CN105548811A - Electric-power-system subsynchronous resonance and severe degree quantification identification method - Google Patents
Electric-power-system subsynchronous resonance and severe degree quantification identification method Download PDFInfo
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- CN105548811A CN105548811A CN201510995031.XA CN201510995031A CN105548811A CN 105548811 A CN105548811 A CN 105548811A CN 201510995031 A CN201510995031 A CN 201510995031A CN 105548811 A CN105548811 A CN 105548811A
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- subsynchronous resonance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention provides an electric-power-system subsynchronous resonance and severe degree quantification identification method. The method is characterized by detecting voltages of two ends of a series capacitor; calculating a proportion DEG of capacitor-voltage semi-cycle time and normal 50Hz-system semi-cyclic-wave time, when the proportion DEG is greater than 102%, considering that subsynchronous resonance is generated; setting a mark SIG of the subsynchronous resonance as 1 and otherwise setting the mark SIG as 0. The proportion DEG is taken as a weight to carry out a time integral on the subsynchronous resonance mark SIG so as to acquire a quantification index INDEX of an electric-power-system subsynchronous resonance severity degree. If the INDEX is greater than 0.5, the subsynchronous resonance is indicated to be the severe subsynchronous resonance which has a large influence on system stability so that corresponding stable control measures are adopted. In the invention, complex calculating is not needed and the electric-power-system subsynchronous resonance and the severity degree can be rapidly and effectively determined; a powerful tool is provided for analysis researching and risk assessment of the electric-power-system subsynchronous resonance; and high engineering practicality is possessed.
Description
Technical field
The present invention relates to a kind of quantitative appraisal method of hyposynchronous resonance of power system and the order of severity thereof.
Background technology
China causes the cross-domain transmission of electric energy because primary energy distributes, and power transmission distance, stable weak.Series Compensation shortens the electrical distance of ac transmission, increases power transmission capacity of pow and improves the economy of power system transient stability and effective method, add that cost and the requisition problem in China's transmission of electricity corridor also become increasingly conspicuous, therefore the availability of series compensation will greatly improve.One of problem that can produce to Operation of Electric Systems after adopting series compensation possible cause subsynchronous resonance, thus cause turbine generator shafting torsional oscillation and the electrical oscillation lower than normal system frequency, has a strong impact on power grid security.Therefore, the in-depth analysis research of hyposynchronous resonance of power system is seemed most important.
In domestic and international existing hyposynchronous resonance of power system analysis and research, how to differentiate that subsynchronous resonance occurs to large-scale power system, the order of severity especially occurred subsynchronous resonance also lacks quantification method of discrimination and quantitative appraisal index.In fact, the harm that other of short duration subsynchronous resonance individual is too not large to electric system.But existing subsynchronous resonance method of discrimination cannot quantize to carry out deeply quantitative analysis research and risk assessment comprehensively to meet to hyposynchronous resonance of power system to the order of severity of subsynchronous resonance.Therefore how to differentiate the order of severity of hyposynchronous resonance of power system, providing quantizating index has engineering significance.
Summary of the invention
The object of the invention is to a kind of quantitative appraisal method proposing hyposynchronous resonance of power system and the order of severity thereof, the voltage at series capacitor two ends of this method of discrimination by detecting, hyposynchronous resonance of power system severity is formed through certain operations, quantized the order of severity of hyposynchronous resonance of power system by this index, thus hyposynchronous resonance of power system is analyzed and researched and risk assessment.
In order to achieve the above object, technical scheme of the present invention is to provide a kind of quantitative appraisal method of hyposynchronous resonance of power system and the order of severity thereof, comprises following process:
Detect the voltage at series capacitor two ends;
The time of calculable capacitor voltage half cycle and the ratio DEG=t of half cycle time of standard 50Hz system
vcap_half/ t
stand; Wherein, t
vcap_halffor the time of condenser voltage half cycle; t
standfor the time of standard 50Hz half cycle;
When ratio DEG is greater than 102%, represents and subsynchronous resonance occurs.
Preferably, when judging that ratio DEG is greater than 102%, make subsynchronous resonance mark SIG=1;
When judging that ratio DEG is not more than 102%, representing and being in the normal condition that subsynchronous resonance does not occur, making subsynchronous resonance mark SIG=0.
Preferably, using ratio DEG as weight, time integral is carried out to subsynchronous resonance mark SIG, obtain quantizating index INDEX=∫ (DEGSIG) dt representing the hyposynchronous resonance of power system order of severity;
When quantizating index INDEX is greater than 0.5, represents and there occurs the stable subsynchronous resonance of influential system, then enable subsynchronous resonance control measure.
Preferably, if when quantizating index INDEX is not more than 0.5, again the both end voltage of series capacitor is detected.
Compared with prior art, the method of discrimination of the hyposynchronous resonance of power system that the present invention proposes and the order of severity thereof and differentiation flow process, can when without complicated calculations, fast and effeciently judge hyposynchronous resonance of power system and the order of severity thereof, the analysis and research and the risk assessment that can be hyposynchronous resonance of power system provide strong instrument, have stronger engineering practicability.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the differentiation flow process of hyposynchronous resonance of power system and the order of severity thereof.
Embodiment
The quantitative appraisal method of the hyposynchronous resonance of power system that the present invention proposes and the order of severity thereof is:
Detect the voltage at series capacitor two ends, condenser voltage half time-of-week should equal standard 50Hz system half cycle time (10ms) under normal circumstances.The time of calculable capacitor voltage half cycle and the ratio DEG of normal half cycle time of 50Hz system, when ratio DEG is greater than 102%, then think generation subsynchronous resonance; The mark SIG of subsynchronous resonance is set, when SIG=1 represents generation subsynchronous resonance, when SIG=0 represents, subsynchronous resonance does not occur, i.e. normal condition.
Further, the time of condenser voltage half cycle and the ratio DEG of normal half cycle time of 50Hz system can be used to the order of severity representing moment subsynchronous resonance, when ratio DEG is larger, think that subsynchronous resonance is more serious instantaneously.
For this reason, consider the factor of subsynchronous resonance duration, ratio DEG is carried out to subsynchronous resonance mark SIG the quantizating index INDEX that time integral obtains the hyposynchronous resonance of power system order of severity as weight; The hyposynchronous resonance of power system order of severity is differentiated according to quantizating index INDEX, if INDEX is less than 0.2, then think slight subsynchronous resonance, too much influence is not had to power system stability, INDEX is greater than 0.5, then think more serious subsynchronous resonance, have considerable influence to system stability, need to take corresponding stability contorting measure.
According to the quantitative appraisal method of above-mentioned hyposynchronous resonance of power system and the order of severity thereof, the differentiation flow process of hyposynchronous resonance of power system and the order of severity thereof can be formulated.Fig. 1 gives the differentiation flow process of hyposynchronous resonance of power system and the order of severity thereof:
The both end voltage of S1, detection series capacitor;
S2, establish t
vcap_halffor the time of condenser voltage half cycle;
If t
standfor the time (this example gets 10ms) of normal 50Hz half cycle;
Calculating ratio DEG=t
vcap_half/ t
stand.
S3, judge whether ratio DEG is greater than 102%:
If when being judged as "Yes", thinking and make the mark SIG=1 of subsynchronous resonance by generation subsynchronous resonance;
If when being judged as "No", thinking and make mark SIG=0 by the normal condition being in and subsynchronous resonance does not occur.
Quantizating index INDEX=∫ (DEGSIG) dt of S4, the calculating synchronous resonant order of severity
S5, by quantizating index INDEX with setting threshold value LIMIT compare; Set threshold value LIMIT in this example and get 0.5, that is, judge whether quantizating index INDEX is greater than 0.5:
If when being judged as "Yes", after starting relevant subsynchronous resonance controlling functions, terminate to differentiate flow process;
If when being judged as "No", re-executing the both end voltage of S1 to series capacitor and detect.
The method of discrimination of the hyposynchronous resonance of power system that the present invention proposes and the order of severity thereof and differentiation flow process, can when without complicated calculations, fast and effeciently judge hyposynchronous resonance of power system and the order of severity thereof, the analysis and research and the risk assessment that can be hyposynchronous resonance of power system provide strong instrument, have stronger engineering practicability.
The present invention proposes on the comprehensive domestic a large amount of basis calculating conclusion of series compensation system subsynchronous resonance research, and the quantitative appraisal method of the hyposynchronous resonance of power system that this invention proposes and the order of severity thereof is through a large amount of theory calculate and case history checking.
Although content of the present invention has done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (4)
1. a quantitative appraisal method for hyposynchronous resonance of power system and the order of severity thereof, is characterized in that, comprises following process:
Detect the voltage at series capacitor two ends;
The time of calculable capacitor voltage half cycle and the ratio DEG=t of half cycle time of standard 50Hz system
vcap_half/ t
stand; Wherein, t
vcap_halffor the time of condenser voltage half cycle; t
standfor the time of standard 50Hz half cycle;
When ratio DEG is greater than 102%, represents and subsynchronous resonance occurs.
2. quantitative appraisal method as claimed in claim 1, is characterized in that,
When judging that ratio DEG is greater than 102%, make subsynchronous resonance mark SIG=1;
When judging that ratio DEG is not more than 102%, representing and being in the normal condition that subsynchronous resonance does not occur, making subsynchronous resonance mark SIG=0.
3. quantitative appraisal method as claimed in claim 2, is characterized in that,
Using ratio DEG as weight, time integral is carried out to subsynchronous resonance mark SIG, obtain quantizating index INDEX=∫ (DEGSIG) dt representing the hyposynchronous resonance of power system order of severity;
When quantizating index INDEX is greater than 0.5, represents and there occurs the stable subsynchronous resonance of influential system, then enable subsynchronous resonance control measure.
4. quantitative appraisal method as claimed in claim 3, is characterized in that,
If when quantizating index INDEX is not more than 0.5, again the both end voltage of series capacitor is detected.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4607217A (en) * | 1983-09-28 | 1986-08-19 | Southern California Edison Company, Inc. | Subsynchronous resonance detection |
| CN101447675A (en) * | 2008-12-12 | 2009-06-03 | 中国电力科学研究院 | Method for mitigating sub-synchronous resonance |
| CN101718583A (en) * | 2009-11-27 | 2010-06-02 | 四川大学 | Method for rapidly assessing sub-synchronous resonance of complex AC/DC interconnected system comprising multiple series compensation |
| CN102055197A (en) * | 2010-12-16 | 2011-05-11 | 华北电力大学 | Method for establishing controllable serial compensation linearized model |
| CN102753982A (en) * | 2010-02-17 | 2012-10-24 | Abb研究有限公司 | A method of subsynchronous resonance detection |
| CN103904651A (en) * | 2014-04-15 | 2014-07-02 | 华北电力大学 | Method for screening sub-synchronous resonance risk based on series compensation effect coefficients |
| CN104350661A (en) * | 2013-02-01 | 2015-02-11 | Abb技术有限公司 | Method and apparatus for mitigating sub-synchronous resonance in power transmission system |
-
2015
- 2015-12-28 CN CN201510995031.XA patent/CN105548811B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4607217A (en) * | 1983-09-28 | 1986-08-19 | Southern California Edison Company, Inc. | Subsynchronous resonance detection |
| CN101447675A (en) * | 2008-12-12 | 2009-06-03 | 中国电力科学研究院 | Method for mitigating sub-synchronous resonance |
| CN101718583A (en) * | 2009-11-27 | 2010-06-02 | 四川大学 | Method for rapidly assessing sub-synchronous resonance of complex AC/DC interconnected system comprising multiple series compensation |
| CN102753982A (en) * | 2010-02-17 | 2012-10-24 | Abb研究有限公司 | A method of subsynchronous resonance detection |
| CN102055197A (en) * | 2010-12-16 | 2011-05-11 | 华北电力大学 | Method for establishing controllable serial compensation linearized model |
| CN104350661A (en) * | 2013-02-01 | 2015-02-11 | Abb技术有限公司 | Method and apparatus for mitigating sub-synchronous resonance in power transmission system |
| CN103904651A (en) * | 2014-04-15 | 2014-07-02 | 华北电力大学 | Method for screening sub-synchronous resonance risk based on series compensation effect coefficients |
Non-Patent Citations (2)
| Title |
|---|
| 孙妙平 等: "串补电路中次同步谐振检测和抑制的研究", 《铁道学报》 * |
| 赵学强: "采用改进的NGH次同步谐振阻尼方法", 《华东电力》 * |
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