CN101741099B - Method for preventing false tripping of electric system out-of-step separating device in symmetrical fault - Google Patents
Method for preventing false tripping of electric system out-of-step separating device in symmetrical fault Download PDFInfo
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- CN101741099B CN101741099B CN 201010018393 CN201010018393A CN101741099B CN 101741099 B CN101741099 B CN 101741099B CN 201010018393 CN201010018393 CN 201010018393 CN 201010018393 A CN201010018393 A CN 201010018393A CN 101741099 B CN101741099 B CN 101741099B
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Abstract
The invention discloses method for preventing false tripping of electric system out-of-step separating device in symmetrical fault, including the step of realizing shutting of the out-of-step separating device and the step of opening out-of-step separation function. The shutting and opening of the out-of-step separating device is judged by measuring electrical quantity in real time. The invention can not be in failure to operate in out-of-step oscillation caused by simple destroying on steady state. The invention can reliably avoid false tripping of out-of-step separating device in electric system symmetrical fault, out-of-step separating function is rapidly judged after fault is removed, and failure to operate can not appear when coherent generator groups in the electric system after fault is removed are in asynchronous running.
Description
Technical field
The invention belongs to the Power System and its Automation technical field, relate to a kind of method that prevents the malfunction in symmetrical fault of electric power system step-out disconnection device more precisely.
Background technology
Electric power system may asynchronous operation between a people having the same aspiration and interest group of planes when meeting with disturbance, if can not in time adopt an effective measure, accident might develop toward the direction of extension, even the ill effect of large-area power-cuts occurs.When asynchronous operation occurring between a people having the same aspiration and interest group of planes, mainly rely on the step-out disconnection device to move the control accident.
If electric power system does not have asynchronous operation between a people having the same aspiration and interest group of planes when meeting with disturbance, but thereby the step-out disconnection device judge into asynchronous operation by accident and make some control measure, this be the user do not expect to take place.Domestic step-out disconnection device generally adopts single-end electrical quantity to differentiate now, when the disturbance of system's generation symmetrical fault but between a people having the same aspiration and interest group of planes not during asynchronous operation, especially 500kV and above electric pressure transmission line, because its damping time constant is long, direct-to-ground capacitance causes characteristics such as the secondary arc current on the transmission line is relatively large more greatly, thereby adopts the step-out disconnection device of single-end electrical quantity might judge into the control measure that asynchronous operation takes some users not expect by accident.Especially in order to save the arable land, improve transmission line capability, begun to adopt in a large number the double-circuit line on same pole road now.When wherein a certain loop line road meets with the symmetry disturbance or the disturbance of symmetrical fault takes place outside line areas, there is not asynchronous operation between a group of planes synchronously, if the control measure that the step-out disconnection device is judged into asynchronous operation by accident and taked some users not expect, will cause the extension of disturbance accident, enlarge the power failure scope, cause economic loss, reduce stability margin of electric power system etc.
The present invention can make step-out disconnection device reliable locking step-out off-the-line function when electric power system generation symmetrical fault prevent its misoperation, and reliably the judgement of the open step-out off-the-line of unlocking function can tripping again when electric power system between experience disturbance and the people having the same aspiration and interest group of planes asynchronous operation takes place simultaneously.
Summary of the invention
The present invention can make step-out disconnection device reliable locking step-out off-the-line function when electric power system generation symmetrical fault prevent its misoperation, and reliably the judgement of the open step-out off-the-line of unlocking function can tripping again when electric power system between experience disturbance and the people having the same aspiration and interest group of planes asynchronous operation takes place simultaneously.
The technical solution adopted for the present invention to solve the technical problems is as follows, comprises the step of following realization step-out disconnection device locking:
1, the initial sinusoids input signal is that voltage, current analog amount signal carry out low-pass filtering through low-pass filtering module earlier, with the interference of secondary and the above harmonic component of secondary in the elimination initial sinusoids input signal.
2, calculate the three-phase current fundamental current effective value behind the aperiodic component of filtering among three-phase current ia, ib, the ic in real time, and be designated as IA, IB, IC.
3, (Tsn), (Tsn), IC (Tsn) sues for peace respectively and obtains IAsum, IBsum, ICsum IB three-phase current first-harmonic effective value IA before constantly of the three-phase current first-harmonic effective value IA that current time measuring and calculating is obtained, IB, IC and default definite value Tsn.The three-phase current first-harmonic effective value of Tsn/2 before the moment is designated as IA, and (Tsn/2), (Tsn/2), IC (Tsn/2) for IB.
4, note initial moment Tstart when device carries out the differentiation of step-out off-the-line, time counter TibsA, TibsB, TibsC zero clearing are judged a moment that has finished cycle of oscillation when device and are recorded as Tend at this moment.Note Δ ifixed is default fixedly threshold definite value.[Tstart, Tend] constantly in, (Tsn/2) relational expression is false then that time counter TibsA just begins the timing that adds up to IAsum+ Δ Ifixed≤2 * IA each time; (Tsn/2) relational expression is false then that time counter TibsB just begins the timing that adds up to IBsum+ Δ Ifixed≤2 * IB each time; (Tsn/2) relational expression is false then that time counter TibsC just begins the timing that adds up to ICsum+ Δ Ifixed≤2 * IC each time.Definition kTibsA=TibsA/ (Tend-Tstart); KTibsB=TibsB/ (Tend-Tstart); KTibsC=TibsC/ (Tend-Tstart).When kTibsA, kTibsB, kTibsC are arbitrary when satisfying more than or equal to a default definite value kTibsSET, the step-out off-the-line function of locking device then.
The combination of any one or each step of the step of open step-out off-the-line function in can following steps after the locking of step-out disconnection device:
1, detects voltage change ratio, if the rate of change that voltage increases thinks then that more than or equal to an artificial default definite value fault excises the step-out off-the-line function of open system.
2, whether detect the three-phase voltage value all more than or equal to a default definite value, if all more than or equal to thinking that then fault excises the step-out off-the-line function of open system.
3, timer namely picks up counting after step-out off-the-line function is by locking, if timer, thinks then that fault excises the step-out off-the-line function of open system more than or equal to backup protection operate time.
Beneficial effect of the present invention is as follows: to simple quiet steady destroyed and asynchronous oscillation that cause can tripping.Can reliably avoid the phenomenon of step-out disconnection device malfunction when electric power system generation symmetrical fault, can open step-out off-the-line function behind the failure removal fast and judge, can tripping when again asynchronous operation taking place between an electric power system people having the same aspiration and interest group of planes behind the failure removal.
Description of drawings
Fig. 1 is embodiment one flow chart;
Fig. 2 is embodiment two flow charts;
Fig. 3 is embodiment three flow charts.
Embodiment
The technical solution adopted for the present invention to solve the technical problems embodiment is as follows:
Embodiment one:
The step that realizes the locking of step-out disconnection device is as follows:
1, the initial sinusoids input signal is that voltage, current analog amount signal carry out low-pass filtering through low-pass filtering module earlier, with the interference of secondary and the above harmonic component of secondary in the elimination initial sinusoids input signal.
2, calculate the first-harmonic effective value of three-phase voltage ua, ub, uc and be designated as UA, UB, UC.The fundamental voltage effective value of current time is done subtraction with the default first-harmonic effective value of definite value Tdu before the moment to be obtained the rate of change of three-phase voltage and is designated as dUA, dUB, dUC.
3, when 0 deducts dUA, 0 and deducts dUB, 0 and deduct any one result among the dUC and satisfy more than or equal to default definite value dUSET1, the step-out off-the-line function of locking device then.
The step of open step-out disconnection device function is as follows:
When 4, any one satisfies more than or equal to default definite value dUSET2 as dUA, dUB, dUC, the step-out off-the-line function of open system then.
5, when UA, UB, UC three-phase all satisfy more than or equal to default definite value URISE, the step-out off-the-line function of open system then.
6, timer namely picks up counting after step-out off-the-line function is by locking, if timer is more than or equal to backup protection Thb operate time, and the step-out off-the-line function of open system then.
Embodiment two:
The step that realizes the locking of step-out disconnection device is as follows:
1, the initial sinusoids input signal is that voltage, current analog amount signal carry out low-pass filtering through low-pass filtering module earlier, with the interference of secondary and the above harmonic component of secondary in the elimination initial sinusoids input signal.
2, the effective value of the aperiodic component among calculating three-phase current ia, ib, the ic is designated as IeA, IeB, IeC.
3, the fundamental current effective value that filters behind the aperiodic component that calculates among three-phase current ia, ib, the ic is designated as IA, IB, IC.
4, calculate the ratio of aperiodic component effective value and fundametal compoment effective value in the three-phase current, be designated as kIeA=IeA/IA, kIeB=IeB/IB, kIeC=IeC/IC.
5, any one satisfies more than or equal to default definite value kIeSET1 and after time-delay Tie1 confirms as kIeA, kIeB, kIeC, then the step-out off-the-line function of locking device.
6, satisfy more than or equal to default definite value kIeSET2 and after time-delay Ti e2 confirms as any two of kIeA, kIeB, kIeC, then the step-out off-the-line function of locking device.
7, all satisfy more than or equal to default definite value kIeSET3 and after time-delay Tie3 confirms as three of kIeA, kIeB, kIeC, then the step-out off-the-line function of locking device.
The step of open step-out disconnection device function is as follows:
When 8, any one satisfies more than or equal to default definite value dUSET2 as dUA, dUB, dUC, the step-out off-the-line function of open system then.
9, when UA, UB, UC three-phase all satisfy more than or equal to default definite value URISE, the step-out off-the-line function of open system then.
10, timer namely picks up counting after step-out off-the-line function is by locking, if timer is more than or equal to backup protection Thb operate time, and the step-out off-the-line function of open system then.
Embodiment three:
The step that realizes the locking of step-out disconnection device is as follows:
1, the initial sinusoids input signal is that voltage, current analog amount signal carry out low-pass filtering through low-pass filtering module earlier, with the interference of secondary and the above harmonic component of secondary in the elimination initial sinusoids input signal.
2, the fundamental current effective value that filters behind the aperiodic component that calculates among three-phase current ia, ib, the ic is designated as IA, IB, IC.
3, (Tsn), (Tsn), (Tsn) summation obtains IAsum, IBsum, ICsum to IC to IB to the three-phase current first-harmonic effective value IA that current time is calculated, IB, IC and the default definite value Tsn three-phase current first-harmonic effective value IA before constantly.The three-phase current first-harmonic effective value of Tsn/2 before the moment is designated as IA, and (Tsn/2), (Tsn/2), IC (Tsn/2) for IB.
4, note initial moment Tstart when device carries out the differentiation of step-out off-the-line, time counter TibsA, TibsB, TibsC zero clearing are judged a moment that has finished cycle of oscillation when device and are recorded as Tend at this moment.Note Δ ifixed is default fixedly threshold definite value.[Tstart, Tend] constantly in, (Tsn/2) relational expression is false then that time counter TibsA just begins the timing that adds up to IAsum+ Δ Ifixed≤2 * IA each time; (Tsn/2) relational expression is false then that time counter TibsB just begins the timing that adds up to IBsum+ Δ Ifixed≤2 * IB each time; (Tsn/2) relational expression is false then that time counter TibsC just begins the timing that adds up to ICsum+ Δ Ifixed≤2 * IC each time.Definition kTibsA=TibsA/ (Tend-Tstart); KTibsB=TibsB/ (Tend-Tstart); KTibsC=TibsC/ (Tend-Tstart).When kTibsA, kTibsB, kTibsC are arbitrary when satisfying more than or equal to default definite value kTibsSET, the step-out off-the-line function of locking device then.
The step of open step-out disconnection device function is as follows:
When 5, any one satisfies more than or equal to default definite value dUSET2 as dUA, dUB, dUC, the step-out off-the-line function of open system then.
6, when UA, UB, UC three-phase all satisfy more than or equal to default definite value URISE, the step-out off-the-line function of open system then.
7, timer namely picks up counting after step-out off-the-line function is by locking, if timer is more than or equal to backup protection Thb operate time, and the step-out off-the-line function of open system then.
Claims (4)
1. prevent the method for electric power system step-out disconnection device malfunction in symmetrical fault, comprise the step that realizes the locking of step-out disconnection device and the step of opening step-out disconnection device function, it is characterized in that the step of described realization step-out disconnection device locking comprises:
1) the initial sinusoids input signal is that voltage, current analog amount signal carry out low-pass filtering through low-pass filtering module earlier, with the interference of secondary and the above harmonic component of secondary in the elimination initial sinusoids input signal;
2) calculate the three-phase current fundamental current effective value behind the aperiodic component of filtering among three-phase current ia, ib, the ic in real time, and be designated as IA, IB, IC;
3) (Tsn), (Tsn), (Tsn) summation obtains IAsum, IBsum, ICsum to IC to IB to three-phase current first-harmonic effective value IA before constantly of the three-phase current first-harmonic effective value IA that current time measuring and calculating is obtained, IB, IC and default definite value Tsn respectively, and Tsn/2 preceding three-phase current first-harmonic effective value constantly is designated as IA (Tsn/2), (Tsn/2), IC (Tsn/2) for IB;
4) note initial moment Tstart when device carries out the differentiation of step-out off-the-line, time counter TibsA, TibsB, TibsC zero clearing are judged a moment that has finished cycle of oscillation when device and are recorded as Tend at this moment; Note Δ ifixed is default fixedly threshold definite value; At [Tstart, Tend] in the moment, (Tsn/2) relational expression is false then that time counter TibsA just begins the timing that adds up to IAsum+ Δ Ifixed≤2 * IA each time, (Tsn/2) relational expression is false then that time counter TibsB just begins the timing that adds up to IBsum+Δ Ifixed≤2 * IB, and (Tsn/2) relational expression is false then that time counter TibsC just begins the timing that adds up to ICsum+ Δ Ifixed≤2 * IC each time each time; Definition kTibsA=TibsA/ (Tend-Tstart); KTibsB=TibsB/ (Tend-Tstart); KTibsC=TibsC/ (Tend-Tstart), when kTibsA, kTibsB, kTibsC are arbitrary when satisfying more than or equal to a default definite value kTibsSET, the step-out off-the-line function of locking device then.
2. the method that prevents the malfunction in symmetrical fault of electric power system step-out disconnection device according to claim 1 is characterized in that, the step of described open step-out disconnection device function is:
Detect voltage change ratio, if the rate of change that voltage increases thinks then that more than or equal to an artificial default definite value fault excises the step-out off-the-line function of open system.
3. the method that prevents the malfunction in symmetrical fault of electric power system step-out disconnection device according to claim 1 is characterized in that, the step of described open step-out disconnection device function is:
Whether detect the three-phase voltage value all more than or equal to a default definite value, if all more than or equal to thinking that then fault excises the step-out off-the-line function of open system.
4. the method that prevents the malfunction in symmetrical fault of electric power system step-out disconnection device according to claim 1 is characterized in that, the step of described open step-out disconnection device function is:
Timer namely picks up counting after step-out off-the-line function is by locking, if timer, thinks then that fault excises the step-out off-the-line function of open system more than or equal to backup protection operate time.
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| CN102064524B (en) * | 2010-11-10 | 2014-03-12 | 中电普瑞科技有限公司 | Electrical power system desynchronization and rapid disconnection judging method |
| CN102570454B (en) * | 2012-01-10 | 2014-03-26 | 中国电力科学研究院 | Simulation collocation method for oscillation disconnection device of power system |
| CN109936129B (en) * | 2019-03-19 | 2020-08-07 | 南京讯汇科技发展有限公司 | Power failure and accident handling method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5731943A (en) * | 1996-01-04 | 1998-03-24 | Schweitzer Engineering Laboratories, Inc. | Protective relay having out-of-step logic capability |
| CN1932540A (en) * | 2006-09-11 | 2007-03-21 | 国电南瑞科技股份有限公司 | Method for differentiating electrical system oscillation and fault according to phase |
| CN101494375A (en) * | 2008-01-24 | 2009-07-29 | 三菱电机株式会社 | PCM current differential protection relay |
| CN101540495A (en) * | 2009-04-29 | 2009-09-23 | 西安交通大学 | Loss of synchronism protection system and method based on geometrical characteristics of movement locus of generator |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5731943A (en) * | 1996-01-04 | 1998-03-24 | Schweitzer Engineering Laboratories, Inc. | Protective relay having out-of-step logic capability |
| CN1932540A (en) * | 2006-09-11 | 2007-03-21 | 国电南瑞科技股份有限公司 | Method for differentiating electrical system oscillation and fault according to phase |
| CN101494375A (en) * | 2008-01-24 | 2009-07-29 | 三菱电机株式会社 | PCM current differential protection relay |
| CN101540495A (en) * | 2009-04-29 | 2009-09-23 | 西安交通大学 | Loss of synchronism protection system and method based on geometrical characteristics of movement locus of generator |
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