CN102565623A - Method and device for online fault search positioning of multi-branch complex distribution network - Google Patents

Abstract

The invention provides a method and a device for online fault search positioning of a multi-branch complex distribution network. The method comprises collecting topology information and electric capacity information of the distribution network to perform calculation to obtain voltage values of all nodes and current values of circuits of the distribution network; then establishing a distribution network equivalent model; determining fault types and fault phases of the distribution network by means of the fault line selection technique, and performing load compensation on the load fluctuation of the distribution network according to real-time data of initial end voltage and current of a feeder line of the distribution network; and performing sectional flow calculation on the distribution network, performing fault positioning algorithm on the current distribution network load value obtained by load compensation, and performing searching section by section until a fault section and a fault point are found out. The method and the device for the online fault search positioning of the multi-branch complex distribution network can be applied to the multi-branch complex distribution network, are capable of achieving online fault positioning, shorten fault repairing time, improve positioning accuracy and reduce investment cost.

Description

The method and apparatus of the online fault search of the complicated power distribution network of a kind of multiple-limb location

Technical field

The application relates to the field of electric network fault search location, relates in particular to the method for the online fault search of the complicated power distribution network of a kind of multiple-limb location, and, the device of the online fault search of the complicated power distribution network of a kind of multiple-limb location.

Background technology

In power technology highly developed today, electrical network is also more and more flourishing.In the power distribution network network of complicacy, have the problem that power circuit breaks down often, so just seem very valuable for the distribution network failure location, for the regulation and control to faulty line, the speed that improves maintenance also benefits.

Main four kinds of existing fault localization method: traveling wave method, impedance method, S signal injection method and fault detector.

Traveling wave method can only be used in the less distribution network of branch, and is offline mode, and the time that fault restoration needs is long;

Impedance method can only be applied in the simple power distribution network of circuit, unsuitable being applied in the complicated power distribution network;

S signal injection method injects the finite energy of signal, if the trouble spot is far apart from circuit top through very big resistance eutral grounding or trouble spot, signal is with very faint can't accurately the measurement so;

The result of use of fault detector is then not really desirable, and accuracy is not high, usually not reaction during electrical network generation singlephase earth fault, and need installing a lot of in the electrical network, invest bigger.

Therefore; Those skilled in the art's urgent problem is: solve the problem that prior art can not be applied in the complicated power distribution network of multiple-limb; Realize online localization of fault, shorten fault correction time, no matter simultaneously in small connect ground resistance or big stake resistance fault; All improve bearing accuracy, and reduced cost of investment.

Summary of the invention

The application's technical matters to be solved provides the method for the online fault search of the complicated power distribution network of a kind of multiple-limb location; Can be applied in the complicated power distribution network of multiple-limb; Realize online localization of fault, shortened fault correction time, no matter simultaneously in small connect ground resistance or big stake resistance fault; All improve bearing accuracy, and reduced cost of investment.

The application also provides the device of the online fault search of the complicated power distribution network of a kind of multiple-limb location simultaneously, to guarantee application and the realization of said method in reality.

In order to address the above problem, the application discloses the method for the online fault search of the complicated power distribution network of a kind of multiple-limb location, specifically can comprise:

Gather the topology information and the electric parameters information of power distribution network;

According to the topology information and the electric parameters information of said power distribution network, carry out the three-phase trend and calculate, the magnitude of voltage of whole nodes and the current value of circuit when obtaining said power distribution network non-fault;

The magnitude of voltage of each node and the current value of circuit calculate the equiva lent impedance between each node on the said distribution power flow path during according to said power distribution network non-fault; Equiva lent impedance through between each node of said power distribution network is set up the power distribution network equivalent model;

When the line failure of said power distribution network, the fault type of determining power distribution network with the failure line selection technology and fault according to the feeder line head end voltage of power distribution network, the real time data of electric current, are carried out load compensation to said power distribution network load fluctuation mutually;

According to the fault type of said power distribution network and fault mutually; Segmentation trend to power distribution network carries out in the fault is calculated; The current power distribution network load value that utilizes load compensation to obtain carries out fault location algorithm; Search for piecemeal until finding fault section and trouble spot, realize the online localization of fault of the complicated power distribution network of multiple-limb.

Preferably, said topology information is the parameter of node, circuit and other equipment of power distribution network; Said electric parameters information is voltage, the current vector value of power distribution network substation bus bar before the fault, and the power of each node, comprises voltage, the current vector value of power distribution network substation bus bar in the fault simultaneously.

Preferably, said distribution power flow path by begin from the distribution feeder headend node to end-node the circuit of process.The circuit that connects adjacent two nodes is called line segment, and the trend path from distribution feeder line head end to terminal load bus is made up of many line segments;

Saidly set up the power distribution network equivalent model through the equiva lent impedance between each node of power distribution network and can comprise:

On a trend path, find out the node of branch, the circuit on these nodes in other branches is represented with an equiva lent impedance with load;

Same processing is done in trend path to other, and then said power distribution network just equivalence has become the equivalent model in many independently trends paths.

Preferably, saidly load compensation is carried out in the power distribution network load fluctuation can comprise:

Define a standard equiva lent impedance, total load condition when representing said power distribution network substation bus bar normally to move;

When fault takes place,, represent current load condition with the total impedance of electric current and voltage data computation of power distribution network substation bus bar before the fault;

Load condition calculated load variable quantity when taking place through said load condition just often and fault calculates the preload of work as of each node, all load values in renewal three-phase power flow algorithm and the fault location algorithm then.

Preferably, said fault type according to said power distribution network and fault are calculated the segmentation trend that power distribution network carries out in the fault mutually, utilize fault location algorithm, search for piecemeal until finding fault section and trouble spot to comprise:

At first first section circuit to article one trend path carries out localization of fault calculating, calculates the distance of trouble spot to first section of line segment.

If on present trend path, do not search the trouble spot, then each line segment to next bar trend path carries out the localization of fault search, up to finding faulty section;

Different trend paths have identical line segment.In order to improve the efficient of fault search, to the line segment of having searched in the trend path computing in front, just no longer search in the fault search in this trend path.

The application discloses the device of the online fault search of the complicated power distribution network of a kind of multiple-limb location simultaneously, specifically can comprise:

Information acquisition module, the topology information and the electric parameters information that are used to gather power distribution network;

Three-phase trend computing module is used for topology information and electric parameters information according to said power distribution network, carries out the three-phase trend and calculates, the magnitude of voltage of whole nodes and the current value of circuit when obtaining said power distribution network non-fault;

Equivalent model is set up module, and the magnitude of voltage of each node and the current value of circuit calculate the equiva lent impedance between each node on the said distribution power flow path when being used for according to said power distribution network non-fault; Equiva lent impedance through between each node of said power distribution network is set up the power distribution network equivalent model;

Fault type and fault be determination module mutually; When being used for the line failure when said power distribution network; The fault type of determining power distribution network with the failure line selection technology and fault according to the feeder line head end voltage of power distribution network, the real time data of electric current, are carried out load compensation to said power distribution network load fluctuation mutually;

The localization of fault module, be used for mutually according to the fault type of said power distribution network and fault; Segmentation trend to power distribution network carries out in the fault is calculated; The current power distribution network load value that utilizes load compensation to obtain carries out fault location algorithm; Search for piecemeal until finding fault section and trouble spot, realize the online localization of fault of the complicated power distribution network of multiple-limb.

Preferably, said topology information is the parameter of node, circuit and other equipment of power distribution network; Said electric parameters information is power distribution network before the fault, the voltage of substation bus bar, current vector value, and the power of each node, comprises voltage, the current vector value of power distribution network substation bus bar in the fault simultaneously.

Preferably, said distribution power flow path by begin from the distribution feeder headend node to end-node the circuit of process.The circuit that connects adjacent two nodes is called line segment, and the trend path from distribution feeder line head end to terminal load bus is made up of many line segments;

Said equivalent model is set up module and can be comprised:

Single trend path modeling submodule is used on a trend path, finding out the node of branch, and the circuit on these nodes in other branches is represented with an equiva lent impedance with load;

Many trends path modeling submodule is used for same processing is done in other trend path, and then said power distribution network just equivalence has become the equivalent model in many independently trends paths.

Preferably, said fault type and fault mutually determination module can comprise:

Scale load definition submodule is used to define a standard equiva lent impedance, total load condition when representing said power distribution network substation bus bar normally to move;

Current load gauge operator module is used for when fault takes place, and with the total impedance of electric current and voltage data computation of power distribution network substation bus bar before the fault, represents current load condition;

The load value updating submodule, load condition calculated load variable quantity when being used for taking place through said load condition just often and fault calculates the preload of work as of each node, all load values in renewal three-phase power flow algorithm and the fault location algorithm then.

Preferably, said localization of fault module can comprise:

Trouble spot distance calculation submodule is used to calculate the distance of trouble spot to first section of line segment; Fault sectioning search submodule, when being used on present trend path, not searching the trouble spot, then each line segment to next bar trend path carries out the localization of fault search, up to finding faulty section;

Fault search chooser module is used for line segment that trend path computing had in front been searched for, just no longer search in the fault search in this trend path.

Compared with prior art, the application has the following advantages:

The method and apparatus of the online fault search of the complicated power distribution network of a kind of multiple-limb that the application provides location; Through setting up the power distribution network equivalent model; Utilize the electric current and voltage data of power distribution network substation bus bar side,, realize the online localization of fault of the complicated power distribution network of multiple-limb through in line computation.Solved the problem that prior art can not be applied in the complicated power distribution network of multiple-limb, realized online localization of fault, fault correction time is no matter simultaneously in small connect ground resistance or big stake resistance fault, all improved bearing accuracy.

And because localization method is operated and calculated through software, therefore do not need a large amount of hardware devices, greatly reduce cost of investment.

Description of drawings

Fig. 1 is the process flow diagram of embodiment of the method for the online fault search of the complicated power distribution network of a kind of multiple-limb of the application location;

Fig. 2 is the structured flowchart of embodiment of the device of the online fault search of the complicated power distribution network of a kind of multiple-limb of the application location;

Fig. 3 is a kind of reduced graph of multiple-limb power distribution network;

Fig. 4 is the equivalent model figure of power distribution network after a kind of fault.

Embodiment

For above-mentioned purpose, the feature and advantage that make the application can be more obviously understandable, the application is done further detailed explanation below in conjunction with accompanying drawing and embodiment.

One of core idea of the application embodiment is, sets up the power distribution network equivalent model, utilizes the electric current and voltage data of power distribution network substation bus bar side, through in line computation, realizes the online localization of fault of the complicated power distribution network of multiple-limb.Be applicable to the power distribution network that multiple-limb is complicated, realize localization of fault formerly, and bearing accuracy is high.

The process flow diagram of the embodiment of the method for the online fault search of the complicated power distribution network of a kind of multiple-limb of the application location that reference is shown in Figure 1 specifically can comprise:

Step 101, the topology information and the electric parameters information of gathering power distribution network;

In a kind of preferred embodiment of the application, said topology information is the parameter of node, circuit and other equipment of power distribution network; Said electric parameters information is power distribution network before the fault, the voltage of substation bus bar, current vector value, and the power of each node, comprises voltage, the current vector value of power distribution network substation bus bar in the fault simultaneously.Step 102, according to the topology information and the electric parameters information of said power distribution network, carry out the three-phase trend and calculate, the magnitude of voltage of whole nodes and the current value of circuit when obtaining said power distribution network non-fault;

In concrete the realization, the three-phase trend is calculated as, and through the voltage (amplitude and phase angle) and the power of each node that has obtained the power distribution network head end before the fault, obtains the three-phase voltage value of each node and the three-phase electricity flow valuve of each bar circuit.

Step 103, the magnitude of voltage of each node and the current value of circuit during according to said power distribution network non-fault calculate the equiva lent impedance between each node of said power distribution network; Equiva lent impedance through between each node of said power distribution network is set up the power distribution network equivalent model;

In a kind of preferred embodiment of the present invention, saidly set up the power distribution network equivalent model through the equiva lent impedance between each node of power distribution network and specifically can comprise:

Substep S11, on a trend path, find out the node of branch, the circuit on these nodes in other branches with the load represent with an equiva lent impedance;

Substep S12, same processing is done in other trend path, then said power distribution network just equivalence has become the equivalent model in many independently trends paths.

In concrete the realization, calculate the anti-resistance of equivalence between each node through following formula:

$Z_{{\mathrm{eq}}_{p-q}}=\frac{V_p}{I_{p-q}}$

Z represents the equiva lent impedance between the end node, the V representative voltage, and I is an electric current; Formula is tried to achieve a p to an equiva lent impedance in this section of q trend path.

Step 104, when the line failure of said power distribution network, the fault type of determining power distribution network with the failure line selection technology and fault according to the feeder line head end voltage of power distribution network, the real time data of electric current, are carried out load compensation to said power distribution network load fluctuation mutually;

In a kind of preferred embodiment of the application, saidly load compensation is carried out in the power distribution network load fluctuation specifically can comprise:

Substep S21, standard equiva lent impedance of definition, total load condition when representing said power distribution network substation bus bar normally to move;

Substep S22, when fault takes place, with the total impedance of electric current and voltage data computation of power distribution network substation bus bar before the fault, represent current load condition;

Substep S23, load condition calculated load variable quantity when taking place through said load condition just often and fault calculate the preload of work as of each node, all load values in renewal three-phase power flow algorithm and the fault location algorithm then.

In concrete the realization, utilize before the fault with fault after head end electric current and voltage data, carry out load compensation.

1, standard equiva lent impedance of definition is represented load condition total when normally moving;

$Z_{\mathrm{Load}-1m}=\frac{V_{\mathrm{Sm}}}{I_{\mathrm{Sm}}}$

Wherein m representes a, b, c phase, V _SmTransformer station's place's voltage under the expression normal operation, I _SmTransformer station's place's electric current under the expression normal operation.

When 2, fault takes place,, represent current load condition with the total impedance of electric current and voltage data computation of transformer station before the fault;

$Z_{\mathrm{Load}-2m}=\frac{V_{\mathrm{Sm}}^{\′}}{I_{\mathrm{Sm}}^{\′}}$

3, calculated load variable quantity

${\mathrm{\Δ}}_{\mathrm{Load}-m}=\frac{Z_{\mathrm{Load}-2m}-Z_{\mathrm{Load}-1m}}{Z_{\mathrm{Load}-1m}}$

4, consider the load variations amount, calculate the preload of working as of each node then, upgrade all load values in three-phase power flow algorithm and the fault location algorithm;

Step 105, mutually according to the fault type of said power distribution network and fault; Segmentation trend to power distribution network carries out in the fault is calculated; The current power distribution network load value that utilizes load compensation to obtain carries out fault location algorithm; Search for piecemeal until finding fault section and trouble spot, realize the online localization of fault of the complicated power distribution network of multiple-limb.

In a kind of preferred embodiment of the present invention; Said fault type according to said power distribution network and fault are mutually; Segmentation trend to power distribution network carries out in the fault is calculated, and utilizes fault location algorithm, searches for piecemeal until finding fault section and trouble spot specifically can comprise:

Substep S31, the equivalent model through said power distribution network branch because a trend path is divided into quite a few sections by node, detect so segment failure is carried out in trend path wherein, at first feeder line head end article one line segment are detected;

Substep S32, calculate through the fault distance computing formula; If fault distance result of calculation is less than or equal to this section line length; Explain that then fault occurs in this section circuit, fault distance is the distance value of the first node of trouble spot and this section circuit just, otherwise this section circuit does not break down; Continuation detects the circuit of back on this trend path successively, up to finding faulty section;

Substep S33, identical fault detect is carried out in other trend path, found out faulty section; In order to improve fault search efficient,,, this trend path failure no longer detects in detecting for the line segment that has detected;

In concrete the realization, when in the power distribution network during certain bar line failure, utilize the power distribution network equivalent model that draws in the module three, the built-up pattern in promptly all trend paths carries out localization of fault.At first, detect a trend path wherein, assumed fault is at first section of this trend path; After the calculating of position determination of fault method; If the fault distance d that obtains, then explains fault greater than this section Route Length not in this circuit, so just the second circuit on this trend path is detected; So continuous recursion backward, up to the fault distance of calculating less than this section Route Length; Then, the similar detection method is adopted in other remaining trend paths, find out the circuit that breaks down; In order to improve search efficiency, for identical circuit in each bar trend path,, then can skip if detected, need not detect once more.

(1) segmentation trend is calculated

When in the power distribution network single-phase short circuit taking place, the aperiodic component of short-circuit current can be decayed in first cycle fast, and the trend between age at failure is calculated steady-state shortcircuit current and the voltage of getting the feeder line head end.Under the situation of known feeder line head end voltage and current value, just can obtain the voltage and the line electricity flow valuve of other all nodes on the trend path through recursion, following in conjunction with Fig. 4 recursion principle:

[V _k+1]＝[V _k]-[Z _k]·[I _k]

Wherein

[V _k] represent that the three-phase voltage of first section of k section circuit is vectorial;

[Z _k] impedance (self-impedance and the transimpedance) matrix of expression k section circuit;

[I _k] current vector in the expression k section circuit.

After regarding load as the constant-impedance models treated, then can obtain the load current value of next section circuit head end:

$\left[I_{L_{k+1}}\right]=\left[Y_{L_{k+1}}\right]\left[V_{k+1}\right]$

Both subtract each other, and can get the current value in next section circuit:

$\left[I_{k+1}\right]=\left[I_k\right]-\left[I_{L_{k+1}}\right]$

(2) localization of fault

In the localization of fault principle, drawn the relational expression of fault distance and fault current, from relational expression, can find out, ask the key of fault distance to be to calculate fault current.The specific algorithm step of fault distance is following:

1) input fault type and fault are mutually;

2) during fault, suppose that fault phase load electric current equals fault preload electric current, i.e. I _Lm=I _{Pr_1m}(m represents the fault phase);

3) ask fault current I _Fm=I _m-I _Lm

4), adopt different formulas to calculate the trouble spot apart from d according to the different faults type;

The relation of different faults type fault distance and false voltage electric current

1. singlephase earth fault

$\left[\begin{array}{c}d\\ R_f\end{array}\right]={\left[\begin{array}{cc}{M}_1& I_{\mathrm{fmr}}\\ M_2& I_{\mathrm{fmi}}\end{array}\right]}^{-1}\·\left[\begin{array}{c}{V}_{\mathrm{mr}}\\ V_{\mathrm{mi}}\end{array}\right]---\left(1\right)$

Wherein

$\begin{array}{ccc}{M}_1=\underset{k}{\mathrm{\Σ}}(Z_{{\mathrm{mk}}_r}{I}_{k_r}-Z_{{\mathrm{mk}}_i}{I}_{k_i})& M_2=\underset{k}{\mathrm{\Σ}}(Z_{{\mathrm{mk}}_r}{I}_{k_i}+Z_{{\mathrm{mk}}_i}{I}_{k_r})& k=a,b,c\end{array}---\left(2\right)$

2. double earthfault

$\left[\begin{array}{c}d\\ R_{\mathrm{fm}}\\ R_{\mathrm{fn}}\\ R_{\mathrm{fmn}}\end{array}\right]={\left[\begin{array}{cccc}{M}_{1m}& I_{\mathrm{fmr}}& 0& I_{\mathrm{fmr}}+I_{\mathrm{fnr}}\\ M_{2m}& I_{\mathrm{fmi}}& 0& I_{\mathrm{fmi}}+I_{\mathrm{fni}}\\ M_{1n}& 0& I_{\mathrm{fnr}}& I_{\mathrm{fmr}}+I_{\mathrm{fnr}}\\ M_{2n}& 0& I_{\mathrm{fnr}}& I_{\mathrm{fmi}}+I_{\mathrm{fni}}\end{array}\right]}^{-1}\left[\begin{array}{c}{V}_{\mathrm{mr}}\\ V_{\mathrm{mi}}\\ V_{\mathrm{nr}}\\ V_{\mathrm{ni}}\end{array}\right]---\left(3\right)$

M in its Chinese style ₁, M ₂Identical with (2) formula

3. two-phase short-circuit fault

$\left[\begin{array}{c}d\\ R_f\end{array}\right]={\left[\begin{array}{cc}{M}_3& I_{\mathrm{fr}}\\ M_4& I_{\mathrm{fi}}\end{array}\right]}^{-1}\·\left[\begin{array}{c}{V}_{\mathrm{mr}}-V_{\mathrm{nr}}\\ V_{\mathrm{mi}}-V_{\mathrm{ni}}\end{array}\right]---\left(4\right)$

Wherein

$M_3=\underset{k}{\mathrm{\Σ}}[(Z_{\mathrm{mkr}}-Z_{\mathrm{nkr}})I_{\mathrm{kr}}-(Z_{\mathrm{mki}}-Z_{\mathrm{nki}})I_{\mathrm{ki}}]$

$M_4=\underset{k}{\mathrm{\Σ}}[(Z_{\mathrm{mkr}}-Z_{\mathrm{nkr}})I_{\mathrm{kr}}+(Z_{\mathrm{mki}}-Z_{\mathrm{nki}})I_{\mathrm{ki}}]---\left(5\right)$

4. three phase short circuit fault

M wherein _1m, M _2mIdentical with (2) formula

5) whether check fault distance d restrains

|d _new-d _old|＜δ

Wherein at the seasonal d that circulates for the first time _Old=0; δ representes error amount;

6), otherwise continue to calculate if the d convergence then stops to calculate;

7) calculate fault point voltage

$\left[\begin{array}{c}{V}_{\mathrm{fa}}\\ V_{\mathrm{fb}}\\ V_{\mathrm{fc}}\end{array}\right]=\left[\begin{array}{c}{V}_a\\ V_b\\ V_c\end{array}\right]-d\·\left[\begin{array}{ccc}{Z}_{\mathrm{aa}}& Z_{\mathrm{ab}}& Z_{\mathrm{ac}}\\ Z_{\mathrm{ba}}& Z_{\mathrm{bb}}& Z_{\mathrm{bc}}\\ Z_{\mathrm{ca}}& Z_{\mathrm{cb}}& Z_{\mathrm{cc}}\end{array}\right]\·\left[\begin{array}{c}{I}_a\\ I_b\\ I_c\end{array}\right]$

8) utilize fault point voltage to recomputate load current I _Lm

$I_{\mathrm{Lm}}=\left[\begin{array}{ccc}{Y}_{\mathrm{ma}}& Y_{\mathrm{mb}}& Y_{\mathrm{mc}}\end{array}\right]\·\left[\begin{array}{c}{V}_{\mathrm{fa}}\\ V_{\mathrm{fb}}\\ V_{\mathrm{fc}}\end{array}\right]$

$Y_{\mathrm{mk}}={[(l-d)Z_{\mathrm{mk}}+Z_{L_{\mathrm{mk}}}]}^{-1}$

K representes a, b, c three-phase, Y in the formula _MkCircuit self-impedance or transimpedance between expression m and the k phase, Z _LmkSelf-impedance or transimpedance between expression m and the k phase load.

9) get back to step 2), continue iterative computation.

Those skilled in the art understand the application better for ease, below illustrate further the application through a complete example:

For feasibility, precision and the robustness of verification algorithm, in PSCAD software, built the power distribution network model of one 16 node 15 branches, like Fig. 3.

Below we analyze the influence of factors such as transition resistance, fault distance and load fluctuation to the robustness of bearing accuracy and algorithm respectively.

1) transition resistance

Set circuit 2-7 single phase ground fault, the length of circuit 2-7 is L=402 rice, off-line road, trouble spot head end apart from d ₀=201 meters, establish transition resistance R respectively _fDuring=0,10,20,50,100,200 Ω, the result of localization of fault is as shown in table 1.Visible by table 1, along with transition resistance R _fIncrease, error also obviously increases, wherein R _f=0 and R _fRelative error between=200 Ω has reached 5.5% of this Route Length.When Single Phase Metal property earth fault takes place is R _f=0 o'clock, the absolute error of the actual range of trouble spot and the fault distance that calculates was in 1 meter, and accuracy rate is very high; This is because the metallicity single-line to ground fault; Load current after the trouble spot is very little, and fault current is very big, and the fault current that calculates is very approaching with real fault current.Along with the increase of transition resistance, the fault distance of calculating and the error of actual value increase gradually, mainly due to along with R _fIncrease, the evaluated error of the load current behind the trouble spot is also bigger than normal, thereby makes the fault current and the actual value error that calculate become big.The Low ESR singlephase earth fault when taking place in data presentation, and this localization method is very effective, and robustness is fine.

Table 1 transition resistance R _fInfluence

The computed range of d-trouble spot and circuit head end, ε _r-relative error, ε _r=| d ₀-d|/L, ε-absolute error, ε=d ₀-d, following same-sign same meaning.

2) fault distance

For the influence of analysis of failure distance, on different circuits, set fault respectively, and three diverse locations on the same line road (being respectively 10%, 50% and 90% place of this section line length) are provided with the trouble spot.Simultaneously respectively to R _fCarry out localization of fault under two kinds of conditions of=0 and 20 Ω and calculate, result of calculation is seen table 2 and table 3.Visible by table 2 and table 3,2-3 is the longest for circuit, and fault distance is long more, and the error of localization of fault also increases gradually, but the error variation is not very greatly.In the same line road, the size of fault distance is not the deciding factor of error size, because the fault that has is near from this circuit head end, error is bigger, and the fault that has is far away from this circuit head end, and error is little.These data results show that fault distance does not have the precision of appreciable impact localization of fault.

Influence (the R of table 2 fault distance _f=0 Ω)

Influence (the R of table 3 fault distance _f=20 Ω)

This line length of L-, d ₀The actual range of-trouble spot and circuit head end.

3) load fluctuation

In order to verify the influence of load fluctuation to precision, the load in the power distribution network is done 20% and-20% variation respectively, and at transition resistance R _fUnder the conditions such as=0,50,100,200 Ω, circuit 7-12 is carried out localization of fault, this line length L=183 rice, position of failure point d ₀=92 meters, promptly at the mid point of this section circuit.In order to compare, the positioning result that does not carry out the load fluctuation correction and load fluctuation is revised is shown in table 4 and table 5.Wherein ε is the fault distance that load calculates when not revising, and ε r is a relative error, and the fault distance that ε 1 calculates after revising for loading, ε r1 are the revised relative error of load.As fault resstance R _f=0 o'clock, ε _rWith ε _R1Differ very little, explain that load variations is very little to affect positioning at this moment, this mainly is because work as R _f=0 o'clock, the electric current of fault current and feeder line side was approaching and all very big.But when transition resistance increases, ε _rIncrease significantly, work as R _fIn the time of=200 ohm, ε _rMaximum reaches 72.6%, and such error can cause the erroneous judgement of fault section.Through the load fluctuation compensation method that front 3.3 joints propose, under the situation of same faulty line and transition resistance, error greatly reduces, and maximum error is 10.8%, promptly 19.7 meters.It is thus clear that, only utilize the electric current and voltage information of first section of feeder line that load fluctuation is simply revised, just can increase substantially bearing accuracy.Also notice simultaneously, if fault occurs under the very big extreme case of first section of this section circuit or end and transition resistance the situation of the section that still may break down erroneous judgement.

Table 4 load reduces

Table 5 load increases

Show the structured flowchart of embodiment of the device of the online fault search of the complicated power distribution network of a kind of multiple-limb of the application location with reference to figure 2, specifically can comprise:

Information acquisition module 201, the topology information and the electric parameters information that are used to gather power distribution network;

In a kind of preferred embodiment of the application, said topology information is the parameter of the node and the circuit of power distribution network; Said electric parameters information is the electric current and voltage vector value of power distribution network substation bus bar in power distribution network before the fault, the fault, and the power of each node.

Three-phase trend computing module 202 is used for topology information and electric parameters information according to said power distribution network, carries out the three-phase trend and calculates, the magnitude of voltage of whole nodes and the current value of circuit when obtaining said power distribution network non-fault;

Equivalent model is set up module 203, and the magnitude of voltage of each node and the current value of circuit calculate the equiva lent impedance between each node of said power distribution network when being used for according to said power distribution network non-fault; Equiva lent impedance through between each node of said power distribution network is set up the power distribution network equivalent model;

In a kind of preferred embodiment of the application, said equivalent model is set up module 203 specifically can comprise following submodule:

Single trend path modeling submodule S41 is used on a trend path, finding out the node of branch, and the circuit on these nodes in other branches is represented with an equiva lent impedance with load;

Many trends path modeling submodule S42 is used for same processing is done in other trend path, and then said power distribution network just equivalence has become the equivalent model in many independently trends paths.

Fault type and fault be determination module 204 mutually; When being used for the line failure when said power distribution network; The fault type of determining power distribution network with the failure line selection technology and fault are mutually; According to the feeder line head end voltage of power distribution network, the real time data of electric current, load compensation is carried out in said power distribution network load fluctuation;

In a kind of preferred embodiment of the application,, said fault type and fault determination module 204 mutually specifically can comprise following submodule:

Scale load definition submodule S51 is used to define a standard equiva lent impedance, total load condition when representing said power distribution network substation bus bar normally to move;

Current load gauge operator module S52 is used for when fault takes place, and with the total impedance of electric current and voltage data computation of power distribution network substation bus bar before the fault, represents current load condition;

Load value updating submodule S53, load condition calculated load variable quantity when being used for taking place through said load condition just often and fault calculates the preload of work as of each node, all load values in renewal three-phase power flow algorithm and the fault location algorithm then.

Localization of fault module 205, be used for mutually according to the fault type of said power distribution network and fault; Segmentation trend to power distribution network carries out in the fault is calculated; The current power distribution network load value that utilizes load compensation to obtain carries out fault location algorithm; Search for piecemeal until finding fault section and trouble spot, realize the online localization of fault of the complicated power distribution network of multiple-limb.

In a kind of preferred embodiment of the application, said localization of fault module 205 specifically can comprise following submodule:

Trouble spot distance calculation submodule S61 is used to calculate the distance of trouble spot to first section of line segment;

In concrete the realization, if the fault distance that calculates is less than or equal to this section Route Length, explain that fault occurs in this section circuit, fault distance just equals the distance between trouble spot and the first node of this section circuit; Otherwise this section circuit does not break down, and continues the line segment of back on this trend path is carried out localization of fault calculating, the final stage up to this trend path successively.

Fault sectioning search submodule S62, when being used on present trend path, not searching the trouble spot, then each line segment to next bar trend path carries out the localization of fault search, up to finding faulty section;

Fault search chooser module S63 is used for line segment that trend path computing had in front been searched for, just no longer search in the fault search in this trend path.

Because said device embodiment is basically corresponding to preceding method embodiment, so not detailed part in the description of present embodiment can just not given unnecessary details at this referring to the related description in the previous embodiment.

The application can describe in the general context of the computer executable instructions of being carried out by computing machine, for example program module.Usually, program module comprises the routine carrying out particular task or realize particular abstract, program, object, assembly, data structure or the like.Also can in DCE, put into practice the application, in these DCEs, by through communication network connected teleprocessing equipment execute the task.In DCE, program module can be arranged in this locality and the remote computer storage medium that comprises memory device.

More than the method for the online fault search of the complicated power distribution network of a kind of multiple-limb location and the device of the online fault search of the complicated power distribution network of a kind of multiple-limb location had carried out detailed introduction to the application provides; Used concrete example among this paper the application's principle and embodiment are set forth, the explanation of above embodiment just is used to help to understand the application's method and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to the application's thought, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as the restriction to the application.

Claims (10)

1. the method for the online fault search of the complicated power distribution network of a multiple-limb location is characterized in that, comprising:

Gather the topology information and the electric parameters information of power distribution network;

According to the topology information and the electric parameters information of said power distribution network, carry out the three-phase trend and calculate, the magnitude of voltage of whole nodes and the current value of circuit when obtaining said power distribution network non-fault;

The magnitude of voltage of each node and the current value of circuit calculate the equiva lent impedance between each node on the said distribution power flow path during according to said power distribution network non-fault; Equiva lent impedance through between each node of said power distribution network is set up the power distribution network equivalent model;

When the line failure of said power distribution network, the fault type of determining power distribution network with the failure line selection technology and fault according to the feeder line head end voltage of power distribution network, the real time data of electric current, are carried out load compensation to said power distribution network load fluctuation mutually;

According to the fault type of said power distribution network and fault mutually; Segmentation trend to power distribution network carries out in the fault is calculated; The current power distribution network load value that utilizes load compensation to obtain carries out fault location algorithm; Search for piecemeal until finding fault section and trouble spot, realize the online localization of fault of the complicated power distribution network of multiple-limb.

2. the method for claim 1 is characterized in that, said topology information is the parameter of node, circuit and other equipment of power distribution network; Said electric parameters information is voltage, the current vector value of power distribution network substation bus bar before the fault, and the power of each node, comprises voltage, the current vector value of power distribution network substation bus bar in the fault simultaneously.

3. method as claimed in claim 2 is characterized in that, said distribution power flow path by begin from the distribution feeder headend node to end-node the circuit of process.The circuit that connects adjacent two nodes is called line segment, and the trend path from distribution feeder line head end to terminal load bus is made up of many line segments;

Saidly set up the power distribution network equivalent model through the equiva lent impedance between each node of power distribution network and comprise:

On a trend path, find out the node of branch, the circuit on these nodes in other branches is represented with an equiva lent impedance with load;

Same processing is done in trend path to other, and then said power distribution network just equivalence has become the equivalent model in many independently trends paths.

4. method as claimed in claim 3 is characterized in that, saidly load compensation is carried out in the power distribution network load fluctuation comprises:

Define a standard equiva lent impedance, total load condition when representing said power distribution network substation bus bar normally to move;

When fault takes place,, represent current load condition with the total impedance of electric current and voltage data computation of power distribution network substation bus bar before the fault;

Load condition calculated load variable quantity when taking place through said load condition just often and fault calculates the preload of work as of each node, all load values in renewal three-phase power flow algorithm and the fault location algorithm then.

5. method as claimed in claim 4; It is characterized in that said fault type according to said power distribution network and fault are calculated the segmentation trend that power distribution network carries out in the fault mutually; Utilize fault location algorithm, search for piecemeal until finding fault section and trouble spot to comprise:

At first first section circuit to article one trend path carries out localization of fault calculating, calculates the distance of trouble spot to first section of line segment.

If on present trend path, do not search the trouble spot, then each line segment to next bar trend path carries out the localization of fault search, up to finding faulty section;

Different trend paths have identical line segment.In order to improve the efficient of fault search, to the line segment of having searched in the trend path computing in front, just no longer search in the fault search in this trend path.

6. the device of the online fault search of the complicated power distribution network of a multiple-limb location is characterized in that, comprising:

Information acquisition module, the topology information and the electric parameters information that are used to gather power distribution network;

Three-phase trend computing module is used for topology information and electric parameters information according to said power distribution network, carries out the three-phase trend and calculates, the magnitude of voltage of whole nodes and the current value of circuit when obtaining said power distribution network non-fault;

Equivalent model is set up module, and the magnitude of voltage of each node and the current value of circuit calculate the equiva lent impedance between each node on the said distribution power flow path when being used for according to said power distribution network non-fault; Equiva lent impedance through between each node of said power distribution network is set up the power distribution network equivalent model;

Fault type and fault be determination module mutually; When being used for the line failure when said power distribution network; The fault type of determining power distribution network with the failure line selection technology and fault according to the feeder line head end voltage of power distribution network, the real time data of electric current, are carried out load compensation to said power distribution network load fluctuation mutually;

The localization of fault module, be used for mutually according to the fault type of said power distribution network and fault; Segmentation trend to power distribution network carries out in the fault is calculated; The current power distribution network load value that utilizes load compensation to obtain carries out fault location algorithm; Search for piecemeal until finding fault section and trouble spot, realize the online localization of fault of the complicated power distribution network of multiple-limb.

7. device as claimed in claim 6 is characterized in that, said topology information is the parameter of node, circuit and other equipment of power distribution network; Said electric parameters information is power distribution network before the fault, the voltage of substation bus bar, current vector value, and the power of each node, comprises voltage, the current vector value of power distribution network substation bus bar in the fault simultaneously.

8. device as claimed in claim 7 is characterized in that, said distribution power flow path by begin from the distribution feeder headend node to end-node the circuit of process.The circuit that connects adjacent two nodes is called line segment, and the trend path from distribution feeder line head end to terminal load bus is made up of many line segments;

Said equivalent model is set up module and is comprised:

Single trend path modeling submodule is used on a trend path, finding out the node of branch, and the circuit on these nodes in other branches is represented with an equiva lent impedance with load;

Many trends path modeling submodule is used for same processing is done in other trend path, and then said power distribution network just equivalence has become the equivalent model in many independently trends paths.

9. method as claimed in claim 8 is characterized in that, said fault type and fault determination module mutually comprise:

Scale load definition submodule is used to define a standard equiva lent impedance, total load condition when representing said power distribution network substation bus bar normally to move;

Current load gauge operator module is used for when fault takes place, and with the total impedance of electric current and voltage data computation of power distribution network substation bus bar before the fault, represents current load condition;

The load value updating submodule, load condition calculated load variable quantity when being used for taking place through said load condition just often and fault calculates the preload of work as of each node, all load values in renewal three-phase power flow algorithm and the fault location algorithm then.

10. method as claimed in claim 9 is characterized in that, said localization of fault module comprises:

Trouble spot distance calculation submodule is used to calculate the distance of trouble spot to first section of line segment; Fault sectioning search submodule, when being used on present trend path, not searching the trouble spot, then each line segment to next bar trend path carries out the localization of fault search, up to finding faulty section;

Fault search chooser module is used for line segment that trend path computing had in front been searched for, just no longer search in the fault search in this trend path.

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