CN110323787A - A kind of Tie line Power iterative optimization method - Google Patents
A kind of Tie line Power iterative optimization method Download PDFInfo
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Abstract
The present invention relates to network optimization technical field more particularly to a kind of Tie line Power iterative optimization methods.Tie line Power iterative optimization method proposed by the present invention, which is specifically included that, exchanges power and short-term load forecasting result with security constraint, initial contact line according to unit generation cost, using the cost of electricity-generating for minimizing each regional power grid as target, optimizes and obtain the power output arrangement of each regional power grid；To reduce two regional power grid total power production costs as target, update is iterated to each scheduling slot Tie line Power based on the real-time marginal generating cost of regional power grid；Repeat previous step, until can not realize that total power production cost reduces by Tie line Power between updating two regional power grids, day part Tie line Power and unit output arrangement after just obtaining iteration optimization.This method leads to too small amount of data communication and significantly reduces the total power production cost of two regional power grids, avoids a large amount of data transmission, protects data-privacy.
Description
Technical field
The present invention relates to network optimization technical field more particularly to a kind of Tie line Power iterative optimization methods.
Background technique
Currently, the development of China's extra-high voltage grid construction is maked rapid progress, extra-high voltage alternating current-direct current transmission line of electricity quantity is not yet
It is disconnected to increase, it will to form the control alternating current-direct current extra-high voltage regional power grid that region span is growing, electrical link is even closer.It is logical
Multi-region electric network interconnection is crossed, carries out transregional transaction, is conducive to resource distributing rationally in network-wide basis, improves whole economy
Property and safety.Unit Combination is to be gone out according to the parameter of the various constraint conditions of system and generating set to formulate reasonable unit
Power scheme realizes that total power production cost is minimum.But under existing scheduling method, Unit Combination is only capable of mostly to regional power grid
Internal generation assets optimize, and fail the resource optimization for considering network-wide basis.Therefore, in regional power grid Unit Combination result
On the basis of, Tie line Power optimization is the key link that trans-regional most optimum distribution of resources is realized under existing operation plan mode
One of, it is a kind of effective means for improving efficiency of energy utilization.Obviously, money of the Tie line Power optimization for electric system
There is great role for the configuration of source, however the prior art or lack and power grid is actual contacts or to the overall situation of system
Optimization considers deficiency, has certain limitation.
Summary of the invention
The object of the present invention is to provide a kind of Tie line Power iterative optimization methods, and it is inline to give full play to regional power grid
The function of winding thread is minimized the whole network total power production cost.
For achieving the above object, the present invention provides a kind of Tie line Power iterative optimization method, it is applied to
Two regional power grids of interconnection, comprising:
S1. power and short-term load forecasting are exchanged with security constraint, initial contact line according to unit generation cost as a result, with
The cost of electricity-generating for minimizing each regional power grid is target, and optimization obtains the initial unit output arrangement of two regional power grids；
S2. initial total power production cost is calculated；
S3. to reduce total power production cost as target, by update each two regional power grids of scheduling slot power output arrangement and
Tie line Power is iterated optimization, then calculates total power production cost；
S4. the total power production cost that step S3 is calculated is compared with the initial total power production cost, if being lower than institute
Initial total power production cost is stated, then replaces the initial total power production cost with the total power production cost that step S3 is calculated, returns to step
Rapid S3, otherwise stops iteration, export under current state Tie line Power of two regional power grids in each scheduling slot and
Corresponding unit output arrangement.
Preferably, to reduce total power production cost as target, by updating each two regional power grids of scheduling slot in step S3
Power output arrangement and Tie line Power be iterated optimization and refer to as steps described below to t-th of scheduling slot, two regions
The power output arrangement of power grid and Tie line Power are updated, wherein t=1,2 ..., T, T are preset scheduling slot number:
S31. marginal generating cost of two regional power grids in t-th of scheduling slot is calculated separately, is specifically included: being calculated
The marginal generating cost of every generating set of two regional power grids in t-th of scheduling slot out selects the current scheduling period
That highest generating set of interior marginal generating cost is as the marginal unit in corresponding region power grid, then the regional power grid is
Marginal generating cost in t scheduling slot is the marginal generating cost of the marginal unit；
S32. according to the marginal generating cost of t-th of scheduling slot, two regional power grids, preset Tie line Power
Update step-length judge whether to meet update condition, if meeting the update condition, t-th of scheduling slot marginal generating cost compared with
The marginal unit generation power of high regional power grid updates step-length by the Tie line Power and lowers, t-th of scheduling slot
The marginal unit generation power of the lower regional power grid of marginal generating cost updates step-length up-regulation by the Tie line Power,
The Tie line Power of t-th of scheduling slot updates step-length by the Tie line Power and makees corresponding update；If discontented
The foot update condition, the Tie line Power and corresponding unit output peace of two regional power grids in t-th of scheduling slot
It arranges constant；
Wherein, the update condition is shown below:
In above formula, ρG,tFor the marginal generating cost of the higher regional power grid of marginal generating cost in t-th of scheduling slot；
ρF,tThe marginal generating cost of the lower regional power grid of marginal generating cost in t-th of scheduling slot；ρLBetween two regional power grids
Interconnection electrical energy transportation price；PL,tFor the Tie line Power of t-th of scheduling slot；PSFunction is exchanged for preset interconnection
Rate updates step-length；PL,maxFor the regional power grid interconnection transmission power limit；For t-th of scheduling slot marginal generating cost
The marginal unit k of higher regional power gridGGenerated output；For t-th of lower area of scheduling slot marginal generating cost
The marginal unit k of domain power gridFGenerated output；For the higher regional power grid limit of t-th of scheduling slot marginal generating cost
Unit kGMinimum load；For the lower regional power grid limit unit k of t-th of scheduling slot marginal generating costFMaximum
Power output.
Compared with prior art, the present invention provides a kind of Tie line Power iterative optimization method.Firstly, according to unit
Cost of electricity-generating exchanges power and short-term load forecasting as a result, each regional power grid carries out machine respectively with security constraint, initial contact line
Group combination optimizes using the cost of electricity-generating for minimizing each regional power grid as target and obtains the initial unit output peace of each regional power grid
Row.Then, on the basis of Unit Combination result, according to the real-time marginal cost of each regional power grid and marginal unit maximum/minimum
Interconnection electrical energy transportation price, the interconnection transmission power limit and the exchange of default interconnection between power output technological constraint, regional power grid
Power updates step-length, changes unit output arrangement of two regional power grids in each scheduling slot by the period, by updating two
Tie line Power of the regional power grid in each scheduling slot optimizes unit of two regional power grids in each scheduling slot and goes out
Power arrangement obtains optimization tie-line power transmission of two regional power grids in each scheduling slot and optimization unit output arrangement,
This target of the whole network cost of electricity-generating is reduced to reach.The above process is repeated, until can not be by updating two region electricity
Tie line Power realizes that total power production cost reduces between net, and the total power production cost of two regional power grids has reached optimal.This
When, the Tie line Power of two regional power grids is optimal Tie line Power.In this method interconnection region power grid it
Between only need a small amount of data communication, avoid the transmission of a large amount of data, protect data-privacy, and hand over by updating interconnection
Power is changed, the total power production cost of two regional power grids is significantly reduced.
Specific embodiment
Below with reference to the embodiment of the present invention, technical scheme in the embodiment of the invention is clearly and completely described, shows
So, described embodiments are only a part of the embodiments of the present invention, rather than whole embodiments.Based on the implementation in the present invention
Example, every other embodiment obtained by those of ordinary skill in the art without making creative efforts belong to
The scope of protection of the invention.
The embodiment of the invention provides a kind of Tie line Power iterative optimization method, this method is applied to the two of interconnection
A regional power grid, specifically includes:
S1: with security constraint, initial contact line exchanging power and short-term load forecasting according to unit generation cost as a result, with
The cost of electricity-generating for minimizing each regional power grid is target, and optimization obtains the initial unit output arrangement of two regional power grids；
Two regional power grids are denoted as regional power grid 1 and regional power grid 2 respectively, it is specified that two regional power grids are in each scheduling
The Tie line Power positive direction of section flows to regional power grid 1 from regional power grid 2 for active power.According to unit generation cost with
Security constraint, initial contact line exchange power and short-term load forecasting are as a result, respectively with the hair of regional power grid 1 and regional power grid 2
Electric cost minimization turns to target, and optimization obtains the initial unit output arrangement of regional power grid 1 and regional power grid 2；
S2. initial total power production cost is calculated；
Initial total hair is calculated according to the cost of electricity-generating that initial contact line exchanges power, regional power grid 1 and regional power grid 2
Electric cost.
S3. to reduce total power production cost as target, by the interconnection for updating each scheduling slot between two regional power grids
The power output arrangement of exchange power and two each scheduling slots of regional power grid is iterated optimization, then calculates total power production cost；
To reduce total power production cost as target, the interconnection by updating each scheduling slot between two regional power grids is exchanged
The power output arrangement of power and two each scheduling slots of regional power grid is iterated optimization, specifically includes the following steps:
Firstly, unit output arrangement of two regional power grids solved according to step S1 in each scheduling slot, by the period
Calculate separately the marginal generating cost of regional power grid 1 and regional power grid 2, specific formula for calculation are as follows:
ρi,t=2ai,kPi,k,t+bi,k (1)
In above formula, ρi,tFor marginal generating cost of the regional power grid i in t-th of scheduling slot, wherein i is regional power grid
Index, i=1,2；T is scheduling slot index, and entire scheduling interval is made of T scheduling slot, t=1,2,3, T；
ai,kAnd bi,kThe electric power generation cost data of the marginal unit k of respectively regional power grid i, wherein k is each regional power grid in each scheduling
Marginal machine group index in section, each regional power grid are made of K platform unit, k=1, and 2,3, K；Pi,k,tFor regional power grid i
The generated output of marginal unit k in t-th of scheduling slot.Wherein, limit hair of the regional power grid i in t-th of scheduling slot
Electric cost is the maximum value of regional power grid marginal generating cost of all booting units within the current scheduling period, then corresponding
Unit is marginal unit of the regional power grid i in t-th of scheduling slot.As the iteration of Tie line Power updates, each area
Marginal unit of the domain power grid within the current scheduling period may change, i.e., side of each regional power grid in each scheduling slot
Border machine group index k may change.
Then, step-length, interconnection electrical energy transportation price, interconnection are updated by preset Tie line Power and conveys function
Rate limit restraint and marginal unit maximum/minimum power output technological constraint, by period update area power grid 1,2 in each scheduling slot
Tie line Power, specifically the exchange power as steps described below to interconnection in t-th of scheduling slot is updated,
Wherein, t=1,2 ..., T, T are preset scheduling slot number:
(1) in t-th of scheduling slot, if ρ1,t> ρ2,t, illustrate that the marginal generating cost of regional power grid 1 is larger, G 1,
The marginal generating cost of regional power grid 2 is smaller, F 2, and when meeting the constraint condition as shown in formula (2) simultaneously, must update current
The power output arrangement of the marginal unit of Tie line Power and regional power grid 1,2 in scheduling slot.
In above formula, ρL,tFor interconnection electrical energy transportation price, unit: $/MW；PL,tIt is interconnection in t-th of scheduling slot
Exchange power, unit: MW；PSStep-length, unit: MW are updated for preset Tie line Power；PL,maxFor interconnection conveying
Power limit, unit: MW；P1,k1,t、P2,k2,tThe respectively marginal unit output value in t-th of scheduling slot of regional power grid 1,2,
Unit: MW；For the minimum load of the marginal unit in t-th of scheduling slot of regional power grid 1, unit: MW；For region
The maximum output of the marginal unit in t-th of scheduling slot of power grid 2, unit: MW.Wherein, k1、k2Respectively regional power grid 1,2 exists
Marginal machine group index in t-th of scheduling slot.If above-mentioned constraint condition all meets, illustrate in t-th of scheduling
The difference of the marginal generating cost of two regional power grids is greater than interconnection conveying price in section, and meets interconnection transmission power pole
Limit constraint and marginal unit maximum/minimum power output technological constraint.At this point, can update as the following formula in the area current scheduling period Nei Liangge
The power generating value of Tie line Power and marginal unit between the power grid of domain:
The current scheduling period, after the marginal generating cost of regional power grid 1 subtracts the marginal generating cost of regional power grid 2,
Difference is greater than dominant eigenvalues and conveys price.Due to regulation two regional power grids each scheduling slot Tie line Power just
Direction flows to regional power grid 1 from regional power grid 2 for active power, and Tie line Power increases PS, corresponding, regional power grid 1
Marginal unit output value lower PS, the marginal unit output value up-regulation P of regional power grid 2S。
(2) in t-th of scheduling slot, if ρ1,t< ρ2,t, illustrate that the marginal generating cost of regional power grid 1 is smaller, F 1,
The marginal generating cost of regional power grid 2 is larger, G 2, and when meeting the constraint condition as shown in formula (4) simultaneously, must update current adjust
The power output arrangement of the Tie line Power and the marginal unit of regional power grid 1,2 in the period is spent, specifically more new formula such as formula (5) institute
Show.
In above formula, ρL,tFor interconnection electrical energy transportation price, unit: $/MW；PL,tIt is interconnection in t-th of scheduling slot
Exchange power, unit: MW；PSStep-length, unit: MW are updated for preset Tie line Power；PL,maxFor interconnection conveying
Power limit, unit: MW；P1,k1,t、P2,k2,tThe respectively marginal unit output value in t-th of scheduling slot of regional power grid 1,2,
Unit: MW；For the maximum output of the marginal unit in t-th of scheduling slot of regional power grid 1, unit: MW；For region
The maximum output of the marginal unit in t-th of scheduling slot of power grid 2, unit: MW.Wherein, k1、k2Respectively regional power grid 1,2 exists
Marginal machine group index in t-th of scheduling slot.If above-mentioned constraint condition all meets, illustrate in t-th of scheduling
The difference of the marginal generating cost of two regional power grids is greater than interconnection conveying price in section, and meets interconnection transmission power pole
Limit constraint and marginal unit maximum/minimum power output technological constraint.At this point, can update as the following formula in the area current scheduling period Nei Liangge
The power generating value of Tie line Power and marginal unit between the power grid of domain:
The current scheduling period, after the marginal generating cost of regional power grid 2 subtracts the marginal generating cost of regional power grid 1,
Difference is greater than dominant eigenvalues and conveys price.Due to regulation two regional power grids each scheduling slot Tie line Power just
Direction flows to regional power grid 1 from regional power grid 2 for active power, and Tie line Power reduces PS, corresponding, regional power grid 1
Marginal unit output value raise PS, the marginal unit output value downward P of regional power grid 2S。
(3) in t-th of scheduling slot, if being unsatisfactory for formula (2) or formula (4) described condition, when keeping current scheduling
The Tie line Power of two regional power grids and marginal unit output are constant in section.
After the completion of all scheduling time Tie line Powers all update, updated total power production cost is calculated, then will
Updated total power production cost is compared with the initial total power production cost, if being lower than the initial total power production cost, is used
The total power production cost that step S3 is calculated replaces the initial total power production cost, otherwise return step S3 stops iteration, exports
Tie line Power and corresponding unit output arrangement of two regional power grids in each scheduling slot under current state.
S4. the total power production cost that step S3 is calculated is compared with the initial total power production cost, if being lower than institute
Initial total power production cost is stated, then replaces the initial total power production cost with the total power production cost that step S3 is calculated, returns to step
Rapid S3, otherwise stops iteration, export under current state Tie line Power of two regional power grids in each scheduling slot and
Corresponding unit output arrangement.
The Tie line Power initial value of regional power grid 1,2 is that the interconnection that interconnection long term power exchange plan gives is handed over
Power is changed, from the initial value, method as described above, on the basis of initial Unit Combination result, only according to each region
The power output bound, interregional interconnection electrical energy transportation price of marginal unit, interconnection are defeated in real time for real-time marginal cost, each region
It send power limit and default interconnection to update step-length, changes unit output of two regional power grids in each scheduling slot by the period
It arranges, by updating two regional power grids Tie line Power in each scheduling slot, optimizes two regional power grids in each tune
The unit output arrangement in the period is spent, optimization tie-line power transmission of two regional power grids in each scheduling slot and excellent is obtained
Change unit output arrangement, so that reaching reduces this target of the whole network cost of electricity-generating.The above process is repeated, until two regions
Between Tie line Power can not update, the total power production cost of two regional power grids has reached optimal.At this point, two region electricity
The Tie line Power of net is optimal Tie line Power.
Technical solution provided in an embodiment of the present invention is described in detail below with reference to practical application scene, firstly, defeated
Enter the electric power generation cost data of unit, technical parameter, short-term load forecasting data and interconnection initial exchange in a dispatching cycle
Power, each regional power grid carry out Unit Combination respectively；Then, interconnection electrical energy transportation price, Tie line Power are inputted more
New step-length, interconnection transmission power limiting value.2 regional power grids are shared in the present embodiment, each regional power grid there are 10 power generations
Unit, for design parameter as shown in table 1, table 2, load prediction data is shown in Table 3.
It should be noted that in the present embodiment dispatching cycle be one day, a scheduling slot length is 1 hour, one
Share 24 scheduling slots a dispatching cycle.
1 regional power grid of table, 1 generator 's parameter
2 regional power grid of table, 2 generator 's parameter
3 load prediction data of table
Arrangement, load are planned and contributed to the initial unit booting of regional power grid 1,2 respectively as shown in table 4, table 5, in addition, two
Interconnection parameter between a regional power grid is shown in Table 6.
The initial unit output arrangement of 4 regional power grid of table 1
The initial unit output arrangement of 5 regional power grid of table 2
6 interconnection parameter of table
The computer hardware environment for executing optimization is Intel (R) Core (TM) i5-8265U, dominant frequency 1.60GHz, memory
For 8GB；Software environment is 10 operating system of Windows.It is emulated using above data, region is set forth in table 7, table 8
The optimal unit output arrangement of power grid 1,2 can be seen that two regional power grid operations can fully meet entire scheduling week from table 7-8
Workload demand in phase, and do not occur abandoning power levels.
The optimal unit output arrangement of 7 regional power grid of table 1
The optimal unit output arrangement of 8 regional power grid of table 2
As shown in Table 7, regional power grid 1 increases 60MW in the unit gross capability of scheduling slot 1,2, scheduling slot 3,
8, unit gross capability reduces 10MW in 15-19.According to shown in table 8, unit gross capability of the regional power grid 2 in scheduling slot 1,2
Reduce 60MW, unit gross capability increases 10MW in scheduling slot 3,8,15-19, illustrates real-time based on regional power grid
Marginal generating cost is iterated update to Tie line Power, can give full play to the tie-line power transmission between regional power grid
Effect.
The optimal Tie line Power of table 9
Table 9 gives optimal Tie line Power and conveying cost, intuitively illustrates the region in each scheduling slot
The flow direction of the exchange power of 1,2 interconnection of power grid, in scheduling slot 1,2, active power is flowed by interconnection from regional power grid 1
To regional power grid 2, value is 60MW.In 3,8 and 15-19 of scheduling slot, active power is flowed by interconnection from regional power grid 2
To regional power grid 1, value is 10MW.
Total power production cost compares after table 10 gives regional power grid 1,2 initial total power production costs and optimizes.As it can be seen that initial complete
Net total generation cost is 1297017.8 $, and optimal the whole network total generation cost after optimization is 1272200.8 $, cost decline 24817
$, economic benefit obviously get a promotion.
The comparison of 10 performance driving economy of table
The above results are analyzed it is found that the present invention is by optimization Tie line Power, while coordinating and optimizing each regional power grid
Interior generation schedule is of great significance to reducing the whole network total power production cost, improving performance driving economy.
A kind of Tie line Power optimization method provided herein is described in detail above, it is described above
It is merely used to help understand the present processes and its core concept.It should be pointed out that for corresponding those of ordinary skill in the art,
Under the premise of not departing from the application principle, can also to the application, some improvement and modification can also be carried out, these improvement and modification
It falls into the protection scope of the claim of this application.
Each embodiment is described in a progressive manner in specification, the highlights of each of the examples are with other realities
The difference of example is applied, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
Speech, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is referring to method part illustration
?.
Claims (2)
1. a kind of Tie line Power iterative optimization method, two regional power grids applied to interconnection, which is characterized in that described
Iterative optimization method includes:
S1. power and short-term load forecasting are exchanged as a result, with minimum with security constraint, initial contact line according to unit generation cost
The cost of electricity-generating for changing each regional power grid is target, and optimization obtains the initial unit output arrangement of two regional power grids；
S2. initial total power production cost is calculated；
S3. to reduce total power production cost as target, by the power output arrangement and contact that update each two regional power grids of scheduling slot
Line exchange power is iterated optimization, then calculates total power production cost；
S4. the total power production cost that step S3 is calculated is compared with the initial total power production cost, if first lower than described
Beginning total power production cost, then the total power production cost replacement initial total power production cost being calculated with step S3, return step S3,
Otherwise stop iteration, export unit output arrangement in each scheduling slot of two regional power grids under current state and corresponding
Winding thread exchanges power.
2. a kind of Tie line Power iterative optimization method according to claim 1, which is characterized in that in step S3 with
Reduction total power production cost is target, by the power output arrangement and Tie line Power that update each two regional power grids of scheduling slot
It is iterated optimization and refers to the power output arrangement to t-th of scheduling slot, two regional power grids as steps described below and interconnection exchange
Power is updated, wherein t=1,2 ..., T, T are preset scheduling slot number:
S31. marginal generating cost of two regional power grids in t-th of scheduling slot is calculated separately, specifically includes: calculating two
The marginal generating cost of every generating set of a regional power grid in t-th of scheduling slot selects current scheduling period inner edge
Cost of electricity-generating that highest generating set in border is as the marginal unit in corresponding region power grid, then the regional power grid is at t-th
Marginal generating cost in scheduling slot is the marginal generating cost of the marginal unit；
S32. it is updated according to the marginal generating cost of t-th of scheduling slot, two regional power grids, preset Tie line Power
Step-length judges whether to meet update condition, if meeting the update condition, t-th of scheduling slot marginal generating cost is higher
The marginal unit generation power of regional power grid updates step-length by the Tie line Power and lowers, t-th of scheduling slot limit
The marginal unit generation power of the lower regional power grid of cost of electricity-generating updates step-length up-regulation, t by the Tie line Power
The Tie line Power of a scheduling slot updates step-length by the Tie line Power and makees corresponding update；If being unsatisfactory for institute
State update condition, the Tie line Power of two regional power grids and corresponding unit output arrange not in t-th of scheduling slot
Become；
Wherein, the update condition is shown below:
In above formula, ρG,tFor the marginal generating cost of the higher regional power grid of marginal generating cost in t-th of scheduling slot；ρF,tThe
The marginal generating cost of the lower regional power grid of marginal generating cost in t scheduling slot；ρLIt is got in touch between two regional power grids
Line electrical energy transportation price；PL,tFor the Tie line Power of t-th of scheduling slot；PSMore for preset Tie line Power
New step-length；PL,maxFor the regional power grid interconnection transmission power limit；It is higher for t-th of scheduling slot marginal generating cost
Regional power grid marginal unit kGGenerated output；For the lower region electricity of t-th of scheduling slot marginal generating cost
The marginal unit k of netFGenerated output；For the higher regional power grid limit unit of t-th of scheduling slot marginal generating cost
kGMinimum load；For the lower regional power grid limit unit k of t-th of scheduling slot marginal generating costFMaximum go out
Power.
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Application publication date: 20191011 Assignee: NANTONG ZHONGNENG MACHINERY Co.,Ltd. Assignor: NANTONG University Contract record no.: X2022980024936 Denomination of invention: An iterative optimization method for tie line exchange power Granted publication date: 20210924 License type: Common License Record date: 20221209 |