CN105911321A - Electrical parameter transmission relationship-based T-type connection line electricity stealing identification for power distribution network - Google Patents
Electrical parameter transmission relationship-based T-type connection line electricity stealing identification for power distribution network Download PDFInfo
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- CN105911321A CN105911321A CN201610533152.7A CN201610533152A CN105911321A CN 105911321 A CN105911321 A CN 105911321A CN 201610533152 A CN201610533152 A CN 201610533152A CN 105911321 A CN105911321 A CN 105911321A
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- power
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
- G01R11/24—Arrangements for avoiding or indicating fraudulent use
Abstract
The invention belongs to the technical field of electricity stealing prevention of power distribution networks, and particularly relates to an electrical parameter transmission relationship-based T-type connection line electricity stealing identification for a power distribution network. The method comprises the following steps of: collecting operation information of nodes, with measurement capability, of a T-type connection line of the power distribution network; judging whether voltage effective values of the nodes are located in a voltage fluctuation range permitted by a power network or not; calculating the ratio of active power of the nodes and the product of the voltage effective values and a power factor; comparing the sum of calculated values of power injection nodes with the sum of the calculated values of power flow nodes; when the sums are consistent, judging normal operation of the T-type connection line; or else, judging appearance of electricity stealing; when the sums are kept consistent again, judging electricity stealing ending; and calculating public node power of the T-type connection line and voltage data. By the method, T-type connection line electricity stealing identification can be accurately finished in real time; the electricity stealing time is recorded; and meanwhile, the metering leakage caused by missing of metering points is complemented, so that new theoretical support and practice guidance are provided for a power supply company for fighting against line electricity stealing.
Description
Technical field
The invention belongs to power distribution network Prevention Stealing Electricity Technology field, particularly relate to a kind of distribution based on electric parameter transmission relation
Net T wiring stealing discrimination method.
Background technology
Electricity filching behavior refers to for the purpose of detinuing power consumption, underpay or not paying the electricity charge, artificial use hidden or its
His means make table measure or measure power consumption less, mainly include directly changing user side metering device and around more user side
Metering device stealing two kinds.Along with social economy's high speed development, power grid construction constantly raises speed, and stealing electricity phenomenon is as hindering management line
Damage reduction, the normal economical operation of harm Utilities Electric Co., hinder the power grid construction major reason with development, more and more public by electric power
Department and the concern of various circles of society.
T wiring refers to pick out the connections form that a circuit is powered to third party in supply line, wherein supplies
Electricity side is equivalent to undertake two users' power load, and the respective independent electricity consumption in electricity consumption side, the method for operation is not affected one another.At distribution
In net, T wiring is a kind of common connection type, is directly accessed supply line, line owing to actual T link mostly is new line
Road common node lacks metering device, and the T wiring continuous data that therefore electric company obtains mostly is stoichiometric number at line port
According to.
In T wiring, the existence of stealing electricity phenomenon not only changes electric network composition, causes power flow changing, more measures because of common node
The disappearance of device, causes electric company cannot obtain accurate power information, and serious infringement electric company economic interests, also to electric power
The safe operation of system causes great threat.Though existing power information acquisition system and the method for opposing electricity-stealing can pick out some stealings
Phenomenon, but certain limitation is still suffered from for T wiring stealing identification.Owing in T wiring, stealing is metering minority problem, steal
Electrical phenomena is hidden in the electrical operation parameter changed with operation of power networks, and existing stealing based on power information acquisition system
The many electrical operation parameters changed using power, voltage etc. of discrimination method are as the electric reference quantity in stealing criterion, it is difficult to find out
The electric parameter Changing Pattern that circuit stealing causes.Therefore, in the urgent need to a kind of novel stealing discrimination method, to reach accurately to distinguish
Know T wiring stealing, and the purpose of completion common node operation information.
Summary of the invention
For accurate recognition T link stealing, completion common node service data, the present invention proposes a kind of based on electrically
The power distribution network T wiring stealing discrimination method of parameter transmission relation, concrete steps include:
Step 1, collection power distribution network T wiring have each node running information of measurement capability；
Step 2, judge each node voltage virtual value whether be in electrical network allow scope range of the fluctuation of voltage in, if so, perform step
3, otherwise prompting voltage existing problems, suspend and judge；
Step 3, calculate each node active power and voltage effective value and the ratio of power factor product；
Step 4, compare T wiring power and inject the value of step 3 of node, flow out the sum of the value of the step 3 of node with power,
When both are consistent, it is determined that T wiring is properly functioning, perform step 5；When both are inconsistent, it is determined that occur in T wiring stealing
Electrical phenomena, and when both keep consistent again, it is determined that stealing terminates, and T connects wiring and recovers properly functioning；
Step 5, calculate T wiring common node power and voltage data according to power, voltage transmission gain；
Step 6, repetition step 1-step 5.
Described operation information obtains based on distribution network electric energy metering system.
Described operation information is voltage, power data, and wherein voltage data is voltage effective value, and power data is multiple merit
Rate, or active power and power factor.
Described operation information Data Source is in measuring value complete cycle of steady-state operation system.
Described power, voltage transmission gain resolve with form of ratios respectively and describe power, voltage transmission relation on branch road.
The beneficial effects of the present invention is: the electric parameter Changing Pattern caused by research circuit stealing, the most accurately
Complete the metering minority problem that T wiring stealing identification, recordable stealing time, and completion cause because of stoichiometric point disappearance, for supplying
Electricity company hits circuit stealing and provides new theories integration and practical advice.
Accompanying drawing explanation
Fig. 1 is simple branch road schematic diagram；
Fig. 2 is the impedance model that simple branch road is corresponding；
Simple branch road schematic diagram when Fig. 3 is to there is circuit stealing；
The impedance model that when Fig. 4 is to there is circuit stealing, simple branch road is corresponding；
Fig. 5 is the flow chart of power distribution network T wiring stealing discrimination method based on electric parameter transmission relation.
Detailed description of the invention
Below in conjunction with the accompanying drawings, embodiment is elaborated.
The theoretical basis of power distribution network T wiring stealing discrimination method based on electric parameter transmission relation is as follows:
One, branch road electric parameter transmission gain
Branch road electric parameter transmission gain refers to the ratio of the output of electric parameter and input quantity on branch road, in order to describe on branch road
The transitive relation of electric parameter.Owing to stealing the essential requirement that power is stealing, and voltage is the weight judging operation of power networks situation
Want parameter, therefore choose power, two kinds of electric parameters of voltage are analyzed.As a example by branch road simple shown in Fig. 1, i point is branch road
Power sends into point, injecting power, j point is sent a little for branch power, sends power, i, j point node voltage is respectively、.For easy analysis, transferred to circuit model and be analyzed, as shown in Figure 2.
First power transmission gain is calculated.According to rating formula shown in formula (1), power can be by the equivalence of its correspondence
Impedance obtains with the Current calculation flowing through branch road.For wall scroll branch road, owing on branch road, electric current is the most equal, each power ratio etc.
Ratio in the equiva lent impedance of its correspondence.For branch road shown in Fig. 1, power transmission gain is that j point sends power and i point injecting power
Ratio, expression formula is shown in formula (2).
(1)
(2)
Wherein,For branch current,For branch road i-j line impedance,For sending powerCorresponding equiva lent impedance.
According to j point voltageWith send power, corresponding equiva lent impedance can be obtainedFor
(3)
Next voltage transmission gain is calculated.For wall scroll branch road, due to branch road, to flow through electric current the most equal, and branch road exists public affairs
Formula (4), the ratio of branch road two ends node voltage is equal to the ratio of the equiva lent impedance of its correspondence, namely on branch road, voltage transmission gain is equal to
The ratio of the equiva lent impedance that node voltage is corresponding.For branch road shown in Fig. 1, voltage transmission gain is j point node voltage and i point node
The ratio of voltage, is represented by formula (5).
(4)
(5)
Two, each electric parameter transmission relation analysis in T wiring
As a example by shown in Fig. 3, T connects wiring schematic diagram, if branch road i-o, branch road o-j, branch road o-k common node are o point, due to public affairs
Conode lacks continuous data, and actual available continuous data is i point injecting power, i point voltage, j point send power
, j point voltage, k point load power, k point voltage。
If k point load impedance is, j point sends the equiva lent impedance of power and is, then branch road shown in Fig. 3 is corresponding circuit
Impedance model can be represented by Fig. 4, wherein、、It is respectively branch road i-o section, o-j section, o-k section line impedance,、
、It is respectively branch road i-o section, o-j section, o-k section electric current.According to galvanometer formula shown in formula (6), on each branch road, electric current can
The power, the voltage data that are obtained by the metering of i, j, k point calculate, as shown in formula (7)-(9).
(6)
(7)
(8)
(9)
2.1 power transmission relation
For circuit shown in Fig. 4, power transfer path is that two: one to be power inject from i point, via branch road i-o section, node o,
Branch road o-j section, is finally consumed in j point institute on-load；Two is that power injects from i point, via branch road i-o section, node o, branch road o-k
Section, is finally consumed in k point institute on-load.Derive according to power transmission gain on branch road, power on each section of branch road in transmission path
Transmission gain expression formula all can be written, and the voltage that on node o, injecting power is corresponding with sending power is identical, according to formula (1),
On node, the ratio of the equiva lent impedance conjugate that each power ratio is corresponding is inversely proportional to.
For branch road i-o, have
(10)
Wherein,Power is sent for branch road i-o,Equiva lent impedance for its correspondence.
For node o, have
(11)
(12)
(13)
Wherein,It is branch road o-j injecting power,Equiva lent impedance for its correspondence；It is branch road o-k injecting power,For
The equiva lent impedance of its correspondence.
For branch road o-j, have
(14)
For branch road o-k, have
(15)
Due to line impedance、、The circuit model can laid according to electric company and length computation,、Can pass through
Corresponding power calculates with voltage, thereforeAlso can obtain, see formula (16)-(18).According to derivation, T link is public
Node power data, i.e. o point injecting power, branch road o-j section injecting power, branch road o-k section injecting power, can lead to
Cross formula (10), (14), (15) are tried to achieve.
(16)
(17)
(18)
2.2 voltage transmission relation
T connects under wiring condition, and voltage does not transmit at common node or reallocates.If o point voltage is。
For branch road i-o, have
(19)
For branch road o-j, have
(20)
For branch road o-k, have
(21)
According to formula (19)-(21), the voltage data obtained by the metering of i, j, k point can be calculated T link common point
Voltage.
Three, T wiring stealing criterion based on electrical communications relation
For circuit shown in Fig. 4, by Kirchhoff's current law (KCL), formula (22) is set up.
(22)
Formula (22) is taken conjugation, obtains formula (23).
(23)
Formula (7)-(9) are substituted in formula (23), obtains formula (24).
(24)
When T link is properly functioning, power, the voltage data of metering device collection is calculated, the i point galvanometer obtained
Calculation value should be set up equal to j point and k point Current calculation value sum, formula (24)；When T link exists stealing, due to stealing
Person typically will not change magnitude of voltage, is the most easily found, and stealing power is the essential requirement that electricity filching person steals electric power, because of
Voltage data on this stealing place branch road is it is believed that relatively accurate, and power data is forbidden, and this branch current calculates inaccurate, formula
(24) it is false.
Thus obtain stealing criterion: for T wiring, gather and there is each node power of measurement capability, information of voltage, meter
Calculate the ratio of each node power and voltage, compare the power inflow calculated ratio of point and be calculated ratio with each power outflow point
Sum, if both are consistent, it is judged that this wiring is properly functioning；If both are inconsistent, it is judged that this wiring exists stealing electricity phenomenon, and when two
When person keeps consistent again, stealing terminates, and circuit recovers properly functioning.
In practical implementation, the power data that metering device collects is complex power, or active power and power because of
Number, and the voltage data collected is usually voltage effective value, scalar form, lacks phase angle information, the most above-mentioned stealing criterion
Can not directly apply, need to be modified.
As a example by single-phase sinusoidal ac, shown in active power calculating formula such as formula (25).
(25)
Wherein,For active power,For the voltage effective value of its correspondence,For the current effective value of its correspondence,For
The power factor of its correspondence.
Thus obtain galvanometer formula, as shown in formula (26).
(26)
For circuit shown in Fig. 4, o point inflow current should be equal to flowing out electric current, and formula (27) is set up.
(27)
Wherein,ForCorresponding active power,For its power factor,ForCorresponding voltage effective value；ForCorresponding active power,For its power factor,ForCorresponding voltage effective value；ForCorresponding is meritorious
Power,For its power factor,ForCorresponding voltage effective value.
Power distribution network many employings three phase sine alternating current of actual motion, shown in active power calculating formula such as formula (28).
(28)
Wherein,For active power,For the line voltage effective value of its correspondence,For the line current virtual value of its correspondence,Power factor for its correspondence.
Owing to Kirchhoff's current law (KCL) is applicable to three phase sine alternating current circuit, therefore for T link shown in Fig. 4, when
When power supply is equivalent to three-phase alternating-current supply, formula (27) is still set up.
Thus obtain new stealing criterion: for T wiring, gather and there is each node power of measurement capability, voltage letter
Breath, calculates active power and voltage effective value and the ratio of power factor product, compares power and flows into the calculated ratio of point
Flow out point with each power and be calculated ratio sum, if both keep consistent, it is judged that this wiring is properly functioning；If both differ
Causing, it is judged that this wiring exists stealing electricity phenomenon, and stealing terminates when both keep consistent again, circuit recovers properly functioning.
Four, T wiring common node Supplementing Data
When T link is properly functioning, owing to continuous data is accurate, each impedance data of circuit is it is known that T wiring common node merit
Rate data, i.e. node injecting power with send power, can by each branch power transmission gain calculate try to achieve, see formula (10),
(14), (15), and common-node voltage also can by voltage transmission gain calculate try to achieve, see formula (19)-(21), due to circuit
The most there is not stealing electricity phenomenon, voltage calculates and selects arbitrary formula all to can get correct common-node voltage.
In actual application, the information of voltage collected due to metering device is usually virtual value, scalar form, lacks phase angle
Information, and the voltage data that voltage transmission gain uses in calculating is vector data, it is therefore desirable to computing formula is carried out form
Conversion.Owing to voltage transmission gain analytic expression is form of ratios, phase angle size does not affect modulus value size, by voltage transmission gain solution
Analysis formula is converted into modulus value form, obtains new common-node voltage calculating formula, sees formula (29)-(31).
(29)
(30)
(31)
When T link is properly functioning, according to any metrology point voltage data and corresponding line impedance and load equiva lent impedance
Data, can try to achieve common-node voltage.
Five, T wiring stealing identification example
As a example by an actual T link, it is known that there is stealing on this circuit, circuit common node lacks metering, remaining node merit
Rate, voltage measurement device are intact, and line impedance parameter is known.The power data that metering device collects is complex power, voltage number
According to for voltage effective value.Staff scene is investigated, and finds that k point metering device is distorted, checks and verify through technological means, and k point measures
Device active power metering few metering 10kW compared with actual electricity consumption.
Actual track transfers to circuit model shown in Fig. 3, Fig. 4, and data represent with perunit value, reference capacity 10MVA, benchmark
Voltage 10kV, circuit each electric parameter variable is respectively with each branch impedance parameter
,,；
,,；
,,。
Try to achieve power factor corresponding to each power according to power data to be respectively
,,。
Derive according to T wiring stealing identification theory, try to achieve at each node active power and voltage effective value and power because of
The ratio of number product is as follows:
,,。
Result of calculation substituting into stealing criterion, finds that i point value of calculation is inconsistent with j, k point value of calculation sum, difference is
0.0078, it is determined that in T wiring, there is stealing.
Above theoretical derivation and example explanation, in the case of known to line parameter circuit value, T wiring stealing identification theory is derived
Can effectively realize real-time T link stealing identification, record the stealing time, and the metering minority that completion causes because of stoichiometric point disappearance is asked
Topic, hits circuit stealing for electric company and provides new theories integration and practical advice.
This embodiment is only the present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto,
Any those familiar with the art in the technical scope that the invention discloses, the change that can readily occur in or replacement,
All should contain within protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
It is as the criterion.
Claims (5)
1. a power distribution network T wiring stealing discrimination method based on electric parameter transmission relation, it is characterised in that mainly wrap
Include:
Step 1, collection power distribution network T wiring have each node running information of measurement capability；
Step 2, judge each node voltage virtual value whether be in electrical network allow scope range of the fluctuation of voltage in, if so, perform step
3, otherwise prompting voltage existing problems, suspend and judge；
Step 3, calculate each node active power and voltage effective value and the ratio of power factor product；
Step 4, compare T wiring power and inject the value of step 3 of node, flow out the sum of the value of the step 3 of node with power,
When both are consistent, it is determined that T wiring is properly functioning, perform step 5；When both are inconsistent, it is determined that occur in T wiring stealing
Electrical phenomena, and when both keep consistent again, it is determined that stealing terminates, and T connects wiring and recovers properly functioning；
Step 5, calculate T wiring common node power and voltage data according to power, voltage transmission gain；
Step 6, repetition step 1-step 5.
Method the most according to claim 1, it is characterised in that described operation information is to obtain based on distribution network electric energy metering system
?.
Method the most according to claim 1, it is characterised in that described operation information is voltage, power data, wherein voltage number
According to for voltage effective value, power data is complex power, or active power and power factor.
Method the most according to claim 1, it is characterised in that whole in steady-state operation system of described operation information Data Source
Periodic quantity measured value.
Method the most according to claim 1, it is characterised in that described power, voltage transmission gain are respectively with form of ratios solution
Analysis describes power, voltage transmission relation on branch road.
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| CN109142831A (en) * | 2018-09-21 | 2019-01-04 | 国网安徽省电力公司电力科学研究院 | A kind of resident's exception electricity consumption analysis method and device based on impedance analysis |
| CN111295592A (en) * | 2017-11-03 | 2020-06-16 | 3M创新有限公司 | System and method for anomaly detection in an electrical power network |
| CN112505403A (en) * | 2020-11-30 | 2021-03-16 | 国网山东省电力公司滨州供电公司 | Power distribution network metering protection system and method |
| CN112649642A (en) * | 2020-12-14 | 2021-04-13 | 广东电网有限责任公司广州供电局 | Electricity stealing position judging method, device, equipment and storage medium |
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Application publication date: 20160831 |