CN105548811B - The quantitative appraisal method of hyposynchronous resonance of power system and its severity - Google Patents
The quantitative appraisal method of hyposynchronous resonance of power system and its severity Download PDFInfo
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- CN105548811B CN105548811B CN201510995031.XA CN201510995031A CN105548811B CN 105548811 B CN105548811 B CN 105548811B CN 201510995031 A CN201510995031 A CN 201510995031A CN 105548811 B CN105548811 B CN 105548811B
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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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- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The present invention proposes a kind of quantitative appraisal method of hyposynchronous resonance of power system and its severity, detect the voltage at series capacitor both ends, the ratio DEG of half of cycle time of the time of calculable capacitor voltage half cycle and normal 50Hz systems, when ratio DEG is more than 102%, then it is assumed that subsynchronous resonance occurs；The mark SIG that subsynchronous resonance is arranged is 1, and otherwise setting mark SIG is 0.The quantizating index INDEX that time integral obtains hyposynchronous resonance of power system severity is carried out to subsynchronous resonance mark SIG using ratio DEG as weight；If INDEX is more than 0.5, expression is more serious subsynchronous resonance, has larger impact to system stabilization, takes corresponding stability contorting measure.Complicated calculations are not necessarily in the present invention, so that it may fast and effeciently to judge hyposynchronous resonance of power system and its severity, strong tool can be provided for the analysis and research and risk assessment of hyposynchronous resonance of power system, there is stronger engineering practicability.
Description
Technical field
The present invention relates to a kind of hyposynchronous resonance of power system and the quantitative appraisal methods of its severity.
Background technology
China causes the cross-domain transmission of electric energy, and power transmission distance due to primary energy distribution, stablizes weak.Series connection is mended
The technology of repaying is to shorten the electrical distance of ac transmission, increase power transmission capacity of pow and improve the economy of power system transient stability and effective
Method, in addition the cost and requisition problem in China transmission of electricity corridor also become increasingly conspicuous, therefore the availability of series compensation will greatly
It improves.It is that possible cause subsynchronous resonance using that one of can be led to the problem of to Operation of Electric Systems after series compensation, to lead
Turbine generator shafting torsional oscillation and the electrical oscillation less than normal system frequency are caused, power grid security is seriously affected.Therefore, to electricity
The in-depth analysis research of Force system subsynchronous resonance seems most important.
It is subsynchronous to how large-scale power system differentiates both at home and abroad in the analysis and research of existing hyposynchronous resonance of power system
Resonance occurs, and especially also lacks quantization method of discrimination and quantitative appraisal index to the severity that subsynchronous resonance occurs.It is true
On, there is no too big harm to electric system for a other of short duration subsynchronous resonance.But existing subsynchronous resonance differentiation side
Method can not quantify the severity of subsynchronous resonance deeply to measure hyposynchronous resonance of power system comprehensively to meet
Change analysis and research and risk assessment.Therefore how to differentiate the severity of hyposynchronous resonance of power system, providing quantizating index is
There is engineering significance.
Invention content
It is an object of the invention to propose a kind of quantitative appraisal method of hyposynchronous resonance of power system and its severity,
The method of discrimination forms hyposynchronous resonance of power system by the voltage at the series capacitor both ends detected by certain operations
Severity quantifies the severity of hyposynchronous resonance of power system by the index, to same to electric system time
Step resonance carries out analysis and research and risk assessment.
In order to achieve the above object, the technical solution of the present invention is to provide a kind of hyposynchronous resonance of power system and its seriously
The quantitative appraisal method of degree, including following procedure：
Detect the voltage at series capacitor both ends；
The ratio DEG of half of the cycle time of time and standard 50Hz systems of calculable capacitor voltage half cycle=
tVcap_half / tstand；Wherein, tVcap_halfFor the time of condenser voltage half cycle；tstandFor half of cycle of standard 50Hz when
Between；
When ratio DEG is more than 102%, indicate that subsynchronous resonance occurs.
Preferably, when judging that ratio DEG is more than 102%, make subsynchronous resonance mark SIG=1；
When judging that ratio DEG is not more than 102%, indicate, in the normal condition that subsynchronous resonance does not occur, to make subsynchronous
Resonance flag SIG=0.
Preferably, using ratio DEG as weight, time integral is carried out to subsynchronous resonance mark SIG, obtains and indicates electric power
Quantizating index INDEX=∫ (DEGSIG) dt of system subsynchronous resonance severity；
When quantizating index INDEX is more than 0.5, the subsynchronous resonance that influence system stabilization has occurred is indicated, then enable secondary
Synchronous resonant control measure.
Preferably, if quantizating index INDEX is not more than 0.5, the both end voltage of series capacitor is detected again.
Compared with prior art, hyposynchronous resonance of power system proposed by the present invention and the method for discrimination of its severity and
Differentiate flow, can without complicated calculations, fast and effeciently judge hyposynchronous resonance of power system and its sternly
Weight degree, can provide strong tool for the analysis and research and risk assessment of hyposynchronous resonance of power system, have stronger work
Journey practicability.
Description of the drawings
Fig. 1 is the schematic diagram of the differentiation flow of hyposynchronous resonance of power system and its severity.
Specific implementation mode
The quantitative appraisal method of hyposynchronous resonance of power system proposed by the present invention and its severity is：
Detect the voltage at series capacitor both ends, under normal circumstances half week of condenser voltage should be equal to standard 50Hz systems
It unites half of cycle time（10ms）.The ratio of the time of calculable capacitor voltage half cycle and normal half of cycle time of 50Hz systems
DEG, when ratio DEG is more than 102%, then it is assumed that subsynchronous resonance occurs；The mark SIG of subsynchronous resonance is set, when SIG=1
It indicates that subsynchronous resonance occurs, when subsynchronous resonance, i.e. normal condition do not occur for the expressions of SIG=0.
Also, the ratio DEG of half of cycle time of the time of condenser voltage half cycle and normal 50Hz systems can be used to table
The severity for showing moment subsynchronous resonance thinks that moment subsynchronous resonance is more serious when the ratio DEG the big.
For this purpose, the factor of subsynchronous resonance duration is considered, using ratio DEG as weight to subsynchronous resonance mark
SIG carries out the quantizating index INDEX that time integral obtains hyposynchronous resonance of power system severity；According to quantizating index
INDEX differentiates hyposynchronous resonance of power system severity, if INDEX is less than 0.2, then it is assumed that is slight subsynchronous humorous
It shakes, power system stability is not had much influence, INDEX is more than 0.5, then it is assumed that be more serious subsynchronous resonance, to being
System stabilization has larger impact, needs to take corresponding stability contorting measure.
According to above-mentioned hyposynchronous resonance of power system and the quantitative appraisal method of its severity, electric system can be formulated
The differentiation flow of subsynchronous resonance and its severity.Fig. 1 gives sentencing for hyposynchronous resonance of power system and its severity
Other flow：
S1, the both end voltage for detecting series capacitor；
S2, t is setVcap_halfFor the time of condenser voltage half cycle；
If tstandFor the time of half of cycle of normal 50Hz（This example takes 10ms）；
Calculating ratio DEG=tVcap_half / tstand。
S3, judge whether ratio DEG is more than 102%：
If be judged as "Yes", it is believed that subsynchronous resonance occurs, makes mark SIG=1 of subsynchronous resonance；
If be judged as "No", it is believed that in the normal condition that subsynchronous resonance does not occur, make mark SIG=0.
S4, quantizating index INDEX=∫ (DEGSIG) dt for calculating synchronous resonant severity
S5, quantizating index INDEX is compared with given threshold LIMIT；Given threshold LIMIT takes 0.5 in this example,
That is, it is judged that whether quantizating index INDEX is more than 0.5：
If be judged as "Yes", after starting related subsynchronous resonance control function, terminate to differentiate flow；
If be judged as "No", re-execute S1 and the both end voltage of series capacitor is detected.
Hyposynchronous resonance of power system proposed by the present invention and the method for discrimination of its severity and differentiation flow, Ke Yi
In the case of without complicated calculations, hyposynchronous resonance of power system and its severity are fast and effeciently judged, can be electric power
The analysis and research and risk assessment of system subsynchronous resonance provide strong tool, have stronger engineering practicability.
The present invention is carried on the basis of comprehensive domestic series compensation system subsynchronous resonance research largely calculates conclusion
Go out, the quantitative appraisal method of hyposynchronous resonance of power system and its severity which proposes has been subjected to a large amount of theory
It calculates and case history is verified.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (3)
1. a kind of quantitative appraisal method of hyposynchronous resonance of power system and its severity, which is characterized in that include following mistake
Journey：
Detect the voltage at series capacitor both ends；
The ratio DEG=t of half of the cycle time of time and standard 50Hz systems of calculable capacitor voltage half cycleVcap_half/
tstand；Wherein, tVcap_halfFor the time of condenser voltage half cycle；tstandFor the time of half of cycle of standard 50Hz；
When ratio DEG is more than 102%, indicates that subsynchronous resonance occurs, make subsynchronous resonance mark SIG=1；When judging ratio
When DEG is not more than 102%, indicate, in the normal condition that subsynchronous resonance does not occur, to make subsynchronous resonance mark SIG=0；
Using ratio DEG as weight, time integral is carried out to subsynchronous resonance mark SIG, obtains and indicates that electric system is subsynchronous
Quantizating index INDEX=∫ (DEGSIG) dt of resonance severity；
When judging that quantizating index INDEX is more than given threshold, subsynchronous resonance control measure are enabled.
2. quantitative appraisal method as described in claim 1, which is characterized in that
The given threshold is 0.5；When quantizating index INDEX is more than 0.5, indicate that the subsynchronous of influence system stabilization has occurred
Resonance then enables subsynchronous resonance control measure.
3. quantitative appraisal method as claimed in claim 2, which is characterized in that
If quantizating index INDEX is not more than 0.5, the both end voltage of series capacitor is detected again.
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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
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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 |
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| 串补电路中次同步谐振检测和抑制的研究;孙妙平 等;《铁道学报》;20030410;第25卷(第2期);107-110 * |
| 采用改进的NGH次同步谐振阻尼方法;赵学强;《华东电力》;20000124(第1期);9-13、52 * |
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