CN101752870B - Method for analysis of available power supply capacity of medium voltage distribution network - Google Patents
Method for analysis of available power supply capacity of medium voltage distribution network Download PDFInfo
- Publication number
- CN101752870B CN101752870B CN201010102923XA CN201010102923A CN101752870B CN 101752870 B CN101752870 B CN 101752870B CN 201010102923X A CN201010102923X A CN 201010102923XA CN 201010102923 A CN201010102923 A CN 201010102923A CN 101752870 B CN101752870 B CN 101752870B
- Authority
- CN
- China
- Prior art keywords
- centerdot
- main transformer
- matrix
- sigma
- power supply
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention, belonging to the field of calculating index of distribution network, the power supply capacity, in planning distribution system, relates to a method for the analysis of available power supply capacity of a medium voltage distribution network, comprising the steps: establishing an available power supply capacity mode; analyzing the communication relationship between main transformers in research area to form a main transformer communication relationship matrix Llink; according to the differences of in-station communication and inter-station communication, partitioning the matrix Llink and correcting the main transformer communication relationship matrix Llink; defining the elements of a capacity matrix R to represent main transformer capacity of corresponding communication center and correcting matrix R; calculating the available power supply capacity of the system; positioning weak points; and acquiring critical capacity. In the method for the analysis of available power supply capacity of the medium voltage distribution network according to the invention, the available power supply capacity calculation mode and the calculation analysis method are put forward, and on the basis of the available power supply capacity, the analysis method is put forward, in which the weak points in grid, which restrict the available power supply capacity, are rapidly positioned by channel-transferring bottleneck matrix, and the minimal element capacity required by communication line is obtained via the critical capacity.
Description
Technical field
The invention belongs to power distribution network index power supply capacity computing field in the distribution system planning, relate to a kind of medium voltage distribution network method for analysis of available power supply capacity.
Background technology
The city power distribution system is the important foundation facility and necessary energy supply system that urban modernization is built.For a long time, the electrical network in the many cities of China exists problems such as power supply capacity deficiency, the network transitions ability is uncertain, the grid equipment utilance is not high, load is unbalanced, loss is big.Along with the continuous increase of electricity needs, electrical network also needs constantly expansion.In order to adapt to the constantly soaring of rapid economy development and power load, the development of distribution construction and major network are adapted, avoid overlapping construction and invest; Need carry out the optimization planning of distribution system, to eliminate safe hidden trouble according to part throttle characteristics and increasing law thereof; Improve operational efficiency; Improve the power supply capacity of distribution system, under the prerequisite that guarantees power grid security, reliability service, meet consumers' demand, for national security, economic development and social stability provide reliable guarantee.
The main function of distribution system is that the electric energy that the transmission system transmission comes is distributed to power consumer efficiently, reliably, and this distribution capability also can be referred to as distribution ability or power supply capacity, the present invention proposes these new ideas of available power supply capacity.The operation of distribution system has the rule that himself need satisfy, if run counter to above-mentioned rule, for example exceeds power supply capacity operation, will cause short circuit, open circuit, damages accident such as power distribution equipment, even lead to grave consequences.In addition, for the redundancy that guarantees that distribution system is certain, it still can be supplied power under fault condition, " urban power network planning and designing guide rule " also stipulated the safety criterion N-1 criterion that distribution system need satisfy.
Therefore, move reliably in order to make power distribution system secure, need be on the basis of distribution network; In conjunction with the operation constraint; Power supply capacity is carried out reasonable assessment,, avoid occurring exceeding the dangerous situation of power supply capacity operation in the operation of power networks process, to carry out corresponding control.The assessment of the power supply capacity of distribution system has become become more meticulous key one ring of assessment and planning of current urban distribution network, for optimizing network configuration, the planning of instructing urban distribution network and operation, has huge economic benefit and social benefit.
The research of related city medium voltage distribution network power supply capacity; Adopted traditionally the exploratory method of approaching and the posteriority formula of constraints being satisfied of desired value; Check the ability of this load level of offered load through distribution power system load flow calculation; With the power supply capacity of definite urban distribution network, or directly calculate the power distribution network power supply capacity.Tradition power supply capacity development of method for calculating has been passed through three phases: one, with the power transformation capacity assessment distribution system power supply capacity stage, compare method as holding to carry.The power transformation capacity of this stage with transformer station is main foundation, estimated mains supply ability size from macroscopic view, and these class methods are calculated simple, but do not consider the effect of distribution network to power supply capacity, and computational methods lose contact with reality; Two, take into account the distribution system power supply capacity research trial stage of network power supply ability, like peak load method of multiplicity, network max-flow method, load-bearing capacity method.When this stage method is examined or check transformer station's power transformation capacity; The foundation of also calculating the feeder line capacity as the mains supply ability; It is actual more to fit, and has proposed the thought blank that the network transitions power supply capacity is calculated, and is irrational but only load estimation network to shift power supply capacity with feeder line; The network practical structures that it is ignored is to the influence of power supply capacity, and result of calculation and physical presence are than big-difference; Three; Based on N-1 safety criterion and the interconnected power supply capacity calculation stages of transformer station's topology; As based on the interconnected method of main transformer, linear programming technique; The wherein the most representative interconnected power supply capacity computational methods of main transformer that are based on are seen application for a patent for invention " the distribution system power supply capacity appraisal procedure (number of patent application 200810151314.6) of a kind of taking into account " N-1 " criterion ".The power distribution network power supply capacity computation model that this stage method proposes; Can calculate in the distribution website under the N-1 condition, the computational methods of network transitions power supply capacity, this type computational methods are calculated easy, practicality is good; But assumed conditions is too desirable, and is big like the transfering channel infinite capacity.Error calculated is bigger, need be according to the actual service conditions of network to the further precision of model.
Available transfer capacity of transmission network (ATC) and maximum transmitted ability (TTC) are the important indicators that the reflection transmission system can be used for the residual capacity of transferring electric power.Two interregional TTC are meant and can satisfy the safe operation requirement of system under normal and particular incident situation in the electric power system, the interconnected electric power transmission network of each zone passage the electric power total amount of ability reliable transmission; ATC considers transmission of electricity agreement and nargin constraint down, available transmission capacity in the electric power transmission network.
Summary of the invention
In traditional power supply capacity is calculated; The calculation assumption condition of power distribution network power supply capacity is very good; Do not consider of the influence of factors such as the network operation, the objective of the invention is, on above-mentioned patent application 200810151314.6 bases the power supply capacity index; A kind of method for analysis of available power supply capacity is proposed, in order to overcome the weak point of power supply capacity algorithm on the sharing of load problem in the past.For this reason, the present invention adopts following technical scheme:
A kind of medium voltage distribution network method for analysis of available power supply capacity comprises the following steps:
The first step: set up the available power supply capacity model
The definition available power supply capacity refers to that power supply unit satisfies under the N-1 criterion condition in certain power supply area; Consider the load supply ability of the maximum under the network practical operation situation, for the power distribution network that contains a plurality of interconnected transformer stations, it satisfies the available power supply capacity of N-1 criterion; Be ASC, express with following formula:
Max?ASC=∑R
iT
i
In the formula (1), R
i, T
iThe rated capacity that is respectively main transformer i satisfies the maximum load rate under the N-1 criterion, Tr with this regional distribution network
IjFor main transformer i takes place under the N-1 failure condition to the size of main transformer j transfer load, k is that main transformer allows overload factor, RL in short-term
IjBe the power-carrying of interconnection between main transformer i and main transformer j, Ω
1 (i)And Ω
2 (i)Represent that respectively with main transformer i be the outer contact of set of contact main transformer and station main transformer set in the station in the main transformer contact unit at center;
Second step: establish total n seat transformer station in the survey region, be numbered 1,2 respectively ..., n, the main transformer platform number of corresponding each transformer station is respectively N
1, N
2..., N
n, get N
∑=N
1+ N
2+ ...+N
n, the communication relationship in the analysis and research zone between each main transformer forms main transformer communication relationship matrix L
Link,
L in the formula
I, jRepresent that there are communication relationship in i platform main transformer and j platform main transformer, get L when having communication relationship
I, j=1, otherwise L
I, j=0, there is communication relationship between regulation main transformer and self, promptly get L
I, i=1; Under i platform main transformer breaks down situation, can its on-load be transferred to j platform main transformer through the interconnection switch action, i=1,2,3 ..., N
∑, j=1,2,3 ..., N
∑
The 3rd goes on foot: that gets in touch with between pressing the interior contact in station and standing is different, to L
LinkMatrix carries out piecemeal, and to according to formula (2) to main transformer communication relationship matrix L
LinkRevise:
In the formula (2), S used in the submatrix on the diagonal positions of matrix in block form
I, iExpression, i is the power transformation station number, S
I, iThe inner contact situation of the expression i of transformer station; Non-leading diagonal submatrix is with S
I, jExpression, i wherein, j representes power transformation station number, S
I, jThe expression i of transformer station, the contact situation between j, according to the inside and outside communication relationship in station L
LinkMatrix is divided into contact matrix L in the station
Link InWith the outer contact in station matrix L
Link Out, the communication relationship in being used for respectively representing standing between main transformer, the communication relationship between outer main transformer of standing;
The 4th step: define the corresponding liaison centre of each element representation of capacity matrix
R matrix main transformer capacity, and the R matrix is revised according to formula
;
R is following for definition sharing of load matrix T:
Tr matrix element Tr
IjIt is big or small to represent to change on-load to j platform main transformer when N-1 takes place i platform main transformer, and main transformer i need be to the main transformer j transfer load Tr that gets in touch with it
I, jFor:
The interconnection power-carrying matrix that definition is represented suc as formula (5):
RL matrix element RL
IjRepresent i, the maximum transmission capacity that allows between j platform main transformer;
Define main transformer maximum load rate matrix T suc as formula (6),
Element T in the T matrix
I, jBeing illustrated in the i main transformer is in the contact unit of liaison centre; Satisfying under the N-1 criterion; The maximum of j main transformer allows load factor, calculates the load factor of interior off-diagonal position, station main transformer, the outer main transformer of standing in liaison centre's main transformer, the T matrix respectively according to formula (7);
The 5th step: system's available power supply capacity calculates
Power supply capacity, network transitions power supply capacity are respectively in the available power supply capacity of whole network, the distribution website:
ASC
out=ASC-ASC
in
The 6th step: location weak spot
Definition transfering channel bottleneck matrix V=Max{Tr-RL, 0}, matrix element have reflected the load transfer demand and have allowed the relation between transfer amount, if matrix element V
Ij>0, show i, the transfering channel capacity limit between the j main transformer electrical network available power supply capacity, this circuit is exactly the weak spot of electrical network.
The 7th step: obtain critical capacity
Definition transfering channel critical capacity matrix U=U [u
Ij]=Max (Tr, Tr
T), matrix element u
IjExpression i needs the peak load of transfer big or small, u between the j main transformer
IjFor the critical capacity of transfering channel, at i, when the transfering channel element is selected between the j main transformer, u
IjBe the critical value of element volume, the selection capacity reaches u
IjElement get final product.
The present invention uses for reference the notion of available transmission capacity; Defined the available power supply capacity (ASC) of medium voltage distribution network; Available power supply capacity computation model and computational analysis method have been proposed; And on the available power supply capacity basis, proposed to locate fast the weak spot of restriction available power supply capacity in the rack through transfering channel bottleneck matrix, obtain the analytical method of the required smallest elements capacity of interconnection through the critical capacity matrix.
Description of drawings
Fig. 1: the whole implementation flow chart of the model of medium voltage distribution network available power supply capacity of the present invention and computational methods;
Fig. 2: the main transformer interconnecting relation sketch map of example network;
Fig. 3: two main transformers allow interconnected transformer station seat number and main transformer maximum load rate relation curve under the overload situations;
Fig. 4: three main transformers allow interconnected transformer station seat number and main transformer maximum load rate relation curve under the overload situations;
Fig. 5: four main transformers allow interconnected transformer station seat number and main transformer maximum load rate relation curve under the overload situations.
Embodiment
At first introduce the available power supply capacity model that the present invention proposes below.
Available power supply capacity refers to that power supply unit satisfies under the N-1 criterion condition in certain power supply area, considers the load supply ability of the maximum under the network practical operation situation.The size of electrical network available power supply capacity depends on main transformer power supply capacity and mains supply transfer ability in the transformer station station.According to the basic definition of available power supply capacity of the present invention, the load of taking into account under the N-1 failure mode changes band, the power supply capacity of a certain transformer station for power supply capacity in this transformer station station add contiguous transformer station can change band the load total amount and.The voltage constraint is one of constraints of electrical network available power supply capacity calculating; But current domestic city power distribution network circuit is shorter; Voltage can meet the demands, thus do not consider the voltage constraint in the model, for the power distribution network that contains a plurality of interconnected transformer stations generally; Its available following formula of available power supply capacity (Available Supply Capability is called for short ASC) that satisfies the N-1 criterion is expressed:
Max?ASC=∑R
iT
i
In the formula (1), R
i, T
iThe rated capacity that is respectively main transformer i satisfies the maximum load rate under the N-1 criterion, Tr with this regional distribution network
IjFor main transformer i takes place under " N-1 " failure condition to the size of main transformer j transfer load, k is that main transformer allows overload factor, RL in short-term
IjPower-carrying for interconnection between main transformer i and main transformer j.Ω
1 (i)And Ω
2 (i)Represent that respectively with main transformer i be the outer contact of set of contact main transformer and station main transformer set in the station in the main transformer contact unit at center.
The target function of formula (1) is the maximum available power supply capacity of system that satisfies all main transformer N-1 criterions, is expressed as the linear forms of maximum load rate.Constraints is to be the main transformer contact unit { T at center with main transformer i
i, Ω
1 (i), Ω
2 (i)N-1 criterion constraint, be called i group constraints, comprise two types of constraints, the one, load balancing constraint, the 2nd, the not out-of-limit physical constraint of loading.When the equality constraint formula was represented main transformer i fault, the normal institute of main transformer i on-load at first shifted to all the other main transformer (Ω in the station before the accident
1 (i)) changeing band, remainder shifts the contact main transformer (Ω to other station
2 (i)) change band, belong to first class constraint; Institute supplied to load k times that is no more than rated capacity after main transformer j accepted the transfer load of fault main transformer i in three inequality constraintss were represented respectively to stand; Contact main transformer j accepts not overload after the transfer load of fault main transformer i; Transfer load is no more than the power-carrying of interconnection between main transformer, all belongs to second class constraint.
Be the detailed description of available power supply capacity computational methods of the present invention below
If total n seat transformer station is numbered 1,2 respectively in the survey region ..., n, the main transformer platform number of corresponding each transformer station is respectively N
1, N
2..., N
nGet N ∑=N
1+ N
2+ ...+N
n, represent the total platform number of this regional main transformer.
The main transformer communication relationship is analyzed
Communication relationship in the analysis and research zone between each main transformer forms main transformer communication relationship matrix L
Link,
L in the formula
I, jRepresent that there are communication relationship in i platform main transformer and j platform main transformer, get L when having communication relationship
I, j=1, otherwise L
I, j=0, there is communication relationship between regulation main transformer and self, promptly get L
I, i=1; Under i platform main transformer breaks down situation, can its on-load be transferred to j platform main transformer through the interconnection switch action, i=1,2,3 ..., N
∑, j=1,2,3 ..., N
∑, N
∑The total platform number of main transformer in the expression institute survey region;
According to the inside and outside communication relationship in station L
LinkMatrix is divided into contact matrix L in the station
Link InWith the outer contact in station matrix L
Link Out, the communication relationship in being used for respectively representing standing between main transformer, the communication relationship between outer main transformer of standing.
revises connection matrix by formula.
Contact unit maximum load rate
Define the corresponding liaison centre of each element representation of capacity matrix
R matrix main transformer capacity, and the R matrix is revised according to formula
.
R is following for definition sharing of load matrix T:
Tr matrix element Tr
IjIt is big or small to represent to change on-load to j platform main transformer when N-1 takes place i platform main transformer.According to the principle that makes full use of the main transformer redundancy capacity, main transformer i need be to the main transformer j transfer load Tr that gets in touch with it
I, jFor:
For analyzing of the influence of interconnection limit transmission capacity, the interconnection power-carrying matrix that definition is represented suc as formula (5) to available power supply capacity:
RL matrix element RL
IjRepresent i, the maximum transmission capacity that allows between j platform main transformer.
Define main transformer maximum load rate matrix T suc as formula (5),
Element T in the T matrix
I, jBeing illustrated in the i main transformer is in the contact unit of liaison centre, is satisfying under the N-1 criterion, and the maximum of j main transformer allows load factor.Matrix T is divided load factor submatrix according to the outer contact relation in contact in the station and station for being deformed in formula (6) frame with the station owner.
Consider the transfering channel capacity, the outer load of standing can't change band fully and have the main transformer of load rejection, and the secondary distribution of loading is given to the N-1 main transformer with the outer load that gets rid of in station and is become band with the station owner.The load factor formula of liaison centre's main transformer (shown in the leading diagonal position main transformer, formula 6 frame of broken lines), stand interior off-diagonal position main transformer (removing diagonal positions element part in the solid box), the outer main transformer of standing (solid box external position element) is respectively:
System's available power supply capacity calculates
The every column element of T matrix is represented the maximum load rate of same main transformer in difference contact unit, and the actual loading rate should be minimum value in these row.
On the basis that all main transformers contact unit available power supply capacities are analyzed, can obtain comprehensively that power supply capacity, network transitions power supply capacity are respectively in the available power supply capacity, distribution website of whole network:
ASC
out=ASC-ASC
in
The weak spot location
V matrix in the available power supply capacity computational process contains some very important information, can observe the reason that influences power distribution network available power supply capacity size, and the weak spot of location power distribution network is for power distribution network optimization provides foundation and basic scheme.
Definition transfering channel bottleneck matrix V=Max{Tr-RL, 0}, the element of matrix V explain that greater than 0 the transfering channel capacity is too little, have limited available power supply capacity, numerical values recited has shown the limited degree size; The element of matrix V equals 0, explains that the transfering channel capacity can not influence the network available power supply capacity.
The V matrix element has reflected the load transfer demand and has allowed the relation between transfer amount, as matrix element V
Ij>0 o'clock, just show i, the transfering channel capacity limit between the j main transformer electrical network available power supply capacity, this circuit is exactly the weak spot of electrical network.
Critical capacity is analyzed
Because the restriction of transfering channel capacity, the available power supply capacity of network can be affected, if what one is particularly good at knows earlier that to transfering channel amount of capacity demand excavation network potential that just can be bigger makes the available power supply capacity of network bigger.
Definition transfering channel critical capacity matrix U=U [u
Ij]=Max (Tr, Tr
T), matrix element u
IjExpression i needs the peak load of transfer big or small, u between the j main transformer
IjCritical capacity for transfering channel.At i, when the transfering channel element is selected between the j main transformer, u
IjBe the critical value of element volume, the selection capacity reaches u
IjElement get final product, the element of excess capacity can not increase the network power supply ability.
About the model of medium voltage distribution network available power supply capacity and the whole implementation flow process of computational methods, can be referring to Fig. 1.
Be that example is found the solution and analyzed below
Certain power distribution network is main with cable system, and built on stilts net is auxilliary.Built on stilts net generally adopts the connection type of the many contacts of many segmentations; Cable system mainly adopts " H " wiring.This power distribution network High Voltage Distribution Substations situation is as shown in table 1.
The contact situation of this network is as shown in the table:
Table 1 network contact situation list
| Main transformer | 2 titles | Contact power-carrying (MVA) |
|
No. two |
40 | |
No. two | Main transformer | 3 of S2 | 6.35 |
No. two | Main transformer | 5 of S3 | 11.3 |
|
No. two |
40 | |
| Main transformer | 5 of S3 | 7.64 |
|
No. two |
2.055 | |
No. two | Main transformer | 5 of S3 | 8.83 |
No. two |
No. two |
2.055 | |
|
No. two |
63 |
One, the main transformer communication relationship is analyzed
Main transformer of S1 among Fig. 2, No. two main transformers of S1, main transformer of S2, No. two main transformers of S2, main transformer of S3, No. two main transformers in Anshan are numbered 1,2,3,4,5,6 respectively, can obtain communication relationship matrix L between the main transformer
Link:
It is following to get interconnection power-carrying matrix by table 1:
Obtain easily:
It is as follows to get the maximum load rate matrix:
(2) system's main transformer maximum permissible load rate is analyzed
The maximum that obtains each main transformer allows load factor column vector T
Max%:
T
max%=[T
1(N-1)?T
2(N-1)?T
3(N-1)?T
4(N-1)?T
5(N-1)?T
6(N-1)]
T
=[65?65?70.12?75.78?57.95?78.6]
(3) system's available power supply capacity analysis-by-synthesis
The available power supply capacity of example network, the interior power supply capacity of standing and network transitions power supply capacity are respectively:
ASC
in=185.9MVA
ASC
out=10.45MVA
Two, weak spot location and prioritization scheme
Example transfering channel bottleneck matrix V is following:
Can be known that by the V matrix transfering channel capacity between 1#-S3 station, S2 station 2#, 2#-S3 station, S2 station 2# main transformer is too small, has influenced the electrical network available power supply capacity, these two transfering channels are the electrical network weak spot.
Three, transfering channel element critical capacity
The transfering channel critical capacity matrix U of example is following
Element representation critical capacity in the matrix U can be followed successively by certificate, selects each transfering channel element.With u
23=6.12 is example, during transfering channel element selection between S1 station 2# main transformer and S2 station 1# main transformer, the selection capacity reaches the element of 6.12MVA.
Four, interconnected scale analysis
Supposing that each interconnected transforming plant main transformer platform number is consistent, promptly all is that two main transformer transformer stations are interconnected, perhaps all is that three main transformer transformer stations are interconnected, and each transformer rated capacity is all consistent.
At this moment,
When k=1.3,
Can obtain result as shown in table 2 below according to following formula.
The desirable net capability of table 2 transformer station internet and main transformer load factor and load transfer ability relation
Transformer station's (seat) | Main transformer (platform number) | Available power supply capacity (times separate unit main transformer capacity) | Main transformer maximum load rate | Transfer ability requires (times separate unit main transformer capacity) | The maximum overload factor that allows |
1 | 2 | 1.3 | 0.65 | 0.0 | 2.00 |
1 | 3 | 2.6 | 0.87 | 0.0 | 1.50 |
1 | 4 | 3.9 | 0.98 | 0.0 | 1.33 |
2 | 2 | 3.3 | 0.83 | 0.7 | 2.00 |
2 | 3 | 5.6 | 0.93 | 0.4 | 1.50 |
2 | 4 | 7.9 | 0.99 | 0.1 | 1.33 |
3 | 2 | 5.3 | 0.88 | 1.4 | 2.00 |
3 | 3 | 8.6 | 0.96 | 0.8 | 1.50 |
3 | 4 | 11.9 | 0.99 | 0.2 | 1.33 |
4 | 2 | 7.3 | 0.91 | 2.1 | 2.00 |
4 | 3 | 11.6 | 0.97 | 1.2 | 1.50 |
4 | 4 | 15.9 | 0.99 | 0.3 | 1.33 |
5 | 2 | 9.3 | 0.93 | 2.8 | 2.00 |
5 | 3 | 14.6 | 0.97 | 1.6 | 1.50 |
5 | 4 | 19.9 | 1.00 | 0.4 | 1.33 |
6 | 2 | 11.3 | 0.94 | 3.5 | 2.00 |
6 | 3 | 17.6 | 0.98 | 2.0 | 1.50 |
6 | 4 | 23.9 | 1.00 | 0.5 | 1.33 |
Last table data march linearize is handled, studied two main transformers, three main transformers respectively, when four main transformer transformer stations are interconnected, the gradual change relation curve between interconnected transformer station seat number and the main transformer maximum load rate is shown in accompanying drawing 3, accompanying drawing 4, accompanying drawing 5.Can be found out that by figure if adopt two main transformers or the interconnected mode of three main transformers, interconnected transformer station seat number should not surpass 4, for four main transformer mutual contact modes, then interconnected transformer station should not be above 3.Surpass these values, little when increasing interconnected transformer station station number to the raising of main transformer load factor, meaningless increase the contact complexity of network.
Claims (1)
1. a medium voltage distribution network method for analysis of available power supply capacity comprises the following steps:
The first step: set up the available power supply capacity model
The definition available power supply capacity refers to that power supply unit satisfies under the N-1 criterion condition in certain power supply area; Consider the load supply ability of the maximum under the network practical operation situation, for the power distribution network that contains a plurality of interconnected transformer stations, it satisfies the available power supply capacity of N-1 criterion; Be ASC, express with following formula:
Max?ASC=∑R
iT
i
In the formula (1), R
i, T
iThe rated capacity that is respectively main transformer i satisfies the maximum load rate under the N-1 criterion, Tr with this regional distribution network
IjFor main transformer i takes place under the N-1 failure condition to the size of main transformer j transfer load, k is that main transformer allows overload factor, RL in short-term
IjBe the power-carrying of interconnection between main transformer i and main transformer j,
With
Represent that respectively with main transformer i be the outer contact of set of contact main transformer and station main transformer set in the station in the main transformer contact unit at center;
Second step: establish total n seat transformer station in the survey region, be numbered 1,2 respectively ..., n, the main transformer platform number of corresponding each transformer station is respectively N
1, N
2..., N
n, get N
∑=N
1+ N
2+ ...+N
n, the communication relationship in the analysis and research zone between each main transformer forms main transformer communication relationship matrix L
Link,
L in the formula
IjRepresent that there are communication relationship in i platform main transformer and j platform main transformer, get L when having communication relationship
I, j=1, otherwise L
I, j=0, there is communication relationship between regulation main transformer and self, promptly get L
I, i=1; Under i platform main transformer breaks down situation, can its on-load be transferred to j platform main transformer through the interconnection switch action, i=1,2,3 ..., N
∑, j=1,2,3 ..., N
∑
The 3rd goes on foot: that gets in touch with between pressing the interior contact in station and standing is different, to L
LinkMatrix carries out piecemeal, and according to formula (2) to main transformer communication relationship matrix L
LinkRevise:
In the formula (2), S used in the submatrix on the diagonal positions of matrix in block form
I, iExpression, i is the power transformation station number, S
I, iThe inner contact situation of the expression i of transformer station; Non-leading diagonal submatrix is with S
I, jExpression, i wherein, j representes power transformation station number, S
I, jThe expression i of transformer station, the contact situation between j, according to the inside and outside communication relationship in station L
LinkMatrix is divided into connection matrix in the station
With the outer contact in station matrix
Communication relationship in being used for respectively representing standing between main transformer, the communication relationship between outer main transformer of standing;
The 4th step: define the corresponding liaison centre of each element representation of capacity matrix
R matrix main transformer capacity, and the R matrix is revised according to formula
;
R is following for definition sharing of load matrix T:
Tr matrix element Tr
I, jTo j platform main transformer transfer load size, main transformer i need be to the main transformer j transfer load Tr that gets in touch with it when representing i platform main transformer generation N-1 fault
I, jFor:
The interconnection power-carrying matrix that definition is represented suc as formula (5):
RL matrix element RL
I, jRepresent i, the maximum transmission capacity that allows between j platform main transformer;
Define main transformer maximum load rate matrix T suc as formula (6),
Element T in the T matrix
I, jBeing illustrated in the i main transformer is in the contact unit of liaison centre; Satisfying under the N-1 criterion; The maximum of j main transformer allows load factor, calculates the load factor of interior off-diagonal position, station main transformer, the outer main transformer of standing in liaison centre's main transformer, the T matrix respectively according to formula (7);
The 5th step: system's available power supply capacity calculates
Power supply capacity, network transitions power supply capacity are respectively in the available power supply capacity of whole network, the distribution website:
ASC
out=ASC-ASC
in
The 6th step: location weak spot
Definition transfering channel bottleneck matrix V=Max{Tr-RL, 0}, matrix element have reflected the load transfer demand and have allowed the relation between transfer amount, if matrix element V
Ij>0, show i, the transfering channel capacity limit between the j main transformer electrical network available power supply capacity, this circuit is exactly the weak spot of electrical network;
The 7th step: obtain critical capacity
Definition transfering channel critical capacity matrix U=[u
Ij]=Max (Tr, Tr
T), matrix element u
IjExpression i needs the peak load of transfer big or small, u between the j main transformer
IjFor the critical capacity of transfering channel, at i, when the transfering channel element is selected between the j main transformer, u
IjBe the critical value of element volume, the selection capacity reaches u
IjElement get final product.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201010102923XA CN101752870B (en) | 2010-01-29 | 2010-01-29 | Method for analysis of available power supply capacity of medium voltage distribution network |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201010102923XA CN101752870B (en) | 2010-01-29 | 2010-01-29 | Method for analysis of available power supply capacity of medium voltage distribution network |
Publications (2)
Publication Number | Publication Date |
---|---|
CN101752870A CN101752870A (en) | 2010-06-23 |
CN101752870B true CN101752870B (en) | 2012-05-23 |
Family
ID=42479416
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201010102923XA Expired - Fee Related CN101752870B (en) | 2010-01-29 | 2010-01-29 | Method for analysis of available power supply capacity of medium voltage distribution network |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN101752870B (en) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102025153B (en) * | 2010-12-15 | 2012-11-14 | 天津大学 | Method for accurately calculating maximum power supply capacity of medium voltage distribution network |
CN103093391A (en) * | 2011-10-28 | 2013-05-08 | 上海博英信息科技有限公司 | City power distribution network arranging method |
CN102522747B (en) * | 2011-12-26 | 2014-05-07 | 天津大学 | Calculation method of power supply capability of power distribution system |
CN102622711B (en) * | 2012-03-31 | 2015-02-25 | 天津大学 | Power distribution network planning method based on maximum power supply capacity |
CN102769287B (en) * | 2012-07-04 | 2014-09-17 | 天津大学 | Power distribution network TSC (total supply capacity) calculation method |
CN103474988B (en) * | 2013-09-10 | 2015-03-04 | 国电南瑞科技股份有限公司 | Emergency control optimization method of electrolytic aluminum self-prepared power grid and based on transient state safety and stability |
CN104485662A (en) * | 2014-11-24 | 2015-04-01 | 国家电网公司 | Method of calculating maximum power supply capability of power distribution network during parallel operation of substation |
CN104538959A (en) * | 2015-01-06 | 2015-04-22 | 国家电网公司 | Method for assessing high voltage distribution network load transfer capacity |
CN104836224B (en) * | 2015-01-26 | 2017-10-24 | 国家电网公司 | A kind of power distribution network partition method based on net capability |
CN105205740B (en) * | 2015-10-23 | 2018-11-06 | 国家电网公司 | Consider the power distribution network evaluation of power supply capability method that main transformer interconnecting relation effectively extends |
CN106972518B (en) * | 2017-04-17 | 2023-07-21 | 国家电网公司 | Access mode selection method for direct-current (DC) delivery system of small local power grid and energy base |
CN107168070B (en) * | 2017-07-11 | 2019-04-26 | 重庆大学 | A kind of control method of transformer transfer load |
CN107453354B (en) * | 2017-07-18 | 2019-11-15 | 浙江大学华南工业技术研究院 | A kind of weak link recognition methods of power distribution network |
CN107968397B (en) * | 2017-11-27 | 2020-09-25 | 国网江西省电力有限公司经济技术研究院 | Distribution network transmission capacity calculation method considering operation randomness |
CN109638827B (en) * | 2018-12-27 | 2020-11-20 | 清华大学 | Method and system for analyzing power supply capacity of medium-voltage distribution network containing power electronic transformer |
CN110061500B (en) * | 2019-06-04 | 2021-03-12 | 广东电网有限责任公司 | Rapid assessment method and system for power supply capacity of power distribution network |
CN117436222B (en) * | 2023-12-21 | 2024-04-23 | 国网天津市电力公司电力科学研究院 | Method and system for calculating maximum power supply capacity of power distribution network |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101431238A (en) * | 2008-09-12 | 2009-05-13 | 天津天大求实电力新技术股份有限公司 | Power distribution network power supply capacity evaluation method considering N-1 criterion |
-
2010
- 2010-01-29 CN CN201010102923XA patent/CN101752870B/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101431238A (en) * | 2008-09-12 | 2009-05-13 | 天津天大求实电力新技术股份有限公司 | Power distribution network power supply capacity evaluation method considering N-1 criterion |
Non-Patent Citations (3)
Title |
---|
JP特开2001-78358A 2001.03.23 |
Karen Nan Miu et al.Electric distribution system load capability problem formulation, solution algorithm, and numerical results.《IEEE Transactions on Power Delivery》.2000,第15卷(第1期), * |
王成山等.基于主变互联关系的配电系统供电能力计算方法.《中国电机工程学报》.2009,第29卷(第13期), * |
Also Published As
Publication number | Publication date |
---|---|
CN101752870A (en) | 2010-06-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN101752870B (en) | Method for analysis of available power supply capacity of medium voltage distribution network | |
CN102025153B (en) | Method for accurately calculating maximum power supply capacity of medium voltage distribution network | |
CN101431238B (en) | Power distribution network power supply capacity evaluation method considering N-1 criterion | |
Mateo et al. | European representative electricity distribution networks | |
Banzo et al. | Stochastic optimization model for electric power system planning of offshore wind farms | |
CN102522747B (en) | Calculation method of power supply capability of power distribution system | |
CN107464048B (en) | Day-ahead plan security check method based on research state | |
Xu et al. | Case-based reasoning for coordinated voltage control on distribution networks | |
CN102437573A (en) | Evaluation and control method and system for reliability of electric distribution network based on fuzzy modeling | |
CN105207213A (en) | Power distribution network N-1 calibration method taking segmental load transfer into consideration | |
CN102508950A (en) | Regional dispatching automatic system and method for communication between regional dispatching automatic system and remote monitoring diagnosis centre | |
CN102403716A (en) | Dynamic equalizing method for multi-infeed alternating/direct-current power grid | |
CN104934964A (en) | Power distribution network reconstruction and island division method containing distributed power supply | |
CN104485660A (en) | Directed relational graph-based power distribution network reliability evaluation method | |
CN103093391A (en) | City power distribution network arranging method | |
Rupolo et al. | Medium‐and low‐voltage planning of radial electric power distribution systems considering reliability | |
CN113888350A (en) | Power grid planning project ordering method considering power supply reliability in transition period | |
Soukaina et al. | Hosting capacity estimation of underground distribution feeder in Urbain Areas | |
CN104485662A (en) | Method of calculating maximum power supply capability of power distribution network during parallel operation of substation | |
CN107221926B (en) | TSC-based feeder line access user capacity calculation method | |
CN104836224A (en) | Power distribution network partition method based on maximum power supply capability | |
Pereira et al. | Composite generation-transmission expansion planning | |
Jiang et al. | Research on load transfer strategy optimisation with considering the operation of distributed generations and secondary dispatch | |
CN104063751A (en) | Sensitivity analysis method of largest power supply capacity influence factors | |
CN107565547A (en) | A kind of power distribution network operation reliability evaluation and optimization system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C06 | Publication | ||
PB01 | Publication | ||
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120523 Termination date: 20220129 |
|
CF01 | Termination of patent right due to non-payment of annual fee |