CN102479282A - Calculation method for voltage deviation in steady-state indicator of power quality - Google Patents
Calculation method for voltage deviation in steady-state indicator of power quality Download PDFInfo
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- CN102479282A CN102479282A CN2010105554890A CN201010555489A CN102479282A CN 102479282 A CN102479282 A CN 102479282A CN 2010105554890 A CN2010105554890 A CN 2010105554890A CN 201010555489 A CN201010555489 A CN 201010555489A CN 102479282 A CN102479282 A CN 102479282A
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- 238000004364 calculation method Methods 0.000 title claims abstract description 16
- 238000012544 monitoring process Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 5
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Abstract
The invention discloses a calculation method for voltage deviation in steady-state indicators of power quality. In the method, the voltage deviation in the steady-state indicators of the power quality is calculated with data in a database based on PQView. The method comprises the following steps: data reading: reading the data in the database based on the PQView; and calculation of the voltage deviation: if the rated voltage of a monitored point is linear voltage, the voltage deviation of Phase A and Phase B is used as the voltage deviation of Phase A, the voltage deviation of Phase B and Phase C is used as the voltage deviation of Phase B, and the voltage deviation of Phase C and Phase A is used as the voltage deviation of Phase C. The existing data in the database based on the PQView are utilized, original data are extracted from the database and are processed to obtain the voltage deviation in the steady-state indicators of the power quality during monitoring of the power quality, and the data can be used as scientific decision basis for governance of the power company over the power quality.
Description
Technical field
The present invention relates to quality of power supply field, relate in particular to a kind of computing method that are used for quality of power supply stable state index voltage deviation.
Background technology
Along with the application of exact instrument and complex electronic equipment, the user more and more requires the supply of electrical energy of high-quality and high reliability.In recent years, along with the introduction of external sophisticated equipment and the development of application and electron trade, by power quality problem cause increasing unusually.
The quality of power supply (Power Quality) is said from universal significance to be meant quality supply, comprises quality of voltage, electric current quality, power supply quality and uses electricity quality.It can be defined as: cause the deviation of voltage, electric current or the frequency of consumer fault or cisco unity malfunction, its content comprises frequency departure, voltage deviation, voltage fluctuation and flicker, three-phase imbalance, temporary transient or transient overvoltage, wave form distortion (harmonic wave), voltage dip, interruption, rises and power supply continuity etc. temporarily.
In recent years along with rapid development of economy; Electric load increases swift and violent; Increasingly sophisticatedization of power load and variation, increasing non-linear, impact, the application apparatus that uneven harmonic is abundant insert electrical network in succession, all can have influence on the quality of power supply of power supply grid to some extent.Monitoring means imperfection and operation, extraneous interference and various failure and other reasons in addition, power quality problem becomes increasingly conspicuous.
At present; The database that all is based on PQView that a lot of Utilities Electric Co.s electric energy quality monitoring system adopts; PQView is the power quality analysis software of U.S.'s DianKeYuan development; How the many electric energy quality monitoring data of storage carry out the calculating of voltage deviation in the quality of power supply stable state index to from this database, collecting data in this database, are that the present inventor is devoted to the problem studying and solve.
Summary of the invention
The objective of the invention is to overcome the defective of prior art and a kind of computing method that are used for quality of power supply stable state index voltage deviation are provided, these computing method can realize from being used for the calculating of quality of power supply stable state index voltage deviation based on collecting data the database of PQView.
The technical scheme that realizes above-mentioned purpose is: a kind of computing method that are used for quality of power supply stable state index voltage deviation; This method is with the calculating that is used for quality of power supply stable state index voltage deviation based on the data in the database of PQView; Wherein, may further comprise the steps:
The data read step is from based on reading of data the database of PQView;
The calculating voltage deviation if the rated voltage of monitoring point is a line voltage, is then got the voltage deviation of the voltage deviation of AB phase as the A phase, and the voltage deviation of BC phase is as the voltage deviation of B phase, and the voltage deviation of CA phase is as the voltage deviation of C phase.
The above-mentioned computing method that are used for quality of power supply stable state index voltage deviation, wherein, during the calculating voltage deviation, calculate as follows:
Step 1 is calculated the voltage deviation of the voltage data that each time point is uploaded in a day;
Step 2 is divided into two types of overgauge and minus deviation with the voltage deviation that calculates according to positive and negative;
Step 3 sorts overgauge and minus deviation respectively from big to small, takes out the big value of 95% probability and the little value of 95% probability in the minus deviation in the overgauge respectively, if overgauge is only arranged or minus deviation is only arranged, then only to overgauge or the minus deviation value that sorts;
Step 4 takes absolute value the overgauge that obtains 95% probable value and minus deviation 95% probable value respectively and addition, if overgauge or minus deviation are only arranged, then directly gets its 95% probable value;
Step 5, the absolute value sum that obtains is last voltage deviation calculated value.
The above-mentioned computing method that are used for quality of power supply stable state index voltage deviation; Wherein, During the calculating voltage deviation, get 95% probable value of each time point A within a day, B, C phase voltage deviation, in three values, get the voltage deviation value of maximal value afterwards again as this day.
The invention has the beneficial effects as follows: the present invention has utilized existing based on the data in the database of PQView; Through extracting raw data in this database; Raw data is obtained the needed voltage deviation that is used for quality of power supply stable state index in the electric energy quality monitoring after treatment, and these data are Utilities Electric Co. provides the scientific decision foundation to the improvement of the quality of power supply.
Embodiment
To combine embodiment that the present invention is described further below.
A kind of computing method that are used for quality of power supply stable state index voltage deviation of the present invention, this method are with the calculating that is used for quality of power supply stable state index voltage deviation based on the data in the database of PQView, may further comprise the steps:
The data read step is from based on reading of data the database of PQView;
The calculating voltage deviation; If the rated voltage of monitoring point is a line voltage, then get the voltage deviation of the voltage deviation of AB phase as the A phase, the voltage deviation of BC phase is as the voltage deviation of B phase; The voltage deviation of CA phase is as the voltage deviation of C phase, and the formula of voltage deviation is:
Wherein, δ U---voltage deviation;
U
Re---virtual voltage, kV;
U
N---nominal voltage of a system, kV.
During the calculating voltage deviation, the original calculation method is 95% probable value of getting each time point A within a day, B, C phase voltage deviation, in three values, gets the voltage deviation value of maximal value as this day afterwards again.
Perhaps adopt improved computing method, that is: during the calculating voltage deviation, calculate as follows:
Step 1 is calculated the voltage deviation of the voltage data that each time point is uploaded in a day
U wherein
iBe the magnitude of voltage of each time point of uploading, U
RefReference voltage for this monitoring point;
Step 2 is with the Δ U that calculates
iBe divided into two types of overgauge and minus deviation according to positive and negative;
Step 3 sorts overgauge and minus deviation respectively from big to small, takes out the big value of 95% probability and the little value of 95% probability in the minus deviation in the overgauge respectively, if overgauge is only arranged or minus deviation is only arranged, then only to overgauge or the minus deviation value that sorts, for example; The overgauge that obtains is 10%, 9%, 8%, 7%, 6%, 5%; 4%, 3%, 2%, 1%, the value of then taking out is 9%, because 10*5%=0.5; Be rounded to 1, then remove first big value, the minus deviation that obtains is-1% ,-2% ,-3%;-4% ,-5% ,-6% ,-7% ,-8%; The value of-9% ,-10% taking-up is-9%, because 10*5%=0.5 is rounded to 1, then removes last little value.
Step 4 takes absolute value the overgauge that obtains 95% probable value and minus deviation 95% probable value respectively and addition, if overgauge or minus deviation are only arranged; Then directly get its 95% probable value, for example for last example, then the absolute value sum is 18%; If overgauge or minus deviation are only arranged,, directly get its 95% probable value then without addition; For example have only overgauge or minus deviation, its 95% probable value is 9% or-9%, and then obtaining the absolute value sum is 9%;
Step 5, the absolute value sum that obtains is last voltage deviation calculated value.
More than combine embodiment that the present invention is specified, those skilled in the art can make the many variations example to the present invention according to above-mentioned explanation.Thereby some details among the embodiment should not constitute qualification of the present invention, and the scope that the present invention will define with appended claims is as protection scope of the present invention.
Claims (3)
1. computing method that are used for quality of power supply stable state index voltage deviation, this method is with the calculating that is used for quality of power supply stable state index voltage deviation based on the data in the database of PQView, it is characterized in that, may further comprise the steps:
The data read step is from based on reading of data the database of PQView;
The calculating voltage deviation if the rated voltage of monitoring point is a line voltage, is then got the voltage deviation of the voltage deviation of AB phase as the A phase, and the voltage deviation of BC phase is as the voltage deviation of B phase, and the voltage deviation of CA phase is as the voltage deviation of C phase.
2. the computing method that are used for quality of power supply stable state index voltage deviation according to claim 1 is characterized in that, during the calculating voltage deviation, calculate as follows:
Step 1 is calculated the voltage deviation of the voltage data that each time point is uploaded in a day;
Step 2 is divided into two types of overgauge and minus deviation with the voltage deviation that calculates according to positive and negative;
Step 3 sorts overgauge and minus deviation respectively from big to small, takes out the big value of 95% probability and the little value of 95% probability in the minus deviation in the overgauge respectively, if overgauge is only arranged or minus deviation is only arranged, then only to overgauge or the minus deviation value that sorts;
Step 4 takes absolute value the overgauge that obtains 95% probable value and minus deviation 95% probable value respectively and addition, if overgauge or minus deviation are only arranged, then directly gets its 95% probable value;
Step 5, the absolute value sum that obtains is last voltage deviation calculated value.
3. the computing method that are used for quality of power supply stable state index voltage deviation according to claim 1; It is characterized in that; During the calculating voltage deviation; Get 95% probable value of each time point A within a day, B, C phase voltage deviation, in three values, get the voltage deviation value of maximal value afterwards again as this day.
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| CN2010105554890A CN102479282A (en) | 2010-11-23 | 2010-11-23 | Calculation method for voltage deviation in steady-state indicator of power quality |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201440158U (en) * | 2009-07-21 | 2010-04-21 | 黑龙江大学 | Power quality monitoring and analyzing device |
| CN101707372A (en) * | 2009-11-13 | 2010-05-12 | 上海市电力公司 | Method for calculating and releasing rate of qualified power quality and voltage indexes |
-
2010
- 2010-11-23 CN CN2010105554890A patent/CN102479282A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201440158U (en) * | 2009-07-21 | 2010-04-21 | 黑龙江大学 | Power quality monitoring and analyzing device |
| CN101707372A (en) * | 2009-11-13 | 2010-05-12 | 上海市电力公司 | Method for calculating and releasing rate of qualified power quality and voltage indexes |
Non-Patent Citations (3)
| Title |
|---|
| 《大功率交流技术2009年》 20090320 李树军，石新春，付超 基于PQDIF的电能质量监测系统的设计 第50页，附图2 1-3 , 第2期 * |
| 李树军，石新春，付超: "基于PQDIF的电能质量监测系统的设计", 《大功率交流技术2009年》 * |
| 陶顺: "现代电力系统电能质量评估体系的研究", 《中国优秀博士论文全文数据库（工程科技Ⅱ辑）2009年》 * |
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