CN110137947A - Severity method temporarily drops in a kind of network voltage based on ITIC curve - Google Patents
Severity method temporarily drops in a kind of network voltage based on ITIC curve Download PDFInfo
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- CN110137947A CN110137947A CN201910390757.9A CN201910390757A CN110137947A CN 110137947 A CN110137947 A CN 110137947A CN 201910390757 A CN201910390757 A CN 201910390757A CN 110137947 A CN110137947 A CN 110137947A
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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
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Abstract
The invention discloses a kind of network voltages based on ITIC curve temporarily to drop Severity method, comprising the following steps: S1, obtains the related data that event temporarily drops in network voltage, pre-processes to data；S2, three classes are divided into according to voltage dip incident duration length；S3, the accounting for counting voltage dip event all voltage dip events in this area, obtain accounting obatained score according to accounting grade form；S4, the temporary drawdown degree of average voltage for counting voltage dip event judge the temporary drawdown degree obatained score of each regional average voltage；S5, it is weighted and averaged value to the temporary drawdown degree of average voltage of the institute's score and step S4 of the accounting of step S3, obtains the comprehensive score of the voltage dip severity in a certain area, the severity level of this area is obtained according to comprehensive score.It includes the limited defect of information content that the present invention, which had both avoided single evaluation index, it is also contemplated that influence of the different type voltage dip event to sensitive equipment.
Description
Technical field
The present invention relates to power quality analysis technical fields, more particularly, to a kind of power grid electricity based on ITIC curve
Severity method temporarily drops in pressure.
Background technique
With the development of the industries such as communication engineering technology, Computer Applied Technology, power electronic technique, sensitive load is in electricity
Accounting in Force system total load increases year by year, and Problem of Voltage Temporary-Drop is taken seriously further in many power quality problems.Electricity
Temporarily drop refers under the conditions of power frequency pressure, and certain point is restored just after there is of short duration lasting 10ms~1min low-voltage in electric system
The case where normal voltage, voltage root-mean-square valve is in during being somebody's turn to do according to the definition of International Electrical and Electronic Engineering Association (IEEE)
Within the scope of 0.1p.u~0.9p.u.When voltage dip occurs, motor is likely to occur shutdown, programmable logic controller (PLC) on production line
(PLC) may failure, computer storing data may lose etc., and this kind of transient power quality problems may be to personal safety
It poses a serious threat, serious loss is caused to national economy.It is investigated according to ASSOCIATE STATISTICS, is complained in all power qualities
In problem, ninety percent or more is as caused by voltage dip, and Problem of Voltage Temporary-Drop increasingly causes the concern on power supply circle.Important negative
Lotus point installs voltage dip monitoring device, collects the temporary drop data of network voltage, and temporarily drops severity to network voltage and carry out etc.
Grade assessment, there is particularly important meaning for the improvement of the operation of electric system, power quality.
Voltage dip from the immune degree of enhancing equipment voltage dip and can reduce as an inevitable natural phenomena
Equipment is started with solution or alleviation by voltage dip chance, this needs power department, user and equipment vendor tripartite to cooperate to solve.For
Negative effect of the voltage dip to user equipment is reduced, ITIC curve and SEMI F47 curve propose in succession, to instruct equipment system
It makes quotient and designs the electrical equipment for meeting voltage dip sensitive line, tolerance of the enhancing equipment to voltage dip.However in state
It is interior, it starts to walk just now for the research of voltage dip, is more from user perspective, mostly according to prison for Problem of Voltage Temporary-Drop
The features such as temporary decline, duration and the generation frequency of the voltage dip event measured are temporary with the voltage for measuring a certain monitoring point
Drop is influenced caused by user equipment.As system voltage mean effective value change rate index, the average temporarily drop number event of user refer to
The index that user's damage situations are measured in load perspective in this kind of station such as mark is more popular instantly, less from administration of power networks angle
It sets out, on the basis of comprehensively considering voltage dip event influences a certain area power grid power quality, proposition one reasonable
Judge mechanism provides the information and the grading of corresponding voltage dip severity of detailed district system voltage dip for user.
Therefore, it is necessary to voltage dip data are carried out in conjunction with big data analysis means to go deep into excavating line number modeling analysis of going forward side by side, it is right
The voltage dip event severity of area power grid make grade assessment, thus for user provide system voltage temporarily drop information with
Facilitate its factory site, equipment selection, also lays the foundation for power quality controlling work.
Summary of the invention
It is an object of the invention to provide a kind of voltage dip severity level division methods from administration of power networks angle, solution
Certainly voltage dip Severity inaccuracy, severity level divide unreasonable problem in the prior art.
The technical solution adopted by the present invention is as follows.
Severity method temporarily drops in a kind of network voltage based on ITIC curve, comprising the following steps:
S1, the related data that event temporarily drops in network voltage is obtained, data is pre-processed；
S2, three classes are divided into according to voltage dip incident duration length, are first kind voltage dip thing respectively
Part, the second class voltage dip event and third class voltage dip event；
S3, in conjunction with ITIC curve, statistics is located at the electricity of part under the lossless bad block of ITIC curve equipment, that is, voltage tolerance curve
The accounting of event all voltage dip events in this area temporarily drops in pressure, obtains accounting obatained score according to accounting grade form；
S4, the average voltage for counting all voltage dip events positioned at the lossless bad block of ITIC curve equipment in this area temporarily drop
Depth judges the temporary drawdown degree obatained score of each regional average voltage by the temporary drawdown degree grade form of average voltage；
S5, value is weighted and averaged to the temporary drawdown degree of average voltage of the institute's score and step S4 of the accounting of step S3, obtained
The comprehensive score for obtaining the voltage dip severity in a certain area, show that the corresponding voltage dip in this area is tight according to comprehensive score
Weight intensity grade, score is higher, represents that this area's voltage dip severity is lighter, and this area's Power quality management mode can not
Work changes；Score is lower, represents that this area's voltage dip degree is more serious, the attention for the person that should cause power system management,
The common inducement of voltage dip is found, Power quality management method is targetedly improved.
Further, data described in step S1 include time of origin, duration, temporary drawdown degree and the prison of voltage dip
Survey node.
Further, in the temporary drop data of city monitoring system registers in addition to normal data, there is also two kinds of improper feelings
The data of condition: first is that monitoring device failure causes the voltage dip duration of the node to be a certain fixed numbers；Second is that by
In scheduled outage, duration exceeds the monitoring device timing limit, also influenced while data record is wrong system voltage temporarily drop it is secondary
Several statistics, additionally due to the temporary drop waveform monitored changes greatly, monitoring system will be with primary temporarily drop as different temporarily drop things
Part, adequately analysis is as a result, the data of abnormal condition are rejected, so pretreatment described in step S1 includes such as
Under:
1) abnormal data caused by rejecting monitoring device and electric energy quality monitoring system work are not normal；
2) the voltage dip event for time of origin interval no more than 60s is judged to the only reservation one of repeated data；
3) the voltage dip event that the duration is more than 5000ms is rejected.
Further, the type criterion of the voltage dip event of step S2 is as follows:
0≤Tx<20 (1)
20≤Tx<500 (2)
500≤Tx<5000 (3)
Wherein, TxFor the duration extracted to event x, unit ms, x=1~n, n are all temporarily to drop event number；
According to ITIC curve, if meeting formula (1), which is first kind voltage dip event, wherein the
The voltage dip depth reference value V of a kind of voltage dip eventrefIt is 0%；If meeting formula (2), which is the
Two class voltage dip events, the voltage dip depth reference value V of the second class voltage dip eventrefIt is 70%；If meeting formula (3),
Then the voltage dip event is third class voltage dip event, the voltage dip depth reference value of third class voltage dip event
VrefIt is 80%.
Further, the statistical of step S3 is as follows:
Wherein, NjFor positioned at the number of the voltage dip event in j-th of area of the lossless bad block of ITIC curve equipment, MjFor
This area's voltage dip event total number, PjFor the lossless bad block voltage dip event of equipment in this area all voltage dip things
The accounting of part.
Further, the calculation of the accounting obatained score of step S3 is as follows:
G1=(1-Pj)×100
Wherein, G1For the lossless bad block voltage dip event accounting obatained score of this area's equipment, PjFor the lossless bad block electricity of equipment
The accounting of event all voltage dip events in this area temporarily drops in pressure.
For j-th of area, accounting obatained score is higher, represents the transient event for being located at the lossless bad block of ITIC curve equipment
It is smaller to account for all event accountings.
Further, the temporary drawdown degree grade form of the average voltage is obtained by expert analysis mode, the temporary drawdown of average voltage
Spending grade form is that the temporary drawdown degree of average voltage is divided into different score sections according to numerical values recited, and obatained score is higher, the ground
Average voltage temporary drawdown degree in area's is lower.
Further, the temporary drawdown degree of the average voltage of the step S4 is to count each voltage on the basis of ITIC curve
Voltage dip depth of the event with respect to ITIC curve is temporarily dropped, and each voltage dip depth counted on addition is averaged i.e.
For the temporary drawdown degree of average voltage of this area；
Specifically, voltage dip depth of the voltage dip event with respect to ITIC curve are as follows:
Vi=Vx-Vref
Wherein, VxFor voltage dip depth, that is, voltage of x-th of voltage dip event in the pretreated data of step S1
Temporarily drop feature amplitude, VrefFor the voltage dip depth reference value of voltage dip event x generic；
The temporary drawdown degree of the average voltage of this area is calculated using formula (3):
Wherein, L indicates that the temporary drawdown degree of this area's average voltage, N are this area's voltage dip total number of events amount, and n is the ground
Area's voltage dip event number, ViVoltage dip depth for i-th of voltage dip event with respect to ITIC curve.
For j-th of area, the numerical value of the temporary drawdown degree of average voltage determines the temporary drawdown degree of the average voltage of this area
Obatained score.Obatained score is higher, and average voltage temporary drawdown degree in this area's is lower.
Further, it is obtained by the lossless bad block voltage dip event accounting of the temporary drawdown degree of average voltage and equipment in area
Weighted average had not only fully considered the immune degree of equipment side voltage dip, but also had mentioned from net side information for power system management person
For electric energy method for quality control suggestion.
Further, severity is temporarily dropped to regional network voltage using the temporary drawdown degree of average voltage to assess, in conjunction with
ITIC curve judges the temporary drawdown degree of this area's voltage dip event, in expert analysis mode form as power system management person manager
Formula provides strong reference.
Further, it in conjunction with net side and equipment side information, fully takes into account sensitive load in power grid and network voltage is temporarily dropped
Immune degree, voltage dip event coverage caused by sensitive load in this area's is primarily determined on the basis of ITIC curve,
By expert analysis mode form from the voltage dip severity of user equipment angle estimator this area.
Further, pass through the lossless bad block voltage dip event accounting of the temporary drawdown degree of average voltage and equipment in above-mentioned area
Obatained score takes weighted average, obtains the comprehensive score of the voltage dip severity in a certain area, and obtains corresponding serious
Intensity grade；
The calculation formula of comprehensive score is as follows:
G=ω1·G1+ω2·G2 (4)
Wherein, G is the comprehensive score of this area's voltage dip severity, G1For the lossless bad block voltage dip event of equipment
Accounting obatained score, G2For the temporary drawdown degree obatained score of average voltage of this area, ω1And ω2It is tight respectively to calculate voltage dip
G in weight degree comprehensive score1And G2Weight.
As shown in table H, the score of comprehensive score is higher, and voltage dip severity level is lower, represents this area's voltage
Temporarily drop severity is lighter, its regional Power quality management mode that voltage dip severity is I and II can not be done
Change, the area that voltage dip severity is three-level need to be made on the basis of this area's Power quality management mode instantly
Adjustment；Score is lower, and voltage dip severity level is higher, and it is more serious to represent this area's voltage dip degree, corresponding electricity
Pressure temporarily drop severity be four, Pyatyi its regional power quality problem person that should cause power system management attention, find
The common inducement of voltage dip targetedly improves Power quality management method.
Table H voltage dip severity level divides
Compared with prior art, the beneficial effects of the present invention are:
(1) characteristic of the appraisal procedure bonding apparatus voltage tolerance curve, fully considers voltage dip multi-characteristicquantity quantity, packet
Include temporary drawdown degree, duration etc..
(2) it is directed to sensitive equipment, this area's voltage is measured by the out-of-limit degree of ITIC curve and average voltage dip depth
Temporarily drop severity, both having avoided single evaluation index includes the limited defect of information content, it is also contemplated that different type voltage dip
Influence of the event to sensitive equipment.
Detailed description of the invention
Fig. 1 is average Euclidean distance calculation flow chart；
Fig. 2 is each Operational Zone schematic diagram of ITIC curve；
Severity method flow diagram temporarily drops in network voltage of the Fig. 3 based on ITIC curve.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention into
Row is further described.
Severity method temporarily drops in a kind of network voltage based on ITIC curve as shown in figures 1 and 3, including with
Lower step:
S1, obtain network voltage and temporarily drop event related data, including but not limited to the time of origin of voltage dip, when continuing
Between, the information such as temporary drawdown degree, monitoring node, and Temporal Data is pre-processed.
In view of monitoring device, electric energy quality monitoring system work are not normal, rejecting abnormalities data in this embodiment, for
Voltage dip event of the time of origin interval no more than 60s is judged to the only reservation one of repeated data.Since voltage dip is only held
Continuous 10ms~1min, considers that monitoring instrument accuracy is certain, rejects the transient state that the duration is more than 5000ms in this embodiment
Data.
In the present embodiment, acquisition amounts to 1409 from 6, certain city regional 2017 year voltage dip data.Through
Cross abnormal data and the duration be more than 5000ms Temporal Data reject after, participate in network voltage Severity temporarily drops
Temporarily drop event number n=1231 item.Such as each department in table 1 corresponding total temporarily drop event number and out-of-limit temporary drop event number.
The event number table of 1 each department of table
S2, judge voltage dip event generic.
The step is based primarily upon ITIC curve, is divided into three classes according to voltage dip incident duration length, the
The voltage dip depth reference value of a kind of voltage dip event is 0%；The voltage dip depth of second class voltage dip event is joined
Examining value is 70%；The voltage dip depth reference value of third class voltage dip event is 80%.
Wherein, the type criterion of voltage dip event is as follows:
0≤Tx<20 (1)
20≤Tx<500 (2)
500≤Tx<5000 (3)
Wherein, TxFor the duration extracted to event x, x=1~n, n are all temporarily to drop event number, unit ms.Root
According to ITIC curve, if meeting formula (1), which is first kind voltage dip event, wherein first kind voltage is temporary
The voltage dip depth reference value V of drop eventrefIt is 0%；If meeting formula (2), which is that the second class voltage is temporary
Drop event, wherein the voltage dip depth reference value V of the second class voltage dip eventrefIt is 70%；It, should if meeting formula (3)
Voltage dip event is third class voltage dip event, wherein the voltage dip depth reference value of third class voltage dip event
VrefIt is 80%.
S3, in conjunction with ITIC curve, statistics is located at the lossless bad block of ITIC curve equipment (i.e. part under voltage tolerance curve)
Voltage dip event accounts for the ratio of all voltage dip events in this area.It is each by the judgement of voltage dip event accounting grade form
The affiliated grade of the lossless bad block voltage dip event accounting of the equipment in a area, each grade respectively correspond a score, institute's score
Number is higher, and the ratio that the voltage dip event that representative is located at the lossless bad block of ITIC curve equipment accounts for all voltage dip events is got over
It is small.
As shown in Fig. 2, the area that ITIC curve and duration reference axis are surrounded is the lossless bad block of ITIC curve equipment,
Part other than ITIC curve is normal working zone.For most equipment, set in the lossless bad block of ITIC curve equipment
Standby normal function will not ensure that performance, but is not to constitute equipment itself and damage.ITIC curve duration 20ms,
There is turnover at 500ms, the duration is located within the scope of 0~20ms, temporary drawdown degree reference value is 0%；Positioned at 20~
Within the scope of 500ms, temporary drawdown degree reference value is 70%, is located within the scope of 500~5000ms, temporary drawdown degree reference value is
80%.
Specifically, obtaining the lossless bad block voltage dip event accounting P of equipmentjIt is as follows:
Wherein, NjFor the voltage dip for being located at the lossless bad block of ITIC curve equipment in j-th of all temporary drop event in area
The number of event, MjFor j-th of regional voltage dip event total number, PjIt is the lossless bad block voltage dip event of equipment on the ground
The accounting of all voltage dip events in area.
It is as follows to calculate accounting obatained score:
G1=(1-Pj)×100
Wherein, G1For the lossless bad block voltage dip event accounting obatained score of equipment, PjFor the lossless bad block voltage dip of equipment
The accounting of event all voltage dip events in this area.
In the present embodiment, statistical result and corresponding scoring are as shown in the table:
2 accounting grade form of table
S4, all voltages positioned at the lossless bad block of ITIC curve equipment (i.e. part under voltage tolerance curve) in statistics this area
The temporarily temporary drawdown degree of average voltage of drop event judges the temporary drawdown of each regional average voltage by the temporary drawdown degree grade form of average voltage
Spend obatained score.
The opposite voltage dip depth of voltage dip event x are as follows:
Vi=Vx-Vref
Wherein, VxFor the voltage dip depth of voltage dip event x, x is 1~1231, VrefFor voltage dip event x institute
Belong to the voltage dip depth reference value of classification.
Described is the temporary drawdown degree of average voltage on the basis of ITIC curve, counts each voltage dip event with respect to ITIC song
The voltage dip depth of line, addition are averaged the temporary drawdown degree of average voltage that can obtain this area, and calculation formula is as follows:
Wherein, LjIndicate j-th of temporary drawdown degree of regional average voltage, N is this area's voltage dip total number of events amount, and n is
This area's voltage dip event number, ViVoltage dip depth for i-th of voltage dip event with respect to ITIC curve.
Shown in table 3, the temporary drawdown degree grade form of average voltage is to be obtained by expert analysis mode, according to expertise in table
The temporary drawdown degree of average voltage is divided into multiple and different scores according to numerical values recited.For j-th of area, average voltage is temporary
The numerical value of drawdown degree determines the temporary drawdown degree obatained score of the average voltage of this area.The temporary drawdown degree obatained score of average voltage is got over
Height, the temporary drawdown degree of this area's average voltage are lower.
The temporary drawdown degree grade form of 3 average voltage of table
In this embodiment, according to expertise, the temporary drawdown degree grade form of average voltage is as follows:
Depth calculation and appraisal result temporarily drop in 4 embodiment average voltage of table
S5, weighted average is taken to the temporary drawdown degree of average voltage of the institute's score and step S4 of the accounting of step S3, obtained
The comprehensive score of the voltage dip severity in a certain area, and obtain the corresponding severity level in this area, calculation formula
As shown in (4).
G=ω1·G1+ω2·G2 (4)
Wherein, G is the comprehensive score of this area's voltage dip severity, G1For the lossless bad block voltage dip event of equipment
Accounting obatained score, G2For the temporary drawdown degree obatained score of average voltage of this area, ω1And ω2It is tight respectively to calculate voltage dip
G in weight degree comprehensive score1And G2Weight.
As shown in table 5, comprehensive score is higher, and voltage dip severity level is lower, and it is tight to represent this area's voltage dip
Weight degree is lighter, can be right without modification for its regional Power quality management mode that voltage dip severity is I and II
It need to be adjusted on the basis of this area's Power quality management mode instantly in the area that voltage dip severity is three-level；It is flat
Equal voltage dip depth obatained score score is lower, and voltage dip severity level is higher, represents this area's voltage dip journey
Spend more serious, its regional power quality problem that severity is four, Pyatyi temporarily drops in corresponding voltage should cause electric system
The common inducement of voltage dip is found in the attention of manager, targetedly improves Power quality management method.
5 voltage dip severity level of table divides
In the present embodiment, ω is enabled1=ω2=0.5, then calculated result is as shown in table 6.
The comprehensive score table of 6 embodiment voltage dip severity of table
According to comprehensive score as a result, the superiority and inferiority of each area power quality is compared as follows:
3 >, 5 >, 2 >, 4 >, 1 > 6
Wherein, > be better than symbol, No. 3 regional power qualities are best, and No. 6 regional power qualities are worst.
For No. 3 areas, this area's electric energy quality grade is second level, the less voltage dip for leading to equipment fault
Event, can be constant to its Power quality management mode；For No. 5, No. 2, No. 4 areas, three regional electric energy quality grades are equal
For level Four, power quality is poor, is easy to happen the voltage dip event for leading to equipment fault, should be in voltage dip cause analysis base
This area's Power quality management mode instantly is targetedly adjusted on plinth；For No. 1 and No. 6 areas, two regional electric energy
Credit rating is Pyatyi, and power quality is very poor, easily leads to the voltage dip event of equipment fault, answers weight analysis electric
Occurrence cause temporarily drops in net, and changes this area's Power quality management mode instantly for common cause.
The foregoing is merely illustrative embodiments of the invention, the protection scope being not intended to limit the invention is all at this
Within the spirit and principle of invention, any modification, equivalent substitution, improvement and etc. done should be included in protection model of the invention
Within enclosing.
Claims (9)
1. Severity method temporarily drops in a kind of network voltage based on ITIC curve, which comprises the following steps:
S1, the related data that event temporarily drops in network voltage is obtained, data is pre-processed；
S2, three classes are divided into according to voltage dip incident duration length；
S3, in conjunction with ITIC curve, the voltage dip event that statistics is located at the lossless bad block of ITIC curve equipment owns in this area
The accounting of voltage dip event obtains accounting obatained score according to accounting grade form；
S4, the temporary drawdown of average voltage for counting all voltage dip events positioned at the lossless bad block of ITIC curve equipment in this area
Degree judges the temporary drawdown degree obatained score of each regional average voltage by the temporary drawdown degree grade form of average voltage；
S5, value is weighted and averaged to the temporary drawdown degree of average voltage of the institute's score and step S4 of the accounting of step S3, obtains certain
The comprehensive score of the voltage dip severity in one area, obtains the serious journey of the corresponding voltage dip in this area according to comprehensive score
Spend grade.
2. the comprehensive estimation method that severity temporarily drops in network voltage according to claim 1, which is characterized in that step S1
The data include time of origin, duration, temporary drawdown degree and the monitoring node of voltage dip.
3. Severity method temporarily drops in network voltage according to claim 1, which is characterized in that described in step S1
Pretreatment includes the following:
1) abnormal data caused by rejecting monitoring device and electric energy quality monitoring system work are not normal；
2) the voltage dip event for time of origin interval no more than 60s is judged to the only reservation one of repeated data；
3) the voltage dip event that the duration is more than 5000ms is rejected.
4. Severity method temporarily drops in network voltage according to claim 1, which is characterized in that the voltage of step S2
Temporarily the type criterion of drop event is as follows:
0≤Tx<20 (1)
20≤Tx<500 (2)
500≤Tx<5000 (3)
Wherein, TxFor the duration extracted to event x, unit ms, x=1~n, n are all temporarily to drop event number；
According to ITIC curve, if meeting formula (1), which is first kind voltage dip event, wherein the first kind
The voltage dip depth reference value V of voltage dip eventrefIt is 0%；If meeting formula (2), which is the second class
Voltage dip event, the voltage dip depth reference value V of the second class voltage dip eventrefIt is 70%；It, should if meeting formula (3)
Voltage dip event is third class voltage dip event, the voltage dip depth reference value V of third class voltage dip eventrefFor
80%.
5. Severity method temporarily drops in network voltage according to claim 1, which is characterized in that the statistics of step S3
Mode is as follows:
Wherein, NjFor positioned at the number of the voltage dip event in j-th of area of the lossless bad block of ITIC curve equipment, MjFor the ground
Area's voltage dip event total number, PjFor the lossless bad block voltage dip event of equipment in this area all voltage dip events
Accounting.
6. Severity method temporarily drops in network voltage according to claim 1, which is characterized in that the accounting of step S3
The calculation of obatained score is as follows:
G1=(1-Pj)×100
Wherein, G1For the lossless bad block voltage dip event accounting obatained score of this area's equipment, PjIt is temporary for the lossless bad block voltage of equipment
The accounting of drop event all voltage dip events in this area.
7. Severity method temporarily drops in network voltage according to claim 1, which is characterized in that the average voltage
Temporary drawdown degree grade form is obtained by expert analysis mode, the temporary drawdown degree grade form of average voltage be by the temporary drawdown degree of average voltage by
Different score sections is divided into according to numerical values recited, obatained score is higher, and average voltage temporary drawdown degree in this area's is lower.
8. Severity method temporarily drops in network voltage according to claim 1, which is characterized in that the step S4's
The temporary drawdown degree of average voltage is to count voltage dip of each voltage dip event with respect to ITIC curve on the basis of ITIC curve
Depth, and each voltage dip depth counted on is added to the temporary drawdown degree of average voltage being averaged as this area；
Specifically, the voltage dip depth V to a certain voltage dip event with respect to ITIC curveiAre as follows:
Vi=Vx-Vref
Wherein, VxIt is special for voltage dip depth, that is, voltage dip of x-th of voltage dip event in the pretreated data of step S1
Levy amplitude, VrefFor the voltage dip depth reference value of voltage dip event x generic；
The temporary drawdown degree of the average voltage of all voltage dip events positioned at the lossless bad block of ITIC curve equipment in this area is using public
Formula (3) calculates:
Wherein, L indicates that the temporary drawdown degree of this area's average voltage, N are this area's voltage dip total number of events amount, and n is this area's electricity
Event number, V temporarily drop in pressureiVoltage dip depth for i-th of voltage dip event with respect to ITIC curve.
9. Severity method temporarily drops in network voltage according to claim 1, which is characterized in that step S5's is a certain
The comprehensive score of the voltage dip severity in area calculates as follows:
G=ω1·G1+ω2·G2 (4)
Wherein, G is the comprehensive score of this area's voltage dip severity, G1For the lossless bad block voltage dip event accounting of equipment
Obatained score, G2For the temporary drawdown degree obatained score of average voltage of this area, ω1And ω2Respectively calculate the serious journey of voltage dip
Spend G in comprehensive score1And G2Weight.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112285410A (en) * | 2020-09-29 | 2021-01-29 | 国网宁夏电力有限公司中卫供电公司 | Method, medium and system for estimating severity of voltage sag |
| CN112881824A (en) * | 2021-01-08 | 2021-06-01 | 国网安徽省电力有限公司电力科学研究院 | Method and device for evaluating influence of voltage sag of medium-voltage system on computer equipment |
| CN113656237A (en) * | 2021-07-16 | 2021-11-16 | 华南理工大学 | Load voltage sag immunity rating method, system, device and medium |
| CN113675842A (en) * | 2021-07-27 | 2021-11-19 | 华南理工大学 | Voltage sag compatibility evaluation method, system, device and medium |
| CN114047376A (en) * | 2021-09-27 | 2022-02-15 | 宁波三星智能电气有限公司 | Voltage sag event detection method for double-core electric energy meter |
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