CN104598991A - Unit combination acquiring method considering out-going power transaction, transprovincial or interregional line transaction and security constraint - Google Patents

Abstract

The invention discloses a unit combination acquiring method considering out-going power transaction, transprovincial or interregional line transaction and security constraint. The method is characterized in that the transaction plan an operation plan of a power company are treated as the background, a mathematical model facing transaction component is created to solve the problem that the economic characteristics of transaction variety and rules are to be reflected in the power transaction; the optimized target function is that the cost of the power company purchasing out-going power transaction and transprovincial or interregional line transaction is minimized; the constraint conditions include security constraint for the power grid operation, physical constraint for unit operation, and transaction component constraint. With the adoption of the method, the power company considering the transaction variety and rules can prepare the transaction plan and the operation plan, so that the decision-making science and effectiveness can be improved; the power purchase strategy and power purchase cost of the power company can be optimized, and as a result, the lean operation level of the power transaction service can be raised.

Description

Consider the Unit Combination acquisition methods of the transaction of outer power transmission, transprovincially transregional interconnection transaction and security constraint

Technical field

The invention belongs to the Unit Combination field that Utilities Electric Co. takes into account transaction composition and security constraint, particularly relate to and consider that outer power transmission is concluded the business and the transregional interconnection formulation of operation plan of concluding the business transprovincially.

Background technology

From electricity market reform situation in recent years, in the main regional power grid unified electricity market process of construction carried out of country, because each province's level of economic development is different, the impact of the not equal many factors of electricity price level, electricity market reform encounters larger difficulty and resistance, regional power grid unified electricity market, in the coordination etc. of process each side concerned interests, is also faced with various complicated sharp contradiction.Meanwhile, for meeting the fast-developing needs of social economy, alleviate power supply contradiction, effectively solve short of electricity with nest the electric and situation of depositing, need badly and realize energy resources in China and distribute rationally.Along with alternating current-direct current extra-high voltage progressively puts into operation, between Ge great district and province, grid contact is day by day tight, for the most optimum distribution of resources realizing nationwide provides solid hardware foundation.Therefore, between Ge great district and province and inside the province trading program becomes the key point realizing global resource and distribute rationally.

Because electricity transaction is not limited in the physical characteristics such as unit, circuit for the modeling of resource, more often also need to embody the economic performance such as trade variety, trading rules.Therefore, under the target that global resource is distributed rationally, need the characteristic for different electricity transaction composition badly, overall planning, study the power generation dispatching towards transaction composition.In transaction composition, what the outer power transmission transaction of emphasis consideration here and transprovincially transregional interconnection were concluded the business distributes rationally.

Unit Combination under Power Market should consider that Network Security Constraints has become a kind of common recognition.The transmission of electric power must be rely on electric power networks, and follows specific physics law, namely always along the path that impedance is minimum.That is this on electricity market, be difficult to determine the relation between concrete consumer and concrete provider.The problem that the impact of network also can cause the power trade of different directions mutually to restrict.Therefore, Unit Combination only takes into account the constraint of electric power networks, could realize optimum power trade while the safe and reliable operation ensureing electrical network.

Summary of the invention

The object of the present invention is to provide a kind of Unit Combination acquisition methods considering the transaction of outer power transmission, transprovincially transregional interconnection transaction and security constraint.

For achieving the above object, present invention employs following technical scheme.

The first step, the dimension of optimized variable unit output is expanded to three-dimensional, and wherein the first dimension is the time, and the second dimension is unit output value, the third dimension is the trade variety of the power of the assembling unit, and trade variety comprises the transaction of outer power transmission, transprovincially transregional interconnection transaction and concludes the business with basic electricity;

Second step, set up Optimized model, the objective function of Optimized model is that outer power transmission transaction and the transprovincially transregional interconnection of system power purchase expense of conclude the business is minimum, and the constraint condition of Optimized model comprises the constraint of unit gross capability, participate in the unit transaction Constraint of outer power transmission transaction, do not participate in the unit output constraint of outer power transmission transaction, participate in the unit transaction Constraint of transregional interconnection transaction transprovincially and do not participate in the unit output that transregional interconnection transprovincially concludes the business retrains;

3rd step, to Optimized model solve obtain power purchase expense minimum time each trade variety of unit go out force value.

Described unit gross capability constraint representation is:

$\underset{j=1}{\overset{\mathrm{Tra}}{\mathrm{\Σ}}}{P}_{i,t,j}=P_{i,t}$

Wherein, Tra represents trade variety number; P _i,trepresent the gross capability value of unit i t time period; P _{i, t, j}represent that unit i goes out force value at a t time period jth trade variety.

The unit transaction Constraint of the outer power transmission transaction of described participation is expressed as:

$\underset{i=1}{\overset{\mathrm{Iout}}{\mathrm{\Σ}}}\underset{t=1}{\overset{\mathrm{Tout}}{\mathrm{\Σ}}}(P_{i,t,\mathrm{out}}*\mathrm{\Δt})={\stackrel{\‾}{Q}}_{e,\mathrm{Tout}}$

Wherein, represent the outer power transmission trade contract charge value signed at contract time Tout; Tout represents the outer power transmission trade contract time; Iout represents the unit number participating in the transaction of outer power transmission; P _{i, t, out}represent unit i t time period trade variety be outer power transmission conclude the business go out force value; Δ t represents time period length.

The described unit output constraint representation not participating in the transaction of outer power transmission is:

$P_{i_{\mathrm{not}},t,\mathrm{out}}=0$

Wherein, i _notrepresent the unit not participating in the transaction of outer power transmission.

The unit transaction Constraint of described participation transregional interconnection transaction is transprovincially expressed as:

$\underset{i=1}{\overset{\mathrm{Icont}}{\mathrm{\Σ}}}\underset{t=1}{\overset{\mathrm{Tcont}}{\mathrm{\Σ}}}(P_{i,t,\mathrm{cont}}*\mathrm{\Δt})={\stackrel{\‾}{Q}}_{c,\mathrm{Tcont}}$

Wherein, represent the transregional interconnection trade contract charge value signed at contract time Tcont transprovincially; Tcont represents the transregional interconnection trade contract time transprovincially; Icont represents the unit number of participation transregional interconnection transaction transprovincially; P _{i, t, cont}represent unit i t time period trade variety be transprovincially transregional interconnection conclude the business go out force value; Δ t represents time period length.

The described unit output constraint representation not participating in transregional interconnection transaction is transprovincially:

$P_{i_{\mathrm{not}},t,\mathrm{cont}}=0$

Wherein, i _notrepresent the unit not participating in transregional interconnection transaction transprovincially.

The constraint condition of described Optimized model also comprises the constraint of unit output bound, the power-balance of the minimum continuous start-off time constraints of unit, system retrains, the margin capacity of system retrains and the Transmission Capacity Constraints of circuit.

Described objective function is expressed as:

$\min F=\underset{t=1}{\overset{T}{\mathrm{\Σ}}}\underset{i=1}{\overset{I}{\mathrm{\Σ}}}(P_{i,t,\mathrm{out}}*\mathrm{\Δt}*{\mathrm{Cost}}_{i,\mathrm{out}}+P_{i,t,\mathrm{cont}}*\mathrm{\Δt}*{\mathrm{Cost}}_{i,\mathrm{cont}})*z_{i,t}$

Wherein, F represents the power purchase expense of Utilities Electric Co. in the outer power transmission transaction of system and transprovincially transregional interconnection are concluded the business; T represents the time hop count in research cycle; Unit number in I expression system; Δ t represents time period length; Cost _{i, out}in representing that unit i exerts oneself, when trade variety is the transaction of outer power transmission, the power purchase expense of Utilities Electric Co.; Cost _{i, cont}in representing that unit i exerts oneself, when trade variety is transregional interconnection transaction transprovincially, the power purchase expense of Utilities Electric Co.; P _{i, t, cont}represent unit i t time period trade variety be transprovincially transregional interconnection conclude the business go out force value; P _{i, t, out}represent unit i t time period trade variety be outer power transmission conclude the business go out force value, z _i,t=1 represents that unit i is in open state t time period, z _i,t=0 represents that unit i is in stopped status t time period.

Beneficial effect of the present invention is embodied in:

By classifying to the transaction composition of unit output in the present invention, conventional two-dimensional unit output Model Extension is become three-dimensional unit output model, thus in Unit Combination, introduce transaction compositional factors, and set up the outer power transmission transaction of consideration on this basis, the mathematical model of the Unit Combination of transregional interconnection transaction and security constraint transprovincially, in concluding the business with the transaction of power transmission outside and transprovincially transregional interconnection, Utilities Electric Co.'s purchases strategies is minimum is optimized for target, for considering that outer power transmission provides powerful guarantee with the formulation of transprovincially transregional interconnection trading program and operation plan, trade variety and rule can be embodied in the modeling of electricity transaction for resource, realize trading program and the operation plan coordination optimization of Utilities Electric Co., improve science and the validity of decision-making, adapt to concentrate the requirement of united market operation after disposing.

Accompanying drawing explanation

Fig. 1 is conventional rack combined two-dimension model;

Fig. 2 is the Unit Combination three-dimensional model considering transaction composition;

Fig. 3 be model solve schematic flow sheet;

Fig. 4 is grid wiring diagram, wherein: BUS represents bus;

Fig. 5 is power diagram of each constantly of the unit 5 exerting oneself;

Embodiment

Below in conjunction with drawings and Examples, the invention will be further described.

One, unit output dimension is expanded

The identification how realizing many transaction compositions with sort out be sets up consider that outer power transmission is concluded the business, transprovincially transregional interconnection conclude the business and the basis of 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 model, and the unit output in model is and time, two-dimentional continuous variable that unit is relevant.Particularly, each unit has a power stage state in the time span of some settings; There is a power stage state some units each time period in the time span of research.

When introducing multi-exchange composition, the power that every platform unit sends just is provided with trade variety attribute.Can understand like this, if certain time period of unit exerts oneself as P, so m ₁the trade variety of %*P power is basic electricity transaction, m ₂the trade variety of %*P power is the transaction of outer power transmission, m ₃the trade variety of %*P power is transregional interconnection transaction transprovincially.Wherein, the number percent summation shared by each trade variety is 1, is expressed as m ₁+ m ₂+ m ₃=100.Here, the electric power of power transmission transaction except basic electricity refers to, transprovincially transregional interconnection transaction and special deal composition, special deal composition is Direct Purchase of Electric Energy by Large Users and Generation Rights Trade.

At this moment, consider that transaction composition and the Unit Combination model of security constraint should change three dimensionality model into by two traditional dimensional model, the unit output in model is and time, unit, three-dimensional continuous variable that transaction composition is relevant.Particularly, each unit has a power stage state in the time span of some settings; There is a power stage state some units each time period in the time span of research; Each unit to be exerted oneself a trade variety attribute in each time period, as shown in Figure 2.

Analyze according in Fig. 2, unit is exerted oneself as P at time t (1), and so a part of power transaction composition is the transaction of outer power transmission, and a part of power transaction composition is transregional interconnection transaction transprovincially, and some power transaction composition is basic electricity transaction.

From the above mentioned, in the modeling considering transaction composition, power needs to carry out the process of expansion dimension, becomes three dimensionality model by two-dimensions model extension originally.This is the modeling optimized integration considering multi-exchange composition.

The trade variety of unit output is concluded the business by basic electricity transaction, outer power transmission and transprovincially transregional interconnection transaction is formed, therefore unit gross capability is expressed as:

$\underset{j=1}{\overset{\mathrm{Tra}}{\mathrm{\Σ}}}{P}_{i,t,j}=P_{i,t}$

Wherein, Tra represents trade variety number; P _i,trepresent the gross capability value of unit i t period; P _{i, t, j}represent that unit i goes out force value at a t period jth trade variety.

Two, the transaction of outer power transmission in a model take into account mode

Outer power transmission transaction mainly refers to the outer power transmission transaction of region class, electrical network level Utilities Electric Co..This transaction is not enough or need to occur during other grid transmissions due to other reasons at certain Utilities Electric Co. electric power, and this transaction generally launches between the adjacent power company of close together.Outer power transmission transaction embodies all to some extent in the constraint condition and objective function of model.The take into account mode of outer power transmission transaction in objective function is shown in Part IV.

The transaction of outer power transmission in constraint condition to take into account mode as follows:

If adopt annual contract trade mode between net, Utilities Electric Co. predicts according to annual electrical demand, through consulting to determine electricity price, signing between year net and purchasing sale of electricity contract.The unit transaction Constraint so participating in the transaction of outer power transmission is expressed as:

$\underset{i=1}{\overset{\mathrm{Iout}}{\mathrm{\Σ}}}\underset{t=1}{\overset{\mathrm{Tout}}{\mathrm{\Σ}}}(P_{i,t,\mathrm{out}}*\mathrm{\Δt})={\stackrel{\‾}{Q}}_{e,\mathrm{Tout}}$

Wherein, represent the outer power transmission trade contract charge value signed at contract time Tout; Tout represents the outer power transmission trade contract time; Iout represents the unit number participating in the transaction of outer power transmission; P _{i, t, out}represent unit i t period trade variety be outer power transmission conclude the business go out force value; Δ t represents time period length.

And the unit output constraint representation not participating in the transaction of outer power transmission is:

$P_{i_{\mathrm{not}},t,\mathrm{out}}=0$

Wherein, i _notrepresent the unit not participating in the transaction of outer power transmission.

Three, transregional interconnection transaction transprovincially in a model take into account mode

Interconnecting ties electricity transaction scale embodies the tightness degree that electrical network connects each other from a side.Each partition power grid, for the consideration of security and economy, often needs the exchange power on agreement interconnection, concludes the business according to bilateral electricity contract.In addition, for ensureing that electrical network is at the power demand normally and under accident mode, enough power should be had between partition power grid and support ability.Electric Power Network Planning is by optimizing electricity transaction scale between partition power grid, strengthen the construction of interconnecting ties passage, improve partition power grid power delivery and support ability, make planning operation of power networks more flexible, for electricity transaction provides powerful guarantee, maximum magnitude realizes global resource energy-consuming.

Transregional interconnection transaction transprovincially embodies all to some extent in the constraint condition and objective function of model.Transprovincially the take into account mode of transregional interconnection transaction in objective function is shown in Part IV.

Transregional interconnection transaction transprovincially in constraint condition to take into account mode as follows:

Each partition power grid, for the consideration of security and economy, often needs the exchange power on agreement interconnection, concludes the business according to bilateral electricity contract.Now, the unit transaction Constraint participating in transregional interconnection transaction is transprovincially expressed as:

$\underset{i=1}{\overset{\mathrm{Icont}}{\mathrm{\Σ}}}\underset{t=1}{\overset{\mathrm{Tcont}}{\mathrm{\Σ}}}(P_{i,t,\mathrm{cont}}*\mathrm{\Δt})={\stackrel{\‾}{Q}}_{c,\mathrm{Tcont}}$

Wherein, represent the transregional interconnection trade contract charge value signed at contract time Tcont transprovincially; Tcont represents the transregional interconnection trade contract time transprovincially; Icont represents the unit number of participation transregional interconnection transaction transprovincially; P _{i, t, cont}represent unit i t period trade variety be transprovincially transregional interconnection conclude the business go out force value; Δ t represents time period length.

And the unit output constraint representation not participating in transregional interconnection transaction is transprovincially:

$P_{i_{\mathrm{not}},t,\mathrm{cont}}=0$

Wherein, i _notrepresent the unit not participating in transregional interconnection transaction transprovincially.

Four, the Unit Combination model of the transaction of outer power transmission, transprovincially transregional interconnection transaction and security constraint is considered

Objective function

The objective function of Modling model of the present invention during to be the transaction of system outer power transmission conclude the business with transprovincially transregional interconnection the power purchase expense of Utilities Electric Co. minimum, be shown below:

$\min F=\underset{t=1}{\overset{T}{\mathrm{\Σ}}}\underset{i=1}{\overset{I}{\mathrm{\Σ}}}(P_{i,t,\mathrm{out}}*\mathrm{\Δt}*{\mathrm{Cost}}_{i,\mathrm{out}}+P_{i,t,\mathrm{cont}}*\mathrm{\Δt}*{\mathrm{Cost}}_{i,\mathrm{cont}})*z_{i,t}$

Wherein, F represents the power purchase expense of Utilities Electric Co. in the outer power transmission transaction of system and transprovincially transregional interconnection are concluded the business; T represents the time hop count in research cycle; Unit number in I expression system; Δ t represents time period length; Cost _{i, out}represent in i-th unit output, when trade variety is the transaction of outer power transmission, the power purchase expense of Utilities Electric Co.; Cost _{i, cont}represent in i-th unit output, when trade variety is transregional interconnection transaction transprovincially, the power purchase expense of Utilities Electric Co.; P _{i, t, cont}represent unit i t period trade variety be transprovincially transregional interconnection conclude the business go out force value; P _{i, t, out}represent unit i t period trade variety be outer power transmission conclude the business go out force value; z _i,trepresent the state of unit i t period, z _i,t=1 expression is in open state, z _i,t=0 expression is in stopped status.

Constraint condition

1) unit output bound constraint

$P_{i,\min }\≤\underset{j=1}{\overset{\mathrm{Tra}}{\mathrm{\Σ}}}{P}_{i,t,j}\≤P_{i,\max }$

In formula:

P _{i, max}, P _{i, min}represent the upper and lower limit that i-th machine set technology is exerted oneself; P _{i, t, j}represent that unit i goes out force value at a t period jth trade variety; Tra represents trade variety number.

2) the minimum continuous start-off time constraints of unit

${T_i}^{\mathrm{on}}\≥{\mathrm{MUT}}_i$

${T_i}^{\mathrm{off}}\≥{\mathrm{MDT}}_i$

In formula:

the time representing the time that unit i runs continuously and stop transport continuously;

MUT _i, MDT _irepresent unit i minimum working time and minimum idle time;

3) the power-balance constraint of system

$\underset{i=1}{\overset{I}{\mathrm{\Σ}}}\underset{j=1}{\overset{\mathrm{Tra}}{\mathrm{\Σ}}}{P}_{i,t,j}=D_t$

In formula:

D _trepresent the system total load of t.

4) Transmission Capacity Constraints of circuit

$p_{l,\min }\≤p_l\≤p_{l,\max }$

In formula:

P _lrepresent the power by circuit l; p _{l, min}, p _{l, max}represent the power upper and lower limit of circuit l respectively.

5) the margin capacity constraint of system

$\underset{i=1}{\overset{I}{\mathrm{\Σ}}}{z}_{i,t}(P_{i,\max }-\underset{j=1}{\overset{\mathrm{Tra}}{\mathrm{\Σ}}}{P}_{i,t,j})\≥R_{t,\min }$

In formula:

R _{t, min}represent the spinning reserve demand minimum value of t period system.

Except above 5 constraint conditions, also need to comprise the constraint of unit gross capability, participate in the unit transaction Constraint of outer power transmission transaction, do not participate in the unit output constraint of outer power transmission transaction, participate in the unit transaction Constraint of transregional interconnection transaction transprovincially and do not participate in the unit output constraint of transregional interconnection transaction transprovincially, these constrain in second and Part III elaborate.

Five, the acquisition methods of result

The acquisition of result is being set up on the Unit Combination model considering the transaction of outer power transmission, transprovincially transregional interconnection transaction and security constraint, C Plus Plus is adopted to write optimizer under VS2008 environment, calling mixed integer optimization solver in Cplex is realized by Cplex API, implementation model solve calculating, finally obtain result.

Consider that the transaction of outer power transmission, transprovincially transregional interconnection transaction and the Unit Combination model of security constraint are the improvement of Economic Dispatch model.Economic Dispatch model more complicated, especially dynamic economic dispatch model, mathematically present high dimension, nonconvex property, discreteness, nonlinear feature, solve difficulty, is one of difficulties of educational circles's research all the time.The enlightening formula method of method for solving of academia's research, dynamic programming, Lagrangian Relaxation, branch and bound method, the artificial intelligence class algorithms such as genetic algorithm, particle cluster algorithm, ant group algorithm.At present along with commercial planning software Cplex, Xpress, the maturation of Guobi etc., solving of Optimized model is realized based on these commercial Optimization Softwares, not only can reduce the time that engineering technical personnel develop program, the more time is put in the foundation of model and the design of scheme, model solution accuracy and robustness can also be improved.Because Electrical Power System Dynamic economic load dispatching model considers the transaction of outer power transmission, transprovincially transregional interconnection transaction and the basis of the Unit Combination model of security constraint, the present invention is based on commercial planning software Cplex, achieve dynamic economic dispatch model optimization and calculate.Cplex is the commercial planning software of core based on various Optimization Solution device.It can solve linear programming problem and mixed integer programming problem.It can solve the problem of linear programming, quadratic programming, quadratic constraints type.

Adopt C Plus Plus to write optimizer under VS2008 environment, achieve calling mixed integer optimization solver in Cplex by Cplex API, solve set up model.Fig. 3 gives the application flow of model core optimizer.

Simulation example:

First, it may be noted that: model of the present invention improves on the basis of traditional Economic Dispatch model.Cplex is used to solve, solving of the realization outer power transmission of consideration and transprovincially transregional interconnection transaction optimization problem.

The IEEE RTS example revised is taked in emulation, and system one has thermal power generation unit 26, total installation of generating capacity 3105MW, annual peak load 2550MW, appear at winter, do not consider 6 Hydropower Unit in former example in the example of amendment, and in workload demand, deducted hydropower installed capacity.Here suppose Δ t=1 hour, the period gets 24 hours.Fig. 4 is shown in by grid wiring diagram, and table 1 gives the parameter of unit.Table 2 gives the parameter participating in the transaction of outer power transmission.Table 3 gives the parameter of participation transregional interconnection transaction transprovincially.Table 4 gives sequential load.Table 5 gives outer power transmission prediction sequential power.Table 6 gives transregional interconnection prediction sequential power transprovincially.

The parameter of unit in table 1 simulation example

Table 2 participates in the parameter of outer power transmission transaction

Table 3 participates in the parameter of transregional interconnection transaction transprovincially

Table 4 sequential load

Time period	Load value (MW)	Time period	Load value (MW)
				1	1923	13	2293.5
2	1923	14	2293.5
				3	1923	15	2293.5
4	1923	16	2293.5
				5	1923	17	2293.5
6	1923	18	2293.5
				7	1923	19	2293.5
8	1923	20	2293.5
				9	1923	21	2293.5
10	1923	22	2293.5
				11	1923	23	2293.5
12	1923	24	2293.5

Table 5 outer power transmission prediction sequential power

Time period	Send electric power value (MW) outside	Time period	Send electric power value (MW) outside
				1	200	13	200
2	200	14	150
				3	200	15	90
4	200	16	90
				5	200	17	90
6	200	18	90
				7	200	19	90
8	200	20	90
				9	200	21	90
10	200	22	90

11	200	23	90
				12	200	24	90

Table 6 is transregional interconnection prediction sequential load transprovincially

Time period	Dominant eigenvalues value (MW)	Time period	Dominant eigenvalues value (MW)
				1	150	13	90
2	150	14	90
				3	150	15	90
4	150	16	90
				5	150	17	90
6	150	18	90
				7	150	19	90
8	150	20	90
				9	150	21	90
10	150	22	90
				11	150	23	90
12	150	24	90

Meanwhile, contrast traditional model with operating cost and the minimum model emulation for objective function of payment for initiation, result is as follows.Table 7 is Comparative result of different target function model.As can be seen from the figure, what model of the present invention obtained send outside purchases by telephone the electricity charge and sends than traditional model that to purchase by telephone the electricity charge less outside, and transprovincially transregional interconnection power purchase expense is more less than traditional power purchase expense.Now, the power diagram of exerting oneself of unit 5 is shown in Fig. 5.That can see each moment of unit 5 by Fig. 5 goes out force value, and the trade variety of performance number.

Table 7 different target function model Comparative result

Can be seen by above-mentioned emulation, this simulation example result is feasible, and can guide Utilities Electric Co. consider outer power transmission and transprovincially transregional interconnection transaction optimization time, formulate the Unit Combination decision-making considering security constraint, improve science and the validity of decision-making, realize trading program and the operation plan coordination optimization of Utilities Electric Co., contribute to power purchase strategy and the purchases strategies of optimizing Utilities Electric Co., promote the lean operation level of electricity transaction business, reach the beneficial effect of the invention.

The present invention is directed to the realistic problem that Utilities Electric Co. takes into account the Unit Combination of transaction composition and security constraint, based on electric system trading program and the operation plan requirement of reality, set up the mathematical model considering the transaction of outer power transmission, the transprovincially Unit Combination of transregional interconnection transaction and security constraint.In modeling process, electric system trading program and Unit Combination decision-making are considered as a whole, coordination optimization, in transaction composition, emphasis considers the power purchase Cost Optimization that the transaction of outer power transmission and transprovincially transregional interconnection conclude the businesss, considers outer power transmission in a model and concludes the business and the transprovincially transregional interconnection Constraint of concluding the business.Simultaneously in order to realize identification and the classification of many transaction compositions, conventional two-dimensional unit output Model Extension being become three-dimensional unit output model, thus in Unit Combination, introduces transaction compositional factors.

This mathematical model, using considering that the unit output of trade variety and the unification of start and stop state variable are as decision variable, is planned as a whole to optimize.The objective function optimized during to be the transaction of system outer power transmission conclude the business with transprovincially transregional interconnection the power purchase expense of Utilities Electric Co. minimum, constraint condition comprises the security constraint of operation of power networks and the physical constraint of generator operation and outer power transmission and concludes the business and the transprovincially transregional interconnection Constraint of concluding the business.The foundation of mathematical model considers that outer power transmission is concluded the business and transregional interconnection is concluded the business Utilities Electric Co. carries out the formulation of operation plan transprovincially with using can help to need to relate to, improve science and the validity of decision-making, contribute to power purchase strategy and the purchases strategies of optimizing Utilities Electric Co., promote the lean operation level of electricity transaction business.

Claims (8)

1. consider the transaction of outer power transmission, transprovincially transregional interconnection transaction and a Unit Combination acquisition methods for security constraint, it is characterized in that: comprise the following steps:

The first step, the dimension of optimized variable unit output is expanded to three-dimensional, and wherein the first dimension is the time, and the second dimension is unit output value, the third dimension is the trade variety of the power of the assembling unit, and trade variety comprises the transaction of outer power transmission, transprovincially transregional interconnection transaction and concludes the business with basic electricity;

Second step, set up Optimized model, the objective function of Optimized model is that outer power transmission transaction and the transprovincially transregional interconnection of system power purchase expense of conclude the business is minimum, and the constraint condition of Optimized model comprises the constraint of unit gross capability, participate in the unit transaction Constraint of outer power transmission transaction, do not participate in the unit output constraint of outer power transmission transaction, participate in the unit transaction Constraint of transregional interconnection transaction transprovincially and do not participate in the unit output that transregional interconnection transprovincially concludes the business retrains;

3rd step, to Optimized model solve obtain power purchase expense minimum time each trade variety of unit go out force value.

2. a kind ofly according to claim 1 consider the transaction of outer power transmission, transregional interconnection transaction transprovincially and the Unit Combination acquisition methods of security constraint, it is characterized in that: described unit gross capability constraint representation is:

$\underset{j=1}{\overset{\mathrm{Tra}}{\mathrm{\Σ}}}{P}_{i,t,j}=P_{i,t}$

Wherein, Tra represents trade variety number; P _i,trepresent the gross capability value of unit i t time period; P _{i, t, j}represent that unit i goes out force value at a t time period jth trade variety.

3. a kind ofly according to claim 1 consider the transaction of outer power transmission, transregional interconnection transaction transprovincially and the Unit Combination acquisition methods of security constraint, it is characterized in that: the unit transaction Constraint of the outer power transmission transaction of described participation is expressed as:

$\underset{i=1}{\overset{\mathrm{Iout}}{\mathrm{\Σ}}}\underset{t=1}{\overset{\mathrm{Tout}}{\mathrm{\Σ}}}(P_{i,t,\mathrm{out}}*\mathrm{\Δt})={\stackrel{\‾}{Q}}_{e,\mathrm{Tout}}$

Wherein, represent the outer power transmission trade contract charge value signed at contract time Tout; Tout represents the outer power transmission trade contract time; Iout represents the unit number participating in the transaction of outer power transmission; P _{i, t, out}represent unit i t time period trade variety be outer power transmission conclude the business go out force value; Δ t represents time period length.

4. a kind ofly according to claim 1 consider the transaction of outer power transmission, transregional interconnection transaction transprovincially and the Unit Combination acquisition methods of security constraint, it is characterized in that: the described unit output constraint representation not participating in the transaction of outer power transmission is:

$P_{i_{\mathrm{not}},t,\mathrm{out}}=0$

Wherein, i _notrepresent the unit not participating in the transaction of outer power transmission.

5. a kind ofly according to claim 1 consider the transaction of outer power transmission, transregional interconnection transaction transprovincially and the Unit Combination acquisition methods of security constraint, it is characterized in that: the unit transaction Constraint of described participation transregional interconnection transaction is transprovincially expressed as:

$\underset{i=1}{\overset{\mathrm{Icont}}{\mathrm{\Σ}}}\underset{t=1}{\overset{\mathrm{Tcont}}{\mathrm{\Σ}}}(P_{i,t,\mathrm{cont}}*\mathrm{\Δt})={\stackrel{\‾}{Q}}_{c,\mathrm{Tcont}}$

Wherein, represent the transregional interconnection trade contract charge value signed at contract time Tcont transprovincially; Tcont represents the transregional interconnection trade contract time transprovincially; Icont represents the unit number of participation transregional interconnection transaction transprovincially; P _{i, t, cont}represent unit i t time period trade variety be transprovincially transregional interconnection conclude the business go out force value; Δ t represents time period length.

6. a kind ofly according to claim 1 consider the transaction of outer power transmission, transregional interconnection transaction transprovincially and the Unit Combination acquisition methods of security constraint, it is characterized in that: the described unit output constraint representation not participating in transregional interconnection transaction is transprovincially:

$P_{i_{\mathrm{not}},t,\mathrm{cont}}=0$

Wherein, i _notrepresent the unit not participating in transregional interconnection transaction transprovincially.

7. a kind ofly according to claim 1 consider the transaction of outer power transmission, transregional interconnection transaction transprovincially and the Unit Combination acquisition methods of security constraint, it is characterized in that: the constraint condition of described Optimized model also comprises the constraint of unit output bound, the power-balance constraint of the minimum continuous start-off time constraints of unit, system, the margin capacity of system retrain and the Transmission Capacity Constraints of circuit.

8. a kind ofly according to claim 1 consider the transaction of outer power transmission, transregional interconnection transaction transprovincially and the Unit Combination acquisition methods of security constraint, it is characterized in that: described objective function is expressed as:

$\min F=\underset{t=1}{\overset{T}{\mathrm{\Σ}}}\underset{i=1}{\overset{I}{\mathrm{\Σ}}}(P_{i,t,\mathrm{out}}*\mathrm{\Δt}*{\mathrm{Cost}}_{i,\mathrm{out}}+P_{i,t,\mathrm{cont}}*\mathrm{\Δt}*{\mathrm{Cost}}_{i,\mathrm{cont}})*z_{i,t}$

Wherein, F represents the power purchase expense of Utilities Electric Co. in the outer power transmission transaction of system and transprovincially transregional interconnection are concluded the business; T represents the time hop count in research cycle; Unit number in I expression system; Δ t represents time period length; Cost _{i, out}in representing that unit i exerts oneself, when trade variety is the transaction of outer power transmission, the power purchase expense of Utilities Electric Co.; Cost _{i, cont}in representing that unit i exerts oneself, when trade variety is transregional interconnection transaction transprovincially, the power purchase expense of Utilities Electric Co.; P _{i, t, cont}represent unit i t time period trade variety be transprovincially transregional interconnection conclude the business go out force value; P _{i, t, out}represent unit i t time period trade variety be outer power transmission conclude the business go out force value, z _i,t=1 represents that unit i is in open state t time period, z _i,t=0 represents that unit i is in stopped status t time period.