CN106229965B - The network line structural planning method and device of power network - Google Patents

The network line structural planning method and device of power network Download PDF

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Publication number
CN106229965B
CN106229965B CN201610602411.7A CN201610602411A CN106229965B CN 106229965 B CN106229965 B CN 106229965B CN 201610602411 A CN201610602411 A CN 201610602411A CN 106229965 B CN106229965 B CN 106229965B
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power
node
network
megawatt
kilometer
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CN106229965A (en
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张翔
陈政
冷媛
王玲
蒙文川
席云华
宋艺航
傅蔷
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Research Institute of Southern Power Grid Co Ltd
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Power Grid Technology Research Center of China Southern Power Grid Co Ltd
Research Institute of Southern Power Grid Co Ltd
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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
    • 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]

Abstract

The present invention relates to a kind of network line structural planning method and device of power network,According to the power variation and length of each network line,Obtain the exchange megawatt kilometer of each node in power network,The length of DC line is shared to each generating node for tracing into and each load bus for tracing into,To obtain the direct current length contributory value of each node in power network,Length is shared according to direct current,Calculate the direct current megawatt kilometer of each node in power network,The exchange megawatt kilometer of each node is added with the direct current megawatt kilometer of each node,Obtain total megawatt of kilometer of each node,Total megawatt of kilometer considers exchange megawatt kilometer and direct current megawatt kilometer,So as to each region transmission of electricity wheeling rates for calculating are more reasonable,According to the transmission of electricity of each region wheeling rates and newly-increased node,Plan the network line structure of power network,Because each region transmission of electricity wheeling rates are more reasonable,Be conducive to planning that newly-increased node is connected to ensure newly-increased node economic benefit with the node in which region,So as to,Newly-increased node is set reasonably to plan to power network.

Description

The network line structural planning method and device of power network
Technical field
The present invention relates to electric power network technical field, the network line structural planning method and dress of more particularly to a kind of power network Put.
Background technology
The determination of transmission of electricity wheeling rates is the key link in electricity market, is also the important of China's current power market reform Task, under new power market reform background, for the situation that China's electric network composition is complicated, obtains rational transmission of electricity wheeling rates Planning to electric network composition is particularly important.At present, the method that existing transmission of electricity wheeling rates are calculated has postage stamp method, Tracing power flow Method, megawatt kilometer method and breadth coefficient etc..
But when carrying out transmission of electricity wheeling rates calculating by the above method, transmission line of alternation current is only accounted for, so as to carry out When transmission of electricity wheeling rates are calculated, transmission of electricity wheeling rates can be caused to calculate unreasonable.
The content of the invention
Based on this, it is necessary to for the irrational problem of wheeling rates, there is provided a kind of network line structure of rational power network Method and device for planning.
A kind of network line structural planning method of power network, comprises the following steps：
The length of the DC line and the network line in electricity grid network circuit is obtained, and by the DC line Rectification side is equivalent to load bus in both sides, obtains equivalent load node, and inverter side in the both sides of the DC line is equivalent It is generating node, obtains equivalent generating node；
The power for obtaining each node in the initial power and the power network of each network line increases unit megawatt hour The target power of each network line, according to the initial power and the target power of each network line, obtains The power variation of each network line is taken, according to the power variation and the grid line of each network line The length on road, obtains the exchange megawatt kilometer of each node in power network, wherein, each node includes load bus in power network And generating node；
Obtain the head end branch road being connected with the equivalent load node and the end being connected with the equivalent generating node Branch road, by Power Flow Tracing Method according to the head end branch road, traces into the generating that power is provided for the equivalent load node Node, by the Power Flow Tracing Method according to the end branch, traces into the reception equivalent generating node power output Load bus；
The length of the DC line is shared to each generating node for tracing into and each load bus for tracing into, is obtained The direct current length contributory value of each node in power taking net, according to the direct current length contributory value of each node in power network, calculates The direct current megawatt kilometer of each node in power network；
Respectively by the direct current megawatt kilometer of each node in the exchange megawatt kilometer and power network of each node in power network It is added, obtains total megawatt of kilometer of each node in power network, according to total megawatt of kilometer of each node in power network, obtains each Region megawatt kilometer；
Predetermined system enlarging coefficient and the preset security factor are obtained, coefficient, described pre- is extended according to the predetermined system If factor of safety and each region megawatt kilometer, each region transmission of electricity wheeling rates are calculated；
Newly-increased node is obtained, according to each region transmission of electricity wheeling rates and the newly-increased node, the power network is planned Network line structure.
The present invention also provides a kind of network line structural planning device of power network, including：
Equivalent modules, the length for obtaining the DC line in electricity grid network circuit and the network line, and will Rectification side is equivalent to load bus in the both sides of the DC line, equivalent load node is obtained, by the two of the DC line Inverter side is equivalent to generating node in side, obtains equivalent generating node；
Exchange megawatt kilometer acquisition module, for each in the initial power and the power network that obtain each network line The power of node increases the target power of each network line of unit megawatt hour, according to the described initial of each network line Power and the target power, obtain the power variation of each network line, according to each network line The length of power variation and the network line, obtains the exchange megawatt kilometer of each node in power network, wherein, power network In each node include load bus and generating node；
Tracking module, for obtain the head end branch road that is connected with the equivalent load node and with the equivalent section that generates electricity The connected end branch of point, by Power Flow Tracing Method according to the head end branch road, traces into as the equivalent load node is carried For the generating node of power, by the Power Flow Tracing Method according to the end branch, the reception equivalent generating is traced into The load bus of node power output；
Direct current megawatt kilometer acquisition module, for the length of the DC line to be shared to each generating node for tracing into And each load bus for tracing into, the direct current length contributory value of each node in power network is obtained, according to each in power network The direct current length contributory value of node, calculates the direct current megawatt kilometer of each node in power network；
Region megawatt kilometer acquisition module, for respectively by the exchange megawatt kilometer of each node in power network and power network The direct current megawatt kilometer of each node is added, and total megawatt of kilometer of each node in power network is obtained, according to each institute in power network Total megawatt of kilometer of node is stated, each region megawatt kilometer is obtained；
Transmission of electricity wheeling rates computing module, for obtaining predetermined system enlarging coefficient and the preset security factor, according to described Predetermined system enlarging coefficient, the preset security factor and each region megawatt kilometer, calculate each region transmission of electricity wheeling rates；
Planning module, for obtaining newly-increased node, according to each region transmission of electricity wheeling rates and the newly-increased node, rule Draw the network line structure of the power network.
The network line structural planning method and device of above-mentioned power network, according to the power variation and net of each network line The length on winding thread road, obtains the exchange megawatt kilometer of each node in power network, and the length of DC line is shared to what is traced into each Generating node and each load bus for tracing into, obtain the direct current length contributory value of each node, and the direct current according to each node is long Degree contributory value, calculates the direct current megawatt kilometer of each node in power network, by the exchange megawatt kilometer of each node in power network and power network The direct current megawatt kilometer of each node is added, and obtains total megawatt of kilometer of each node in power network, and total megawatt of kilometer of such node is The exchange megawatt kilometer of consideration it is contemplated that direct current megawatt kilometer so that, it is each that the total megawatt of kilometer subsequently according to node is calculated Region transmission of electricity wheeling rates are more reasonable, then, further according to each region transmission of electricity wheeling rates, newly-increased node are added in power network, to advise The network line structure of power network is drawn, is, according to each region transmission of electricity wheeling rates, newly-increased node to be planned into power network, to update electricity The structure of the transmission line of electricity of net, can so be conducive to that newly-increased node and which area planned due to each region transmission of electricity wheeling rates rationally Node in domain is connected to ensure newly-increased node economic benefit, so that, newly-increased node is reasonably planned to power network.
Brief description of the drawings
Fig. 1 is the flow chart of the network line structural planning method of the power network of an embodiment；
Fig. 2 be the power network of another embodiment network line structural planning method in obtain newly-increased node, according to each described Sub-process before the step of region transmission of electricity wheeling rates and the newly-increased node, network line structure of the planning power network Figure；
Fig. 3 is network line structure chart；
Fig. 4 is the module map of the network line structural planning device of the power network of an implementation method；
Fig. 5 is the submodule figure of the network line structural planning device of the power network of another implementation method.
Specific embodiment
Refer to Fig. 1, there is provided a kind of network line structural planning method of power network of embodiment, comprise the following steps：
S110：The length of the DC line and network line in electricity grid network circuit is obtained, and by the two of DC line Rectification side is equivalent to load bus in side, obtains equivalent load node, and inverter side in the both sides of DC line is equivalent to generate electricity Node, obtains equivalent generating node.
In power network, can typically there is a plurality of HVDC transmission line i.e. DC line to transmit direct current, then to carry The reasonability and accuracy of height transmission of electricity wheeling rates, need to consider DC line, so that, it is straight in acquisition electricity grid network circuit first Flow Line, and DC line is carried out equivalent, generally, the both sides of DC line are respectively rectification side and inverse in power network Become side, rectification side is equivalent to load bus, to obtain equivalent load node, inverter side is equivalent to generating node, to obtain Equivalent generating node, so temporarily can not consider the factor of DC line in electricity grid network.
S120：The power for obtaining each node in the initial power and power network of each network line increases each net of unit megawatt hour The target power on winding thread road, according to the initial power and target power of each network line, the power for obtaining each network line becomes Change amount, the length of power variation and network line according to each network line obtains the exchange megawatt of each node in power network Kilometer.
Wherein, each node includes load bus and generating node in power network.That is, not considering AC line temporarily Under conditions of the influence on road, the changed power of each network line is obtained when increasing by million power of unit watt by calculating each node Amount, then the power variation according to each network line is multiplied with the length of network line, calculates the exchange megawatt of each node Kilometer.Change after the exchange megawatt kilometer finger joint point increase unit megawatt of node to network totle drilling cost, network totle drilling cost is each The power of network line and the length product sum of network line.In power network, node can be divided into generating node and be born Lotus node, so that, in power network, each node includes load bus and generating node, and the rectification side of DC line is equivalent It is load bus, so that the equivalent load node for obtaining belongs to the load bus in power network, the inverter side of DC line is equivalent It is generating node, so that the equivalent load node for obtaining belongs to the load bus in power network.In the exchange megawatt kilometer of each node Exchange megawatt kilometer including equivalent generating node and equivalent load node.
S130：Obtain the head end branch road being connected with equivalent load node and the end branch being connected with equivalent generating node Road, by Power Flow Tracing Method according to head end branch road, traces into the generating node that power is provided for equivalent load node, by tide Stream tracking traces into the load bus for receiving equivalent generating node power output according to end branch.
In order to improve the reasonability and accuracy of transmission of electricity wheeling rates, it is necessary to consider DC line, accordingly it is desirable to find out with The connected circuit of DC line head end, that is, find out the head end branch road being connected with equivalent load node, by adverse current tracking, with Which generating node is track trace into for equivalent load node power output to generating node, and need to find out and DC line end The connected circuit in end, that is, find out the end branch being connected with equivalent generating node, by following current tracking, traces into load section Point, that is, trace into equivalent generating node for which load bus provides power.
S140：The length of DC line is shared to each generating node for tracing into and each load bus for tracing into, The direct current length contributory value of each node in power network is obtained, according to the direct current length contributory value of each node in power network, in calculating power network The direct current megawatt kilometer of each node.
The length of DC line is shared to each generating node for tracing into and each load bus for tracing into, due to Track to generating node and load bus may have multiple, so as to need the length by DC line share to trace into each Generating node and each load bus for tracing into.The length of every DC line is shared the length of each node in power network It is added, can obtain the direct current length contributory value of each node in power network, according to the direct current length contributory value of each node in power network, calculates The direct current megawatt kilometer of each node in power network, specifically, unit million is multiplied by by length is shared according to the direct current of each node in power network Power, calculates the direct current megawatt kilometer of each node in power network.
That is, the length of DC line to be given each generating node for tracing into and each load bus for tracing into Undertake, for example, the length of DC line is 100, if the amortization ratio to generating and load is set as 2 in advance：3, then by direct current The length 100 of circuit gives each load bus for tracing into each generating node and tracing into according to the amortization ratio respectively, i.e., directly In the length 100 of Flow Line 40 share and are undertaken to each generating node for tracing into, and remaining 60 is shared to each load for tracing into Node undertakes, that is, the direct current megawatt kilometer of each generating node for tracing into is then for 40 are multiplied by the power of unit million, and what is traced into is each negative The direct current megawatt kilometer of lotus node is then for 60 are multiplied by the power of unit million.Specifically, the length of every DC line is shared into section The direct current megawatt kilometer of point is added, and the direct current megawatt kilometer of node is can obtain, for example, above-mentioned direct current megawatt kilometer is 40 tracking The generating node for arriving is also relevant with another DC line, i.e., also for the equivalent load node of another DC line provides work( Rate, now, another length of DC line is 50, and it is 20 to share to the length of the generating node for tracing into, then have two The length of DC line has shares the above-mentioned generating node for tracing into, the direct current megawatt kilometer of the above-mentioned generating node for tracing into Share the direct current megawatt kilometer sum of the generating node for tracing into for the length of two DC lines.
The length of DC line is shared to each generating node for tracing into and each load section for tracing into by above-mentioned The direct current that point step can obtain each generating node for tracing into shares length and the direct current of each load bus for tracing into is shared Length, because generating node and load bus are the divisions of each node in power network, i.e., each node is to include generating node in power network And load bus, the direct current of each generating node that acquisition is traced into shares length and the direct current of each load bus for tracing into divides Stand length, is that the direct current for obtaining each generating node for tracing into and each load bus for tracing into each node of power network is shared Length, the load bus not traced into power network and the generating node not traced into are equivalently employed without sharing DC line Length, is equivalently employed without direct current megawatt kilometer so that, the direct current for knowing each generating node for tracing into share length and with Track to each load bus direct current share length after, you can know that the direct current of each node in power network shares length.
S150：The exchange megawatt kilometer of each node is added with the direct current megawatt kilometer of each node, the total of each node is obtained Megawatt kilometer, the total megawatt of kilometer according to each node obtains each region megawatt kilometer.
Total megawatt of kilometer of each node for obtaining is to consider exchange megawatt kilometer it is contemplated that direct current megawatt kilometer, according to Total megawatt of kilometer of each node, each region megawatt kilometer of acquisition is more rationally and accurate, so that, transmission of electricity wheeling rates can be improved and determined Reasonability and accuracy.
S160：Predetermined system enlarging coefficient and the preset security factor are obtained, coefficient, default peace are extended according to predetermined system Total divisor and each region megawatt kilometer, calculate each region transmission of electricity wheeling rates.
Predetermined system enlarging coefficient reflects the expense of unit length Typical Route, and the preset security factor reflects system to safety The cost of the system redundancy capacity that the requirement of nargin is caused, will each region megawatt kilometer carry out linear transformation to obtain each region defeated Electric wheeling rates, specifically, region transmission of electricity wheeling rates are that region megawatt kilometer, predetermined system enlarging coefficient and the preset security factor multiply Product.Total megawatt of kilometer of the node obtained by said process is the direct current megawatt kilometer and the sum for exchanging megawatt kilometer of node, The region megawatt kilometer obtained by total megawatt of kilometer of node equivalent to have also contemplated that direct current and exchange, then according to each region million It is more accurate and reasonable that watt kilometer obtains each region transmission of electricity wheeling rates.Each power generation region of power network and each load area are according to transmission of electricity Wheeling rates reclaim power cost, then, it is determined that after each region transmission of electricity wheeling rates, then the economic benefit in each region is also true therewith Fixed, each region transmission of electricity wheeling rates are more reasonable and accurate, and the economic benefit ratio in each region is more reasonable, and generating and user both sides are Preferable economic benefit can be obtained.
S170：Newly-increased node is obtained, according to the transmission of electricity of each region wheeling rates and newly-increased node, the network line of power network is planned Structure.
After the transmission of electricity wheeling rates to each region determine, when there is newly-increased node to need to be added in power network, in order to ensure The economic benefit of newly-increased node and the reasonability of power network, electricity is added to by according to each region transmission of electricity wheeling rates by newly-increased node Realize making rational planning for power network in net.
The network line structural planning method of above-mentioned power network, according to the power variation and network line of each network line Length, obtain power network in each node exchange megawatt kilometer, the length of DC line is shared to each generating section for tracing into Point and each load bus for tracing into, obtain the direct current length contributory value of each node, and the direct current length according to each node is shared Value, calculates the direct current megawatt kilometer of each node in power network, by each node in the exchange megawatt kilometer of each node in power network and power network Direct current megawatt kilometer be added, obtain total megawatt of kilometer of each node in power network, total megawatt of kilometer of such node is what is considered Exchange megawatt kilometer it is contemplated that direct current megawatt kilometer so that, each region that the total megawatt of kilometer subsequently according to node is calculated is defeated Electric wheeling rates are more reasonable, then, further according to each region transmission of electricity wheeling rates, newly-increased node are added in power network, to plan power network Network line structure, be according to each region transmit electricity wheeling rates, newly-increased node is planned into power network, to update the net of power network Winding thread line structure, can so be conducive to planning the section in newly-increased node and which region due to each region transmission of electricity wheeling rates rationally Point is connected to ensure newly-increased node economic benefit, so that, newly-increased node is reasonably planned to power network.
Wherein in one embodiment, the length of DC line is shared to each generating node for tracing into and traced into Each load bus, obtain the direct current length contributory value of each node in power network, direct current according to each node in power network point length stand Value, S140 includes the step of the direct current megawatt kilometer of each node in calculating power network：
The default generating of acquisition shares ratio with load；
The power partition coefficient of each head end branch road and the power distribution of each end branch are obtained by Power Flow Tracing Method Coefficient；
According to default generating and the work(for sharing ratio, the power partition coefficient of each head end branch road and each end branch of load Rate distribution coefficient, the length of DC line is shared to each generating node for tracing into and each load bus for tracing into, and is obtained The direct current length contributory value of each node in power taking net；
The direct current of each node in power network is shared into length to be multiplied with the power of unit million, the direct current million of each node in power network is obtained Watt kilometer.
When the power that multiple nodes are provided is received, it according to power partition coefficient is receiving power that each node is to node Node power is provided, which node can be traced for equivalent load node provides power by Power Flow Tracing Method, and can The power partition coefficient of the head end branch road that acquisition is connected with equivalent load node, the power partition coefficient of head end branch road is head end The power of branch road is to the sensitivity coefficient of equivalent load bus injecting power, i.e. power distribution of the equivalent load node on this branch road The factor, just may know that this distribution power of the equivalent load bus injecting power on the branch road.According to power partition coefficient, will be straight The length of Flow Line is shared to each generating node for tracing into and each load bus for tracing into, and obtains the direct current of each node Megawatt kilometer.For example, the length of DC line is 100, default generating is shared than being 2 with load：3, the length of DC line It is 40 to share to the length of each generating node for tracing into, and it is 60 to share to the length of each load bus for tracing into.AC line Allocation proportion of the power on road on head end branch road is the power partition coefficient of head end branch road, if the quantity of head end branch road is 2, And the power partition coefficient relative to DC line of two head end branch roads is 0.5, it is equivalent load to be due to head end branch road Node provides the node of power, is to connect generating node and equivalent load node, so that, it is 0.5 that head end branch road shares length 40 are multiplied by, similarly, if the quantity of the end branch for obtaining is 2, its power partition coefficient is respectively 0.4 and 0.6, then end branch The length shared is respectively 0.4 and is multiplied by 60 and 0.6 and is multiplied by 60.Then the direct current of each node in power network is shared into length and list Million power of position are multiplied, and obtain the direct current megawatt kilometer of each node in power network.
Wherein in one embodiment, respectively by power network each node exchange megawatt kilometer with power network each node it is straight Stream megawatt kilometer is added, and obtains total megawatt of kilometer of each node in power network, according to total megawatt of kilometer of each node in power network, obtains The step of each region megawatt kilometer, S150 included：
The exchange megawatt kilometer of each node in power network is added with the direct current megawatt kilometer of each node in power network respectively, is obtained Total megawatt of kilometer of each node in power network；
The power of each individual node accounts for the work(of individual node region interior nodes general power in each node in acquisition power network Rate ratio, according to total megawatt of kilometer of each node in the power proportions and power network of each individual node, obtains each region million respectively Watt kilometer.
In the present embodiment, megawatt kilometer is the change of every increase unit megawatt power network totle drilling cost, that is to say, that be cost Variable, region megawatt kilometer is that the total megawatt of weighted sum of kilometer of each node in region is average, wherein, total megawatt of kilometer of node Weight be the power of node, that is to say, that in a region, region megawatt kilometer is by total megawatt of public affairs of regional nodes In be multiplied by weight and sue for peace after divided by weight sum.Region megawatt kilometer be multiplied by predetermined system spreading coefficient and preset security because Son can obtain region transmission of electricity wheeling rates.
Wherein in one embodiment, region includes power generation region and load area, and each region transmission of electricity wheeling rates include Each power generation region transmission of electricity wheeling rates and each load area transmission of electricity wheeling rates.
Fig. 2 is referred to, newly-increased node is obtained, according to the transmission of electricity of each region wheeling rates and newly-increased node, the net of power network is planned Before the step of winding thread line structure S270, also include：
S261：According to each power generation region interior nodes general power and each power generation region transmission of electricity wheeling rates, power generation region is calculated Total transmission of electricity wheeling rates, according to each load area interior nodes general power and each load area transmission of electricity wheeling rates, calculated load area Total transmission of electricity wheeling rates in domain.
That is, power generation region may have multiple, the transmission of electricity wheeling rates of each power generation region and each power generation region interior nodes The general power sum of products calculates total transmission of electricity wheeling rates of power generation region, and load area may have multiple, the transmission of electricity of each load area Total transmission of electricity wheeling rates in wheeling rates and each load area interior nodes general power sum of products calculated load region.
S262：When always the transmit electricity ratio of wheeling rates of total transmission of electricity wheeling rates occupied area domain of load area is not equal to preset ratio When, modifying factor is set, according to modifying factor to total transmission of electricity wheeling rates and the net of always transmitting electricity of load area of power generation region Expense is modified respectively.
Wherein, region is always transmitted electricity total transmission of electricity wheeling rates of total transmission of electricity wheeling rates and the power generation region that wheeling rates are load area Sum.
When total transmission of electricity wheeling rates occupied area domain of load area always transmit electricity the ratio of wheeling rates be not equal to preset ratio when, that is, bear Total transmission of electricity wheeling rates in lotus region and total transmission of electricity wheeling rates of power generation region are unsatisfactory for the benefit ratio for generating electricity and load is obtained, Need to be modified it.
S263：Total transmission of electricity wheeling rates according to revised load area account for revised region and always transmit electricity the ratio of wheeling rates The example condition equal with preset ratio, calculates the value of modifying factor.
By introducing modifying factor, and it is total to account for revised region according to total transmission of electricity wheeling rates of revised load area Transmit electricity the ratio condition equal with preset ratio of wheeling rates, calculate the value of modifying factor, that is to say, that according to the amendment of acquisition It is full after the value of the factor is modified respectively to the total transmission of electricity wheeling rates and total transmission of electricity wheeling rates of load area to power generation region The benefit ratio that foot is generated electricity and load is obtained.
S264：According to the value of modifying factor, transmitted electricity to power generation region wheeling rates and load area transmission of electricity wheeling rates difference It is modified, obtains revised power generation region transmission of electricity wheeling rates and revised load area transmission of electricity wheeling rates.
After the value for obtaining modifying factor, according to the value of modifying factor, transmitted electricity to power generation region wheeling rates and loading zone Domain transmission of electricity wheeling rates are modified respectively, obtain revised power generation region transmission of electricity wheeling rates and revised load area is defeated Electric wheeling rates, so that the amendment to wheeling rates of transmitting electricity is realized, so that each region transmission of electricity wheeling rates are more rationally and accurate.
Wherein in one embodiment, the initial power of each network line is obtained, it is single in each node in acquisition power network respectively The power of individual node increases unit megawatt hour, the target power of each network line, initial power according to each network line and Target power, obtains the power variation of each network line, the power variation and network line according to each network line Length, S120 includes the step of the exchange megawatt kilometer of each node in acquisition power network：
The initial power of each network line is obtained, the power of individual node increases unit in each node in acquisition power network respectively Megawatt hour, the target power of each network line；
According to the initial power and target power of each network line, the power variation of each network line is obtained；
According to the default conversion factor of each network line, the length to each network line is converted respectively, obtains each net The datum length on winding thread road；
The power variation of network line is multiplied with the datum length of network line, the exchange million of each network line is obtained Watt kilometer variable quantity, the exchange megawatt kilometer variable quantity summation to each network line, obtains the exchange megawatt of each node in power network Kilometer.
Before exchange megawatt kilometer variable quantity is calculated, the certain type of network line of certain voltage class is selected first Used as benchmark, its length is constant, and the length of other kinds of networking circuit is multiplied by default conversion factor and obtains datum length, with true The length for protecting whole network circuit more meets reality, so that, the region transmission of electricity wheeling rates for calculating are more rationally accurate.For example, can On the basis of selected 400 kilovolts networking circuit, the default conversion factor of 275 kilovolts of networking circuit is 1.74,132 kilovolts of net The default conversion factor on winding thread road is 2.61.
The network line structural planning method of above-mentioned power network is illustrated with a specific embodiment below.
First, the network structure information of a node and network line is read from the file for prestoring, and obtains electricity Each area information in net, by counting each area information, can obtain the quantity of power generation region and the quantity of load area, and can The power and the length of network line of a node are obtained, length is converted using default conversion factor, by network line Length conversion on the basis of length.
Then, the initial power of each network line is obtained, the power for obtaining power network interior joint increases unit megawatt hour, each net The target power on winding thread road, according to the initial power and target power of each network line, the power for obtaining each network line becomes Change amount, the length of power variation and network line according to each network line obtains the exchange megawatt kilometer of node.Specifically Ground, the initial power according to each netting twine road is multiplied and sues for peace with corresponding datum length first, obtains basic megawatt of kilometer.
Each node increases the power of unit million, after the power that reference mode increases unit million, calculates new basic million Watt kilometer.
The exchange megawatt kilometer of power network interior joint is obtained by basic megawatt of new kilometer is subtracted into basic megawatt of kilometer.
The power partition coefficient of each head end branch road and the power distribution of each end branch are obtained by Power Flow Tracing Method Coefficient, the structure chart of network line as shown in Figure 3, wherein, AB is DC line, and DA, EA, AC, CB, BF and BG are exchange Circuit, can be equivalent to equivalent load node by node A, and alternating current circuit DA and EA provides power for node A, and node B is equivalent It is equivalent generating node, node B provides power, the length of DC line AB shared and gives node D, E, F for circuit BF and BG And G, and calculate the direct current megawatt kilometer of each node in power network, will the exchange megawatt kilometer of each node in power network it is each with power network The direct current megawatt kilometer of node is added, and total megawatt of kilometer of each node in power network is obtained, according to total megawatt of each node in power network Kilometer, obtains each region megawatt kilometer.
The exchange megawatt kilometer of each node in power network is added with the direct current megawatt kilometer of each node in power network, power network is obtained In each node total megawatt of kilometer, the power for obtaining node accounts for the power proportions of node region interior nodes general power, according to In power network in each node in the power proportions and power network of each individual node each node total megawatt of kilometer, each region is obtained respectively Megawatt kilometer.
Obtain predetermined system enlarging coefficient and the preset security factor, according to predetermined system extend coefficient, preset security because Sub and each region megawatt kilometer, calculates each region transmission of electricity wheeling rates, and specific formula is：
TG,h=mZone,G,h×E×S。
TD,m=mZone,D,m×E×S。
Wherein, TG,hIt is power generation region h transmission of electricity wheeling rates, mZone,G,hIt is h megawatts of kilometer of power generation region, TD,mIt is load area M transmission of electricity wheeling rates, mZone,D,mIt is m megawatts of kilometer of load area, E is that predetermined system extends coefficient, and S is the preset security factor, by It is unsatisfactory for requiring in the generating obtained according to each region transmission of electricity wheeling rates and the benefit ratio of load, then needs to transmit electricity each region Wheeling rates are modified.Specifically, first, transmitted electricity net according to each power generation region interior nodes general power and each power generation region Take, calculate total transmission of electricity wheeling rates of power generation region, transmitted electricity according to each load area interior nodes general power and each load area Expenses of surfing in Internet, total transmission of electricity wheeling rates in calculated load region.
When total transmission of electricity wheeling rates occupied area domain of load area always transmit electricity the ratio of wheeling rates be not equal to preset ratio when, set Total transmission of electricity wheeling rates of power generation region and total transmission of electricity wheeling rates of load area are entered by modifying factor respectively according to modifying factor Row is corrected, and specific formula is：
Wherein, region is always transmitted electricity total transmission of electricity wheeling rates of total transmission of electricity wheeling rates and the power generation region that wheeling rates are load area Sum.
According to total transmission of electricity wheeling rates R of revised load areaCT,DRevised region is accounted for always to transmit electricity wheeling rates (RCT,G+ RCT,D) ratio (p=RCT,D/(RCT,D+RCT,G)) share than equal condition with load with generating electricity, calculating modifying factor C Value, that is to say, that the total transmission of electricity wheeling rates to load area are modified, and the total transmission of electricity wheeling rates to power generation region are repaiied Just, so that, that is to say, that the ratio of wheeling rates of always being transmitted electricity to total transmission of electricity wheeling rates occupied area domain of load area is modified, and makes Total transmission of electricity wheeling rates R of revised load areaCT,DRevised region is accounted for always to transmit electricity wheeling rates (RCT,G+RCT,D) ratio (p=RCT,D/(RCT,D+RCT,G)) with generate electricity and load is shared than the same, RCT,GIt is always transmitting electricity for revised power generation region Expenses of surfing in Internet,It is power generation region h interior nodes general powers, total power generation region is G, total load area is D, PG,iIt is total hair The power of power generation region h interior joints i in electric region G,It is power generation region h interior joints sum in total power generation region G. It is load area m interior nodes general powers, PD,iIt is the power of total load area D intermediate load region m interior joints i,For total bears Lotus region D intermediate load region m interior joint sums.
According to the value of modifying factor C, to power generation region transmission of electricity wheeling rates mZone,G,hAnd load area transmission of electricity wheeling rates mZone,D,mIt is modified respectively, obtains revised power generation region transmission of electricity wheeling rates T 'G,hAnd revised load area transmission of electricity Wheeling rates T 'D,m, specific formula is：
T′G,h=(mZone,G,h+C)×E×S/1000。
T′D,m=(mZone,D,m-C)×E×S/1000。
Revised power generation region transmission of electricity wheeling rates and revised load area transmission of electricity wheeling rates are obtained, that is, is obtained Revised each region transmission of electricity wheeling rates were obtained, further according to revised each region transmission of electricity wheeling rates and newly-increased node, planning The network configuration of power network, that is, the network structure of power network is updated, newly-increased node is reasonably added in power network.
Refer to Fig. 4, there is provided a kind of network line structural planning device of power network of embodiment, including：
Equivalent modules 410, the length for obtaining DC line and network line in electricity grid network circuit, and will be straight Rectification side is equivalent to load bus in the both sides of Flow Line, equivalent load node is obtained, by inverter side in the both sides of DC line Generating node is equivalent to, equivalent generating node is obtained.
In power network, can typically there is a plurality of HVDC transmission line i.e. DC line to transmit direct current, then to carry The reasonability and accuracy of height transmission of electricity wheeling rates, need to consider DC line, so that, it is straight in acquisition electricity grid network circuit first Flow Line, and DC line is carried out equivalent, generally, the both sides of DC line are respectively rectification side and inverse in power network Become side, rectification side is equivalent to load bus, to obtain equivalent load node, inverter side is equivalent to generating node, to obtain Equivalent generating node, so temporarily can not consider the factor of DC line in electricity grid network.
Exchange megawatt kilometer acquisition module 420, for each node in the initial power and power network that obtain each network line Power increase each network line of unit megawatt hour target power, initial power and target work(according to each network line Rate, obtains the power variation of each network line, and the length of power variation and network line according to each network line is obtained The exchange megawatt kilometer of each node in power taking net, wherein, each node includes load bus and generating node in power network.
That is, under conditions of the influence for temporarily not considering DC line, unit is increased by calculating each node The power variation of each network line is obtained during watt million power, then according to the power variation and network line of each network line Length be multiplied, calculate the exchange megawatt kilometer of each node.After the exchange megawatt kilometer finger joint point of node increases unit megawatt Change to network totle drilling cost, network totle drilling cost is the length product sum of the power with network line of each network line.In electricity In net, node can be divided into generating node and load bus so that, in power network, each node include load bus and Generating node, and the rectification side of DC line is equivalent to load bus, so that during the equivalent load node for obtaining belongs to power network Load bus, the inverter side of DC line is equivalent to generating node, so that during the equivalent load node for obtaining belongs to power network Load bus.The exchange megawatt kilometer of each node includes the exchange megawatt public affairs of equivalent generating node and equivalent load node In.
Tracking module 430, for obtain the head end branch road that is connected with equivalent load node and with equivalent generating node phase End branch even, by Tracing power flow device according to head end branch road, traces into the generating that power is provided for equivalent load node Node, by Tracing power flow device according to end branch, traces into the load bus for receiving equivalent generating node power output.
In order to improve the reasonability and accuracy of transmission of electricity wheeling rates, it is necessary to consider DC line, accordingly it is desirable to find out with The connected circuit of DC line head end, that is, find out the head end branch road being connected with equivalent load node, by adverse current tracking, with Which generating node is track trace into for equivalent load node power output to generating node, and need to find out and DC line end The connected circuit in end, that is, find out the end branch being connected with equivalent generating node, by following current tracking, traces into load section Point, that is, trace into equivalent generating node for which load bus provides power.
Direct current megawatt kilometer acquisition module 440, for the length of DC line to be shared to each generating node for tracing into And each load bus for tracing into, obtain power network in each node direct current length contributory value, according in power network each node it is straight Stream length contributory value, calculates the direct current megawatt kilometer of each node in power network.
The length of DC line is shared to each generating node for tracing into and each load bus for tracing into, due to Track to generating node and load bus may have multiple, so as to need the length by DC line share to trace into each Generating node and each load bus for tracing into.The length of every DC line is shared the length of each node in power network It is added, can obtain the direct current length contributory value of each node in power network, according to the direct current length contributory value of each node in power network, calculates The direct current megawatt kilometer of each node in power network, specifically, unit million is multiplied by by length is shared according to the direct current of each node in power network Power, calculates the direct current megawatt kilometer of each node in power network.
That is, the length of DC line to be given each generating node for tracing into and each load bus for tracing into Undertake, for example, the length of DC line is 100, if the amortization ratio to generating and load is set as 2 in advance：3, then by direct current The length 100 of circuit gives each load bus for tracing into each generating node and tracing into according to the amortization ratio respectively, i.e., directly In the length 100 of Flow Line 40 share and are undertaken to each generating node for tracing into, and remaining 60 is shared to each load for tracing into Node undertakes, that is, the direct current megawatt kilometer of each generating node for tracing into is then for 40 are multiplied by the power of unit million, and what is traced into is each negative The direct current megawatt kilometer of lotus node is then for 60 are multiplied by the power of unit million.Specifically, the length of every DC line is shared into section The direct current megawatt kilometer of point is added, and the direct current megawatt kilometer of node is can obtain, for example, above-mentioned direct current megawatt kilometer is 40 tracking The generating node for arriving is also relevant with another DC line, i.e., also for the equivalent load node of another DC line provides work( Rate, now, another length of DC line is 50, and it is 20 to share to the length of the generating node for tracing into, then have two The length of DC line has shares the above-mentioned generating node for tracing into, the direct current megawatt kilometer of the above-mentioned generating node for tracing into Share the direct current megawatt kilometer sum of the generating node for tracing into for the length of two DC lines.
The length of DC line is shared to each generating node for tracing into and each load section for tracing into by above-mentioned The direct current that point step can obtain each generating node for tracing into shares length and the direct current of each load bus for tracing into is shared Length, because generating node and load bus are the divisions of each node in power network, i.e., each node is to include generating node in power network And load bus, the direct current of each generating node that acquisition is traced into shares length and the direct current of each load bus for tracing into divides Stand length, is that the direct current for obtaining each generating node for tracing into and each load bus for tracing into each node of power network is shared Length, the load bus not traced into power network and the generating node not traced into are equivalently employed without sharing DC line Length, is equivalently employed without direct current megawatt kilometer so that, the direct current for knowing each generating node for tracing into share length and with Track to each load bus direct current share length after, you can know that the direct current of each node in power network shares length.S150：Will be each The exchange megawatt kilometer of node is added with the direct current megawatt kilometer of each node, total megawatt of kilometer of each node is obtained, according to each section Total megawatt of kilometer of point, obtains each region megawatt kilometer.
Total megawatt of kilometer of each node for obtaining is to consider exchange megawatt kilometer it is contemplated that direct current megawatt kilometer, according to Total megawatt of kilometer of each node, each region megawatt kilometer of acquisition is more rationally and accurate, so that, transmission of electricity wheeling rates can be improved and determined Reasonability and accuracy.
Transmission of electricity wheeling rates computing module 460, for obtaining predetermined system enlarging coefficient and the preset security factor, according to pre- If system enlarging coefficient, the preset security factor and each region megawatt kilometer, each region transmission of electricity wheeling rates are calculated.
Predetermined system enlarging coefficient reflects the expense of unit length Typical Route, and the preset security factor reflects system to safety The cost of the system redundancy capacity that the requirement of nargin is caused, will each region megawatt kilometer carry out linear transformation to obtain each region defeated Electric wheeling rates, specifically, region transmission of electricity wheeling rates are that region megawatt kilometer, predetermined system enlarging coefficient and the preset security factor multiply Product.Total megawatt of kilometer of the node obtained by said process is the direct current megawatt kilometer and the sum for exchanging megawatt kilometer of node, The region megawatt kilometer obtained by total megawatt of kilometer of node equivalent to have also contemplated that direct current and exchange, then according to each region million It is more accurate and reasonable that watt kilometer obtains each region transmission of electricity wheeling rates.Each power generation region of power network and each load area are according to transmission of electricity Wheeling rates reclaim power cost, then, it is determined that after each region transmission of electricity wheeling rates, then the economic benefit in each region is also true therewith Fixed, each region transmission of electricity wheeling rates are more reasonable and accurate, and the economic benefit ratio in each region is more reasonable, and generating and user both sides are Preferable economic benefit can be obtained.
Planning module 470, for obtaining newly-increased node, according to the transmission of electricity of each region wheeling rates and newly-increased node, planning electricity The network line structure of net.
After the transmission of electricity wheeling rates to each region determine, when there is newly-increased node to need to be added in power network, in order to ensure The economic benefit of newly-increased node and the reasonability of power network, electricity is added to by according to each region transmission of electricity wheeling rates by newly-increased node Realize making rational planning for power network in net.
The network line structural planning device of above-mentioned power network, according to the power variation and network line of each network line Length, obtain power network in each node exchange megawatt kilometer, the length of DC line is shared to each generating section for tracing into Point and each load bus for tracing into, obtain the direct current length contributory value of each node, and the direct current length according to each node is shared Value, calculates the direct current megawatt kilometer of each node in power network, by each node in the exchange megawatt kilometer of each node in power network and power network Direct current megawatt kilometer be added, obtain total megawatt of kilometer of each node in power network, total megawatt of kilometer of such node is what is considered Exchange megawatt kilometer it is contemplated that direct current megawatt kilometer so that, each region that the total megawatt of kilometer subsequently according to node is calculated is defeated Electric wheeling rates are more reasonable, then, further according to each region transmission of electricity wheeling rates, newly-increased node are added in power network, to plan power network Network line structure, be according to each region transmit electricity wheeling rates, newly-increased node is planned into power network, to update the defeated of power network The structure of electric line, can so be conducive to planning in newly-increased node and which region due to each region transmission of electricity wheeling rates rationally Node is connected to ensure newly-increased node economic benefit, so that, newly-increased node is reasonably planned to power network.
Wherein in one embodiment, direct current megawatt kilometer acquisition module 440 includes：
Share than acquisition module, for obtaining default generate electricity and load shares ratio；
Distribution coefficient acquisition module, for obtained by Tracing power flow device each head end branch road power partition coefficient and The power partition coefficient of each end branch；
Share length acquisition module, for according to the default power distribution for sharing ratio, each head end branch road generated electricity with load The power partition coefficient of coefficient and each end branch, the length of DC line is shared to each generating node for tracing into and Each load bus for tracing into, obtains the direct current length contributory value of each node in power network；
Direct current megawatt kilometer computing module, for the direct current of each node in power network to be shared into length with the power phase of unit million Multiply, obtain the direct current megawatt kilometer of each node in power network.
When the power that multiple nodes are provided is received, it according to power partition coefficient is receiving power that each node is to node Node provide power, which node can be traced for equivalent load node provides power and can obtain by Power Flow Tracing Method The power partition coefficient of connected head end branch road is obtained, the power partition coefficient of branch road is the power of branch road to node injection The power distribution factor of the sensitivity coefficient of power, i.e. node on this branch road, just may know that minor node injecting power in the node On distribution power.According to power partition coefficient, by the length of DC line share to each generating node for tracing into and with Each load bus that track is arrived, and obtain the direct current megawatt kilometer of each node.For example, the length of DC line is 100, presets and generate electricity With sharing than being 2 for load：3, it is 40 that the length of DC line is shared to the length of each generating node for tracing into, share to The length of each load bus that track is arrived is 60.Allocation proportion of the power of DC line on head end branch road is head end branch road Power partition coefficient, if the quantity of head end branch road is 2, and two power partition coefficients relative to DC line of head end branch road 0.5 is, is connection generating node and equivalent load section because head end branch road is node that power is provided for equivalent load node Point, so that, head end branch road shares length for 0.5 is multiplied by 40, similarly, if the quantity of the end branch for obtaining is 2, its power point Distribution coefficient is respectively 0.4 and 0.6, then the length that end branch is shared is respectively 0.4 and is multiplied by 60 and 0.6 and is multiplied by 60.Then The direct current of each node in power network is shared into length to be multiplied with the power of unit million, the direct current megawatt kilometer of each node in power network is obtained.
Wherein in one embodiment, region megawatt kilometer acquisition module 450 includes：
Total megawatt of kilometer acquisition module, for respectively by each node in the exchange megawatt kilometer of each node in power network and power network Direct current megawatt kilometer be added, obtain power network in each node total megawatt of kilometer；
Region megawatt kilometer computing module, the power for obtaining each individual node in each node in power network accounts for individual node The power proportions of region interior nodes general power, according to total million of each node in the power proportions and power network of each individual node Watt kilometer, obtains each region megawatt kilometer respectively.
In the present embodiment, megawatt kilometer is the change of every increase unit megawatt power network totle drilling cost, that is to say, that be cost Variable, region megawatt kilometer is that the total megawatt of weighted sum of kilometer of each node in region is average, wherein, total megawatt of kilometer of node Weight be the power of node, that is to say, that in a region, region megawatt kilometer is by total megawatt of public affairs of regional nodes In be multiplied by weight and sue for peace after divided by weight sum.Region megawatt kilometer be multiplied by predetermined system spreading coefficient and preset security because Son can obtain region transmission of electricity wheeling rates.
Fig. 5, Shi Lizhong are referred to, region includes power generation region and load area, and each region transmission of electricity wheeling rates include each Power generation region transmission of electricity wheeling rates and each load area transmission of electricity wheeling rates；
The network line structural planning device of above-mentioned power network also includes：
Subregion is always transmitted electricity wheeling rates computing module 561, for according to each power generation region interior nodes general power and each hair Electric region transmission of electricity wheeling rates, calculate total transmission of electricity wheeling rates of power generation region, according to each load area interior nodes general power and respectively Load area transmission of electricity wheeling rates, total transmission of electricity wheeling rates in calculated load region.
That is, power generation region may have multiple, the transmission of electricity wheeling rates of each power generation region and each power generation region interior nodes The general power sum of products calculates total transmission of electricity wheeling rates of power generation region, and load area may have multiple, the transmission of electricity of each load area Total transmission of electricity wheeling rates in wheeling rates and each load area interior nodes general power sum of products calculated load region.
Correcting module 562, for always being transmitted electricity the ratio of wheeling rates when total transmission of electricity wheeling rates occupied area domain of load area When preset ratio, modifying factor is set, according to modifying factor to total transmission of electricity wheeling rates of power generation region and load area Total transmission of electricity wheeling rates are modified respectively, wherein, region always transmit electricity total transmission of electricity wheeling rates that wheeling rates are load area with generate electricity Total transmission of electricity wheeling rates sum in region.
When total transmission of electricity wheeling rates occupied area domain of load area always transmit electricity the ratio of wheeling rates be not equal to preset ratio when, that is, bear Total transmission of electricity wheeling rates in lotus region and total transmission of electricity wheeling rates of power generation region are unsatisfactory for the benefit ratio for generating electricity and load is obtained, Need to be modified it.
Correction value computing module 563, revised area is accounted for for the total transmission of electricity wheeling rates according to revised load area Domain is always transmitted electricity the ratio condition equal with preset ratio of wheeling rates, calculates the value of modifying factor.
By introducing modifying factor, and it is total to account for revised region according to total transmission of electricity wheeling rates of revised load area Transmit electricity the ratio condition equal with preset ratio of wheeling rates, calculate the value of modifying factor, that is to say, that according to the amendment of acquisition It is full after the value of the factor is modified respectively to the total transmission of electricity wheeling rates and total transmission of electricity wheeling rates of load area to power generation region The benefit ratio that foot is generated electricity and load is obtained.
Wheeling rates correcting module 564, for the value according to modifying factor, transmitted electricity to power generation region wheeling rates and loading zone Domain transmission of electricity wheeling rates are modified respectively, obtain revised power generation region transmission of electricity wheeling rates and load area was transmitted electricity net Take.
After the value for obtaining modifying factor, according to the value of modifying factor, transmitted electricity to power generation region wheeling rates and loading zone Domain transmission of electricity wheeling rates are modified respectively, obtain revised power generation region transmission of electricity wheeling rates and revised load area is defeated Electric wheeling rates, so that the amendment to wheeling rates of transmitting electricity is realized, so that each region transmission of electricity wheeling rates are more rationally and accurate.
Wherein in one embodiment, an exchange megawatt kilometer acquisition module 420 includes：
Power acquisition module, the initial power for obtaining each network line, obtaining the power of power network interior joint increases single Position megawatt hour, the target power of each network line；
Variable quantity acquisition module, for initial power and target power according to each network line, obtains each grid line The power variation on road；
Conversion module, for the default conversion factor according to each network line, the length to each network line is carried out respectively Conversion, obtains the datum length of each network line；
Exchange megawatt kilometer computing module, for by the datum length phase of the power variation of network line and network line Multiply, obtain the exchange megawatt kilometer variable quantity of each network line, the exchange megawatt kilometer variable quantity summation to each network line is obtained Obtain the exchange megawatt kilometer of each node in power network.
Before exchange megawatt kilometer variable quantity is calculated, the certain type of network line of certain voltage class is selected first Used as benchmark, its length is constant, and the length of other kinds of networking circuit is multiplied by default conversion factor and obtains datum length, with true The length for protecting whole network circuit more meets reality, so that, the region transmission of electricity wheeling rates for calculating are more rationally accurate.For example, can On the basis of selected 400 kilovolts networking circuit, the default conversion factor of 275 kilovolts of networking circuit is 1.74,132 kilovolts of net The default conversion factor on winding thread road is 2.61.
Each technical characteristic of above example can be combined arbitrarily, to make description succinct, not to above-described embodiment In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics do not exist lance Shield, is all considered to be the scope of this specification record.
Above example only expresses several embodiments of the invention, and its description is more specific and in detail, but can not be because This and be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, not On the premise of departing from present inventive concept, various modifications and improvements can be made, these belong to protection scope of the present invention.Cause This, the protection domain of patent of the present invention should be determined by the appended claims.

Claims (10)

1. a kind of network line structural planning method of power network, it is characterised in that comprise the following steps：
The length of the DC line and the network line in electricity grid network circuit is obtained, and by the both sides of the DC line Middle rectification side is equivalent to load bus, obtains equivalent load node, and inverter side in the both sides of the DC line is equivalent into hair Electrical nodes, obtain equivalent generating node；
The power for obtaining each node in the initial power and the power network of each network line increases each institute of unit megawatt hour The target power of network line is stated, according to the initial power and the target power of each network line, obtains each The power variation of the network line, the power variation and the network line according to each network line Length, obtain power network in each node exchange megawatt kilometer, wherein, in power network each node include load bus and Generating node；
The head end branch road being connected with the equivalent load node and the end branch being connected with the equivalent generating node are obtained, By Power Flow Tracing Method according to the head end branch road, the generating node that power is provided for the equivalent load node is traced into, By the Power Flow Tracing Method according to the end branch, the load for receiving the equivalent generating node power output is traced into Node；
The length of the DC line is shared to each generating node for tracing into and each load bus for tracing into, electricity is obtained The direct current length contributory value of each node in net, according to the direct current length contributory value of each node in power network, calculates power network In each node direct current megawatt kilometer；
The direct current megawatt kilometer of the exchange megawatt kilometer node each with power network of each node in power network is added respectively, Total megawatt of kilometer of each node in power network is obtained, according to total megawatt of kilometer of each node in power network, each region is obtained Megawatt kilometer；
Predetermined system enlarging coefficient and the preset security factor are obtained, coefficient, the default peace are extended according to the predetermined system Total divisor and each region megawatt kilometer, calculate each region transmission of electricity wheeling rates；
Newly-increased node is obtained, according to each region transmission of electricity wheeling rates and the newly-increased node, the network of the power network is planned Line construction.
2. the network line structural planning method of power network according to claim 1, it is characterised in that described by the direct current The length of circuit is shared to each generating node for tracing into and each load bus for tracing into, and obtains each node in power network Direct current length contributory value, according to the direct current length contributory value of each node in power network, calculate each node in power network The step of direct current megawatt kilometer, includes：
The default generating of acquisition shares ratio with load；
The power partition coefficient and each end branch of each head end branch road are obtained by the Power Flow Tracing Method Power partition coefficient；
Ratio, the power partition coefficient of each head end branch road and each end are shared with load according to the default generating The power partition coefficient of branch road, by the length of the DC line share to each generating node for tracing into and trace into it is each Load bus, obtains the direct current length contributory value of each node in power network；
The direct current length contributory value of each node in power network is multiplied with unit megawatts of power, it is each described in acquisition power network The direct current megawatt kilometer of node.
3. the network line structural planning method of power network according to claim 1, it is characterised in that described respectively by power network In the direct current megawatt kilometer of the exchange megawatt kilometer node each with power network of each node be added, obtain each institute in power network Total megawatt of kilometer of node is stated, according to total megawatt of kilometer of each node in power network, the step of obtain each region megawatt kilometer Including：
The direct current megawatt kilometer of the exchange megawatt kilometer node each with power network of each node in power network is added respectively, Obtain total megawatt of kilometer of each node in power network；
The power of each individual node accounts for the individual node region interior nodes general power in each node in acquisition power network Power proportions, according to total megawatt of kilometer of each node in the power proportions and power network of each individual node, respectively Obtain each region megawatt kilometer.
4. the network line structural planning method of power network according to claim 3, it is characterised in that the region includes hair Electric region and load area, each region transmission of electricity wheeling rates include each power generation region transmission of electricity wheeling rates and each load area Transmission of electricity wheeling rates；
It is described to obtain newly-increased node, according to each region transmission of electricity wheeling rates and the newly-increased node, plan the power network Before the step of network line structure, also include：
According to each power generation region interior nodes general power and each power generation region transmission of electricity wheeling rates, the generating area is calculated Total transmission of electricity wheeling rates in domain, according to each load area interior nodes general power and each load area transmission of electricity wheeling rates, Calculate total transmission of electricity wheeling rates of the load area；
When total transmission of electricity wheeling rates occupied area domain of the load area always transmit electricity the ratio of wheeling rates be not equal to preset ratio when, set Modifying factor, the total transmission of electricity wheeling rates to the power generation region and total transmission of electricity of the load area according to the modifying factor Wheeling rates are modified respectively, wherein, the region is always transmitted electricity the total transmission of electricity wheeling rates and institute that wheeling rates are the load area State total transmission of electricity wheeling rates sum of power generation region；
Total transmission of electricity wheeling rates according to the revised load area account for the revised region and always transmit electricity the ratio of wheeling rates The example condition equal with the preset ratio, calculates the value of the modifying factor；
According to the value of the modifying factor, net that each power generation region transmission of electricity wheeling rates and each load area were transmitted electricity Expense is modified respectively, obtains revised each power generation region transmission of electricity wheeling rates and each load area was transmitted electricity net Take.
5. the network line structural planning method of power network according to claim 1, it is characterised in that the acquisition is each described The power of each node increases the mesh of each network line of unit megawatt hour in the initial power of network line and the power network Mark power, according to the initial power and the target power of each network line, obtains each network line Power variation, the length of the power variation and the network line according to each network line obtains power network In each node exchange megawatt kilometer the step of include：
The initial power of each network line is obtained, the power of individual node in each node in the power network is obtained respectively Increase unit megawatt hour, the target power of each network line；
According to the initial power and the target power of each network line, the power of each network line is obtained Variable quantity；
According to the default conversion factor of each network line, the length to each network line is converted respectively, is obtained The datum length of each network line；
The power variation of the network line is multiplied with the datum length of the network line, each network is obtained The exchange megawatt kilometer variable quantity of circuit, the exchange megawatt kilometer variable quantity summation to each network line, in acquisition power network The exchange megawatt kilometer of each node.
6. the network line structural planning device of a kind of power network, it is characterised in that including：
Equivalent modules, the length for obtaining the DC line in electricity grid network circuit and the network line, and will be described Rectification side is equivalent to load bus in the both sides of DC line, equivalent load node is obtained, by the both sides of the DC line Inverter side is equivalent to generating node, obtains equivalent generating node；
Exchange megawatt kilometer acquisition module, for each node in the initial power and the power network that obtain each network line Power increase each network line of unit megawatt hour target power, according to the initial power of each network line And the target power, the power variation of each network line is obtained, according to the power of each network line The length of variable quantity and the network line, obtains the exchange megawatt kilometer of each node in power network, wherein, it is each in power network The node includes load bus and generating node；
Tracking module, for obtain the head end branch road that is connected with the equivalent load node and with the equivalent generating node phase End branch even, by Power Flow Tracing Method according to the head end branch road, traces into as the equivalent load node provides work( The generating node of rate, by the Power Flow Tracing Method according to the end branch, traces into the reception equivalent generating node The load bus of power output；
Direct current megawatt kilometer acquisition module, for the length of the DC line to be shared to each generating node for tracing into and Each load bus for tracing into, obtains the direct current length contributory value of each node in power network, according to each node in power network Direct current length contributory value, calculate power network in each node direct current megawatt kilometer；
Region megawatt kilometer acquisition module, for respectively by each institute in the exchange megawatt kilometer of each node in power network and power network The direct current megawatt kilometer for stating node is added, and total megawatt of kilometer of each node in power network is obtained, according to each section in power network Total megawatt of kilometer of point, obtains each region megawatt kilometer；
Transmission of electricity wheeling rates computing module, for obtaining predetermined system enlarging coefficient and the preset security factor, according to described default System enlarging coefficient, the preset security factor and each region megawatt kilometer, calculate each region transmission of electricity wheeling rates；
Planning module, for obtaining newly-increased node, according to each region transmission of electricity wheeling rates and the newly-increased node, plans institute State the network line structure of power network.
7. the network line structural planning device of power network according to claim 6, it is characterised in that the direct current megawatt public affairs In acquisition module include：
Share than acquisition module, for obtaining default generate electricity and load shares ratio；
Distribution coefficient acquisition module, the power partition coefficient for obtaining each head end branch road by the Tracing power flow device And the power partition coefficient of each end branch；
Share length acquisition module, for the power for sharing ratio, each head end branch road according to the default generating and load The power partition coefficient of distribution coefficient and each end branch, shares to what is traced into each by the length of the DC line Generating node and each load bus for tracing into, obtain the direct current length contributory value of each node in power network；
Direct current megawatt kilometer computing module, for by the direct current length contributory value of each node in power network and unit megawatt Power is multiplied, and obtains the direct current megawatt kilometer of each node in power network.
8. the network line structural planning device of power network according to claim 6, it is characterised in that the region megawatt public affairs In acquisition module include：
Total megawatt of kilometer acquisition module, for respectively will be each described in the exchange megawatt kilometer of each node in power network and power network The direct current megawatt kilometer of node is added, and obtains total megawatt of kilometer of each node in power network；
Region megawatt kilometer computing module, the power for obtaining each individual node in each node in power network accounts for described single The power proportions of node region interior nodes general power, according to each institute in the power proportions and power network of each individual node Total megawatt of kilometer of node is stated, each region megawatt kilometer is obtained respectively.
9. the network line structural planning device of power network according to claim 8, it is characterised in that the region includes hair Electric region and load area, each region transmission of electricity wheeling rates include each power generation region transmission of electricity wheeling rates and each load area Transmission of electricity wheeling rates；
The network line structural planning device of above-mentioned power network also includes：
Subregion is always transmitted electricity wheeling rates computing module, for according to each power generation region interior nodes general power and each hair Electric region transmission of electricity wheeling rates, calculate total transmission of electricity wheeling rates of the power generation region, according to each load area interior nodes total work Rate and each load area transmission of electricity wheeling rates, calculate total transmission of electricity wheeling rates of the load area；
Correcting module, for when total transmission of electricity wheeling rates occupied area domain of the load area always transmit electricity wheeling rates ratio be not equal to it is pre- If during ratio, setting modifying factor, according to the modifying factor to total transmission of electricity wheeling rates of the power generation region and described negative Total transmission of electricity wheeling rates in lotus region are modified respectively, wherein, region wheeling rates of always transmitting electricity are the total of the load area Transmission of electricity wheeling rates and the power generation region total transmission of electricity wheeling rates sum；
Correction value computing module, the revised area is accounted for for the total transmission of electricity wheeling rates according to the revised load area Domain is always transmitted electricity the ratio condition equal with the preset ratio of wheeling rates, calculates the value of the modifying factor；
Wheeling rates correcting module, for the value according to the modifying factor, to each power generation region transmission of electricity wheeling rates and respectively Load area transmission of electricity wheeling rates are modified respectively, obtain revised each power generation region transmission of electricity wheeling rates and each The load area transmission of electricity wheeling rates.
10. the network line structural planning device of power network according to claim 6, it is characterised in that the exchange megawatt Kilometer acquisition module includes：
Power acquisition module, the initial power for obtaining each network line respectively is obtained and respectively saved described in the power network The power of individual node increases unit megawatt hour, the target power of each network line in point；
Variable quantity acquisition module, for the initial power and the target power according to each network line, obtains The power variation of each network line；
Conversion module, for the default conversion factor according to each network line, respectively to the length of each network line Converted, obtained the datum length of each network line；
Exchange megawatt kilometer computing module, for by the base of the power variation of the network line and the network line Standard length is multiplied, and obtains the exchange megawatt kilometer variable quantity of each network line, the exchange megawatt to each network line Kilometer variable quantity summation, obtains the exchange megawatt kilometer of each node in power network.
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