CN109190792A - A kind of method and system of the configuration of determining Distributed Generation in Distribution System - Google Patents
A kind of method and system of the configuration of determining Distributed Generation in Distribution System Download PDFInfo
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Abstract
The present invention provides the method and system of the configuration and assessment of a kind of determining Distributed Generation in Distribution System, described method and system includes: the model of the index system and each index of establishing the distribution network reliability of assessment access distributed generation resource, according to the via net loss of power distribution network, power failure cost and the cost of investment of distributed generation resource establish the economy model of the power distribution network of access distributed generation resource, and using the power supply reliability index model and economy model as the Multiobjective programming models of the power distribution network of access distributed generation resource, allocation optimum of the distributed generation resource in power distribution network is obtained using genetic algorithm.Described method and system optimizes while realizing distributed electrical Source Type, position and access capacity, and the power supply reliability and economy that distributed generation resource is not added by comparative analysis power distribution network and is added after distributed generation resource, it determines and accesses promotion of the allocation optimum of distributed generation resource to distribution network reliability and economy in the power distribution network.
Description
Technical field
The present invention relates to distribution network planning field of configuration, and more particularly, to distributed in a kind of determining power distribution network
The method and system of the configuration of power supply.
Background technique
Power distribution network is the intermediate link that electric system grid is connected with user, and distribution network voltage grade is more, network
Structure is complicated, device type multiplicity, therefore the security risk factor of power distribution network is also relatively more.To guarantee that power distribution network is reliably high
The operation of effect needs to plan it.It is on the basis of existing power distribution network status analysis, to meet that conventional electrical distribution network planning, which is drawn,
In a certain respect or some aspects are optimal and the process that is transformed to it.The load that distribution network planning generally includes planning period is pre-
It surveys, grid loss calculation, voltage level analysis, power supply reliability analysis etc..In recent years, with distributed generation resource
(Distributed Generation's, DG) greatly develops, when carrying out distribution network planning, more new factors be considered into
Come, open space planning and the method for conventional electrical distribution net are challenged.Distributed generation resource has small scale, environmental-friendly, using energy source
High-efficient feature, access power distribution network can not only readjust the energy structure, and mitigate environmental pressure, more because of its Independent Power Generation characteristic,
It is able to solve the difficult problem of remote districts power supply, improves power distribution network bulk supply reliability, therefore the extensive of distributed generation resource answers
With no matter all being benefited with great for society or distribution system itself.But the access of distributed generation resource also can be to conventional electrical distribution
The planning of net generates impact.Distributed generation resource accesses so that the open space planning of power distribution network becomes more complicated, first distributed electrical
Objective function, the constraint condition etc. of plan model all change after source access power distribution network；Secondly answering along with plan model
The solution difficulty of hydridization, planning problem also increases.
To sum up, being badly in need of a kind of planning of power distribution network for access distributed generation resource, to improve the power distribution network
Power supply reliability and economy.
Summary of the invention
In order to solve to lack corresponding programming evaluation and reliable for the power distribution network of access distributed generation resource in the prior art
Property and economy verify the technical issues of, the present invention provides a kind of method of the configuration of determining Distributed Generation in Distribution System, institute
The method of stating includes:
Establish the power output model of the distributed generation resource accessed in power distribution network, wherein the distributed generation resource includes wind-force hair
Electric system and photovoltaic generating system；
Establish the index system of the distribution network reliability of assessment access distributed generation resource, wherein the index system
In index include 1 with assess the relevant index distribution network load point annual power off time of power distribution network economy and several
The index unrelated with assessment power distribution network economy；
According to the power output model of the distributed generation resource of power distribution network access, the index unrelated with assessment power distribution network economy is established
Model；
According to the fault model of element in the power output model of the power distribution network distributed generation resource, power distribution network, covered with timing
Special calot's method determines each load point annual power off time of power distribution network；
The power failure cost of power distribution network is determined according to the average annual power off time of each load point of the power distribution network；
Using the annual operating and maintenance cost of power distribution network as general objective, damaged according to the cost of investment of the distributed generation resource of power distribution network, network
It expends use and power failure cost establishes the economy model that the power distribution network of access distributed generation resource is run；
By index unrelated with assessment economy in the distribution network reliability of the assessment access distributed generation resource
The Multiobjective programming models of model and economy model as the power distribution network of access distributed generation resource, in the constraint condition of setting
Under, the allocation optimum of distributed generation resource access power distribution network is determined using genetic algorithm, and distributed generation resource is not accessed to power distribution network
With access distributed generation resource after power supply reliability and economy compare and analyze.
Further, the power output model for establishing the distributed generation resource accessed in power distribution network includes:
It is established according to the actual wind speed data of the wind generator system their location of the quasi- access of power distribution network and obeys Weibull point
The Wind speed model of cloth, and establish according to the Wind speed model power output model P of wind generator systemWTG(v), its calculation formula is；
In formula, vci, vcr, vcoRespectively cut wind speed, rated wind speed and cut-out wind speed, prFor wind generator system blower
Rated output power, when wind speed be less than vciWhen, blower is not run；When wind speed is in vciWith vcrBetween when, blower contribute with wind
Speed increasing and increase, approximation be in a curve；When wind speed is greater than vcrAnd it is less than vcoWhen, blower power output is rated value；Work as wind speed
Greater than vcoWhen, blower stops working due to safety concerns；
It is established according to the practical intensity of illumination data of the photovoltaic generating system their location of the quasi- access of power distribution network and obeys beta
The intensity of illumination model of distribution, and according to the power output model P of the intensity of illumination model foundation photovoltaic generating systemPVG, calculate
Formula are as follows:
In formula, S is intensity of illumination, SrFor photovoltaic generating system intensity of illumination rated value, when intensity of illumination is greater than 0 and is less than
When rated value, the power output of photovoltaic increases with the increase of light intensity, and approximation is in a curve；When intensity of illumination is greater than rated value,
Photovoltaic power output reaches nominal output, no longer increases as light intensity increases.
Further, it is described establish assessment access distributed generation resource distribution network reliability index system refer to by
Distributed generation resource year Generation Rate, year power output interruption rate, stability bandwidth, isolated island annual power-on time, isolated island annual power supply amount,
It is the index and distribution network load point annual power off time unrelated with assessment power distribution network economy that isolated island annual, which lacks power supply volume,
The index of distribution network reliability as assessment access distributed generation resource, wherein when distribution network load point annual has a power failure
Between be with the related index of assessment power distribution network economy, distributed generation resource year Generation Rate, contribute in year interruption rate, stability bandwidth, isolated island
Annual power-on time, isolated island annual power supply amount, the scarce power supply volume of isolated island annual are unrelated with assessment power distribution network economy
Index.
Further, the power output model of the distributed generation resource according to power distribution network access is established and assessment power distribution network warp
The model of the unrelated index of Ji property includes:
Distributed generation resource year Generation Rate index GRDG reflection distributed generation resource actual power generation accounts for the specified hair of distributed generation resource
The ratio of electricity, unit %, calculation formula are as follows:
In formula, p (t) is the power generating value of t-th of moment distributed generation resource, PDGNFor the rated output power of distributed generation resource,
T is the total time of distributed generation resource operation；
The interruption degree for interruption rate index PIPDG reflection distributed generation resource power output of contributing in distributed generation resource year, and the index
Value has the power supply reliability of isolated island and significantly influences, unit %, and calculation formula is as follows:
In formula, T indicates that the operation time limit of distributed generation resource, ∑ t { p (t)=0 } indicate the distributed generation resource in the operation time limit
Set at the time of power output is 0；
Distributed generation resource stability bandwidth index PFDG passes through the Difference Calculation of previous moment and later moment in time, when obtaining entire T
The fluctuation situation of distributed generation resource power output, can effectively reflect the fluctuating change of distributed power source output power in section, unit %,
Calculation formula is as follows:
In formula, P (t) is the activity of force that goes out of t moment distributed generation resource, and P (t+1) is the power output of t+1 moment distributed generation resource
Power；
Isolated island annual power-on time APSTI reflects the annual power-off condition of major network, and orphan when reflection major network failure
The annual powers duration on island, calculation formula are as follows:
In above formula, YEAR is the emulation time limit, and i is load point, PL,iFor the demand power of load point i, PDGFor distributed electrical
The output power in source, N are the number of isolated island normal power supply, RjRegion, t are divided for the isolated island under jth time island statejFor jth time
Power-on time when isolated island normal power supply；
Isolated island annual power supply amount AESI reflects that the power supply capacity of isolated island, calculation formula are as follows in terms of electricity supports:
In formula, YEAR is the emulation time limit, and N is the number for emulating isolated island normal power supply in time limit YEAR, EjIt is lonely for jth time
The power supply amount when normal power supply of island, RjRegion, P are divided for the isolated island under jth time island stateL,iFor i-th of load in isolated island
The power of point, tjPower-on time when isolated island normal power supply secondary for jth；
Isolated island annual lacks the power supply capacity that power supply volume AENSI reflects isolated island in terms of electricity vacancy, and calculation formula is as follows:
In formula, YEAR is the emulation time limit, NlossFor the insufficient number of island power supply, Eloss,jWhen having a power failure for jth time isolated island
Scarce power supply volume, RjRegion, P are divided for the isolated island under jth time island stateL,iFor the power of i-th of load point in isolated island,
tloss,jFor the power off time of jth time isolated island.
Further, it is described according to the power output model of the power distribution network distributed generation resource, in power distribution network element failure mould
Type determines that each load point annual power off time of power distribution network includes: with timing Monte Carlo method
Step 1, setting calculate the initial of each load point annual power off time of the power distribution network of access distributed generation resource
Moment t=0；
Step 2 generates (0,1) random number to all elements of power distribution network, is found out often according to element fault probability distribution function
The normal working hours TTF of a element；
Step 3 takes the smallest element of TTF to be fault element, generates (0,1) random number to fault element, is repaired according to failure
Multiple model calculates the repair time TTR of fault element；
Step 4 determines the load point for being influenced and being had a power failure by fault element, and judges whether power failure load point can be broken by major network
Road device restores electricity, and when power failure load point cannot be restored electricity by major network breaker, step 5 is gone to, when power failure load point energy
When being restored electricity by major network breaker, step 9 is gone to；
Step 5, type and the installed capacity of the distributed generation resource installed in conjunction with power failure load point and power distribution network access point
The power output model of cloth power supply determines the power output and load power of the distributed generation resource, and big in the power output of distributed generation resource
When load power, step 6 is gone to, when the power output of distributed generation resource is not more than load power, goes to step 8；
The load point number of stoppages is added 1 by step 6, and power off time is the time that distributed generation resource puts into operation；
The TTF of each element and TTR are added to calculating time t by step 7, and when t is less than setting value, go to step
2, when t is not less than setting value, go to step 10；
In step 8, the load point number of stoppages is added to 1, power off time is the repair time of fault element, goes to step 10；
The load point number of stoppages is added 1 by step 9, and power off time is the breaker operator time；
Step 10, each load point of power distribution network of output access distributed generation resource entirely calculates the frequency of power cut of time and stops
The electric time, and average to obtain the annual power off time of each load point.
Further, it is described according to the average annual power off time of each load point of the power distribution network determine the power failure of power distribution network at
This, its calculation formula is:
In formula, n is distribution network load number of nodes, tiIt is the year power off time of i-th of load point, PiIt is i-th of load point
Load power, ceIt is unit price of power.
Further, described using the annual operating and maintenance cost of power distribution network as general objective, according to the throwing of the distributed generation resource of power distribution network
Provide the economy model packet that cost, via net loss expense and power failure cost establish the power distribution network operation of access distributed generation resource
It includes:
Calculate the cost of investment C of distributed generation resourceDG, i.e. year of the construction of node to be installed described in power distribution network distributed generation resource
Expense summation, its calculation formula is:
In formula, r is annual cost coefficient, and m is the operation time limit of distributed generation resource planning, NDGFor the to be installed of distributed generation resource
Number of nodes, CiFor the specific investment cost cost of all kinds of distributed generation resources, SDG,iFor the installed capacity of distributed generation resource；
The load bus that distributed generation resource is regarded as to power distribution network calculates power distribution network via net loss expense with forward-backward sweep method
Closs, its calculation formula is:
In formula, t is power distribution network circuitry number, Ploss,iIt is the via net loss of i-th branch, τmaxBe the year of i-th branch most
Hourage, c is lost in big loadeIt is unit price of power；
Using the annual operating and maintenance cost of power distribution network as general objective, damaged according to the cost of investment of the distributed generation resource of power distribution network, network
It expends use and reliability cost establishes the economy model that the power distribution network of access distributed generation resource is run, calculation formula is such as
Under:
minZcost=CDG+Closs+CD
In formula, ZcostIt is the year overall cost for accessing the power distribution network after distributed generation resource, CDGIt is being averaged for distributed generation resource
Year cost of investment, ClossIt is the power distribution network average year via net loss expense accessed after distributed generation resource, CDIt is access distributed generation resource
The year power failure cost of power distribution network afterwards.
Further, it is described by it is described assessment access distributed generation resource distribution network reliability in assessment economy
Multiobjective programming models of the model and economy model of unrelated index as the power distribution network of access distributed generation resource, are being arranged
Constraint condition under, the allocation optimum of distributed generation resource access power distribution network is determined using genetic algorithm, and power distribution network is not accessed
Distributed generation resource with access distributed generation resource after power supply reliability and economy compare and analyze and include:
By the model of index unrelated with assessment economy in the distribution network reliability of assessment access distributed generation resource
Multiobjective programming models with economy model as the power distribution network of access distributed generation resource, and setting makes to access distributed generation resource
Power distribution network operate normally two kinds of constraint conditions of equality constraint and inequality constraints, wherein the equality constraint be power distribution network
Trend constraint, inequality constraints include power distribution network node voltage constraint, line current constraint, line transmission power constraint and
The constraint of distributed generation resource amount；
The distributed generation resource for intending access in power distribution network is encoded using integer mode, the chromosome coding of genetic algorithm is long
Degree determines quasi- access in power distribution network after being set as the type of distributed generation resource and the installation site of distributed generation resource and two sections of capacity
Distributed generation resource allocation optimum, in which:
The type of distributed generation resource is encoded to randint (1, n, [0,1]), can voluntarily provide 0 or 1 represent photovoltaic or
Blower, n are distributed generation resource number to be installed；
Distributed generation resource installation site and capacity are encoded to randint (1, d, [1, n]), wherein d are as follows:
D=floor (PDGmax/DGmin)
PDGmax is the corresponding power of the distributed generation resource installed capacity upper limit that power distribution network allows in formula, and DGmin is distribution
Formula power supply minimum installed capacity；
Chromosome coding are as follows:
X=[randint (1, n, [0,1]) randint (1, d, [1, n])]；
According to the allocation optimum for the distributed generation resource for intending access in determining power distribution network, comparative analysis power distribution network is not added point
Cloth power supply and the power supply reliability and economy being added after distributed generation resource, determine in the power distribution network and access distributed generation resource
Promotion of the allocation optimum to distribution network reliability and economy.
According to another aspect of the present invention, what the present invention provided a kind of configuration of determining Distributed Generation in Distribution System is
System, the system comprises:
Power output model unit, is used to establish the power output model of the distributed generation resource accessed in power distribution network, wherein described point
Cloth power supply includes wind generator system and photovoltaic generating system；
Index determination unit is used to establish the index body of the distribution network reliability of assessment access distributed generation resource
System, wherein the index in the index system includes 1 index distribution network load point year relevant to assessment power distribution network economy
Average power off time and several indexs unrelated with assessment power distribution network economy；
Index model unit, the power output model for the distributed generation resource for being used to be accessed according to power distribution network, foundation are matched with assessment
The model of the unrelated index of economic power system；
Power off time unit is used for the power output model according to the power distribution network distributed generation resource, element in power distribution network
Fault model determines each load point annual power off time of power distribution network with timing Monte Carlo method；
Power failure cost-element is used to determine stopping for power distribution network according to the average annual power off time of each load point of the power distribution network
Electric cost；
Economic model unit is used for using the annual operating and maintenance cost of power distribution network as general objective, according to the distributed electrical of power distribution network
Cost of investment, via net loss expense and the power failure cost in source establish the economy mould of the power distribution network operation of access distributed generation resource
Type；
Configuration unit, being used for will be economical with assessment in the distribution network reliability of the assessment access distributed generation resource
Property unrelated index Multiobjective programming models as the power distribution network of access distributed generation resource of model and economy model, setting
Under the constraint condition set, the allocation optimum of distributed generation resource access power distribution network is determined using genetic algorithm, and power distribution network is not connect
Enter distributed generation resource with access distributed generation resource after power supply reliability and economy compare and analyze.
Further, the power output model unit includes:
First power output model unit is used for the practical wind of the wind generator system their location according to the quasi- access of power distribution network
Fast data establish the Wind speed model for obeying Weibull distribution, and the power output mould of wind generator system is established according to the Wind speed model
Type PWTG(v), its calculation formula is；
In formula, vci, vcr, vcoRespectively cut wind speed, rated wind speed and cut-out wind speed, prFor wind generator system blower
Rated output power, when wind speed be less than vciWhen, blower is not run；When wind speed is in vciWith vcrBetween when, blower contribute with wind
Speed increasing and increase, approximation be in a curve；When wind speed is greater than vcrAnd it is less than vcoWhen, blower power output is rated value；Work as wind speed
Greater than vcoWhen, blower stops working due to safety concerns；
Second power output model unit is used for the practical light of the photovoltaic generating system their location according to the quasi- access of power distribution network
The intensity of illumination model for obeying beta distribution is established according to intensity data, and according to the intensity of illumination model foundation photovoltaic power generation system
The power output model P of systemPVG, its calculation formula is:
In formula, S is intensity of illumination, SrFor photovoltaic generating system intensity of illumination rated value, when intensity of illumination is greater than 0 and is less than
When rated value, the power output of photovoltaic increases with the increase of light intensity, and approximation is in a curve；When intensity of illumination is greater than rated value,
Photovoltaic power output reaches nominal output, no longer increases as light intensity increases.
Further, the index determination unit by distributed generation resource year Generation Rate, year contribute interruption rate, stability bandwidth, orphan
Island annual power-on time, isolated island annual power supply amount, isolated island annual lack power supply volume be with assessment power distribution network economy without
Distribution network reliability of index and distribution network load the point annual power off time of pass as assessment access distributed generation resource
Index, wherein distribution network load point annual power off time is and the related index of assessment power distribution network economy, distributed electrical
Source year Generation Rate, year power output interruption rate, stability bandwidth, isolated island annual power-on time, isolated island annual power supply amount, isolated island year are flat
Lacking power supply volume is the index unrelated with assessment power distribution network economy.
Further, the index model unit includes:
First model unit, is used to calculate distributed generation resource year Generation Rate index GRDG, and the GRDG reflection is distributed
Power supply actual power generation accounts for the ratio of distributed generation resource rated generation amount, unit %, and calculation formula is as follows:
In formula, p (t) is the power generating value of t-th of moment distributed generation resource, PDGNFor the rated output power of distributed generation resource,
T is the total time of distributed generation resource operation；
Second model unit is used to calculate distributed generation resource year power output interruption rate index PIPDG, the PIPDG reflection
The interruption degree of distributed generation resource power output, and the index value has the power supply reliability of isolated island and significantly influences, unit
For %, calculation formula is as follows:
In formula, T indicates that the operation time limit of distributed generation resource, ∑ t { p (t)=0 } indicate the distributed generation resource in the operation time limit
Set at the time of power output is 0；
Third model unit is used to calculate distributed generation resource stability bandwidth index PFDG, the PFDG and passes through previous moment
With the Difference Calculation of later moment in time, the fluctuation situation that distributed generation resource is contributed in the entire T period is obtained, can effectively reflect distribution
The fluctuating change of output power of power supply, unit %, calculation formula are as follows:
In formula, P (t) is the activity of force that goes out of t moment distributed generation resource, and P (t+1) is the power output of t+1 moment distributed generation resource
Power；
4th model unit is used to calculate isolated island annual power-on time APSTI, the year of the APSTI reflection major network
Average power-off condition, and when reflection major network failure isolated island annual powers duration, calculation formula is as follows:
In above formula, YEAR is the emulation time limit, and i is load point, PL,iFor the demand power of load point i, PDGFor distributed electrical
The output power in source, N are the number of isolated island normal power supply, RjRegion, t are divided for the isolated island under jth time island statejFor jth time
Power-on time when isolated island normal power supply；
5th model unit is used to calculate isolated island annual power supply amount AESI, the isolated island annual power supply amount
AESI reflects that the power supply capacity of isolated island, calculation formula are as follows in terms of electricity supports:
In formula, YEAR is the emulation time limit, and N is the number for emulating isolated island normal power supply in time limit YEAR, EjIt is lonely for jth time
The power supply amount when normal power supply of island, RjRegion, P are divided for the isolated island under jth time island stateL,iFor i-th of load in isolated island
The power of point, tjPower-on time when isolated island normal power supply secondary for jth；
6th model unit is used to calculate isolated island annual and lacks power supply volume AENSI, and the isolated island annual lacks power supply volume
AENSI reflects that the power supply capacity of isolated island, calculation formula are as follows in terms of electricity vacancy:
In formula, YEAR is the emulation time limit, NlossFor the insufficient number of island power supply, Eloss,jWhen having a power failure for jth time isolated island
Scarce power supply volume, RjRegion, P are divided for the isolated island under jth time island stateL,iFor the power of i-th of load point in isolated island,
tloss,jFor the power off time of jth time isolated island.
Further, the power off time unit is according in the power output model of the power distribution network distributed generation resource, power distribution network
The fault model of element determines that each load point annual power off time of power distribution network includes: with timing Monte Carlo method
Step 1, setting calculate the initial of each load point annual power off time of the power distribution network of access distributed generation resource
Moment t=0；
Step 2 generates (0,1) random number to all elements of power distribution network, is found out often according to element fault probability distribution function
The normal working hours TTF of a element；
Step 3 takes the smallest element of TTF to be fault element, generates (0,1) random number to fault element, is repaired according to failure
Multiple model calculates the repair time TTR of fault element；
Step 4 determines the load point for being influenced and being had a power failure by fault element, and judges whether power failure load point can be broken by major network
Road device restores electricity, and when power failure load point cannot be restored electricity by major network breaker, step 5 is gone to, when power failure load point energy
When being restored electricity by major network breaker, step 9 is gone to；
Step 5, type and the installed capacity of the distributed generation resource installed in conjunction with power failure load point and power distribution network access point
The power output model of cloth power supply determines the power output and load power of the distributed generation resource, and big in the power output of distributed generation resource
When load power, step 6 is gone to, when the power output of distributed generation resource is not more than load power, goes to step 8；
The load point number of stoppages is added 1 by step 6, and power off time is the time that distributed generation resource puts into operation；
The TTF of each element and TTR are added to calculating time t by step 7, and when t is less than setting value, go to step
2, when t is not less than setting value, go to step 10；
In step 8, the load point number of stoppages is added to 1, power off time is the repair time of fault element, goes to step 10；
The load point number of stoppages is added 1 by step 9, and power off time is the breaker operator time；
Step 10, each load point of power distribution network of output access distributed generation resource entirely calculates the frequency of power cut of time and stops
The electric time, and average to obtain the annual power off time of each load point.
Further, the power failure cost-element determines distribution according to the average annual power off time of each load point of the power distribution network
The power failure cost of net, its calculation formula is:
In formula, n is distribution network load number of nodes, tiIt is the year power off time of i-th of load point, PiIt is i-th of load point
Load power, ceIt is unit price of power.
Further, the economic model unit includes:
First cost-element is used to calculate the cost of investment C of distributed generation resourceDG, i.e. section to be installed described in power distribution network
The annual cost summation of point construction distributed generation resource, its calculation formula is:
In formula, r is annual cost coefficient, and m is the operation time limit of distributed generation resource planning, NDGFor the to be installed of distributed generation resource
Number of nodes, CiFor the specific investment cost cost of all kinds of distributed generation resources, SDG,iFor the installed capacity of distributed generation resource；
Second cost-element is used to regard as distributed generation resource the load bus of power distribution network, with forward-backward sweep method meter
Calculate power distribution network via net loss expense Closs, its calculation formula is:
In formula, t is power distribution network circuitry number, Ploss,iIt is the via net loss of i-th branch, τmaxBe the year of i-th branch most
Hourage, c is lost in big loadeIt is unit price of power；
Model determination unit is used for using the annual operating and maintenance cost of power distribution network as general objective, according to the distributed electrical of power distribution network
Cost of investment, via net loss expense and the reliability cost in source establish the economy of the power distribution network operation of access distributed generation resource
Model, calculation formula are as follows:
minZcost=CDG+Closs+CD
In formula, ZcostIt is the year overall cost for accessing the power distribution network after distributed generation resource, CDGIt is being averaged for distributed generation resource
Year cost of investment, ClossIt is the power distribution network average year via net loss expense accessed after distributed generation resource, CDIt is access distributed generation resource
The year power failure cost of power distribution network afterwards.
Further, the configuration unit includes:
Condition setting unit is used to assess economical with assessment in the distribution network reliability of access distributed generation resource
Property unrelated index Multiobjective programming models as the power distribution network of access distributed generation resource of model and economy model, and set
Two kinds of constraint conditions of equality constraint and inequality constraints that the power distribution network that setting makes to access distributed generation resource operates normally, wherein institute
State equality constraint be power distribution network trend constraint, inequality constraints include power distribution network node voltage constraint, line current constraint,
Line transmission power constraint and the constraint of distributed generation resource amount；
Determination unit is configured, is used to encode the distributed generation resource for intending access in power distribution network using integer mode, will lose
The chromosome coding length of propagation algorithm is set as the type of distributed generation resource and the installation site of distributed generation resource and two sections of capacity
The allocation optimum for intending the distributed generation resource of access in power distribution network is determined afterwards, in which:
The type of distributed generation resource is encoded to randint (1, n, [0,1]), can voluntarily provide that 0 or 1 represents photovoltaic or wind
Machine, n are distributed generation resource number to be installed；
Distributed generation resource installation site and capacity are encoded to randint (1, d, [1, n]), wherein d are as follows:
D=floor (PDGmax/DGmin)
PDGmax is the corresponding power of the distributed generation resource installed capacity upper limit that power distribution network allows in formula, and DGmin is distribution
Formula power supply minimum installed capacity；
Chromosome coding are as follows:
X=[randint (1, n, [0,1]) randint (1, d, [1, n])].
Configuration verification unit is used for the allocation optimum according to the distributed generation resource for intending access in determining power distribution network, right
Distributed generation resource and the power supply reliability and economy after addition distributed generation resource are not added than analysis power distribution network, matches described in determination
Promotion of the allocation optimum of distributed generation resource to distribution network reliability and economy is accessed in power grid.
The method and system of the configuration and assessment of the determination Distributed Generation in Distribution System that technical solution of the present invention provides,
Consider to carry out distributing rationally for power distribution network distributed generation resource under conditions of distribution network reliability and economy, the method and
System goes out system branch via net loss, node voltage and load point reliability effect from distributed generation resource access power distribution network
Hair establishes the power output model of distributed generation resource, establishes the index body of the distribution network reliability of assessment access distributed generation resource
The model of system and each index carries out the power failure of load point year with power distribution network of the timing Monte Carlo method to access distributed generation resource
The quantitative calculating of time carries out the calculating of via net loss, and root with power distribution network of the forward-backward sweep method to access distributed generation resource
The power distribution network of access distributed generation resource is established according to the cost of investment of the via net loss of power distribution network, power failure cost and distributed generation resource
Economy model, and assessment is accessed to index unrelated with assessment economy in the distribution network reliability of distributed generation resource
The Multiobjective programming models of model and economy model as the power distribution network of access distributed generation resource, carry out mould using genetic algorithm
Type solves, and optimizes while realizing distributed electrical Source Type, position and access capacity, and according to access quasi- in determining power distribution network
Distributed generation resource allocation optimum, comparative analysis power distribution network be not added distributed generation resource and be added distributed generation resource after power supply
Reliability and economy determine and access the allocation optimum of distributed generation resource in the power distribution network to distribution network reliability and warp
The promotion of Ji property.Method and apparatus of the present invention have the advantages that
1. the New Set and index calculating method of the distribution network reliability assessment after access distributed generation resource are proposed,
The influence after distributed generation resource accesses to distribution network reliability is quantified.
2. chromosome coding, which is different from traditional distributed generation resource, plans coding, the installation of distributed generation resource is not only allowed for
Capacity, and count and the Setup Type of distributed generation resource.Thus the chromosome that coding mode generates can be clearly seen that respectively
The distributed electrical Source Type and installed capacity of a node installation.
3, index unrelated with assessment economy in the distribution network reliability by the way that access distributed generation resource will be assessed
Multiobjective programming models as the power distribution network of access distributed generation resource of model and economy model, and obtained using genetic algorithm
The allocation optimum of Multiobjective programming models out has the power supply reliability for the power distribution network for accessing distributed generation resource and economy
It is obviously improved.
Detailed description of the invention
By reference to the following drawings, exemplary embodiments of the present invention can be more fully understood by:
Fig. 1 is the process according to the method for the configuration of the determination Distributed Generation in Distribution System of the preferred embodiment for the present invention
Figure；
Fig. 2 is the wind speed probability density curve schematic diagram according to the obedience Weibull distribution of the preferred embodiment for the present invention；
Fig. 3 is to be illustrated according to the intensity of illumination probability density curve for obeying beta distribution of the preferred embodiment for the present invention
Figure；
Fig. 4 is to determine matching for access distributed generation resource with timing Monte Carlo method according to the preferred embodiment for the present invention
The flow diagram of each load point annual power off time of power grid；
Fig. 5 is four main feeders according to the practical topology in the somewhere Ji Bei power distribution network of the preferred embodiment for the present invention
End access photovoltaic generating system structure chart.
Fig. 6 is to be shown according to the system structure of the configuration of the determination Distributed Generation in Distribution System of the preferred embodiment for the present invention
It is intended to.
Specific embodiment
Exemplary embodiments of the present invention are introduced referring now to the drawings, however, the present invention can use many different shapes
Formula is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be at large and fully disclose
The present invention, and the scope of the present invention is sufficiently conveyed to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached
Icon note.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The context of related fields has consistent meaning, and is not construed as Utopian or too formal meaning.
Fig. 1 is the process according to the method for the configuration of the determination Distributed Generation in Distribution System of the preferred embodiment for the present invention
Figure.As shown in Figure 1, the method 100 of the configuration of determining Distributed Generation in Distribution System of the present invention is since step 101.
In step 101, the power output model of the distributed generation resource accessed in power distribution network is established, wherein the distributed generation resource
Including wind generator system and photovoltaic generating system.
Preferably, the power output model for establishing the distributed generation resource accessed in power distribution network includes:
It is established according to the actual wind speed data of the wind generator system their location of the quasi- access of power distribution network and obeys Weibull point
The Wind speed model of cloth.
In the preferred embodiment, it is built with the wind speed that the somewhere Ji Bei actual wind speed data obey Weibull distribution
Mould, probability density function are as follows:
In formula, v indicates wind speed, and k, c are the form parameter and scale parameter of the Weibull distribution of two parameter, σ respectivelywindIt is
The standard deviation of wind speed, EwindIt is the average value of wind speed.
Fig. 2 is the wind speed probability density curve schematic diagram according to the obedience Weibull distribution of the preferred embodiment for the present invention.
It is 2.21m/s that Fig. 2, which show and surveys wind speed average value when the somewhere Ji Bei, wind speed probability density when standard deviation is 1.45m/s
Curve graph.
The power output model P of wind generator system is established according to the Wind speed model for obeying Weibull distributionWTG(v) meter
Calculate formula are as follows:
In formula, vci, vcr, vcoRespectively cut wind speed, rated wind speed and cut-out wind speed, prFor wind generator system blower
Rated output power, when wind speed be less than vciWhen, blower is not run；When wind speed is in vciWith vcrBetween when, blower contribute with wind
Speed increasing and increase, approximation be in a curve；When wind speed is greater than vcrAnd it is less than vcoWhen, blower power output is rated value；Work as wind speed
Greater than vcoWhen, blower stops working due to safety concerns.
It is established according to the practical intensity of illumination data of the photovoltaic generating system their location of the quasi- access of power distribution network and obeys beta
The intensity of illumination model of distribution.
In the preferred embodiment, obey with the somewhere Ji Bei actual light intensity data the intensity of illumination of beta distribution
Modeling, probability density function are as follows:
In formula, S indicates intensity of illumination, SmaxIndicate intensity of illumination maximum value, α and β are two shapes of beta distribution respectively
Parameter, Γ are Gamma functions, and μ is intensity of illumination average value, and σ is intensity of illumination standard deviation.
Fig. 3 is to be illustrated according to the intensity of illumination probability density curve for obeying beta distribution of the preferred embodiment for the present invention
Figure.It is 170.40w/m that Fig. 3, which show the somewhere Ji Bei actual measurement light intensity average value,2, standard deviation 248.48w/m2Intensity of illumination
Probability density curve figure.
According to the power output model P of the intensity of illumination model foundation photovoltaic generating system of the obedience beta distributionPVG, meter
Calculate formula are as follows:
In formula, S is intensity of illumination, SrFor photovoltaic generating system intensity of illumination rated value, when intensity of illumination is greater than 0 and is less than
When rated value, the power output of photovoltaic increases with the increase of light intensity, and approximation is in a curve；When intensity of illumination is greater than rated value,
Photovoltaic power output reaches nominal output, no longer increases as light intensity increases.
In step 102, the index system of the distribution network reliability of assessment access distributed generation resource is established, wherein institute
When stating the index in index system including 1 index distribution network load point annual power failure relevant to assessment power distribution network economy
Between and several with the unrelated indexs of assessment power distribution network economy.
Preferably, the index system of the distribution network reliability for establishing assessment access distributed generation resource refers to and will divide
Cloth power supply year Generation Rate, year contribute interruption rate, stability bandwidth, isolated island annual power-on time, isolated island annual power supply amount, orphan
It is that the index and distribution network load point annual power off time unrelated with assessment power distribution network economy are made that island annual, which lacks power supply volume,
For the index of the distribution network reliability of assessment access distributed generation resource, wherein distribution network load point annual power off time
Be with the related index of assessment power distribution network economy, distributed generation resource year Generation Rate, contribute in year interruption rate, stability bandwidth, isolated island year
Average power-on time, isolated island annual power supply amount, the scarce power supply volume of isolated island annual are unrelated with assessment power distribution network economy
Index.
In step 103, according to the power output model of the distributed generation resource of power distribution network access, establish and assessment power distribution network economy
The model of unrelated index.
Preferably, the power output model of the distributed generation resource according to power distribution network access is established and assessment power distribution network economy
The model of the unrelated index of property includes:
Distributed generation resource year Generation Rate index GRDG reflection distributed generation resource actual power generation accounts for the specified hair of distributed generation resource
The ratio of electricity, unit %, calculation formula are as follows:
In formula, p (t) is the power generating value of t-th of moment distributed generation resource, PDGNFor the rated output power of distributed generation resource,
T is the total time of distributed generation resource operation；
The interruption degree for interruption rate index PIPDG reflection distributed generation resource power output of contributing in distributed generation resource year, and the index
Value has the power supply reliability of isolated island and significantly influences, unit %, and calculation formula is as follows:
In formula, T indicates that the operation time limit of distributed generation resource, ∑ t { p (t)=0 } indicate the distributed generation resource in the operation time limit
Set at the time of power output is 0；
Distributed generation resource stability bandwidth index PFDG passes through the Difference Calculation of previous moment and later moment in time, when obtaining entire T
The fluctuation situation of distributed generation resource power output, can effectively reflect the fluctuating change of distributed power source output power in section, unit %,
Calculation formula is as follows:
In formula, P (t) is the activity of force that goes out of t moment distributed generation resource, and P (t+1) is the power output of t+1 moment distributed generation resource
Power；
Isolated island annual power-on time APSTI reflects the annual power-off condition of major network, and orphan when reflection major network failure
The annual powers duration on island, calculation formula are as follows:
In above formula, YEAR is the emulation time limit, and i is load point, PL,iFor the demand power of load point i, PDG is distributed electrical
The output power in source, N are the number of isolated island normal power supply, RjRegion, t are divided for the isolated island under jth time island statejFor jth time
Power-on time when isolated island normal power supply；
Isolated island annual power supply amount AESI reflects that the power supply capacity of isolated island, calculation formula are as follows in terms of electricity supports:
In formula, YEAR is the emulation time limit, and N is the number for emulating isolated island normal power supply in time limit YEAR, EjIt is lonely for jth time
The power supply amount when normal power supply of island, RjRegion, P are divided for the isolated island under jth time island stateL,iFor i-th of load in isolated island
The power of point, tjPower-on time when isolated island normal power supply secondary for jth；
Isolated island annual lacks the power supply capacity that power supply volume AENSI reflects isolated island in terms of electricity vacancy, and calculation formula is as follows:
In formula, YEAR is the emulation time limit, NlossFor the insufficient number of island power supply, Eloss,jWhen having a power failure for jth time isolated island
Scarce power supply volume, RjRegion, P are divided for the isolated island under jth time island stateL,iFor the power of i-th of load point in isolated island,
tloss,jFor the power off time of jth time isolated island.
In step 104, according to the fault model of element in the power output model of the power distribution network distributed generation resource, power distribution network,
The each load point annual power off time of power distribution network is determined with timing Monte Carlo method.
Fig. 4 is to determine matching for access distributed generation resource with timing Monte Carlo method according to the preferred embodiment for the present invention
The flow diagram of each load point annual power off time of power grid.As shown in figure 4, according to the power distribution network distributed generation resource
The fault model of element, determines each load point annual of power distribution network with timing Monte Carlo method in power output model, power distribution network
Power off time step is since step 401.
In step 401, setting calculates each load point annual power off time of the power distribution network of access distributed generation resource
Initial time t=0.
In step 402, (0,1) random number is generated to all elements of power distribution network, is asked according to element fault probability distribution function
The normal working hours TTF of each element out.
Exponential distribution trend, fault model is presented in the Failure probability distribution of element at any time in power distribution network are as follows:
F (t)=1-e-λt
In formula, F (t) is the probability of malfunction of element, and λ is the failure rate of element at any time, and the failure rate of element is normal herein
Number.
In step 403, taking the smallest element of TTF is fault element, (0,1) random number is generated to fault element, according to event
Hinder the repair time TTR that repairing model calculates fault element.
The repair time of element is similar with the Failure probability distribution of element, also obeys exponential distribution, fault restoration model are as follows:
FD(t)=1-e-μt
In formula, FDIt (t) is probability corresponding to element repair time, μ is the repair rate of element, herein the repair rate of element
For constant.
In step 404, the load point for being influenced and being had a power failure by fault element is determined, and judge whether power failure load point can be by leading
Net breaker restores electricity, and when power failure load point cannot be restored electricity by major network breaker, goes to step 405, negative when having a power failure
When lotus point can be restored electricity by major network breaker, step 409 is gone to；
In step 405, connect in conjunction with the type and installed capacity and power distribution network of the distributed generation resource of power failure load point installation
The power output model for entering distributed generation resource determines the power output and load power of the distributed generation resource, and going out in distributed generation resource
When power is greater than load power, step 406 is gone to, when the power output of distributed generation resource is not more than load power, goes to step 408；
In step 406, the load point number of stoppages is added 1, power off time is the time that distributed generation resource puts into operation；
In step 407, the TTF of each element and TTR are added to and calculate time t, and when t is less than setting value, gone to
Step 402, when t is not less than setting value, step 410 is gone to；
In step 8, the load point number of stoppages is added 1, power off time is the repair time of fault element, goes to step
410；
In step 409, the load point number of stoppages is added 1, power off time is the breaker operator time；
The frequency of power cut of time is entirely calculated in each load point of power distribution network of step 410, output access distributed generation resource
With power off time, and average to obtain the annual power off time of each load point.
After the different location access distributed generation resource in the practical topology of the power distribution network of quasi- access distributed generation resource, according to
The process determines influence of the average annual power off time of each load point to distribution network reliability.In the practical topology of power distribution network
The position of middle access distributed generation resource is divided into two kinds of situations: the first situation is the different positions that distributed generation resource accesses same feeder line
It sets, second situation is that distributed generation resource accesses different feeder terminals.It is carried out based on practical topology and distribution network data distributed
The average annual power off time of each load point when plant-grid connection different location calculates, and the calculating data of different situations are compared
Compared with, it can be deduced that photovoltaic generating system accesses the end of feeder line, and each average annual power off time of load point is minimum, distribution network reliability
It is promoted most obvious.
After accessing the distributed generation resource of different capabilities in the practical topology of the power distribution network of quasi- access distributed generation resource, according to
The process determines the average annual power off time of each load point of power distribution network.
Fig. 5 is four main feeders according to the practical topology in the somewhere Ji Bei power distribution network of the preferred embodiment for the present invention
End access photovoltaic generating system structure chart.As shown in figure 5, the power distribution network it is main topology in four main feeders end
After terminating photovoltaic generating system, change the permeability of the photovoltaic generating system of access, calculates separately each load point and stop every year
The electric time, and compare calculated result and obtain, the inflection point that photovoltaic accesses permeability is 10%, saturation point 30%, i.e., with access
Permeability is gradually increased, and each average annual power off time of load point is smaller, and power supply reliability is gradually increased；When photovoltaic permeability is small
When 10%, power supply reliability improves fast speed；When accessing permeability greater than 30%, power supply reliability promotes speed and becomes
It is slow.The inflection point of blower permeability is 30%, saturation point 50%.
In step 104, the power failure cost of power distribution network is determined according to the average annual power off time of each load point of the power distribution network.
Preferably, the power failure cost that power distribution network is determined according to the average annual power off time of each load point of the power distribution network,
Its calculation formula is:
In formula, n is distribution network load number of nodes, tiIt is the year power off time of i-th of load point, PiIt is i-th of load point
Load power, ceIt is unit price of power.
In step 106, using the annual operating and maintenance cost of power distribution network as general objective, according to the investment of the distributed generation resource of power distribution network at
Originally, via net loss expense and power failure cost establish the economy model of the power distribution network operation of access distributed generation resource.
Preferably, described using the annual operating and maintenance cost of power distribution network as general objective, according to the investment of the distributed generation resource of power distribution network
The economy model that cost, via net loss expense and power failure cost establish the power distribution network operation of access distributed generation resource includes:
Calculate the cost of investment C of distributed generation resourceDG, i.e. year of the construction of node to be installed described in power distribution network distributed generation resource
Expense summation, its calculation formula is:
In formula, r is annual cost coefficient, and m is the operation time limit of distributed generation resource planning, NDGFor the to be installed of distributed generation resource
Number of nodes, CiFor the specific investment cost cost of all kinds of distributed generation resources, SDG,iFor the installed capacity of distributed generation resource；
The load bus that distributed generation resource is regarded as to power distribution network calculates power distribution network via net loss expense with forward-backward sweep method
Closs, its calculation formula is:
In formula, t is power distribution network circuitry number, Ploss,iIt is the via net loss of i-th branch, τmaxBe the year of i-th branch most
Hourage, c is lost in big loadeIt is unit price of power；
Using the annual operating and maintenance cost of power distribution network as general objective, damaged according to the cost of investment of the distributed generation resource of power distribution network, network
It expends use and reliability cost establishes the economy model that the power distribution network of access distributed generation resource is run, calculation formula is such as
Under:
minZcost=CDG+Closs+CD
In formula, ZcostIt is the year overall cost for accessing the power distribution network after distributed generation resource, CDGIt is being averaged for distributed generation resource
Year cost of investment, ClossIt is the power distribution network average year via net loss expense accessed after distributed generation resource, CDIt is access distributed generation resource
The year power failure cost of power distribution network afterwards.
The economy of distributed generation resource access power distribution network different location is calculated according to the economy model.By 300kW light
Volt be respectively connected to the somewhere Ji Bei distribution host described in Fig. 5 topology in four main feeders head, in, end, using in step
Calculation method in 105 obtains year power failure cost, via net loss is calculated using forward-backward sweep method, and then according to the economy
Property model calculate distributed generation resource access power distribution network different location economy, and by calculated result obtain distributed generation resource access
Feeder terminal economy is greater than access feeder line middle-end, and the economy of access feeder line middle-end is greater than access head end.
The economy of the distributed generation resource access power distribution network of different capabilities is calculated according to the economy model.By 100kW,
200kW, 300kW photovoltaic are respectively connected to the end of four main feeders in the topology of the somewhere Ji Bei distribution host described in Fig. 5, and root
Respective economy is calculated according to the economy model of the power distribution network of the access distributed generation resource, and is obtained by comparison of computational results
With the increase of distributed generation resource capacity, distributed generation resource investment increases therewith, but distribution network reliability cost and via net loss
Cost constantly reduces.It is then desired to which the capacity to distributed generation resource is planned, so that the economy of power distribution network is optimal.
In step 107, by the distribution network reliability of the assessment access distributed generation resource with assessment economy without
Multiobjective programming models of the model and economy model of the index of pass as the power distribution network of access distributed generation resource, in setting
Under constraint condition, the allocation optimum of distributed generation resource access power distribution network is determined using genetic algorithm, and power distribution network is not accessed point
Cloth power supply with access distributed generation resource after power supply reliability and economy compare and analyze.
Preferably, the performance driving economy model of the power distribution network that will access distributed generation resource is as access distributed generation resource
Power distribution network Multiobjective programming models, under the constraint condition of setting, using genetic algorithm determine distributed generation resource access match
The allocation optimum of power grid, and do not access distributed generation resource to power distribution network and access the power supply reliability and economy after distributed generation resource
Property compares and analyzes
The performance driving economy model of the power distribution network of distributed generation resource will be accessed as the power distribution network of access distributed generation resource
Multiobjective programming models, and equality constraint and inequality constraints that the power distribution network for making to access distributed generation resource operates normally are set
Two kinds of constraint conditions, wherein the equality constraint is the trend constraint of power distribution network, and inequality constraints includes the node electricity of power distribution network
Pressure constraint, line current constraint, line transmission power constraint and the constraint of distributed generation resource amount, specifically:
The trend constraint of power distribution network are as follows:
In formula, PiAnd QiIt is the active power and reactive power of the injection of power distribution network node i, U respectivelyiAnd UjIt is node i respectively
With the voltage magnitude of node j, GijAnd BijIt is the real and imaginary parts of node admittance matrix, δ respectivelyijIt is between node i and node j
Phase angle difference；
The node voltage of power distribution network constrains are as follows:
0.93UN≤Ui≤1.07UN
In formula, UNIt is node voltage rating, UiIt is the amplitude of node voltage；
Line current constraint are as follows:
Il≤Il,max
In formula, IlIt is the current value that route l is flowed through, Il,maxRoute l allow by current maxima.
Line transmission power constraint are as follows:
0≤Sij≤Sij,max
In formula, SijIt is the power of route ij transmission, Sij,maxIt is the rated power that route ij allows to transmit.
Distributed generation resource capacity-constrained are as follows:
0≤PDG,i≤PDG,imax
0≤S∑DG≤Smax
P in formulaDG,iIt is the distributed generation resource capacity of i-th of node installation in power distribution network, PDG,imaxIt is that node i allows to access
The maximum capacity of distributed generation resource, S∑DGIt is the total amount of power distribution network installation distributed generation resource capacity, SmaxIt is that power distribution network allows to install
The maximum size of distributed generation resource.
The distributed generation resource for intending access in power distribution network is encoded using integer mode, the chromosome coding of genetic algorithm is long
Degree determines quasi- access in power distribution network after being set as the type of distributed generation resource and the installation site of distributed generation resource and two sections of capacity
Distributed generation resource allocation optimum, in which:
The type of distributed generation resource is encoded to randint (1, n, [0,1]), can voluntarily provide 0 or 1 represent photovoltaic or
Blower, n are distributed generation resource number to be installed；
Distributed generation resource installation site and capacity are encoded to randint (1, d, [1, n]), wherein d are as follows:
D=floor (PDGmax/DGmin)=floor (Pload× 20%/DGmin)
PDGmax is the corresponding power of the distributed generation resource installed capacity upper limit that power distribution network allows in formula, and DGmin is distribution
Formula power supply minimum installed capacity, PloadFor the corresponding power of load total capacity；
Chromosome coding are as follows:
X=[randint (1, n, [0,1]) randint (1, d, [1, n])]
When
X=[randint (1, n, [0,1]) randint (1, d, [1, n])]=1 011001000013
312556 12 879 10, stipulated that 0 being blower, 1 being photovoltaic, then this result is 1,3,4,7,12 node installation light
Volt, 2,5,6,8,9,10,11 node installation blowers；The wherein distribution of 1,2,6,7,8,9,10,12 node installation DGmin capacity
Power supply, the distributed generation resource of 3,5 node installation 2*DGmin capacity.
According to the allocation optimum for the distributed generation resource for intending access in determining power distribution network, comparative analysis power distribution network is not added point
Cloth power supply and the power supply reliability and economy being added after distributed generation resource, determine in the power distribution network and access distributed generation resource
Promotion of the allocation optimum to distribution network reliability and economy.
In the preferred embodiment, it to the power distribution network in the somewhere Ji Bei, conventionally calculates and does not access distribution
The reliability and economy of power supply, and the reliability and economy of access distributed generation resource are calculated according to the method described in the present invention
Property, it is analyzed and is compared respectively, the power supply reliability and via net loss of the power distribution network after accessing distributed generation resource obtain
To improvement, reduces the investment in terms of conventional electrical distribution net via net loss and power supply reliability, improve the economy of power distribution network operation
Property.
Fig. 6 is to be shown according to the system structure of the configuration of the determination Distributed Generation in Distribution System of the preferred embodiment for the present invention
It is intended to, as shown in fig. 6, the system 600 of the configuration of determination Distributed Generation in Distribution System described in the preferred embodiment for the present invention
Include:
Power output model unit 601, is used to establish the power output model of the distributed generation resource accessed in power distribution network, wherein institute
Stating distributed generation resource includes wind generator system and photovoltaic generating system；
Index determination unit 602 is used to establish the index of the distribution network reliability of assessment access distributed generation resource
System, wherein the index in the index system includes 1 index distribution network load point relevant to assessment power distribution network economy
Annual power off time and several indexs unrelated with assessment power distribution network economy；
Index model unit 603, the power output model for the distributed generation resource for being used to be accessed according to power distribution network are established and are assessed
The model of the unrelated index of power distribution network economy；
Power off time unit 604 is used for the power output model according to the power distribution network distributed generation resource, element in power distribution network
Fault model, determine each load point annual power off time of power distribution network with timing Monte Carlo method；
Power failure cost-element 605 is used to determine power distribution network according to the average annual power off time of each load point of the power distribution network
Power failure cost；
Economic model unit 606 is used for using the annual operating and maintenance cost of power distribution network as general objective, according to the distribution of power distribution network
Cost of investment, via net loss expense and the power failure cost of power supply establish the economy of the power distribution network operation of access distributed generation resource
Model；
Configuration unit 607 is used to access the assessment in the distribution network reliability of distributed generation resource and assessment
Multiobjective programming models of the model and economy model of the unrelated index of economy as the power distribution network of access distributed generation resource,
Under the constraint condition of setting, the allocation optimum of distributed generation resource access power distribution network is determined using genetic algorithm, and to power distribution network
Do not access distributed generation resource with access distributed generation resource after power supply reliability and economy compare and analyze.
Preferably, the power output model unit 601 includes:
First power output model unit 611 is used for the reality of the wind generator system their location according to the quasi- access of power distribution network
Border air speed data establishes the Wind speed model for obeying Weibull distribution, and establishes going out for wind generator system according to the Wind speed model
Power model PWTG(v), its calculation formula is；
In formula, vci, vcr, vcoRespectively cut wind speed, rated wind speed and cut-out wind speed, prFor wind generator system blower
Rated output power, when wind speed be less than vciWhen, blower is not run；When wind speed is in vciWith vcrBetween when, blower contribute with wind
Speed increasing and increase, approximation be in a curve；When wind speed is greater than vcrAnd it is less than vcoWhen, blower power output is rated value；Work as wind speed
Greater than vcoWhen, blower stops working due to safety concerns；
Second power output model unit 612 is used for the reality of the photovoltaic generating system their location according to the quasi- access of power distribution network
Border intensity of illumination data establish the intensity of illumination model for obeying beta distribution, and are sent out according to the intensity of illumination model foundation photovoltaic
The power output model P of electric systemPVG, its calculation formula is:
In formula, S is intensity of illumination, SrFor photovoltaic generating system intensity of illumination rated value, when intensity of illumination is greater than 0 and is less than
When rated value, the power output of photovoltaic increases with the increase of light intensity, and approximation is in a curve；When intensity of illumination is greater than rated value,
Photovoltaic power output reaches nominal output, no longer increases as light intensity increases.
Preferably, the index determination unit 602 by distributed generation resource year Generation Rate, year contribute interruption rate, stability bandwidth, orphan
Island annual power-on time, isolated island annual power supply amount, isolated island annual lack power supply volume be with assessment power distribution network economy without
Distribution network reliability of index and distribution network load the point annual power off time of pass as assessment access distributed generation resource
Index, wherein distribution network load point annual power off time is and the related index of assessment power distribution network economy, distributed electrical
Source year Generation Rate, year power output interruption rate, stability bandwidth, isolated island annual power-on time, isolated island annual power supply amount, isolated island year are flat
Lacking power supply volume is the index unrelated with assessment power distribution network economy.
Preferably, the index model unit 603 includes:
First model unit 631 is used to calculate distributed generation resource year Generation Rate index GRDG, the GRDG reflection point
Cloth power supply actual power generation accounts for the ratio of distributed generation resource rated generation amount, unit %, and calculation formula is as follows:
In formula, p (t) is the power generating value of t-th of moment distributed generation resource, PDGNFor the rated output power of distributed generation resource,
T is the total time of distributed generation resource operation；
Second model unit 632, is used to calculate the interruption rate index PIPDG that contributes in distributed generation resource year, and the PIPDG is anti-
The interruption degree of distributed generation resource power output is reflected, and the index value has the power supply reliability of isolated island and significantly influences, it is single
Position is %, and calculation formula is as follows:
In formula, T indicates that the operation time limit of distributed generation resource, ∑ t { p (t)=0 } indicate the distributed generation resource in the operation time limit
Set at the time of power output is 0；
Third model unit 633, is used to calculate distributed generation resource stability bandwidth index PFDG, and the PFDG passes through previous
The Difference Calculation at moment and later moment in time obtains the fluctuation situation that distributed generation resource in the entire T period is contributed, and can effectively reflect point
The fluctuating change of cloth output power of power supply, unit %, calculation formula are as follows:
In formula, P (t) is the activity of force that goes out of t moment distributed generation resource, and P (t+1) is the power output of t+1 moment distributed generation resource
Power；
4th model unit 634, is used to calculate isolated island annual power-on time APSTI, and the APSTI reflects major network
Annual power-off condition, and when reflection major network failure isolated island annual powers duration, calculation formula is as follows:
In above formula, YEAR is the emulation time limit, and i is load point, PL,iFor the demand power of load point i, PDGFor distributed electrical
The output power in source, N are the number of isolated island normal power supply, RjRegion, t are divided for the isolated island under jth time island statejFor jth time
Power-on time when isolated island normal power supply；
5th model unit 635 is used to calculate isolated island annual power supply amount AESI, the isolated island annual power supply electricity
The power supply capacity that AESI reflects isolated island in terms of electricity support is measured, calculation formula is as follows:
In formula, YEAR is the emulation time limit, and N is the number for emulating isolated island normal power supply in time limit YEAR, EjIt is lonely for jth time
The power supply amount when normal power supply of island, RjRegion, P are divided for the isolated island under jth time island stateL,iFor i-th of load in isolated island
The power of point, tjPower-on time when isolated island normal power supply secondary for jth；
6th model unit 636 is used to calculate isolated island annual and lacks power supply volume AENSI, and the isolated island annual, which lacks, to supply
Electricity AENSI reflects that the power supply capacity of isolated island, calculation formula are as follows in terms of electricity vacancy:
In formula, YEAR is the emulation time limit, NlossFor the insufficient number of island power supply, Eloss,jWhen having a power failure for jth time isolated island
Scarce power supply volume, RjRegion, P are divided for the isolated island under jth time island stateL,iFor the power of i-th of load point in isolated island,
tloss,jFor the power off time of jth time isolated island.
Preferably, the power off time unit 604 is according in the power output model of the power distribution network distributed generation resource, power distribution network
The fault model of element determines that each load point annual power off time of power distribution network includes: with timing Monte Carlo method
Step 1, setting calculate the initial of each load point annual power off time of the power distribution network of access distributed generation resource
Moment t=0；
Step 2 generates (0,1) random number to all elements of power distribution network, is found out often according to element fault probability distribution function
The normal working hours TTF of a element；
Step 3 takes the smallest element of TTF to be fault element, generates (0,1) random number to fault element, is repaired according to failure
Multiple model calculates the repair time TTR of fault element；
Step 4 determines the load point for being influenced and being had a power failure by fault element, and judges whether power failure load point can be broken by major network
Road device restores electricity, and when power failure load point cannot be restored electricity by major network breaker, step 5 is gone to, when power failure load point energy
When being restored electricity by major network breaker, step 9 is gone to；
Step 5, type and the installed capacity of the distributed generation resource installed in conjunction with power failure load point and power distribution network access point
The power output model of cloth power supply determines the power output and load power of the distributed generation resource, and big in the power output of distributed generation resource
When load power, step 6 is gone to, when the power output of distributed generation resource is not more than load power, goes to step 8；
The load point number of stoppages is added 1 by step 6, and power off time is the time that distributed generation resource puts into operation；
The TTF of each element and TTR are added to calculating time t by step 7, and when t is less than setting value, go to step
2, when t is not less than setting value, go to step 10；
In step 8, the load point number of stoppages is added to 1, power off time is the repair time of fault element, goes to step 10；
The load point number of stoppages is added 1 by step 9, and power off time is the breaker operator time；
Step 10, each load point of power distribution network of output access distributed generation resource entirely calculates the frequency of power cut of time and stops
The electric time, and average to obtain the annual power off time of each load point.
Preferably, the power failure cost-element 605 is matched according to the average annual power off time determination of each load point of the power distribution network
The power failure cost of power grid, its calculation formula is:
In formula, n is distribution network load number of nodes, tiIt is the year power off time of i-th of load point, PiIt is i-th of load point
Load power, ceIt is unit price of power.
Preferably, the economic model unit 606 includes:
First cost-element 661 is used to calculate the cost of investment C of distributed generation resourceDG, i.e., to be installed described in power distribution network
Node builds the annual cost summation of distributed generation resource, its calculation formula is:
In formula, r is annual cost coefficient, and m is the operation time limit of distributed generation resource planning, NDGFor the to be installed of distributed generation resource
Number of nodes, CiFor the specific investment cost cost of all kinds of distributed generation resources, SDG,iFor the installed capacity of distributed generation resource；
Second cost-element 662 is used to regard as distributed generation resource the load bus of power distribution network, with forward-backward sweep method
Calculate power distribution network via net loss expense Closs, its calculation formula is:
In formula, t is power distribution network circuitry number, Ploss,iIt is the via net loss of i-th branch, τmaxBe the year of i-th branch most
Hourage, c is lost in big loadeIt is unit price of power；
Model determination unit 663 is used for using the annual operating and maintenance cost of power distribution network as general objective, according to the distribution of power distribution network
Cost of investment, via net loss expense and the reliability cost of power supply establish the economy of the power distribution network operation of access distributed generation resource
Property model, calculation formula are as follows:
minZcost=CDG+Closs+CD
In formula, ZcostIt is the year overall cost for accessing the power distribution network after distributed generation resource, CDGIt is being averaged for distributed generation resource
Year cost of investment, ClossIt is the power distribution network average year via net loss expense accessed after distributed generation resource, CDIt is access distributed generation resource
The year power failure cost of power distribution network afterwards.
Preferably, the configuration unit 607 includes:
Condition setting unit 671 is used to assess in the distribution network reliability of access distributed generation resource and assessment
Multiobjective programming models of the model and economy model of the unrelated index of economy as the power distribution network of access distributed generation resource,
And two kinds of constraint conditions of equality constraint and inequality constraints that the power distribution network for making to access distributed generation resource operates normally are set,
In, the equality constraint is the trend constraint of power distribution network, and inequality constraints includes the node voltage constraint of power distribution network, line current
Constraint, line transmission power constraint and the constraint of distributed generation resource amount；
Determination unit 672 is configured, is used to encode the distributed generation resource for intending access in power distribution network using integer mode, it will
The chromosome coding length of genetic algorithm is set as the type of distributed generation resource and the installation site of distributed generation resource and capacity two
The allocation optimum for intending the distributed generation resource of access in power distribution network is determined after section, in which:
The type of distributed generation resource is encoded to randint (1, n, [0,1]), can voluntarily provide 0 or 1 represent photovoltaic or
Blower, n are distributed generation resource number to be installed；
Distributed generation resource installation site and capacity are encoded to randint (1, d, [1, n]), wherein d are as follows:
D=floor (PDGmax/DGmin)
PDGmax is the corresponding power of the distributed generation resource installed capacity upper limit that power distribution network allows in formula, and DGmin is distribution
Formula power supply minimum installed capacity；
Chromosome coding are as follows:
X=[randint (1, n, [0,1]) randint (1, d, [1, n])]；
Configuration verification unit 673 is used for the allocation optimum according to the distributed generation resource for intending access in determining power distribution network,
Comparative analysis power distribution network be not added distributed generation resource and be added distributed generation resource after power supply reliability and economy, determine described in
Promotion of the allocation optimum of distributed generation resource to distribution network reliability and economy is accessed in power distribution network.
The present invention is described by reference to a small amount of embodiment.However, it is known in those skilled in the art, as
Defined by subsidiary Patent right requirement, in addition to the present invention other embodiments disclosed above equally fall in it is of the invention
In range.
Normally, all terms used in the claims are all solved according to them in the common meaning of technical field
It releases, unless in addition clearly being defined wherein.All references " one/described/be somebody's turn to do [device, component etc.] " are all opened
Ground is construed at least one example in described device, component etc., unless otherwise expressly specified.Any method disclosed herein
The step of need not all be run with disclosed accurate sequence, unless explicitly stated otherwise.
Claims (16)
1. a kind of method of the configuration of determining Distributed Generation in Distribution System, which is characterized in that the described method includes:
Establish the power output model of the distributed generation resource accessed in power distribution network, wherein the distributed generation resource includes wind-power electricity generation system
System and photovoltaic generating system；
Establish the index system of the distribution network reliability of assessment access distributed generation resource, wherein in the index system
Index include 1 with assess the relevant index distribution network load point annual power off time of power distribution network economy and several with comment
Estimate the unrelated index of power distribution network economy；
According to the power output model of the distributed generation resource of power distribution network access, the mould of the index unrelated with assessment power distribution network economy is established
Type；
According to the fault model of element in the power output model of the power distribution network distributed generation resource, power distribution network, with timing Meng Teka
Lip river method determines each load point annual power off time of power distribution network；
The power failure cost of power distribution network is determined according to the average annual power off time of each load point of the power distribution network；
Using the annual operating and maintenance cost of power distribution network as general objective, taken according to the cost of investment of the distributed generation resource of power distribution network, via net loss
With and power failure cost establish access distributed generation resource power distribution network operation economy model；
By the model of index unrelated with assessment economy in the distribution network reliability of the assessment access distributed generation resource
Multiobjective programming models with economy model as the power distribution network of access distributed generation resource, under the constraint condition of setting, benefit
It determines that distributed generation resource accesses the allocation optimum of power distribution network with genetic algorithm, and does not access distributed generation resource and access to power distribution network
Power supply reliability and economy after distributed generation resource compare and analyze.
2. the method according to claim 1, wherein described establish going out for the distributed generation resource accessed in power distribution network
Power model includes:
It is established according to the actual wind speed data of the wind generator system their location of the quasi- access of power distribution network and obeys Weibull distribution
Wind speed model, and establish according to the Wind speed model power output model P of wind generator systemWTG(v), its calculation formula is；
In formula, vci, vcr, vcoRespectively cut wind speed, rated wind speed and cut-out wind speed, prFor the specified of wind generator system blower
Output power, when wind speed is less than vciWhen, blower is not run；When wind speed is in vciWith vcrBetween when, blower contribute with wind speed plus
It increases greatly, approximation is in a curve；When wind speed is greater than vcrAnd it is less than vcoWhen, blower power output is rated value；When wind speed is greater than vco
When, blower stops working due to safety concerns；
It is established according to the practical intensity of illumination data of the photovoltaic generating system their location of the quasi- access of power distribution network and obeys beta distribution
Intensity of illumination model, and according to the power output model P of the intensity of illumination model foundation photovoltaic generating systemPVG, calculation formula
Are as follows:
In formula, S is intensity of illumination, SrFor photovoltaic generating system intensity of illumination rated value, when intensity of illumination is greater than 0 and is less than specified
When value, the power output of photovoltaic increases with the increase of light intensity, and approximation is in a curve；When intensity of illumination is greater than rated value, photovoltaic
Power output reaches nominal output, no longer increases as light intensity increases.
3. the method according to claim 1, wherein the power distribution network for establishing assessment access distributed generation resource supplies
The index system of electric reliability refers to distributed generation resource year Generation Rate, year power output interruption rate, stability bandwidth, isolated island annual power supply
Time, isolated island annual power supply amount, the scarce power supply volume of isolated island annual are and assess the unrelated index of power distribution network economy and match
Index of the network load point annual power off time as the distribution network reliability of assessment access distributed generation resource, wherein
Distribution network load point annual power off time be with the related index of assessment power distribution network economy, distributed generation resource year Generation Rate,
Year power output interruption rate, stability bandwidth, isolated island annual power-on time, isolated island annual power supply amount, isolated island annual lack power supply volume
It is the index unrelated with assessment power distribution network economy.
4. according to the method described in claim 3, it is characterized in that, the power output of the distributed generation resource according to power distribution network access
Model, the model for establishing the index unrelated with assessment power distribution network economy include:
Distributed generation resource year Generation Rate index GRDG reflection distributed generation resource actual power generation accounts for distributed generation resource rated generation amount
Ratio, unit %, calculation formula is as follows:
In formula, p (t) is the power generating value of t-th of moment distributed generation resource, PDGNFor the rated output power of distributed generation resource, T is
The total time of distributed generation resource operation；
The interruption degree for interruption rate index PIPDG reflection distributed generation resource power output of contributing in distributed generation resource year, and the index value pair
Having in the power supply reliability of isolated island significantly influences, unit %, and calculation formula is as follows:
In formula, T indicates that the operation time limit of distributed generation resource, ∑ t { p (t)=0 } indicate the distributed generation resource power output in the operation time limit
Set at the time of being 0；
Distributed generation resource stability bandwidth index PFDG passes through the Difference Calculation of previous moment and later moment in time, obtains in the entire T period
The fluctuation situation of distributed generation resource power output, can effectively reflect the fluctuating change of distributed power source output power, and unit % is calculated
Formula is as follows:
In formula, P (t) is the activity of force that goes out of t moment distributed generation resource, and P (t+1) is the activity of force out of t+1 moment distributed generation resource；
Isolated island annual power-on time APSTI reflects the annual power-off condition of major network, and isolated island when reflection major network failure
Annual powers duration, calculation formula are as follows:
In above formula, YEAR is the emulation time limit, and i is load point, PL, iFor the demand power of load point i, PDGFor the defeated of distributed generation resource
Power out, N are the number of isolated island normal power supply, RjRegion, t are divided for the isolated island under jth time island statejJust for jth time isolated island
Often power-on time when power supply；
Isolated island annual power supply amount AESI reflects that the power supply capacity of isolated island, calculation formula are as follows in terms of electricity supports:
In formula, YEAR is the emulation time limit, and N is the number for emulating isolated island normal power supply in time limit YEAR, EjIt is normal for jth time isolated island
Power supply amount when power supply, RjRegion, P are divided for the isolated island under jth time island stateL, iFor the function of i-th of load point in isolated island
Rate, tjPower-on time when isolated island normal power supply secondary for jth；
Isolated island annual lacks the power supply capacity that power supply volume AENSI reflects isolated island in terms of electricity vacancy, and calculation formula is as follows:
In formula, YEAR is the emulation time limit, NlossFor the insufficient number of island power supply, ELoss, jScarce confession when having a power failure for jth time isolated island
Electricity, RjRegion, P are divided for the isolated island under jth time island stateL, iFor the power of i-th of load point in isolated island, tLoss, jIt is
The power off time of j isolated island.
5. the method according to claim 1, wherein the power output mould according to the power distribution network distributed generation resource
The fault model of element in type, power distribution network, when determining that each load point annual of power distribution network has a power failure with timing Monte Carlo method
Between include:
Step 1, setting calculate the initial time t of each load point annual power off time of the power distribution network of access distributed generation resource
=0；
Step 2 generates (0,1) random number to all elements of power distribution network, finds out each member according to element fault probability distribution function
The normal working hours TTF of part；
Step 3 takes the smallest element of TTF to be fault element, (0,1) random number is generated to fault element, according to fault restoration mould
The repair time TTR of type calculating fault element；
Step 4 determines the load point for being influenced and being had a power failure by fault element, and judges whether power failure load point can be by major network breaker
It restores electricity, when power failure load point cannot be restored electricity by major network breaker, goes to step 5, when power failure load point can be by leading
When net breaker restores electricity, step 9 is gone to；
Step 5, the type for the distributed generation resource installed in conjunction with power failure load point and installed capacity and power distribution network access are distributed
The power output model of power supply determines the power output and load power of the distributed generation resource, and is greater than in the power output of distributed generation resource and bears
When lotus power, step 6 is gone to, when the power output of distributed generation resource is not more than load power, goes to step 8；
The load point number of stoppages is added 1 by step 6, and power off time is the time that distributed generation resource puts into operation；
The TTF of each element and TTR are added to calculating time t by step 7, and when t is less than setting value, step 2 are gone to, in t
When not less than setting value, step 10 is gone to；
In step 8, the load point number of stoppages is added to 1, power off time is the repair time of fault element, goes to step 10；
The load point number of stoppages is added 1 by step 9, and power off time is the breaker operator time；
Step 10, when each load point of power distribution network of output access distributed generation resource entirely calculates frequency of power cut and the power failure of time
Between, and average to obtain the annual power off time of each load point.
6. the method according to claim 1, wherein described have a power failure every year according to each load point of the power distribution network
Time determines the power failure cost of power distribution network, its calculation formula is:
In formula, n is distribution network load number of nodes, tiIt is the year power off time of i-th of load point, PiIt is the load of i-th of load point
Power, ceIt is unit price of power.
7. according to the method described in claim 6, it is characterized in that, described using the annual operating and maintenance cost of power distribution network as general objective, root
Matching for access distributed generation resource is established according to the cost of investment of the distributed generation resource of power distribution network, via net loss expense and power failure cost
The economy model of operation of power networks includes:
Calculate the cost of investment C of distributed generation resourceDG, i.e. the annual cost of the construction of node to be installed described in power distribution network distributed generation resource
Summation, its calculation formula is:
In formula, r is annual cost coefficient, and m is the operation time limit of distributed generation resource planning, NDGFor the node to be installed of distributed generation resource
Number, CiFor the specific investment cost cost of all kinds of distributed generation resources, SDG, iFor the installed capacity of distributed generation resource；
The load bus that distributed generation resource is regarded as to power distribution network calculates power distribution network via net loss expense C with forward-backward sweep methodloss,
Its calculation formula is:
In formula, t is power distribution network circuitry number, PLoss, iIt is the via net loss of i-th branch, τmaxBe i-th branch year maximum it is negative
Hourage, c is lost in lotuseIt is unit price of power；
Using the annual operating and maintenance cost of power distribution network as general objective, taken according to the cost of investment of the distributed generation resource of power distribution network, via net loss
With and reliability cost establish access distributed generation resource power distribution network operation economy model, calculation formula is as follows:
minZcost=CDG+Closs+CD
In formula, ZcostIt is the year overall cost for accessing the power distribution network after distributed generation resource, CDGIt is the average year throwing of distributed generation resource
Provide cost, ClossIt is the power distribution network average year via net loss expense accessed after distributed generation resource, CDIt is after accessing distributed generation resource
The year power failure cost of power distribution network.
8. the method according to claim 1, wherein the power distribution network by the assessment access distributed generation resource
Distribution of the model and economy model of the index unrelated with assessment economy as access distributed generation resource in power supply reliability
The Multiobjective programming models of net determine distributed generation resource access power distribution network using genetic algorithm under the constraint condition of setting
Allocation optimum, and do not access distributed generation resource to power distribution network and access the power supply reliability and economy progress after distributed generation resource
Comparative analysis includes:
By the model and warp of index unrelated with assessment economy in the distribution network reliability of assessment access distributed generation resource
Multiobjective programming models of the Ji property model as the power distribution network of access distributed generation resource, and setting makes to access matching for distributed generation resource
Two kinds of constraint conditions of equality constraint and inequality constraints that power grid operates normally, wherein the equality constraint is the tide of power distribution network
Stream constraint, inequality constraints include node voltage constraint, line current constraint, line transmission power constraint and the distribution of power distribution network
The constraint of formula amount；
The distributed generation resource for intending access in power distribution network is encoded using integer mode, the chromosome coding length of genetic algorithm is set
Point for intending access in power distribution network is determined after being set to the type of distributed generation resource and the installation site of distributed generation resource and two sections of capacity
The allocation optimum of cloth power supply, in which:
The type of distributed generation resource is encoded to randint (1, n, [0,1]), can voluntarily provide that 0 or 1 represents photovoltaic or blower, n
For distributed generation resource number to be installed；
Distributed generation resource installation site and capacity are encoded to randint (1, d, [1, n]), wherein d are as follows:
D=floor (PDGmax/DGmin)
PDGmax is the corresponding power of the distributed generation resource installed capacity upper limit that power distribution network allows in formula, and DGmin is distributed electrical
Source minimum installed capacity；
Chromosome coding are as follows:
X=[randint (1, n, [0,1]) randint (1, d, [1, n])]；
According to the allocation optimum for the distributed generation resource for intending access in determining power distribution network, distribution is not added for comparative analysis power distribution network
Power supply and the power supply reliability and economy being added after distributed generation resource, determine in the power distribution network and access distributed generation resource most
Promotion of the excellent configuration to distribution network reliability and economy.
9. a kind of system of the configuration of determining Distributed Generation in Distribution System, which is characterized in that the system comprises:
Power output model unit, is used to establish the power output model of the distributed generation resource accessed in power distribution network, wherein the distribution
Power supply includes wind generator system and photovoltaic generating system；
Index determination unit is used to establish the index system of the distribution network reliability of assessment access distributed generation resource,
In, the index in the index system includes 1 index distribution network load point annual relevant to assessment power distribution network economy
Power off time and several indexs unrelated with assessment power distribution network economy；
Index model unit, the power output model for the distributed generation resource for being used to be accessed according to power distribution network are established and assessment power distribution network
The model of the unrelated index of economy；
Power off time unit, be used for the power output model according to the power distribution network distributed generation resource, in power distribution network element failure
Model determines each load point annual power off time of power distribution network with timing Monte Carlo method；
Power failure cost-element, be used to be determined according to the average annual power off time of each load point of the power distribution network power failure of power distribution network at
This；
Economic model unit is used for using the annual operating and maintenance cost of power distribution network as general objective, according to the distributed generation resource of power distribution network
Cost of investment, via net loss expense and power failure cost establish the economy model of the power distribution network operation of access distributed generation resource；
Configuration unit, be used for by it is described assessment access distributed generation resource distribution network reliability in assessment economy without
Multiobjective programming models of the model and economy model of the index of pass as the power distribution network of access distributed generation resource, in setting
Under constraint condition, the allocation optimum of distributed generation resource access power distribution network is determined using genetic algorithm, and power distribution network is not accessed point
Cloth power supply with access distributed generation resource after power supply reliability and economy compare and analyze.
10. system according to claim 9, which is characterized in that the power output model unit includes:
First power output model unit is used for the actual wind speed number of the wind generator system their location according to the quasi- access of power distribution network
The Wind speed model of Weibull distribution is obeyed according to foundation, and the power output model of wind generator system is established according to the Wind speed model
PWTG(v), its calculation formula is；
In formula, vci, vcr, vcoRespectively cut wind speed, rated wind speed and cut-out wind speed, prFor the specified of wind generator system blower
Output power, when wind speed is less than vciWhen, blower is not run；When wind speed is in vciWith vcrBetween when, blower contribute with wind speed plus
It increases greatly, approximation is in a curve；When wind speed is greater than vcrAnd it is less than vcoWhen, blower power output is rated value；When wind speed is greater than vco
When, blower stops working due to safety concerns；
Second power output model unit is used for strong according to the practical illumination of the photovoltaic generating system their location of the quasi- access of power distribution network
Degree obeys the intensity of illumination model of beta distribution according to establishing, and according to the intensity of illumination model foundation photovoltaic generating system
Contribute model PPVG, its calculation formula is:
In formula, S is intensity of illumination, SrFor photovoltaic generating system intensity of illumination rated value, when intensity of illumination is greater than 0 and is less than specified
When value, the power output of photovoltaic increases with the increase of light intensity, and approximation is in a curve；When intensity of illumination is greater than rated value, photovoltaic
Power output reaches nominal output, no longer increases as light intensity increases.
11. system according to claim 9, which is characterized in that the index determination unit generates electricity distributed generation resource year
Rate, year power output interruption rate, stability bandwidth, isolated island annual power-on time, isolated island annual power supply amount, isolated island annual lack power supply
Amount is the index and distribution network load point annual power off time unrelated with assessment power distribution network economy as assessment access distribution
The index of the distribution network reliability of formula power supply, wherein distribution network load point annual power off time be and assessment power distribution network
The related index of economy, distributed generation resource year Generation Rate, year contribute interruption rate, stability bandwidth, isolated island annual power-on time, orphan
It is the index unrelated with assessment power distribution network economy that island annual power supply amount, isolated island annual, which lack power supply volume,.
12. system according to claim 11, which is characterized in that the index model unit includes:
First model unit, is used to calculate distributed generation resource year Generation Rate index GRDG, and the GRDG reflects distributed generation resource
Actual power generation accounts for the ratio of distributed generation resource rated generation amount, unit %, and calculation formula is as follows:
In formula, p (t) is the power generating value of t-th of moment distributed generation resource, PDGNFor the rated output power of distributed generation resource, T is
The total time of distributed generation resource operation；
Second model unit is used to calculate distributed generation resource year power output interruption rate index PIPDG, the PIPDG reflection distribution
The interruption degree of formula power supply power output, and the index value has the power supply reliability of isolated island and significantly influences, unit %,
Calculation formula is as follows:
In formula, T indicates that the operation time limit of distributed generation resource, ∑ t { p (t)=0 } indicate the distributed generation resource power output in the operation time limit
Set at the time of being 0；
Third model unit is used to calculate distributed generation resource stability bandwidth index PFDG, and the PFDG is by previous moment with after
The Difference Calculation at one moment obtains the fluctuation situation that distributed generation resource is contributed in the entire T period, can effectively reflect distributed generation resource
The fluctuating change of output power, unit %, calculation formula are as follows:
In formula, P (t) is the activity of force that goes out of t moment distributed generation resource, and P (t+1) is the activity of force out of t+1 moment distributed generation resource；
4th model unit is used to calculate isolated island annual power-on time APSTI, the annual of the APSTI reflection major network
Power-off condition, and when reflection major network failure isolated island annual powers duration, calculation formula is as follows:
In above formula, YEAR is the emulation time limit, and i is load point, PL, iFor the demand power of load point i, PDGFor the defeated of distributed generation resource
Power out, N are the number of isolated island normal power supply, RjRegion, t are divided for the isolated island under jth time island statejJust for jth time isolated island
Often power-on time when power supply；
5th model unit is used to calculate isolated island annual power supply amount AESI, the isolated island annual power supply amount AESI
Reflect that the power supply capacity of isolated island, calculation formula are as follows in terms of electricity support:
In formula, YEAR is the emulation time limit, and N is the number for emulating isolated island normal power supply in time limit YEAR, EjIt is normal for jth time isolated island
Power supply amount when power supply, RjRegion, P are divided for the isolated island under jth time island stateL, iFor the function of i-th of load point in isolated island
Rate, tjPower-on time when isolated island normal power supply secondary for jth；
6th model unit is used to calculate isolated island annual and lacks power supply volume AENSI, and the isolated island annual lacks power supply volume
AENSI reflects that the power supply capacity of isolated island, calculation formula are as follows in terms of electricity vacancy:
In formula, YEAR is the emulation time limit, NlossFor the insufficient number of island power supply, ELoss, jScarce confession when having a power failure for jth time isolated island
Electricity, RjRegion, P are divided for the isolated island under jth time island stateL, iFor the power of i-th of load point in isolated island, tLoss, jIt is
The power off time of j isolated island.
13. system according to claim 9, which is characterized in that the power off time unit is distributed according to the power distribution network
The power output model of formula power supply, in power distribution network element fault model, determine each load of power distribution network with timing Monte Carlo method
Putting annual power off time includes:
Step 1, setting calculate the initial time t of each load point annual power off time of the power distribution network of access distributed generation resource
=0；
Step 2 generates (0,1) random number to all elements of power distribution network, finds out each member according to element fault probability distribution function
The normal working hours TTF of part；
Step 3 takes the smallest element of TTF to be fault element, (0,1) random number is generated to fault element, according to fault restoration mould
The repair time TTR of type calculating fault element；
Step 4 determines the load point for being influenced and being had a power failure by fault element, and judges whether power failure load point can be by major network breaker
It restores electricity, when power failure load point cannot be restored electricity by major network breaker, goes to step 5, when power failure load point can be by leading
When net breaker restores electricity, step 9 is gone to；
Step 5, the type for the distributed generation resource installed in conjunction with power failure load point and installed capacity and power distribution network access are distributed
The power output model of power supply determines the power output and load power of the distributed generation resource, and is greater than in the power output of distributed generation resource and bears
When lotus power, step 6 is gone to, when the power output of distributed generation resource is not more than load power, goes to step 8；
The load point number of stoppages is added 1 by step 6, and power off time is the time that distributed generation resource puts into operation；
The TTF of each element and TTR are added to calculating time t by step 7, and when t is less than setting value, step 2 are gone to, in t
When not less than setting value, step 10 is gone to；
In step 8, the load point number of stoppages is added to 1, power off time is the repair time of fault element, goes to step 10；
The load point number of stoppages is added 1 by step 9, and power off time is the breaker operator time；
Step 10, when each load point of power distribution network of output access distributed generation resource entirely calculates frequency of power cut and the power failure of time
Between, and average to obtain the annual power off time of each load point.
14. system according to claim 9, which is characterized in that the power failure cost-element is each according to the power distribution network
The average annual power off time of load point determines the power failure cost of power distribution network, its calculation formula is:
In formula, n is distribution network load number of nodes, tiIt is the year power off time of i-th of load point, PiIt is the load of i-th of load point
Power, ceIt is unit price of power.
15. system according to claim 14, which is characterized in that the economic model unit includes:
First cost-element is used to calculate the cost of investment C of distributed generation resourceDG, i.e. node to be installed described in power distribution network builds
If the annual cost summation of distributed generation resource, its calculation formula is:
In formula, r is annual cost coefficient, and m is the operation time limit of distributed generation resource planning, NDGFor the node to be installed of distributed generation resource
Number, CiFor the specific investment cost cost of all kinds of distributed generation resources, SDG, iFor the installed capacity of distributed generation resource；
Second cost-element is used to regard as distributed generation resource the load bus of power distribution network, matches with forward-backward sweep method calculating
Electricity grid network wear and tear expense Closs, its calculation formula is:
In formula, t is power distribution network circuitry number, PLoss, iIt is the via net loss of i-th branch, τmaxBe i-th branch year maximum it is negative
Hourage, c is lost in lotuseIt is unit price of power；
Model determination unit is used for using the annual operating and maintenance cost of power distribution network as general objective, according to the distributed generation resource of power distribution network
Cost of investment, via net loss expense and reliability cost establish the economy mould of the power distribution network operation of access distributed generation resource
Type, calculation formula are as follows:
minZcost=CDG+Closs+CD
In formula, ZcostIt is the year overall cost for accessing the power distribution network after distributed generation resource, CDGIt is the average year throwing of distributed generation resource
Provide cost, ClossIt is the power distribution network average year via net loss expense accessed after distributed generation resource, CDIt is after accessing distributed generation resource
The year power failure cost of power distribution network.
16. system according to claim 9, which is characterized in that the configuration unit includes:
Condition setting unit, be used to assess access distributed generation resource distribution network reliability in assessment economy without
Multiobjective programming models of the model and economy model of the index of pass as the power distribution network of access distributed generation resource, and setting makes
Access two kinds of constraint conditions of equality constraint and inequality constraints that the power distribution network of distributed generation resource operates normally, wherein described etc.
Formula is constrained to the trend constraint of power distribution network, and inequality constraints includes the node voltage constraint of power distribution network, line current constraint, route
Transimission power constraint and the constraint of distributed generation resource amount；
Determination unit is configured, is used to encode the distributed generation resource for intending access in power distribution network using integer mode, heredity is calculated
The chromosome coding length of method is set as after the type of distributed generation resource and the installation site of distributed generation resource and two sections of capacity really
Determine the allocation optimum for intending the distributed generation resource of access in power distribution network, in which:
The type of distributed generation resource is encoded to randint (1, n, [0,1]), can voluntarily provide that 0 or 1 represents photovoltaic or blower, n
For distributed generation resource number to be installed；
Distributed generation resource installation site and capacity are encoded to randint (1, d, [1, n]), wherein d are as follows:
D=floor (PDGmax/DGmin)
PDGmax is the corresponding power of the distributed generation resource installed capacity upper limit that power distribution network allows in formula, and DGmin is distributed electrical
Source minimum installed capacity；
Chromosome coding are as follows:
X=[randint (1, n, [0,1]) randint (1, d, [1, n])]；
Configuration verification unit is used for the allocation optimum according to the distributed generation resource for intending access in determining power distribution network, to score
The power supply reliability and economy that distributed generation resource is not added and is added after distributed generation resource for analysis power distribution network, determine the power distribution network
Promotion of the allocation optimum of middle access distributed generation resource to distribution network reliability and economy.
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