CN101963644A - Oscillation center capturing method for out-of-step oscillation of power system - Google Patents
Oscillation center capturing method for out-of-step oscillation of power system Download PDFInfo
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- CN101963644A CN101963644A CN2009101817451A CN200910181745A CN101963644A CN 101963644 A CN101963644 A CN 101963644A CN 2009101817451 A CN2009101817451 A CN 2009101817451A CN 200910181745 A CN200910181745 A CN 200910181745A CN 101963644 A CN101963644 A CN 101963644A
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- 230000010355 oscillation Effects 0.000 title claims abstract description 66
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- 238000005259 measurement Methods 0.000 claims description 10
- 208000035126 Facies Diseases 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
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- 230000001360 synchronised effect Effects 0.000 description 2
- PCTMTFRHKVHKIS-BMFZQQSSSA-N (1s,3r,4e,6e,8e,10e,12e,14e,16e,18s,19r,20r,21s,25r,27r,30r,31r,33s,35r,37s,38r)-3-[(2r,3s,4s,5s,6r)-4-amino-3,5-dihydroxy-6-methyloxan-2-yl]oxy-19,25,27,30,31,33,35,37-octahydroxy-18,20,21-trimethyl-23-oxo-22,39-dioxabicyclo[33.3.1]nonatriaconta-4,6,8,10 Chemical compound C1C=C2C[C@@H](OS(O)(=O)=O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@H](C)CCCC(C)C)[C@@]1(C)CC2.O[C@H]1[C@@H](N)[C@H](O)[C@@H](C)O[C@H]1O[C@H]1/C=C/C=C/C=C/C=C/C=C/C=C/C=C/[C@H](C)[C@@H](O)[C@@H](C)[C@H](C)OC(=O)C[C@H](O)C[C@H](O)CC[C@@H](O)[C@H](O)C[C@H](O)C[C@](O)(C[C@H](O)[C@H]2C(O)=O)O[C@H]2C1 PCTMTFRHKVHKIS-BMFZQQSSSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The invention relates to an oscillation center capturing method for the out-of-step oscillation of a power system, which comprises the following steps of: selecting a plurality of measuring points in the power system; and by taking the positive sequence voltage phase of each measuring point as the phase of the measuring point, and taking the phase angle difference between any two measuring points, as the phase angle difference of a phase comparison interval (namely an interval between every two measuring points), judging the phase comparison interval whose phase angle difference meets the condition of theta>180+theta0 or theta<-180+theta0, as an interval where the oscillation center locates, namely the minimum interval including the oscillation center, wherein theta0 is the interval voltage phase angle difference before starting, namely before the starting of system oscillation, and theta is the interval real-time phase angle difference. The method is used for capturing the oscillation center during system out-of-step judgment in a safety and stability control system, and can be used for rapidly and reliably judging the minimum interval including the oscillation center.
Description
Technical field
The present invention relates to the method for catching of the oscillation center of electric system asynchronous oscillation, be applied to the oscillation center seizure when system's step-out is differentiated in the safety stabilization control system.
Background technology
Electric system may lose when meeting with catastrophic failure or multiplicity accident synchronously, an oscillation center is necessarily arranged during electric system generation asynchronous oscillation, when progressively increasing and surpass 180 from initial value, the both end voltage phase differential spends, show electrical network step-out, and oscillation center is between the bus of both sides.The people having the same aspiration and interest group of planes frequency of oscillation center one side is higher than average frequency, and opposite side people having the same aspiration and interest group of planes frequency is lower than average frequency, if the electromotive force approximately equal of the equivalent unit in hypothesis both sides, the position of oscillation center is near the mid point of system impedance so.The particular location of grasping oscillation center is most important to asynchronous oscillation pattern, the selection splitting point of determining system.
The secionalizing system equipment principle that is widely used at present in the domestic electric system engineering practice mainly contains: apparent impedance track off-the-line criterion,
Off-the-line criterion in phasing degree between track off-the-line criterion and voltage and the electric current, its ultimate principle is summarized as follows respectively:
(1) the apparent impedance step-out criterion of discrimination principles in proper order, this method are by measuring the variation track of impedance, drawing corresponding step-out criterion.Distinguish asynchronous oscillation, synchronized oscillation and and short trouble according to the impedance variation track.What this principle was directly reacted theoretically is the variation at merit angle between two equivalent units.
(2)
The step-out criterion of discrimination principles, this method are that the voltage and current that the use device installation place collects calculates
Represent the voltage of oscillation center, distinguish asynchronous oscillation, synchronized oscillation and short trouble according to the Changing Pattern of voltage of oscillation center.
(3) phasing degree vibration off-the-line criterion between voltage and the electric current, this method are the step-out features that the variation track of the IMPEDANCE ANGLE SEPARATION that collects of use device installation place is judged system.This criterion can be judged the locality of out-of-step center.
Tight day by day along with what get in touch between the expansion of electrical network scale and electrical network, the weak point of existing vibration off-the-line principle has appearred: can only differentiate the direction of oscillation center at most, and can not differentiate the position of oscillation center.This is the insurmountable problems of all distribution erecting devices, also is the deficiency of utilizing the step-out criterion principle of single measuring point information.
Summary of the invention
The objective of the invention is: a kind of oscillation center method for catching of electric system asynchronous oscillation is provided, can determines the position at oscillation center place after the electric system step-out accurately and rapidly.
Technical solution of the present invention is as follows: the oscillation center method for catching of electric system asynchronous oscillation, choose a plurality of measurement points in the electric system, getting measurement point positive sequence voltage phase place is the measurement point phase place, phase angle difference between any two measurement points is as than the phase angle difference in interval (i.e. interval between two measurement points) mutually, its feature is as follows: phase angle difference satisfies the interval mutually interval that is judged as the oscillation center place of ratio of formula 1 or formula 2 at first, promptly minimum interval of forgiving oscillation center: adopt formula 1 to differentiate the oscillation center position for quickening step-out:
θ＞180 °+θ
0Formula 1
Wherein, θ
0Be the interval phase difference of voltage of prestart (before system's starting oscillation), θ is interval phase angle difference in real time.
Declare step-out each than in the interval mutually, the interval of satisfying formula 1 at first must be the interval that minimum is forgiven oscillation center.In like manner, for the deceleration step-out, can adopt formula 2 to differentiate the oscillation center position:
θ＜-180 °+θ
0Formula 2
Wherein, θ
0Be prestart (before system's starting oscillation) than mutually interval voltage prima facies angular difference, θ is than interval phase angle difference in real time mutually; Declare step-out each than in the interval mutually, the interval of satisfying formula 2 at first must be the interval that minimum is forgiven oscillation center.
In a word, phase angle difference satisfies the interval mutually interval that is judged as the oscillation center place of ratio of formula 1 or formula 2, promptly minimum interval of forgiving oscillation center at first.
θ＞180+ θ
0Formula 1
θ＜-180+ θ
0Formula 2
Wherein, θ
0Be prestart (before being system's starting oscillation) than mutually interval phase difference of voltage, θ is than interval phase angle difference in real time mutually.
Suppose the system schematic that has as shown in Figure 1, oscillation center is (scope of phase angle difference is limited to 0～360 degree) between BC.
Wherein, each factory's station positive sequence voltage phase relation sketch when Fig. 1 (a) is normal operation, Fig. 1 (b) be for oscillating to 180 each factory's station positive sequence voltage phase relation sketch when spending, and Fig. 1 (c) vibration surpasses 180 each factory's station positive sequence voltage phase relation sketch when spending.
The positive sequence voltage phase place of supposing each factory station of ABCD is respectively θ
A, θ
B, θ
C, θ
D, then the positive sequence voltage real-time phase difference of each section is: θ
AB(between the AB), θ
AC(between the AC), θ
AD(between the AD), θ
BC(between the BC), θ
BD(between the BD), θ
CD(between the CD).
As seen from Figure 1, for quickening step-out, when normal operation, the interval phase difference of voltage initial value near apart from oscillation center (promptly normally sending electric angle) is little, behind system's starting oscillation, each interval phase difference of voltage all equated (all being 180 degree) when arrival 180 was spent, and interval phase difference of voltage near apart from oscillation center after crossing 180 degree is bigger than the interval phase difference of voltage away from oscillation center on the contrary.
As seen near 180 degree, the closer to the interval of oscillation center, the pace of change of its phase difference of voltage is big more, and based on this, for quickening step-out, employing formula 1 is differentiated the oscillation center position; For the deceleration step-out, can adopt formula 2 to differentiate the oscillation center position:
In a word, phase angle difference satisfies the interval mutually interval that is judged as the oscillation center place of ratio of formula 1 or formula 2, promptly minimum interval of forgiving oscillation center at first.
Beneficial effect of the present invention: the present invention is applied to the oscillation center seizure when system's step-out is differentiated in the safety stabilization control system, can judge to fast and reliable the interval that minimum is forgiven oscillation center, promptly detect oscillation center, solve the matching coordinative problem between the step-out disconnection device.
Description of drawings
Below in conjunction with the drawings and specific embodiments patent of the present invention is further described.
Fig. 1 oscillatory process median generatrix voltage-phase Changing Pattern synoptic diagram
Illustrate:
A, B, C, D are respectively the four measuring point in the system, and promptly device is installed in herein, suppose that oscillation center O point is between BC.
The voltage vector of each point relation when Fig. 1 (a) expression system normally moves, by this figure as seen, the prima facies angular difference θ between the BC of this moment
0Be ∠ BOC, the prima facies angular difference θ between the BD
0Be ∠ BOD, ∠ BOC is less than ∠ BOD.
Fig. 1 (b) expression system step-out, just in time 180 degree are reached in the merit angle swing of system both sides, and by this figure as seen, the real-time phase angle difference θ between the BC is ∠ BOC, and the real-time phase angle difference θ between the BD is ∠ BOD, and this moment, ∠ BOC equaled ∠ BOD, and was 180 degree.
Fig. 1 (c) expression system step-out, both sides merit angle swing reach the voltage vector relation that surpasses 180 each points when spending, and by this figure as seen, the real-time phase angle difference θ between the BC is ∠ BOC, and the real-time phase angle difference θ between the BD is ∠ BOD, and ∠ BOC is greater than ∠ BOD.
Embodiment
The mode of implementing is as follows:
(1) selects a plurality of measuring points, each measuring point data is carried out synchronously
(2) calculate each than interval mutually phase angle difference
(3) it is interval mutually to search the ratio that satisfies formula 1 or formula 2 at first successively in each interval, and this interval then is the interval that minimum is forgiven oscillation center, determines the position of oscillation center.
θ＞180+ θ
0Formula 1
θ＜-180+ θ
0Formula 2
Method of discrimination provided by the present invention is effectively verified in the RTDS analogue system.
Claims (1)
1. the oscillation center method for catching of electric system asynchronous oscillation, choose a plurality of measurement points in the electric system, getting measurement point positive sequence voltage phase place is the measurement point phase place, phase angle difference conduct between any two measurement points is than interval mutually, the i.e. phase angle difference in the interval between two measurement points, its feature is as follows: phase angle difference satisfies the interval mutually interval that is judged as the oscillation center place of ratio of formula 1 or formula 2 at first, promptly minimum interval of forgiving oscillation center:
θ＞180+ θ
0Formula 1
θ＜-180+ θ
0Formula 2
Wherein, θ
0Be prestart, be before system's starting oscillation than mutually interval phase difference of voltage, θ is than interval phase angle difference in real time mutually.
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Cited By (6)
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| CN103336161A (en) * | 2013-06-05 | 2013-10-02 | 南方电网科学研究院有限责任公司 | Multi-terminal oscillation voltage measuring method based on optical fiber communication |
| CN104124673A (en) * | 2014-07-29 | 2014-10-29 | 西安交通大学 | Method for determining position of oscillation center |
| CN104459460A (en) * | 2014-11-06 | 2015-03-25 | 中国南方电网有限责任公司 | Electric system out-of-step oscillation section capture method |
| CN107134776A (en) * | 2017-06-27 | 2017-09-05 | 华北电力大学 | The centralized positioning of multi frequency system asynchronous oscillation and displacement path tracing system and method |
| CN110492613A (en) * | 2019-08-23 | 2019-11-22 | 中国能源建设集团广东省电力设计研究院有限公司 | A kind of section Out-of-Step Splitting Systems differentiate control system and method |
| CN111157823A (en) * | 2020-01-06 | 2020-05-15 | 华自科技股份有限公司 | Method and device for judging direction of out-of-step oscillation center and computer equipment |
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| CN1181351C (en) * | 2002-09-30 | 2004-12-22 | 南京南瑞继保电气有限公司 | UCOS 'phi' based electric power system pull-out dectection judging method |
| CN101034128B (en) * | 2007-02-09 | 2010-05-19 | 田伟 | Method for quickly recognizing symmetrical failure in vibration |
| CN101441244B (en) * | 2008-11-21 | 2012-01-11 | 四川省电力公司 | Criterion for measuring breaking step oscillation center position based on in situ electric quantity |
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| CN103336161A (en) * | 2013-06-05 | 2013-10-02 | 南方电网科学研究院有限责任公司 | Multi-terminal oscillation voltage measuring method based on optical fiber communication |
| CN104124673A (en) * | 2014-07-29 | 2014-10-29 | 西安交通大学 | Method for determining position of oscillation center |
| CN104124673B (en) * | 2014-07-29 | 2018-01-26 | 西安交通大学 | A kind of method for determining oscillation center position |
| CN104459460A (en) * | 2014-11-06 | 2015-03-25 | 中国南方电网有限责任公司 | Electric system out-of-step oscillation section capture method |
| CN107134776A (en) * | 2017-06-27 | 2017-09-05 | 华北电力大学 | The centralized positioning of multi frequency system asynchronous oscillation and displacement path tracing system and method |
| CN107134776B (en) * | 2017-06-27 | 2020-11-03 | 华北电力大学 | System and method for positioning out-of-step oscillation center and tracking displacement path of multi-frequency system |
| CN110492613A (en) * | 2019-08-23 | 2019-11-22 | 中国能源建设集团广东省电力设计研究院有限公司 | A kind of section Out-of-Step Splitting Systems differentiate control system and method |
| CN111157823A (en) * | 2020-01-06 | 2020-05-15 | 华自科技股份有限公司 | Method and device for judging direction of out-of-step oscillation center and computer equipment |
| CN111157823B (en) * | 2020-01-06 | 2022-05-10 | 华自科技股份有限公司 | Method and device for judging direction of out-of-step oscillation center and computer equipment |
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| CN101963644B (en) | 2012-05-16 |
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Effective date of registration: 20210824 Address after: 510700 3rd, 4th and 5th floors of building J1 and 3rd floor of building J3, No.11 Kexiang Road, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee after: China South Power Grid International Co.,Ltd. Patentee after: NR ELECTRIC Co.,Ltd. Address before: 510623 Guangdong city of Guangzhou province Tianhe District Pearl River Metro Chinese Sui Road No. 6 Patentee before: POWER GRID TECHNOLOGY RESEARCH CENTER. CHINA SOUTHERN POWER GRID Patentee before: NR ELECTRIC Co.,Ltd. |