CN107317353A - A kind of control method of distribution network voltage containing distributed photovoltaic power generation and system - Google Patents
A kind of control method of distribution network voltage containing distributed photovoltaic power generation and system Download PDFInfo
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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Abstract
The invention provides a kind of control method of distribution network voltage containing distributed photovoltaic power generation and system, including：The distributed photovoltaic power generation voltage that distributed photovoltaic power generation access node is accessed is ranked up according to power distribution network node voltage situation of crossing the border, calculate the reactive power increment of the distributed photovoltaic power generation of the node access ranked the first, and judge whether in adjustable range, if the control instruction exported if using the reactive power increment as distributed photovoltaic power generation；If judging remaining node successively according to sequence not if, choose the reactive power increment in adjustable range；If all reactive power increments are not in adjustable range, the active power increment of the distributed photovoltaic power generation of the node access ranked the first, the control instruction exported by distributed photovoltaic power generation of the active power increment are calculated.The technical scheme that the present invention is provided adds the utilization to the reactive power regulating power of distributed photovoltaic power generation, and quickly power distribution network node voltage can be controlled.
Description
Technical field
The present invention relates to active power distribution network voltage control technology field, more particularly to a kind of distribution containing distributed photovoltaic power generation
Net voltage control method.
Background technology
Distributed photovoltaic power generation (DPVG, Distributed Photovoltaic Generation) is a kind of generating shape
Formula, due to its technology maturation, installation and it is easy to maintenance the features such as be widely used, in order to promote power generation sustainable development,
In the aspect of generating electricity by way of merging two or more grid systems, the grid-connected ratio in low and medium voltage distribution network of distributed photovoltaic power generation is gradually added, bulk power grid is formed
The active power distribution network situation of load is supplied with the multiple power sources such as local photovoltaic generation.The decision exerted oneself due to external environment condition to photovoltaic
The variation characteristic of property and whole day workload demand, according to distribution line power output direction and the difference of size, the node of power distribution network
Voltage is likely to occur too high or too low situation, and supply voltage quality has larger shadow to the performance of electric distribution network electrical equipment
Ring.
Voltage control is a daily vital task of power distribution network, and the voltage control method of current power distribution network relies on electric capacity
The conventional voltage adjustment equipment such as device, ULTC, have ignored the reactive power capability of photovoltaic, and economy is poor.In voltage control
While processed, photovoltaic generation reactive voltage enabling capabilities, and the dependence to other distribution network voltage adjustment equipments are have ignored, is thrown
Money is higher, and economy is poor.
Accordingly, it is desirable to provide a kind of control method of distribution network voltage containing distributed photovoltaic power generation and system, above-mentioned to overcome
Defect.
The content of the invention
It is an object of the invention to overcome prior art difficult point, participate in voltage control by using distributed photovoltaic power generation and have
There is rapidity, reduce voltage pulsation to the influence with electricity consumption.It is too high that rear distribution network voltage is incorporated to for distributed photovoltaic power generation
There is provided a kind of control of distribution network voltage containing distributed photovoltaic power generation for the problem of influenceing big to distribution network voltage with distribution network load heavy duty
Method processed, to solve the problems, such as that power distribution network node voltage is too high and brownout, suppress in time the further up of voltage or
Decline.
The present invention provides a kind of control method of distribution network voltage containing distributed photovoltaic power generation, including：
Determine the situation of crossing the border of power distribution network node voltage；
The distributed photovoltaic accessed according to the situation of crossing the border of power distribution network node voltage to distributed photovoltaic power generation access node
Generating voltage is ranked up；
The nothing for the distributed photovoltaic power generation that the distributed photovoltaic power generation access node ranked the first is accessed is calculated according to sequence
Work(power increment, judges the reactive power increment whether in adjustable range, if the distributed light accessed if with the node
The control instruction that the reactive power increment that volt generates electricity is exported as distributed photovoltaic power generation；Judged successively according to sequence if not if
Remaining node, until choosing node of the reactive power increment of the distributed photovoltaic power generation of access in adjustable range；If all
The reactive power increment of the distributed photovoltaic power generation of node access calculates the distribution ranked the first not in adjustable range, then
The active power increment of the distributed photovoltaic power generation of photovoltaic generation access node access, and the distributed photovoltaic accessed with the node
The control instruction that the active power increment of generating is exported as distributed photovoltaic power generation.
According to following model g (Vi) determine the situation of crossing the border of the power distribution network node voltage：
In formula：ViFor the voltage swing of power distribution network node i, V0For power distribution network rated voltage size；VhlFor power distribution network node
Voltage hard constraint lower boundary, VhuFor power distribution network node voltage hard constraint coboundary；VslUnder voltage constraint after softening for hard constraint
Border, VsuVoltage after softening for hard constraint constrains coboundary；ωvCrossed the border penalty factor for hard constraint；μ and σ be hard constraint and
Voltage gets over bound function average and standard deviation between softening constraint.
The voltage according to power distribution network node crosses the border the distribution that situation is accessed to distributed photovoltaic power generation access node
Photovoltaic generation voltage be ranked up including：
When node voltage crosses the coboundary that voltage is constrained after hard constraint softening, distributed photovoltaic power generation access node is connect
The distributed photovoltaic power generation voltage V enteredjDescending is arranged, and records corresponding node serial number；
When node voltage crosses the lower boundary that voltage is constrained after hard constraint softening, distributed photovoltaic power generation access node is connect
The distributed photovoltaic power generation voltage V enteredjAscending order is arranged, and records corresponding node serial number.
Calculating the reactive power increment of the distributed photovoltaic power generation of the distributed photovoltaic power generation access node access includes：
According to node voltage increment Delta ViWith multiplying for the reactive voltage sensitibility reciprocal of distributed photovoltaic power generation access node
Product determines the actual reactive power increment of the distributed photovoltaic power generation of distributed photovoltaic power generation access node access.
The wattful power of the distributed photovoltaic power generation for calculating the distributed photovoltaic power generation access node access ranked the first
Rate increment includes：
According to node voltage increment Delta ViWith the product of distributed photovoltaic power generation access node active voltage sensitibility reciprocal
Determine the actual active power increment of the distributed photovoltaic power generation of distributed photovoltaic power generation access node access.
Node voltage increment Delta ViCalculating include：
When node voltage crosses the voltage constraint coboundary after hard constraint softening, Δ Vi=Vsu-Vi；
When node voltage crosses the voltage constraint lower boundary after hard constraint softening, Δ Vi=Vsl-Vi
Wherein, ViFor the voltage swing of power distribution network node i, VsuVoltage after softening for hard constraint constrains coboundary, VslFor
Voltage constraint lower boundary after hard constraint softening.
The calculating of the reactive voltage sensitivity of the distributed photovoltaic power generation access node includes：
Change the reactive power of individual node injection；
Node voltage before and after being changed according to distribution power system load flow calculation；
The ratio of voltage increment and injection reactive power increment before and after changing is the reactive voltage sensitivity of node；
The calculating of the distributed photovoltaic power generation access node active voltage sensitivity includes：
Change the active power of individual node injection；
Node voltage before and after being changed according to Load flow calculation；
The ratio of the active power increment of voltage increment and injection before and after changing is the active voltage sensitivity of node.
The reactive power increment adjustable range such as following formula of the distributed photovoltaic of distributed photovoltaic power generation access node access：
Qlb,j≤Q0,j+ΔQj≤Qub,j
In formula, Q0,jRepresent the idle output before photovoltaic generation j regulations, Δ QjRepresent that photovoltaic generation j reactive power increases
Amount, Qlb,j、Qub,jPhotovoltaic generation maximum exportable capacitive reactive power and lagging reactive power are represented respectively.
The present invention provides a kind of control system of distribution network voltage containing distributed photovoltaic power generation, including：
Cross the border determining module, the situation of crossing the border for determining power distribution network node voltage；
Order module：For the distributed photovoltaic power generation that is accessed according to the situation of crossing the border of power distribution network node voltage to node
Grid entry point voltage is ranked up；
Control instruction module：The distribution that the distributed photovoltaic power generation access node ranked the first is accessed is calculated according to sequence
The reactive power increment of photovoltaic generation, judges the reactive power increment whether in adjustable range, if if with the node
The control instruction that reactive power increment is exported as distributed photovoltaic power generation；If not judging next node if, until choosing
Node of the reactive power increment of the distributed photovoltaic power generation of access in adjustable range；If the distributed light of all node accesses
The reactive power increment generated electricity is lied prostrate not in adjustable range, then the node ranked the first after selected and sorted is electric to participate in power distribution network
The node of voltage-controlled system, the control instruction exported using the active power increment of the node as distributed photovoltaic power generation.
With immediate prior art ratio, the technical scheme that the present invention is provided has the advantages that：
The technical scheme that the present invention is provided, the load data without concentrating the line parameter circuit value for measuring the whole network, each node, and increase
The utilization to the reactive power regulating power of distributed photovoltaic power generation is added, quickly power distribution network node voltage can have been controlled
System, so, it can be very good node voltage control under different distribution network operation situations in defined safe range.In electricity
While voltage-controlled processed, the influence exerted oneself to photovoltaic generation, and the dependence to other distribution network voltage adjustment equipments are reduced, is carried
High economy.
Brief description of the drawings
Fig. 1 is a kind of control method flow chart of distribution network voltage containing distributed photovoltaic power generation of the present invention；
Fig. 2 is that power distribution network node reactive power of embodiment of the present invention voltage sensibility solves schematic diagram；
Fig. 3 is distributed photovoltaic power generation of embodiment of the present invention reactive power and active power regulation ability schematic diagram；
Fig. 4 is that 33 node system provided in an embodiment of the present invention accesses distributed photovoltaic power generation schematic diagram；
Fig. 5 is that example voltages provided in an embodiment of the present invention control final result schematic diagram.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and accompanying drawing, to this
Invention is described in further details.Here, the schematic description and description of the present invention is used to explain the present invention, but do not make
For limitation of the invention.
As shown in figure 1, the present invention provides a kind of control method of distribution network voltage containing distributed photovoltaic power generation, including：
Determine the situation of crossing the border of power distribution network node voltage；
The distributed photovoltaic accessed according to the situation of crossing the border of power distribution network node voltage to distributed photovoltaic power generation access node
Generating voltage is ranked up；
The nothing for the distributed photovoltaic power generation that the distributed photovoltaic power generation access node ranked the first is accessed is calculated according to sequence
Work(power increment, judges the reactive power increment whether in adjustable range, if the distributed light accessed if with the node
The control instruction that the reactive power increment that volt generates electricity is exported as distributed photovoltaic power generation；Judged successively according to sequence if not if
Remaining node, until choosing node of the reactive power increment of the distributed photovoltaic power generation of access in adjustable range；If all
The reactive power increment of the distributed photovoltaic power generation of node access then ranks the first not in adjustable range after selected and sorted
Node for participate in distribution network voltage control node, using the node access distributed photovoltaic power generation active power increment as
The control instruction of distributed photovoltaic power generation output.
Below in conjunction with the accompanying drawings, the embodiment to the present invention is described in further detail.
Before description invention is implemented, following explanation is first carried out：
Following examples of the present invention are suitable for radiant type power distribution network, wherein the radiant type power distribution network, with following characteristics：
1) comprising a feeder line；
2) feeder line includes a major network power supply；
3) feeder line includes multiple feeder line sections；
4) at least one feeder line section includes at least one distributed photovoltaic power generation；
5) normal time open loop operation between feeder line section.
Wherein, the distributed photovoltaic power generation, with following characteristics：
1) distribution network is accessed by inverter；
2) distributed photovoltaic power generation control method controls for power-type；
Present example discloses a kind of control method of distribution network voltage containing distributed photovoltaic power generation, mainly includes：Analysis
The too high or too low situation of crossing the border of the supply voltage of each node of power distribution network；Require to obtain the voltage for needing to reach according to quality of voltage
Increment；Corresponding sequence is carried out to the access node voltage of the controllable photovoltaic of each power according to voltage situation of crossing the border；According to each distribution
The analysis of idle or active power tunability and judgement of formula photovoltaic generation may participate in the node of line voltage control；According to target
The idle or active increment that node voltage increment and controlled node sensitivity obtain the photovoltaic of node access is used as each photovoltaic generation
Control instruction.
According to following model g (Vi) determine the situation of crossing the border of the power distribution network node voltage：
In formula：ViFor the voltage swing of power distribution network node i, V0For power distribution network rated voltage size；By power distribution network node voltage
Maximum Vhu, minimum value VhlThe hard constraint for situation of being crossed the border as determination voltage, VhlIt is following for power distribution network node voltage hard constraint
Boundary, VhuFor power distribution network node voltage hard constraint coboundary；VslVoltage after softening for hard constraint constrains lower boundary, VsuFor firmly about
Voltage constraint coboundary after beam softening；ωvCrossed the border penalty factor for hard constraint；μ and σ is electricity between hard constraint and softening constraint
Pressure gets over bound function average and standard deviation.
The voltage of each node and border are compared, because voltage gets over bound function minimum in the bounds after softening
It is zero, therefore by destination node voltage V to be controllediWith formula (1) two hard constraint border, i.e. VhlAnd Vhu, after softening
Border VslAnd VsuIt is compared, when overtension crosses the border, is calculated by following formula and obtain negative voltage increment：ΔVi=Vsu-Vi；
When brownout crosses the border, calculated by following formula and obtain positive voltage increment：ΔVi=Vsl-Vi.The voltage increment is as following
Voltage-controlled ideal expectation value.
The voltage V of the node accessed to each distributed photovoltaic power generationj(j=1,2 ..., NPV) be ranked up, NPVFor distribution
Photovoltaic generation access node number.
According to voltage ViDifferent situations of crossing the border, the process of implementing is：If ViIt is too high, then due to now power network
Integral node voltage ratio is higher, then voltage higher node voltage and ViIt is more nearly, so as to be more easy to when adjusting power injection
To ViInfluence is produced, therefore, to different VjCarry out descending arrangement；In addition, if ViIt is too low, then due to the overall electricity of now power network
Pressure ratio is relatively low, then voltage lower node voltage and ViIt is more nearly, so as to be more easy to when adjusting power injection to ViProduce shadow
Ring, therefore, to VjCarry out ascending order arrangement.
In an embodiment of the present invention, control voltage reaches the degree that allowed band is crossed the border according to voltage, total regulation time
Number is not once to complete, and is constantly changed with the Parameters variation of power network mainly due to actual sensitivity, and institute of the present invention
The sensitivity stated is that calculated in advance is obtained, and can not be fully achieved by once realizing desired voltage increment.
By taking reactive voltage sensitivity as an example, it implements process and is：As shown in Fig. 2 the V in figurej,kRepresent the k moment
Point j voltage, Vj,k+1Represent k+1 moment nodes j voltage, Qj,kRepresent that the k moment injects node j reactive power, Qj,k+1Table
Show that the k+1 moment injects node j reactive power, Δ Vj,kRepresent k moment posterior nodal points j voltage increment, Δ Qj,kRepresent after the k moment
The reactive power increment of generation；Under the grid condition of some time discontinuity surface, it is believed that the voltage change of the node is due to this node
Power injection change causes, and for node j, the calculation formula of its reactive voltage sensitivity is：Similar, have
Work(voltage sensibility can also be expressed as：V in formulajRepresent node j voltage, PjRepresent node j active power of output.
Idle or active voltage sensitivity method for expressing as described above, its implication is：Under actual motion scene, some
Idle or active injection of the voltage of power distribution network node not only with this node is active, while idle with other power distribution network nodes
Or it is active relevant.In an embodiment of the present invention, the influence factor for taking the voltage influence to the node maximum.
For the described control method of distribution network voltage containing distributed photovoltaic power generation, exerted oneself with photovoltaic needs more than network load
Ask, and exemplified by causing that node voltage is too high and crossing the border, destination node to be controlled now is i, and the voltage increment of its ideal expectation is
ΔVi, and voltage highest node is j after sorted, the nothing preferentially exported by the distributed photovoltaic power generation accessed to j nodes
Work(power is adjusted, and required output reactive power incremental computations formula is：
In addition, as shown in figure 3, the P in figure represents active power of output ,+Q is represented to export lagging reactive power, and-Q is represented
Export capacitive reactive power, QlbRepresent the maximum of output capacitive reactive power, QubRepresent the maximum of output lagging reactive power
Value, O represents the operating point of distributed photovoltaic power generation.The reactive power that the distributed photovoltaic power generation of node j accesses is actual adjusts energy
Power can be shown by the power circle diagram of the combining inverter, when the idle increment needed for generation, it is necessary to carry out tunability
Judgement, in the embodiments herein, when voltage cross the border degree it is little when, required idle increment is within adjustable extent, then
Node j access distributed photovoltaic power generation it is current reactive power output calculation formula be：Qj,k+1=Qj,k+ΔQj,k, Q in formulaj,k
Represent that the k moment injects node j reactive power, Qj,k+1Represent that the k+1 moment injects node j reactive power.
The process that the present invention adjusts reactive voltage as described above is used as a wheel voltage control circulation.Due to the tide of power network
Stream is transient change, therefore, and subsequent time is the k+1 moment, the voltage of each node can be known in real time, hence into next
The voltage control circulation of wheel.
For the power distribution network of the radiant type operation of the applicable many feeder line sections of the present invention, for each feeder line section at least one
Individual node accesses a certain proportion of distributed photovoltaic power generation, after the voltage control circulation by a wheel, if there is another
The voltage V of the different nodes of feeder line sectionl,k+1Too high and cross the border, then required voltage increment is obtained by calculating：ΔVl,k+1=
Vsu-Vl,k+1；According to the voltage descending of photovoltaic access node, node m to be controlled is selected, now required idle increment is For node m reactive voltage sensitivity；And due to the constraint of its idle fan-out capability,
The idle increment Delta Q that can be providedm,allow,k+1Obtained by calculating：ΔQm,allow,k+1=Qlb,m-Qm,k+1, so that remaining is electric
Press increment Delta Vl,remaining,k+1Obtained by calculating：Need by right
The control of other photovoltaics reaches.
The idle or active power tunability of distributed photovoltaic power generation is：
-P0,j≤ΔPj≤PMPP,j-P0,j (2)
In formula, P0,jRepresent the active output before photovoltaic generation j regulations, Δ PjRepresent that photovoltaic generation j active output is adjusted
Section amount, PMPP,jRepresent the active power that photovoltaic generation j maximums can be exported under current power generation settings；
Qlb,j≤Q0,j+ΔQj≤Qub,j (3)
In formula, Q0,jRepresent the idle output before photovoltaic generation j regulations, Δ QjRepresent that photovoltaic generation j idle output is adjusted
Section amount, Qlb,j、Qub,jPhotovoltaic maximum exportable capacitive reactive power and lagging reactive power are represented respectively；
In formula, SjRepresent photovoltaic generation j inverter rated capacity.
Voltage descending as described above, in the control cyclic process of epicycle voltage, is adjusted because the photovoltaic of the first order is idle
Energy-conservation power is not enough to provide all destination node voltage increment demands, from the angle for improving voltage control efficiency, selects same
The photovoltaic access node x of the second order in individual sequence, the voltage for continuing epicycle by its Reactive-power control ability controls to circulate.Root
According to voltage increment needed for remaining destination node l, the reactive power increment that the needs offer of node x photovoltaics is obtained by calculating is：So photovoltaic x idle output is obtained by calculating：Qx,k+2=Qx,k+1+ΔQx,k+1。
Exerted oneself for photovoltaic as described above more than the scene of workload demand, the degree crossed the border if node voltage is too high
It is more serious, it is considered to a kind of situation, i.e., for all nodes (j=1,2 ..., NPV) access photovoltaic, by r wheel voltage control
Afterwards, its reactive power is output as：Qj,k+r=Qlb,j, all reached boundary value；Now, from line voltage safety angle, it is necessary to
Cut down the photovoltaic active power output of part.
For scene as described above, now, voltage increment ideal expectation value is needed for destination node voltage to be controlled：Δ
Ve,k+r=Vsu-Ve,k+r, and each photovoltaic access node voltage descending, the first order is node j.
According to node j active voltage sensitivity, now active power output increment needed for node j photovoltaics is by calculating
For：Then r is taken turns in voltage control process, and the active power of node j photovoltaics is output as：Pj,k+r+1=
Pj,k+r+ΔPj,k+r.In scene as described above, it have passed through what photovoltaic generation was exported to reactive power output and active power
Regulation, can realize that voltage control is required under the too high more upper bound situation of distribution network voltage, meets safety code and specific power network fortune
Requirement of the row to power voltage supply quality.
Exerted oneself the relative size relation between workload demand, power distribution network node when there is photovoltaic generation operation according to photovoltaic
Brownout and the more situation of lower bound, this situation is compared with voltage as described above is controlled：Principle is identical, process is close；In addition,
You need to add is that under the scene of such brownout, the active voltage that each node photovoltaic can not participate in power distribution network was controlled
Journey.
Specifically, the present embodiment represents a distribution network simulation containing distributed photovoltaic power generation with 33 node system figures
Wiring diagram, reference capacity is 10MVA, as shown in figure 4, distributed photovoltaic power generation access node (grid entry point) is node 11, node
15th, node 30 and node 32, its rated power perunit value is respectively 0.1p.u., 0.1p.u., 0.1p.u. and 0.12p.u..Institute
The active reactive power peak sum for having node load is：3.715MW+j2.3MVar, provides that the power distribution network node voltage is hard about
Beam up-and-down boundary is respectively 1.1p.u. and 0.9p.u., and the voltage border bound that can allow after softening is 1.048p.u.
And 0.952p.u..
Each round node electricity in the case of this example is mainly exerted oneself more than workload demand according to above-mentioned steps to photovoltaic generation
Voltage increment calculating, each round voltage control process control object and voltage control result after pressure is crossed the border carry out instance analysis.
Wherein, each distributed photovoltaic power generation it is actual exert oneself relative to nominal output ratio be 0.8, load actually active demand relative to
The ratio of peak value active power is 0.28, and the actual reactive requirement of load is 0.28 relative to the ratio of peak value reactive power.
Other parameters are as follows, and the voltage as described in above-mentioned formula (1) gets over bound function, and μ and σ take 1.0 respectively in this example
With 0.2.Boundary constraint that distributed photovoltaic power generation is idle is Qlb,j=-0.3Sj, Qub, j=0.3Sj。
It is as a result as shown in the table by calculating.
The voltage control process of table 1 and each distributed photovoltaic power generation control variable
As shown in Table 1, it is actual to experienced the control of 5 wheel voltages altogether, finally whole network voltage is crossed the border in the precision of permission
Within the scope of.As shown in figure 5, after overvoltage control, the voltage of each node of power distribution network within the range of permission, and in order to
Such effect is reached, the active reactive output result of each final Node distribution formula photovoltaic generation is as shown in the table.
Each distributed photovoltaic power generation active reactive output result of table 2
| Node serial number | 11 | 15 | 30 | 32 |
| Active output/p.u. | 0.08000 | 0.08000 | 0.08000 | 0.09600 |
| Idle output/p.u. | -0.007656 | -0.03000 | 0 | -0.03600 |
As shown in table 2, above under set scene, distributed photovoltaic power generation tends to export capacitive reactive power,
So as to be conducive to the regulation to overtension.
Interpretation of result
(1) as shown in table 1 to table 2, by the power adjusting amount and voltage descending rank results of each round, select first to mesh
Mark node voltage and control best photovoltaic node, followed by judge whether the photovoltaic has reactive power capability to participate in regulation, really finally
Surely voltage-controlled photovoltaic is participated in and required output regulated quantity.This method keeps highest effect in voltage control each time
Rate, so as to ensure that the efficiency of global voltage control.
(2) in containing distributed photovoltaic power generation power distribution network, existing distributed photovoltaic power generation is utilized, it is allowed to which it participates in electricity
The voltage control of net, can improve the situation of overtension or brownout, ensure the power supply of power distribution network in certain degree
Voltage within the range of permission, improves the ability that power distribution network receives distributed photovoltaic power generation, reduces and other power networks are adjusted
Save the dependence and requirement of equipment.
Based on identical theory, the present invention provides a kind of control system of distribution network voltage containing distributed photovoltaic power generation, described
System can include：
Cross the border determining module, the situation of crossing the border for determining power distribution network node voltage；
Order module：For the distributed photovoltaic power generation that is accessed according to the situation of crossing the border of power distribution network node voltage to node
Grid entry point voltage is ranked up；
Control instruction module：The distribution that the distributed photovoltaic power generation access node ranked the first is accessed is calculated according to sequence
The reactive power increment of photovoltaic generation, judges the reactive power increment whether in adjustable range, if if with the node
The control instruction that reactive power increment is exported as distributed photovoltaic power generation；If not judging next node if, until choosing
Node of the reactive power increment of the distributed photovoltaic power generation of access in adjustable range；If the distributed light of all node accesses
The reactive power increment generated electricity is lied prostrate not in adjustable range, then the node ranked the first after selected and sorted is electric to participate in power distribution network
The node of voltage-controlled system, the control instruction exported using the active power increment of the node as distributed photovoltaic power generation.
The determining module of crossing the border is according to following model g (Vi) determine the situation of crossing the border of the power distribution network node voltage：
The order module crosses the border situation to the access of distributed photovoltaic power generation access node according to the voltage of power distribution network node
Distributed photovoltaic power generation voltage be ranked up including：
When node voltage crosses the coboundary that voltage is constrained after hard constraint softening, distributed photovoltaic power generation access node is connect
The distributed photovoltaic power generation voltage V enteredjDescending is arranged, and records corresponding node serial number；
When node voltage crosses the lower boundary that voltage is constrained after hard constraint softening, distributed photovoltaic power generation access node is connect
The distributed photovoltaic power generation voltage V enteredjAscending order is arranged, and records corresponding node serial number.
The control instruction module calculates the distributed photovoltaic power generation output of distributed photovoltaic power generation access node access
Reactive power increment includes：
According to node voltage increment Delta ViWith multiplying for the reactive voltage sensitibility reciprocal of distributed photovoltaic power generation access node
Product determines the actual reactive power increment of the distributed photovoltaic power generation of distributed photovoltaic power generation access node access.
The calculating of the active power increment of the distributed photovoltaic power generation output includes：
According to node voltage increment Delta ViWith the product of distributed photovoltaic power generation access node active voltage sensitibility reciprocal
Determine the actual active power increment of the distributed photovoltaic power generation of distributed photovoltaic power generation access node access.
Node voltage increment Delta ViCalculating include：
When node voltage crosses the voltage constraint coboundary after hard constraint softening, Δ Vi=Vsu-Vi；
When node voltage crosses the voltage constraint lower boundary after hard constraint softening, Δ Vi=Vsl-Vi
Wherein, ViFor the voltage swing of power distribution network node i, VsuVoltage after softening for hard constraint constrains coboundary, VslFor
Voltage constraint lower boundary after hard constraint softening.
The calculating of the reactive voltage sensitivity of the distributed photovoltaic power generation access node includes：
Change the reactive power of individual node injection；
Node voltage before and after being changed according to distribution power system load flow calculation；
The ratio of voltage increment and injection reactive power increment before and after changing is the reactive voltage sensitivity of node；
The calculating of the distributed photovoltaic power generation access node active voltage sensitivity includes：
Change the active power of individual node injection；
Node voltage before and after being changed according to Load flow calculation；
The ratio of the active power increment of voltage increment and injection before and after changing is the active voltage sensitivity of node.
The reactive power increment adjustable range such as following formula of the distributed photovoltaic of distributed photovoltaic power generation access node access：
Qlb,j≤Q0,j+ΔQj≤Qub,j
In formula, Q0,jRepresent the idle output before photovoltaic generation j regulations, Δ QjRepresent that photovoltaic generation j reactive power increases
Amount, Qlb,j、Qub,jPhotovoltaic generation maximum exportable capacitive reactive power and lagging reactive power are represented respectively.
It should be understood by those skilled in the art that, embodiments herein can be provided as method, system or computer program
Product.Therefore, the application can be using the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Apply the form of example.Moreover, the application can be used in one or more computers for wherein including computer usable program code
The computer program production that usable storage medium is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The application is the flow with reference to method, equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram are described.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram
Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which is produced, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that in meter
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, thus in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
Finally it should be noted that：Above example is merely to illustrate technical scheme rather than to its protection domain
Limitation, although the application is described in detail with reference to above-described embodiment, those of ordinary skill in the art should
Understand：Those skilled in the art read after the application the embodiment of application can still be carried out a variety of changes, modification or
Person's equivalent substitution, but these changes, modification or equivalent substitution, are applying within pending claims.
Claims (10)
1. a kind of control method of distribution network voltage containing distributed photovoltaic power generation, it is characterised in that including：
Determine the situation of crossing the border of power distribution network node voltage；
The distributed photovoltaic power generation accessed according to the situation of crossing the border of power distribution network node voltage to distributed photovoltaic power generation access node
Voltage is ranked up；
The idle work(for the distributed photovoltaic power generation that the distributed photovoltaic power generation access node ranked the first is accessed is calculated according to sequence
Rate increment, judges the reactive power increment whether in adjustable range, is sent out if the distributed photovoltaic accessed if with the node
The control instruction that the reactive power increment of electricity is exported as distributed photovoltaic power generation；If remaining according to sequence successively judgement not if
Node, until choosing node of the reactive power increment of the distributed photovoltaic power generation of access in adjustable range；If all nodes
The reactive power increment of the distributed photovoltaic power generation of access calculates the distributed photovoltaic ranked the first not in adjustable range, then
The active power increment of the distributed photovoltaic power generation of generating access node access, and the distributed photovoltaic power generation accessed with the node
The control instruction that is exported as distributed photovoltaic power generation of active power increment.
2. the control method of distribution network voltage containing distributed photovoltaic power generation according to claim 1, it is characterised in that under
State model g (Vi) determine the situation of crossing the border of the power distribution network node voltage：
In formula：ViFor the voltage swing of power distribution network node i, V0For power distribution network rated voltage size；VhlIt is hard for power distribution network node voltage
Constrain lower boundary, VhuFor power distribution network node voltage hard constraint coboundary；VslVoltage after softening for hard constraint constrains lower boundary,
VsuVoltage after softening for hard constraint constrains coboundary；ωvCrossed the border penalty factor for hard constraint；μ and σ is hard constraint and softened about
Voltage gets over bound function average and standard deviation between beam.
3. the control method of distribution network voltage containing distributed photovoltaic power generation according to claim 1, it is characterised in that described
The distributed photovoltaic power generation voltage that distributed photovoltaic power generation access node is accessed is entered according to the voltage of power distribution network node situation of crossing the border
Row sequence includes：
When node voltage crosses the coboundary that voltage is constrained after hard constraint softening, distributed photovoltaic power generation access node is accessed
Distributed photovoltaic power generation voltage VjDescending is arranged, and records corresponding node serial number；
When node voltage crosses the lower boundary that voltage is constrained after hard constraint softening, distributed photovoltaic power generation access node is accessed
Distributed photovoltaic power generation voltage VjAscending order is arranged, and records corresponding node serial number.
4. the control method of distribution network voltage containing distributed photovoltaic power generation according to claim 1, it is characterised in that calculate institute
Stating the reactive power increment of the distributed photovoltaic power generation of distributed photovoltaic power generation access node access includes：
According to node voltage increment Delta ViDetermined with the product of the reactive voltage sensitibility reciprocal of distributed photovoltaic power generation access node
The actual reactive power increment of the distributed photovoltaic power generation of distributed photovoltaic power generation access node access.
5. the control method of distribution network voltage containing distributed photovoltaic power generation according to claim 1, it is characterised in that the meter
The active power increment of the distributed photovoltaic power generation of the distributed photovoltaic power generation access node access ranked the first includes：
According to node voltage increment Delta ViDetermine to divide with the product of distributed photovoltaic power generation access node active voltage sensitibility reciprocal
The actual active power increment of the distributed photovoltaic power generation of cloth photovoltaic generation access node access.
6. the control method of distribution network voltage containing distributed photovoltaic power generation according to claim 4 or 5, it is characterised in that section
Point voltage increment Δ ViCalculating include：
When node voltage crosses the voltage constraint coboundary after hard constraint softening, Δ Vi=Vsu-Vi；
When node voltage crosses the voltage constraint lower boundary after hard constraint softening, Δ Vi=Vsl-Vi
Wherein, ViFor the voltage swing of power distribution network node i, VsuVoltage after softening for hard constraint constrains coboundary, VslFor firmly about
Voltage constraint lower boundary after beam softening.
7. the control method of distribution network voltage containing distributed photovoltaic power generation according to claim 4, it is characterised in that described point
The calculating of the reactive voltage sensitivity of cloth photovoltaic generation access node includes：
Change the reactive power of individual node injection；
Node voltage before and after being changed according to distribution power system load flow calculation；
The ratio of voltage increment and injection reactive power increment before and after changing is the reactive voltage sensitivity of node.
8. the control method of distribution network voltage containing distributed photovoltaic power generation according to claim 5, it is characterised in that described point
The calculating of cloth photovoltaic generation access node active voltage sensitivity includes：
Change the active power of individual node injection；
Node voltage before and after being changed according to Load flow calculation；
The ratio of the active power increment of voltage increment and injection before and after changing is the active voltage sensitivity of node.
9. the control method of distribution network voltage containing distributed photovoltaic power generation according to claim 1, it is characterised in that
The reactive power increment adjustable range such as following formula of the distributed photovoltaic of distributed photovoltaic power generation access node access：
Qlb,j≤Q0,j+ΔQj≤Qub,j
In formula, Q0,jRepresent the idle output before photovoltaic generation j regulations, Δ QjPhotovoltaic generation j reactive power increment is represented,
Qlb,j、Qub,jPhotovoltaic generation maximum exportable capacitive reactive power and lagging reactive power are represented respectively.
10. a kind of control system of distribution network voltage containing distributed photovoltaic power generation, it is characterised in that including：
Cross the border determining module, the situation of crossing the border for determining power distribution network node voltage；
Order module：For the grid-connected of the distributed photovoltaic power generation that is accessed according to the situation of crossing the border of power distribution network node voltage to node
Point voltage is ranked up；
Control instruction module：The distributed photovoltaic that the distributed photovoltaic power generation access node ranked the first is accessed is calculated according to sequence
The reactive power increment of generating, judges the reactive power increment whether in adjustable range, if if with the idle of the node
The control instruction that power increment is exported as distributed photovoltaic power generation；If not judging next node if, until choosing access
Distributed photovoltaic power generation node of the reactive power increment in adjustable range；If the distributed photovoltaic hair of all node accesses
The reactive power increment of electricity is not in adjustable range, then the node ranked the first after selected and sorted is participation distribution network voltage control
The node of system, the control instruction exported using the active power increment of the node as distributed photovoltaic power generation.
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