN103928941A (en) * | 2014-03-28 | 2014-07-16 | 南方电网科学研究院有限责任公司 | Analytic solution method for aggregation of generators |
| CN105260495A (en) * | 2015-07-31 | 2016-01-20 | 国家电网公司 | Decoupling simulation analysis method for identifying power angle instability reason of large-disturbance power grid |
| CN105260495B (en) * | 2015-07-31 | 2018-11-30 | 国家电网公司 | A kind of decoupling simulation analysis method of the big interference power grid generator rotor angle cause of destabilization of identification |
| CN105938174A (en) * | 2016-05-13 | 2016-09-14 | 云南电力调度控制中心 | Rapid identification method for power transmission line fault location of most severe transient power angle stability |
| CN105938174B (en) * | 2016-05-13 | 2018-11-30 | 云南电力调度控制中心 | The transmission line malfunction position method for quickly identifying of transient rotor angle stability most serious |
| US9960600B1 (en) | 2016-10-31 | 2018-05-01 | General Electric Company | Detection and mitigation of instability of synchronous machines |
| CN109698497A (en) * | 2017-10-23 | 2019-04-30 | 南方电网科学研究院有限责任公司 | A kind for the treatment of method and apparatus of power system dynamic equivalence median generatrix load |
| CN111371089A (en) * | 2020-03-10 | 2020-07-03 | 南瑞集团有限公司 | Power grid dynamic equivalence quantitative evaluation method and system |
| CN111371089B (en) * | 2020-03-10 | 2022-07-05 | 南瑞集团有限公司 | Power grid dynamic equivalence quantitative evaluation method and system |
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