CN106646128A - Transient voltage disturbance source fault tolerance positioning method based on sliding mode control - Google Patents

Abstract

The transient voltage disturbance source fault tolerance positioning method based on sliding mode control comprises the following steps: defining a switching surface S concept in transient voltage disturbance source TVDS positioning based on sliding mode control; defining a "confidence state matrix X for PQMⁿ"concept; defining 'shunt energy Delta E' of complex power distribution network containing distributed generation DG_Fi"related concepts; an approach state process based on sliding mode control; setting a sliding mode estimation point Fⁿ(ii) a Calculating m shunt energy correction factors_i(ii) a Constructing a control matrix C for sliding modalities^swAnd a decision function J; when the value J of the judgment function is equal to m, the steady state is reached, and the step 9) is skipped; when the value J of the judgment function is not equal to m, updating the confidence level state matrix X for the (n + 1) th time according to the formula (6)ⁿ⁺¹(ii) a Belief state matrices with outputs in steady state, and corresponding theretoAnd comprehensive credibility; output ofCorresponding line L_iAs a result of the TVDS fault tolerant positioning.

Description

Transient voltage fluctuation source fault-tolerance localization method based on sliding formwork control

Technical field

The present invention relates to it is a kind of suitable for it is containing distributed power source Complicated Distribution Network, disturbed based on the transient voltage of sliding formwork control Dynamic source fault-tolerance localization method, category electrical engineering and power quality field.

Background technology

In recent years, with the increase of electricity marketization and power sensitive load, the economic loss that power quality problem causes Increasing, the disturbing source to causing power quality problem is positioned become current study hotspot both domestic and external.Transient state electricity Pressure disturbing source (Transient Voltage Disturbance Source, TVDS) is the important original for causing power quality problem Cause, is acquired to disturbing signal, analyzes and is located by equipment for monitoring power quality (Power Quality Monitor, PQM) Reason, realizes the intelligent diagnostics of TVDS and is accurately positioned, and then helps quick solution power quality problem and clearly defining responsibilities, with weight Want meaning.Meanwhile, the distributed power source (Distributed Generator, DG) based on new forms of energy has been incorporated to power distribution network Become inexorable trend.However, the node voltage containing distributed power distribution network, power flow and disturbing signal are subject to DG grid-connected Affect so that being accurately positioned for TVDS faces a new difficult problem.

, there is the poor limitation of fault-tolerance in existing transient voltage fluctuation source localization method.Some of them localization method mistake In the absolute reliability that the perturbation direction for relying on PQM differentiates, it is impossible to process PQM erroneous judgement situations；Although other localization method Considering reliability problem and DG affects, but cannot effectively solving " energy drain is processed in the case of disturbing source Location-Unknown A difficult problem ".Therefore, existing transient voltage fluctuation source localization method is difficult to meet the intelligence of disturbance event in Complicated Distribution Network containing DG Diagnose and be accurately positioned demand.At present, existing related ends be concentrated mainly on the disturbed depth of the quality of power supply, monitoring point configuration and Several research aspects such as disturbance positioning：Application No. CN201510113962.2 proposes a kind of electricity based on incomplete S-transformation Energy disturbed depth and localization method, CN201510223195.0 proposes a kind of power quality disturbance based on evidence theory to be determined Position method, CN201610304497.5 proposes a kind of voltage sag source localization method based on many evidence fusions, CN201510701578.4 proposes a kind of fault-tolerant localization method of power quality disturbance based on improvement PSO algorithms, CN201510313399.3 and CN2016100117639.X propose respectively a kind of side of distributing rationally of electric energy quality monitoring point Method.These correlational studyes are not directed to solve an energy drain difficult problem using sliding formwork control, and then realize being applied to containing distributed electrical The transient voltage fluctuation source localization method of source Complicated Distribution Network, and with higher fault-tolerance.

The content of the invention

The present invention to overcome existing transient voltage fluctuation source localization method cannot effectively solving it is grid-connected by distributed power source DG A difficult problem for Complicated Distribution Network energy drain is asked under cause, unknown disturbance situation, and then is realized multiple containing distributed power source Transient voltage fluctuation source TVDS's is accurately positioned automatically in miscellaneous power distribution network.A kind of being applied to containing distributed power source complexity distribution is provided Transient voltage fluctuation source fault-tolerance localization method net, based on sliding formwork control, and with higher fault freedom.

The technical solution adopted for the present invention to solve the technical problems is：

It is a kind of suitable for containing distributed power source Complicated Distribution Network, transient voltage fluctuation source fault-tolerance based on sliding formwork control Localization method；The Complicated Distribution Network containing distributed power source refers to the distributed electrical under new forms of energy and distributed generation technology background Source access topology structure more than ten nodes intelligent distribution network, the sliding formwork control refer in Non-Linear Control Theory have slide The variable structure control method of dynamic model state, the transient voltage fluctuation source refer to belong to electrical energy power quality disturbance event, including voltage Disturbing source with voltage swell temporarily drops.

Transient voltage fluctuation source fault-tolerance localization method based on sliding formwork control of the present invention, comprises the following steps：

1) " diverter surface S " concept in TVDS positioning of the definition based on sliding formwork control：Diverter surface S is by l matrixThe set of composition；Subscript i represents integer variable, and number l represents identical with all circuit numbers in system；Its InRepresent that by element value be ± 1 m × 1 dimension discriminating direction matrix for constituting, andMatrix R when meeting formula (1) computing_l×1In I-th element value r_iEqual to m；WhereinThe structure set covering theory of l × m dimensions is represented, its element value represents circuit and PQM's Upstream-downstream relationship；

2) " the Belief state matrix X of PQM is definedⁿ" concept：The Belief state matrix X of m × 1 dimensionⁿRepresent sliding mode control process In n-th state；N represents the number of times of state change；M represents and all PQM numbers identical dimensions in system, including according to Virtual state is estimated to obtain virtual PQM, makes m values identical with l；XⁿM element valueCorrespondence is represented respectively The reliability of PQM, whereinThe disturbance energy degree of strength monitored according to PQM come value,Span be interval [- 1 ,+1] Interior real number, subscript i represents integer variable；

3) " energy drain Δ E of the definition containing DG Complicated Distribution Networks_Fi" related notion：Define energy drain Δ E_FiRepresent and divide Flow network N_FiThe disturbance energy value of absorption；Wherein current-dividing network N_FiRepresent the line between i-th PQM and transient voltage fluctuation source Road and its diverter branch；Use Link_(G-DG)Expression DG couples link with system main power source G's；Use Link_{(F_DG)}Represent DG and TVDS Connection link；Use Bus_{(F_DG)}In representing the bus being joined directly together with TVDS, DG sides to bus；Propose that complexity containing DG is matched somebody with somebody The energy drain Δ E of electrical network_FiThe affecting laws differentiated with PQM perturbation directions：When TVDS is in Link_(G-DG)On, and energy drain Δ E_FiMore than from Bus_{(F_DG)}When flowing to the energy of TVDS, the perturbation direction that can cause i-th PQM is judged by accident；

4) the convergence state process based on sliding formwork control；By Belief state matrix XⁿWith structure set covering theoryEnter by formula (2) Row matrix computing；

According to the matrix R of operation resultⁿMiddle greatest member value r_i ⁿSubscript i carry out convergence state control, make Belief state square The value of battle array is equal toAnd record r_i ⁿNumerical value as initial comprehensive reliability；

5) sliding formwork estimation point F is setⁿ；If the value of current Belief state matrixCorresponding circuit L_iIt is located at Link_{(G_DG)}, arrange from L_iIt is current sliding formwork estimation point F along a nearest circuit of main power source G directionsⁿ, and enter step 6)；IfCorresponding circuit L_iNot in Link_{(G_DG)}On, then jump to step 9)；

6) by sliding formwork estimation point FⁿAs the estimated location of current disturbing source, m energy drain school is calculated respectively by formula (3) Positive divisor δ_i；

7) according to the energy drain correction factor δ of m PQM of correspondence_i, by formula (4) (5) the control matrix of sliding mode is built C^swWith discriminant function J；

C^sw=[δ₁,…δ_i,…δ_m] (4)

8) when value J of discriminant function is equal to m, show to reach stable state, jump to step 9)；When value J of discriminant function When being not equal to m, by formula (6) the Belief state matrix X of (n+1)th time is updatedⁿ⁺¹；

Again by the X for obtainingⁿ⁺¹Substitution formula (7) carries out matrix operationss；

Then according to gained Rⁿ⁺¹In greatest member value r_i ⁿ⁺¹Subscript i, make Xⁿ⁺¹Slide into the next one in diverter surfaceAnd comprehensive reliability is updated for r_i ⁿ⁺¹；By Xⁿ⁺¹As new current Belief state matrix, return to step 5) carry out sliding mode Circulation；

9) Belief state matrix of the output in stable state, and its is correspondingWith comprehensive reliability；OutputIt is corresponding Circuit L_iAs TVDS fault-tolerance positioning results.

Beneficial effects of the present invention are mainly manifested in：1st, define based on sliding formwork control TVDS positioning in diverter surface, Belief state matrix and energy drain concept；2nd, propose and solve an energy drain difficult problem with sliding formwork estimation point and sliding mode process Method；3rd, realize suitable for transient voltage fluctuation source localization method containing DG Complicated Distribution Networks, based on sliding formwork control, and With preferable fault freedom.

Description of the drawings

Fig. 1 is embodied as flow chart for the inventive method.

Fig. 2 is the node Complicated Distribution Network topological diagrams of IEEE 34 containing DG.

Fig. 3 is the PQM reliability scattergrams of four kinds of disturbance events.

Specific embodiment

With reference to embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited In this.The general frame that TVDS in embodiment based on sliding formwork control is positioned is as shown in Figure 1, of the present invention based on sliding formwork The transient voltage fluctuation source fault-tolerance localization method of control, comprises the following steps：

1) " diverter surface S " concept in TVDS positioning of the definition based on sliding formwork control：Diverter surface S is by l matrixThe set of composition；Subscript i represents integer variable, and number l represents identical with all circuit numbers in system；Its InRepresent that by element value be ± 1 m × 1 dimension discriminating direction matrix for constituting, andMatrix R when meeting formula (1) computing_l×1In I-th element value r_iEqual to m；WhereinThe structure set covering theory of l × m dimensions is represented, its element value represents circuit and PQM's Upstream-downstream relationship；

2) " the Belief state matrix X of PQM is definedⁿ" concept：The Belief state matrix X of m × 1 dimensionⁿRepresent sliding mode control process In n-th state；N represents the number of times of state change；M represents and all PQM numbers identical dimensions in system, including according to Virtual state is estimated to obtain virtual PQM, makes m values identical with l；XⁿM element valueCorrespondence is represented respectively The reliability of PQM, whereinThe disturbance energy degree of strength monitored according to PQM come value,Span be interval [- 1 ,+1] Interior real number, subscript i represents integer variable；

3) " energy drain Δ E of the definition containing DG Complicated Distribution Networks_Fi" related notion：Define energy drain Δ E_FiRepresent and divide Flow network N_FiThe disturbance energy value of absorption；Wherein current-dividing network N_FiRepresent the line between i-th PQM and transient voltage fluctuation source Road and its diverter branch；Use Link_(G-DG)Expression DG couples link with system main power source G's；Use Link_{(F_DG)}Represent DG and TVDS Connection link；Use Bus_{(F_DG)}In representing the bus being joined directly together with TVDS, DG sides to bus；Propose that complexity containing DG is matched somebody with somebody The energy drain Δ E of electrical network_FiThe affecting laws differentiated with PQM perturbation directions：When TVDS is in Link_(G-DG)On, and energy drain Δ E_FiMore than from Bus_{(F_DG)}When flowing to the energy of TVDS, the perturbation direction that can cause i-th PQM is judged by accident；

4) the convergence state process based on sliding formwork control；By Belief state matrix XⁿWith structure set covering theoryEnter by formula (2) Row matrix computing；According to the matrix R of the operation result for obtainingⁿMiddle greatest member value r_i ⁿSubscript i carry out convergence state control, make letter The value of degree state matrix is equal toAnd record r_i ⁿNumerical value as initial comprehensive reliability；

5) sliding formwork estimation point F is setⁿ；If the value of current Belief state matrixCorresponding circuit L_iIt is located at Link_{(G_DG)}, arrange from L_iIt is current sliding formwork estimation point F along a nearest circuit of main power source G directionsⁿ, and enter step 6)；IfCorresponding circuit L_iNot in Link_{(G_DG)}On, then jump to step 9)；

6) by sliding formwork estimation point FⁿAs the estimated location of current disturbing source, m energy drain school is calculated respectively by formula (3) Positive divisor δ_i；

7) according to the energy drain correction factor δ of m PQM of correspondence_i, by formula (4) (5) the control matrix of sliding mode is built C^swWith discriminant function J；

8) when value J of discriminant function is equal to m, show to reach stable state, jump to step 9)；When value J of discriminant function When being not equal to m, by formula (6) the Belief state matrix X of (n+1)th time is updatedⁿ⁺¹, by the X for obtainingⁿ⁺¹Substitution formula (7) enters row matrix fortune Calculate, according to gained Rⁿ⁺¹In greatest member value r_i ⁿ⁺¹Subscript i, make Xⁿ⁺¹Slide into the next one in diverter surfaceAnd update Comprehensive reliability is r_i ⁿ⁺¹；By Xⁿ⁺¹As new current Belief state matrix, return to step 5) carry out the circulation of sliding mode；

9) Belief state matrix of the output in stable state, and its is correspondingWith comprehensive reliability；OutputIt is corresponding Circuit L_iAs TVDS fault-tolerance positioning results.

Below with the node Complicated Distribution Network topological diagrams of IEEE 34 containing DG shown in Fig. 2 as embodiment, this is further illustrated The operating process of invention；Rated power is grid-connected in Bus 856 for the new forms of energy DG of 300kW, is emulated with MATLAB software modelings； Error in disturbance duration, during white Gaussian noise is added in the disturbing signal that each PQM is monitored to simulate real system And interference, and the voltage Sag Disturbance event of four kinds of different disturbing causes and position is set is shown in Table 1, F is used respectively₁、F₂、F₃And F₄ Name.

The different voltage Sag Disturbance events of 1 four kinds of table are arranged

The PQM reliabilities distribution of four kinds of disturbance events including the PQM for arranging and by virtual state as shown in figure 3, estimate to obtain The PQM for obtaining.When various disturbance events occur, exist part monitoring point occur perturbation direction differentiate there is erroneous judgement situation.One Aspect, is the direction erroneous judgement caused due to the energy drain problem that DG accesses Complicated Distribution Network；On the other hand, it is because part is supervised The strength of turbulence of measuring point is relatively weak, has been superimposed the direction erroneous judgement that the larger white Gaussian noise interference of intensity causes.Four kinds of disturbances The details that perturbation direction erroneous judgement occurs in part monitoring point when event occurs are shown in Table 2.

Erroneous judgement information in direction in 2 four kinds of disturbance events of table

According to system topology information, according to the step of institute's extracting method 1), all circuits in generation system are corresponding MatrixSet, as diverter surface S；By with PQM discriminating direction information, according to step 2) constitute initial Belief state Matrix；According to step 4) carry out convergence state operation；According to step 5-8) by arranging sliding formwork estimation point and sliding mode circulation behaviour Make, solve an energy drain difficult problem；Finally export TVDS positioning results.Four kinds of different disturbance events are corresponding, based on sliding formwork control TVDS position fixing processs in key message it is as shown in table 3.

The critical process information that TVDS of the table 3 based on sliding formwork control is positioned

Fault tolerance information shown in table 3 is represented：By the respective handling process of institute's extracting method so that four different disturbance things The corresponding each monitoring point perturbation direction erroneous judgement information of part is corrected.Wherein F₁And F₂There are two processes of convergence and sliding formwork；And F₃ And F₄After approach procedure terminates, current state is not in Link_{(G_DG)}On, in stable state.By the positioning result in table 3 and disturbance Event position information is contrasted, and four times position is consistent.Demonstrate institute's extracting method and can be suitably used for Complicated Distribution Network containing DG, and lead to Cross sliding formwork control and efficiently solve and a difficult problem for energy drain is asked under the particular location of unknown disturbance source, and then realize TVDS's It is accurately positioned.

As described above, just can preferably realize the present invention, above-described embodiment is only the exemplary embodiments of the present invention, is not used To limit the practical range of the present invention, i.e., all impartial changes made according to present invention and modification, all will for right of the present invention Scope required for protection is asked to be covered.

Claims (1)

1. the transient voltage fluctuation source fault-tolerance localization method based on sliding formwork control, comprises the following steps：

1) " diverter surface S " concept in transient voltage fluctuation source TVDS positioning of the definition based on sliding formwork control：Diverter surface S is by l Individual matrixThe set of composition；Subscript i represents integer variable, and number l is represented and all circuit number phases in system Together；WhereinRepresent that by element value be ± 1 m × 1 dimension discriminating direction matrix for constituting, andMatrix when meeting formula (1) computing R_l×1In i-th element value r_iEqual to m；WhereinRepresent l × m dimension structure set covering theory, its element value represent circuit with The upstream-downstream relationship of equipment for monitoring power quality PQM；

$R_{l\×1}=C_{l\×m}^{\mathrm{cov}}{D}_{Li}^{sw}---\left(1\right)$

2) " the Belief state matrix X of PQM is definedⁿ" concept：The Belief state matrix X of m × 1 dimensionⁿIn representing sliding mode control process N-th state；N represents the number of times of state change；M is represented and all PQM numbers identical dimensions in system, including according to virtual State estimation obtains virtual PQM, makes m values identical with l；XⁿM element valueCorrespondence PQM is represented respectively Reliability, whereinThe disturbance energy degree of strength monitored according to PQM come value,Span in interval [- 1 ,+1] Real number, subscript i represents integer variable；

3) " the energy drain Δ E of the Complicated Distribution Networks of DG containing distributed power source is defined_Fi" related notion：Define energy drain Δ E_FiTable Show current-dividing network N_FiThe disturbance energy value of absorption；Wherein current-dividing network N_FiRepresent between i-th PQM and transient voltage fluctuation source Circuit and its diverter branch；Use Link_(G-DG)Expression DG couples link with system main power source G's；Use Link_{(F_DG)}Represent DG with The connection link of TVDS；Use Bus_{(F_DG)}In representing the bus being joined directly together with TVDS, DG sides to bus；Propose multiple containing DG The energy drain Δ E of miscellaneous power distribution network_FiThe affecting laws differentiated with PQM perturbation directions：When TVDS is in Link_(G-DG)On, and shunt energy Amount Δ E_FiMore than from Bus_{(F_DG)}When flowing to the energy of TVDS, the perturbation direction that can cause i-th PQM is judged by accident；

4) the convergence state process based on sliding formwork control；By Belief state matrix XⁿWith structure set covering theorySquare is carried out by formula (2) Battle array computing；

$R^n=C_{l\×m}^{\mathrm{cov}}{X}^n---\left(2\right)$

According to the matrix R of operation resultⁿMiddle greatest member value r_i ⁿSubscript i carry out convergence state control, make Belief state matrix Value is equal toAnd record r_i ⁿNumerical value as initial comprehensive reliability；

5) sliding formwork estimation point F is setⁿ；If the value of current Belief state matrixCorresponding circuit L_iPositioned at Link_{(G_DG)}If, Put from L_iIt is current sliding formwork estimation point F along a nearest circuit of main power source G directionsⁿ, and into step 6)；IfInstitute is right Answer circuit L_iNot in Link_{(G_DG)}On, then jump to step 9)；

6) by sliding formwork estimation point FⁿAs the estimated location of current disturbing source, by formula (3) calculate respectively m energy drain correction because Sub- δ_i；

7) according to the energy drain correction factor δ of m PQM of correspondence_i, by formula (4) (5) the control Matrix C of sliding mode is built^swWith Discriminant function J；

C^sw=[δ₁,… δ_i,… δ_m] (4)

$J=\[\begin{array}{ccccc}{\mathrm{\δ}}_1,& ...& {\mathrm{\δ}}_i,& ...& {\mathrm{\δ}}_m\end{array}\]\×{\[1,...,1\]}_{1\×m}^T---\left(5\right)$

8) when value J of discriminant function is equal to m, show to reach stable state, jump to step 9)；When value J of discriminant function When m, by formula (6) the Belief state matrix X of (n+1)th time is updatedⁿ⁺¹；

$X^{n+1}={\left[\begin{array}{ccccc}{\mathrm{\δ}}_1{x}_1^n,& ...& {\mathrm{\δ}}_j{x}_j^n,& ...& {\mathrm{\δ}}_m{x}_m^n\end{array}\right]}^T---\left(6\right)$

Again by the X for obtainingⁿ⁺¹Substitution formula (7) carries out matrix operationss；

$R^{n+1}=C_{l\×m}^{\mathrm{cov}}\·X^{n+1}---\left(7\right)$

Then according to gained Rⁿ⁺¹In greatest member value r_i ⁿ⁺¹Subscript i, make Xⁿ⁺¹Slide into the next one in diverter surface And comprehensive reliability is updated for r_i ⁿ⁺¹；By Xⁿ⁺¹As new current Belief state matrix, return to step 5) carry out following for sliding mode Ring；

9) Belief state matrix of the output in stable state, and its is correspondingWith comprehensive reliability；OutputCorresponding circuit L_iAs TVDS fault-tolerance positioning results.