CN104598991B  Consider outer power transmission transaction, transprovincially transregional interconnection transaction and the Unit Combination acquisition methods of security constraint  Google Patents
Consider outer power transmission transaction, transprovincially transregional interconnection transaction and the Unit Combination acquisition methods of security constraint Download PDFInfo
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 CN104598991B CN104598991B CN201410835861.1A CN201410835861A CN104598991B CN 104598991 B CN104598991 B CN 104598991B CN 201410835861 A CN201410835861 A CN 201410835861A CN 104598991 B CN104598991 B CN 104598991B
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Abstract
Description
Technical field
The invention belongs to Utilities Electric Co.'s meter and the Unit Combination field of transaction composition and security constraint, more particularly to consider outer The formulation that power transmission is merchandised with the operation plan of transregional interconnection transaction transprovincially.
Background technology
From the point of view of electricity market reform situation in recent years, the regional power grid unified electricity market that country mainly carries out is built If during, due to the influence of many factors such as each province's level of economic development difference, electricity price level difference, electricity marketization changes Leather encounters bigger difficulty and resistance, and regional power grid unified electricity market is handling coordination of each side concerned's interests etc., Also various complicated sharp contradictions are faced with.Meanwhile to meet social economy's fast development needs, alleviate power supply contradiction, Short of electricity and nest electricity and the situation deposited effectively are solved, there is an urgent need for realize optimization of energy resources in China.With alternating currentdirect current Extrahigh voltage progressively puts into operation, and grid contact is increasingly close between major area and province, to realize that the most optimum distribution of resources in the whole country carries Solid hardware foundation is supplied.Therefore, between major area and province and inside the province trading program become realize that global resource is distributed rationally Key point.
Since modeling of the electricity transaction for resource is not limited in the physical characteristics such as unit, circuit, more often also need Embody the economic performances such as trade variety, trading rules.Therefore, under the target that global resource is distributed rationally, there is an urgent need for for not With the characteristic of electricity transaction composition, overall planning, studies the power generation dispatching towards transaction composition.In composition of merchandising, weigh here Point considers that outer power transmission transaction is distributed rationally with what transregional interconnection transprovincially was merchandised.
Unit Combination under Power Market is considered as Network Security Constraints has become a kind of common recognition.The transmission of electric power must Must be using electric power networks as support, and follow specific physics law, i.e., always along the path of impedance minimum.This that is, On electricity market, it is difficult to determine the relation between specific consumer and specific provider.The influence of network can also cause The problem of power trade of different directions mutually restricts.Therefore, Unit Combination only has the constraint of meter and electric power networks, could protect Optimal power trade is realized while the safe and reliable operation for demonstrate,proving power grid.
The content of the invention
It is an object of the invention to provide power transmission transaction, transprovincially transregional interconnection transaction and security constraint outside a kind of consideration Unit Combination acquisition methods.
To reach abovementioned purpose, present invention employs following technical scheme.
The first step, threedimensional is expanded to by the dimension of optimized variable unit output, wherein the first dimension is the time, the second dimension is machine Group power generating value, the third dimension are the trade varieties of the power of the assembling unit, and trade variety includes the transaction of outer power transmission, transprovincially transregional interconnection transaction Merchandise with basic electricity；
Second step, establishes Optimized model, the object function of Optimized model be system the transaction of outer power transmission with it is transregional transprovincially Winding thread transaction power purchase expense is minimum, and the constraints of Optimized model includes the constraint of unit gross capability, participates in the machine of outer power transmission transaction The unit of group transaction Constraint, the unit output constraint for being not involved in outer power transmission transaction, participation transregional interconnection transaction transprovincially is handed over Easy Constraint and the unit output constraint for being not involved in transregional interconnection transaction transprovincially；
3rd step, is solved to obtain each trade variety power generating value of unit during power purchase expense minimum to Optimized model.
The unit gross capability constraint representation is：
Wherein, Tra represents trade variety number；P_{i,t}Represent gross capability values of the unit i tth of period；P_{i},_{t,j}Table Show power generating values of the unit i in tth of period, jth of trade variety.
The unit transaction Constraint of the outer power transmission transaction of the participation is expressed as：
Wherein,Represent the outer power transmission trade contract charge value signed in contract time Tout；Tout represents outer power transmission The trade contract time；Iout represents to participate in the unit number of outer power transmission transaction；P_{i,t,out}Represent that unit i is handed over tth of period Easy kind is the power generating value of outer power transmission transaction；Δ t represents time segment length.
It is described be not involved in the transaction of outer power transmission unit output constraint representation be：
Wherein, i_{not}Represent to be not involved in the unit that outer power transmission is merchandised.
The unit transaction Constraint of the participation transregional interconnection transaction transprovincially is expressed as：
Wherein,Represent the interconnection trade contract charge value transregional transprovincially signed in contract time Tcont；Tcont Represent the transregional interconnection trade contract time transprovincially；Icont represents to participate in the unit number of transregional interconnection transaction transprovincially； P_{i,t,cont}Represent power generating values of the unit i in tth of period trade variety for transregional interconnection transaction transprovincially；Δ t represents the time Segment length.
It is described be not involved in transregional interconnection transaction transprovincially unit output constraint representation be：
Wherein, i_{not}Represent to be not involved in the unit of transregional interconnection transaction transprovincially.
The constraints of the Optimized model further includes the constraint of unit output bound, unit minimum continuous startstop time about Beam, the powerbalance constraint of system, the spare capacity of system constrain and the Transmission Capacity Constraints of circuit.
The object function is expressed as：
Wherein, F represents power transmission transaction and the power purchase expense of Utilities Electric Co. in transregional interconnection transaction transprovincially outside system；T Represent the time hop count in research cycle；Unit number in I expression systems；Δ t represents time segment length；Cost_{i,out}Expression machine During group i contributes, when trade variety is merchandised for outer power transmission, the power purchase expense of Utilities Electric Co.；Cost_{i,cont}In representing that unit i contributes, When trade variety is transregional interconnection transaction transprovincially, the power purchase expense of Utilities Electric Co.；P_{i,t,cont}Represent unit i tth of time Section trade variety is the power generating value of transregional interconnection transaction transprovincially；P_{i,t,out}Represent that unit i is in tth of period trade variety The power generating value of outer power transmission transaction, z_{i,t}=1 expression unit i is in open state, z tth of period_{i,t}=0 expression unit i exists Tth of period is in shutdown status.
Beneficial effects of the present invention are embodied in：
Classified in the present invention by transaction composition to unit output, by conventional twodimensional unit output Model Extension into threedimensional Unit output model, so as to introduce transaction compositional factors in Unit Combination, and establish on this basis consider outer power transmission merchandise, Transregional interconnection transaction transprovincially and the mathematical model of the Unit Combination of security constraint, with the transaction of outer power transmission and transregional contact transprovincially The minimum target of Utilities Electric Co.'s purchases strategies optimizes in line transaction, to consider that outer power transmission is counted with transregional interconnection transaction transprovincially Draw and the formulation of operation plan provides a strong guarantee, trade variety and rule can be embodied in electricity transaction is for the modeling of resource Then, the trading program and operation plan for realizing Utilities Electric Co. coordinate and optimize, and improve the science and validity of decisionmaking, adapt to concentrate The requirement that united market is runed after deployment.
Brief description of the drawings
Fig. 1 is conventional rack combined twodimension model；
Fig. 2 is the Unit Combination threedimensional model for considering transaction component；
Fig. 3 is the solution flow diagram of model；
Fig. 4 is grid wiring diagram, wherein：BUS represents busbar；
Fig. 5 is each moment output power diagram of unit 5；
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.
First, unit output dimension is expanded
How to realize that the identification of more transaction compositions and classification are that foundation considers outer power transmission transaction, transprovincially transregional interconnection is merchandised With the basis of the Optimization of Unit Commitment By Improved of security constraint.
As shown in Figure 1, the Unit Combination model of original consideration security constraint is two dimensional models, the unit in model goes out Power is and the relevant twodimentional continuous variable of time, unit.Particularly, each unit has in the time span that some sets One power output state；There is a power output state in each period of some unit in the time span of research.
When introducing multiexchange composition, the power that every unit is sent just is provided with trade variety attribute.Can be so Understand, if it is P that certain period of unit, which contributes, then m_{1}%^{*}The trade variety of P power is merchandised for basic electricity, m_{2}%^{*}P work( The trade variety of rate is merchandised for outer power transmission, m_{3}%^{*}The trade variety of P power is transregional interconnection transaction transprovincially.Wherein, Ge Gejiao Percentage summation shared by easy kind is 1, is expressed as m_{1}+m_{2}+m_{3}=100.Here, power transmission is merchandised, transprovincially except basic electricity refers to Transregional interconnection transaction and the electric power of special deal component, special deal component is Direct Purchase of Electric Energy by Large Users and Generation Rights Trade.
At this moment, consider that the Unit Combination model of transaction composition and security constraint should be changed into by two traditional dimensional models Three dimensionality model, the unit output in model are and time, unit, the relevant threedimensional continuous variable of transaction component.Particularly, Each unit has a power output state in the time span that some sets；Some unit is in the time span of research Each period have a power output state；Each unit is contributed in each period a trade variety attribute, As shown in Figure 2.
According to being analyzed in Fig. 2, it is P that unit is contributed in time t (1), then a part of power transaction composition is that outer power transmission is handed over Easily, a part of power transaction composition is transregional interconnection transaction transprovincially, some power transaction component is basic electricity transaction.
From the above mentioned, in the modeling for considering transaction component, power needs to carry out expanding dimension processing, by the two dimension of script Degree model extension becomes three dimensionality model.This is the modeling optimized integration for considering multiexchange composition.
The trade variety of unit output is merchandised by basic electricity, the transaction of outer power transmission and transregional interconnection transaction transprovincially are formed, Therefore unit gross capability is expressed as：
Wherein, Tra represents trade variety number；P_{i,t}Represent gross capability values of the unit i tth of period；P_{i,t,j}Expression machine Power generating values of the group i in tth of period, jth of trade variety.
2nd, meter and the mode that outer power transmission is merchandised in a model
Outer power transmission transaction refers mainly to the outer power transmission transaction of region class, power grid level Utilities Electric Co..This transaction is in some electric power Company electric power deficiency or since other reasons need to occur during other grid transmissions, this transaction is generally closer to the distance adjacent It is unfolded between Utilities Electric Co..Outer power transmission transaction has all embodied in the constraints of model and object function.Outer power transmission transaction Meter and mode in object function are shown in Part IV.
Meter and mode of the outer power transmission transaction in constraints are as follows：
It is negotiated to determine if predicted using annual contract trade mode, Utilities Electric Co. between net according to annual electrical demand Electricity price, signs purchase sale of electricity contract between year net.The unit transaction Constraint for so participating in outer power transmission transaction is expressed as：
Wherein,Represent the outer power transmission trade contract charge value signed in contract time Tout；Tout represents outer power transmission The trade contract time；Iout represents to participate in the unit number of outer power transmission transaction；P_{i,t,out}Represent that unit i merchandises tth of period Kind is the power generating value of outer power transmission transaction；Δ t represents time segment length.
And the unit output constraint representation for being not involved in sending outside electricity transaction is：
Wherein, i_{not}Represent to be not involved in the unit that outer power transmission is merchandised.
3rd, meter and the mode that transprovincially transregional interconnection is merchandised in a model
Interconnecting ties electricity transaction scale embodies the tightness degree that power grid connects each other from a side.Each subregion electricity Net often needs the exchange power on agreement interconnection, is carried out according to bilateral electricity contract for the consideration of security and economy Transaction.In addition, to ensure power demand of the power grid under normal and accident mode, there should be enough power branch between partition power grid Help ability.Electric Power Network Planning can strengthen interconnecting ties passage construction by optimizing electricity transaction scale between partition power grid, improve point Area's grid power transmission and support ability, make planning operation of power networks more flexible, are provided a strong guarantee for electricity transaction, maximum model Enclose and realize global resource energyconsuming.
Transprovincially transregional interconnection transaction has all embodied in the constraints of model and object function.Transregional contact transprovincially Meter and mode of the line transaction in object function are shown in Part IV.
Meter and mode of the transregional interconnection transaction transprovincially in constraints are as follows：
Each partition power grid often needs the exchange power on agreement interconnection for the consideration of security and economy, according to Bilateral electricity contract is traded.At this time, the unit transaction Constraint for participating in transregional interconnection transaction transprovincially is expressed as：
Wherein,Represent the interconnection trade contract charge value transregional transprovincially signed in contract time Tcont；Tcont Represent the transregional interconnection trade contract time transprovincially；Icont represents to participate in the unit number of transregional interconnection transaction transprovincially； P_{i,t,cont}Represent power generating values of the unit i in tth of period trade variety for transregional interconnection transaction transprovincially；Δ t represents the period Length.
And the unit output constraint representation for being not involved in transregional interconnection transaction transprovincially is：
Wherein, i_{not}Represent to be not involved in the unit of transregional interconnection transaction transprovincially.
4th, outer power transmission transaction, transprovincially transregional interconnection transaction and the Unit Combination model of security constraint are considered
Object function
The object function that the present invention establishes model is that the outer power transmission transaction of system and electric power in transregional interconnection transaction transprovincially are public The power purchase expense of department is minimum, is shown below：
Wherein, F represents power transmission transaction and the power purchase expense of Utilities Electric Co. in transregional interconnection transaction transprovincially outside system；T Represent the when hop count in research cycle；Unit number in I expression systems；Δ t represents time segment length；Cost_{i,out}Represent ith In unit output, when trade variety is merchandised for outer power transmission, the power purchase expense of Utilities Electric Co.；Cost_{i,cont}Represent that ith of unit goes out In power, when trade variety is transregional interconnection transaction transprovincially, the power purchase expense of Utilities Electric Co.；P_{i,t,cont}Represent unit i at tth Period trade variety is the power generating value of transregional interconnection transaction transprovincially；P_{i,t,out}Represent that unit i is in tth of period trade variety The power generating value of outer power transmission transaction；z_{i,t}Represent unit i in the state of tth of period, z_{i,t}=1 represents to be in open state, z_{i,t}= 0 represents to be in shutdown status.
Constraints
1) unit output bound constrains
In formula：
P_{i,max}, P_{i,min}Represent the upper and lower limit that ith of machine set technology is contributed；P_{i,t,j}Represent unit i in tth of period jth The power generating value of a trade variety；Tra represents trade variety number.
2) the minimum continuous startoff time constraints of unit
T_{i} ^{on}≥MUT_{i}
T_{i} ^{off}≥MDT_{i}
In formula：
T_{i} ^{on}、T_{i} ^{off}Represent the unit i times continuously run and the time continuously stopped transport；
MUT_{i}、MDT_{i}Represent unit i minimums run time and minimum idle time；
3) powerbalance constraint of system
In formula：
D_{t}Represent the system total load of t moment.
4) Transmission Capacity Constraints of circuit
p_{l,min}≤p_{l}≤p_{l,max}
In formula：
p_{l}Represent the power by circuit l；p_{l,min}、p_{l,max}The power upper and lower limit of circuit l is represented respectively.
5) the spare capacity constraint of system
In formula：
R_{t,min}Represent the spinning reserve demand minimum value of t period systems.
More than in addition to 5 constraintss, it is also necessary to the unit including the constraint of unit gross capability, the outer power transmission transaction of participation Transaction Constraint, the unit output constraint for being not involved in outer power transmission transaction, the unit transaction for participating in transregional interconnection transaction transprovincially Constraint and the unit output constraint for being not involved in transregional interconnection transaction transprovincially, it is detailed with Part III that these constrain in second Illustrate.
5th, the acquisition methods of result
As a result acquisition is to establish the outer power transmission transaction of consideration, transprovincially transregional interconnection transaction and the unit group of security constraint In molding type, optimization program is write under VS2008 environment using C Plus Plus, is realized by Cplex API to being mixed in Cplex The calling of integer optimization solver, the solution of implementation model calculate, and finally obtain result.
The Unit Combination model for considering outer power transmission transaction, transprovincially transregional interconnection transaction and security constraint is electric system warp The improvement of Ji scheduling model.Economic Dispatch model is more complicated, especially dynamic economic dispatch model, mathematically Be presented high dimension, nonconvex property, discreteness, nonlinear feature, solve it is difficult, be all the time educational circles's research difficulties it One.The method for solving enlightenment formula method of academia's research, dynamic programming, Lagrangian Relaxation, branch and bound method, heredity The artificial intelligence class algorithm such as algorithm, particle cluster algorithm, ant group algorithm.Now with commercial planning software Cplex, Xpress, The maturation of Gurobi etc., the solution of Optimized model is realized based on these commercialization optimization softwares, can not only reduce engineering technology people The time of member's exploitation program, more times are put into the foundation of model and the design of scheme, model can also be improved and asked Solve accuracy and robustness.Since Electrical Power System Dynamic economic load dispatching model is to consider outer power transmission transaction, transprovincially transregional interconnection Transaction and the basis of the Unit Combination model of security constraint, the present invention realize dynamic economy based on commercial planning software Cplex Scheduling model optimization calculates.Cplex is based on the commercial planning software that various optimization solvers are core.It can solve linear gauge Draw problem and mixed integer programming problem.It can solve the problems, such as linear programming, quadratic programming, quadratic constraints type.
Optimization program is write under VS2008 environment using C Plus Plus, is realized by Cplex API to being mixed in Cplex The calling of integer optimization solver is closed, solves established model.Fig. 3 gives the application flow of model core optimization program.
Simulation example：
Firstly, it is necessary to point out：The model of the present invention is improved on the basis of traditional Economic Dispatch model 's.Solved using Cplex, realize the solution for considering outer power transmission and transregional interconnection transaction optimization problem transprovincially.
The IEEE RTS examples of modification are taken in emulation, and system one shares thermal power generation unit 26, total installation of generating capacity 3105MW, annual peak load 2550MW, occur not considering 6 Hydropower Units in former example in the winter time, in the example of modification, and Hydropower installed capacity has been subtracted in workload demand.It is assumed here that when Δ t=1 is small, the period take 24 it is small when.Grid wiring diagram See Fig. 4, table 1 gives the parameter of unit.Table 2 gives the parameter for participating in outer power transmission transaction.It is transregional transprovincially that table 3 gives participation The parameter of interconnection transaction.Table 4 gives sequential load.Table 5 gives outer power transmission prediction sequential power.Table 6 gives transprovincially Transregional interconnection predicts sequential power.
The parameter of unit in 1 simulation example of table
Table 2 participates in the parameter of outer power transmission transaction
Table 3 participates in the parameter of transregional interconnection transaction transprovincially
4 sequential load of table
5 outer power transmission of table predicts sequential power
Transprovincially transregional interconnection predicts sequential load to table 6
Meanwhile traditional model is contrasted with operating cost and the model emulation of the minimum object function of payment for initiation, as a result It is as follows.Table 7 is the Comparative result of different target function model.It can be seen from the figure that model of the present invention obtain send telephone order outside The electricity charge are sent outside than traditional model purchases by telephone that the electricity charge are less, and transprovincially transregional interconnection power purchase expense is than traditional power purchase expense more It is few.At this time, the output power diagram of unit 5 is shown in Fig. 5.By Fig. 5 it can be seen that the power generating value at 5 each moment of unit, and performance number Trade variety.
7 different target function model Comparative result of table
Can see by abovementioned emulation, this simulation example the result is that feasible, and can guide Utilities Electric Co. exist When considering outer power transmission with transregional interconnection transaction optimization transprovincially, the Unit Combination decisionmaking for considering security constraint is formulated, improves decisionmaking Science and validity, realize that the trading program of Utilities Electric Co. is coordinated and optimized with operation plan, help to optimize Utilities Electric Co. Power purchase strategy and purchases strategies, lifted electricity transaction business lean operation level, reach advantageous effect of the invention.
The present invention is counted for Utilities Electric Co. and the realistic problem of the Unit Combination of transaction composition and security constraint, based on reality Electric system trading program and operation plan requirement, establish consider the transaction of outer power transmission, transregional interconnection transaction transprovincially with it is safe The mathematical model of the Unit Combination of constraint.Electric system trading program and Unit Combination decisionmaking are considered as a whole in modeling process, Coordination optimization, emphasis considers the power purchase Cost Optimization of outer power transmission transaction and transregional interconnection transaction transprovincially in composition of merchandising, The Constraint of outer power transmission transaction and transregional interconnection transaction transprovincially is considered in model.While in order to realize more transaction compositions Identification and classification, by conventional twodimensional unit output Model Extension into threedimensional unit output model, so as to be introduced in Unit Combination Transaction compositional factors.
The mathematical model collectively as decision variable, plans as a whole the unit output of consideration trade variety and start and stop state variable Optimization.The object function of optimization is that the outer power transmission of system is merchandised with the power purchase expense of Utilities Electric Co. in transregional interconnection transaction transprovincially most It is small, the security constraint and the physical constraint of generator operation of constraints including operation of power networks and the transaction of outer power transmission with transprovincially across The Constraint of area's interconnection transaction.The foundation of mathematical model and use can help to need to be related to consider outer power transmission transaction and across The Utilities Electric Co. for saving transregional interconnection transaction carries out the formulation of operation plan, improves the science and validity of decisionmaking, contributes to Optimize the power purchase strategy and purchases strategies of Utilities Electric Co., lift the lean operation level of electricity transaction business.
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JP2004112868A (en) *  20020913  20040408  Toshiba Corp  Power control system and electric power control method 
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JP2004112868A (en) *  20020913  20040408  Toshiba Corp  Power control system and electric power control method 
CN103337039A (en) *  20130428  20131002  国家电网公司  Multitarget multiconstrained medium and long term power purchase decisionmaking method 
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