CN105162097A - Training simulation method and simulation system of distribution network fault treatment process - Google Patents

Abstract

The invention discloses a training simulation method and simulation system of a distribution network fault treatment process. The method comprises: a fault point is set; a fault current is calculated; the fault current obtained by calculation is compared with a preset protection constant value and whether the fault current is larger than the protection constant value is determined; if so, a relay protection motion is triggered; if not, a next step is carried out; a protection constant value is reset and a step S11 is carried out, so that the steps are carried out repeatedly and continuously. The system includes a fault setting module, a fault current calculation module, a relay protection triggering determination module, a protection constant value resetting module. The fault setting module is used for setting a fault point. The fault current calculation module is used for calculating a fault current. And the relay protection triggering determination module is used for determining whether the fault current is larger than the protection constant value; if so, the relay protection motion is triggered; and if not, the protection constant value is reset. The protection constant value resetting module is used for resetting a protection constant value. Therefore, a fault occurring in a distribution network can be reflected actually and accurately; and the dispatching decision capability of the distribution network dispatcher is also improved.

Description

A kind of Simulated training method of distribution network failure processing procedure and analogue system

Technical field

The present invention relates to power distribution network scheduling training, particularly a kind of Simulated training method of distribution network failure processing procedure and analogue system.

Background technology

In recent years, along with the fast development of intelligent power distribution network construction, the update of controller switching equipment and electrical power distribution automatization system makes scene increase rapidly the demand of distribution dispatcher, and the training requirement of power distribution network dispatcher is very urgent.As everyone knows, the academic level of power distribution network dispatcher and difference of technology level larger, therefore, complete power distribution network scheduling Training Simulation System must be set up, set up half Training Environment in kind, the true environment of real-time Simulation power distribution network, could meet the demand of high-level power distribution network dispatcher training.

Power distribution network scheduling Training Simulation System is the product that modernization computer hardware technique and power system analysis technology combine, its main purpose is a training power distribution network scheduling Training Simulation System wherein important function of the dispatcher of power distribution network being carried out to system, be improve the power distribution network dispatcher scheduling decision ability in the situations such as the normal accident of electrical network and recovery, thus reduce grid power blackout time, fast isolated fault and recover fault zone and power.The emulation of relaying protection action when distribution network failure is occurred; it is the basis of distribution network failure process; Protection simulation system is with regard to the requirement of demand fulfillment authenticity, real-time; former reason condition in the actual power distribution network of true reflection that only can be real-time; better can give training dispatcher, improve its scheduling decision ability.

Therefore, be badly in need of providing a kind of Training Simulation System that can reflect distribution network failure processing procedure truly, in real time.

Summary of the invention

The present invention is directed to above-mentioned problems of the prior art, propose a kind of Simulated training method of distribution network failure processing procedure and establish analogue system, the fault occurred in reflection power distribution network that can be true, real-time, improves the scheduling decision ability of power distribution network dispatcher.

For solving the problems of the technologies described above, the present invention is achieved through the following technical solutions:

The invention provides a kind of Simulated training method of distribution network failure processing procedure, it comprises the following steps:

S11: fault point and fault type are set;

S12: calculate fault current;

S13: the fault current calculated and the protection definite value preset are compared, judge whether described fault current is greater than described protection definite value, if it is triggers relaying protection action, if otherwise enter next step;

S14: reset protection definite value, enter step S11, so circulate.

Preferably, described step S12 comprises further:

S121: search outlet breaker, calculates the positive sequence equivalent impedance of failure path, negative phase-sequence equivalent impedance and zero sequence equivalent impedance;

S122: determine fault type, calculates fault current according to fault type.

Preferably, described step S121 is further: utilize Depth Priority Searching to search for outlet breaker, calculate the positive sequence equivalent impedance of failure path, negative phase-sequence equivalent impedance and zero sequence equivalent impedance.

Preferably, described step S122 is further: utilize equivalent voltage source method to calculate fault current, the design conditions of described equivalent voltage source method comprise:

(1) positive sequence impedance is equal with negative sequence impedance;

(2) failure path has completely to shaping, not coupling between three sequence variablees;

(3) load current is disregarded;

(4) before fault, voltage is rated voltage.

Preferably, described fault type comprises:

Three-phase ground short trouble, its fault current is:

$I_K^{\left(3\right)}=I_{k1}^{\left(3\right)}=cU/\left(\sqrt{3}{Z}_1\right)$

Two-phase phase fault, its fault current is:

$I_k^{(1,1)}=\sqrt{3}\×\sqrt{1-\frac{\left|z_2{z}_0\right|}{{\left(\right|z_2+Z_0\left|\right)}^2}}\×I_{k1}^{(1,1)}=\sqrt{1-\frac{\left|Z_2{Z}_0\right|}{{\left(\right|Z_2+Z_0\left|\right)}^2}}\×\frac{cU}{\left|Z_1+\frac{Z_2{Z}_0}{Z_2+Z_0}\right|}$

Two-phase short circuit and ground fault, its fault current is:

$I_k^{\left(2\right)}=\sqrt{3}\×I_{k1}^{\left(2\right)}=\frac{3cU}{\left|Z_1+Z_2\right|}$

Single-phase grounding fault, its fault current is:

$I_k^{\left(1\right)}=3\×I_{k1}^{\left(1\right)}=\frac{\sqrt{3}cU}{\left|Z_1+Z_2+Z_0\right|};$

Wherein: Z ₁, Z ₂, Z ₀represent positive sequence, negative phase-sequence and zero sequence equivalent impedance respectively, with represent three-phase, alternate, two-phase and single-phase earthing fault electric current respectively, with represent forward-order current when three-phase, alternate, two-phase and single-phase short circuit respectively, fault point equivalent voltage source wherein U is rated voltage, and c is voltage coefficient.

The present invention also provides a kind of Training Simulation System of distribution network failure processing procedure, and it comprises: fault setting module, for setting fault point and fault type;

Fault current computing module, for calculating fault current;

Triggering relaying protection judge module, for judging whether described fault current is greater than protection definite value, if it is triggering relaying protection action, otherwise protection definite value is reset;

Protection definite value resets module, for resetting protection definite value.

Preferably, described fault setting module comprises:

Three-phase ground short-circuit unit, for setting three-phase ground short trouble;

Two-phase grounding fault unit, for setting two-phase short circuit and ground fault;

Two-phase phase fault unit, for setting two-phase phase fault;

Single-line to ground fault unit, for setting single-phase grounding fault.

Preferably, described fault current computing module comprises:

Fault type determining unit, for determining fault type;

Fault current computing unit, for calculating fault current according to described fault type.

Preferably, described fault type determining unit comprises:

Fault location and search unit, for utilizing depth first method to search for outlet breaker, determine failure path;

Equivalent impedance computing unit, for according to failure path, calculates the positive sequence equivalent impedance of failure path, negative phase-sequence equivalent impedance and zero sequence equivalent impedance.

Preferably, described fault current computing unit, calculates fault current for utilizing equivalent voltage source method;

The design conditions of described equivalent voltage source method are:

(1) positive sequence impedance is equal with negative sequence impedance;

(2) circuit has symmetry completely, not coupling between three sequence variablees;

(3) load current is disregarded;

(4) before fault, voltage is rated voltage.

Preferably, the fault current computing formula of described three-phase ground short trouble is:

$I_K^{\left(3\right)}=I_{k1}^{\left(3\right)}=cU/\left(\sqrt{3}{Z}_1\right)$

The fault current computing formula of described two-phase phase fault is:

$I_k^{(1,1)}=\sqrt{3}\×\sqrt{1-\frac{\left|z_2{z}_0\right|}{{\left(\right|z_2+Z_0\left|\right)}^2}}\×I_{k1}^{(1,1)}=\sqrt{1-\frac{\left|Z_2{Z}_0\right|}{{\left(\right|Z_2+Z_0\left|\right)}^2}}\×\frac{cU}{\left|Z_1+\frac{Z_2{Z}_0}{Z_2+Z_0}\right|}$

The fault current computing formula of described two-phase short circuit and ground fault is:

$I_k^{\left(2\right)}=\sqrt{3}\×I_{k1}^{\left(2\right)}=\frac{3cU}{\left|Z_1+Z_2\right|}$

The fault current computing formula of described single-phase grounding fault is:

$I_k^{\left(1\right)}=3\×I_{k1}^{\left(1\right)}=\frac{\sqrt{3}cU}{\left|Z_1+Z_2+Z_0\right|};$

Wherein: Z ₁, Z ₂, Z ₀represent positive sequence, negative phase-sequence and zero sequence equivalent impedance respectively, with represent three-phase, alternate, two-phase and single-phase earthing fault electric current respectively, with represent forward-order current when three-phase, alternate, two-phase and single-phase short circuit respectively, fault point equivalent voltage source wherein U is rated voltage, and c is voltage coefficient.

Compared to prior art, the present invention has the following advantages:

(1) Simulated training of distribution network failure processing procedure provided by the invention is violated the law and analogue system, the relaying protection of the actual power distribution network of true reflection, improves taking relaying protection action and checking the ability of relay protection constant value when dispatcher is broken down to power distribution network;

(2) calculation of short-circuit current of the present invention adopts equivalent electric platen press, under the condition ensureing computational accuracy, carry out simplify processes, ensure that accuracy and the rapidity of result of calculation, meet the requirement of emulation real-time, reflect the scheduling decision ability of dispatcher more really;

(3) the present invention can emulate the various faults occurred in power distribution network, the faults such as three-phase ground short circuit, two-phase grounding fault, the alternate ground short circuit of two-phase and single-line to ground fault can be carried out and carry out analog simulation, more comprehensively reflect in actual power distribution network the various faults occurred, comprehensively can train dispatcher;

(4) for the feature of power distribution network, utilize Depth Priority Searching determination failure path, calculate fault equivalent impedance the most rapidly, determine the position of circuit breaker simultaneously, the judgement of convenient verification protection act;

(5) when arranging fault, according to fault type and place, different voltage coefficients and impedance ground can be selected, utilize voltage coefficient and impedance ground, the computational accuracy of further raising short-circuit current, and then provide reliable foundation for checking protection definite value; By short circuit calculation electric current accurately, be: as short circuit current is greater than protection definite value then think that the setting of protection definite value is correct to the principle that protection definite value is checked; Otherwise think that setting is incorrect.

Certainly, implement arbitrary product of the present invention might not need to reach above-described all advantages simultaneously.

Accompanying drawing explanation

Below in conjunction with accompanying drawing, embodiments of the present invention are described further:

Fig. 1 is the flow chart of the Simulated training method of distribution network failure processing procedure of the present invention;

Fig. 2 is radial pattern distribution network failure path profile of the present invention;

Fig. 3 is depth-first search process schematic of the present invention;

Fig. 4 is the structural representation of the Training Simulation System of distribution network failure processing procedure of the present invention;

Fig. 5 is the structural representation of the Training Simulation System of the distribution network failure processing procedure of preferred embodiment of the present invention.

Label declaration: 1-fault setting module, 2-fault current computing module, 3-triggers relaying protection judge module, and 4-protects definite value to reset module;

11-three-phase ground short-circuit unit, 12-two-phase grounding fault unit, 13-two-phase phase fault unit, 14 single-line to ground fault unit;

21-fault type determining unit, 22-fault current computing unit;

211-fault location and search unit, 212-equivalent impedance computing unit.

Embodiment

Elaborate to embodiments of the invention below, the present embodiment is implemented under premised on technical solution of the present invention, give detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.

Composition graphs 1, be described in detail the Simulated training method of distribution network failure processing procedure of the present invention, it comprises the following steps:

S11: fault point and fault type are set;

S12: calculate fault current;

S13: the fault current calculated and the protection definite value preset are compared, judge whether described fault current is greater than described protection definite value, if it is triggers relaying protection action, if otherwise enter next step;

S14: reset protection definite value, enter step S11, so circulate, checks protection definite value, arranges suitable protection definite value, as long as break down, just triggers relaying protection action.

Wherein: the type of the fault point arranged in step S11 can have multiple, comprising: three-phase ground short trouble, two-phase short circuit and ground fault, two-phase phase fault, single-phase grounding fault etc.

Step S12 comprises further:

S121: utilize Depth Priority Searching to search for outlet breaker, calculate the positive sequence equivalent impedance of failure path, negative phase-sequence equivalent impedance and zero sequence equivalent impedance;

S122: by the fault arranged in step S11, determine fault type, can call different computing formula according to fault type and calculate fault current.

Be in particular: utilize equivalent voltage source method to calculate fault current, the design conditions of equivalent voltage source method comprise:

(1) positive sequence impedance is equal with negative sequence impedance;

(2) failure path has completely to shaping, not coupling between three sequence variablees;

(3) load current is disregarded;

(4) before fault, voltage is rated voltage.

Power distribution network is generally radiation position operational mode, when distribution line a bit breaks down, is positioned at the load dead electricity in downstream, fault point, and the distribution line being arranged in fault upstream point has fault current and produces.In radial networks, search for until power supply as upstream carried out along fault point, this path is the path that fault current flows through, and will be easy to accordingly calculate out of order positive sequence equivalent impedance.

As shown in Figure 2, when an error occurs, short circuit current will flow to fault point by power end, being then calculated as of positive sequence equivalent impedance:

Z ₁＝Z _a+Z _b+Z _c+Z _d+Z _e

According to the hypothesis of equivalent Source Method, negative phase-sequence equivalent impedance adopts the value identical with positive sequence equivalent impedance.Above formula positive sequence impedance is then replaced with corresponding zero sequence impedance value by the calculating of zero sequence impedance, can be calculated equally.

Utilize the radial feature of power distribution network, in order to search the supply path shown in Fig. 2 faster, the present invention adopts based on the Depth Priority Searching of fault point, and depth-first search (Depth ?FirstSearch, DFS) is a kind of searching method based on graph theory, substantially DFS carries out according to the following procedure, from vertex v, v is labeled as and has arrived summit, then select a summit u not yet arrived adjoined with v, if such u does not exist, search stops.Suppose that such u exists, so from u again a new DFS.At the end of the search from u, then the summit not yet arrived selecting another one and v to adjoin, if such summit does not exist, so search for termination.And if there is such summit, DFS from this summit, so circulation is gone down.

Depth-first search process as shown in Figure 3, from summit 1., first along 2. → 3. → 4. searched for a paths, as do not found power supply point, return 2., along 5. → 6. search for next paths; As also do not found power supply point, return 1., along 7. → 8., searched for all paths.When finding power supply point on any paths, then stop search immediately.

When utilizing equivalent Source Method to calculate short circuit current, short dot equivalent voltage source wherein U is rated voltage, and c is voltage coefficient (slightly different when calculating minimum and maximum short circuit current).When calculation of short-circuit current, as power distribution network does not have its elsewhere to break down, this voltage source will become the unique voltage source of network, and the voltage of other power supplys is all zero.When be short-circuited in power distribution network somewhere fault time, to the different short-circuit-type that power distribution network Training Simulation System is supported, equivalent voltage source can be utilized to calculate the forward-order current component of various short dot, again according to the relation between the faulted phase current of short dot and the forward-order current of short dot, can short circuit current be calculated as follows:

(1) three-phase ground short trouble,

$I_K^{\left(3\right)}=I_{k1}^{\left(3\right)}=cU/\left(\sqrt{3}{Z}_1\right)$

(2) two-phase short circuit and ground fault,

$I_k^{(1,1)}=\sqrt{3}\×\sqrt{1-\frac{\left|z_2{z}_0\right|}{{\left(\right|z_2+Z_0\left|\right)}^2}}\×I_{k1}^{(1,1)}=\sqrt{1-\frac{\left|Z_2{Z}_0\right|}{{\left(\right|Z_2+Z_0\left|\right)}^2}}\×\frac{cU}{\left|Z_1+\frac{Z_2{Z}_0}{Z_2+Z_0}\right|}$

(3) two-phase phase fault,

$I_k^{\left(2\right)}=\sqrt{3}\×I_{k1}^{\left(2\right)}=\frac{3cL}{\left|Z_1+Z_2\right|}$

(4) single-phase grounding fault,

$I_k^{\left(1\right)}=3\×I_{k1}^{\left(1\right)}=\frac{\sqrt{3}cU}{\left|Z_1+Z_2+Z_0\right|}$

Wherein: Z ₁, Z ₂, Z ₀represent positive sequence, negative phase-sequence and zero sequence equivalent impedance respectively, with represent three-phase, alternate, two-phase and single-phase earthing fault electric current respectively, with represent forward-order current when three-phase, alternate, two-phase and single-phase short circuit respectively.

The present embodiment is from two aspects, Depth Priority Searching and equivalent Source Method is adopted to carry out simplify processes to short-circuit current calculation method, improve accuracy and the rapidity of calculating, meet the authenticity of power distribution network emulation, the requirement of real-time, better can give training dispatcher, reflect the scheduling decision ability of dispatcher more really.

Composition graphs 2, be described in detail the Training Simulation System of distribution network failure processing procedure of the present invention, it comprises: fault setup unit 1, for setting fault point; Fault current computing module 2, for calculating fault current; Trigger relaying protection judge module 3, whether be greater than protection definite value for failure judgement electric current, if it is trigger relaying protection action, otherwise protection definite value is reset; And protection definite value resets module 4, for resetting protection definite value.

In preferred embodiment, fault setting module 1 comprises: three-phase ground short-circuit unit 11, for setting three-phase ground short trouble; Two-phase grounding fault unit 12, for setting two-phase short circuit and ground fault; Two-phase phase fault unit 13, for setting two-phase phase fault; And single-line to ground fault unit 14, for setting single-phase node short trouble.Fault current computing module 2 comprises: fault type determining unit 21, for determining fault type; Fault current computing unit 22, for calculating fault current according to described fault type.Fault type determining unit 212 comprises further: fault location and search unit 211, for utilizing depth first method to search for outlet breaker, determines failure path; Equivalent impedance computing unit 212, for according to failure path, calculates the positive sequence equivalent impedance of failure path, negative phase-sequence equivalent impedance and zero sequence equivalent impedance.

Disclosed herein is only the preferred embodiments of the present invention, and this specification is chosen and specifically described these embodiments, and being to explain principle of the present invention and practical application better, is not limitation of the invention.The modifications and variations that any those skilled in the art do within the scope of specification, all should drop in scope that the present invention protects.

Claims (11)

1. a Simulated training method for distribution network failure processing procedure, is characterized in that, comprise the following steps:

S11: fault point and fault type are set;

S12: calculate fault current;

S13: the fault current calculated and the protection definite value preset are compared, judge whether described fault current is greater than described protection definite value, if it is triggers relaying protection action, if otherwise enter next step;

S14: reset protection definite value, enter step S11, so circulate.

2. the Simulated training method of distribution network failure processing procedure according to claim 1, is characterized in that, described step S12 comprises further:

S121: search outlet breaker, calculates the positive sequence equivalent impedance of failure path, negative phase-sequence equivalent impedance and zero sequence equivalent impedance;

S122: determine fault type, calculates fault current according to fault type.

3. the Simulated training method of distribution network failure processing procedure according to claim 2, it is characterized in that, described step S121 is further: utilize Depth Priority Searching to search for outlet breaker, calculate the positive sequence equivalent impedance of failure path, negative phase-sequence equivalent impedance and zero sequence equivalent impedance.

4. the Simulated training method of distribution network failure processing procedure according to claim 3, is characterized in that, described step S122 is further: utilize equivalent voltage source method to calculate fault current, the design conditions of described equivalent voltage source method comprise:

(1) positive sequence impedance is equal with negative sequence impedance;

(2) circuit has symmetry completely, not coupling between three sequence variablees;

(3) load current is disregarded;

(4) before fault, voltage is rated voltage.

5. the Simulated training method of distribution network failure processing procedure according to claim 4, is characterized in that, described fault type comprises:

Three-phase ground short trouble, its fault current is:

$I_K^{\left(3\right)}=I_{k1}^{\left(3\right)}=cU/\left(\sqrt{3}{Z}_1\right)$

Two-phase phase fault, its fault current is:

$I_k^{(1,1)}=\sqrt{3}\×\sqrt{1-\frac{\left|z_2{z}_0\right|}{{\left(\right|z_2+Z_0\left|\right)}^2}}\×I_{k1}^{(1,1)}=\sqrt{1-\frac{\left|Z_2{Z}_0\right|}{{\left(\right|Z_2+Z_0\left|\right)}^2}}\×\frac{cU}{\left|Z_1+\frac{Z_2{Z}_0}{Z_2+Z_0}\right|}$

Two-phase short circuit and ground fault, its fault current is:

$I_k^{\left(2\right)}=\sqrt{3}\×I_{k1}^{\left(2\right)}=\frac{3cU}{\left|Z_1+Z_2\right|}$

Single-phase grounding fault, its fault current is:

$I_k^{\left(1\right)}=3\×I_{k1}^{\left(1\right)}=\frac{\sqrt{3}cU}{\left|Z_1+Z_2+Z_0\right|};$

Wherein: Z ₁, Z ₂, Z ₀represent positive sequence, negative phase-sequence and zero sequence equivalent impedance respectively, with represent three-phase, alternate, two-phase and single-phase earthing fault electric current respectively, with represent forward-order current when three-phase, alternate, two-phase and single-phase short circuit respectively, fault point equivalent voltage source wherein U is rated voltage, and c is voltage coefficient.

6. a Training Simulation System for distribution network failure processing procedure, is characterized in that, comprising:

Fault setting module, for setting fault point and fault type;

Fault current computing module, for calculating fault current;

Trigger relaying protection judge module, for judging whether described fault current is greater than protection definite value, if it is triggering relaying protection action, carrying out follow-up Fault Isolation and failover procedure; Otherwise protection definite value is reset;

Protection definite value resets module, for resetting protection definite value.

7. the Training Simulation System of distribution network failure processing procedure according to claim 6, is characterized in that, described fault setting module comprises:

Three-phase ground short-circuit unit, for setting three-phase ground short trouble;

Two-phase grounding fault unit, for setting two-phase short circuit and ground fault;

Two-phase phase fault unit, for setting two-phase phase fault;

Single-line to ground fault unit, for setting single-phase grounding fault.

8. the Training Simulation System of distribution network failure processing procedure according to claim 7, is characterized in that, described fault current computing module comprises:

Fault type determining unit, for determining fault type;

Fault current computing unit, for calculating fault current according to described fault type.

9. the Training Simulation System of distribution network failure processing procedure according to claim 8, is characterized in that, described fault type determining unit comprises:

Fault location and search unit, for utilizing depth first method to search for outlet breaker, determine failure path;

Equivalent impedance computing unit, for according to failure path, calculates the positive sequence equivalent impedance of failure path, negative phase-sequence equivalent impedance and zero sequence equivalent impedance.

10. the Training Simulation System of distribution network failure processing procedure according to claim 8, is characterized in that, described fault current computing unit, calculates fault current for utilizing equivalent voltage source method;

The design conditions of described equivalent voltage source method are:

(1) positive sequence impedance is equal with negative sequence impedance;

(2) circuit has symmetry completely, not coupling between three sequence variablees;

(3) load current is disregarded;

(4) before fault, voltage is rated voltage.

The Training Simulation System of 11. distribution network failure processing procedures according to claim 10, is characterized in that, the fault current computing formula of described three-phase ground short trouble is:

$I_K^{\left(3\right)}=I_{k1}^{\left(3\right)}=cU/\left(\sqrt{3}{Z}_1\right)$

The fault current computing formula of described two-phase phase fault is:

$I_k^{(1,1)}=\sqrt{3}\×\sqrt{1-\frac{\left|z_2{z}_0\right|}{{\left(\right|z_2+Z_0\left|\right)}^2}}\×I_{k1}^{(1,1)}=\sqrt{1-\frac{\left|Z_2{Z}_0\right|}{{\left(\right|Z_2+Z_0\left|\right)}^2}}\×\frac{cU}{\left|Z_1+\frac{Z_2{Z}_0}{Z_2+Z_0}\right|}$

The fault current computing formula of described two-phase short circuit and ground fault is:

$I_k^{\left(2\right)}=\sqrt{3}\×I_{k1}^{\left(2\right)}=\frac{3cU}{\left|Z_1+Z_2\right|}$

The fault current computing formula of described single-phase grounding fault is:

$I_k^{\left(1\right)}=3\×I_{k1}^{\left(1\right)}=\frac{\sqrt{3}cU}{\left|Z_1+Z_2+Z_0\right|};$

Wherein: Z ₁, Z ₂, Z ₀represent positive sequence, negative phase-sequence and zero sequence equivalent impedance respectively, with represent three-phase, alternate, two-phase and single-phase earthing fault electric current respectively, with represent forward-order current when three-phase, alternate, two-phase and single-phase short circuit respectively, fault point equivalent voltage source wherein U is rated voltage, and c is voltage coefficient.