CN102609824A - Method for acquiring trading capacity index of electric energy at gate under multi-element power generation structure - Google Patents
Method for acquiring trading capacity index of electric energy at gate under multi-element power generation structure Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to a method for acquiring trading capacity index of electric energy at a gate under a multi-element power generation structure, which comprises the steps: 1, providing basic information of a power grid, wherein the basic information of the power grid includes basic information and real time information; 2, providing trading basis information, wherein the trading basis information includes ''public administration'' information, trans-provincial and trans-regional trading information, power generation right trading information and large consumer direct power supply information; 3, selecting a calculation date; 4, setting the calculation sequence of four trading varieties or various trading varieties corresponding to the trading basis information; and 5, calculating the trading capacity of the gate by a simplex method to obtain the maximum delivery trading capacity of the gate and the delivery trading capacities of units. According to the invention, the integrity and the accuracy of information of calculation date can be ensured, smooth completion of annual plan is guaranteed to realize roll-calculation, points and spheres are combined, and a plenty of storage space and calculation time can be saved.
Description
Technical field
The invention belongs to Operation of Electric Systems analysis field, it is related to the acquisition methods of power trade capacity index in critical point under polynary electrification structure.
Background technology
With the progressively structure continued to develop with Trading System in market, most of theoretical research in terms of transaction is concentrated on pattern, method of commerce and the related algorithm of transaction, with certain perspective.How on the basis of these researchs further analysis power network send outside critical point can trading electricity or electricity ability so that merchandise more abundant to the running optimizatin of resource and system;How the actual conditions of the system and the trading operations pattern of electricity market are combined, assessment system can participate in transprovincially available resources for sending transaction outside such as transregional in time, excavation for trading volume and necessary guidance is provided and referred to;How to guide or limit some power plant and participate in outer power transmission transaction, increase the transparency and fairness of the electricity transaction market promotionProblems above does not carry out systematic discussion and research still in existing achievement in research.
The content of the invention
It is an object of the invention to provide a kind of acquisition methods of critical point power trade capacity index under polynary electrification structure.
The present invention is realized using following scheme:The acquisition methods of critical point power trade capacity index under a kind of polynary electrification structure, it is characterised in that comprise the following steps:
Step 1:Power network Back ground Information is provided, the power network Back ground Information includes essential information and real time information;
Step 2:Basis of business information is provided, the basis of business information includes " three is public " information, transprovincially transregional Transaction Information, Generation Rights Trade information and large user's direct-furnish power information;
Step 3:The specific time to be calculated is selected, that is, calculates day, discontinuity surface, the information of discontinuity surface when having 96 when the day was one with 15 minutes;
Step 4:According to actual needs, four trade varieties corresponding to the basis of business information or wherein several trade varieties carry out the setting of computation sequence;
Step 5:Calculated as follows day with reference to calculating according to computation sequence:
Step 51:The setting of object function is carried out, to maximize the remaining trading capacity in critical point as target, object function is set:
In formula:The trading capacity at critical point is represented, as all operating units of power network can be sent to the trend sum at critical point;Critical point then refers to the outlet of this province electricity sent outside;
Step 52:The setting of constraints is carried out, constraints is set(2)With(3):
In formula:、Represent respectivelyThe actual trend and maximum allowable trend of branch road; ForThe EIAJ of platform generating set,The sum of actually exerting oneself distributed for unit in four trade varieties,Represent thePlatform unit is exerted oneself;
Step 53:According to above-mentioned object function and constraints, the calculating of critical point trading capacity is carried out using simplex method, show that critical point maximum sends trading capacity outside and each unit sends trading capacity outside.
The method of the present invention can ensure that integrality, the accuracy for calculating day information;It can ensure that annual plan is smoothly completed, realize rolling calculation;The combination in point and face can be realized;A large amount of memory spaces can be saved and the time is calculated, and the index drawn can provide help as electrical management human assessment's index for electrical management.
Brief description of the drawings
Fig. 1 is the inventive method principle process schematic diagram.
Embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention will be further described.
The method of the present invention is polynary electrification structure(That is the various energy resources such as water power, nuclear power, wind-powered electricity generation, thermoelectricity generate electricity and deposited)Under, constrained by system physical rack and unit performance, calculate the maximum critical point trading capacity having based on system under a certain start-up mode and load level, refer to the inventive method principle process schematic diagram in Fig. 1, Fig. 1.The implementation method of the present invention comprises the following steps:
Step 1:Power network Back ground Information is provided, the power network Back ground Information includes essential information and real time information;
Step 2:Basis of business information is provided, the basis of business information includes " three is public " information, transprovincially transregional Transaction Information, Generation Rights Trade information and large user's direct-furnish power information;
Step 3:The specific time to be calculated is selected, that is, calculates day, discontinuity surface, the information of discontinuity surface when having 96 when the day was one with 15 minutes;
Step 4:According to actual needs, to four trade varieties in the basis of business information or wherein, several trade varieties set computation sequence;
Step 5:Calculated as follows day with reference to calculating according to computation sequence:
1st, the setting of object function.This method is to maximize the remaining trading capacity in critical point as target, i.e., in this province workload demand and to have signed under transaction Contract Energy, calculating critical point maximum trading capacity and each unit sends trading capacity outside under this target.
In formula:The trading capacity at critical point is represented, as all operating units of power network can be sent to the trend sum at critical point;Critical point then refers to the outlet of this province electricity sent outside.
2nd, the setting of constraints.Due to being limited by circuit transmission capacity, the trading capacity at critical point is not the remaining generated output sum of every unit, and although some units have more residue to exert oneself, but can not be generated electricity because the limitation of trend on circuit is sent out, therefore produce constraints(2).Unit need to meet this province power network workload demand, reliability requirement and sign transaction contractual requirement when participating in sending transaction outside.If this province network load and having signed transaction Contract Energy and needing thePlatform unit exert oneself for, then unit, which participates in exerting oneself for outer power transmission, to be adjusted in exerting oneself at present for unit between unit EIAJ, therefore produces constraints (3).
(2)
In formula:、Represent respectivelyThe actual trend and maximum allowable trend of branch road; ForThe EIAJ of platform generating set,It is unit in four transaction modules(" three public affairs " are dispatched, have signed transregional transaction transprovincially, signed Generation Rights Trade, signed large user's direct-furnish transaction)The sum of actually exerting oneself of middle distribution,Represent thePlatform unit is exerted oneself.
3rd, the determination of calculation method.
Based on formula(1)、(2)、(3)All without nonlinear terms in formula, Selection utilization simplex method is solved to above mentioned problem.Due to having in constraintsWithThe two amounts, therefore need to first calculate.To the trend of circuitCalculating acquisition is carried out using DC power flow.It is rightThen need to consider the method for salary distribution of existing Contract Energy.Contract transaction main at present is " three public " scheduling, transprovincially transregional transaction, Generation Rights Trade, large user's direct-furnish transaction.Due in each market to more than four classes merchandise arrange sequencing it is different, some transaction must preferentially ensure its complete, then come before.Therefore, calculatingWhen, need first to be ranked up existing trade variety according to the requirement of power network, then the distribution of unit output is carried out as follows respectively to existing trade variety, if the sum of exerting oneself that each transaction modules is assigned to certain unit has exceeded its limit value, then limit and that last transaction is come in unit participation trading order, until unit exert oneself it is not out-of-limit untill, so drawPlatform unit is exerted oneself。
Our circulars to " three is public " scheduling, transprovincially transregional transaction, Generation Rights Trade and the transaction of the class of large user's direct power supply four are described below:
(1)" three is public " scheduling electricity output distribution
To participating in " three public " the decomposition of the train unit row Contract generation of transaction so that the deviation of " three is public " electricity is completed between each train unit no more than the ratio allowed, it is ensured that the fairness and reasonability of power energy allocation between each train unit.Under conditions of above-mentioned target is met, it is contemplated that service system operation constraint, unit performance constraint, calculated using period dynamic programming algorithm is become.If using complete-period electrification planning optimization model, though disclosure satisfy that the requirement of " three is public " scheduling, amount of calculation is big, and time-consuming length can not be ignored.By taking beginning of the year generation schedule as an example, according to every 15 minutes be one when discontinuity surface, 365 days 1 year calculate, then during the calculating of complete-period electrification plan discontinuity surface sum be 35040, current hardware device can not meet the calculating requirement of generation schedule a few days ago, it is impossible to applied to power network actual production demand.Time interval is calculated if increased, although be disclosure satisfy that calculating time requirement, but can not be met short term scheduling operation demand again.In " three is public " scheduling, the requirements of plan to different periods is different.Wherein, plan day day part unit plan requires very high to computational accuracy, is mainly used in management and running and operation instruction.However, for the plan after several weeks or several moons, computational accuracy requirement is reduced successively.Therefore, the project has used change period generation schedule Optimized model.Choosing period of time principle:Plan day with every 15 minutes for 1 period, next day was 1 period with every 1 hour, of that month remaining each day take 1 day be 1 period, it is 1 period to take within secondary month per ten days, is then taken to the end of the year afterwards monthly as 1 period.When period interval was more than 1 day, workload demand is averaged.By taking 20 days April in 2011 as an example, the period is chosen as follows:It is 1 period to take every 15 minutes on April 20, and it is 1 period to take every 1 hour on April 21, and it is 1 period to take 1 day April 22 to April 30, and it is 1 period to take per ten days May 1 to May 31, and it was monthly 1 period to take June to December, altogether 139 periods.
Object function:Deviation is minimum each other for the deviation of each train unit yearly plan generated energy and Contract generation.
In formula:、、、Is represented respectivelyIndividual train unit is from the plan generated energy in plan day to the end of the year, from the beginning of the year to plan day completed actual power generation, the Contract generation in the whole year, the deviation for planning electricity and Contract generation;For from plan day to the end of the year when hop count;ForIndividual train unit existsThe plan of period is exerted oneself;To participate in the train unit set of " three is public " scheduling;For the Period Length of plan, the value is variable, is changed according to the optimization time from the distance of plan day, and more remote from plan day, non-intellectual is bigger, and required precision is lower, and time span is longer, can thus save the substantial amounts of calculating time.
Constraints includes:
(a)System balancing is constrained:
1)Generating Constraints of Equilibrium
2)System fading margin Reserve Constraint
3)System spinning reserve is constrained
In formula:、、Respectively systemLoad, regulation stand-by requirement amount and the spinning reserve demand of period;For unit number of units;、For unitThe regulation spare capacity and spinning reserve capacity that can be provided.
(b)Plan the constraint of electricity maximum deviation:
In formula:、Is represented respectivelyThe maximum deviation of the deviation of individual train unit plan electricity and Contract generation, plan electricity and Contract generation.
(c)Unit operation is constrained:
1)Unit output bound is constrained
2)The operation of unit minimum is constrained with downtime duration
3)Unit follow load ability
4)Unit adjusts Reserve Constraint
5)Unit spinning reserve is constrained
6)Unit Commitment count constraint
7) constraint must be opened and must stopped to unit
8)Unit firm output is constrained
9)Machine group exert oneself bound constraint
During the above is various:、、、Unit is represented respectivelyExert oneself maximum and minimum value, machine groupExert oneself maximum and minimum value;IfRepresent unit Period is in open state, ifRepresent unit Period is in stopped status;、Unit is represented respectively The start duration of period and downtime duration;、Unit is represented respectivelyThe minimum start duration and minimum downtime duration;、Unit in a period is represented respectivelyDrop exert oneself speed with emersion power speed;For unit Whether the period has start, and value is 1 if start, is otherwise 0;For unitAllow the number of times of start from plan day to the end of the year;、、Expression must start shooting group set, group set and a firm output unit set must be shut down;ForPlatform unit existsThe firm output of period;For machine groupThe number of units of middle unit,For the title of machine group.
(d)Power system security constraints
(2), Generation Rights Trade and transprovincially transregional transaction output distribution
Generation Rights Trade and the transprovincially purpose of transregional transaction are provided to optimize resource, energy-saving and emission-reduction.Therefore, the object function of this two class transaction is all the maximization of social utility, while considering system security constraint and electric network swim constraint, above-mentioned transaction is realized using the algorithm of " High-low Match ".
Object function:
Transprovincially the object function of transregional transaction is that both parties' benefit and social utility are maximized, i.e.,
In formula:,For the quotation of power purchase side and sale of electricity side;The electricity struck a bargain for purchase seller;The set of electricity side is sold to participate in transregional transaction transprovincially;The set of electricity side is bought in participate in transregional transaction transprovincially.
The object function of Generation Rights Trade maximizes for social utility, i.e.,
In formula:、The respectively quotation of Generation Right transferor and assignee;The electricity struck a bargain for transferor and assignee;To participate in Generation Rights Trade transferor set;To participate in Generation Rights Trade assignee set.
Constraints includes:
(a)Transregional transaction constraint transprovincially:Interregional interconnection transmission line capability
In above formula、RepresentThe trend that period interconnection is flowed into and exported;、For interconnection output and input power maximum, minimum limit value.The transmission capacity of interconnection can meet the requirement of interconnection minimum capacity under normal circumstances, thus only consider that transmission capacity exceeds the situation of interconnection maximum transfer capacity.
(b)Transregional transaction constraint transprovincially:One's respective area system restriction
1)Generating Constraints of Equilibrium
2)System fading margin Reserve Constraint
3)System spinning reserve is constrained
In above formula:、、Respectively systemLoad, regulation stand-by requirement and the spinning reserve demand of period;For the number of units of unit;、For unitThe regulation spare capacity and spinning reserve capacity that can be provided;、RepresentThe trend that period interconnection is flowed into and exported;、For interconnection output and input power maximum, minimum limit value;Represent unitMaximum of exerting oneself.
(c)Transregional transaction transprovincially and Generation Rights Trade constraint:Power system security constraints
Exerting oneself by exchange hour mean allocation unit after electricity is drawn.
(3)Large user's direct power supply transaction output distribution
The target of large user's direct power supply transaction is the operation conditions according to power network, maximizes possible large user's direct-furnish transaction electricity, i.e.,
In formula: For large user direct-furnish purchaserAnd sellerThe electricity of conclusion of the business;The set of electricity side is sold to participate in large user's direct-furnish;The set of electricity side is bought in participate in large user's direct-furnish transaction.
Above-mentioned target need to consider power system security constraints:
Exerting oneself by exchange hour mean allocation unit after electricity is drawn.
Presently preferred embodiments of the present invention is the foregoing is only, all equivalent changes and modifications done according to scope of the present invention patent should all belong to the covering scope of the present invention.
Claims (5)
1. the acquisition methods of critical point power trade capacity index under a kind of polynary electrification structure, it is characterised in that comprise the following steps:
Step 1:Power network Back ground Information is provided, the power network Back ground Information includes essential information and real time information;
Step 2:Basis of business information is provided, the basis of business information includes " three is public " information, transprovincially transregional Transaction Information, Generation Rights Trade information and large user's direct-furnish power information;
Step 3:The specific time to be calculated is selected, that is, calculates day, discontinuity surface, the information of discontinuity surface when having 96 when the day was one with 15 minutes;
Step 4:Several trade varieties in four trade varieties or four trade varieties according to corresponding to the basis of business information set computation sequence, and four trade varieties are respectively:" three is public " scheduling, transprovincially transregional transaction, Generation Rights Trade and the transaction of large user's direct power supply;
Step 5:Calculated as follows day with reference to calculating according to computation sequence:
Step 51:The setting of object function is carried out, to maximize the remaining trading capacity in critical point as target, object function is set:
In formula:The trading capacity at critical point is represented, as all operating units of power network can be sent to the trend sum at critical point;Critical point then refers to the outlet of this province electricity sent outside;
Step 52:The setting of constraints is carried out, constraints is set(2)With(3):
(3)
In formula:、Represent respectivelyThe actual trend and maximum allowable trend of branch road; ForThe EIAJ of platform generating set,The sum of actually exerting oneself distributed for unit in four trade varieties,Represent thePlatform unit is exerted oneself;
Step 53:According to above-mentioned object function and constraints, the calculating of critical point trading capacity is carried out using simplex method, show that critical point maximum sends trading capacity outside and each unit sends trading capacity outside.
2. the acquisition methods of critical point power trade capacity index under polynary electrification structure according to claim 1, it is characterised in that:Described essential information, that is, the information not changed over time includes generator, transformer, the basic parameter of circuit, power plant's Contract generation, moon load prediction information, " three is public " essential information;The real time information be then according to when discontinuity surface is different and the size of for example each node load of information for changing, the state of transformer and non-standard no-load voltage ratio, circuit put into operation state.
3. the acquisition methods of critical point power trade capacity index under polynary electrification structure according to claim 1, it is characterised in that:Generating set output distribution in described " three is public " scheduling is drawn using following algorithm:
Determine object function:Deviation is minimum each other for the deviation of i.e. each train unit yearly plan generated energy and Contract generation;
In formula:、、、Is represented respectivelyIndividual train unit is from the plan generated energy in plan day to the end of the year, from the beginning of the year to plan day completed actual power generation, the Contract generation in the whole year, the deviation for planning electricity and Contract generation;For from plan day to the end of the year when hop count;ForIndividual train unit existsThe plan of period is exerted oneself;To participate in the train unit set of " three is public " scheduling;For the Period Length of plan;
Above-mentioned object function includes following constraints:
(a)System balancing is constrained:
1)Generating Constraints of Equilibrium
2)System fading margin Reserve Constraint
3)System spinning reserve is constrained
In formula:、、Respectively systemLoad, regulation stand-by requirement amount and the spinning reserve demand of period;For unit number of units;、For unitThe regulation spare capacity and spinning reserve capacity that can be provided;
(b)Plan the constraint of electricity maximum deviation:
In formula:、Is represented respectivelyThe maximum deviation of the deviation of individual train unit plan electricity and Contract generation, plan electricity and Contract generation;
(c)Unit operation is constrained:
1)Unit output bound is constrained
2)The operation of unit minimum is constrained with downtime duration
3)Unit follow load ability
4)Unit adjusts Reserve Constraint
5)Unit spinning reserve is constrained
6)Unit Commitment count constraint
7) constraint must be opened and must stopped to unit
8)Unit firm output is constrained
9)Machine group exert oneself bound constraint
During the above is various:、、、Unit is represented respectivelyExert oneself maximum and minimum value, machine groupExert oneself maximum and minimum value;IfRepresent unit Period is in open state, ifRepresent unit Period is in stopped status;、Unit is represented respectively The start duration of period and downtime duration;、Unit is represented respectivelyThe minimum start duration and minimum downtime duration;、Unit in a period is represented respectivelyDrop exert oneself speed with emersion power speed;For unit Whether the period has start, and value is 1 if start, is otherwise 0;For unitAllow the number of times of start from plan day to the end of the year;、、Expression must start shooting group set, group set and a firm output unit set must be shut down;ForPlatform unit existsThe firm output of period;For machine groupThe number of units of middle unit,For the title of machine group;
(d)Power system security constraints
4. the acquisition methods of critical point power trade capacity index under polynary electrification structure according to claim 1, it is characterised in that:Exerting oneself for the Generation Rights Trade and transprovincially transregional transaction is drawn using following algorithm:
Determine object function:
Transprovincially the object function of transregional transaction is that both parties' benefit and social utility are maximized, i.e.,
In formula:,For the quotation of power purchase side and sale of electricity side;The electricity struck a bargain for purchase seller;The set of electricity side is sold to participate in transregional transaction transprovincially;The set of electricity side is bought in participate in transregional transaction transprovincially;
The object function of Generation Rights Trade maximizes for social utility, i.e.,
In formula:、The respectively quotation of Generation Right transferor and assignee;The electricity struck a bargain for transferor and assignee;To participate in Generation Rights Trade transferor set;To participate in Generation Rights Trade assignee set;
Above-mentioned object function includes following constraints:
(a)Transregional transaction constraint transprovincially:Interregional interconnection transmission line capability
In above formula、RepresentThe trend that period interconnection is flowed into and exported;、For interconnection output and input power maximum, minimum limit value;
(b)Transregional transaction constraint transprovincially:One's respective area system restriction
1)Generating Constraints of Equilibrium
2)System fading margin Reserve Constraint
3)System spinning reserve is constrained
In above formula:、、Respectively systemLoad, regulation stand-by requirement and the spinning reserve demand of period;For the number of units of unit;、For unitThe regulation spare capacity and spinning reserve capacity that can be provided;、RepresentThe trend that period interconnection is flowed into and exported;、For interconnection output and input power maximum, minimum limit value;Represent unitMaximum of exerting oneself;
(c)Transregional transaction transprovincially and Generation Rights Trade constraint:Power system security constraints
Exerting oneself by exchange hour mean allocation unit after electricity is drawn.
5. the acquisition methods of critical point power trade capacity index under polynary electrification structure according to claim 1, it is characterised in that:Large user's direct power supply transaction is exerted oneself to be drawn using following algorithm:
The determination of object function:The target of large user's direct power supply transaction is the operation conditions according to power network, maximizes possible large user's direct-furnish transaction electricity, i.e.,
In formula: For large user direct-furnish purchaserAnd sellerThe electricity of conclusion of the business;The set of electricity side is sold to participate in large user's direct-furnish;The set of electricity side is bought in participate in large user's direct-furnish transaction;
Above-mentioned object function need to consider power system security constraints:
Exerting oneself by exchange hour mean allocation generating set after electricity is drawn.
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CN110135631A (en) * | 2019-04-26 | 2019-08-16 | 燕山大学 | Electrical integrated energy system dispatching method based on information gap decision theory |
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CN104951650A (en) * | 2015-05-28 | 2015-09-30 | 国网福建省电力有限公司 | Method for evaluating outer power transmission trading capacity of power exchange point of large-scale wind power grid |
CN110135631A (en) * | 2019-04-26 | 2019-08-16 | 燕山大学 | Electrical integrated energy system dispatching method based on information gap decision theory |
CN110135631B (en) * | 2019-04-26 | 2022-02-22 | 燕山大学 | Electric comprehensive energy system scheduling method based on information gap decision theory |
CN115760397A (en) * | 2022-11-14 | 2023-03-07 | 广西电网有限责任公司 | Electric power spot market clearing method, device, equipment and storage medium |
CN115760397B (en) * | 2022-11-14 | 2023-08-08 | 广西电网有限责任公司 | Method, device, equipment and storage medium for clearing electric power spot market |
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