CN106099923B - Transmission line of electricity optimization method and device - Google Patents
Transmission line of electricity optimization method and device Download PDFInfo
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- CN106099923B CN106099923B CN201610602336.4A CN201610602336A CN106099923B CN 106099923 B CN106099923 B CN 106099923B CN 201610602336 A CN201610602336 A CN 201610602336A CN 106099923 B CN106099923 B CN 106099923B
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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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/06—Electricity, gas or water supply
Abstract
The present invention relates to a kind of transmission line of electricity optimization method and device, the method obtains the related data of the power transmission network in each region, system enlarging coefficient and factor of safety；The full-length of DC line is added in each alternating current circuit according to nodal information and line information, alternating current circuit length after being processed；Equivalent process is carried out to DC line；Using trend comparison method, the first change of power flow of each circuit of the power transmission network after equivalent process is calculated；Basic megawatt of kilometer of the corresponding node of circuit is obtained according to alternating current circuit length after the first change of power flow and treatment；The basic megawatt of kilometer according to each node obtains region limit megawatt kilometer；Coefficient, factor of safety and region limit a megawatt kilometer are extended according to system and is calculated Transmission Cost；Transmission line of electricity is optimized according to Transmission Cost.By the adjustable optimization circuit of Transmission Cost, the network structure of power network is planned again, make the rationally distributed of transmission line of electricity, so as to reduce Transmission Cost.
Description
Technical field
The present invention relates to grid power transmission technical field, more particularly to a kind of transmission line of electricity optimization method and device.
Background technology
Transmission Pricing is the key link in electricity market, is also the vital task of China's current power market reform.State
Family State Development and Reform Commission person meeting, National Energy Board print and distribute《Implementation guideline on propulsion T-D tariff reform》Explicitly point out, build
The independent T-D tariff system that legislate is then apparent, level reasonable, supervision is strong, science is transparent, formation guarantee electric power netting safe running,
Meet the Power Transmission Pricing Mechanisms of electricity market needs.The power system reform of a new round, general thought be " keep a grip on centre,
Decontrol two ", the propulsion marketization.As can be seen here, under new power market reform background, rational Transmission Pricing method is studied
It is particularly important.
Transmission Pricing is relevant with the Transmission Cost of electric power, and the Transmission Cost of electric power is largely determined by transmission line of electricity
It is fixed, therefore, rational transmission line of electricity will influence Transmission Pricing.When transmission line of electricity is unreasonable, Transmission Cost can be caused to increase,
Transmission Pricing increases therewith.
The content of the invention
Based on this, it is necessary to provide a kind of transmission line of electricity optimization method and device for reducing Transmission Cost.
A kind of transmission line of electricity optimization method, including：
Obtain related data, system enlarging coefficient and the factor of safety of the power transmission network in each region；The related data packets
Include nodal information and line information；The line information includes the full-length of DC line and the full-length of alternating current circuit；
The full-length of DC line is added to the mark of each alternating current circuit according to the nodal information and the line information
In standard length, alternating current circuit length after being processed；
Equivalent process is carried out to the DC line, the equivalent process includes：Rectification side in DC line is equivalent
It is load bus, the inverter side in DC line is equivalent to generating node；
Using trend comparison method, the first change of power flow of each circuit of the power transmission network after equivalent process is calculated；
The base of the corresponding node of circuit is obtained according to alternating current circuit length after first change of power flow and the treatment
This megawatt of kilometer；
The basic megawatt of kilometer according to each node is calculated region limit megawatt kilometer；
Coefficient, factor of safety and region limit a megawatt kilometer are extended according to the system and is calculated Transmission Cost；
Transmission line of electricity is optimized according to the Transmission Cost.
In one embodiment, the nodal information includes node power, described according to the nodal information and the line
Be added to the full-length of DC line in the full-length of each alternating current circuit by road information, alternating current circuit length after being processed
Step, including：
The work(that the equivalent current component for calculating each node injecting power according to the node power causes on each circuit
Rate is distributed；
The full-length of DC line is added in the full-length of each alternating current circuit according to the power distribution.
In one embodiment, the use trend comparison method, is calculated each line of the power transmission network after equivalent process
The step of first change of power flow on road, includes：
The first Load flow calculation value that Load flow calculation obtains each circuit is carried out to the power transmission network after equivalent process；
Remove the power of generating node in the power transmission network after the equivalent process and the load of load and load bus
And generated output, and re-start the second Load flow calculation value that Load flow calculation obtains each circuit；
The difference of the first Load flow calculation value and the second Load flow calculation value is calculated, first change of power flow is
The difference of the first Load flow calculation value and the second Load flow calculation value.
In one embodiment, the basic megawatt of kilometer according to each node is calculated region limit megawatt kilometer
Step includes：
Each node to the power transmission network after equivalent process increases the load or generated output of predetermined amount, using trend ratio
Compared with method, the second change of power flow is calculated；
The new of the corresponding node of circuit is obtained according to alternating current circuit length after second change of power flow and the treatment
Megawatt kilometer；
The marginal megawatt kilometer of node is obtained according to the new megawatt kilometer and the basic megawatt of kilometer；
The weighted average of the marginal megawatt kilometer of all nodes in zoning, the region limit megawatt kilometer is area
The weighted average calculated according to node load peak value or generating EIAJ of the marginal megawatt kilometer of all nodes in domain.
In one embodiment, the Transmission Cost includes power generation region Transmission Cost and load area Transmission Cost；
Transmission Cost is calculated according to system enlarging coefficient, factor of safety and a region limit megawatt kilometer described
The step of after, also include：
Whether within a preset range to judge the ratio of the power generation region Transmission Cost and load area Transmission Cost；
If it is not, then calculating modifying factor according to the power generation region Transmission Cost and the load area Transmission Cost；
Power generation region Transmission Cost and the load area Transmission Cost according to the modifying factor amendment.
A kind of transmission line of electricity optimizes device, including：
Data acquisition module, the related data of the power transmission network for obtaining each region, system enlarging coefficient and it is safe because
Number；The related data includes nodal information and line information；The line information includes full-length and the friendship of DC line
The full-length of Flow Line；
Line processing module, for being added the full-length of DC line according to the nodal information and the line information
To in the full-length of each alternating current circuit, alternating current circuit length after being processed；
Equivalent process module, for carrying out equivalent process to the DC line, the equivalent process includes：By AC line
Rectification side in road is equivalent to load bus, and the inverter side in DC line is equivalent into generating node；
Load flow calculation module, for using trend comparison method, calculates the of each circuit of the power transmission network after equivalent process
One change of power flow；
Node computing module, for obtaining line according to alternating current circuit length after first change of power flow and the treatment
Basic megawatt of kilometer of the corresponding node in road；
Area calculation module, for being calculated region limit megawatt kilometer according to basic megawatt of kilometer of each node；
Cost calculation module, calculates for extending coefficient, factor of safety and region limit megawatt kilometer according to the system
Obtain Transmission Cost；
Optimization module, for optimizing transmission line of electricity according to the Transmission Cost.
In one embodiment, the nodal information includes node power, and the line processing module includes：
Power computation module, the equivalent current component for calculating each node injecting power according to the node power exists
The power distribution caused on each circuit；
DC line processing module, for the full-length of DC line to be added into each AC line according to the power distribution
In the full-length on road.
In one embodiment, the first Load flow calculation module, for carrying out tide to the power transmission network after equivalent process
Stream calculation obtains the first Load flow calculation value of each circuit；It is additionally operable to remove in the power transmission network after the equivalent process node that generates electricity
Power and load and load bus load and generated output, and re-start Load flow calculation obtain each circuit second tide
Stream calculation value；And calculate the difference of the first Load flow calculation value and the second Load flow calculation value, first power flow changing
It is the difference of the first Load flow calculation value and the second Load flow calculation value to measure.
In one embodiment, the area calculation module includes：
Second Load flow calculation module, the load of predetermined amount is increased for each node to the power transmission network after equivalent process
Or generated output, using trend comparison method, it is calculated the second change of power flow；
Node megawatt kilometer computing module, for long according to alternating current circuit after second change of power flow and the treatment
Degree obtains the new megawatt kilometer of the corresponding node of circuit；
Marginal megawatt kilometer computing module, for being saved according to the new megawatt kilometer and the basic megawatt of kilometer
The marginal megawatt kilometer of point；
Weighted average calculation module, for the weighted average of the marginal megawatt kilometer of all nodes in zoning, institute
State the maximum according to node load peak value or generating of the marginal megawatt kilometer that region limit megawatt kilometer is all nodes in region
The weighted average of output calculation.
In one embodiment, the Transmission Cost includes power generation region Transmission Cost and load area Transmission Cost；
Described device also includes：Judge module, modifying factor computing module and correcting module；
The judge module, for judge the power generation region Transmission Cost and load area Transmission Cost ratio whether
Within a preset range；
The modifying factor computing module, for when the judged result of the judge module is no, according to the generating
Region Transmission Cost and the load area Transmission Cost calculate modifying factor；
The correcting module, power generation region Transmission Cost and the load area are defeated according to the modifying factor amendment
Electric cost.
Above-mentioned transmission line of electricity optimization method, equivalent process is carried out by DC line, and the standard of DC line is long
Degree is added in the full-length of alternating current circuit, has taken into full account that China has the situation of a plurality of HVDC transmission line.Due to
The Transmission Cost of meter and DC power transmission line, Transmission Cost is more accurate because obtained from.Again by Transmission Cost to power transmission line
Road is optimized, and the network structure of power network is planned again, makes the rationally distributed of transmission line of electricity, so as to reduce Transmission Cost.
Brief description of the drawings
Fig. 1 is the flow chart of the transmission line of electricity optimization method of one embodiment；
Fig. 2 is the flow chart of the transmission line of electricity optimization method of another embodiment；
Fig. 3 optimizes the high-level schematic functional block diagram of device for the transmission line of electricity of one embodiment.
Specific embodiment
In order that the purpose of the present invention, technical scheme and advantage become more apparent, below in conjunction with drawings and Examples,
The present invention will be described in further detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention,
Do not limit the present invention.
A kind of transmission line of electricity optimization method, is applied to terminal device, as shown in figure 1, comprising the following steps：
S102：Obtain related data, system enlarging coefficient and the factor of safety of the power transmission network in each region.
Related data includes nodal information and line information；Line information includes the full-length and AC line of DC line
The full-length on road.
In a particular embodiment, the above-mentioned related data in advance to power transmission network is organized into Excel file, and subregion
Domain is marked.Region in the present embodiment is province, in other embodiments, it is also possible to be marked by region of city/county.Directly
The full-length of Flow Line and the full-length of alternating current circuit are converted by previously according to circuit conversion factor to each circuit
Obtain.
System enlarging coefficient reflects the expense of unit length Typical Route, and factor of safety reflection system is wanted to margin of safety
Seek the cost of the system redundancy capacity for causing.The mode of the related data of the power transmission network in each region is obtained specifically, importing
Data in Excel file.System extends coefficient and factor of safety by user input, or can be organized in Excel file, passes through
The mode of system introducing Excel file is obtained.
S104：It is long according to the standard that the full-length of DC line is added to each alternating current circuit by nodal information and line information
In degree, alternating current circuit length after being processed.
The electric network composition of China is complicated, there is a plurality of HVDC transmission line.In the present embodiment, it is contemplated that China's power network
The characteristic of structure, the full-length of DC line is added to the full-length of each alternating current circuit according to nodal information and line information
In, alternating current circuit length after being processed.
S106：Equivalent process is carried out to DC line.
Equivalent process includes：Rectification side in DC line is equivalent to load bus, by the inverter side in DC line
It is equivalent to generating node.
In the present embodiment, the DC line of the power transmission network in each region is found out, equivalent process is carried out by DC line,
The factor of the DC line in power transmission network temporarily can not be considered.
S108：Using trend comparison method, the first change of power flow of each circuit of the power transmission network after equivalent process is calculated.
Trend comparison method, particularly carries out Load flow calculation twice to the power transmission network after equivalent process, and the first trend becomes
Change amount is the difference of Load flow calculation twice.
S110：Basic the million of the corresponding node of circuit is obtained according to alternating current circuit length after the first change of power flow and treatment
Watt kilometer.
Specifically, basic megawatt of kilometer of the corresponding node of circuit be the first change of power flow and treatment after alternating current circuit it is long
The product of degree.
S112：The basic megawatt of kilometer according to each node is calculated region limit megawatt kilometer.
Specifically, megawatt kilometer according to each node calculates total megawatt kilometer, further according to the nodal information in each region, ask
Obtain the marginal megawatt kilometer in region.
S114：Coefficient, factor of safety and region limit a megawatt kilometer are extended according to system and is calculated Transmission Cost.
It should be appreciated that the Transmission Cost in the present embodiment is the cost related to position.
Specifically, under the computing formula of Transmission Cost is：
TG,J=mZone,G,j×E×S；
TD,k=mZone,D,k×E×S；
Wherein, TG,JIt is the Transmission Cost of power generation region, mZone,G,j× it is the region limit megawatt kilometer of power generation region, TD,k
It is the Transmission Cost of load area, mZone,D,kIt is the region limit megawatt kilometer of load area, E is that system extends coefficient, and S is peace
Full factor.System enlarging coefficient reflects the expense of unit length Typical Route, and factor of safety reflection system is wanted to margin of safety
Seek the cost of the system redundancy capacity for causing.
S116：Transmission line of electricity is optimized according to Transmission Cost.
If the Transmission Cost for obtaining is too high, optimization circuit is can adjust, the network structure of power network is planned again, make transmission line of electricity
It is rationally distributed.
Above-mentioned transmission line of electricity optimization method, equivalent process is carried out by DC line, and the standard of DC line is long
Degree is added in the full-length of alternating current circuit, has taken into full account that China has the situation of a plurality of HVDC transmission line.Due to
The Transmission Cost of meter and DC power transmission line, Transmission Cost is more accurate because obtained from.Again by Transmission Cost to power transmission line
Road is optimized, and the network structure of power network is planned again, makes the rationally distributed of transmission line of electricity, so as to reduce Transmission Cost.
In another embodiment, nodal information includes node power.Step S102 comprises the following steps 1 and step 2：
Step 1：What the equivalent current component for calculating each node injecting power according to node power caused on each circuit
Power distribution.Specifically,
The formula for calculating equivalent Injection Current is：Wherein, I is participant in the market k the
The i equivalent Injection Current of the power of node, ViIt is i-th voltage of node,It is participant in the market k in i-th node
Active power,It is participant in the market k in i-th reactive power of node；
Calculating the formula of electric current that equivalent current causes on circuit mn is：Wherein,
Imn,iIt is the electric current that equivalent current causes on circuit mn, I is i-th equivalent Injection Current of node, ymnIt is leading for circuit mn
Receive, ZmiAnd ZniIt is respectively the mutual impedance of node m and node n to node i.
The formula of the power that calculate node i causes on circuit mn is：Wherein,For market is joined
With person k in node i to the power that causes on circuit mn, VmIt is the voltage of node m.
Step 2：The full-length of DC line is added in the full-length of each alternating current circuit according to power distribution.
In another embodiment, step S108 comprises the following steps 1 and step 2.
Step 1：The first Load flow calculation value that Load flow calculation obtains each circuit is carried out to the power transmission network after equivalent process.
Step 2：The power and load of generating node and bearing for load bus in power transmission network after removal equivalent process
Lotus and generated output, and re-start the second Load flow calculation value that Load flow calculation obtains each circuit.
Step 3：The difference of the first Load flow calculation value and the second Load flow calculation value is calculated, the first change of power flow is the first tide
The difference of stream calculation value and the second Load flow calculation value.
In another embodiment, step S114 comprises the following steps 1 to step 4.
Step 1：Each node to the power transmission network after equivalent process increases the load or generated output of predetermined amount, uses
Trend comparison method, is calculated the second change of power flow.
In one embodiment, each node i successively to the power transmission network after equivalent process increases the hair of 1MW (megawatt)
Electricity/load power；Increase 1MW and load/generated output in reference mode.
Using trend comparison method, the specific steps for being calculated the second change of power flow are identical with step 108, herein no longer
Repeat.
Step 2：The new of the corresponding node of circuit is obtained according to alternating current circuit length after the second change of power flow and treatment
Megawatt kilometer.
Step 3：The marginal megawatt kilometer of node is obtained according to new megawatt kilometer and basic megawatt of kilometer.
Specifically, the basic megawatt of kilometer according to each node calculates basic megawatt of total kilometer.Basic megawatt of total kilometer
For the trend difference of all branch roads is multiplied by corresponding line length sum.
CMWkm=∑ Fij×lij
Wherein, CMWkmIt is basic megawatt of total kilometer, FijIt is the first trend difference variable design, lijFor alternating current circuit is long after treatment
Degree.
New megawatt kilometer according to each node calculates total new megawatt kilometer,
C'MWkm=∑ Fij′×lij
Wherein, C'MWkmIt is total new megawatt kilometer, Fij' it is the second change of power flow.
Total new megawatt kilometer and the difference of basic megawatt of total kilometer are the limit megawatt kilometer m of node ii：
mi=C 'MWkm-CMWkm
Step 4：The weighted average of the marginal megawatt kilometer of all nodes in zoning, a region limit megawatt kilometer is
The weighted average calculated according to node load peak value or generating EIAJ of the marginal megawatt kilometer of all nodes in region.
In another embodiment, Transmission Cost includes power generation region Transmission Cost and load area Transmission Cost.
After step sl 14, as shown in Fig. 2 also including：
S1151：Whether within a preset range to judge the ratio of power generation region Transmission Cost and load area Transmission Cost.If
It is no, then perform step S1152.If so, then performing step S116.
S1152：Modifying factor is calculated according to power generation region Transmission Cost and load area Transmission Cost.
S1153：According to modifying factor amendment power generation region Transmission Cost and load area Transmission Cost.
Power generation region Transmission Cost and load area Transmission Cost are modified respectively according to modifying factor, it is specific public
Formula is：
Wherein, Transmission Cost is load area Transmission Cost and power generation region Transmission Cost sum.
According to revised load area Transmission Cost RCT,GAccount for revised Transmission Cost (RCT,G+RCT,D) ratio (p
=RCT,D/(RCT,D+RCT,G)) and generating and the condition shared than waiting of load, calculate the value of modifying factor C, RCT,DAfter amendment
Power generation region Transmission Cost,It is power generation region h interior nodes general powers, total power generation region is G, and total load area is
D, PG,iIt is the power of power generation region h interior joints i in total power generation region G,To be saved in power generation region h in total power generation region G
Point sum.It is load area m interior nodes general powers, PD,iIt is the work(of total load area D intermediate load region m interior joints i
Rate,It is total load area D intermediate load region m interior joints sum.
According to the value of modifying factor C, to power generation region Transmission Cost mZone,G,hAnd load area Transmission Cost mZone,G,m
It is modified respectively, obtains revised power generation region Transmission Cost T 'G,hAnd revised load area Transmission Cost 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
The power generation region Transmission Cost and revised load area Transmission Cost after modification just are obtained, that is, is obtained
Transmission Cost after modification just, is optimized further according to Transmission Cost after amendment to transmission line of electricity, and the network of power network is planned again
Structure, makes the rationally distributed of transmission line of electricity, so as to reduce Transmission Cost.
As shown in figure 3, a kind of transmission line of electricity optimization device, including
Data acquisition module 102, the related data of the power transmission network for obtaining each region, system enlarging coefficient and safety
Factor；Related data includes nodal information and line information；Line information includes full-length and the alternating current circuit of DC line
Full-length.
Line processing module 104, for being added to respectively the full-length of DC line according to nodal information and line information
In the full-length of alternating current circuit, alternating current circuit length after being processed.
Equivalent process module 106, for carrying out equivalent process to DC line, equivalent process includes：By in DC line
Rectification side be equivalent to load bus, the inverter side in DC line is equivalent to generating node.
Load flow calculation module 108, for using trend comparison method, calculates each circuit of the power transmission network after equivalent process
First change of power flow.
Node computing module 110, for obtaining circuit pair according to alternating current circuit length after the first change of power flow and treatment
Basic megawatt of kilometer of the node answered.
Area calculation module 112, for being calculated region limit megawatt kilometer according to basic megawatt of kilometer of each node.
Cost calculation module 114, calculates for extending coefficient, factor of safety and region limit a megawatt kilometer according to system
To Transmission Cost.
Optimization module 116, for optimizing transmission line of electricity according to Transmission Cost.
Above-mentioned transmission line of electricity optimization device, equivalent process is carried out by DC line, and the standard of DC line is long
Degree is added in the full-length of alternating current circuit, has taken into full account that China has the situation of a plurality of HVDC transmission line.Due to
The Transmission Cost of meter and DC power transmission line, Transmission Cost is more accurate because obtained from.Again by Transmission Cost to power transmission line
Road is optimized, and the network structure of power network is planned again, makes the rationally distributed of transmission line of electricity, so as to reduce Transmission Cost.
In another embodiment, nodal information includes node power, and line processing module includes：
Power computation module, for calculating the equivalent current component of each node injecting power according to node power in each line
The power distribution caused on road；
DC line processing module, for the full-length of DC line to be added into each alternating current circuit according to power distribution
In full-length.
In another embodiment, the first Load flow calculation module, for carrying out trend to the power transmission network after equivalent process
It is calculated the first Load flow calculation value of each circuit；It is additionally operable to remove the power of generating node in the power transmission network after equivalent process
With load and the load and generated output of load bus, and the second Load flow calculation that Load flow calculation obtains each circuit is re-started
Value；And the difference of the first Load flow calculation value of calculating and the second Load flow calculation value, the first change of power flow is the first Load flow calculation value
With the difference of the second Load flow calculation value.
In another embodiment, area calculation module includes：
Second Load flow calculation module, the load of predetermined amount is increased for each node to the power transmission network after equivalent process
Or generated output, using trend comparison method, it is calculated the second change of power flow.
Node megawatt kilometer computing module, for obtaining line according to alternating current circuit length after the second change of power flow and treatment
The new megawatt kilometer of the corresponding node in road.
Marginal megawatt kilometer computing module, the limit for obtaining node according to new megawatt kilometer and basic megawatt of kilometer
Megawatt kilometer.
Weighted average calculation module, for the weighted average of the marginal megawatt kilometer of all nodes in zoning, area
Domain limit megawatt kilometer is the marginal megawatt kilometer of all nodes in region according to node load peak value or generating EIAJ
The weighted average of calculating.
In another embodiment, Transmission Cost includes power generation region Transmission Cost and load area Transmission Cost.
Device also includes：Judge module, modifying factor computing module and correcting module.
Judge module, for judging the ratio of power generation region Transmission Cost and load area Transmission Cost whether in default model
In enclosing.
Modifying factor computing module, for when the judged result of judge module is no, according to power generation region Transmission Cost
Modifying factor is calculated with load area Transmission Cost.
Correcting module, according to modifying factor amendment power generation region Transmission Cost and load area Transmission Cost.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses several embodiments of the invention, and its description is more specific and detailed, but simultaneously
Can not therefore be construed as limiting the scope of the patent.It should be pointed out that coming for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of transmission line of electricity optimization method, including：
Obtain related data, system enlarging coefficient and the factor of safety of the power transmission network in each region；The related data includes section
Point information and line information；The line information includes the full-length of DC line and the full-length of alternating current circuit；
It is long according to the standard that the full-length of DC line is added to each alternating current circuit by the nodal information and the line information
In degree, alternating current circuit length after being processed；
Equivalent process is carried out to the DC line, the equivalent process includes：Rectification side in DC line is equivalent to bear
Lotus node, generating node is equivalent to by the inverter side in DC line；
Using trend comparison method, the first change of power flow of each circuit of the power transmission network after equivalent process is calculated；
Basic the million of the corresponding node of circuit is obtained according to alternating current circuit length after first change of power flow and the treatment
Watt kilometer；
The basic megawatt of kilometer according to each node is calculated region limit megawatt kilometer；
Coefficient, factor of safety and region limit a megawatt kilometer are extended according to the system and is calculated Transmission Cost；
Transmission line of electricity is optimized according to the Transmission Cost.
2. transmission line of electricity optimization method according to claim 1, it is characterised in that the nodal information includes node work(
Rate, the standard that the full-length of DC line is added to each alternating current circuit according to the nodal information and the line information
In length, after being processed the step of the length of alternating current circuit, including：
The power that the equivalent current component for calculating each node injecting power according to the node power causes on each circuit point
Cloth；
The full-length of DC line is added in the full-length of each alternating current circuit according to the power distribution.
3. transmission line of electricity optimization method according to claim 1, it is characterised in that the use trend comparison method, calculates
The step of first change of power flow of each circuit for obtaining the power transmission network after equivalent process, includes：
The first Load flow calculation value that Load flow calculation obtains each circuit is carried out to the power transmission network after equivalent process；
Remove the power and load of generating node in the power transmission network after the equivalent process and the load and hair of load bus
Electrical power, and re-start the second Load flow calculation value that Load flow calculation obtains each circuit；
The difference of the first Load flow calculation value and the second Load flow calculation value is calculated, first change of power flow is described
The difference of the first Load flow calculation value and the second Load flow calculation value.
4. transmission line of electricity optimization method according to claim 1, it is characterised in that basic megawatt according to each node
The step of kilometer is calculated region limit megawatt kilometer includes：
Each node to the power transmission network after equivalent process increases the load or generated output of predetermined amount, is compared using trend
Method, is calculated the second change of power flow；
New million of the corresponding node of circuit are obtained according to alternating current circuit length after second change of power flow and the treatment
Watt kilometer；
The marginal megawatt kilometer of node is obtained according to the new megawatt kilometer and the basic megawatt of kilometer；
The weighted average of the marginal megawatt kilometer of all nodes in zoning, the region limit megawatt kilometer is in region
The weighted average calculated according to node load peak value or generating EIAJ of the marginal megawatt kilometer of all nodes.
5. transmission line of electricity optimization method according to claim 1, it is characterised in that the Transmission Cost includes power generation region
Transmission Cost and load area Transmission Cost；
The step that coefficient, factor of safety and region limit megawatt kilometer are calculated Transmission Cost is extended according to the system described
After rapid, also include：
Whether within a preset range to judge the ratio of the power generation region Transmission Cost and load area Transmission Cost；
If it is not, then calculating modifying factor according to the power generation region Transmission Cost and the load area Transmission Cost；
Power generation region Transmission Cost and the load area Transmission Cost according to the modifying factor amendment.
6. a kind of transmission line of electricity optimizes device, including：
Data acquisition module, the related data of the power transmission network for obtaining each region, system enlarging coefficient and factor of safety；Institute
Stating related data includes nodal information and line information；The line information includes full-length and the alternating current circuit of DC line
Full-length；
Line processing module, for being added to respectively the full-length of DC line according to the nodal information and the line information
In the full-length of alternating current circuit, alternating current circuit length after being processed；
Equivalent process module, for carrying out equivalent process to the DC line, the equivalent process includes：By in DC line
Rectification side be equivalent to load bus, the inverter side in DC line is equivalent to generating node；
Load flow calculation module, for using trend comparison method, calculates the first tide of each circuit of the power transmission network after equivalent process
Stream variable quantity；
Node computing module, for obtaining circuit pair according to alternating current circuit length after first change of power flow and the treatment
Basic megawatt of kilometer of the node answered；
Area calculation module, for being calculated region limit megawatt kilometer according to basic megawatt of kilometer of each node；
Cost calculation module, is calculated for extending coefficient, factor of safety and region limit a megawatt kilometer according to the system
Transmission Cost；
Optimization module, for optimizing transmission line of electricity according to the Transmission Cost.
7. transmission line of electricity according to claim 6 optimizes device, it is characterised in that the nodal information includes node work(
Rate, the line processing module includes：
Power computation module, for calculating the equivalent current component of each node injecting power according to the node power in each line
The power distribution caused on road；
DC line processing module, for the full-length of DC line to be added into each alternating current circuit according to the power distribution
In full-length.
8. transmission line of electricity according to claim 6 optimizes device, it is characterised in that the first Load flow calculation module, uses
Power transmission network after to equivalent process carries out the first Load flow calculation value that Load flow calculation obtains each circuit；It is additionally operable to removal described
The load and generated output of the power and load of generating node and load bus in power transmission network after equivalent process, and again
Carry out the second Load flow calculation value that Load flow calculation obtains each circuit；And calculate the first Load flow calculation value and second trend
The difference of calculated value, first change of power flow is the difference of the first Load flow calculation value and the second Load flow calculation value
Value.
9. transmission line of electricity according to claim 6 optimizes device, it is characterised in that the area calculation module includes：
Second Load flow calculation module, the load or hair of predetermined amount are increased for each node to the power transmission network after equivalent process
Electrical power, using trend comparison method, is calculated the second change of power flow；
Node megawatt kilometer computing module, for being obtained according to alternating current circuit length after second change of power flow and the treatment
To the new megawatt kilometer of the corresponding node of circuit；
Marginal megawatt kilometer computing module, for obtaining node according to the new megawatt kilometer and the basic megawatt of kilometer
Marginal megawatt kilometer；
Weighted average calculation module, for the weighted average of the marginal megawatt kilometer of all nodes in zoning, the area
Domain limit megawatt kilometer is the marginal megawatt kilometer of all nodes in region according to node load peak value or generating EIAJ
The weighted average of calculating.
10. transmission line of electricity according to claim 6 optimizes device, it is characterised in that the Transmission Cost includes generating area
Domain Transmission Cost and load area Transmission Cost；
Described device also includes：Judge module, modifying factor computing module and correcting module；
The judge module, for judging the ratio of the power generation region Transmission Cost and load area Transmission Cost whether pre-
If in scope；
The modifying factor computing module, for when the judged result of the judge module is no, according to the power generation region
Transmission Cost and the load area Transmission Cost calculate modifying factor；
The correcting module, power generation region Transmission Cost and the load area are transmitted electricity into according to the modifying factor amendment
This.
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