CN106646319B - Electronic type voltage transformer exception discrimination method based on combined measurement in standing - Google Patents

Electronic type voltage transformer exception discrimination method based on combined measurement in standing Download PDF

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Publication number
CN106646319B
CN106646319B CN201610880977.6A CN201610880977A CN106646319B CN 106646319 B CN106646319 B CN 106646319B CN 201610880977 A CN201610880977 A CN 201610880977A CN 106646319 B CN106646319 B CN 106646319B
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China
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electronic type
type voltage
voltage transformer
time window
average value
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CN106646319A (en
Inventor
杨世海
卢树峰
陈铭明
赵双双
周赣
李志新
陈刚
符旺
徐敏锐
陆子刚
吴桥
尧赣东
王少华
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State Grid Corp of China SGCC
Southeast University
Jiangsu Electric Power Research Institute
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State Grid Corp of China SGCC
Southeast University
Jiangsu Electric Power Research Institute
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00Testing or calibrating of apparatus covered by the preceding groups
    • G01R35/02Testing or calibrating of apparatus covered by the preceding groups of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating

Abstract

The invention discloses a kind of electronic type voltage transformer exception discrimination methods based on combined measurement in standing, the present invention is capable of the abnormality of accurate recognition electronic type voltage transformer under the premise of not adding any equipment, for the digital metering system secular error stability under complicated running environment, the support of reliability assessment providing method, the final development for promoting New Generation of Intelligent substation and the technological progress and popularization and application of digital metering system.

Description

Electronic type voltage transformer exception discrimination method based on combined measurement in standing
Technical field
The present invention relates to a kind of electronic type voltage transformer exception discrimination methods based on combined measurement in standing, and belong to number Change substation's technical field.
Background technique
Smart grid is the important directions of China's power network development, and intelligent substation is the important link of smart grid construction, It is the supporting point of the mostly important basic operation parameters collection point of power grid, control execution point and the following smart grid, development is built If directly influencing the aggregate level of China's smart grid construction.According to the unified strong smart grid of State Grid Corporation of China's construction It plans, China will build 110kV and the above intelligent substation 6100 during " 12th Five-Year Plan ".Digital metering system is intelligent change The important component in power station is made of electronic mutual inductor, combining unit and digitalized electrical energy meter, stability and reliable Sexual intercourse is to the fair and just of trade settlement.
As the pilot of more intelligent substations puts into operation, has a large amount of electronic type voltage transformers and obtained promoting and answer With.Electronic type voltage transformer is the key equipment of digital metering system, and conversion accuracy, stability are in entire metering system It plays a leading role in control errors.But due to using novel sensor and electronic component, however it remains following problem: electronic type Voltage transformer before installation and operation by all kinds of type approval tests, but electronic type voltage transformer under complex environment at the scene It is influenced vulnerable to extraneous factors such as electromagnetic environment, temperature and humidity, vibrations;Electronic type voltage transformer kinematic error is overproof under complex environment Or failure often occurs under the cross action of a variety of external interference sources, it can not be complete only by the method for single load interference source in short-term Face assessment electronics formula voltage transformer performance lacks electronic type voltage transformer theoretical modeling and test under a variety of typical interference sources Technical research.Further, since network message of the input of digital electricity meter based on IEC61850 agreement, such as network-impacting, electricity Source is waited extremely all can cause large effect to digital electricity meter.Therefore, digital metering system is generally deposited in intelligent substation The accuracy, stability the problems such as, the trade settlement of electric energy tariff point cannot be independently used for by leading to digital metering system still.Mesh Before, using the redundancy of traditional electric energy metering device and digital metering device two systems paired running in some intelligent substations Design scheme, to same stoichiometric point, matching measurement, this transition mode significantly increase cost of building a station to two systems each other, and not Meet the demand for development of intelligent substation.
In conclusion the technological progress of the development need digital metering system of New Generation of Intelligent substation, intelligent power transformation Stand firm the full on-line operation in Dingan County and digital metering system secular error Stability and dependability it is closely bound up.Digital meter Secular error stability, reliability and the raising for measuring confidence level of amount system, facilitate the water for promoting digital metering system It is flat, its digitlization, intellectualized technology advantage is given full play to, technical support is carried out for smart grid construction, there is huge economy Benefit and social benefit.It would therefore be highly desirable to solve the above problems.
Summary of the invention
In order to solve the above-mentioned technical problems, the present invention provides a kind of electronic type voltage mutual inductances based on combined measurement in standing Device exception discrimination method.
In order to achieve the above object, the technical scheme adopted by the invention is that:
Based on the electronic type voltage transformer exception discrimination method of combined measurement in standing, include the following steps,
Step 1, if two alternate being equipped with N number of electronic type voltage transformer altogether on the bus of some voltage class;
Step 2, the synchronous characteristic quantity for reading N number of electronic type voltage transformer output voltage;
Step 3, it is centainly calculating in time window, the characteristic quantity for calculating each electronic type voltage transformer output voltage is flat Mean value calculates the average value and variance of N number of characteristic quantity average value;
Step 4, N number of electronic type voltage transformer is compared in time scale, if the spy of some electronic type voltage transformer There is duration exception compared with remaining electronic type voltage transformer in sign amount, then it is assumed that the electronic type voltage transformer may go out It is now abnormal;Otherwise step 2 is returned to.
Electronic type voltage transformer output voltage is discrete value.
In step 2, the characteristic quantity of N number of electronic type voltage transformer output voltage includes virtual value UiAnd phaseWherein, I=1,2 ..., N, UiFor i-th of electronic type voltage transformer output voltage virtual value,For i-th of electronic type voltage transformer Output voltage phase.
In step 3, calculating has M total frequency periods in time window, is calculating in time window, i-th of electronic type voltage The average value of transformer output voltage virtual value isThe average value of i-th of electronic type voltage transformer output voltage phase isThe average value and variance of N number of virtual value average value is respectivelyAnd DU, the average value of N number of phase average It is respectively with variance
The detailed process of step 4 is,
The range for defining time scale is T, then exists in T timeA calculating time window;Wherein, M Indicate the total frequency period in time window;
In T time, each D calculated in time window is observedUWithIf some is calculated in time window,AndIt sets up, then in the calculating time window, by i-thεA electronic type voltage Mutual inductor is marked, wherein iε=max (Ui-XU) orMax is to be maximized function;
If being had more than in T time i-th in S calculating time windowεA electronic type voltage transformer is labeled, then it is assumed that I-thεThere is duration exception in a electronic type voltage transformer;
Advantageous effects of the invention: the present invention being capable of accurate recognition electronics under the premise of not adding any equipment The abnormality of formula voltage transformer, for digital metering system secular error stability, the reliability under complicated running environment Assess providing method support, the final development for promoting New Generation of Intelligent substation and the technological progress of digital metering system and It promotes and applies.
Detailed description of the invention
Fig. 1 is flow chart of the invention.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention Technical solution, and not intended to limit the protection scope of the present invention.
As shown in Figure 1, the electronic type voltage transformer exception discrimination method based on combined measurement in standing, including following step It is rapid:
Step 1, if two alternate being equipped with N number of electronic type voltage transformer altogether on the bus of some voltage class.
Here two-phase can be for AB be alternate, BC is alternate or AC is alternate, and electronic type voltage transformer output voltage is discrete Value, acceptable sampled point frequency range are fs=1kHz~4kHz.
Step 2, the synchronous characteristic quantity for reading N number of electronic type voltage transformer output voltage.
The characteristic quantity of N number of electronic type voltage transformer output voltage includes virtual value UiAnd phaseWherein, i=1, 2 ..., N, UiFor i-th of electronic type voltage transformer output voltage virtual value,It is exported for i-th of electronic type voltage transformer Voltage-phase.
Step 3, it is centainly calculating in time window, the characteristic quantity for calculating each electronic type voltage transformer output voltage is flat Mean value calculates the average value and variance of N number of characteristic quantity average value.
Calculating has M total frequency periods in time window, the value range of M is 50~100, and each calculating time window includes The sample size for having voltage dispersion value is Ns=fs/50×M;It is calculating in time window, i-th of electronic type voltage transformer is defeated The average value of voltage effective value is outThe average value of i-th of electronic type voltage transformer output voltage phase isIt is N number of The average value and variance of virtual value average value is respectivelyAnd DU, the average value and variance of N number of phase average Respectively
Step 4, N number of electronic type voltage transformer is compared in time scale, if the spy of some electronic type voltage transformer There is duration exception compared with remaining electronic type voltage transformer in sign amount, then it is assumed that the electronic type voltage transformer may go out It is now abnormal;Otherwise step 2 is returned to.
Detailed process is as follows:
The range for defining time scale is T, and unit is the second, then exists in T timeA calculating time window Mouthful;Wherein, M indicates the total frequency period in time window;
In T time, each D calculated in time window is observedUWithIf some is calculated in time window,AndIt sets up, then in the calculating time window, by i-thεA electronic type voltage Mutual inductor is marked, wherein iε=max (Ui-XU) orMax is to be maximized function;
If being had more than in T time i-th in S calculating time windowεA electronic type voltage transformer is labeled, then it is assumed that I-thεThere is duration exception in a electronic type voltage transformer;S is general, and value is
It lifts following example and further illustrates the above method:
4 electronic type voltage transformers are installed AB is alternate, the sample frequency of electronic type voltage transformer is 2kHz, when Between scale range be T=30min × 60=1800 seconds, there are 900 calculating time windows, S=450, such as table in 30min One and table two reflect the D in 30min respectivelyUWithThe two situation.
D in one 30min of tableUWithThe first situation
In Table 1,900 in 30min calculate the D in time windowUWithIt is all satisfiedThen determine each electronic type voltage transformer normal operation.
D in two 30min of tableUWithSecond situation
In table two, there are about the D in 200 calculating time windowsUWithMeet Separately there are 700 D calculated in time windowUWithMeet And what is be labeled in each window is i-thε=2 electronic type voltage transformers, then it is assumed that the electricity Minor voltage transformer is likely to occur exception.
The above method is capable of the abnormal shape of accurate recognition electronic type voltage transformer under the premise of not adding any equipment State supports, finally for digital metering system secular error stability, the reliability assessment providing method under complicated running environment Promote the development of New Generation of Intelligent substation and the technological progress and popularization and application of digital metering system.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations Also it should be regarded as protection scope of the present invention.

Claims (2)

1. the electronic type voltage transformer exception discrimination method based on combined measurement in standing, it is characterised in that: include the following steps,
Step 1, if two alternate being equipped with N number of electronic type voltage transformer altogether on the bus of some voltage class;
Step 2, the synchronous characteristic quantity for reading N number of electronic type voltage transformer output voltage;
Step 3, it is centainly calculating in time window, the characteristic quantity for calculating each electronic type voltage transformer output voltage is average Value, calculates the average value and variance of N number of characteristic quantity average value;
Step 4, N number of electronic type voltage transformer is compared in time scale, if the characteristic quantity of some electronic type voltage transformer Occurs duration exception compared with remaining electronic type voltage transformer, then it is assumed that the electronic type voltage transformer is likely to occur different Often;Otherwise step 2 is returned to;
In step 2, the characteristic quantity of N number of electronic type voltage transformer output voltage includes virtual value UiAnd phase
Wherein, i=1,2 ..., N, UiFor i-th of electronic type voltage transformer output voltage virtual value,For i-th of electronic type electricity Press transformer output voltage phase;
In step 3, calculating has M total frequency periods in time window, is calculating in time window, i-th of electronic type voltage mutual inductance The average value of device output voltage virtual value isThe average value of i-th of electronic type voltage transformer output voltage phase is The average value and variance of N number of virtual value average value is respectivelyAnd DU, the average value of N number of phase average and side Difference is respectivelyWith
The detailed process of step 4 is,
The range for defining time scale is T, then exists in T timeA calculating time window;Wherein, when M is indicated Between total frequency period in window;
In T time, each D calculated in time window is observedUWithIf some is calculated in time window,AndIt sets up, then in the calculating time window, by i-thεA electronic type voltage Mutual inductor is marked, wherein iε=max (Ui-XU) orMax is to be maximized function;
If being had more than in T time i-th in S calculating time windowεA electronic type voltage transformer is labeled, then it is assumed that i-thε There is duration exception in a electronic type voltage transformer;
2. the electronic type voltage transformer exception discrimination method according to claim 1 based on combined measurement in standing, special Sign is: electronic type voltage transformer output voltage is discrete value.
CN201610880977.6A 2016-10-09 2016-10-09 Electronic type voltage transformer exception discrimination method based on combined measurement in standing Active CN106646319B (en)

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Publication number Priority date Publication date Assignee Title
CN109116286A (en) * 2018-08-23 2019-01-01 国网福建省电力有限公司 A kind of measurement voltage mutual inductor on-line monitoring method
CN109284933A (en) * 2018-10-09 2019-01-29 国网江苏省电力有限公司电力科学研究院 A kind of electronic mutual inductor status assessing system and method based on mathematical statistics

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JP2009186266A (en) * 2008-02-05 2009-08-20 Jfe Steel Corp Fine ground fault detector
CN202948123U (en) * 2012-09-26 2013-05-22 湖北省电力公司电力科学研究院 On-site voltage transformer error active calibrating device
CN103454517A (en) * 2013-06-26 2013-12-18 广东电网公司佛山供电局 Method for online monitoring capacitive voltage transformers
JP5638729B1 (en) * 2014-03-12 2014-12-10 三菱電機株式会社 Anomaly diagnosis device for current transformer for Rogowski instrument
CN104316891A (en) * 2014-09-29 2015-01-28 许继电气股份有限公司 Electronic mutual inductor performance real-time monitoring system and method
CN104933012A (en) * 2015-05-08 2015-09-23 西南交通大学 Method for online identifying measurement deviation fault for traction substation instrument transformer
CN105785306A (en) * 2015-03-23 2016-07-20 国家电网公司 Voltage transformer on-line group calibration method and apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009186266A (en) * 2008-02-05 2009-08-20 Jfe Steel Corp Fine ground fault detector
CN202948123U (en) * 2012-09-26 2013-05-22 湖北省电力公司电力科学研究院 On-site voltage transformer error active calibrating device
CN103454517A (en) * 2013-06-26 2013-12-18 广东电网公司佛山供电局 Method for online monitoring capacitive voltage transformers
JP5638729B1 (en) * 2014-03-12 2014-12-10 三菱電機株式会社 Anomaly diagnosis device for current transformer for Rogowski instrument
CN104316891A (en) * 2014-09-29 2015-01-28 许继电气股份有限公司 Electronic mutual inductor performance real-time monitoring system and method
CN105785306A (en) * 2015-03-23 2016-07-20 国家电网公司 Voltage transformer on-line group calibration method and apparatus
CN104933012A (en) * 2015-05-08 2015-09-23 西南交通大学 Method for online identifying measurement deviation fault for traction substation instrument transformer

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