CN109193817A - A kind of distributed photovoltaic access power distribution network power-carrying calculation method - Google Patents
A kind of distributed photovoltaic access power distribution network power-carrying calculation method Download PDFInfo
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- CN109193817A CN109193817A CN201811414752.7A CN201811414752A CN109193817A CN 109193817 A CN109193817 A CN 109193817A CN 201811414752 A CN201811414752 A CN 201811414752A CN 109193817 A CN109193817 A CN 109193817A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H02J3/383—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
A kind of distributed photovoltaic access power distribution network power-carrying calculation method, it is related to distribution network planning field, power distribution network power-carrying calculation method is accessed more particularly to a kind of distributed photovoltaic, the present invention be in order to solve the prior art is computationally intensive, committed memory is high, expend the longer disadvantage of timing and propose, it include: that the voltage value of each node in uniline main feed route is calculated according to head end voltage；Calculate the accumulation resistance at each node and accumulation reactance；Active power and reactive power at node i are found out according to the voltage value of each node, accumulation resistance and accumulation reactance；The via net loss of i-th of node is found out according to the voltage value of each node, accumulation resistance, accumulation reactance, active power, reactive power；The maximum node of via net loss value is chosen in all nodes accesses photo-voltaic power supply.The present invention is suitable for the determination of power distribution network access point and the determination of power distribution network power-carrying.
Description
Technical field
The present invention relates to distribution network planning fields, and in particular to a kind of distributed photovoltaic access power distribution network power-carrying calculating
Method.
Background technique
With the development of new energy, on-position and the limit access capacity when photo-voltaic power supply is incorporated to distribution are Electric Power Network Plannings
Important component.Existing distributed photovoltaic access power distribution network power-carrying calculation method often have it is computationally intensive, account for
With memory height, expend the longer disadvantage of timing.
For example, thering is electric network impedance directly to calculate in the prior art, enumerative technique, dichotomy method etc..Electric network impedance direct computing method
Usually power system capacity is not very big situation relative to consumer networks capacity, and this calculation method must first know system
Capacity of short circuit, limit it is larger, calculate it is not accurate enough.Enumerative technique and dichotomy are then to preset a photo-voltaic power generation station injection
Power level solves the equation of network trend, if calculation of tidal current meets certain constraint condition, according to enumerative technique or
It is horizontal that person's dichotomy increases photo-voltaic power generation station injecting power, and repeats to iterate to calculate, until photo-voltaic power generation station cannot be further added by
Until injecting power is horizontal, the injecting power level obtained at this time is exactly result to be asked；It can be seen that enumerative technique and dichotomy
Calculation amount is larger, more wheel interative computations is needed to be implemented, it is difficult to ensure that operation efficiency in the biggish situation of data scale.
Such as a kind of new distributed photovoltaic access power distribution network power-carrying calculation method is therefore needed, to solve existing skill
The defect of art.
Summary of the invention
That the purpose of the present invention is to solve the prior arts is computationally intensive, committed memory is high, expends the longer disadvantage of timing,
And propose a kind of distributed photovoltaic access power distribution network power-carrying calculation method, comprising:
Step 1: calculating the voltage value U of each node in uniline main feed route according to head end voltagei；
Step 2: calculating the accumulation resistance R at each nodeΣAnd accumulation reactance XΣ；
Step 3: according to the voltage value U of each nodei, accumulation resistance RΣAnd accumulation reactance XΣIt finds out active at node i
Power PiAnd reactive power Qi；
Step 4: according to the voltage value U of each nodei, accumulation resistance RΣ, accumulation reactance XΣ, active-power Pi, reactive power
QiFind out the via net loss P of i-th of nodei,loss；
Step 5: choosing P in all nodeslossIt is worth maximum node access photo-voltaic power supply.
Further, the detailed process of step 1 are as follows:
Pass through formula
It is calculated；Wherein Ui、Pi、QiVoltage, active power and the reactive power of respectively i-th node；Ui-1、
Pi-1、Qi-1Voltage, active power and the reactive power of respectively (i-1)-th node；Ri,i-1Between node i and node i -1
Resistance；Xi,i-1Reactance between node i and node i -1；
As i=0, U0For head end voltage；P0For the active power of head end；Q0For the reactive power of head end.
Further, the detailed process of step 3 are as follows:
Pass through formula
Carry out calculating solution；WhereinIndicate accumulation resistance；Indicate accumulation reactance.
Further, the detailed process of step 4 are as follows:
Pass through formula
It is calculated.
Further, further includes:
Step 6: carrying out calculating i-th of node place according to the following formula in the case where access point is i-th of node
The access ultimate capacity of branch
Wherein Di-jIndicate branch breaking distribution factor, Δ Pj,max=Pj,max-Pj,min, Pj,minAllow for j-th of branch
Minimum power, Pj,maxThe maximum power allowed for j-th of node；J-th of branch is the branch where i-th of node.
Further, further includes:
Step 7: withValue as limit photovoltaic access capacity.
The invention has the benefit that
The present invention be overcome algorithm in the prior art is computationally intensive, committed memory is high, expend the longer disadvantage of timing,
It include: that the voltage value of each node in uniline main feed route is calculated according to head end voltage；Calculate accumulation resistance at each node and
Accumulate reactance；According to the voltage value of each node, accumulation resistance and accumulates reactance and find out active power at node i and idle
Power；The net of i-th of node is found out according to the voltage value of each node, accumulation resistance, accumulation reactance, active power, reactive power
Network loss；The maximum node of via net loss value is chosen in all nodes accesses photo-voltaic power supply.The present invention connects suitable for power distribution network
The determination of access point and the determination of power distribution network power-carrying.
Specific advantage shows themselves in that 1, calculation amount is smaller, only takes up a small amount of memory；2, what is determined by means of the present invention connects
Access point is pressed with the effect of being obviously improved to line electricity after accessing power supply, advantageously reduces the active loss on route.
Detailed description of the invention
Fig. 1 is the flow chart of one embodiment of the invention；
Fig. 2 is the schematic diagram of 14 node distribution network systems of one embodiment of the invention；
Fig. 3 is the uniline main feed route isoboles of one embodiment of the invention；
Fig. 4 is that the photo-voltaic power supply of the embodiment of the present invention accesses forward and backward node voltage value comparison diagram.
Specific embodiment
Specific embodiment 1: the particular content in order to clearly illustrate present embodiment, first says necessary theory
It is bright:
The present invention be directed to the access point selection strategies that 14 node distribution network systems carry out, and 14 node distribution network systems schematic diagrames are such as
Shown in Fig. 2.
It is contemplated that reasonable on-position can be by using minimal network loss as optimization aim.Via net loss, i.e., it is active
Formula is lost are as follows:
In formula: IiFor the branch current of i-th of subcircuits；RiFor branch resistance；N is total circuitry number in network.By public affairs
Formula (1) can find, via net loss also can accordingly reduce if branch current reduces, thus lower photo-voltaic power supply of making rational planning for and
Enter the loss that can effectively reduce power grid.Branch current is usually to be difficult to determining, the P of the usable end branch ii、Qi、UiTo replace
Generation, then objective function:
As shown in figure 3, Fig. 3 is uniline main feed route isoboles, there is the load of discrete distribution at each node.
In known head end voltage U0, power P0、Q0, power load distributing PL、QLAnd line impedance Zi-1,1=Ri-1,i+Xi-1,iFeelings
Under condition, it is contemplated that the static characteristic of load, the loss for all roads that need to add up, then voltage at any node i, active, idle
Are as follows:
Then via net loss at node i:
As the above analysis, photo-voltaic power supply is incorporated to the loss that can be reduced in network, should preferentially be incorporated to photo-voltaic power supply
The biggish position of via net loss.
It is possible thereby to determine that the distributed photovoltaic access power distribution network power-carrying calculation method of present embodiment includes:
Step 1: calculating the voltage value U of each node in uniline main feed route according to head end voltagei.Specific calculation formula
As shown in formula (3).U in formula (3)i、Pi、QiVoltage, active power and the reactive power of respectively i-th node；Ui-1、
Pi-1、Qi-1Voltage, active power and the reactive power of respectively (i-1)-th node；Ri,i-1Between node i and node i -1
Resistance；Xi,i-1Reactance between node i and node i -1.
Step 2: calculating the accumulation resistance R at each nodeΣAnd accumulation reactance XΣ.The resistance of every point-to-point transmission, electricity in route
Anti- is that can survey, can ask, and accumulation resistance and the calculating process for accumulating reactance are obviously also to be easy to be calculated.
Step 3: according to the voltage value U of each nodei, accumulation resistance RΣAnd accumulation reactance XΣIt finds out active at node i
Power PiAnd reactive power Qi.Shown in specific calculating process such as formula (4) and formula (5), in formulaIndicate tired
Product resistance；Indicate accumulation reactance.
Step 4: according to the voltage value U of each nodei, accumulation resistance RΣ, accumulation reactance XΣ, active-power Pi, reactive power
QiFind out the via net loss P of i-th of nodei,loss.Shown in calculating process such as formula (6).
Step 5: choosing P in all nodesi,lossIt is worth maximum node access photo-voltaic power supply.
Specific embodiment 2: P is calculatedi,lossLater, it is also necessary to guarantee what selected access point had access to
Power-carrying will guarantee that other branch powers do not limit more.Before illustrating the calculation method of power-carrying, first to branch
It cut-offs distribution factor optimum theory and is briefly introduced in road:
If the effective power flow of branch i is Pi, branch i cut-off variation the trend on route j can be caused to change, variable quantity
ForAnd PiWithSystem can use branch breaking distribution factor Di-jIt indicates:
Load flow calculation based on algorithm quicksort writes effective power flow iterative equation therein:
Δ P=B0Δθ (8)
In formula, B0For the n × n rank susceptance matrix formed with 1/x.Δ θ is the change of the voltage phase angle as caused by branch breaking
Change value.
If cut-off the both ends branch i node be n, m, it is assumed that cut-off front and back node inject it is active constant, then after branch i is cut-off
Caused power variation is Δ P=[0 ... Pi…-Pi…0]T=MiPi, wherein Pi,-PiRespectively correspond node n, m, MiIt is branch
The branch of i-node incidence vector, in corresponding+1, the m point corresponding -1 of n point, remaining node is 0.Voltage phase angle changing valueIt is obtained using matrix inversion lemmaX is B in formula0's
It is inverse, μi=XMi, ci=(- xi+Xi-i)-1,After the branch i beginning on branch j caused power flow changing size:
In formula, MjIt is branch-node incidence vector of branch j, by formula (9) it is found that the distribution factor of cut-offfing of route i, j areIf the port mutual impedance of branch i and branch j isThen
N is the set of all branches in formula.Usual Xi-i<xi, therefore the value range of above formula denominator is 0 to 1.When and only
When branch i cut-off cause periods of network disruption to crack when Xi-i=xi, D at this timei-jMeaning is lost.
Based on above-mentioned theory, present embodiment also proposes a kind of distributed photovoltaic access power distribution network based on distribution factor method
Power-carrying calculation method is the operation carried out after specific embodiment one has determined access point.
It is not limited in terms of constraint condition more by access point power, the variable quantity that is incorporated to of photo-voltaic power supply is analogized into institute's access leg
Cut-off variation.The power output P of photo-voltaic power supplypvIntensity of solar radiation, transfer efficiency of inverter etc. is related, ignores weather class
The influence of type may be expressed as: when mainly considering fine day condition
In formula, ηnFor inverter transfer efficiency；RsFor solar energy actual emanations intensity；RbAt the standard conditions for solar energy
Radiation intensity, usually take 1kW/m2；CpvFor the installed capacity of photovoltaic parallel in system.
If the power constraints of the permission of access point j are Pmin≤Pj≤Pmax, then j point electric work, which changes, is up to Δ Pj,max
=Pj,max-Pj,min, then not out-of-limit for guarantee branch j: Δ Pj,max=Di-jPpv, i.e.,
Therefore, the access ultimate capacity of branch i is
That is present embodiment can also include step 6 and step 7 after specific embodiment one is finished:
Step 6: in the case where access point is i-th of node, according to formulaCarry out calculating i-th
The access ultimate capacity of branch where a nodeWherein Di-jIndicate branch breaking distribution factor, Δ Pj,max=Pj,max-
Pj,min, Pj,minFor the minimum power that j-th of node allows, Pj,maxThe maximum power allowed for i-th of node.
Step 7: by i-th node withValue be powered.
<embodiment effect analysis>
To verify the above method, as shown in Fig. 2, by taking the 110kV distribution network systems of 14 nodes as an example, obtained by calculating
As a result, choosing loss maximum point at two accesses photo-voltaic power supply, simulation analysis is carried out to system.The system interior joint 1 is that boosting becomes
High-pressure side, voltage 121kV, system have two branches, and route transmission power maximum value is 50MW, allow the model of variation
Enclose is ± 5%.Specific on-position and access capacity are shown in Table 1.
The optimal on-position of 1 system photovoltaic of table and power-carrying
The system load flow comparison of photo-voltaic power supply access front and back is shown in Table 2
The trend numerical value comparison of 2 photo-voltaic power supply of table access front and back
By photo-voltaic power supply it can be seen from comparison of computational results be incorporated to rear system needed for the power of offer be decreased obviously, and line
The loss of road greatly reduces also with the promotion of voltage.
Fig. 4 is seen with access posterior nodal point voltage value comparison before photo-voltaic power supply access.
Wherein voltage uses the expression-form of per unit value.Abscissa represents number of nodes, and ordinate is each node voltage mark
Value.As seen from Figure 3, after accessing photo-voltaic power supply at node 7 and node 11, the effect of being obviously improved is pressed with to line electricity, thus
Have and utilizes the active loss reduced on route.
The present invention allows transmission power etc. using loss minimization as optimization aim with electric line it can be seen from said effect
For constraint, it is planned using the calculation method of Fast Practical.Being emulated by example Load flow calculation proves the method
Validity, the reasonable access for demonstrating photo-voltaic power supply can play a supportive role to the voltage at system middle part or endpoint node, and reduce
The network loss of system.
The present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, this field
Technical staff makes various corresponding changes and modifications in accordance with the present invention, but these corresponding changes and modifications all should belong to
The protection scope of the appended claims of the present invention.
Claims (6)
1. a kind of distributed photovoltaic accesses power distribution network power-carrying calculation method characterized by comprising
Step 1: calculating the voltage value U of each node in uniline main feed route according to head end voltagei；
Step 2: calculating the accumulation resistance R at each nodeΣAnd accumulation reactance XΣ；
Step 3: according to the voltage value U of each nodei, accumulation resistance RΣAnd accumulation reactance XΣFind out the active power at node i
PiAnd reactive power Qi；
Step 4: according to the voltage value U of each nodei, accumulation resistance RΣ, accumulation reactance XΣ, active-power Pi, reactive power QiIt asks
The via net loss P of i-th of node outi,loss；
Step 5: choosing P in all nodesi,lossIt is worth maximum node access photo-voltaic power supply.
2. distributed photovoltaic according to claim 1 accesses power distribution network power-carrying calculation method, which is characterized in that step
One detailed process are as follows: pass through formula
It is calculated；Wherein Ui、Pi、QiVoltage, active power and the reactive power of respectively i-th node；Ui-1、Pi-1、
Qi-1Voltage, active power and the reactive power of respectively (i-1)-th node；Ri,i-1Electricity between node i and node i -1
Resistance；Xi,i-1Reactance between node i and node i -1；
As i=0, U0For head end voltage；P0For the active power of head end；Q0For the reactive power of head end.
3. distributed photovoltaic according to claim 2 accesses power distribution network power-carrying calculation method, which is characterized in that step
Three detailed process are as follows: pass through formula
Carry out calculating solution；WhereinIndicate accumulation resistance；Indicate accumulation reactance.
4. distributed photovoltaic according to claim 3 accesses power distribution network power-carrying calculation method, which is characterized in that step
Four detailed process are as follows: pass through formula
It is calculated.
5. distributed photovoltaic according to claim 1 or 4 accesses power distribution network power-carrying calculation method, which is characterized in that
Further include:
Step 6: carrying out branch where calculating i-th of node according to the following formula in the case where access point is i-th of node
Access ultimate capacity
Wherein Di-jIndicate branch breaking distribution factor, Δ Pj,max=Pj,max-Pj,min, Pj,minThe minimum allowed for j-th of branch
Power, Pj,maxThe maximum power allowed for j-th of node；J-th of branch is the branch where i-th of node.
6. distributed photovoltaic according to claim 5 accesses power distribution network power-carrying calculation method, which is characterized in that also wrap
It includes:
Step 7: withValue as limit photovoltaic access capacity.
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