CN105184658A - Power distribution network anti-electricity-theft method based on electrical parameter transmission gain matching relationship - Google Patents

Abstract

The invention belongs to the technical field of power distribution network anti-electricity-theft, and especially relates to a power distribution network anti-electricity-theft method based on the electrical parameter transmission gain matching relationship. The method comprises the steps as follows: acquiring the operation information of each node of a power distribution network; judging whether the node voltage is within an effective range; calculating the voltage transmission gain of the nodes at the two ends of each branch and the power transmission gain of each branch; comparing the power transmission gain and the voltage transmission gain of each branch, judging that there is no user electricity theft when the power transmission gain and the voltage transmission gain are consistent, judging that there is user electricity theft when the power transmission gain and the voltage transmission gain are inconsistent, and judging that user electricity theft ends when the power transmission gain and the voltage transmission gain are consistent again; and locating the electricity theft position according to the branch where the judgment criterion works. According to the method, the electricity theft judgment criterion and location are integrated, electricity theft is made 'transparent', an edge tool for review is provided for the anti-electricity-theft department, and accurate data support is provided for the power grid to recoup the loss.

Description

Power distribution network based on electric parameter transmission gain matching relationship is opposed electricity-stealing method

Technical field

The invention belongs to power distribution network Prevention Stealing Electricity Technology field, particularly relate to a kind of power distribution network based on electric parameter transmission gain matching relationship and to oppose electricity-stealing method.

Background technology

Electricity filching behavior refers to and occupies power consumption to illegally, underpays or do not pay for the purpose of the electricity charge, artificially adopts hidden or other means table is measured or measures power consumption less.Stealing form is varied, and common stealing electricity method can be divided into the stealing relevant with measuring apparatus and the large class of the stealing two irrelevant with measuring apparatus.Wherein relevant with measuring apparatus stealing mainly comprises under-voltage method stealing, the stealing of undercurrent method, phase-shifting method stealing, expands the stealing of difference method, adopts electrical burglary stealing and electronic watch and centralized meter-reading system stealing etc.; And the stealing irrelevant with measuring apparatus comprises and increases power consumption equipment capacity stealing and inner hook ties stealing etc. outward around more measuring apparatus stealing, privately.In recent years, along with the development of science and technology, stealing gimmick gets more and more, also more and more hidden, there is a series of hi-tech stealing electricity method especially, as stealing gimmicks such as dummy load stealing, radio-frequency module remote control stealing, the program control stealing of microelectronics, harmonic wave stealing and 485 communication stealings.

For components and parts stealing, traditional measure of opposing electricity-stealing mainly comprises: the seal improving counter box, metering cabinet, table tail; Transformer low voltage sleeve pipe installs anti-electricity-theft cap additional; Adopt thief-proof electricity meter box; Strengthen the front wire management of table, close transformer low voltage outlet and table front; For preventing client from falling to show, adopt twocouese register, inverse-stopping type electric energy meter or electronic electric energy meter; Private is drawn and disorderly hangs the serious area of phenomenon, low-voltage circuit is replaced by insulated conductor or cable; Promote TA (current transformer) sleeve pipe to substation transformer, prevention client utilizes TA (current transformer) stealing; Metering TV (voltage transformer (VT)) loop configuration voltage drop recorder etc.Along with hiddenization of electricity filching behavior, mode of opposing electricity-stealing also is opposed electricity-stealing for components and parts by traditional, develops into gradually and utilizes power information acquisition system to oppose electricity-stealing.The universal development facilitating Prevention Stealing Electricity Technology of power information acquisition system, the stealing discrimination method based on user power utilization information Real-Time Monitoring proposed in some documents obtains popularization.By comparing power information and historical data in real time, or the comprehensive situation of change analyzing electric parameters in network, find out the suspicious user of stealing.

Although the existing method of opposing electricity-stealing can pick out some stealing electricity phenomenons, still have some limitations: the Prevention Stealing Electricity Technology great majority for components and parts see that trick tears trick open, not there is general applicability and network is of overall importance; And choose voltage, electric current or power as the electric reference quantity in stealing criterion based on the stealing discrimination method great majority of user power utilization information Real-Time Monitoring, these electric parameters are moment change with operation of power networks, if stealing electricity phenomenon is implied in wherein, just be difficult to the Changing Pattern finding out the electric parameter caused because of stealing, lack the theoretical foundation of identification stealing electricity phenomenon.For ensureing economy and the security of electric system, in the urgent need to setting up a kind of novel, accurate, feasible stealing discrimination method.

Summary of the invention

In order to adapt to the demand of power system economy and security, provide a kind of novel, accurate, feasible stealing discrimination method, the present invention proposes a kind of power distribution network based on electric parameter transmission gain matching relationship and to oppose electricity-stealing method, concrete steps comprise:

The operation information of step 1, each node of collection power distribution network;

Step 2, judge whether certain node voltage is in effective range, if so, then perform step 3, if not, then account for voltage data are wrong, stop stealing differentiating;

Step 3, the calculating transmission gain of a branch road two ends node voltage signal and the transmission gain of this branch power amount;

Step 4, the more above-mentioned power delivery gain that calculates and voltage transmission gain, when both are consistent, then judge no user electricity filching behavior, when both are inconsistent, then judge user electricity filching behavior occurs, when both from inconsistent be consistent again time, then judge that user's electricity filching behavior terminates;

Step 5, repetition step 1 ~ step 4; And bypass position corresponding when working according to criterion locates electricity filching behavior nidus.

Described operation information utilizes the power information acquisition system of distribution automation system to obtain.

Described operation information comprises: voltage effective value, load complex power or active power and power factor.

Described operation information derives from measuring value complete cycle of steady-state operation system.

Described transmission gain adopts form of ratios to describe voltage, power relation under same dimension respectively.

Described method is also recorded and is judged the generation of user electricity filching behavior and the moment of end and position thereof, checks electricity filching behavior further produce evidence for the department of opposing electricity-stealing.

Beneficial effect of the present invention is: stealing criterion and location are combined together, effective discovery carries out the behavior of stealing by change electric current and power, by stealing electricity phenomenon " transparence ", for the department of opposing electricity-stealing provides examination & verification sharp weapon, retrieve a loss for electrical network and Data support is accurately provided.

Accompanying drawing explanation

Fig. 1 is simple branch power transmission schematic diagram;

Fig. 2 is simple branch power transmission block scheme;

Fig. 3 is node power transmission schematic diagram;

Fig. 4 is node power transmission block scheme;

Fig. 5 is the process flow diagram of method of opposing electricity-stealing based on the power distribution network of electric parameter transmission gain matching relationship.

Embodiment

Below in conjunction with accompanying drawing, embodiment is elaborated.

The oppose electricity-stealing theoretical foundation of method of power distribution network based on electric parameter transmission gain matching relationship is as follows:

One, power delivery gain is derived

The target that branch power transmission describes, be exactly to the analytic expression of out branch injecting power with the ratio of branch road output power, be called power delivery gain, after its meaning is that branch road loss is linearly represented by branch road output power, branch road is sent power and is equaled injecting power and transmission gain is long-pending, forms the conveying relation of branch power thus.

1.1 branch power transmission gains

In Fig. 1, i, j are node ID; for the injecting power of node i; for load power or the power from node j output.

In simple power system shown in Fig. 1, branch road loss power and over the ground consumed power can regard the power consumption of two series impedances as, and branch road loss power, by consumed power linear expression over the ground, becomes the key asking for power delivery gain.

If: the impedance of branch road i-j is z _ij, for branch road loss power

According to power-balance character, have

${\stackrel{\·}{S}}_i={\stackrel{\·}{S}}_{ij}+{\stackrel{\·}{S}}_j---\left(1\right)$

When node voltage is known, corresponding impedance is

$z_j=\frac{{\stackrel{\·}{U}}_j{\stackrel{\·}{U}}_j^{*}}{{\stackrel{\·}{S}}_j^{*}}---\left(2\right)$

Then by the transmission of electricity model of above-mentioned electric system, z can be converted to _ijand z _jthe series model of two impedances.

The analytical expression of each electric parameter can be provided according to this circuit model.

If: the electric current in circuit is

Impedance z _ijconsumed power be

${\stackrel{\·}{S}}_{ij}={\stackrel{\·}{U}}_{ij}{\stackrel{\·}{I}}_{ij}^{*}=z_{ij}{\stackrel{\·}{I}}_{ij}{\stackrel{\·}{I}}_{ij}^{*}---\left(3\right)$

Impedance z _jconsumed power be

${\stackrel{\·}{S}}_j={\stackrel{\·}{U}}_j{\stackrel{\·}{I}}_{ij}^{*}=z_j{\stackrel{\·}{I}}_{ij}{\stackrel{\·}{I}}_{ij}^{*}---\left(4\right)$

The ratio of two formulas is

$\frac{{\stackrel{\·}{S}}_{ij}}{{\stackrel{\·}{S}}_j}=\frac{z_{ij}}{z_j}---\left(5\right)$

That is, ${\stackrel{\·}{S}}_{ij}=\frac{z_{ij}}{z_j}\·{\stackrel{\·}{S}}_j---\left(6\right)$

Now, branch road loss power is converted to the function sending power.This relation is substituted into (1) formula, has

${\stackrel{\·}{S}}_i={\stackrel{\·}{S}}_{ij}+{\stackrel{\·}{S}}_j=(1+\frac{z_{ij}}{z_j}){\stackrel{\·}{S}}_j---\left(7\right)$

Consider the transitive relation of power, representing branch road injecting power, is source, and for sending power, above formula is converted into

${\stackrel{\·}{S}}_j=\frac{1}{(1+\frac{z_{ij}}{z_j})}{\stackrel{\·}{S}}_i---\left(8\right)$

Use for reference the block scheme thought of control theory, above formula can be represented by Fig. 2.

In Fig. 2, backfeed loop represents branch impedance loss.

Branch power transmission gain is

$\frac{{\stackrel{\·}{S}}_j}{{\stackrel{\·}{S}}_i}=\frac{1}{(1+\frac{z_{ij}}{z_j})}---\left(9\right)$

The power delivery gain of 1.2 nodes

In electric system shown in Fig. 3, the power consumption that two parallel impedances can be regarded as of two branch roads over the ground, wherein one over the ground branch road be load branch circuit, another is describe the equivalent branch road that transmission of electricity path formed.

In Fig. 3, node is i, j, k; for being injected the injecting power of node j by branch road i-j; for load branch circuit consumed power; for the injecting power of branch road j-k.

Power delivery gain describes with between funtcional relationship.

The power being injected into node j by branch road i-j is node j load branch circuit consumed power and branch road j-k injecting power sum over the ground,

${\stackrel{\·}{S}}_{Tij}={\stackrel{\·}{S}}_j+{\stackrel{\·}{S}}_{\mathrm{\Σ}jk}---\left(10\right)$

As shown in Figure 4, z is used _jdescription node j is branch impedance over the ground, z _{∑ jk}describe the equivalent impedance of branch road j-k injection port, the complex power that two branch roads are corresponding is

${\stackrel{\·}{S}}_j=\frac{{\stackrel{\·}{U}}_j{\stackrel{\·}{U}}_j^{*}}{z_j^{*}}---\left(11\right)$

${\stackrel{\·}{S}}_{\mathrm{\Σ}jk}=\frac{{\stackrel{\·}{U}}_j{\stackrel{\·}{U}}_j^{*}}{z_{\mathrm{\Σ}jk}^{*}}---\left(12\right)$

The ratio of two formulas is, $\frac{{\stackrel{\·}{S}}_j}{{\stackrel{\·}{S}}_{\mathrm{\Σ}jk}}=\frac{z_{\mathrm{\Σ}jk}^{*}}{z_j^{*}}---\left(13\right)$

Load power is expressed as by output power

${\stackrel{\·}{S}}_j=\frac{z_{\mathrm{\Σ}jk}^{*}}{z_j^{*}}{\stackrel{\·}{S}}_{\mathrm{\Σ}jk}---\left(14\right)$

Being linearly described as between total injecting power and output power

${\stackrel{\·}{S}}_{Tij}=(1+\frac{z_{\mathrm{\Σ}jk}^{*}}{z_j^{*}}){\stackrel{\·}{S}}_{\mathrm{\Σ}jk}---\left(15\right)$

Branch road j-k injecting power (output power) with the power delivery gain of total injecting power (power input) is

$\frac{{\stackrel{\·}{S}}_{\mathrm{\Σ}jk}}{{\stackrel{\·}{S}}_{Tij}}=\frac{1}{1+\frac{z_{\mathrm{\Σ}jk}^{*}}{z_j^{*}}}---\left(16\right)$

Two, on branch road, voltage transmission gain is derived

According to hypothesis above, for z _ijand z _jthe series circuit model of two impedances, describes voltage transmittance process.

Impedance z _ijon voltage be

${\stackrel{\·}{U}}_{ij}=z_{ij}{\stackrel{\·}{I}}_{ij}---\left(17\right)$

Impedance z _jon voltage be

${\stackrel{\·}{U}}_j=z_j{\stackrel{\·}{I}}_{ij}---\left(18\right)$

The ratio of two formulas

$\frac{{\stackrel{\·}{U}}_{ij}}{{\stackrel{\·}{U}}_j}=\frac{z_{ij}}{z_j}---\left(19\right)$

According to Kirchhoff's second law,

${\stackrel{\·}{U}}_i={\stackrel{\·}{U}}_{ij}+{\stackrel{\·}{U}}_j=(1+\frac{z_{ij}}{z_j}){\stackrel{\·}{U}}_j---\left(20\right)$

The branch road transmission gain of voltage is

$\frac{{\stackrel{\·}{U}}_j}{{\stackrel{\·}{U}}_i}=\frac{1}{1+\frac{z_{ij}}{z_j}}---\left(21\right)$

(9) formula of observation and (21) formula, can find out, the result of two formulas is the same.Illustrate that, for this simple branch model, its power delivery gain is identical with voltage transmission gain.

Three, based on the conforming stealing criterion of transmission gain

When trend exists, carry out transmission gain analysis respectively to power in electrical network and voltage parameter, find that the Analytical Expression of both gains on branch road is the same, such as formula (9) and (21), the impedance ratio in two formulas is the same.

For electricity filching person, the object of minimizing table meter metering numerical value is reached by the input voltage value changing electric energy measurement instrument, be very easy to be found by aufsichtsrat, some intelligent meters find that voltage is lower than threshold value meeting automatic alarm, electricity filching behavior concentrates on the object reaching minimizing table meter metering numerical value by changing electric current for this reason, current value constantly changes, electricity filching behavior cover by the change of power load, be not easy to be found.

When there being electricity filching behavior to occur, the just electric energy meter that user changes counts, and real electricity consumption is also in generation, and voltage value is real, magnitude of power by people for have modified, therefore emergent power transmission gain and the inconsistent phenomenon of voltage transmission gain; At the end of stealing, both are consistent again.

So the stealing criterion that the application proposes is: the phenomenon that emergent power transmission gain and voltage transmission gain are inconsistent, and at the end of working as stealing, both are consistent again.

This combination stealing method of discrimination according to parameter transmission gain is original creation.It can differentiate electricity filching behavior, can locate again, is a complete method.

The power distribution network method of opposing electricity-stealing based on electric parameter transmission gain combinations matches that can propose the application according to theoretical analysis above specifically comprises the following steps, as shown in Figure 5:

The operation information of step 1, each node of collection power distribution network;

Step 2, judge whether certain node voltage is in effective range, if so, then perform step 3, if not, then account for voltage data are wrong, stop stealing differentiating;

Step 3, the calculating transmission gain of a branch road two ends node voltage signal and the transmission gain of this branch power amount;

Step 4, the more above-mentioned power delivery gain that calculates and voltage transmission gain, when both are consistent, then judge no user electricity filching behavior, when both are inconsistent, then judge user electricity filching behavior occurs, when both from inconsistent be consistent again time, then judge that user's electricity filching behavior terminates;

Step 5, repetition step 1 ~ step 4; And bypass position corresponding when working according to criterion locates electricity filching behavior nidus.

Described operation information utilizes the power information acquisition system of distribution automation system to obtain.

Described operation information comprises: voltage effective value, load complex power or active power and power factor.

Described operation information derives from measuring value complete cycle of steady-state operation system.

Described transmission gain adopts form of ratios to describe voltage, power relation under same dimension respectively.

Described method is also recorded and is judged the generation of user electricity filching behavior and the moment of end and position thereof, checks electricity filching behavior further produce evidence for the department of opposing electricity-stealing.

Stealing criterion and location combine together by the method, by stealing electricity phenomenon " transparence ", for the department of opposing electricity-stealing provides examination & verification sharp weapon, retrieve a loss provide Data support accurately for electrical network.

This embodiment is only the present invention's preferably embodiment; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses, the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.

Claims (6)

1. to oppose electricity-stealing a method based on the power distribution network of electric parameter transmission gain matching relationship, it is characterized in that, comprising: step 1, gather the operation information of each node of power distribution network;

Step 2, judge whether certain node voltage is in effective range, if so, then perform step 3, if not, then account for voltage data are wrong, stop stealing differentiating;

Step 3, the calculating transmission gain of a branch road two ends node voltage signal and the transmission gain of this branch power amount;

Step 4, the more above-mentioned power delivery gain that calculates and voltage transmission gain, when both are consistent, then judge no user electricity filching behavior, when both are inconsistent, then judge user electricity filching behavior occurs, when both from inconsistent be consistent again time, then judge that user's electricity filching behavior terminates;

Step 5, repetition step 1 ~ step 4; And bypass position corresponding when working according to criterion locates electricity filching behavior nidus.

2. method according to claim 1, it is characterized in that, described operation information utilizes the power information acquisition system of distribution automation system to obtain.

3. method according to claim 1, it is characterized in that, described operation information comprises: voltage effective value, load complex power or active power and power factor.

4. method according to claim 1, it is characterized in that, described operation information derives from measuring value complete cycle of steady-state operation system.

5. method according to claim 1, is characterized in that, described transmission gain adopts form of ratios to describe voltage, power relation under same dimension respectively.

6. method according to claim 1 or 2 or 3 or 4 or 5, is characterized in that, described method is also recorded and judged the generation of user electricity filching behavior and the moment of end and position thereof, checks electricity filching behavior further produce evidence for the department of opposing electricity-stealing.