CN108510158B - Method and device for making inter-area power transmission and reception plan - Google Patents

Method and device for making inter-area power transmission and reception plan Download PDF

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CN108510158B
CN108510158B CN201810187113.5A CN201810187113A CN108510158B CN 108510158 B CN108510158 B CN 108510158B CN 201810187113 A CN201810187113 A CN 201810187113A CN 108510158 B CN108510158 B CN 108510158B
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禤培正
朱继忠
邹金
谢平平
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Research Institute of Southern Power Grid Co Ltd
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Abstract

The invention discloses a method and a device for making an inter-area power transmission and reception plan, wherein the method comprises the following steps: determining a peak regulation demand coefficient alpha of each regional power grid according to the peak regulation demand of each regional power gridi(ii) a According to the peak regulation demand coefficient alpha of each regional power gridiAnd constructing an objective function of an optimization model of the inter-region power transmission and reception plan:
Figure DDA0001590599660000011
establishing a constraint condition of an objective function; and establishing an optimization model of the inter-area power transmission and reception plan according to the objective function and the constraint condition. And performing optimization calculation on the optimization model to obtain an inter-area power transmission and reception plan. According to the technical scheme of the embodiment of the invention, the peak regulation demand coefficient is introduced, so that the optimization model can give consideration to the actual peak regulation demand of each regional power grid, and the complementary characteristics of inter-regional loads and power supplies are considered, so that the peak regulation pressure of each regional power grid can be effectively relieved, the peak regulation capacity of each regional power grid and the economic benefit of power grid operation are improved, and the method has high feasibility and reliability and is suitable for the engineering practice and management system of the large regional power grid in China.

Description

Method and device for making inter-area power transmission and reception plan
Technical Field
The invention relates to the field of power grid economic operation, in particular to a method and a device for making an inter-area power transmission and reception plan.
Background
In power systems, the interconnection of regional grids brings great benefits to safe and economic operation. The multi-region interconnected power system can be used for more reasonably distributing, distributing and supplying power, staggering peaks and valleys, reducing the peak load of the combined system, and more reasonably utilizing various power resources such as water, fire, wind and the like, so that better total benefit is obtained. The whole network resource can be fully utilized by formulating and coordinating the power transmission and receiving plan of each region, and the method is also an effective way for relieving the peak load regulation pressure of the power system.
In the practical situation of large power grid dispatching in China at present, the compilation process of the inter-area power transmission and reception plan is generally that an upper-level dispatching mechanism firstly formulates and issues an initial power transmission and reception plan curve, a lower-level dispatching mechanism compiles a startup and shutdown plan and a power generation plan according to the initial power transmission and reception plan curve, and then the upper-level dispatching mechanism adjusts the initial power transmission and reception plan and forms a final inter-area power transmission and reception plan according to the economical efficiency and safety check results of each province plan. The whole process is essentially a heuristic method based on the priority, not only the workload is large, but also the scheme is not fine and optimized enough, so that the peak regulation capability is insufficient, and the peak regulation pressure in the area with large peak regulation gaps cannot be effectively relieved.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method and an apparatus for making an inter-regional power transmission and reception plan to improve the peak shaving capability of each regional power grid.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a method for making an inter-area power transmission and reception plan, where the method includes:
determining a peak regulation demand coefficient alpha of each regional power grid according to the peak regulation demand of each regional power gridi；
According to the peak regulation demand coefficient alpha of each regional power gridiAn objective function min f (P) of an optimization model of the inter-area power transmission and reception plan is constructedGi，t) The expression of the objective function is as follows:
Figure BDA0001590599640000021
wherein the peak load demand coefficient alphaiThe weight coefficient is used as the optimization target of each regional power grid; pi G(t) is the number of times the ith zone is on time tElectrical power;
Figure BDA0001590599640000022
is the maximum power generation capacity of the ith zone;
establishing a constraint condition of the objective function;
establishing an optimization model of the inter-area power transmission and reception plan according to the objective function and the constraint condition;
and performing optimization calculation on the optimization model to obtain an inter-area power transmission and reception plan.
Further, in the above method, the peak shaving demand coefficient α of each regional power grid is determined according to the peak shaving demand of each regional power gridiThe method comprises the following steps:
receiving peak regulation demand information of each regional power grid;
calculating the peak regulation demand information according to the following formula to obtain the peak regulation demand coefficient alpha of each regional power gridi：
Figure BDA0001590599640000023
Wherein alpha isiIs the peak load factor, Δ P, of the ith regional power gridi LIs the load peak-to-valley difference, Δ P, of the ith regional power gridi GIs the output range, U, of the ith regional gridiIs the maximum up-regulation demand of the ith regional grid, DiIs the maximum turndown demand of the ith regional grid,
Figure BDA0001590599640000024
is the upward ramp rate of the ith regional power grid,
Figure BDA0001590599640000025
is the downward ramp rate of the ith regional power grid.
Further, in the above method, the constraint condition includes:
area power balance constraint: pi G(t)-Pi T(t)-Pi L(t)＝0，
Figure BDA0001590599640000026
t∈T；
Wherein, Pi G(t)、Pi T(t)、Pi L(t) the generated output, the transmitted and received power and the load predicted value of the region i in the time t respectively, wherein S represents a set of transmitting end regions, and R represents a set of receiving end regions;
power transmission and reception balance constraints:
Figure BDA0001590599640000031
where ρ isjIs the network loss coefficient of the sending end region j;
and (3) restricting upper and lower limits of regional power generation:
Figure BDA0001590599640000032
and (3) restricting the climbing rate of regional power generation:
Figure BDA0001590599640000033
outgoing channel capacity constraints:
Figure BDA0001590599640000034
wherein the content of the first and second substances,
Figure BDA0001590599640000035
is the minimum send-out or receive-in capability of the ith regional power grid,
Figure BDA0001590599640000036
is the maximum send-out or receive-in capability of the ith regional power grid;
electric quantity transaction constraint:
Figure BDA0001590599640000037
wherein E isiNThe daily transaction electricity amount agreement value of the ith area is the allowable deviation of the electricity amount.
Further, in the above method, the performing optimization calculation on the optimization model to obtain the inter-region power transmission and reception plan includes:
estimating parameters in the objective function and the constraint condition according to engineering data;
and carrying out optimization solution on the estimated objective function to obtain an inter-area power transmission and reception plan.
In a second aspect, an embodiment of the present invention provides an apparatus for making an inter-area power transmission and reception plan, where the apparatus includes:
a coefficient determining module for determining the peak regulation demand coefficient alpha of each regional power grid according to the peak regulation demand of each regional power gridi；
A function construction module for peak regulation demand coefficient alpha according to each regional power gridiAn objective function min f (P) of an optimization model of the inter-area power transmission and reception plan is constructedGi，t) The expression of the objective function is as follows:
Figure BDA0001590599640000038
wherein the peak load demand coefficient alphaiThe weight coefficient is used as the optimization target of each regional power grid; pi G(t) is the generated power of the ith zone at time period t;
Figure BDA0001590599640000039
is the maximum power generation capacity of the ith zone;
the constraint establishing module is used for establishing constraint conditions of the objective function;
the model establishing module is used for establishing an optimization model of the inter-area power transmission and reception plan according to the objective function and the constraint condition;
and the plan obtaining module is used for carrying out optimization calculation on the optimization model to obtain an inter-area power transmission and reception plan.
Further, in the above apparatus, the coefficient determining module includes:
the information receiving unit is used for receiving peak shaving demand information of each regional power grid;
a coefficient calculating unit, configured to calculate the peak shaving demand information according to the following formula to obtain a peak shaving demand coefficient α of each regional power gridi：
Figure BDA0001590599640000041
Wherein alpha isiIs the peak load factor, Δ P, of the ith regional power gridi LIs the load peak-to-valley difference, Δ P, of the ith regional power gridi GIs the output range, U, of the ith regional gridiIs the maximum up-regulation demand of the ith regional grid, DiIs the maximum turndown demand of the ith regional grid,
Figure BDA0001590599640000042
is the upward ramp rate of the ith regional power grid,
Figure BDA0001590599640000043
is the downward ramp rate of the ith regional power grid.
Further, in the above apparatus, the constraint condition includes:
area power balance constraint: pi G(t)-Pi T(t)-Pi L(t)＝0，
Figure BDA0001590599640000044
t∈T；
Wherein, Pi G(t)、Pi T(t)、Pi L(t) the generated output, the transmitted and received power and the load predicted value of the region i in the time t respectively, wherein S represents a set of transmitting end regions, and R represents a set of receiving end regions;
power transmission and reception balance constraints:
Figure BDA0001590599640000045
where ρ isjIs the network loss coefficient of the sending end region j;
and (3) restricting upper and lower limits of regional power generation:
Figure BDA0001590599640000046
and (3) restricting the climbing rate of regional power generation:
Figure BDA0001590599640000047
outgoing channel capacity constraints:
Figure BDA0001590599640000048
wherein the content of the first and second substances,
Figure BDA0001590599640000051
is the minimum send-out or receive-in capability of the ith regional power grid,
Figure BDA0001590599640000052
is the maximum send-out or receive-in capability of the ith regional power grid;
electric quantity transaction constraint:
Figure BDA0001590599640000053
wherein E isiNThe daily transaction electricity amount agreement value of the ith area is the allowable deviation of the electricity amount.
Further, in the above apparatus, the plan obtaining module includes:
the parameter estimation unit is used for estimating parameters in the objective function and the constraint condition according to engineering data;
and the plan obtaining unit is used for carrying out optimization solution on the estimated objective function to obtain an inter-area power transmission and reception plan.
According to the technical scheme provided by the embodiment of the invention, the peak regulation demand coefficient is introduced, so that the optimization model can give consideration to the actual peak regulation demand of each regional power grid, the complementary characteristics of inter-regional loads and power supplies are considered, the peak regulation pressure of each regional power grid can be effectively relieved, the peak regulation capacity of each regional power grid and the economic benefit of power grid operation are improved, the feasibility and the reliability are high, and the method is suitable for the engineering practice and management system of the large regional power grid in China.
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In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart illustrating a method for making an inter-area power transmission and reception plan according to an embodiment of the present invention;
FIG. 2a is a schematic diagram of a power generation curve (dry period) of a unit in Guangdong province before and after optimization according to an embodiment of the present invention;
FIG. 2b is a schematic diagram of the matching of the Guangdong acceptance curve and the load curve before and after optimization (dry season) in the example provided by the first embodiment of the present invention;
fig. 2c is a schematic diagram of a power generation curve (flood season) of a unit in Guangdong province before and after optimization in the first embodiment of the present invention;
fig. 2d is a schematic diagram of power generation curves (flood season) of the set before and after optimization in Yunnan province provided by the first embodiment of the present invention;
fig. 3 is a flowchart illustrating a method for making an inter-area power transmission and reception plan according to a second embodiment of the present invention;
fig. 4 is a flowchart illustrating a method for making an inter-area power transmission and reception plan according to a third embodiment of the present invention;
fig. 5 is a schematic structural diagram of an apparatus for planning inter-area power transmission and reception according to a second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Referring to fig. 1, a flow chart of a method for making an inter-regional power transmission and reception plan according to an embodiment of the present invention is illustrated, the method is suitable for a scenario where an inter-regional power transmission and reception plan is made for coordinating peak shaving pressures of power grids of each region, and the method is executed by a device for making an inter-regional power transmission and reception plan, which may be implemented by software and/or hardware and integrated inside a power system. The method specifically comprises the following steps:
s101, determining a peak regulation demand coefficient alpha of each regional power grid according to the peak regulation demand of each regional power gridi。
It should be noted that the peak load factor α isiThe parameter introduced by the embodiment of the invention is used for describing the peak regulation requirements of the regional power grid in order to couple the peak regulation requirements of the power grids in different regions and deal with different operation scenes (such as flood season and dry season). Each regional power grid (including a transmitting-end power grid and a receiving-end power grid) has a respective peak load regulation demand coefficient alphai。
S102, according to the peak regulation demand coefficient alpha of each regional power gridiAn objective function min f (P) of an optimization model of the inter-area power transmission and reception plan is constructedGi，t) The expression of the objective function is as follows:
Figure BDA0001590599640000071
wherein the peak load demand coefficient alphaiThe weight coefficient is used as the optimization target of each regional power grid; pi G(t) is the generated power of the ith zone at time period t;
Figure BDA0001590599640000072
is the maximum power generation capacity of the i-th zone.
In order to evaluate the optimization model, an evaluation function including variables, that is, an optimization target, called an objective function, must be constructed, and the objective function is generally expressed by a minimum value. In the embodiment of the invention, the goal of optimizing the inter-area power transmission and reception plan is to minimize the variance of the area daily power generation sequence, namely, to intuitively smooth the power generation curve in the area.
S103, establishing a constraint condition of the objective function.
It should be noted that the objective function can find a set of parameter values under a series of constraints, so that the target value of a certain function or a certain set of functions is optimized. Wherein the constraint condition can be either an equality constraint or an inequality constraint. The key to finding this set of parameter values is: the constraints and target values are satisfied optimally.
And S104, establishing an optimization model of the inter-area power transmission and reception plan according to the objective function and the constraint condition.
It should be noted that the optimization model includes three parts, namely, a design variable, an objective function and a constraint condition, and when the optimization model is established, a decision variable and an objective variable are generally determined first, then an expression of the objective function is determined, and then the constraint condition is found to solve the optimal target. The constraint condition can ensure that the determination of the objective function in the optimization model is more reasonable and accurate.
And S105, performing optimization calculation on the optimization model to obtain an inter-area power transmission and reception plan.
It should be noted that The optimization model of The inter-area power transmission and reception plan established in The above steps is a linear programming model, and mathematical optimization software is used to solve The optimization model, such as The mathematical optimization software of GAMS (The General Algebraic Modeling System, advanced Modeling System for mathematical programming and optimization), AIMMS (System for optimization Modeling), CPLEX, and The like. After the solution is carried out, an inter-area power transmission and reception plan (including an optimized power generation and power transmission and reception curve) can be obtained.
In order to show the implementation process of the first embodiment of the present invention more clearly, a specific example of the data of the south power grid real system is described in detail below.
In the background of southwest power grid west-east power transmission in south, Yunnan and Guizhou are transmitting terminals, Guangdong and Guangxi are receiving terminals, and the power of a connecting line of a Hainan power grid and a Guangdong power grid is generally small and is not considered here. Two operation scenes of flood season and dry season are considered, wherein the flood season takes 2016, 7 and 11 days as an example, and the dry season takes 2016, 11 and 28 days as an example. The inter-domain load, power generation, and power transmission and reception data under the two scenes are shown in tables 1 to 3.
TABLE 1 load and Power Generation situation in southern Power grid provinces during the dry season
Figure BDA0001590599640000081
TABLE 2 load and Power Generation situation in southern Power grid provinces during flood season
Figure BDA0001590599640000082
Table 3 power transmission and reception data of south power grid under two scenes
Figure BDA0001590599640000083
Figure BDA0001590599640000091
In order to ensure the fairness and the effectiveness of comparison, input data (including data such as electric quantity, section constraint, load prediction and the like) of the power transmission and reception optimization model are day-ahead data, and optimized power generation and power transmission and reception curves are obtained by solving the optimization model. Compared with the actual day-ahead power transmission plan (marked as "actual" and representing the actual plan rather than the actual day-ahead power transmission power) of the power grid, the specific analysis is as follows:
(1) analysis of calculation result of dry season
In the dry season, the power and electricity regulation capability of a transmitting end power grid is strong (especially in Yunnan), and peak regulation is carried out by preferentially matching a receiving end power grid (especially in Guangdong) through a west-east power transmission channel. The optimization effect of the technical scheme provided by the embodiment of the invention is analyzed as follows:
FIG. 2a shows the matching of the power generation curves of the units in Guangdong province before and after optimization. Therefore, the peak-to-valley difference of the optimized power generation curve is reduced by 6002MW, the curve is smoother as a whole, and on the other hand, the problem of unit back-tuning is also improved.
Fig. 2b is a comparison of the load curve and the Guangdong acceptance curve before and after optimization. It can be seen that: 1) the load peak appears at the 46 th time period, the original receiving curve stops rising at the 40 th time period, and the peak value of the optimized receiving curve also appears at the 46 th time period (consistent with the load curve); 2) between the time periods 47-50, the load of the Guangdong province is reduced by 11090MW, which is the time period with the maximum load power change, the original receiving curve only reduces 4682MW between the time periods 47-50, the unit in the Guangdong province still needs to bear a peak regulation gap of 6408MW, the optimized receiving curve reduces 9006MW, and the peak regulation gap is reduced to 2083 MW. In conclusion, in the dry season, the optimized Guangdong acceptance curve is more matched with the load curve, and the peak regulation effect on the Guangdong is greater.
(2) Analysis of flood season calculation results
During the flood season, on one hand, surplus water in Yunnan needs to be conveyed to Guangdong areas, the West-east electricity conveying channel runs at a higher power level, and at the moment, more provincial units are used for peak regulation in Guangdong areas; on the other hand, as the Yunnan water is fully generated, peak regulation pressure also exists in the Yunnan province. The optimization effect of the technical scheme provided by the embodiment of the invention is analyzed as follows:
the generating curves of the units in Guangdong and Yunnan before and after optimization of each province are shown in figures 2 c-2 d. It can be seen that:
the peak-valley difference of the Guangdong power generation curves before and after optimization is not changed greatly, but the optimized power generation curves become smoother, and meanwhile, the generation and regulation phenomena of the unit are eliminated (the original power generation curves are reversely regulated in the periods 37, 80 and 89);
after optimization, the peak-to-valley difference of the Yunnan power generation curve is reduced by 2638MW, and the pressure of intraductal peak regulation of Yunnan is reduced.
In conclusion, through the optimization of the technical scheme provided by the embodiment of the invention, the power generation curve in Yunnan province, which is rich in water and electricity, is obviously improved in the flood season, and the power generation curve in Guangdong province is also improved to a certain extent.
(3) Conclusion of the examples
And optimizing a power transmission and receiving plan based on the power supply and load complementary characteristics of each region, so that the economic operation of the power grid of each region can be effectively promoted. The two-stage power transmission and reception plan optimization model established by the invention considers the actual peak regulation requirements of each province, simultaneously considers different operation scenes of flood season and dry season, and obtains the following conclusion through the example analysis of the power grid in the south:
in a dry season, through optimization of the technical scheme provided by the embodiment of the invention, the input curve of the Guangdong is more matched with the load curve, so that a greater effect is exerted on peak regulation of the Guangdong, and the operation condition of the receiving-end thermal power unit is optimized; on the other hand, the peak-to-valley difference of the provincial power generation curve of Guangdong is reduced, and Yunnan is increased, but the hydropower regulation capacity of Yunnan is enough to meet the demand of provincial peak regulation.
In flood season, by optimizing the technical scheme provided by the embodiment of the invention, the peak regulation effect of the receiving-end thermal power generating unit is fully exerted, the water and electricity delivery level of the Yunnan valley section is improved, and the maximum capacity of clean energy is realized.
According to the technical scheme provided by the embodiment of the invention, the peak regulation demand coefficient is introduced, so that the optimization model can give consideration to the actual peak regulation demand of each regional power grid, the complementary characteristics of inter-regional loads and power supplies are considered, the peak regulation pressure of each regional power grid can be effectively relieved, the peak regulation capacity of each regional power grid and the economic benefit of power grid operation are improved, the feasibility and the reliability are high, and the method is suitable for the engineering practice and management system of the large regional power grid in China.
Example two
As shown in fig. 3, the method for making the inter-regional power transmission and reception plan according to the second embodiment of the present invention is based on the technical solution provided in the first embodiment, and determines the peak shaving demand coefficient α of each regional power grid according to the peak shaving demand of each regional power grid in step S101 ″i"further optimization. Andexplanations of the same or corresponding terms in the above embodiments are omitted. Namely:
receiving peak regulation demand information of each regional power grid;
calculating the peak regulation demand information according to the following formula to obtain the peak regulation demand coefficient alpha of each regional power gridi：
Figure BDA0001590599640000111
Wherein alpha isiIs the peak load factor, Δ P, of the ith regional power gridi LIs the load peak-to-valley difference, Δ P, of the ith regional power gridi GIs the output range, U, of the ith regional gridiIs the maximum up-regulation demand of the ith regional grid, DiIs the maximum turndown demand of the ith regional grid,
Figure BDA0001590599640000112
is the upward ramp rate of the ith regional power grid,
Figure BDA0001590599640000113
is the downward ramp rate of the ith regional power grid.
Based on the above optimization, as shown in fig. 3, the method for making the inter-area power transmission and reception plan according to this embodiment may include the following steps:
s201, receiving peak regulation demand information of each regional power grid.
It should be noted that each regional power grid receiving coordination needs to submit peak-shaving demand information, where the peak-shaving demand information includes load peak-valley value difference, output range, maximum up-shaving demand, maximum down-shaving demand, upward climbing rate, downward climbing rate, and the like of the regional power grid.
S202, calculating the peak regulation demand information according to the following formula to obtain the peak regulation demand coefficient alpha of each regional power gridi：
Figure BDA0001590599640000121
Wherein alpha isiIs the peak load factor, Δ P, of the ith regional power gridi LIs the load peak-to-valley difference, Δ P, of the ith regional power gridi GIs the output range, U, of the ith regional gridiIs the maximum up-regulation demand of the ith regional grid, DiIs the maximum turndown demand of the ith regional grid,
Figure BDA0001590599640000122
is the upward ramp rate of the ith regional power grid,
Figure BDA0001590599640000123
is the downward ramp rate of the ith regional power grid.
It should be noted that each regional power grid, including the transmitting-end power grid and the receiving-end power grid, has its own peak shaving demand coefficient αiAnd the peak regulation demand coefficient is calculated in the same way.
S203, according to the peak regulation demand coefficient alpha of each regional power gridiAn objective function min f (P) of an optimization model of the inter-area power transmission and reception plan is constructedGi，t) The expression of the objective function is as follows:
Figure BDA0001590599640000124
wherein the peak load demand coefficient alphaiThe weight coefficient is used as the optimization target of each regional power grid; pi G(t) is the generated power of the ith zone at time period t;
Figure BDA0001590599640000125
is the maximum power generation capacity of the i-th zone.
And S204, establishing a constraint condition of the objective function.
In one embodiment, preferably, the constraint condition includes:
regional power balance constraints, for eachThe regional power grid is used for generating power equal to the sum of load power and transmitted and received power: pi G(t)-Pi T(t)-Pi L(t)＝0，
Figure BDA0001590599640000126
t∈T；
Wherein, Pi G(t)、Pi T(t)、Pi L(t) the generated output, the transmitted and received power and the load predicted value of the region i in the time t respectively, wherein S represents a set of transmitting end regions, and R represents a set of receiving end regions;
the power transmission and reception is constrained by power balance, and the total outgoing power of the transmitting end area minus the network loss is equal to the total incoming power of the receiving end area:
Figure BDA0001590599640000127
where ρ isjIs the network loss coefficient of the sending end region j;
and (3) restricting upper and lower limits of regional power generation, wherein the power generation power of each region needs to be within the output range of the power generation capacity of the region:
Figure BDA0001590599640000131
and (3) restricting the climbing rate of regional power generation, wherein the power generation power of each region needs to be within the output range of the power generation capacity of the region:
Figure BDA0001590599640000132
and (3) carrying out capacity constraint of the channel, wherein due to the limitation of the transmission power of the channel, the regional power transmission and reception needs to meet the corresponding constraint:
Figure BDA0001590599640000133
wherein the content of the first and second substances,
Figure BDA0001590599640000134
is the minimum send-out or receive-in capability of the ith regional power grid,
Figure BDA0001590599640000135
is the maximum send-out or receive-in capability of the ith regional power grid;
and (3) electric quantity transaction constraint, wherein in order to meet daily electric quantity constraint of inter-provincial transaction, the peak-valley value of the power transmission and receiving curve needs to meet electric quantity contract constraint:
Figure BDA0001590599640000136
wherein E isiNThe daily transaction electricity amount agreement value of the ith area is the allowable deviation of the electricity amount.
And S205, establishing an optimization model of the inter-area power transmission and reception plan according to the objective function and the constraint condition.
And S206, carrying out optimization calculation on the optimization model to obtain an inter-area power transmission and reception plan.
According to the technical scheme provided by the embodiment of the invention, the peak regulation demand coefficient is introduced and is taken as the weight coefficient of the optimization target of each regional power grid, so that the optimization model can give consideration to the actual peak regulation demand of each regional power grid, the complementary characteristics of inter-regional loads and power supplies are considered, the peak regulation pressure of each regional power grid can be effectively relieved, the peak regulation capacity of each regional power grid and the economic benefit of power grid operation are improved, the feasibility and the reliability are high, and the method is suitable for the engineering practice and management system of the large regional power grid in China.
EXAMPLE III
Fig. 4 is a schematic flow chart of a method for making an inter-area power transmission and reception plan according to a third embodiment of the present invention, and in this embodiment, based on the second embodiment, further optimization of the inter-area power transmission and reception plan is obtained by performing optimization calculation on the optimization model in step S206. Explanations of the same or corresponding terms as those of the above embodiments are omitted. Namely:
estimating parameters in the objective function and the constraint condition according to engineering data;
and carrying out optimization solution on the estimated objective function to obtain an inter-area power transmission and reception plan.
Based on the above optimization, as shown in fig. 4, the method for making the inter-area power transmission and reception plan according to this embodiment may include the following steps:
s301, peak shaving demand information of each regional power grid is received.
S302, calculating the peak regulation demand information according to the following formula to obtain the peak regulation demand coefficient alpha of each regional power gridi：
Figure BDA0001590599640000141
Wherein alpha isiIs the peak load factor, Δ P, of the ith regional power gridi LIs the load peak-to-valley difference, Δ P, of the ith regional power gridi GIs the output range, U, of the ith regional gridiIs the maximum up-regulation demand of the ith regional grid, DiIs the maximum turndown demand of the ith regional grid,
Figure BDA0001590599640000142
is the upward ramp rate of the ith regional power grid,
Figure BDA0001590599640000143
is the downward ramp rate of the ith regional power grid.
S303, according to the peak regulation demand coefficient alpha of each regional power gridiAn objective function min f (P) of an optimization model of the inter-area power transmission and reception plan is constructedGi，t) The expression of the objective function is as follows:
Figure BDA0001590599640000144
wherein the peak load demand coefficient alphaiThe weight coefficient is used as the optimization target of each regional power grid; pi G(t) is the generated power of the ith zone at time period t;
Figure BDA0001590599640000145
is the maximum power generation capacity of the i-th zone.
And S304, establishing a constraint condition of the objective function.
S305, establishing an optimization model of the inter-area power transmission and reception plan according to the objective function and the constraint conditions.
And S306, estimating parameters in the objective function and the constraint condition according to the engineering data.
Specifically, estimating the sum of upper and lower limits of regional power generation
Figure BDA0001590599640000146
To know
Figure BDA0001590599640000147
Calculating the adjustable output according to the' installed capacity-maintenance capacity-limited capacity
Figure BDA0001590599640000148
Estimating minimum output assuming a certain condition
Figure BDA0001590599640000149
For example, for a coal-fired unit, the peak regulation depth is the lowest according to the actual condition, and the hydropower valley output in the flood season is taken as 0.6-0.9 times of the average output according to the load of all the starting-up except temporary stopping, overhauling and coal shortage stopping. Further, the power generation range of the available region is
Figure BDA0001590599640000151
Estimating the upper and lower power limits of the junctor:
Pi T(t) represents the sum of the powers on all the links connecting zone i with other zones, so
Figure BDA0001590599640000152
Taking the sum of the rated capacity of each tie-back line,
Figure BDA0001590599640000153
take 0.
Estimating the climbing rate of regional power generation:
the calculation of the region power generation climbing rate is limited by two factors: before the power transmission plan is released, the starting plan in each area is unknown; the total power generation climbing rate of the region is not equal to the simple superposition of the climbing rates of all the startup units.
Preferably, the embodiment of the present invention provides the following method for estimating the upper and lower limits of the tie line power:
and multiplying the installed capacity of each power supply subjected to overhauling and limitation in the region by a coefficient to obtain the rated climbing rate. The rated climbing rate (measured in 15 minutes) of each type of unit is 22.5 percent of the rated capacity of the coal-fired unit, 45 percent of the rated capacity of the gas-fired and oil-fired unit, 100 percent of the rated capacity of hydropower and pumped storage, and nuclear power and new energy do not consider adjustment. Calculating the rated climbing rate of the regional power generation by the following formula:
Figure BDA0001590599640000154
wherein, Type is { hydroelectric power, coal power, gas power, pumped storage }, PGi，typeNRepresenting installed capacity, r, of a certain power type in area itypeRepresenting the coefficient of the rate of climb, T, of this type of power supplyGiNIs the nominal ramp rate for zone i. The actually adopted upper and lower limits of the climbing rate are respectively determined by the following formulas:
Figure BDA0001590599640000155
Figure BDA0001590599640000156
other parameters of the estimation model:
network loss coefficient rhojTaking the value as the average network loss rate of the area in the past year; the allowable deviation value of the daily electric quantity transaction between the areas is 2% -5%; the load size P of each time interval can be obtained according to the load prediction result of each regional power gridi L(t) thereby obtaining a peak-to-valley difference Δ P of the load curvei L。
And S307, carrying out optimization solution on the estimated objective function to obtain an inter-area power transmission and reception plan.
Specifically, after optimization solution, power generation curves and power transmission curves after inter-region optimization are obtained.
According to the technical scheme provided by the embodiment of the invention, the peak regulation demand coefficient is introduced and is taken as the weight coefficient of the optimization target of each regional power grid, so that the optimization model can give consideration to the actual peak regulation demand of each regional power grid, the complementary characteristics of inter-regional loads and power supplies are considered, the peak regulation pressure of each regional power grid can be effectively relieved, the peak regulation capacity of each regional power grid and the economic benefit of power grid operation are improved, the feasibility and the reliability are high, and the method is suitable for the engineering practice and management system of the large regional power grid in China.
Example four
Fig. 5 is a schematic structural diagram of an apparatus for making an inter-regional power transmission and reception plan according to a fourth embodiment of the present invention, which is suitable for executing the method for making an inter-regional power transmission and reception plan according to the fourth embodiment of the present invention. The device specifically comprises the following modules:
a coefficient determining module 41, configured to determine a peak shaving demand coefficient α of each regional power grid according to the peak shaving demand of each regional power gridi；
A function constructing module 42, configured to construct a peak load demand coefficient α according to the grid load demand coefficient of each regioniAn objective function min f (P) of an optimization model of the inter-area power transmission and reception plan is constructedGi，t) The expression of the objective function is as follows:
Figure BDA0001590599640000161
wherein the peak load demand coefficient alphaiThe weight coefficient is used as the optimization target of each regional power grid; pi G(t) is the generated power of the ith zone at time period t;
Figure BDA0001590599640000162
is the maximum power generation capacity of the ith zone;
a constraint establishing module 43, configured to establish a constraint condition of the objective function;
and the model establishing module 44 is configured to establish an optimization model of the inter-area power transmission and reception plan according to the objective function and the constraint condition.
And a plan obtaining module 45, configured to perform optimization calculation on the optimization model to obtain an inter-region power transmission and reception plan.
According to the technical scheme provided by the embodiment of the invention, the peak regulation demand coefficient alpha of each regional power grid is determined according to the peak regulation demand of each regional power gridi(ii) a According to the peak regulation demand coefficient alpha of each regional power gridiAn objective function min f (P) of an optimization model of the inter-area power transmission and reception plan is constructedGi，t) The expression of the objective function is as follows:
Figure BDA0001590599640000171
wherein the peak load demand coefficient alphaiThe weight coefficient is used as the optimization target of each regional power grid; pi G(t) is the generated power of the ith zone at time period t;
Figure BDA0001590599640000172
is the maximum power generation capacity of the ith zone; establishing a constraint condition of the objective function; and establishing an optimization model of the inter-area power transmission and reception plan according to the objective function and the constraint condition. And performing optimization calculation on the optimization model to obtain an inter-area power transmission and reception plan. Based on the method and the device, the peak regulation demand coefficient is introduced, so that the optimization model can give consideration to the actual peak regulation demand of each regional power grid, the complementary characteristics of inter-regional loads and power supplies are considered, the peak regulation pressure of each regional power grid can be effectively relieved, the peak regulation capacity of each regional power grid and the economic benefit of power grid operation are improved, the feasibility and the reliability are high, and the method and the device are suitable for the engineering practice and management system of the large regional power grid in China.
Preferably, the coefficient determination module includes:
the information receiving unit is used for receiving peak shaving demand information of each regional power grid;
a coefficient calculating unit, configured to calculate the peak shaving demand information according to the following formula to obtain a peak shaving demand coefficient α of each regional power gridi：
Figure BDA0001590599640000173
Wherein alpha isiIs the peak load factor, Δ P, of the ith regional power gridi LIs the load peak-to-valley difference, Δ P, of the ith regional power gridi GIs the output range, U, of the ith regional gridiIs the maximum up-regulation demand of the ith regional grid, DiIs the maximum turndown demand of the ith regional grid,
Figure BDA0001590599640000174
is the upward ramp rate of the ith regional power grid,
Figure BDA0001590599640000175
is the downward ramp rate of the ith regional power grid.
Preferably, the constraint condition includes:
area power balance constraint: pi G(t)-Pi T(t)-Pi L(t)＝0，
Figure BDA0001590599640000176
t∈T；
Wherein, Pi G(t)、Pi T(t)、Pi L(t) the generated output, the transmitted and received power and the load predicted value of the region i in the time t respectively, wherein S represents a set of transmitting end regions, and R represents a set of receiving end regions;
power transmission and reception balance constraints:
Figure BDA0001590599640000177
where ρ isjIs the network loss coefficient of the sending end region j;
and (3) restricting upper and lower limits of regional power generation:
Figure BDA0001590599640000181
and (3) restricting the climbing rate of regional power generation:
Figure BDA0001590599640000182
outgoing channel capacity constraints:
Figure BDA0001590599640000183
wherein the content of the first and second substances,
Figure BDA0001590599640000184
is the minimum send-out or receive-in capability of the ith regional power grid,
Figure BDA0001590599640000185
is the maximum send-out or receive-in capability of the ith regional power grid;
electric quantity transaction constraint:
Figure BDA0001590599640000186
wherein E isiNThe daily transaction electricity amount agreement value of the ith area is the allowable deviation of the electricity amount.
Preferably, the plan obtaining module includes:
the parameter estimation unit is used for estimating parameters in the objective function and the constraint condition according to engineering data;
and the plan obtaining unit is used for carrying out optimization solution on the estimated objective function to obtain an inter-area power transmission and reception plan.
The device can execute the method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.

Claims (6)

1. A method for making an inter-area power transmission and reception plan, comprising:
determining a peak regulation demand coefficient alpha of each regional power grid according to the peak regulation demand of each regional power gridi；
According to the peak regulation demand coefficient alpha of each regional power gridiAn objective function minf (P) of an optimization model of the inter-region power transmission and reception plan is constructedGi，t) The expression of the objective function is as follows:
Figure FDA0002682410440000011
wherein the peak load demand coefficient alphaiThe weight coefficient is used as the optimization target of each regional power grid; pi G(t) is the generated power of the ith zone at time period t;
Figure FDA0002682410440000013
is the maximum power generation capacity of the ith zone;
establishing a constraint condition of the objective function;
establishing an optimization model of the inter-area power transmission and reception plan according to the objective function and the constraint condition;
performing optimization calculation on the optimization model to obtain an inter-area power transmission and reception plan;
determining a peak regulation demand coefficient alpha of each regional power grid according to the peak regulation demand of each regional power gridiThe method comprises the following steps:
receiving peak regulation demand information of each regional power grid;
calculating the peak regulation demand information according to the following formula to obtain the peak regulation demand coefficient alpha of each regional power gridi：
Figure FDA0002682410440000014
Wherein alpha isiIs the peak load factor, Δ P, of the ith regional power gridi LIs the load peak-to-valley difference, Δ P, of the ith regional power gridi GIs the output range, U, of the ith regional gridiIs the maximum up-regulation demand of the ith regional grid, DiIs the maximum turndown demand of the ith regional grid,
Figure FDA0002682410440000015
is the upward ramp rate of the ith regional power grid,
Figure FDA0002682410440000016
is the downward ramp rate of the ith regional power grid.
2. The method of claim 1, wherein the constraints comprise:
area power balance constraint:
Figure DEST_PATH_IMAGE002
；
wherein, Pi T(t)、Pi L(t) power and load prediction values of transmission and reception in the area i in the time period t, S represents a set of transmission and reception areas, and R represents reception and reception areasA set of end regions;
power transmission and reception balance constraints:
Figure FDA0002682410440000021
where ρ isjIs the network loss coefficient of the sending end region j;
and (3) restricting upper and lower limits of regional power generation:
Figure FDA0002682410440000022
and (3) restricting the climbing rate of regional power generation:
Figure FDA0002682410440000023
outgoing channel capacity constraints:
Figure FDA0002682410440000024
wherein the content of the first and second substances,
Figure FDA0002682410440000025
is the minimum power generation capacity of the ith zone;
Figure FDA0002682410440000026
is the minimum send-out or receive-in capability of the ith regional power grid,
Figure FDA0002682410440000027
is the maximum send-out or receive-in capability of the ith regional power grid;
electric quantity transaction constraint:
Figure FDA0002682410440000028
wherein E isiNThe daily transaction electricity amount agreement value of the ith area is the allowable deviation of the electricity amount.
3. The method of claim 2, wherein the performing optimization calculations on the optimization model to obtain an inter-region power delivery and reception plan comprises:
estimating parameters in the objective function and the constraint condition according to engineering data;
and carrying out optimization solution on the estimated objective function to obtain an inter-area power transmission and reception plan.
4. An apparatus for planning power transmission and reception between areas, comprising:
a coefficient determining module for determining the peak regulation demand coefficient alpha of each regional power grid according to the peak regulation demand of each regional power gridi；
A function construction module for peak regulation demand coefficient alpha according to each regional power gridiAn objective function minf (P) of an optimization model of the inter-region power transmission and reception plan is constructedGi，t) The expression of the objective function is as follows:
Figure FDA0002682410440000029
wherein the peak load demand coefficient alphaiThe weight coefficient is used as the optimization target of each regional power grid; pi G(t) is the generated power of the ith zone at time period t;
Figure FDA0002682410440000031
is the maximum power generation capacity of the ith zone;
the constraint establishing module is used for establishing constraint conditions of the objective function;
the model establishing module is used for establishing an optimization model of the inter-area power transmission and reception plan according to the objective function and the constraint condition;
the plan obtaining module is used for carrying out optimization calculation on the optimization model to obtain an inter-area power transmission and reception plan;
wherein the coefficient determination module comprises:
the information receiving unit is used for receiving peak shaving demand information of each regional power grid;
a coefficient calculating unit, configured to calculate the peak shaving demand information according to the following formula to obtain a peak shaving demand coefficient α of each regional power gridi：
Figure FDA0002682410440000032
Wherein alpha isiIs the peak load factor, Δ P, of the ith regional power gridi LIs the load peak-to-valley difference, Δ P, of the ith regional power gridi GIs the output range, U, of the ith regional gridiIs the maximum up-regulation demand of the ith regional grid, DiIs the maximum turndown demand of the ith regional grid,
Figure FDA0002682410440000033
is the upward ramp rate of the ith regional power grid,
Figure FDA0002682410440000034
is the downward ramp rate of the ith regional power grid.
5. The apparatus of claim 4, wherein the constraints comprise:
area power balance constraint:
Figure 413845DEST_PATH_IMAGE002
；
wherein, Pi T(t)、Pi L(t) power transmission and reception, and a predicted load value in a period t for each of the areas i, S representing a set of transmitting areas, and R representing a set of receiving areas;
power transmission and reception balance constraints:
Figure FDA0002682410440000036
where ρ isjIs the network loss coefficient of the sending end region j;
and (3) restricting upper and lower limits of regional power generation:
Figure FDA0002682410440000037
and (3) restricting the climbing rate of regional power generation:
Figure FDA0002682410440000041
outgoing channel capacity constraints:
Figure FDA0002682410440000042
wherein the content of the first and second substances,
Figure FDA0002682410440000043
is the minimum power generation capacity of the ith zone;
Figure FDA0002682410440000044
is the minimum send-out or receive-in capability of the ith regional power grid,
Figure FDA0002682410440000045
is the maximum send-out or receive-in capability of the ith regional power grid;
electric quantity transaction constraint:
Figure FDA0002682410440000046
wherein E isiNThe daily transaction electricity amount agreement value of the ith area is the allowable deviation of the electricity amount.
6. The apparatus of claim 5, wherein the plan obtaining module comprises:
the parameter estimation unit is used for estimating parameters in the objective function and the constraint condition according to engineering data;
and the plan obtaining unit is used for carrying out optimization solution on the estimated objective function to obtain an inter-area power transmission and reception plan.
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