CN106646128B - Transient voltage disturbance source fault tolerance positioning method based on sliding mode control - Google Patents
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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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 DGFi"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 deltai(ii) a Constructing a control matrix C for sliding modalitiesswAnd 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 LiAs a result of the TVDS fault tolerant positioning.
Description
Technical field
The present invention relates to a kind of suitable for the Complicated Distribution Network containing distributed generation resource, the transient voltage based on sliding formwork control disturbs
Dynamic source fault-tolerance localization method, belongs to electrical engineering and power quality field.
Background technique
In recent years, with the increase of electricity marketization and power sensitive load, economic loss caused by power quality problem
It is increasing, current research hotspot both domestic and external is had become to causing the disturbing source of power quality problem to carry out positioning.Transient state electricity
Pressing disturbing source (Transient Voltage Disturbance Source, TVDS) is the important original for causing power quality problem
Cause is acquired disturbing signal, analyzes and is located by equipment for monitoring power quality (Power Quality Monitor, PQM)
Reason realizes intelligent diagnostics and the accurate positioning of TVDS, and then helps quickly to solve power quality problem and clearly defining responsibilities, has weight
Want meaning.Meanwhile the distributed generation resource (Distributed Generator, DG) based on new energy has been incorporated to power distribution network
As inexorable trend.However, node voltage, power flow and disturbing signal containing distributed power distribution network are grid-connected by DG
It influences, so that the accurate positioning of TVDS faces new problem.
Existing transient voltage fluctuation source localization method, there are the limitations that fault-tolerance is poor.Some of localization method mistakes
In the absolute reliability that the perturbation direction for relying on PQM differentiates, PQM erroneous judgement situation can not be handled；Although other localization method
Considering reliability problem and DG influences, but can not effectively solve " to handle energy drain in the case where disturbing source Location-Unknown
Problem ".Therefore, existing transient voltage fluctuation source localization method is difficult to meet the intelligence of disturbance event in Complicated Distribution Network containing DG
Diagnosis and accurate positioning demand.Currently, existing related ends be concentrated mainly on the disturbed depth of power quality, monitoring point configuration and
In terms of several researchs such as disturbance positioning: application No. is CN201510113962.2 to propose a kind of electricity based on incomplete S-transformation
Energy disturbed depth and localization method, it is fixed that CN201510223195.0 proposes a kind of power quality disturbance based on evidence theory
Position method, CN201610304497.5 propose a kind of voltage sag source localization method based on more evidence fusions,
CN201510701578.4 proposes a kind of fault-tolerant localization method of power quality disturbance based on improvement PSO algorithm,
CN201510313399.3 and CN2016100117639.X proposes a kind of side of distributing rationally of electric energy quality monitoring point respectively
Method.These correlative studys are not directed to solve energy drain problem using sliding formwork control, and then realize and be suitable for containing distributed electrical
The transient voltage fluctuation source localization method of source Complicated Distribution Network, and fault-tolerance with higher.
Summary of the invention
It is grid-connected by distributed generation resource DG that the present invention will overcome existing transient voltage fluctuation source localization method not solve effectively
Problem caused, that Complicated Distribution Network energy drain is sought under unknown disturbance situation, and then realize multiple containing distributed generation resource
The automatic and accurate positioning of transient voltage fluctuation source TVDS in miscellaneous power distribution network.It provides a kind of suitable for the distribution of complexity containing distributed generation resource
Transient voltage fluctuation source fault-tolerance localization method net, based on sliding formwork control, and error resilience performance with higher.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of transient voltage fluctuation source fault-tolerance suitable for the Complicated Distribution Network containing distributed generation resource, based on sliding formwork control
Localization method；The Complicated Distribution Network containing distributed generation resource refers to the distributed electrical under new energy and distributed generation technology background
Source access topology structure is more than the intelligent distribution network of ten nodes, and the sliding formwork control, which refers to have in Non-Linear Control Theory, to be slided
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
The temporarily disturbing source of drop and voltage swell.
Transient voltage fluctuation source fault-tolerance localization method of the present invention based on sliding formwork control, comprising the following steps:
1) define " diverter surface S " concept in the TVDS positioning based on sliding formwork control: diverter surface S is by l matrixThe set of composition；Subscript i indicates that integer variable, number l indicate identical as route numbers all in system；Its
InIndicate that by element value be ± 1 dimension discriminating direction matrix of m × 1 constituted, andMatrix R when meeting formula (1) operationl×1In
I-th of element value riEqual to m；WhereinThe structure set covering theory of expression l × m dimension, element value expression route and PQM's
Upstream-downstream relationship；
2) " the Belief state matrix X of PQM is definedn" concept: the Belief state matrix X that m × 1 is tieed upnIndicate sliding mode control process
In n-th state；The number of n expression state change；M expression identical dimension with PQM numbers all in system, including according to
Virtual state estimation obtains virtual PQM, keeps m value identical as l；XnM element valueRespectively indicate correspondence
The reliability of PQM, whereinAccording to the disturbance energy degree of strength that PQM is monitored come value,Value range be section [- 1 ,+1]
Interior real number, subscript i indicate integer variable；
3) " the energy drain Δ E of the Complicated Distribution Network containing DG is definedFi" related notion: define energy drain Δ EFiIt indicates to divide
Flow network NFiThe disturbance energy value of absorption；Wherein current-dividing network NFiIndicate the line between i-th of 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)Indicate DG and TVDS
Connection link；Use Bus(F_DG)It indicates in the bus being connected directly with TVDS, the bus of DG side direction；It is proposed that complexity containing DG is matched
The energy drain Δ E of power gridFiThe affecting laws differentiated with PQM perturbation direction: when TVDS is in Link(G-DG)On, and energy drain Δ
EFiGreater than from Bus(F_DG)When flowing to the energy of TVDS, the perturbation direction of i-th of PQM can be made to judge by accident；
4) the approach state process based on sliding formwork control；By Belief state matrix XnWith structure set covering theoryBy formula (2) into
Row matrix operation；
According to the matrix R of operation resultnMiddle greatest member value ri nSubscript i carry out approach state control, make Belief state square
The value of battle array is equal toAnd record ri nNumerical value as initial synthesis reliability；
5) sliding formwork estimation point F is setn；If the value of current Belief state matrixCorresponding route LiIt is located at
Link(G_DG), it is arranged from LiIt is current sliding formwork estimation point F along a nearest route of the direction main power source Gn, and enter step
6)；IfCorresponding route LiNot 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 separately by formula (3)
Positive divisor δi；
7) according to the energy drain correction factor δ of corresponding m PQMi, by the control matrix of formula (4) (5) building sliding mode
CswWith discriminant function J；
Csw=[δ1,…δi,…δm] (4)
8) when the value J of discriminant function is equal to m, show to have reached stable state, jump to step 9)；As the value J of discriminant function
When not equal to m, (n+1)th Belief state matrix X is updated by formula (6)n+1；
The X that will be obtained againn+1Substitution formula (7) carries out matrix operation；
Then according to gained Rn+1In greatest member value ri n+1Subscript i, make Xn+1It slides into next in diverter surfaceAnd updating comprehensive reliability is ri n+1；By Xn+1As new current Belief state matrix, return step 5) carry out sliding mode
Circulation；
9) it exports the Belief state matrix for being in stable state and its is correspondingWith comprehensive reliability；OutputIt is corresponding
Route LiAs TVDS fault-tolerance positioning result.
Beneficial effects of the present invention are mainly manifested in: 1, define based on sliding formwork control TVDS positioning in diverter surface,
Belief state matrix and energy drain concept；2, it proposes and solves energy drain problem with sliding formwork estimation point and sliding mode process
Method；3, transient voltage fluctuation source localization method suitable for the Complicated Distribution Network containing DG, based on sliding formwork control is realized, and
With preferable error resilience performance.
Detailed description of the invention
Fig. 1 is the specific implementation flow chart of the method for the present invention.
Fig. 2 is the 34 node Complicated Distribution Network topological diagram of IEEE containing DG.
Fig. 3 is the PQM reliability distribution map of four kinds of disturbance events.
Specific embodiment
Below with reference to examples and drawings, the present invention is described in further detail, but embodiments of the present invention are unlimited
In this.The general frame of TVDS positioning in embodiment based on sliding formwork control is as shown in Fig. 1, of the present invention to be based on sliding formwork
The transient voltage fluctuation source fault-tolerance localization method of control, comprising the following steps:
1) define " diverter surface S " concept in the TVDS positioning based on sliding formwork control: diverter surface S is by l matrixThe set of composition；Subscript i indicates that integer variable, number l indicate identical as route numbers all in system；Its
InIndicate that by element value be ± 1 dimension discriminating direction matrix of m × 1 constituted, andMatrix R when meeting formula (1) operationl×1In
I-th of element value riEqual to m；WhereinThe structure set covering theory of expression l × m dimension, element value expression route and PQM's
Upstream-downstream relationship；
2) " the Belief state matrix X of PQM is definedn" concept: the Belief state matrix X that m × 1 is tieed upnIndicate sliding mode control process
In n-th state；The number of n expression state change；M expression identical dimension with PQM numbers all in system, including according to
Virtual state estimation obtains virtual PQM, keeps m value identical as l；XnM element valueRespectively indicate correspondence
The reliability of PQM, whereinAccording to the disturbance energy degree of strength that PQM is monitored come value,Value range be section [- 1 ,+1]
Interior real number, subscript i indicate integer variable；
3) " the energy drain Δ E of the Complicated Distribution Network containing DG is definedFi" related notion: define energy drain Δ EFiIt indicates to divide
Flow network NFiThe disturbance energy value of absorption；Wherein current-dividing network NFiIndicate the line between i-th of 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)Indicate DG and TVDS
Connection link；Use Bus(F_DG)It indicates in the bus being connected directly with TVDS, the bus of DG side direction；It is proposed that complexity containing DG is matched
The energy drain Δ E of power gridFiThe affecting laws differentiated with PQM perturbation direction: when TVDS is in Link(G-DG)On, and energy drain Δ
EFiGreater than from Bus(F_DG)When flowing to the energy of TVDS, the perturbation direction of i-th of PQM can be made to judge by accident；
4) the approach state process based on sliding formwork control；By Belief state matrix XnWith structure set covering theoryBy formula (2) into
Row matrix operation；According to the matrix R of obtained operation resultnMiddle greatest member value ri nSubscript i carry out approach state control, make letter
The value of degree state matrix is equal toAnd record ri nNumerical value as initial synthesis reliability；
5) sliding formwork estimation point F is setn；If the value of current Belief state matrixCorresponding route LiIt is located at
Link(G_DG), it is arranged from LiIt is current sliding formwork estimation point F along a nearest route of the direction main power source Gn, and enter step
6)；IfCorresponding route LiNot 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 separately by formula (3)
Positive divisor δi；
7) according to the energy drain correction factor δ of corresponding m PQMi, by the control matrix of formula (4) (5) building sliding mode
CswWith discriminant function J；
8) when the value J of discriminant function is equal to m, show to have reached stable state, jump to step 9)；As the value J of discriminant function
When not equal to m, (n+1)th Belief state matrix X is updated by formula (6)n+1, the X that will obtainn+1Substitution formula (7) carries out matrix fortune
It calculates, according to gained Rn+1In greatest member value ri n+1Subscript i, make Xn+1It slides into next in diverter surfaceAnd it updates
Comprehensive reliability is ri n+1；By Xn+1As new current Belief state matrix, return step 5) carry out sliding mode circulation；
9) it exports the Belief state matrix for being in stable state and its is correspondingWith comprehensive reliability；OutputIt is corresponding
Route LiAs TVDS fault-tolerance positioning result.
The 34 node Complicated Distribution Network topological diagram of IEEE using shown in Fig. 2 containing DG further illustrates this as embodiment below
The operating process of invention；Rated power is that the new energy DG of 300kW is grid-connected in Bus 856, is emulated with MATLAB software modeling；?
In disturbance duration, white Gaussian noise is added in the disturbing signal that each PQM is monitored to simulate the error in real system
And interference, and the voltage Sag Disturbance event that four kinds of different disturbing causes and position are arranged is shown in Table 1, uses F respectively1、F2、F3And F4
Name.
Disturbance event setting temporarily drops in 1 four kinds of different voltages of table
The PQM reliability distribution of four kinds of disturbance events is as shown in figure 3, including the PQM of arrangement and being obtained by virtual state estimation
The PQM obtained.When various disturbance events occur, there is part monitoring point and perturbation direction differentiation occur in the presence of erroneous judgement situation.One
Aspect is that the direction due to caused by the energy drain problem of DG access Complicated Distribution Network is judged by accident；It on the other hand, is since part is supervised
The strength of turbulence of measuring point is relatively weak, has been superimposed direction erroneous judgement caused by the biggish white Gaussian noise of intensity interferes.Four kinds of disturbances
The details that perturbation direction erroneous judgement occurs in part monitoring point when event occurs are shown in Table 2.
Information is judged in direction by accident in 2 four kinds of disturbance events of table
According to system topology information, according to the step 1) of mentioned method, all routes in generation system are corresponding
MatrixSet, as diverter surface S；By constituting initial Belief state according to step 2) with PQM discriminating direction information
Matrix；Approach state operation is carried out according to step 4)；Pass through setting sliding formwork estimation point and sliding mode circulation behaviour according to step 5-8)
Make, solves energy drain problem；Finally export TVDS positioning result.Four kinds of different disturbance events are corresponding, are based on sliding formwork control
TVDS position fixing process in key message it is as shown in table 3.
The critical process information that table 3 is positioned based on the TVDS of sliding formwork control
Fault tolerance information shown in table 3 indicates: by the respective handling process of mentioned method, so that four different disturbance things
The corresponding each monitoring point perturbation direction erroneous judgement information of part is corrected.Wherein F1And F2In the presence of approach and two processes of sliding formwork；And F3
And F4After approach procedure, current state is not in Link(G_DG)On, it has been in stable state.By in table 3 positioning result and disturbance
Event position information compares, and four times position is consistent.Demonstrating proposed method can be suitably used for Complicated Distribution Network containing DG, and lead to
It crosses sliding formwork control to solve the problems, such as to seek energy drain under the specific location of unknown disturbance source, and then realizes TVDS's
It is accurately positioned.
As described above, the present invention can be better realized, above-described embodiment is only exemplary embodiments of the invention, is not used
Limit practical range of the invention, i.e., it is all according to equivalent changes and modifications made by the content of present invention, all wanted for right of the present invention
Range claimed is asked to be covered.
Claims (1)
1. the transient voltage fluctuation source fault-tolerance localization method based on sliding formwork control, comprising the following steps:
1) define " diverter surface S " concept in the transient voltage fluctuation source TVDS positioning based on sliding formwork control: diverter surface S is by l
A matrixThe set of composition；Subscript i indicates that integer variable, number l indicate and route number phases all in system
Together；WhereinIndicate that by element value be ± 1 dimension discriminating direction matrix of m × 1 constituted, andMatrix when meeting formula (1) operation
Rl×1In i-th of element value riEqual to m；WhereinIndicate l × m dimension structure set covering theory, element value indicate route with
The upstream-downstream relationship of equipment for monitoring power quality PQM；
2) " the Belief state matrix X of PQM is definedn" concept: the Belief state matrix X that m × 1 is tieed upnIt indicates in sliding mode control process
N-th state；The number of n expression state change；M indicates the identical dimension with PQM numbers all in system, including according to virtual
State estimation obtains virtual PQM, keeps m value identical as l；XnM element valueRespectively indicate corresponding PQM
Reliability, whereinAccording to the disturbance energy degree of strength that PQM is monitored come value,Value range be section [- 1 ,+1] in
Real number, subscript i indicate integer variable；
3) " the energy drain Δ E of the Complicated Distribution Network of DG containing distributed generation resource is definedFi" related notion: define energy drain Δ EFiTable
Show current-dividing network NFiThe disturbance energy value of absorption；Wherein current-dividing network NFiIt indicates between i-th of PQM and transient voltage fluctuation source
Route and its diverter branch；Use Link(G-DG)Expression DG couples link with system main power source G's；Use Link(F_DG)Indicate DG with
The connection link of TVDS；Use Bus(F_DG)It indicates in the bus being connected directly with TVDS, the bus of DG side direction；It proposes multiple containing DG
The energy drain Δ E of miscellaneous power distribution networkFiThe affecting laws differentiated with PQM perturbation direction: when TVDS is in Link(G-DG)On, and shunt energy
Measure Δ EFiGreater than from Bus(F_DG)When flowing to the energy of TVDS, the perturbation direction of i-th of PQM can be made to judge by accident；
4) the approach state process based on sliding formwork control；By Belief state matrix XnWith structure set covering theorySquare is carried out by formula (2)
Battle array operation；
According to the matrix R of operation resultnMiddle greatest member value ri nSubscript i carry out approach state control, make Belief state matrix
Value is equal toAnd record ri nNumerical value as initial synthesis reliability；
5) sliding formwork estimation point F is setn；If the value of current Belief state matrixCorresponding route LiPositioned at Link(G_DG)If
It sets from LiIt is current sliding formwork estimation point F along a nearest route of the direction main power source Gn, and enter step 6)；IfInstitute is right
Answer route LiNot 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 separately m energy drain correction because
Sub- δi；
7) according to the energy drain correction factor δ of corresponding m PQMi, by the control Matrix C of formula (4) (5) building sliding modeswWith
Discriminant function J；
Csw=[δ1,… δi,… δm] (4)
8) when the value J of discriminant function is equal to m, show to have reached stable state, jump to step 9)；When the value J of discriminant function is differed
When m, (n+1)th Belief state matrix X is updated by formula (6)n+1；
The X that will be obtained againn+1Substitution formula (7) carries out matrix operation；
Then according to gained Rn+1In greatest member value ri n+1Subscript i, make Xn+1It slides into next in diverter surfaceAnd
Updating comprehensive reliability is ri n+1；By Xn+1As new current Belief state matrix, return step 5) carry out following for sliding mode
Ring；
9) it exports the Belief state matrix for being in stable state and its is correspondingWith comprehensive reliability；OutputCorresponding route Li
As TVDS fault-tolerance positioning result.
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