CN101399444A - Characteristic evaluation method for influence of capacitor switching to dynamic voltage oscillation - Google Patents
Characteristic evaluation method for influence of capacitor switching to dynamic voltage oscillation Download PDFInfo
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- CN101399444A CN101399444A CNA2007100941236A CN200710094123A CN101399444A CN 101399444 A CN101399444 A CN 101399444A CN A2007100941236 A CNA2007100941236 A CN A2007100941236A CN 200710094123 A CN200710094123 A CN 200710094123A CN 101399444 A CN101399444 A CN 101399444A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention discloses a method for evaluating the characteristic of the influences aroused by capacitor switching on dynamic voltage fluctuation, and comprises evaluation on the characteristic of dynamic electrical energy quality index of power supply bus bar and transient characteristic of voltage, influence factors of voltage fluctuation of power supply bus bar aroused by capacitor switching as well as the rules; wherein, the evaluation on the characteristic of dynamic electrical energy quality index of power supply bus bar comprises that: basing on uifrequent sampling, when 100kHz of rolling data window is adopted for calculating capacitor switching, the voltage of dynamic electrical energy quality index of the voltage of power supply bus bar rises temporarily, the voltage drops temporarily and interrupts in a short time; analysis is carried out according to the voltage permission curve of IEEE, or power supply companies or electricity utilization companies, the indexes of temporary rising, temporary dropping and short interruption of voltage aroused by capacitor switching are judged whether being in the interval permitted by voltage. The method can be taken as the reference and basis when power supply companies compile operation rules, operation specifications and testing regulations or when electrical sensitive users draw up the measures for improving the compatibility level of dynamic voltage.
Description
Technical field
The present invention relates to the evaluation analysis method of dynamic power quality in a kind of power supply system, particularly relate to the characteristic evaluation method of a kind of capacitor switching the dynamic electric voltage influence of fluctuations.
Background technology
Development along with automatic production line, accurate control, high-tech enterprise etc., the electricity consumption client has not only proposed also to have proposed dynamically and the transient electric-energy quality requirement beyond the higher requirement for the reliability of the distortion of current waveform related in electric power system production, the running problem, steady state voltage quality problems and energy.
Dynamic power quality refers to that the duration in the several millisecond incident to a few minutes scopes, comprises that voltage dip (dip) and voltage rise (swell) temporarily, and interruption (interruption) in short-term etc.The transient voltage quality refers to the quality of power supply incident of duration less than 1ms, mainly refers to voltage transient and voltage cut channel.Voltage transient is called transient pulse again, be meant at certain time intervals in, a kind of jumping phenomenon or the number change that take place in the short time at the utmost point between two continuous steady state voltages.This transient pulse can be the folk prescription of arbitrary polarity to pulse, also can be that first peak value is the attenuation oscillasion impulse of any polarity, promptly occur in first spike of arbitrary polarity damp oscillatory wave.
At present, dynamically and the transient electric-energy quality also be in conceptual phase, IEC standards such as (International Electrotechnical Commissions) has been discussed the definition, algorithm, monitoring requirement of dynamic power quality etc.; But owing to lacking reasons such as detailed Monitoring Data and compatible operational management experience, dynamic and transient electric-energy quality does not have concrete control index.In developed countries such as the U.S., employer's organizations such as information, electronics are the interests of safeguarding the industry, have proposed the compatible level of dynamic power quality of industry equipment separately, and the equipment that requires industry separately to choose can be allowed the dynamic power quality fluctuation of prescribed limit.
Be services client better, improve the dynamic and transient electric-energy quality level of electric power system, electric company need carry out assay to the dynamic electric voltage fluctuation situation that capacitor switching produces, reference and foundation as electric company's establishment operating standard, operational procedure, testing regulations etc. also can be used as the electricity consumption sensitive users and formulate reference and the foundation that improves the measure of dynamic electric voltage level of compatibility.
The switching of capacitor can make power supply buses voltage produce fluctuation, but lacks dynamic electric energy index of quality, feature and the influencing factor of concrete fluctuation and the complete evaluation of rule.Research in the past often adopt voltage rise temporarily/fall testing equipment temporarily to test, but therefore because its time resolution can not meet the demands, can not obtain correct description result.Record ripple research in the past lays particular emphasis on the analysis maximum voltage, lacks the complete description for wave process.
Owing to be subjected to research means, operational mode, on-the-spot test condition influence, lack the research that multiple factor affecting capacitor produces the busbar voltage degree of fluctuation.Lack the rule research that produces the power supply buses voltage fluctuation for capacitor switching, just can not be at its rule, formulate effective, the feasible measure that capacitor switching produces the dynamic electric voltage fluctuation that improves, can not can not provide enough technical supports for the electricity consumption client formulates the compatible measure of raising dynamic power quality for electric company provides enough references.
Summary of the invention
The technical problem to be solved in the present invention provides the characteristic evaluation method of a kind of capacitor switching to the dynamic electric voltage influence of fluctuations, for electric company establishment operating standard, operational procedure, testing regulations is for reference and foundation, also can be used as the electricity consumption sensitive users and formulate reference and the foundation that improves the measure of dynamic electric voltage level of compatibility.
For solving the problems of the technologies described above, capacitor switching of the present invention comprises power supply buses dynamic electric energy index of quality feature, voltage transient characteristic evaluating that capacitor switching produces to the characteristic evaluation method of dynamic electric voltage influence of fluctuations; Capacitor switching produces the influencing factor and the rule evaluation of power supply buses voltage fluctuation; Wherein: the power supply buses dynamic electric energy index of quality characteristic evaluating that described capacitor switching produces comprises the steps:
Based on equifrequent sampling, when adopting 100kHz rolling data window calculable capacitor switching, the dynamic electric energy index of quality voltage of power supply buses voltage rises temporarily, voltage dip and interrupting in short-term;
Voltage adaptable curve according to IEEE or electric company, electricity consumption enterprise is analyzed, and the voltage dip that capacitor switching produces, rises temporarily or interrupts index in short-term whether in the interval of voltage adaptable.
Power supply buses dynamic electric energy index of quality characteristic evaluating, voltage transient characteristic evaluating that the present invention produces from capacitor switching; Capacitor switching produces the influencing factor and the rule evaluation of power supply buses voltage fluctuation; Many-sided complete, scientifically estimated the influence of the power supply buses voltage fluctuation that capacitor switching produces, can be used as the reference and the foundation of electric company's establishment operating standard, operational procedure, testing regulations etc., also can be used as the electricity consumption sensitive users and formulate reference and the foundation that improves the measure of dynamic electric voltage level of compatibility.
The present invention is based on actual measurement, adopt dynamic real-time digital simulator system (RTDS) to build the electric power system research model, can draw under the multiple different conditions such as capacitor arrangements mode, power system operating mode, capacitor switching angle, series reactor ratio, different bus loads, for the influence of the voltage fluctuation size that capacitor switching produced.For the dynamic electric voltage fluctuation that the capacitor switching that draws produces, electric company can consider to adopt corresponding improvement measure.
Embodiment
Capacitor switching comprises power supply buses dynamic electric energy index of quality feature, voltage transient characteristic evaluating that capacitor switching produces for the characteristic evaluating of power supply buses dynamic electric voltage influence of fluctuations; The influencing factor of capacitor switching generation power supply buses voltage fluctuation and rule evaluation etc.
Concrete in the method for the invention evaluation procedure is:
One, the power supply buses dynamic electric energy index of quality characteristic evaluating of capacitor switching generation.
This evaluation is to calculate when capacitor switching, and the dynamic electric energy index of quality voltage of power supply buses voltage rises (swell), voltage dip (sag) and interruption (interruption) in short-term temporarily, assay its can by the electricity consumption client compatibility.Its concrete grammar adopts the computation method of dynamic electric energy index of quality based on the 100kHz frequency:
The change in voltage waveform that adopts the high sample frequency oscillograph record of 100kHz power supply buses voltage caused by capacitor switching;
According to international standard [IEC61000-4-30 (2003) Test ing and MeasurementTechniques Power Quality Measurement Methods] about dynamic electric energy index of quality voltage rise temporarily, voltage dip and the definition interrupted in short-term, be calculated as follows voltage and rise (famous value), voltage dip (famous value) temporarily.
Wherein: N is ripple sampling number weekly;
J carries out the digit that continuous half cycles rolling whole wave effective value calculates;
U
k 2Expression sample amplitude when reproduced value square.
According to the signature analysis that is subjected to factor affecting voltage fluctuations such as electric operation, electric network fault in the power supply process, voltage fluctuation is often finished in cycle of less than or several cycle as can be seen, adopt half cycles effective value computational methods conventional in the above-mentioned standard, its time resolution is 10ms, can not describe out the variation characteristic of dynamic voltage quality index.The present invention makes improvements on the basis of above-mentioned existing algorithm, and concrete grammar is: based on the equifrequent sampling, adopt 100kHz rolling data window to carry out calculating voltage and rise temporarily and voltage dip (famous value).That is:
Wherein: N is ripple sampling number weekly.N gets 2000 in the present invention.
Based on to being subjected to the research of factor affecting voltage fluctuation characteristics such as electric operation, electric network fault in the power supply process, rise temporarily at calculating voltage, boundary condition is as follows in the voltage dip process: approximate power taking presses average voltage before the fluctuation as sliding pressure reference value [being used to of IEC61000-4-30 (2003) definition described voltage dip/rise the temporarily term of reference voltage]; Voltage fluctuation can be ignored for the influence of mains frequency.Calculating shows, adopts the rectangular data window of 2000 sampled points of constant width to carry out the effective value analysis, and issuable error is 0.1%, satisfies the requirement of using fully.
The calculating of rolling of the time interval of neighbouring sample point, the voltage per unit value-time changing curve in the voltage fluctuation process of drawing, wherein:
Voltage per unit value=voltage rolls and calculates effective value/sliding pressure reference value
According to boundary condition, the sliding pressure reference value is the average voltage (steady state value) before the voltage fluctuation, can obtain thus that dynamic electric energy index of quality voltage rises temporarily, voltage dip and the characteristic value of interrupting in short-term: the minimum value of voltage per unit value is voltage dip amplitude (per unit value), if this voltage dip amplitude (per unit value) is less than 0.1p.u then be interruption in short-term; The maximum of voltage per unit value is a temporary increasing degree value (per unit value); The time difference that surpasses voltage dip or rise threshold value temporarily is duration (voltage dip/rise a temporarily threshold value, for judging the threshold value of voltage dip/liter generation temporarily, represent with per unit value, can also can be provided with) with reference to the recommendation of standards such as IEC according to the needs of research.
Voltage adaptable curve according to IEEE or electric company, electricity consumption enterprise is analyzed, and the voltage dip that capacitor switching produces, rises temporarily or interrupts index in short-term whether in the interval of voltage adaptable.
Two, the power supply buses voltage transient characteristic evaluating of capacitor switching generation.
The power supply buses voltage fluctuation that capacitor switching produces belongs to the transient voltage vibration, and its frequency of oscillation and amplitude analysis step are as follows:
Utilize the high sample frequency oscillograph record of 100kHz power supply buses voltage to be subjected to capacitor switching to cause the waveform of change in voltage.
The waveform of intercepting voltage fluctuation process, the frequency and the amplitude of the impulse hunting of employing FFT (Fourier transform) algorithm computation voltage transient.
Three, capacitor switching produces the influencing factor and the rule evaluation of power supply buses voltage fluctuation.
Capacitor switching comprises that to the influencing factor of power supply buses voltage fluctuation system short circuit capacity, switching angle, condenser capacity, load, string are anti-etc.
Utilize dynamic real-time digital simulator system (RTDS) to build the electric power system model, the power supply of system is connected through short-circuit impedance by Infinite bus system to be provided.Capacitor arrangements on the power supply buses is provided with according to the requirement of the guide rule of idle configuration.
Calculate the voltage fluctuation size that capacitor switching produces under the different capacities of short circuit.Simulation calculation result shows that capacity of short circuit is more little, the voltage dip that produces on the bus/rise big more temporarily.Vice versa.
Calculable capacitor carries out the voltage fluctuation size that switching produces under different switching angle situations.Simulation calculation result shows, and the maximum voltage in the capacitor input process rises temporarily/and range of decrease value can change along with the difference at switching angle temporarily, but the amplitude that changes is less than 5%.
Calculable capacitor carries out the voltage fluctuation size that switching produces when the descending configuration of guide rule prescribed limit inner capacities.Simulation calculation result shows that condenser capacity is big more, and the voltage dip that produces in the capacitor switching process/the increasing degree value is big more temporarily.
Calculable capacitor carries out the voltage fluctuation size that switching produces when series reactor is ascending in the guide rule prescribed limit.Simulation calculation result shows, and under difference was gone here and there anti-condition, voltage rose temporarily/and range of decrease value is basic identical with the Changing Pattern at switching angle temporarily; The voltage dip that produces in the capacitor switching process/the increasing degree value is also basic identical temporarily.
When calculating ascending variations of load on the power supply buses, the voltage fluctuation size of carrying out the switching generation.Simulation calculation result shows that when catering to capacitor under the identical situation of other conditions (system short circuit capacity, switching angle, condenser capacity, string resist), the busbar voltage of loading big more changes more little.
Four, for reducing and improve the dynamic electric voltage fluctuation that capacitor switching produces, the admissible measure of electric company.
According to the characteristic evaluating of capacitor switching for the influence of fluctuations of power supply buses dynamic electric voltage, electric company can take following measure to improve the dynamic electric voltage that power supply buses is subjected to capacitor switching to influence generation to fluctuate:
(1) because capacity of short circuit is more little, the voltage dip that produces on the bus/liter is big more temporarily, recommends the user priority of dynamic voltage quality sensitivity is selected the big power supply of capacity of short circuit.
(2) because condenser capacity is big more, the voltage dip that produces in the capacitor switching process/the increasing degree value is big more temporarily.Therefore, to user's power supply of dynamic voltage quality sensitivity, recommend the grouping of capacitor to do for a short time as far as possible; For the situation that a pool-size in transformer station's two group capacitors is big, a pool-size is little,, recommend to throw earlier and afterwards cut the little capacitor group of capacity by under the prerequisite of other feasibility studies.
(3) because when catering to capacitor under the identical situation of other conditions, the busbar voltage variation of load big more is more little.To user's power supply of dynamic voltage quality sensitivity, can reduce the dynamic electric voltage fluctuation in the capacitor switching process by increasing the load of power supply buses.Concrete load capacity can be carried out simulation calculation, also can be with reference to conclusion of the present invention.
Claims (3)
1, a kind of capacitor switching comprises power supply buses dynamic electric energy index of quality feature, voltage transient characteristic evaluating that capacitor switching produces to the characteristic evaluation method of dynamic electric voltage influence of fluctuations; Capacitor switching produces the influencing factor and the rule evaluation of power supply buses voltage fluctuation; It is characterized in that:
The power supply buses dynamic electric energy index of quality characteristic evaluating that described capacitor switching produces comprises the steps:
Based on equifrequent sampling, adopt 100kHz rolling data window, during the calculable capacitor switching, the dynamic electric energy index of quality voltage of power supply buses voltage rises temporarily, voltage dip and interrupting in short-term;
Voltage adaptable curve according to IEEE or electric company, electricity consumption enterprise is analyzed, and the voltage dip that capacitor switching produces, rises temporarily or interrupts index in short-term whether in the interval of voltage adaptable.
2, capacitor switching as claimed in claim 1 is characterized in that the characteristic evaluation method of dynamic electric voltage influence of fluctuations, and the power supply buses voltage transient characteristic evaluating that described capacitor switching produces comprises the steps:
Utilize the high sample frequency oscillograph record of 100kHz power supply buses voltage to be subjected to capacitor switching to cause the waveform of change in voltage;
The waveform of intercepting voltage fluctuation process adopts fft algorithm to calculate transient voltage impulse hunting frequency and amplitude.
3, capacitor switching as claimed in claim 1 is characterized in that the characteristic evaluation method of dynamic electric voltage influence of fluctuations, and influencing factor and rule evaluation that described capacitor switching produces the power supply buses voltage fluctuation comprise the steps:
Utilize the dynamic real-time digital simulator system to build the electric power system model, the power supply of system is connected through short-circuit impedance by Infinite bus system to be provided, and the capacitor arrangements on the power supply buses is provided with according to the requirement of idle configuration guide rule;
Calculate the voltage fluctuation size that capacitor switching produces under the different capacities of short circuit, capacity of short circuit is more little, and the voltage dip that produces on the bus/liter is big more temporarily, and capacity of short circuit is big more, the voltage dip that produces on the bus/rise more little temporarily;
Calculable capacitor carries out the voltage fluctuation size that switching produces under different switching angle situations, and the maximum voltage in the capacitor input process rises temporarily/and range of decrease value changes along with the difference at switching angle temporarily, but the amplitude that changes is less than 5%;
Calculable capacitor carries out the voltage fluctuation size that switching produces when the descending configuration of guide rule prescribed limit inner capacities, condenser capacity is big more, and the voltage dip that produces in the capacitor switching process/the increasing degree value is big more temporarily;
Calculable capacitor carries out the voltage fluctuation size that switching produces when series reactor is ascending in the guide rule prescribed limit, and under difference was gone here and there anti-condition, voltage rose temporarily/and range of decrease value is identical substantially with the Changing Pattern at switching angle temporarily; The voltage dip that produces in the capacitor switching process/the increasing degree value is also identical substantially temporarily.
When calculating ascending variations of load on the power supply buses, the voltage fluctuation size of carrying out the switching generation, when under other identical situations, catering to capacitor, the big more bus of loading, voltage fluctuation is more little.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007100941236A CN101399444A (en) | 2007-09-29 | 2007-09-29 | Characteristic evaluation method for influence of capacitor switching to dynamic voltage oscillation |
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| CNA2007100941236A CN101399444A (en) | 2007-09-29 | 2007-09-29 | Characteristic evaluation method for influence of capacitor switching to dynamic voltage oscillation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102955065A (en) * | 2012-11-06 | 2013-03-06 | 上海致维电气有限公司 | Oscilloscope and reactive power compensation system |
| CN104407198A (en) * | 2014-11-28 | 2015-03-11 | 深圳供电局有限公司 | Method and system for detecting SAG signal in DVR device |
| CN106786616A (en) * | 2017-03-25 | 2017-05-31 | 西安科技大学 | Power network shnt capacitor collocation method based on voltage dip evaluation index |
| CN106953321A (en) * | 2017-05-04 | 2017-07-14 | 广东电网有限责任公司电力科学研究院 | A kind of electric energy quality control method of power distribution station |
-
2007
- 2007-09-29 CN CNA2007100941236A patent/CN101399444A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102955065A (en) * | 2012-11-06 | 2013-03-06 | 上海致维电气有限公司 | Oscilloscope and reactive power compensation system |
| CN104407198A (en) * | 2014-11-28 | 2015-03-11 | 深圳供电局有限公司 | Method and system for detecting SAG signal in DVR device |
| CN106786616A (en) * | 2017-03-25 | 2017-05-31 | 西安科技大学 | Power network shnt capacitor collocation method based on voltage dip evaluation index |
| CN106786616B (en) * | 2017-03-25 | 2019-01-22 | 西安科技大学 | Power grid shunt capacitor configuration method based on voltage dip evaluation index |
| CN106953321A (en) * | 2017-05-04 | 2017-07-14 | 广东电网有限责任公司电力科学研究院 | A kind of electric energy quality control method of power distribution station |
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Open date: 20090401 |