CN110233497A - A kind of poverty alleviation photovoltaic local distribution network autonomy-coordination optimization regulation method and system - Google Patents
A kind of poverty alleviation photovoltaic local distribution network autonomy-coordination optimization regulation method and system Download PDFInfo
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
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- 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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- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention discloses a kind of poverty alleviation photovoltaic local distribution network autonomy-coordination optimizations to regulate and control method and system, which comprises according to the observation information of power distribution network to be optimized, obtains the ceiling voltage and minimum voltage estimated value of each branch of power distribution network；For each node, the voltage variety of the node is obtained；Whether it is greater than preset threshold according to the voltage variety of the node, by the node division to corresponding autonomous area, so that each autonomous area is carried out from main regulation；Design obtains the output so that the operation the smallest each controllable of overall performane for the objective function of power distribution network overall situation operation overall performane, and adjusts corresponding controllable according to the output；The present invention has the advantages that obtaining network voltage distribution in the case where finite quantity information, and classifying rationally autonomous area, area coordination control model is carried out.
Description
Technical field
The present invention relates to power distribution networks to run regulation and control field, is more particularly to a kind of poverty alleviation photovoltaic local distribution network autonomy-association
Adjust Optimum Regulation method and system.
Background technique
To respond national photovoltaic Anti-poverty Strategy plan, exponentially type rises part poverty alleviation area photovoltaic plant quantity.And agriculture
Net rack is naturally weak, lacks effective measurement information and controllable equipment, after a large amount of poverty alleviation light photovoltaic accesses, due to its hair
Electricity randomness and fluctuation, cause power distribution network power supply quality deteriorate, voltage out-of-limit is serious, and increase along with line loss, three
The problems such as phase imbalance, so that the operation regulation and control model of poverty alleviation local distribution network faces a severe test.
Corresponding research has been carried out for many people of power distribution network distributed photovoltaic bring problems.For example, it is contemplated that working as
When traditional voltage control method is all invalid, out-of-limit node voltage is set to restore normal using the method for cutting down the active output of DG.
The prior art also has proposition by two stages law of planning and rational management DG and power distribution network tradition adjustment equipment, is reduced with reaching
Network loss reduces equipment and adjusts number, the purpose to optimize the system operation.There are also propose and meanwhile consider the active and reactive output of DG with
And the charge and discharge of energy storage device are maximum come the DG power utilization for realizing network in a period of time.
However, the above method be based on distribution network structure structure it is strong and measure communications service it is sound under the premise of, can not
Adapt to the problem that poverty-stricken area grid structure is weak, measurement communication condition is limited, the centralized control period is long.
Summary of the invention
Technical problem to be solved by the present invention lies in the control methods of the power distribution network of the prior art can not adapt to miserably
Area's grid structure is weak, measures the problem that communication condition is limited, the centralized control period is long.
The present invention is solution above-mentioned technical problem by the following technical programs: a kind of poverty alleviation photovoltaic local distribution network from
Control-coordinate and optimize regulation method, which comprises
Step 1: according to the observation information of power distribution network to be optimized, the ceiling voltage and most of each branch of power distribution network is obtained
Low-voltage estimated value；
Step 2: it is directed to each node, obtains the voltage variety of the node；
Whether step 3: being greater than preset threshold according to the voltage variety of the node, by the node division to correspondence
Autonomous area so that each autonomous area is carried out from main regulation；
Step 4: design is obtained for the objective function of power distribution network overall situation operation overall performane so that operation overall performane is minimum
Each controllable output, and corresponding controllable is adjusted according to the output.
Preferably, the controllable is distributed generation resource, inverter or energy storage device.
Preferably, the step 1, comprising:
For each of power distribution network branch, pass through formulaObtain the branch
Road ceiling voltage, wherein Uli,maxIndicate the ceiling voltage of i-th branch of power distribution network；Ui,1Indicate the first node of i-th branch
Voltage；UDGi,jIndicate the grid-connected voltage of j-th of distributed generation resource of i-th branch of power distribution network；GiIndicate point of i-th branch
The set of cloth power supply；
According to the observation information of n-th of node of branch i, by formula,
The branch is calculated for the minimum of each node
Voltage estimated value, wherein Umin,nThe minimum voltage estimated value of each node is directed to for branch；Pm,nIndicate the of i-th article of branch
M node flows to the active power of n-th of node；Qm,nIndicate that m-th of node of i-th branch flows to the nothing of n-th of node
Function power；Ui,nIndicate the observation point voltage of m-th of node of i-th branch；rm,nIt indicates between m-th of node and n-th of node
The real part of line impedance；xm,nIndicate the imaginary part of line impedance between m-th of node and n-th of node；r1,mIndicate the
The real part of line impedance, x between 1 node and m-th of node1,mIndicate the 1st line impedance between node and m-th of node
Imaginary part；For the average voltage of power distribution network；
Pass through formulaThe branch minimum voltage estimated value is obtained,
In, N1 indicates considerable test points set.
Preferably, the step 2 includes:
For each node, using formula,Obtain the electricity of the node
Press variable quantity, wherein Δ Uk1When indicating to inject active changed power, the voltage variety of arbitrary node k； R0,kIndicate power distribution network
Line resistance between first node and k-th of node；R0,jIndicate the line resistance between power distribution network first node and jth node；R0,1
Indicate the line resistance between the 1st node of power distribution network first node and i-th article of branch road；liIndicate the node collection of i-th branch
It closes；ΔPDGi,jFor the active variable quantity of i-th branch road, j-th of distributed generation resource；
Alternatively,
For each node, formula is utilizedObtain the electricity of the node
Press variable quantity, wherein Δ Uk2When indicating injection reactive power variation, the voltage variety of arbitrary node k； X0,kIndicate power distribution network
Line reactance between first node and k-th of node；X0,jIndicate the line reactance between power distribution network first node and jth node；X0,1
Indicate the line reactance between the 1st node of power distribution network first node and i-th article of branch road；ΔQDGi,jIt is j-th on the road of i-th branch
The idle work variable quantity of distributed generation resource；
Alternatively,
For each node, formula is utilized
Obtain the voltage variety of the node, wherein Δ UkIt indicates while injecting reactive power variation and active power
When variation, the voltage variety of arbitrary node k；Indicate the power factor limit of i-th j-th of road of branch distributed generation resource
Value；
ΔUkMatrix form are as follows:Wherein [Rk] indicate to match
The set of matrices of line resistance between power grid first node and all nodes, [Xk] indicate between power distribution network first node and all nodes
Line reactance set of matrices, N be nonnegative integer set.
Preferably, the step 3, comprising:
For each controllable, using formula,Meter
Calculate the voltage variety of arbitrary node k, wherein [Δ Uk] it is Δ UkMatrix form；It is the centromere of AR with node where DG
Point,
Using formula,By each node division
Extremely corresponding autonomous area,
Wherein, AR is single autonomous area, and DG is distributed generation resource, Δ VthmFor threshold voltage；
When the voltage variety of node transfinites, tune is passed through as the controllable in the autonomous area where the node
The power output for saving itself carries out the adjusting of the node voltage.
Preferably, by each node division to corresponding autonomous area, comprising:
The node for belonging to more than two AR for each, obtain the node corresponds to described two above AR's
Voltage variety, and by the node division to the corresponding AR of voltage variety maximum value；
Alternatively, described two above AR are merged into one if more than two AR controllable having the same
AR。
Preferably, objective function in the step 4 are as follows:
Wherein, f is that power distribution network runs overall performane；Cvol-maxFor high voltage index weights；Cvol-minFor low-voltage index power
Weight；CtapFor power distribution network transformer on-load voltage regulating operating index；CkFor power distribution network switched capacitors operating index weight；
For power distribution network ceiling voltage in regulating cycle t；For power distribution network minimum voltage in regulating cycle t；For regulating cycle t-1
Interior power distribution network ceiling voltage；For power distribution network minimum voltage in regulating cycle t-1；taptBecome for power distribution network in regulating cycle t
Depressor tap gear investment group number；For power distribution network capacitor investment group number in regulating cycle t；
The objective function includes constraint condition, and the constraint condition includes:
VmaxFor distribution network voltage upper safety limit；VminFor distribution network voltage lower safety limit；kmaxIt can switching electricity for power distribution network
Container installation group number；tapmaxFor the load tap changer gear upper limit；tapminFor load tap changer gear lower limit；Table
Show the active power factor of i-th of DG in regulating cycle t；Indicate regulating cycle t in i-th of DG active power because
Number limit value；Indicate the reactive factor of i-th of DG in regulating cycle t；For the nothing of i-th of DG in regulating cycle t
Function power factor limit value；Indicate the active usage factor of i-th of DG in regulating cycle t；The collection of T expression regulating cycle t
It closes.
The present invention also provides a kind of poverty alleviation photovoltaic local distribution network autonomy-coordination optimization regulation method control system, packets
Global coordination control layer and regional autonomy control module are included, the autonomous control module includes several autonomous areas, if described
Adjacent autonomous area interaction each autonomous region domain affiliated area range and regulating power information in dry autonomous area,
Wherein, the global coordination control layer, is used for:
Step 1: according to the observation information of power distribution network to be optimized, the ceiling voltage and most of each branch of power distribution network is obtained
Low-voltage estimated value；
Step 2: it is directed to each node, obtains the voltage variety of the node；
Step 3: whether preset threshold and controllable are greater than to the section according to the voltage variety of the node
The influence degree of point, by the node division to corresponding autonomous area, so that each autonomous area is carried out from main regulation；
Step 4: design is obtained for the objective function of power distribution network overall situation operation overall performane so that operation overall performane is minimum
Each controllable output, and corresponding controllable is adjusted according to the output；
The regional autonomy control module, for receiving the regulating command of global coordination control layer, and according to the adjusting
Instruction adjusts the output of itself.
The present invention has the advantage that power distribution network regulation is divided into regional autonomy and the overall situation by the present invention compared with prior art
Coordinate two regulation levels, the problem limited first against power distribution network measurement information, the centralized control period is long is set using photovoltaic
Standby observability and controllability, power supply is that power distribution network is divided into and multiple runs with system by autonomous area center in a distributed manner
State change and autonomous area with adaptivity, make full use of the idle output regulating power of distributed generation resource, realize voltage
District autonomous control, reduces the requirement to Distribution Network Frame structure robustness, and reduces the requirement to communications service is surveyed,
And then improve the control effect of power distribution network；
Weak for rural power grids grid structure, information content is limited, and the present invention is in the case where finite quantity information in acquisition system
The estimated value of each node voltage variable quantity, thus according to each node voltage variable quantity to power distribution network controllable regulating power into
Row calculates analysis.
Global coordination control layer is matched by planning as a whole the more autonomous areas of regulation with conventional electrical distribution net adjusting device, is being protected
On the basis of each node voltage meets safety requirements in barrier power grid, reduces equipment and adjust number, optimize the system operation state.
Detailed description of the invention
Fig. 1 is that a kind of poverty alleviation photovoltaic local distribution network autonomy-coordination optimization provided in an embodiment of the present invention regulates and controls method
Flow chart；
Fig. 2 is in a kind of poverty alleviation photovoltaic local distribution network autonomy-coordination optimization regulation method provided in an embodiment of the present invention
Autonomous area divides flow chart；
Fig. 3 is in a kind of poverty alleviation photovoltaic local distribution network autonomy-coordination optimization regulation method provided in an embodiment of the present invention
The schematic diagram of autonomous area dividing condition 1；
Fig. 4 is in a kind of poverty alleviation photovoltaic local distribution network autonomy-coordination optimization regulation method provided in an embodiment of the present invention
The schematic diagram of autonomous area dividing condition 2；
Fig. 5 is that a kind of poverty alleviation photovoltaic local distribution network autonomy-coordination optimization provided in an embodiment of the present invention regulates and controls method
The structural schematic diagram of power distribution network；
Fig. 6 is in a kind of poverty alleviation photovoltaic local distribution network autonomy-coordination optimization regulation method provided in an embodiment of the present invention
The distribution network voltage distribution results figure that test macro obtains under Load flow calculation and observation model when not accessing DG；
Fig. 7 is in a kind of poverty alleviation photovoltaic local distribution network autonomy-coordination optimization regulation method provided in an embodiment of the present invention
The distribution network voltage distribution results figure that test macro obtains under Load flow calculation and observation model when DG is fully loaded with work；
Fig. 8 is in a kind of poverty alleviation photovoltaic local distribution network autonomy-coordination optimization regulation method provided in an embodiment of the present invention
When DG1 and DG3 only issue active power, DG2 without adjustable reactive capability in the case where system give node voltage variable quantity；
Fig. 9 is in a kind of poverty alleviation photovoltaic local distribution network autonomy-coordination optimization regulation method provided in an embodiment of the present invention
The voltage's distribiuting comparison diagram of each node of system under three kinds of scenes.
Specific embodiment
Elaborate below to the embodiment of the present invention, the present embodiment under the premise of the technical scheme of the present invention into
Row is implemented, and the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to following realities
Apply example.
The present invention provides a kind of poverty alleviation photovoltaic local distribution network autonomy-coordination optimization regulation method, as shown in Figure 1, for this
Invention provides a kind of flow chart of poverty alleviation photovoltaic local distribution network autonomy-coordination optimization regulation method, which comprises
Step S1: according to the observation information of power distribution network to be optimized, the ceiling voltage and most of each branch of power distribution network is obtained
Low-voltage estimated value；
For each of power distribution network branch, pass through formulaObtain the branch
Road ceiling voltage, wherein Uli,maxIndicate the ceiling voltage of i-th branch of power distribution network；Ui,1Indicate the first node of i-th branch
Voltage；UDGi,jIndicate the grid-connected voltage of j-th of distributed generation resource of i-th branch of power distribution network；GiIndicate point of i-th branch
The set of cloth power supply；
According to the observation information of n-th of node of branch i, by formula,
The branch is calculated for the minimum of each node
Voltage estimated value, wherein Umin,nThe minimum voltage estimated value of each node is directed to for branch；Pm,nIndicate the of i-th article of branch
M node flows to the active power of n-th of node；Qm,nIndicate that m-th of node of i-th branch flows to the nothing of n-th of node
Function power；Ui,nIndicate the observation point voltage of m-th of node of i-th branch；rm,nIt indicates between m-th of node and n-th of node
The real part of line impedance；xm,nIndicate the imaginary part of line impedance between m-th of node and n-th of node；r1,mIndicate the
The real part of line impedance, x between 1 node and m-th of node1,mIndicate the 1st line impedance between node and m-th of node
Imaginary part；For the average voltage of power distribution network；
Pass through formulaThe branch minimum voltage estimated value is obtained,
In, N1 indicates considerable test points set.The formula is the condition allowed for measurement with computing resource, with considerable test points set
Bigger, branch minimum voltage estimated value is more accurate, and the observation point core calculation amount needed also increases with it.So observation point compared with
Less or in the case where computing resource scarcity, branch minimum voltage can be calculated for the data of first node, then for known
Another node data calculate branch minimum voltage, averaged and propped up by the branch minimum voltage that will be acquired twice
The estimated value of road minimum voltage obtains the estimation of branch minimum voltage with this in the case where observation point and deficient computing resource
Value.
Step S2: it is directed to each node, obtains the voltage variety of the node；
It is controllably single that power distribution network can be realized without each node measurement information is obtained in the characteristics of based on poverty alleviation photovoltaic power distribution network
First regulating power, power distribution network controllable regulating power mentioned here refer to being obtained according to the power variation of controllable
The voltage variety of the node obtained, node voltage variable quantity show the node by the controllable within a threshold range
Control, if showing the node not by the control of controllable within beyond a threshold range.Note mentioned in the present invention
Enter reactive power variation, inject active changed power and inject reactive power variation and active power variation simultaneously, wherein infusing
Enter the selection for referring to participating in the parameter calculated, such as injection reactive power variation refers to that reactive power variable quantity participates in meter
It calculates；Below for the variation of injection reactive power, injects active changed power and inject reactive power variation and wattful power simultaneously
Rate is respectively calculated the voltage variety of node in the case of changing three kinds, in practice, general to use while injecting idle
Voltage variety when changed power and active power change.
For each node, using formula,Obtain the electricity of the node
Press variable quantity, wherein Δ Uk1When indicating to inject active changed power, the voltage variety of arbitrary node k； R0,kIndicate power distribution network
Line resistance between first node and k-th of node；R0,jIndicate the line resistance between power distribution network first node and jth node；R0,1
Indicate the line resistance between the 1st node of power distribution network first node and i-th article of branch road；liIndicate the node collection of i-th branch
It closes；ΔPDGi,jFor the active variable quantity of i-th branch road, j-th of distributed generation resource；
Alternatively,
For each node, formula is utilizedObtain the electricity of the node
Press variable quantity, wherein Δ Uk2When indicating injection reactive power variation, the voltage variety of arbitrary node k； X0,kIndicate power distribution network
Line reactance between first node and k-th of node；X0,jIndicate the line reactance between power distribution network first node and jth node；X0,1
Indicate the line reactance between the 1st node of power distribution network first node and i-th article of branch road；ΔQDGi,jIt is j-th on the road of i-th branch
The idle work variable quantity of distributed generation resource；
Alternatively,
For each node, formula is utilized
Obtain the voltage variety of the node, wherein Δ UkIt indicates while injecting reactive power variation and active power
When variation, the voltage variety of arbitrary node k；Indicate the power factor limit of i-th j-th of road of branch distributed generation resource
Value；
ΔUkMatrix form are as follows:Wherein [Rk] indicate to match
The set of matrices of line resistance between power grid first node and all nodes, [Xk] indicate between power distribution network first node and all nodes
Line reactance set of matrices, N be nonnegative integer set.
Power distribution network can obtain whole network voltage distribution according to the voltage variety of arbitrary node, open from line end node
Begin, measures itself active power, reactive power and voltage variety first, and transfer data to adjacent upstream
Node passes through formula after the node of upstream receives downstream informationObtain route most
High voltage passes through formulaRoute minimum voltage is obtained, then by calculated result
It is transferred to upstream node with itself active power, reactive power and voltage variety, repeats the above process to obtain whole
The voltage's distribiuting of route, every branch sends the voltage's distribiuting situation itself perceived to global coordination control layer, final to obtain
It is distributed to whole network voltage.
Whether step S3: being greater than preset threshold according to the voltage variety of the node, by the node division to correspondence
Autonomous area so that each autonomous area is carried out from main regulation；
It should be noted that heretofore described controllable is distributed generation resource, inverter or energy storage device.
It is illustrated in figure 2 autonomous area and divides flow chart, for each controllable, using formula,Calculate the voltage variety of arbitrary node k, wherein [Δ Uk]
For Δ UkMatrix form；It is the central node of AR with node where DG,
Using formula,By each node division to right
The autonomous area answered, when there is autonomous area overlapping:
It is illustrated in figure 3 the schematic diagram of autonomous area dividing condition 1, situation 1: the method divided by area above
By each node division to corresponding autonomous area, it is possible to the same node occur and belong to different AR, i.e. a node quilt
More than two AR are divided into, the node of more than two AR is belonged to for each, obtain the node corresponds to described two
The voltage variety of a above AR, and by the node division to the corresponding AR of voltage variety maximum value；
It is illustrated in figure 4 the schematic diagram of autonomous area dividing condition 2, situation 2: the method divided by area above
By each node division to corresponding autonomous area, it is possible to multiple AR overlappings occur, and the central node of multiple AR is respectively positioned on
In overlapping region, it should be noted that node where the central node, that is, controllable, controllable when dividing region,
AR where it where node is the AR where controllable, is respectively positioned on overlapping region for the central node of this multiple AR
Interior situation, the foundation of region division are as follows:, will be described two above if more than two AR controllable having the same
AR merge into an AR, i.e., three AR in figure are merged into the same AR, then nodes where three controllables belong in figure
AR after merging.
Wherein, AR is single autonomous area, and DG is distributed generation resource, Δ VthmFor threshold voltage；
When the voltage variety of node transfinites, tune is passed through as the controllable in the autonomous area where the node
The power output for saving itself carries out the adjusting of the node voltage.
Autonomous area is able to carry out regional autonomy, and regional autonomy includes: out-of-limit when occurring local voltage in distribution network line
When, the out-of-limit place autonomous area of local voltage can to distributed generation resource on the line issue pressure regulation request, concurrent power transmission pressure
Out-of-limit relevant information, after distributed generation resource receives request, according to the out-of-limit situation of node, with the voltage variety of node
Own reactive output is adjusted in formula, so that voltage return normal voltage range.
Step S4: design is obtained for the objective function of power distribution network overall situation operation overall performane so that operation overall performane is minimum
Each controllable output, and corresponding controllable is adjusted according to the output.
Wherein, f is that power distribution network runs overall performane；Cvol-maxFor high voltage index weights；Cvol-minFor low-voltage index power
Weight；CtapFor power distribution network transformer on-load voltage regulating operating index；CkFor power distribution network switched capacitors operating index weight；
For power distribution network ceiling voltage in regulating cycle t；For power distribution network minimum voltage in regulating cycle t；For regulating cycle t-1
Interior power distribution network ceiling voltage；For power distribution network minimum voltage in regulating cycle t-1；taptBecome for power distribution network in regulating cycle t
Depressor tap gear investment group number；For power distribution network capacitor investment group number in regulating cycle t；
The objective function includes constraint condition, and the constraint condition includes:
VmaxFor distribution network voltage upper safety limit；VminFor distribution network voltage lower safety limit；kmaxIt can switching electricity for power distribution network
Container installation group number；tapmaxFor the load tap changer gear upper limit；tapminFor load tap changer gear lower limit；Table
Show the active power factor of i-th of DG in regulating cycle t；Indicate regulating cycle t in i-th of DG active power because
Number limit value；Indicate the reactive factor of i-th of DG in regulating cycle t；For the nothing of i-th of DG in regulating cycle t
Function power factor limit value；Indicate the active usage factor of i-th of DG in regulating cycle t；The collection of T expression regulating cycle t
It closes.
The above process is substantially the process of a coordinated control, and general thought is to match by planning as a whole regulation AR with tradition
Power grid regulation equipment matches, and on the basis of each node voltage meets safety requirements in ensureing power grid, reduces equipment and adjusts
Number, optimize the system operation state.Global coordination control layer receives the voltage's distribiuting situation of every branch in each autonomous region domain,
Whole network voltage distribution is finally obtained, when there is voltage out-of-limit, global coordination control layer is perceived according to whole network voltage distribution situation
To the voltage out-of-limit, global coordination control layer sends coordinated control order to there is the autonomous area of voltage out-of-limit, voltage out-of-limit
Autonomous area to distributed generation resource on the line issue pressure regulation request, and send the relevant information of voltage out-of-limit, be distributed
After formula power supply receives request, according to the out-of-limit situation of node, with node voltage variety formula to own reactive export into
Row is adjusted, so that voltage return normal voltage range, is adjusted own reactive output the constraint for following objective function
Condition meets power distribution network operation overall performane.
The present invention also provides a kind of poverty alleviation photovoltaic local distribution network autonomy-coordination optimization regulation method control system, packets
Global coordination control layer and regional autonomy control module are included, the autonomous control module includes several autonomous areas, if described
Adjacent autonomous area interaction each autonomous region domain affiliated area range and regulating power information, described in dry autonomous area
Global coordination control layer sends coordinated control instruction to each autonomous region domain, and each autonomous region domain sends this to global coordination control layer
Ground measurement information, local measurement information include the letter such as active power, reactive power and voltage variety of autonomous area itself
Breath；
Specifically, the global coordination control layer, is used for:
Step S1: according to the observation information of power distribution network to be optimized, the ceiling voltage and most of each branch of power distribution network is obtained
Low-voltage estimated value；
Step S2: it is directed to each node, obtains the voltage variety of the node；
Step S3: whether preset threshold and controllable are greater than to the section according to the voltage variety of the node
The influence degree of point, by the node division to corresponding autonomous area, so that each autonomous area is carried out from main regulation；
Step S4: design is obtained for the objective function of power distribution network overall situation operation overall performane so that operation overall performane is minimum
Each controllable output, and corresponding controllable is adjusted according to the output；
The regional autonomy control module, for receiving the regulating command of global coordination control layer, and according to the adjusting
Instruction adjusts the output of itself.
Example Verification is carried out below by way of U.S.'s IEEE33 Node power distribution system, system construction drawing is as shown in figure 5, system
Reference voltage is 12.66kV, and the solid stain of number mark indicates that node, solid line item indicate that feeder line, dotted line indicate contact in figure
Switch.The adjustable range of main transformer pressure regulation is 10%+10% in test macro, totally 7 gears.Compensation capacitor: total 2
Group, every pool-size are 1.5Mvar.3 capacity are respectively the DG access system of 1,0.5,1MW, and power factor limitation is
0.707.According to the regulation of State Grid Corporation of China, the deviation that each feed connection node of 10kV power distribution network allows is 7%-+7%.From figure
It can be seen that the branch where each distributed generation resource have it is multiple, node also have it is multiple, by where each distributed generation resource
The voltage variety of all nodes of branch is calculated, and then according to judgment principle mentioned above, divides each node
Affiliated autonomous area.It is merely given as the structure chart of power distribution network in figure, its region is not divided, is intended merely to intuitive
Displaying power distribution network structure, convenient for the understanding for technical solution of the present invention.
As shown in fig. 6, the distribution network voltage obtained under Load flow calculation and observation model for test macro when not accessing DG
Distribution results, wherein Load flow calculation refers to that the power grid observation method of the prior art, observation model are referred in the present invention and related to
And node minimum voltage, node ceiling voltage estimation process and the data such as node voltage variable quantity calculating, that is, scheme
Show estimating algorithm.The system voltage distribution situation in the case of Load flow calculation and two kinds of estimating algorithm is shown in figure, it can be seen that phase
Than traditional Load flow calculation, it is maximum that estimating algorithm of the invention can accurately perceive out the voltage change trend of system, voltage
Amplitude node, and local voltage minimum node is estimated, so in the case where less data information known to the present invention,
It can also ensure that the voltage's distribiuting of the system of perception is accurate and reliable.
As shown in fig. 7, voltage's distribiuting is as shown in Figure 7 when DG is fully loaded with work, it can be seen that the access of DG, which changes, is
The trend of system flows to, to change voltage's distribiuting, it was demonstrated that by the voltage point for reasonably regulating and controlling to be conducive to improvement system to DG
Cloth.
In order to verify autonomy provided by the invention-coordination optimization regulation method regulating effect, table 1 provides system parameter
It is invariable, only change DG1 without work output, obtained respectively with traditional Load flow calculation and estimating algorithm of the invention
The node voltage of node 5.As can be seen that estimating algorithm in the case where a small amount of data and calculation amount, ensure that higher meter
Calculate precision.Autonomy of the invention-coordination optimization regulation method is known as regulation-control model below, as shown in table 1, by the present invention with
The prior art compares.
1 Load flow calculation of table and estimating algorithm comparing result
After demonstrating estimating algorithm of the invention, intuitively show that the present invention is global for power distribution network below by Fig. 8
The objective function of overall performane is run, obtains the output so that the operation the smallest each controllable of overall performane, and according to described defeated
The coordinated control process of corresponding controllable is adjusted out.When DG1 and DG3 only issue active power, DG2 is without adjustable no power capacity
In the case where amount, obtaining the schedulable idle amount of DG1 and DG3 at this time according to objective function and its constraint condition is
1Mvar, the voltage variety for thus obtaining each node are as shown in Figure 8.As can be seen from Figure 8, DG1 and DG3 are adjusted
After, the voltage change for belonging to the node in DG1 and DG3 controlled range is obvious, shows according to objective function and its constraint item
Part plays the role of the regulation of distributed generation resource, and corresponding node voltage changes.
In addition, being that comparison is reasonable from the foundation that Fig. 8 can also be seen that the present invention divides autonomous area, saved where DG
Near point 11 and 29, voltage variety is maximum, i.e. the adjustment effect of DG is stronger, and closer to power distribution network upstream, i.e. main transformer
The regulating power of neighbouring node, DG is weaker.Wherein each AR interdependent node is as shown in table 2, and table 2 is to be adjusted to DG1 and DG3
After, each node voltage variable quantity of system.
Each node voltage variable quantity of 2 system of table
It should be noted that region division will not be feelings shown in table 2 if DG2 also has schedulable idle amount
Some node is belonged to the region DG2 range by condition, and specific divide will be according to the size of the schedulable idle amount of DG2
It determines.
Such as the voltage's distribiuting comparison diagram that Fig. 9 is each node of system under three kinds of scenes: scene 1, it is idle defeated as all DG
It is out 0；Scene 2, output that the DG of only node 11 is idle are 1MVar；Scene 3, the DG of only node 29 is idle, and output is
1MVar.It can be seen that the affiliated node voltage of AR is changed significantly, and the voltage of AR exterior node when the idle output of DG changes
Influence very little, such as node 18, node 19, node 20 and the almost no change of its voltage of node 21.So DG is for network voltage
Regulation have the function of very big, the present invention divides autonomous area centered on DG, and adjusts electricity by the variation of DG injecting power
Net voltage status is reasonable.
By above technical scheme, a kind of poverty alleviation photovoltaic local distribution network autonomy-coordination optimization regulation provided by the invention
Method and system, the problem limited for power distribution network measurement information, the centralized control period is long, utilize the Observable of photovoltaic apparatus
Property and controllability, in a distributed manner power supply be autonomous area center by power distribution network be divided into it is multiple with system running state variation and
Autonomous area with adaptivity makes full use of the idle output regulating power of distributed generation resource, realizes voltage partition autonomy control
System；Weak for rural power grids grid structure, information content is limited, and the present invention respectively saves in acquisition system in the case where finite quantity information
The estimated value of point voltage variety, to be counted according to each node voltage variable quantity to power distribution network controllable regulating power
Point counting analysis.Global coordination control layer is matched by planning as a whole the more autonomous areas of regulation with conventional electrical distribution net adjusting device, is being ensured
On the basis of each node voltage meets safety requirements in power grid, reduces equipment and adjust number, optimize the system operation state.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (8)
1. a kind of poverty alleviation photovoltaic local distribution network autonomy-coordination optimization regulates and controls method, which is characterized in that the described method includes:
Step 1: according to the observation information of power distribution network to be optimized, the ceiling voltage and minimum electricity of each branch of power distribution network are obtained
Press estimated value；
Step 2: it is directed to each node, obtains the voltage variety of the node；
Whether step 3: being greater than preset threshold according to the voltage variety of the node, by the node division to it is corresponding from
Region is controlled, so that each autonomous area is carried out from main regulation；
Step 4: design is obtained for the objective function of power distribution network overall situation operation overall performane so that operation overall performane is the smallest each
The output of a controllable, and corresponding controllable is adjusted according to the output.
2. a kind of poverty alleviation photovoltaic local distribution network autonomy according to claim 1-coordination optimization regulates and controls method, feature exists
In the controllable is distributed generation resource, inverter or energy storage device.
3. a kind of poverty alleviation photovoltaic local distribution network autonomy according to claim 2-coordination optimization regulates and controls method, feature exists
In the step 1, comprising:
For each of power distribution network branch, pass through formulaObtain the branch highest
Voltage, wherein Uli,maxIndicate the ceiling voltage of i-th branch of power distribution network；Ui,1Indicate the voltage of the first node of i-th branch；
UDGi,jIndicate the grid-connected voltage of j-th of distributed generation resource of i-th branch of power distribution network；GiIndicate the distributed electrical of i-th branch
The set in source；
According to the observation information of n-th of node of branch i, by formula,
The minimum voltage that the branch is calculated for each node is estimated
Evaluation, wherein Umin,nThe minimum voltage estimated value of each node is directed to for branch；Pm,nIndicate m-th of node of i-th branch
Flow to the active power of n-th of node；Qm,nIndicate that m-th of node of i-th branch flows to the reactive power of n-th of node；
Ui,nIndicate the observation point voltage of m-th of node of i-th branch；rm,nIndicate line impedance between m-th of node and n-th of node
Real part；xm,nIndicate the imaginary part of line impedance between m-th of node and n-th of node；r1,mIndicate the 1st node with
The real part of line impedance, x between m-th of node1,mIndicate the imaginary part of the 1st line impedance between node and m-th of node
Point；For the average voltage of power distribution network；
Pass through formulaObtain the branch minimum voltage estimated value, wherein N1
Indicate considerable test points set.
4. a kind of poverty alleviation photovoltaic local distribution network autonomy according to claim 3-coordination optimization regulates and controls method, feature exists
In the step 2 includes:
For each node, using formula,The voltage for obtaining the node becomes
Change amount, wherein Δ Uk1When indicating to inject active changed power, the voltage variety of arbitrary node k；R0,kIndicate power distribution network head section
Line resistance between point and k-th of node；R0,jIndicate the line resistance between power distribution network first node and j-th of node；R0,1It indicates
Line resistance between the 1st node of power distribution network first node and i-th article of branch road；liIndicate the node set of i-th branch；Δ
PDGi,jFor the active variable quantity of i-th branch road, j-th of distributed generation resource；
Alternatively,
For each node, formula is utilizedThe voltage for obtaining the node becomes
Change amount, wherein Δ Uk2When indicating injection reactive power variation, the voltage variety of arbitrary node k；X0,kIndicate power distribution network head section
Line reactance between point and k-th of node；X0,jIndicate the line reactance between power distribution network first node and jth node；X0,1It indicates
Line reactance between the 1st node of power distribution network first node and i-th article of branch road；ΔQDGi,jFor i-th j-th of branch road distribution
The idle work variable quantity of power supply；
Alternatively,
For each node, formula is utilized
Obtain the voltage variety of the node, wherein Δ UkIt indicates while injecting reactive power variation and active power variation
When, the voltage variety of arbitrary node k；Indicate the power factor limit value of i-th branch road, j-th of distributed generation resource；
ΔUkMatrix form are as follows:Wherein [Rk] indicate power distribution network
The set of matrices of line resistance between first node and all nodes, [Xk] indicate route between power distribution network first node and all nodes
The set of matrices of reactance, N are nonnegative integer set.
5. a kind of poverty alleviation photovoltaic local distribution network autonomy according to claim 4-coordination optimization regulates and controls method, feature exists
In the step 3, comprising:
For each controllable, using formula,It calculates any
The voltage variety of node k, wherein [Δ Uk] it is Δ UkMatrix form；
It is the central node of AR with node where DG,
Using formula,By each node division to correspondence
Autonomous area,
Wherein, AR is single autonomous area, and DG is distributed generation resource, Δ VthmFor threshold voltage；
When the voltage variety of node transfinites, as the controllable in the autonomous area where the node by adjusting itself
Power output carry out the adjusting of the node voltage.
6. a kind of poverty alleviation photovoltaic local distribution network autonomy according to claim 5-coordination optimization regulates and controls method, feature exists
In by each node division to corresponding autonomous area, comprising:
The node for belonging to more than two AR for each, the voltage corresponding to described two above AR for obtaining the node become
Change amount, and by the node division to the corresponding AR of voltage variety maximum value；
Alternatively, described two above AR are merged into an AR if more than two AR controllable having the same.
7. a kind of poverty alleviation photovoltaic local distribution network autonomy according to claim 6-coordination optimization regulates and controls method, feature exists
In objective function in the step 4 are as follows:
Wherein, f is that power distribution network runs overall performane；Cvol-maxFor high voltage index weights；Cvol-minFor low-voltage index weights；Ctap
For power distribution network transformer on-load voltage regulating operating index；CkFor power distribution network switched capacitors operating index weight；To adjust week
Power distribution network ceiling voltage in phase t；For power distribution network minimum voltage in regulating cycle t；For power distribution network in regulating cycle t-1
Ceiling voltage；For power distribution network minimum voltage in regulating cycle t-1；taptFor power distribution network load tap changer in regulating cycle t
Gear investment group number；For power distribution network capacitor investment group number in regulating cycle t；
The objective function includes constraint condition, and the constraint condition includes:
VmaxFor distribution network voltage upper safety limit；VminFor distribution network voltage lower safety limit；kmaxFor power distribution network switched capacitors peace
Dress group number；tapmaxFor the load tap changer gear upper limit；tapminFor load tap changer gear lower limit；It indicates to adjust week
The active power factor of i-th of DG in phase t；Indicate the active power factor limit value of i-th of DG in regulating cycle t；Indicate the reactive factor of i-th of DG in regulating cycle t；For i-th of DG in regulating cycle t reactive power because
Number limit value；Indicate the active usage factor of i-th of DG in regulating cycle t；The set of T expression regulating cycle t.
8. a kind of control of described in any item poverty alleviation photovoltaic local distribution network autonomies of claim 1-7-coordination optimization regulation method
System processed, which is characterized in that including global coordination control layer and regional autonomy control module, if the autonomous control module includes
A dry autonomous area, in several described autonomous areas adjacent autonomous area interaction each autonomous region domain affiliated area range and
Regulating power information,
Wherein,
The global coordination control layer, is used for:
Step 1: according to the observation information of power distribution network to be optimized, the ceiling voltage and minimum electricity of each branch of power distribution network are obtained
Press estimated value；
Step 2: it is directed to each node, obtains the voltage variety of the node；
Step 3: whether preset threshold and controllable are greater than to the node according to the voltage variety of the node
Influence degree, by the node division to corresponding autonomous area, so that each autonomous area is carried out from main regulation；
Step 4: design is obtained for the objective function of power distribution network overall situation operation overall performane so that operation overall performane is the smallest each
The output of a controllable, and corresponding controllable is adjusted according to the output；
The regional autonomy control module, for receiving the regulating command of global coordination control layer, and according to the regulating command
Adjust the output of itself.
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