CN108206541A - A kind of distribution network electric energy quality disturbance source locating method containing distributed generation resource - Google Patents
A kind of distribution network electric energy quality disturbance source locating method containing distributed generation resource Download PDFInfo
- Publication number
- CN108206541A CN108206541A CN201810091638.9A CN201810091638A CN108206541A CN 108206541 A CN108206541 A CN 108206541A CN 201810091638 A CN201810091638 A CN 201810091638A CN 108206541 A CN108206541 A CN 108206541A
- Authority
- CN
- China
- Prior art keywords
- disturbance
- monitoring point
- power
- electric energy
- source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
-
- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention relates to a kind of distribution network electric energy quality disturbance source locating methods containing distributed generation resource, the perturbation direction monitored according to electric energy quality monitor, the power quality disturbance position containing distributed generation resource is solved using genetic algorithm, so as to be positioned to disturbing source.The influence that the present invention considers distributed generation resource caused by power distribution network operational process, in view of the monitoring error of electric energy quality monitor, meet the power quality disturbance optimal location of monitoring state using genetic algorithm to acquire, serious forgiveness and the accuracy of power quality disturbance positioning are improved, solves the problems, such as that existing disturbance source locating mode error is big, accuracy rate is low.
Description
Technical field
The present invention relates to the positioning of disturbing source, and in particular to a kind of distribution network electric energy quality disturbing source containing distributed generation resource
Localization method.
Background technology
Mainstay industry of the electric system as modern industrial society, main purpose are safe efficient and reliably
Meet requirement of the user to electric power.With the innovation of science and technology, the application of power electronic equipment is more and more extensive, particularly respectively
The capacity continuous development of class impact load, nonlinear-load, has seriously affected electric power quality.
Electric energy is substantially a kind of commodity, provides the natural responsibility that high quality of products is electric system.Either power generation side,
Supplier of electricity or electricity consumption side all extremely pay close attention to power quality problem.Power quality problem seriously endangers power grid and national warp
The safe efficient operation of Ji, and influence product quality and the daily quality of life of user.On the one hand, electric energy inferior will make
Supplier of electricity cannot smoothly complete the power supply to electricity consumption side, and certain economic loss can be caused to supplier of electricity, influence power grid peace
Complete and supplier of electricity prestige；On the other hand, electric energy inferior will cause some electricity consumption sides huge economic loss.
Power quality disturbance position, mainly include two big contents, when disturbing source direction determining, i.e. disturbing source relative to
The direction of monitoring point is usually represented with upstream and downstream；First, disturbance source locating, disturbance source locating is sentenced based on disturbing source direction
It is fixed, disturbing source is positioned using the result of disturbing source direction determining.In recent years, distributed generation resource has obtained rapidly in China
Development.These novel power supplies are made that tremendous contribution, but simultaneously to alleviate power tense, improving energy resource structure, grid-connected also to give
Conventional electric power system optimization control brings the problem of new and challenge.Distributed generation resource access distribution system after, electric network composition and
Huge change will all occur for operation control method, and power grid becomes more electric source modes from simplex power mode, the position of distributed generation resource,
Capacity and the method for operation will all produce bigger effect the Line Flow, node voltage, via net loss of power grid.Distributed generation resource
Appearance, on the one hand so that power quality problem it is more serious, on the other hand its indefinite direction of tide, seriously affected disturbance
Source direction determining so that power quality disturbance positioning becomes more difficult.
Only power quality disturbance is accurately positioned, can just adopt an effective measure elimination or mitigation disturbing influence.
For for for electricity consumption both sides, the acceptable clear and definite both sides' responsibility of power quality disturbance positioning differentiates that disturbance is by electric system
It is caused or as caused by user, as coordinate between power department and user under Power Market dispute it is important according to
According to.Power quality disturbance positioning formulates utility power quality control strategy to power department also has important guiding effect.Containing distribution
The distribution network electric energy quality disturbance source locating research of power supply has important theory and realistic meaning.
Invention content
The object of the present invention is to provide a kind of distribution network electric energy quality disturbance source locating methods containing distributed generation resource, realize
The accurate positionin of power quality disturbance improves serious forgiveness and the accuracy of power quality disturbance positioning, existing to solve
The problem of some disturbance source locating mode errors are big, accuracy rate is low.
To achieve the above object, the scheme of the invention is：A kind of distribution network electric energy quality disturbing source containing distributed generation resource
Localization method, step are as follows：
(1) electric energy quality monitor at the monitoring point of each circuit of power distribution network is set, and obtains electric energy quality monitor
The voltage and current signal acquired at each monitoring point；
(2) high fdrequency component of the voltage and current signal is extracted, calculates high frequency components energy, judges that each monitoring point corresponds to
Perturbation direction；
(3) distribution network electric energy quality disturbance source locating model, inclusive fitness function, monitoring function and disturbance power are established
Weight；
(4) to each circuit operating status coding in power distribution network, determine that each electric energy quality monitoring point is disturbed according to monitoring function
The desired value of dynamic directional information；
(5) the perturbation direction information of each monitoring point is encoded, determines the monitoring state of each monitoring point；
(6) according to the corresponding high frequency components energy in monitoring point each at the end of disturbance, the corresponding disturbance of each monitoring state is asked for
Weight；
(7) result of calculation of step (4)-(6) is substituted into fitness function, optimal solution is sought using genetic algorithm, completed
The positioning of disturbing source.
Further, distribution network electric energy quality disturbance source locating method according to the present invention, in the step (3),
Distribution network electric energy quality disturbance source locating model is：
Fitness function：
Monitor function：
Disturb weight：
Wherein：nrFor monitoring point number；
S is circuit operating status vector, and dimension n is determined by the number of circuit；
rkMonitoring state for k-th of monitoring point；
For the expectation value function of k-th of monitoring point perturbation direction information, function is referred to as monitored；
AkRepresent the disturbance weight of the monitoring state of k-th of monitoring point；
siOperating status for monitoring point k upstreams i-th line road；
sjOperating status for monitoring point k downstreams j-th strip circuit；
EdkThe high frequency components energy for being k-th of monitoring point at the end of disturbance.
Further, distribution network electric energy quality disturbance source locating method according to the present invention, in the step (4),
The coding mode of each circuit operating status is：The corresponding circuit operating status of circuit for having disturbing source represents with 1, unperturbed
The corresponding circuit operating status of circuit in dynamic source is represented with 0.
Further, distribution network electric energy quality disturbance source locating method according to the present invention, in the step (5),
The coding mode of perturbation direction information is：When perturbation direction to be preceding to during disturbance, be encoded to 1, at this time the monitoring of monitoring point
State is represented with 1；When perturbation direction is backward disturbance, 0 is encoded to, the monitoring state of monitoring point is i.e. with 0 table at this time
Show.
Further, distribution network electric energy quality disturbance source locating method according to the present invention, in the step (7),
Use genetic algorithm seek the process of optimal solution for：
Step 5.1, it determines the position of electric energy quality monitor, circuit operating status is encoded to form genetic algorithm
Primary population needed for operation, while evolutionary generation counter g=0 and maximum evolutionary generation G is set.
Step 5.2, according to the fitness function of foundation, the fitness of each individual in population is calculated, and selects fitness
Highest individual is optimal solution.
Step 5.3, optimal solution is updated, evolutionary generation counter adds 1, if g<G, then population is by selection, intersection, variation fortune
Next-generation population is obtained after calculating, retains the highest individual of fitness in population, return to step 5.2；
If g=G, the globally optimal solution recorded at this time is the last solution of power quality disturbance positioning, determines disturbing source
Position.
Further, distribution network electric energy quality disturbance source locating method according to the present invention, the disturbing source direction
Determination method be：
Step 6.1, disturbance information is acquired, judges the disturbance type of disturbing source；
Step 6.2, collected electric current and voltage signal decomposed using wavelet transform, reconstructed, extract institute
State the high fdrequency component of the voltage and current signal at monitoring point；
Step 6.3, Power arithmetic is carried out to the high fdrequency component of the electric current at the monitoring point and voltage signal, obtains high frequency
Power of disturbance, and high frequency components power is integrated, obtain high frequency components energy；
Step 6.4, according to the positive and negative judgement disturbing source of high frequency components energy relative to the position of monitoring point, and according to disturbance
Type determines disturbing source direction.
Further, distribution network electric energy quality disturbance source locating method according to the present invention, in the step 6.1,
If disturbance occurs, voltage when voltage at disturbance is than stable state is low, then it is the disturbance type to absorb energy to judge disturbing source；If
When disturbance occurs, voltage when voltage at disturbance is than stable state is high, then judges disturbance type of the disturbing source for Implantation Energy.
Further, distribution network electric energy quality disturbance source locating method according to the present invention, in the step 6.4,
For the disturbance type to absorb energy, if the instantaneous power after disturbance occurs is less than steady state power, illustrate that disturbance energy is subtracting
Weak, disturbance energy is negative, and disturbing source is located at the upstream of monitoring point, and judgement perturbation direction is backward disturbance；After if disturbance occurs
Instantaneous power is more than steady state power, then illustrates that disturbance energy is enhancing, and disturbance energy is just, disturbing source is located under monitoring point
Trip, judgement perturbation direction is to be preceding to disturbance；
For the disturbance type of Implantation Energy, if the instantaneous power after disturbance occurs is less than steady state power, illustrate to disturb
Energy is weakening, and disturbance energy is negative, and disturbing source is located at the downstream of monitoring point, and judgement perturbation direction is to be preceding to disturbance；If disturbance
Instantaneous power after generation is more than steady state power, then illustrates that disturbance energy is enhancing, and disturbance energy is just, disturbing source is located at monitoring
The upstream of point, judgement perturbation direction are backward disturbance.
Further, distribution network electric energy quality disturbance source locating method according to the present invention, in the step 6.3,
The calculating of high frequency components power is as follows：
pd=uAdiAd+uBdiBd+uCdiCd
Wherein, pdFor high frequency components power；
uAd、uBd、uCdThe high fdrequency component of three-phase voltage when occurring for disturbance；
iAd、iBd、iCdThe high fdrequency component of three-phase current when occurring for disturbance.
Further, distribution network electric energy quality disturbance source locating method according to the present invention, in the step 6.3,
The calculating of high frequency components energy is as follows：
High frequency components power is integrated, that is, obtains high frequency components energy, i.e.,：
Ed=∫ pddt
Wherein, EdFor high frequency components energy.
The advantageous effect that the present invention reaches：Compared with traditional power quality disturbance localization method, the present invention considers point
Influence of the cloth power supply caused by power distribution network operational process, while in view of the monitoring error of electric energy quality monitor, adopt
The power quality disturbance optimal location for meeting monitoring state is acquired with genetic algorithm, realizes the accurate fixed of power quality disturbance
Position improves serious forgiveness and the accuracy of power quality disturbance positioning, meanwhile, the present invention can fast and accurately judge electric energy
The power supply reliability of power distribution network is improved in quality disturbance source position.
The present invention is decomposed and is reconstructed to the disturbing signal being collected by wavelet transform, to high fdrequency component into
Row power energy calculates, and further calculates high frequency components energy, and according to the positive negative judgement disturbing source phase of high frequency components energy
For the direction of monitoring point, reduce other interference of disturbing signal, the accuracy of perturbation direction judgement is improved, thus into one
Step improves the accuracy of disturbance source locating.
Description of the drawings
Fig. 1 is disturbing source monitoring principle figure；
Fig. 2 is flow chart of the method for the present invention；
Fig. 3 is the flow direction schematic diagram of high frequency components energy of the present invention；
Fig. 4 is M9 disturbance energies monitoring figure in application example of the present invention；
Fig. 5 is M9_1 disturbance energies monitoring figure in application example of the present invention；
Fig. 6 is M5 disturbance energies monitoring figure in application example of the present invention；
Fig. 7 is M8 disturbance energies monitoring figure in application example of the present invention.
Specific embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
Power quality disturbance positioning is judgement result based on perturbation direction to carry out, and perturbation direction judges, that is, disturbs
Dynamic source is usually represented relative to the direction of monitoring point with upstream and downstream.
The judgement of perturbation direction：
As shown in Figure 1, be generally fitted with electric energy quality monitor on the important branch road of power grid, for collection voltages,
The parameters such as electric current, frequency, according to monitor voltage, current data, can obtain flowing through the three-phase instantaneous power of monitoring point, when being
When system is in stable state, three-phase instantaneous power is certain value；When disturbing generation, three-phase instantaneous power can change.
Perturbation direction, that is, disturbing source are happened at prison relative to monitoring point (installation site of electric energy quality monitor)
The disturbance of measuring point upstream is backward disturbance, and the disturbance for being happened at monitoring point downstream is preceding to disturbance.As shown in Figure 1, arrow direction
It represents the practical flow direction of steady state power, when being disturbed at F in figure, disturbs and be happened at down for the M1 of monitoring point
Trip, to disturbance before belonging to；Upstream is happened at for the M2 of monitoring point, belongs to backward disturbance.
The determination method of perturbation direction of the present invention is：
Step a, acquisition disturbance information (including the voltage at disturbance, the voltage and current at electric current and monitoring point), sentences
Surely type is disturbed.
The process occurred is disturbed for law of conservation of energy, is exactly the flowing of energy, can consider in terms of two,
One, disturbing source is the disturbance type to absorb energy, such as short circuit；Second, disturbing source is the disturbance type of Implantation Energy, such as thunder
It hits.For the disturbance type to absorb energy, system releases energy outward at disturbance, when the voltage at general disturbance can be than stable state
Voltage it is low；Extraneous to system Implantation Energy for the disturbance type of Implantation Energy, the voltage at disturbance can compare steady state voltage
It is high.According to this principle, the height of voltage absorbs energy determining disturbance type or Implantation Energy during by judging to disturb.
Step b decomposes the electric current at monitoring point and voltage signal using wavelet transform, is reconstructed, extraction prison
The high fdrequency component of voltage and current signal at measuring point.
When all kinds of transient power quality disturbances occur in system, the high fdrequency component that many frequencies are higher than power frequency can be generated,
These high fdrequency components include abundant disturbance information.As shown in Fig. 2, high fdrequency component is sent out by disturbing source position, and to circuit two
End is propagated, this is equivalent to be superimposed a power supply in disturbance source position, and road direction both ends convey high frequency along the disturbance superposition source
Energy.
Step c calculates high frequency components power and high frequency components energy.
When system disturbs, the difference of instantaneous power when instantaneous power and system at monitoring point are stablized is disturbance work(
Rate, the integration of power of disturbance is disturbance energy.When system is stablized, instantaneous power is approximately constant, and therefore, power of disturbance value always connects
Nearly 0；When system disturbs, instantaneous power changes, and power of disturbance is no longer 0 with disturbance energy.
Three-phase instantaneous power is represented by the three-phase instantaneous power of stable state and folding for the three-phase instantaneous power of disturbance during disturbance
Add.The three-phase instantaneous voltage of system is respectively UA、UB、UC, three-phase transient current is respectively iA、iB、iC, then three-phase instantaneous power p
It is represented by：
P=uAiA+uBiB+uCiC
When disturbing generation, each phase voltage and electric current are all represented by the low frequency component based on power frequency (with subscript a tables
The sum of show) and high fdrequency component (being represented with subscript d), so, three-phase instantaneous power p can be further represented as：
P=(uAa+uAd)(iAa+iAd)+(uBa+uBd)(iBa+iBd)+(uCa+uCd)(iCa+iCd)
=(uAaiAa+uBaiBa+uCaiCa)
+(uAdiAd+uBdiBd+uCdiCd)
+(upAaiAd+uBaiBd+uCaiCd+uAdiAa+uBdiBa+uCdiCa)
=pa+pd+pm
Wherein, paReferred to as three-phase stable state instantaneous power, pdReferred to as high frequency components power, pmReferred to as hybrid perturbation power.To height
Frequency power of disturbance pdIt is integrated, you can obtain high frequency components ENERGY Ed, i.e.,：
Ed=∫ pddt
When high frequency components ENERGY EdFor timing, illustrate disturbing source the upstream of monitoring point (close to system power supply side)；Instead
It, then illustrate disturbing source the downstream of monitoring point (far from system power supply side).
Step d determines position of the disturbing source relative to monitoring point, judges perturbation direction.
Disturbance moment occurs, system can be regarded as Linear Network, by principle of stacking it is found that system components voltage and electricity
Stream is generated by system power supply and disturbance superposition source collective effect.The high fdrequency component of voltage and current be remove system power supply when by
The component that superposition source independent role generates is disturbed, therefore, high frequency components energy is the equal of to be injected from disturbance superposition source to system
Energy, and along the line road direction both ends propagate.
As shown in Fig. 2, when F points disturb, the flow direction of high frequency components energy.According to the flow direction of high-frequency energy, you can
To judge position of the disturbing source relative to monitoring point：
For the disturbance type to absorb energy, if the instantaneous power after disturbance occurs is less than steady state power, illustrate to disturb
Energy is weakening, and disturbance energy is negative, and disturbing source is located at the upstream of monitoring point, and judgement perturbation direction is backward disturbance；If disturbance
Instantaneous power after generation is more than steady state power, then illustrates that disturbance energy is enhancing, and disturbance energy is just, disturbing source is located at monitoring
The downstream of point, judgement perturbation direction is to be preceding to disturbance；
For the disturbance type of Implantation Energy, if the instantaneous power after disturbance occurs is less than steady state power, illustrate to disturb
Energy is weakening, and disturbance energy is negative, and disturbing source is located at the downstream of monitoring point, and judgement perturbation direction is to be preceding to disturbance；If disturbance
Instantaneous power after generation is more than steady state power, then illustrates that disturbance energy is enhancing, and disturbance energy is just, disturbing source is located at monitoring
The upstream of point, judgement perturbation direction are backward disturbance.
The positioning of disturbing source：
The influence that the present invention considers distributed generation resource caused by power distribution network operational process, it is contemplated that power quality is supervised
The monitoring error of instrument is surveyed, acquires power quality disturbance optimal location using genetic algorithm, the present invention is using genetic algorithm
Disturbance source locating can guarantee in the case where perturbation direction erroneous judgement occurs in electric energy quality monitor, quickly and accurately judge to disturb
The position in source improves serious forgiveness and the accuracy of power quality disturbance positioning.
The model that power quality disturbance positioning is carried out using genetic algorithm that the present invention establishes is as follows：
(1) fitness function
Fitness function can reflect the relationship between circuit operating status and monitoring point perturbation direction information, fitness letter
Number is the key that using genetic algorithm Solve problems, and the fitness function that the present invention establishes is as follows：
Set the coding rule in genetic algorithm：(a) encodes circuit operating status：It, will if circuit undisturbed source
Circuit operating status is encoded to 0；If circuit has disturbing source, circuit operating status is encoded to 1.(b) supervises each power quality
The perturbation direction information that instrument provides is surveyed to be encoded：When perturbation direction differentiates that result, to during disturbance, is encoded to 1 to be preceding；When
When perturbation direction differentiates result for backward disturbance, it is encoded to 0.
Wherein：nrFor monitoring point number；
S is the state vector of circuit, and dimension n is determined there is the corresponding element of disturbing source circuit with 1 by the number of circuit
It represents, circuit corresponding element in undisturbed source is represented with 0；
rkIt for the monitoring state of k-th of monitoring point, is represented when perturbation direction judging result is disturbs forward with 1, for backward
It is then represented during disturbance with 0；
For the expectation value function of k-th of monitoring point perturbation direction information, function is referred to as monitored, with circuit operating status
It is information-related；
AkRepresent the disturbance weight of k-th of monitoring state.
(2) function is monitored
The expectation value function of k-th of monitoring pointFor：
Wherein：siFor the operating status on monitoring point k upstreams i-th line road, it is 1 to have disturbing source, is 0 without disturbing source；sjFor
The operating status of monitoring point k downstreams j-th strip circuit, it is 1 to have disturbing source, is 0 without disturbing source.
(4) weight is disturbed
Since the obtained perturbation direction in the weak monitoring point of disturbing signal differentiates that result is often unreliable, it should protrude
Effect of the strong signal in perturbation direction positioning, higher weight is set by the item corresponding to the strong measuring point of disturbing signal.
Disturbing the method that weight is set is：The absolute value of the high frequency components energy final value of all monitoring points is added, is asked for
The proportion of the absolute value of each monitoring point high frequency components energy final value wherein.The disturbance weight A of k-th of detection statekTable
It is up to formula：
In formula, EdkThe high frequency components energy for being k-th of monitoring point at the end of disturbance.
(5) genetic manipulation
Genetic algorithm is the natural selection for simulating Darwinian evolutionism and the biological evolution process of genetic mechanisms
Computation model, is a kind of method by simulating natural evolution process searches optimal solution, and the genetic algorithm condition of convergence is in population
There is the individual of fitness value maximum or the end operation when algorithm reaches maximum iteration.
Disturbance source locating process is exactly that the process of optimal solution is searched in solution space.Due to each monitoring point monitoring state really
Vertical is premised on single disturbance, so the optimal solution of output makes fitness function maximum in addition to meeting, is also needed to meet potential
When the sum of equality constraint, circuit operating status is 1, in optimum individual coding, the circuit representated by digital 1 position may be
Circuit where disturbing source；When the sum of circuit operating status is 0, illustrate nil 1 in the coding of optimum individual, disturbing source exists at this time
Between power supply and power outlet busbar.
Such as Fig. 3, genetic algorithm of the invention is as follows：
A. it determines the position of electric energy quality monitor, circuit operating status is encoded to form genetic algorithm operation institute
Primary population is needed, while evolutionary generation counter g=0 is set, maximum evolutionary generation G is set.
B. according to the fitness function of foundation, the fitness of each individual in population is calculated, and selects fitness highest
Individual is optimal solution.
C. optimal solution is updated, evolutionary generation counter adds 1, if g<G, then population is after selection, intersection, mutation operator
Next-generation population is obtained, retains the highest individual of fitness in population, returns to b；
If g=G, the globally optimal solution recorded at this time is the last solution of power quality disturbance positioning, determines disturbing source
Position.
For by Jiading District in Shanghai City, 110kV favours put down station below, the method for the present invention is further described in detail：
Jiading District in Shanghai City's 110kV favours put down station and share 2 main transformers, and internal wiring of standing is shared 28 times using single mother stock segmented mode
10kV circuits, wherein having 7 times for extension wire.Have 2 back into line, the favour that is advisable respectively 1367 and suitable favour 1368.Electric energy quality monitoring
Instrument is mounted on the head end of circuit, and number is marked, as shown in table 1 according to circuit sequence.The electric energy quality monitoring of switchyard
Instrument is numbered, and adds _ 1 in affiliated circuit serial number.
The flat station track road of 1 110kV favours of table and its electric energy quality monitor number
Three phase short circuit fault, frequency 49500Hz has occurred in 0.1s-0.2s in 9 east of favour name residence of a high official A-wire.9 east of favour name
The monitor number of residence of a high official A-wire circuit head end is M9, and the corresponding monitor of switchyard is M9_1, and Hui5Hui puts down northern circuit head end
Monitor number is M5,8 Nanxiang District intelligence of favour the monitor number of A-wire road head end be M8.When system disturbs, according to this
The disturbing source direction determining method of invention obtains trouble point in the downstream of M9, in the upstream of M9_1, M5, M8, the disturbance energy of M9
It is negative, the disturbance energy of M9_1, M5, M8 are just, the monitoring result of each monitoring point refers to Fig. 4~Fig. 7.
Principle is distributed rationally according to electric energy quality monitoring point proposed by the present invention, with reference to the real network structure of Hui Pingzhan,
Since Hui Pingzhan is there are two transformers, choose that two transformers respectively have 1 and electric energy quality monitor is not installed in 2 outlets.
When there is an outlet not install electric energy quality monitor, can randomly select.Electric energy quality monitoring is not installed when there are two outlets
During instrument, the smaller outlet of load should be chosen.It is therefore assumed that favour is put down in all inlet wires in station and outlet, only 1 favour Pingdong of favour, favour 15 are good
Beautiful, favour 21 praises Cheng Yi and does not install electric energy quality monitor.When all electric energy quality monitor operating statuses are accurate, then electric energy at this time
The state of quality monitor detects downstream disturbances for detector MT1 and M9, and electric energy quality monitor state is as shown in table 2.
2 electric energy quality monitor state of table
| Monitor is numbered | Monitor state | Monitor is numbered | Monitor state |
| MT1 | 1 | M16 | 0 |
| MT2 | 0 | M17 | 0 |
| M2 | 0 | M18 | 0 |
| M3 | 0 | M8_1 | 0 |
| M4 | 0 | M19 | 0 |
| M5 | 0 | M20 | 0 |
| M6 | 0 | M21_1 | 0 |
| M6_1 | 0 | M22 | 0 |
| M8 | 0 | M22_1 | 0 |
| M8_1 | 0 | M23 | 0 |
| M9 | 1 | M23_1 | 0 |
| M9_1 | 0 | M24 | 0 |
| M11 | 0 | M24_1 | 0 |
| M11_1 | 0 | M25 | 0 |
| M12 | 0 | M25_1 | 0 |
| M12_1 | 0 | / | / |
Each monitoring point disturbs weight：
A=[0.2437,0.0336,0.0021,0.0054,0.0163,0.0254,0.0011,0.2590,0.2724,
0.0009,0.0032,0.0124,0.0687,0.0004,0.0016,0.0025,0.0003,0.0036,0.0037,0.0045,
0.0070,0.0072,0.0021,0.0017,0.0035,0.0037,0.0017,0.0017,0.0026,0.0026,0.0017,
0.0017,0.0010,0.0009]；
It it is 20 in initial population individual, iteration 100 times, crossover probability Pc is 0.5, variation at this time by genetic algorithm
Probability P m is under 0.05 setting, and can obtaining fault location, the results are shown in Table 3.As shown in Table 3, fitness value is 1 line
Under the operating status of road, failure has occurred in the 9th article of circuit of label, and disturbance source position accurately is positioned as 9 east of favour name residence of a high official A-wire,
It is consistent with fault message.
3 fault location result of table
| Serial number | Circuit operating status | Fitness value |
| 1 | [0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] | 1 |
| 2 | [0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] | 1 |
| 3 | [0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] | 1 |
| 4 | [0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] | 0.741 |
| 5 | [0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] | 1 |
| 6 | [0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] | 1 |
| 7 | [0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] | 1 |
| 8 | [0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] | 1 |
| 9 | [0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] | 1 |
| 10 | [0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] | 1 |
| 11 | [0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] | 1 |
| 12 | [0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] | 1 |
| 13 | [0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] | 1 |
| 14 | [0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] | 1 |
| 15 | [0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] | 0.9968 |
| 16 | [0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] | 1 |
| 17 | [0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] | 1 |
| 18 | [0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] | 1 |
| 19 | [0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] | 1 |
| 20 | [0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] | 1 |
Genetic algorithm used in the present invention carries out power quality disturbance positioning and considers electric energy quality monitor to disturbing
The situation of energy direction erroneous judgement, the influence generated to distributed generation resource have carried out the considerations of comprehensive, have improved power quality and disturb
The accuracy of dynamic source positioning and serious forgiveness.
Claims (10)
- A kind of 1. distribution network electric energy quality disturbance source locating method containing distributed generation resource, it is characterised in that：The disturbing source Localization method step is as follows：(1) electric energy quality monitor at the monitoring point of each circuit of power distribution network is set, and obtains electric energy quality monitor each The voltage and current signal acquired at monitoring point；(2) high fdrequency component of the voltage and current signal is extracted, high frequency components energy is calculated, judges that each monitoring point is corresponding and disturb Dynamic direction；(3) distribution network electric energy quality disturbance source locating model, inclusive fitness function, monitoring function and disturbance weight are established；(4) to each circuit operating status coding in power distribution network, each electric energy quality monitoring point disturbance side is determined according to monitoring function To the desired value of information；(5) the perturbation direction information of each monitoring point is encoded, determines the monitoring state of each monitoring point；(6) according to the corresponding high frequency components energy in monitoring point each at the end of disturbance, the corresponding disturbance weight of each monitoring state is asked for；(7) result of calculation of step (4)-(6) is substituted into fitness function, optimal solution is sought using genetic algorithm, completes disturbance The positioning in source.
- 2. distribution network electric energy quality disturbance source locating method according to claim 1, which is characterized in that the step (3) In, distribution network electric energy quality disturbance source locating model is：Fitness function：Monitor function：Disturb weight：Wherein：nrFor monitoring point number；S is circuit operating status vector, and dimension n is determined by the number of circuit；rkMonitoring state for k-th of monitoring point；For the expectation value function of k-th of monitoring point perturbation direction information, function is referred to as monitored；AkRepresent the disturbance weight of the monitoring state of k-th of monitoring point；siOperating status for monitoring point k upstreams i-th line road；sjOperating status for monitoring point k downstreams j-th strip circuit；EdkThe high frequency components energy for being k-th of monitoring point at the end of disturbance.
- 3. distribution network electric energy quality disturbance source locating method according to claim 2, which is characterized in that the step (4) In, the coding mode of each circuit operating status is：The corresponding circuit operating status of circuit for having disturbing source represents with 1, The corresponding circuit operating status of circuit in undisturbed source is represented with 0.
- 4. distribution network electric energy quality disturbance source locating method according to claim 1, which is characterized in that the step (5) In, the coding mode of perturbation direction information is：When perturbation direction to be preceding to during disturbance, be encoded to 1, at this time the prison of monitoring point Survey state is represented with 1；When perturbation direction is backward disturbance, 0 is encoded to, the monitoring state of monitoring point is i.e. with 0 at this time It represents.
- 5. the distribution network electric energy quality disturbance source locating method according to claim 1 containing distributed generation resource, feature exist In, the step (in 7), use genetic algorithm seek the process of optimal solution for：Step 5.1, it determines the position of electric energy quality monitor, circuit operating status is encoded to form genetic algorithm operation Required primary population, while evolutionary generation counter g=0 and maximum evolutionary generation G is set.Step 5.2, according to the fitness function of foundation, the fitness of each individual in population is calculated, and selects fitness highest Individual be optimal solution.Step 5.3, optimal solution is updated, evolutionary generation counter adds 1, if g<G, then population by selection, intersect, mutation operator it After obtain next-generation population, retain the highest individual of fitness in population, return to step 5.2；If g=G, the globally optimal solution recorded at this time is the last solution of power quality disturbance positioning, determines disturbance source position.
- 6. the distribution network electric energy quality disturbance source locating method according to claim 1 containing distributed generation resource, feature exist In the determination method in the disturbing source direction is：Step 6.1, disturbance information is acquired, judges the disturbance type of disturbing source；Step 6.2, collected electric current and voltage signal decomposed using wavelet transform, reconstructed, extract the prison The high fdrequency component of voltage and current signal at measuring point；Step 6.3, Power arithmetic is carried out to the high fdrequency component of the electric current at the monitoring point and voltage signal, obtains high frequency components Power, and high frequency components power is integrated, obtain high frequency components energy；Step 6.4, according to the positive and negative judgement disturbing source of high frequency components energy relative to the position of monitoring point, and according to disturbance type Determine disturbing source direction.
- 7. distribution network electric energy quality disturbance source locating method according to claim 6, which is characterized in that the step 6.1 In, if disturbance occurs, voltage when voltage at disturbance is than stable state is low, then it is the disturbance class to absorb energy to judge disturbing source Type；If disturbance occurs, voltage when voltage at disturbance is than stable state is high, then judges disturbance class of the disturbing source for Implantation Energy Type.
- 8. distribution network electric energy quality disturbance source locating method according to claim 7, which is characterized in that the step 6.4 In, for the disturbance type to absorb energy, if the instantaneous power after disturbance occurs is less than steady state power, illustrate that disturbance energy exists Weaken, disturbance energy is negative, and disturbing source is located at the upstream of monitoring point, and judgement perturbation direction is backward disturbance；After if disturbance occurs Instantaneous power be more than steady state power, then illustrate that disturbance energy is enhancing, for just, disturbing source is located under monitoring point disturbance energy Trip, judgement perturbation direction is to be preceding to disturbance；For the disturbance type of Implantation Energy, if the instantaneous power after disturbance occurs is less than steady state power, illustrate disturbance energy Weakening, disturbance energy is negative, and disturbing source is located at the downstream of monitoring point, and judgement perturbation direction is to be preceding to disturbance；If disturbance occurs Instantaneous power afterwards is more than steady state power, then illustrates that disturbance energy is enhancing, and disturbance energy is just, disturbing source is located at monitoring point Upstream, judgement perturbation direction are backward disturbance.
- 9. distribution network electric energy quality disturbance source locating method according to claim 6, which is characterized in that the step 6.3 In, the calculating of high frequency components power is as follows：pd=uAdiAd+uBdiBd+uCdiCdWherein, pdFor high frequency components power；uAd、uBd、uCdThe high fdrequency component of three-phase voltage when occurring for disturbance；iAd、iBd、iCdThe high fdrequency component of three-phase current when occurring for disturbance.
- 10. distribution network electric energy quality disturbance source locating method according to claim 9, which is characterized in that the step 6.3 In, the calculating of high frequency components energy is as follows：High frequency components power is integrated, that is, obtains high frequency components energy, i.e.,：Ed=∫ pddtWherein, EdFor high frequency components energy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810091638.9A CN108206541A (en) | 2018-01-30 | 2018-01-30 | A kind of distribution network electric energy quality disturbance source locating method containing distributed generation resource |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810091638.9A CN108206541A (en) | 2018-01-30 | 2018-01-30 | A kind of distribution network electric energy quality disturbance source locating method containing distributed generation resource |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108206541A true CN108206541A (en) | 2018-06-26 |
Family
ID=62605388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810091638.9A Pending CN108206541A (en) | 2018-01-30 | 2018-01-30 | A kind of distribution network electric energy quality disturbance source locating method containing distributed generation resource |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108206541A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109342885A (en) * | 2018-11-14 | 2019-02-15 | 华北电力大学（保定） | A kind of localization method and system of DC distribution net line fault |
| CN109856506A (en) * | 2019-01-17 | 2019-06-07 | 陕西科技大学 | Singlephase earth fault area positioning method based on the adjoint point method of difference |
| CN110676888A (en) * | 2019-10-14 | 2020-01-10 | 国网山东省电力公司莱芜供电公司 | Method, system, terminal and storage medium for calculating capacity of multi-energy complementary system |
| CN111398714A (en) * | 2020-04-01 | 2020-07-10 | 深圳市中电电力技术股份有限公司 | Multi-data fusion power quality fault diagnosis method and system |
| CN113125886A (en) * | 2021-04-16 | 2021-07-16 | 南京工程学院 | Positioning method for electric energy quality disturbance source |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104635114A (en) * | 2015-03-04 | 2015-05-20 | 江苏省电力公司常州供电公司 | Electric energy quality disturbance source positioning system and positioning method |
-
2018
- 2018-01-30 CN CN201810091638.9A patent/CN108206541A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104635114A (en) * | 2015-03-04 | 2015-05-20 | 江苏省电力公司常州供电公司 | Electric energy quality disturbance source positioning system and positioning method |
Non-Patent Citations (2)
| Title |
|---|
| 毛志芳等: "基于小波变换的电能质量扰动源定位", 《电气制造》 * |
| 董海艳等: "具有容错能力的电能质量扰动源定位方法", 《电力系统保护与控制》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109342885A (en) * | 2018-11-14 | 2019-02-15 | 华北电力大学（保定） | A kind of localization method and system of DC distribution net line fault |
| CN109342885B (en) * | 2018-11-14 | 2020-10-30 | 华北电力大学（保定） | Method and system for positioning line fault of direct-current power distribution network |
| CN109856506A (en) * | 2019-01-17 | 2019-06-07 | 陕西科技大学 | Singlephase earth fault area positioning method based on the adjoint point method of difference |
| CN109856506B (en) * | 2019-01-17 | 2021-07-27 | 陕西科技大学 | Single-phase earth fault area positioning method based on adjacent point difference method |
| CN110676888A (en) * | 2019-10-14 | 2020-01-10 | 国网山东省电力公司莱芜供电公司 | Method, system, terminal and storage medium for calculating capacity of multi-energy complementary system |
| CN111398714A (en) * | 2020-04-01 | 2020-07-10 | 深圳市中电电力技术股份有限公司 | Multi-data fusion power quality fault diagnosis method and system |
| CN113125886A (en) * | 2021-04-16 | 2021-07-16 | 南京工程学院 | Positioning method for electric energy quality disturbance source |
| CN113125886B (en) * | 2021-04-16 | 2023-10-27 | 南京工程学院 | Positioning method for power quality disturbance source |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108206541A (en) | A kind of distribution network electric energy quality disturbance source locating method containing distributed generation resource | |
| CN107506854B (en) | 220kV power grid structure planning method considering differentiation scene | |
| CN103324847B (en) | Electrical Power System Dynamic bad data detection and identification method | |
| CN105119286B (en) | Subsynchronous oscillation source location method and apparatus | |
| Xiang et al. | Reliability correlated optimal planning of distribution network with distributed generation | |
| CN108270239A (en) | A kind of distribution network electric energy quality disturbing source direction determining method containing distributed generation resource | |
| CN111123029A (en) | Distribution network fault section identification method based on zero-sequence current distribution characteristic clustering relation | |
| CN111639841B (en) | Lightning trip-out risk comprehensive evaluation method for high-voltage transmission line | |
| CN106033894B (en) | Method for judging stability of extra-high voltage direct current multi-drop point power grid | |
| CN106026079A (en) | Typological structure comprehensive evaluation method for current collection system of offshore wind plant | |
| CN108616145B (en) | New energy generator tripping optimization method considering voltage influence effect after accident | |
| He et al. | Power system frequency situation prediction method based on transfer learning | |
| CN113011047A (en) | Reliability analysis method based on secondary system of intelligent substation of 220kV or below | |
| Wu | Grounding Fault Detection Method Of Intelligent Distribution Network Under Power Marketing Informatization | |
| CN117406024B (en) | Negative sequence reconstruction technology based on MK (modeling verification) and application method thereof in fault section positioning | |
| Chen et al. | Online theoretical power loss calculation and management system | |
| Qi | LIGHTING AND CONTROL DESIGN OF LARGE-SCALE STADIUM SKATING COMPETITION. | |
| Gu | Evaluation of smart grid construction development impact based on analytic hierarchy process | |
| Li et al. | Research on Reliability Improvement Strategy of Regional Distribution Network | |
| Guo et al. | An Intelligent Optimal Location Method for Booster Transformer of Offshore Wind Power System Based on GIS Geometric Algorithm | |
| Han et al. | Structural optimization of urban distribution network for improving power supply capability | |
| Liu et al. | Overall Voltage Level Reliability and Economy Coordinated Analysis in Distribution Network | |
| Zhuang et al. | Evaluation of Voltage Sag Severity in Provincial Power Grid | |
| CN107171314A (en) | Grid loss on-line calculation method based on trend distributed data after state estimation | |
| Wei et al. | Judgment Logic of 10 kV Line Trunk Power Failure Based on Association Rules |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180626 |