CN105703397B - A kind of distributed power source Optimal Configuration Method for considering countryside low-voltage electric distribution network low-voltage and administering - Google Patents
A kind of distributed power source Optimal Configuration Method for considering countryside low-voltage electric distribution network low-voltage and administering Download PDFInfo
- Publication number
- CN105703397B CN105703397B CN201610214082.9A CN201610214082A CN105703397B CN 105703397 B CN105703397 B CN 105703397B CN 201610214082 A CN201610214082 A CN 201610214082A CN 105703397 B CN105703397 B CN 105703397B
- Authority
- CN
- China
- Prior art keywords
- node
- voltage
- phase
- low
- distribution network
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000009826 distribution Methods 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000004364 calculation method Methods 0.000 claims description 18
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 239000011159 matrix material Substances 0.000 claims description 15
- 238000012986 modification Methods 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 1
- 238000005457 optimization Methods 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 240000002853 Nelumbo nucifera Species 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 2
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
-
- 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
-
- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of distributed power source Optimal Configuration Method for considering countryside low-voltage electric distribution network low-voltage and administering, belong to the improvement of power distribution network low-voltage and optimization planning technical field.Specifically include：1) countryside low-voltage electric distribution network three-phase is numbered respectively, and each phase node is identical with the method for numbering serial of branch road, along circuit serial number since the node farthest from power supply point；2) split-phase determines distribution power flow, calculates each node i voltageAnd variation percentage △ Ui(%)；3) according to user's request and power distribution network situation, configuration DG mathematical modeling is established, it is determined that configuring maximum current and maximum capacity that DG node and DG are provided；4) to avoid the elevated phenomenon of voltage occur after configuring DG, the minimum current and minimum capacity of DG offers are determined according to minimum load situation.The present invention overcomes the shortcomings that three-phase load unbalance and asymmetrical voltage, effectively administers countryside low-voltage electric distribution network low-voltage problem by distributing DG rationally, and can apply to the regional power grid of more main lines.
Description
Technical field
Administered the present invention relates to power distribution network low-voltage and optimization planning technical field, particularly one kind consider low-voltage distribution
The distributed power source Optimal Configuration Method that net low-voltage is administered.
Background technology
As production and growth in the living standard, the power consumption in rural area are continuously increased.In recent years, make Rural Power Distribution Network gradual
The problem of exposing low voltage.Easily occur during irrigation period that load is concentrated use in, processing of farm products phase, festivals or holidays
" full load " the even phenomenon of " overload ".Because rural area is wide, user is scattered, the path length of line powering half, rural electricity consumption
The rapid growth of load, while also there is three-phase line impedance asymmetry, load three-phase imbalance, impedance ratio for low-voltage network
The factor such as larger, during peak of power consumption, cause countryside low-voltage electric distribution network low voltage, it is impossible to meet low pressure (380V/220V)
Voltage tolerance value is+7%~-10% requirement.Rural area " low-voltage " problem influences power supply enterprise's brand image, influences old
The vital interests of the common people, influence the sustainable development of rural economy society, and " low-voltage " control is imminent, it is necessary to study low
It is press-fitted the voltage regulation problem of power network.
At present, the conventional voltage adjusting method of power distribution network：Change load tap changer pressure regulation, voltage regulator, profit are set
Change reactive power distribution pressure regulation (shunt reactor compensation), line with reactive-load compensation equipments such as static compensator, shunt capacitors
Road series capacitor compensation (can by increase conductor cross-section, the methods of realize).But at present almost all of control method and
Just for substation level and above power network, the research to 10kV and level below power network is seldom for the research of strategy.Rural power
The voltage-regulation regulation of net is mainly realized by the regulation to higher level's 60kV, 110kV power network, it is difficult to solve countryside low-voltage electric distribution network
" low-voltage " problem.
With the dual-pressure of the energy and environment, application of the distributed power source (DG) in power distribution network receives much concern.Distribution
Formula electricity DG is a kind of small-scale power generation system being distributed in a power distribution system.DG capacity is from several kW~several MW.DG
Low and medium voltage distribution network can be connected directly between.DG application, which has, reduces loss, environmentally friendly, improvement voltage, delay electric power
System renovates, reduces cost of investment and improved the advantage of reliability.DG has become the important electricity in power distribution network
Source, the quantity that DG is accessed in power distribution network constantly dramatically increase, and wherein one of reason is its support energy to distribution network voltage
Power.DG can reduce circuit overload and provide voltage support.This has very much for the voltage regulation problem of power distribution network long transmission line
Profit.Also to solve the problems, such as that China's power distribution network exposes low voltage, particularly countryside low-voltage electric distribution network low voltage problem, carry
New thinking is supplied.
However, only cannot be guaranteed the optimization of distribution system runnability comprising DG, according to DG different capabilities, position and
Access is horizontal, and distributed power source may have a negative impact to power distribution network.And the DG indices distributed rationally to power distribution network
And running situation plays conclusive effect, therefore the correctly configuration for DG in power distribution network is most important, to power distribution network
Operating index plays conclusive effect.Distribute rationally and run in terms of document in DG from this stage, its main purpose can be concluded
Or be summarised as exporting a certain proportion of active or reactive power to power network, so as to improve distribution network voltage curve, reduce distribution
Network loss consumption, reduce investment.But existing method does not account for three-phase load unbalance, the asymmetric feelings of three-phase line impedance
Condition, do not propose the optimization method for rural area three-phase four-wire low-voltage power distribution network low-voltage problem.
The content of the invention
The purpose of the present invention is distributing rationally by DG, fundamentally improves rural area three-phase four-wire low-voltage power distribution network
Trend is distributed, and solves scattered user, the path length of line powering half, threephase load imbalance, the asymmetric three-phase of three-phase line impedance
" low-voltage " problem of four-wire system countryside low-voltage electric distribution network；A kind of wieldy DG Optimal Configuration Methods are proposed, improve voltage
Curve, ensure the electricity consumption of user.
The invention aims to make up the deficiency of countryside low-voltage electric distribution network voltage adjusting method and technology, and propose DG
Optimal Configuration Method, fundamentally improve rural area three-phase four-wire low-voltage power distribution network trend distribution, improve voltage curve, solution
" low-voltage " problem of certainly above-mentioned countryside low-voltage electric distribution network, while reduce loss.
In order to solve above-mentioned " low-voltage " problem, a kind of consideration countryside low-voltage electric distribution network low-voltage provided by the invention is administered
Distributed power source Optimal Configuration Method, described countryside low-voltage electric distribution network has that three-phase four-wire power supply, user be scattered, circuit
Radius of electricity supply is long, threephase load is uneven, the asymmetric feature of three-phase line impedance, and considers countryside low-voltage electric distribution network
Configure idle and DG influence, it is characterised in that specifically include following steps：
1) countryside low-voltage electric distribution network a, b, c three-phases are numbered respectively, i.e., split-phase is numbered, the method for numbering serial of each phase node and branch road
Identical, along circuit serial number since the node farthest from power supply point, the numbering of power supply point is maximum, from the more remote node of power supply point
Number smaller.
2) according to countryside low-voltage electric distribution network initial data (including power supply point voltage, load data, power conditions and circuit
Impedance), split-phase calculates the load current of each node iBranch road i electric currentSplit-phase determines that low-voltage network trend is distributed, meter
Calculate each node i voltageVoltage landingAnd variation percentage △ Ui(%)；
3) matched somebody with somebody according to the actual conditions of the demand of user in countryside low-voltage electric distribution network actual motion, and power distribution network, foundation
DG mathematical modeling is put, it is determined that configuration DG principle and configuration DG node, calculate node it is expected improved variation hundred
Fraction, and determine the maximum current I that DG is providedDGmax.1With maximum capacity PDGmax.1；
4) in order to ensure the normal operation of countryside low-voltage electric distribution network, avoid the elevated phenomenon of voltage, root occur after configuring DG
Verified according to minimum load situation, carry out Load flow calculation, analyze power and voltage's distribiuting during minimum load situation, calculated
Variation percentage, determine the minimum current I that DG is providedDGmin.1And the minimum capacity P for DG configurationsDGmin.1, IDGmin.1≤
IDGmax.1, PDGmin.1≤PDGmax.1。
Embodiment
Described step 1) is specially
The numbering principle of node and branch road includes：1. the node away from power supply point is preferentially numbered, the numbering of power supply point is maximum,
Power supply point is referred to as root node；2. along circuit serial number since the node farthest from root node, node serial number is followed successively by 1,2,
The numbering of 3 ... 3. each nodes is unique；4. the numbering of branch road is equal to the numbering of its endpoint node；
Described step 2) is specially
21) split-phase calculates the phase load electric current of each phase node, and each phase calculation formula is identical, the phase load electric current of node i
In formula：For node i phase voltageConjugation (kV)；
22) split-phase calculates each phase branch current distribution, and each phase calculation formula is identical, the matrix form of each branch road phase current：
Ib=KIIL (2)
In formula：IbFor branch current column vector,ILArrange and swear for node load Injection Current
Amount,Coefficient matrix
If be furnished with reactive-load compensation equipment or DG in network, formula (2) is rewritten as：
In formula：INFor node Injection Current column vector；ICTo be furnished with the Injection Current row that reactive-load compensation equipment provides in network
Vector；IGTo be furnished with the Injection Current column vector that DG is provided in network；
23) split-phase calculates root node to the voltage landing of each node, and calculation formula is identical, the voltage of root node to node i
Land and beRoot node to the voltage landing of each node matrix form：
Δ U=10-3×ZLIb (4)
In formula：Δ U is the column vector that root node lands to each node voltage,
ZLThe upper triangular matrix formed for branch impedance,ZjFor branch road j phase of impedance, (j=1,
2,…,n)；
24) split-phase calculates the voltage of each node, and calculation formula is identical, the matrix form of the voltage of each node：
In formula：epFor unit column vector, ep=[1 1 ... 1]T；For the voltage of power supply point；U is node voltage row arrow
Amount,
25) split-phase calculates the voltage of each node, the voltage of node i
In formula：UiFor node i voltage (kV)；For node i voltage landing (kV)；For the voltage (kV) of power supply；θ is
The phase angle (rad) of node i voltage；
26) split-phase calculates the variation percentage of each node, node i variation percentage △ Ui(%) is：
In formula：△UiFor node i voltage landing (kV)；UNFor the rated voltage (kV) of low-voltage network.
Described step 3) concretely comprises the following steps：
31) split-phase configuration DG mathematical modeling is established：
Object function：△Ual.min(%)≤△ Ui(%)≤△ Ual.max(%) (8)
Constraints：△Pmax.af<△Pmax.be (9)
In formula：△Ual.max(%), △ Ual.min(%) be respectively countryside low-voltage electric distribution network allow maximum, minimum voltage it is inclined
Move percentage；△Pmax.be、△Pmax.afRespectively configure each phase active loss before and after DG；
32) according to user's request in the actual motion of countryside low-voltage electric distribution network, and configuration DG mathematical modeling, it is determined that matching somebody with somebody
Put DG principle.Configure DG principle：1. consider uneven, split-phase configuration DG；2. the quantity for configuring DG is as few as possible；3. negative
When lotus changes, the variation percentage of countryside low-voltage electric distribution network can be changed by adjusting DG output current, make it full
Sufficient formula (8)；It is 4. most obvious to the regulating effect of voltage；5. the loss of power distribution network is minimum；
33) in the case of peak load, according in mathematical modeling in step 31) and step 32) configure DG principle, really
Determine DG configuration quantity, and DG allocation positions and capacity.
Step 33) is specially in described step 3)：
A) DG configures quantity in the case of peak load, and percentage △ U are offset according to each node voltagei(%), search not
Meet the node of formula (8), and same set Γ will be placed on by node on same pathsk, k ∈ K={ 1,2,3 ... }, K Γk
Indexed set；For arbitrary r, s ∈ K, and r ≠ s, then Γr∩Γs=Φ, Φ are null set；Single-point configuration is considered first
DG, when being unsatisfactory for formula (8), consider 2 points or Multipoint weighting DG；When configuring DG, first from set Γ1Start, then consider successively
Γ2、Γ3…
B) for set ΓkStart, consider single-point configuration DG first；Single-point configures DG node iav.1For set ΓkMiddle section
Node serial number at the average voltage in point place path, node iav.1VoltageFor：
In formula：M is set ΓkInterior joint sum；
C) according to step 32), node iav.1Configure the modulus value I for the maximum current that DG is providedDGmax.1Determined according to formula (11)：
In formula：The injection node i provided for DGav.1Maximum current (A)；For node iav.1To node i1+ 1
Impedance；△Uex.1(%) is node iav.1It is expected improved variation percentage；
△Uex.1(%) is determined according to formula (8) (9), is ensured arbitrary node j ∈ Γ1, node j variation percentage △ Uj
(%) meets formula (8)；
DG configuration maximum capacity determines according to formula (12)：
In formula：PDGmax.1To configure DG maximum capacity (kW)；To configure DG posterior nodal points iav.1Voltage (kV)；
D) DG can not meet in step 32) 3. 4. and 5. when, will when considering 2 points of configuration DG, 2 points of configuration DG
Set ΓkInterior joint iav.1For boundary, by set ΓkIt is divided into two subclass, the corresponding road warp of each subclass, Ran Hougen
According to step b) and c), to set ΓkTwo subclass corresponding to path be respectively completed DG single-point configuration, determine DG configure
Position and capacity；
4. and 5. e) when 2 points of configuration DG can not be met in step 32) 3., Multipoint weighting DG is considered, by set ΓkIt is divided into
Mm set (mm >=3), the corresponding road warp of each subclass, then according to step b) and c), to set ΓkMm son
The corresponding path of set is respectively completed DG single-point configuration, determines DG allocation positions and capacity.
Described step 4) is specially：
41) it is minimum load to set all loads first, carries out Load flow calculation, determines variation percentage；
42) whether meet to require according to formula (8), decision node variation percentage, if meeting to require, DG configurations
Minimum current IDGmin.1=IDGmax.1, minimum capacity PDGmin.1=PDGmax.1, otherwise go to step 43)；
43) analyze and determine to be unsatisfactory for requiring that node it is expected improved variation percentage, modification set ΓkMiddle configuration
The DG capacity of DG nodes, it is determined that so that DG minimum currents I when all node voltages are satisfied by requiringDGmin.1And configured for DG
Minimum capacity PDGmin.1；
Compared with prior art compared with what the present invention reached has the beneficial effect that：
(1) present invention is applied to three-phase four-wire low-voltage power distribution network.Meter and three-phase four-wire low-voltage distribution network users point
Dissipate, the path length of line powering half, threephase load imbalance, the asymmetric feature of three-phase line impedance, and consider low-voltage network
Be configured idle and distributed power source influence, established the mathematical modeling of split-phase calculating, realize according to each phase load with
The distribution of power supply, split-phase distribute DG rationally, and power distribution network low-voltage problem is effectively administered from planning aspect；
(2) present invention is according to the distribution of a, b, c three-phase load during peak load situation and power supply, split-phase calculating low-voltage distribution
The trend distribution of net, determines each node voltage of power distribution network.Then each node voltage landing percentage is calculated according to formula (5)~(7)
△Ui(%), voltage landing percentage △ U will be unsatisfactory fori(%) is required and node is placed on same collection on same paths
Close, unified to consider, the average voltage point respectively gathered is arranged to configure DG node, it is determined that the maximum current and match somebody with somebody that DG is provided
DG maximum capacity is put, identity set is realized and a little configures the mesh that each node voltage level of the improvement set can be achieved in DG
, it ensure that solve the problems, such as the feasibility of power distribution network low-voltage from method.
(3) present invention is according to the distribution of a, b, c three-phase load during minimum load situation and power supply, each node voltage drop of split-phase
Fall percentage △ Ui(%), judges whether each node voltage skew percentage meets to require, if meeting to require, the electricity of DG configurations
Stream and capacity need not be changed；If occurring being unsatisfactory for requiring situation, analyze and determine to need the DG configuration nodes changed and
The electric current and capacity that DG is provided, it is determined that so that DG minimum currents and DG when all node voltages are satisfied by requiring configure most
Low capacity, ensure effective improvement of power distribution network low-voltage problem from the angle of operation.
Brief description of the drawings
The schematic flow sheet of Fig. 1 present invention
The low-voltage distributing line schematic diagram of Fig. 2 present invention
The single-point configuration DG of Fig. 3 present invention schematic diagram
The actual 0.4kV three-phase four-wire systems network diagram of Fig. 4 present invention
The deviation ratio of busy hour node voltage is relatively schemed before and after Fig. 5 present invention configurations DG
Node variation compares figure during minimum load before and after Fig. 6 present invention configurations DG
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of distributed power source Optimal Configuration Method for considering countryside low-voltage electric distribution network low-voltage and administering, institute
The countryside low-voltage electric distribution network stated have three-phase four-wire power supply, user scattered, the path length of line powering half, threephase load it is uneven,
The asymmetric feature of three-phase line impedance, and consider low-voltage network and be configured idle and distributed power source influence, its
It is characterised by, specifically includes following steps：
Step 1：Countryside low-voltage electric distribution network a, b, c three-phase is numbered respectively, i.e., split-phase is numbered, the volume of each phase node and branch road
Number method is identical, and along circuit serial number since the node farthest from power supply point, the numbering of power supply point is maximum, is got over from power supply point
Remote node serial number is smaller；As shown in Fig. 2 Z in Fig. 2iFor branch road i phase of impedance, PLi+jQLiFor the phase load power of node i,
For the phase load electric current of node i, the numbering principle of node and branch road is specially：
1. the node away from power supply point is preferentially numbered, the numbering of power supply point is maximum, and power supply point is referred to as root node；2. from from root
The farthest node of node starts along circuit serial number, and the numbering that node serial number is followed successively by 1,2,3 ... 3. each nodes is unique；
4. the numbering of branch road is equal to the numbering of its endpoint node；
Step 2：According to countryside low-voltage electric distribution network initial data (including root node voltage, load data, power conditions with
And line impedance), split-phase calculates the load current of each node iBranch road i electric currentSplit-phase determines low-voltage network trend
Distribution, calculates each node i voltageVoltage landingAnd variation percentage △ Ui(%), it is specially：
21) split-phase calculates the phase load electric current of each phase node, and each phase calculation formula is identical, the phase load electric current of node i
In formula：For node i phase voltageConjugation (kV)；
22) split-phase calculates each phase branch current distribution, and each phase calculation formula is identical, the matrix form of each branch road phase current：
Ib=KIIL (2)
In formula：IbFor branch current column vector,ILArrange and swear for node load Injection Current
Amount,Coefficient matrix
If be furnished with reactive-load compensation equipment or DG in network, formula (2) is rewritten as：
In formula：INFor node Injection Current column vector；ICTo be furnished with the Injection Current row that reactive-load compensation equipment provides in network
Vector；IGTo be furnished with the Injection Current column vector that DG is provided in network；
23) split-phase calculates root node to the voltage landing of each node, and calculation formula is identical, the voltage of root node to node i
Land and beRoot node to the voltage landing of each node matrix form：
Δ U=10-3×ZLIb(4)
In formula：Δ U is the column vector that root node lands to each node voltage,ZL
The upper triangular matrix formed for branch impedance,ZjFor branch road j phase of impedance, (j=1,2 ...,
n)；
24) split-phase calculates the voltage of each node, and calculation formula is identical, the matrix form of the voltage of each node：
In formula：epFor unit column vector, ep=[1 1 ... 1]T；For the voltage of power supply point；U is node voltage row arrow
Amount,
25) split-phase calculates the voltage of each node, the voltage of node i
In formula：UiFor node i voltage (kV)；For node i voltage landing (kV)；For the voltage (kV) of power supply；θ is
The phase angle (rad) of node i voltage；
26) split-phase calculates the variation percentage of each node, node i variation percentage △ Ui(%) is：
In formula：△UiFor node i voltage landing (kV)；UNFor the rated voltage (kV) of low-voltage network.
Step 3：According to the actual conditions of the demand of user in countryside low-voltage electric distribution network actual motion, and power distribution network, build
Vertical configuration DG mathematical modeling, it is determined that configuration DG principle and configuration DG node, the voltage that calculate node expectation improves is inclined
Percentage is moved, and determines the maximum current I that DG is providedDGmax.1With maximum capacity PDGmax.1, it is specially：
31) split-phase configuration DG mathematical modeling is established：
Object function：△Ual.min(%)≤△ Ui(%)≤△ Ual.max(%) (8)
Constraints：△Pmax.af<△Pmax.be (9)
In formula：△Ual.max(%), △ Ual.min(%) be respectively countryside low-voltage electric distribution network allow maximum, minimum voltage it is inclined
Move percentage；△Pmax.be、△Pmax.afRespectively configure each phase active loss before and after DG；
32) according to user's request in the actual motion of countryside low-voltage electric distribution network, and configuration DG mathematical modeling, DG is configured
Principle：1. consider uneven, split-phase configuration DG；2. the quantity for configuring DG is as few as possible；3. in load variations, can pass through
The output current for adjusting DG changes the variation percentage of countryside low-voltage electric distribution network, it is met formula (8)；4. to voltage
Regulating effect is most obvious；5. the loss of power distribution network is minimum；
33) in the case of peak load, according in mathematical modeling in step 31) and step 32) configure DG principle, really
Determine DG configuration quantity, and DG allocation positions and capacity, be specially：
A) DG configures quantity in the case of peak load, and percentage △ U are offset according to each node voltagei(%), search not
Meet the node of formula (8), and same set Γ will be placed on by node on same pathsk, k ∈ K={ 1,2,3 ... }, K Γk
Indexed set；For arbitrary r, s ∈ K, and r ≠ s, then Γr∩Γs=Φ, Φ are null set；Single-point configuration is considered first
DG, when being unsatisfactory for formula (8), consider 2 points or Multipoint weighting DG；When configuring DG, first from set Γ1Start, then consider successively
Γ2、Γ3…
B) for set ΓkStart, consider that single-point configures DG first, single-point configuration DG schematic diagram is as shown in Figure 3.Single-point
Configure DG node iav.1For set ΓkNode serial number at the average voltage in interior joint place path, node iav.1Voltage
For：
In formula：M is set ΓkInterior joint sum；
C) according to step 32), node iav.1Configure the modulus value I for the maximum current that DG is providedDGmax.1Determined according to formula (11)：
In formula：The injection node i provided for DGav.1Maximum current (A)；For node iav.1To node i1+ 1
Impedance；△Uex.1(%) is node iav.1It is expected improved variation percentage；
△Uex.1(%) is determined according to formula (8) (9), is ensured arbitrary node j ∈ Γ1, node j variation percentage △ Uj
(%) meets formula (8)；
DG configuration maximum capacity determines according to formula (12)：
In formula：PDGmax.1To configure DG maximum capacity (kW)；To configure DG posterior nodal points iav.1Voltage (kV)；
D) DG can not meet in step 32) 3. 4. and 5. when, will when considering 2 points of configuration DG, 2 points of configuration DG
Set ΓkInterior joint iav.1For boundary, by set ΓkIt is divided into two subclass, the corresponding road warp of each subclass, Ran Hougen
According to step b) and c), to set ΓkTwo subclass corresponding to path be respectively completed DG single-point configuration, determine DG configure
Position and capacity；
4. and 5. e) when 2 points of configuration DG can not be met in step 32) 3., Multipoint weighting DG is considered, by set ΓkIt is divided into
Mm set (mm >=3), the corresponding road warp of each subclass, then according to step b) and c), to set ΓkMm son
The corresponding path of set is respectively completed DG single-point configuration, determines DG allocation positions and capacity.
Step 4：In order to ensure the normal operation of low-voltage network, avoid the elevated phenomenon of voltage, root occur after configuring DG
Verified according to minimum load situation, carry out Load flow calculation, analyze power and voltage's distribiuting during minimum load situation, calculated
Variation percentage, determine the minimum current I that DG is providedDGmin.1And minimum capacity PDGmin.1, it is specially：
41) it is minimum load to set all loads first, carries out Load flow calculation, determines variation percentage；
42) whether meet to require according to formula (8), decision node variation percentage, if meeting to require, DG configurations
Minimum current IDGmin.1=IDGmax.1, minimum capacity PDGmin.1=PDGmax.1, otherwise go to step 43)；
43) analyze and determine to be unsatisfactory for requiring that node it is expected improved variation percentage, modification set ΓkMiddle configuration
The DG capacity of DG nodes, it is determined that so that DG minimum currents when all node voltages are satisfied by requiringAnd configured for DG
Minimum capacity PDGmin.1；
By taking the actual annual data of 0.4kV three-phase four-wire systems countryside low-voltage electric distribution network 2014 shown in Fig. 4 as an example, three-phase is analyzed respectively
Balancing the load, three-phase load unbalance, three-phase load unbalance are simultaneously connected to voltage's distribiuting in the case of three kinds of reactive-load compensation, and according to
Voltage's distribiuting configures DG.According to standard and the running situation of reality, the maximum of low-voltage network permission, minimum voltage is taken to offset
Percentage is respectively+the 5% and -5% of system nominal voltage.In Fig. 4 during three-phase equilibrium load, average maximum three-phase it is total it is active,
Load or burden without work is respectively 24.41176471kW, 9.949839232kvar；Always active and reactive load is respectively average minimum three-phase
18.459375kW、9.433184466kvar.Fig. 4 head ends if (node 16) phase voltage is 0.22kV, three-phase load unbalance.It is fixed
The ratio of each corresponding phase average three-phase equilibrium load of each phase load of node of justice is load coefficient, minimum, peak load coefficient
As shown in table 1.
Fig. 4 interior joints 5 are connected to reactive-load compensation equipment, and each phase reactive-load compensations of ABC are 0.5kW during minimum load, and maximum is negative
Each phase reactive-load compensations of ABC are 5kW during lotus.Fig. 4 interior joints 6 have been connected to DG, and each phase DG capacity of ABC is during minimum load
Each phase DG capacity of 0.2kW, busy hour ABC is 1kW.
The load coefficient of table 1
The distribution of busy hour node voltage is first calculated according to this method, then calculates each node voltage skew percentage,
For the node for being unsatisfactory for requiring, ABC three-phase start node set Γ is formed respectivelya、Γb、Γc, Γa={ 1 }, Γb=1,2,
3,4,5 }, Γc={ 1,2,3,4 }, Γa、Γb、ΓcInterior joint is on same path, single-point configuration DG, allocation position and capacity
As shown in table 2.
The DG installation sites of table 2 and capacity
Each node voltage deviation ratio is compared with as shown in figure 5, in Fig. 5 before and after the busy hour configuration DG obtained according to this method
(a) black curve a1, b1, c1 are respectively to configure variation curve before DG in (b) (c), and red curve a2, b2, c2 are respectively
Variation curve after configuration DG.
Loss analysis are as shown in table 3 when maximum, minimum load before and after configuration DG.
Before and after configuring DG, variation such as Fig. 6 during minimum load.
Loss analysis when maximum, minimum load before and after the configuration of table 3 DG
Finally illustrate, only illustrate technical scheme rather than its limitations with reference to above-described embodiment, affiliated neck
The those of ordinary skill in domain is to be understood that：Those skilled in the art can to the present invention embodiment modify or
Person's equivalent substitution, but these modifications or change are in the claim protection domain applied for a patent.
Claims (6)
1. a kind of distributed power source Optimal Configuration Method for considering countryside low-voltage electric distribution network low-voltage and administering, described rural area low pressure
Power distribution network has scattered three-phase four-wire power supply, user, the path length of line powering half, threephase load imbalance, three-phase line impedance
Asymmetric feature, and consider countryside low-voltage electric distribution network and be configured idle and distributed power source influence, it is characterised in that
Specifically include following steps：
1) countryside low-voltage electric distribution network a, b, c three-phases are numbered respectively, i.e., split-phase is numbered, the method for numbering serial phase of each phase node and branch road
Together, along circuit serial number since the node farthest from power supply point, the numbering of power supply point is maximum, is compiled from the more remote node of power supply point
It is number smaller；
2) load current of each node i is calculated according to countryside low-voltage electric distribution network initial data, split-phaseBranch road i electric currentPoint
The distribution of low-voltage network trend is mutually determined, calculates each node i voltageVoltage landingAnd variation percentage Δ Ui
(%), the countryside low-voltage electric distribution network initial data, including power supply point voltage, load data, power conditions and line impedance；
3) according to the actual conditions of the demand of user in countryside low-voltage electric distribution network actual motion, and power distribution network, configuration DG is established
Mathematical modeling, it is determined that configuration DG principle and configure DG node, calculate node it is expected improve variation percentage,
And determine the maximum current I that DG is providedDGmax.1With maximum capacity PDGmax.1；
4) in order to ensure the normal operation of countryside low-voltage electric distribution network, avoid the elevated phenomenon of voltage occur after configuring DG, according to most
Smaller load situation is verified, and carries out Load flow calculation, analyzes power and voltage's distribiuting during minimum load situation, calculates voltage
Percentage is offset, determines the minimum current I that DG is providedDGmin.1And the minimum capacity P for DG configurationsDGmin.1, IDGmin.1≤
IDGmax.1, PDGmin.1≤PDGmax.1。
2. a kind of distributed power source for considering that countryside low-voltage electric distribution network low-voltage is administered according to claim 1 is distributed rationally
Method, it is characterised in that described step 1) is specially：
The numbering principle of node and branch road includes：1. the node away from power supply point is preferentially numbered, the numbering of power supply point is maximum, power supply
Point is referred to as root node；2. along circuit serial number since the node farthest from root node, node serial number is followed successively by 1,2,3 ...
3. the numbering of each node is unique；4. the numbering of branch road is equal to the numbering of its endpoint node.
3. a kind of distributed power source for considering that countryside low-voltage electric distribution network low-voltage is administered according to claim 1 is distributed rationally
Method, it is characterised in that described step 2) concretely comprises the following steps：
21) split-phase calculates the phase load electric current of each phase node, and each phase calculation formula is identical, the phase load electric current of node i
In formula：For node i phase voltageConjugation (kV)；
22) split-phase calculates each phase branch current distribution, and each phase calculation formula is identical, the matrix form of each branch road phase current：
Ib=KIIL (2)
In formula：IbFor branch current column vector,ILFor node load Injection Current column vector,Coefficient matrix
If be furnished with reactive-load compensation equipment or DG in network, formula (2) is rewritten as：
In formula：INFor node Injection Current column vector；ICThe Injection Current provided to be furnished with reactive-load compensation equipment in network arranges arrow
Amount；IGTo be furnished with the Injection Current column vector that DG is provided in network；
23) split-phase calculates root node to the voltage landing of each node, and calculation formula is identical, the voltage landing of root node to node i
ForRoot node to the voltage landing of each node matrix form：
Δ U=10-3×ZLIb (4)
In formula：Δ U is the column vector that root node lands to each node voltage,ZLFor branch
The upper triangular matrix of the anti-composition of roadlock,ZjFor branch road j phase of impedance, (j=1,2 ..., n)；
24) split-phase calculates the voltage of each node, and calculation formula is identical, the matrix form of the voltage of each node：
In formula：epFor unit column vector, ep=[1 1 ... 1]T；For the voltage of power supply point 1；U is node voltage column vector,
25) split-phase calculates the voltage of each node, the voltage of node i
In formula：UiFor node i voltage (kV)；For node i voltage landing (kV)；For the voltage (kV) of power supply；θ is node
The phase angle (rad) of i voltages；
26) split-phase calculates the variation percentage of each node, node i variation percentage Δ Ui(%) is：
In formula：ΔUiFor node i voltage landing (kV)；UNFor the rated voltage (kV) of low-voltage network.
4. a kind of distributed power source for considering that countryside low-voltage electric distribution network low-voltage is administered according to claim 1 is distributed rationally
Method, it is characterised in that described step 3) concretely comprises the following steps：
31) split-phase configuration DG mathematical modeling is established：
Object function：ΔUal.min(%)≤Δ Ui(%)≤Δ Ual.max(%) (8)
Constraints：ΔPmax.af<ΔPmax.be (9)
In formula：ΔUal.max(%), Δ Ual.min(%) is respectively maximum+5%, the minimum -10% that countryside low-voltage electric distribution network allows
Variation percentage；ΔPmax.be、ΔPmax.afRespectively configure each phase active loss before and after DG；
32) according to user's request in the actual motion of countryside low-voltage electric distribution network, and configuration DG mathematical modeling, it is determined that configuration DG
Principle, configure DG principle：1. consider uneven, split-phase configuration DG；2. the quantity for configuring DG is as few as possible；3. become in load
During change, the variation percentage of countryside low-voltage electric distribution network can be changed by adjusting DG output current, it is met formula
(8)；It is 4. most obvious to the regulating effect of voltage；5. the loss of power distribution network is minimum；
33) in the case of peak load, according to the principle that DG is configured in mathematical modeling in step 31) and step 32), DG is determined
Configuration quantity, and DG allocation positions and capacity.
5. a kind of distributed power source for considering that countryside low-voltage electric distribution network low-voltage is administered according to claim 4 is distributed rationally
Method, it is characterised in that described step 33) concretely comprises the following steps：
A) DG configures quantity in the case of peak load, and percentage Δ U is offset according to each node voltagei(%), lookup are unsatisfactory for formula
(8) node, and same set Γ will be placed on by node on same pathsk, k ∈ K={ 1,2,3 ... }, K ΓkSubscript
Set；For arbitrary r, s ∈ K, and r ≠ s, then Γr∩Γs=Φ, Φ are null set；Single-point configuration DG is considered first, is discontented with
During sufficient formula (8), 2 points or Multipoint weighting DG are considered；When configuring DG, first from set Γ1Start, then consider Γ successively2、
Γ3…
B) for set ΓkStart, consider single-point configuration DG first；Single-point configures DG node iav.1For set ΓkInterior joint institute
The node serial number at the average voltage in path, node iav.1VoltageFor：
In formula：M is set ΓkInterior joint sum；
C) according to step 32), node iav.1The electric current that DG is provided is configured to be determined according to formula (11)：
In formula：The injection node i provided for DGav.1Maximum current (A)；For node iav.1To node i1+ 1 resistance
It is anti-；ΔUex.1(%) is node iav.1It is expected improved variation percentage；
ΔUex.1(%) is determined according to formula (8) (9), is ensured arbitrary node j ∈ Γ1, node j variation percentage Δs Uj(%)
Meet formula (8)；
DG configuration maximum capacity determines according to formula (12)：
In formula：PDGmax.1To configure DG maximum capacity (kW)；To configure DG posterior nodal points iav.1Voltage (kV)；
D) during DG can not meet step 32) 3. 4. and 5. when, will set Γ when considering 2 points of configuration DG, 2 points of configuration DGk
Interior joint iav.1For boundary, by set ΓkIt is divided into two subclass, the corresponding road warp of each subclass, then according to step b)
And c), to set ΓkTwo subclass corresponding to path be respectively completed DG single-point configuration, determine DG allocation positions and appearance
Amount；
4. and 5. e) when 2 points of configuration DG can not be met in step 32) 3., Multipoint weighting DG is considered, by set ΓkIt is divided into mm collection
Close, mm >=3, the corresponding road warp of each subclass, then step b) and c), to set ΓkMm subclass corresponding to
Path be respectively completed DG single-point configuration, determine DG allocation positions and capacity.
6. a kind of distributed power source for considering that countryside low-voltage electric distribution network low-voltage is administered according to claim 5 is distributed rationally
Method, it is characterised in that described step 4) concretely comprises the following steps：
41) it is minimum load to set all loads first, carries out Load flow calculation, determines variation percentage；
42) whether meet to require according to formula (8), decision node variation percentage, if meeting to require, the minimum of DG configurations
Electric current IDGmin.1=IDGmax.1, minimum capacity PDGmin.1=PDGmax.1, otherwise go to step 43)；
43) analyze and determine to be unsatisfactory for requiring that node it is expected improved variation percentage, modification set ΓkMiddle configuration DG sections
The DG capacity of point, it is determined that so that DG minimum currents I when all node voltages are satisfied by requiringDGmin.1And for DG configurations most
Low capacity PDGmin.1。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610214082.9A CN105703397B (en) | 2016-04-07 | 2016-04-07 | A kind of distributed power source Optimal Configuration Method for considering countryside low-voltage electric distribution network low-voltage and administering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610214082.9A CN105703397B (en) | 2016-04-07 | 2016-04-07 | A kind of distributed power source Optimal Configuration Method for considering countryside low-voltage electric distribution network low-voltage and administering |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105703397A CN105703397A (en) | 2016-06-22 |
| CN105703397B true CN105703397B (en) | 2018-03-02 |
Family
ID=56218512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610214082.9A Expired - Fee Related CN105703397B (en) | 2016-04-07 | 2016-04-07 | A kind of distributed power source Optimal Configuration Method for considering countryside low-voltage electric distribution network low-voltage and administering |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105703397B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106410798B (en) * | 2016-11-23 | 2019-02-22 | 国网山东省电力公司威海供电公司 | A kind of distribute-electricity transformer district low-voltage pre-judging method |
| CN110034566B (en) * | 2019-05-14 | 2024-07-23 | 沈阳农业大学 | Centralized on-site grading and zoning voltage control method for medium-low voltage distribution network |
| CN114487919B (en) * | 2022-04-15 | 2022-07-01 | 石家庄科林电气股份有限公司 | Self-adaptive method for wiring mode of three-phase electric energy meter |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5877648B2 (en) * | 2011-03-23 | 2016-03-08 | 北陸電力株式会社 | Distributed power system |
| CN103593711B (en) * | 2013-10-31 | 2016-06-08 | 浙江大学 | A kind of distributed power source Optimal Configuration Method |
| EP2869422A1 (en) * | 2013-11-04 | 2015-05-06 | ABB Technology AG | Method and system for monitoring a grid voltage in a low voltage grid |
| CN104463369A (en) * | 2014-12-12 | 2015-03-25 | 国家电网公司 | Site selection and constant volume optimization method and system for distributed power sources |
| CN105071433B (en) * | 2015-07-31 | 2018-04-20 | 贵州大学 | A kind of configuration scheme of distributed generation resource |
| CN105305484B (en) * | 2015-10-14 | 2017-08-04 | 国家电网公司 | A kind of distributed power source Optimal Configuration Method suitable for power distribution network |
-
2016
- 2016-04-07 CN CN201610214082.9A patent/CN105703397B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN105703397A (en) | 2016-06-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Singh et al. | Optimum allocation of distributed generations based on nodal pricing for profit, loss reduction, and voltage improvement including voltage rise issue | |
| CN105574238B (en) | A kind of section real power control analysis of strategies method for the assessment of online stability margin | |
| Bhattacharyya et al. | UPFC with series and shunt FACTS controllers for the economic operation of a power system | |
| CN109861303A (en) | A kind of direct-current grid control method for coordinating dynamically distributed containing generatrix voltage compensation and load power | |
| CN110676834B (en) | Isolated direct current micro-grid coordination method considering unmatched line resistance and local load | |
| CN109390962B (en) | Unbalanced power self-adaptive optimization distribution method of multi-terminal flexible-straight system | |
| CN108988402A (en) | Alternating current-direct current power distribution network optimal control method based on Optimized Operation | |
| CN105703397B (en) | A kind of distributed power source Optimal Configuration Method for considering countryside low-voltage electric distribution network low-voltage and administering | |
| Chopade et al. | Minimizing cost and power loss by optimal placement of capacitor using ETAP | |
| CN107093900B (en) | A kind of Distributed Power Flow controller optimization configuration method | |
| Ni et al. | Fuzzy logic-based virtual capacitor adaptive control for multiple HESSs in a DC microgrid system | |
| CN108923461A (en) | It is a kind of meter and relay protection constraint distributed inverter power supply enter optimization method | |
| CN107332290B (en) | Regional load transfer method based on direct current circuit | |
| CN116345466A (en) | Two-stage power flow optimization method of active power distribution network considering distribution network reconstruction | |
| CN106786598A (en) | The complete controllable flexible distribution system of the alternating current-direct current seamless blended of level networking and method | |
| Prionistis et al. | Voltage stability support offered by active distribution networks | |
| CN106655253A (en) | Single-/three-phase multi-micro-grid region dynamic partitioning method | |
| CN106953361B (en) | Exchange micro-grid operational control method and device | |
| Fahad et al. | A coordination control strategy for power quality enhancement of an active distribution network | |
| Ciric et al. | Observing the performance of distribution systems with embedded generators | |
| CN106374460B (en) | A kind of middle pressure feeder line based on load moment nargin cut-offs position preferred method | |
| Mustafa et al. | System level-based voltage-sag mitigation using distributed energy resources | |
| Martí et al. | Reactive power control for loss minimization in low-voltage distributed generation systems | |
| Rabii et al. | A novel approach for reactive source sizing and placement in distribution networks | |
| Li et al. | Adaptive droop control of the VSC-MTDC distribution network considering Power–Voltage deviation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Meng Xiaofang Inventor after: Wang Lidi Inventor after: Wang Jun Inventor after: Wang Hui Inventor after: Tan Dongming Inventor after: Guo Dan Inventor after: Wang Yingnan Inventor before: Meng Xiaofang Inventor before: Wang Lidi Inventor before: Wang Jun Inventor before: Wang Hui Inventor before: Tan Dongming Inventor before: Guo Dan |
|
| CB03 | Change of inventor or designer information | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20170930 Address after: 110161 1-3-2, 133 building, 120 Dongling Road, Shenyang, Liaoning Applicant after: Shenyang Agricultural University Applicant after: Wang Yingnan Address before: 110161 1-3-2, 133 building, 120 Dongling Road, Shenyang, Liaoning Applicant before: Shenyang Agricultural University |
|
| TA01 | Transfer of patent application right | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180302 Termination date: 20200407 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |