CN111654020A - Method, system, device and storage medium for clearing current market of electric power in the day - Google Patents

Method, system, device and storage medium for clearing current market of electric power in the day Download PDF

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CN111654020A
CN111654020A CN202010437264.9A CN202010437264A CN111654020A CN 111654020 A CN111654020 A CN 111654020A CN 202010437264 A CN202010437264 A CN 202010437264A CN 111654020 A CN111654020 A CN 111654020A
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unit
constraint
standby
reserve
plan
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陈梓煜
和识之
林庆标
梁彦杰
刘起兴
赵玉柱
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China Southern Power Grid Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
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Abstract

The invention discloses a method, a system and a device for clearing a spot market of electric power in the day ahead and a storage medium. The method comprises the following steps: determining a unit startup combination through a safety constraint unit combination model, and obtaining a frequency modulation plan according to the unit startup combination and a frequency modulation market rule; determining a standby plan according to the standby capacity, the standby quotation and the safety constraint standby clearing model; and determining a generating plan of the unit according to the starting combination of the unit, the frequency modulation plan, the standby plan and the safety constraint economic dispatching model. According to the embodiment of the invention, the reserve capacity market which is relatively independent from the electric energy market and the frequency modulation market is constructed, the real-time condition of the reserve capacity is fully considered, and the reserve resources can be efficiently scheduled, so that a reasonable, reliable and high-performability power generation plan is obtained, the stable operation of a power system is ensured, the power generation efficiency of the power system is improved, and the method and the device can be widely applied to the technical field of the power market.

Description

Method, system, device and storage medium for clearing current market of electric power in the day
Technical Field
The invention relates to the technical field of power markets, in particular to a method, a system, a device and a storage medium for clearing a current power market in the day.
Background
The standby service is an indispensable important technical means for ensuring the reliability of the power system, and commercialization of the standby service is helpful for providing a new way for the system to acquire sufficient standby service. Due to the difference between the supply capacity and the cost of the service providers, it is feasible to introduce competition into the field of standby service, and a way of forming price by competition is introduced, which is helpful to stimulate the standby service providers to improve efficiency and carry out technical innovation. The establishment of the standby service market is helpful for the equipment owner to coordinate the provision of electric energy and the provision of standby service, and can make the opportunity cost, the operation cost, the service demand and the price changing with time and the like of the standby service clearer.
At present, the electric power market cannot realize the marketized transaction of the standby service, and usually only in the process of clearing the electric power spot market in the day ahead, the requirements of load standby, accident standby, rotation standby and power generation side standby are required according to the existing standby capacity management specification, and the requirements are used as constraint conditions to be embedded into a day-ahead electric power spot market clearing model (safety constraint unit combination and safety constraint economic dispatching) for calculation and compensation is carried out according to preset standards. The power generation plan obtained by the method does not consider the real-time condition of the spare capacity, so that the performability of the power generation plan is low, and the power generation efficiency of a power system is greatly limited.
In addition, with the large-scale development of renewable energy power generation, the demand of a power system on the standby service of a conventional power supply is increased, and whether the conventional power supply can provide enough standby service is crucial to the development of renewable energy power generation. Therefore, to ensure safe and reliable operation of the power system, the power system needs to reserve more spare capacity. How to efficiently schedule standby resources and complete a power generation plan which is reasonable, reliable and high in performability by clearing the current electric power market in the future becomes a problem to be solved urgently for developing renewable energy power generation on a large scale.
The noun explains:
electric power spot market: the general term of electric power trading activities before the next day, the day and the real-time scheduling is intensively developed by a trading mechanism in the day and in a shorter time;
the day-ahead electric spot market: the electric energy trading market is used for determining the combination state of the unit and the power generation plan on the operation day in advance by one day;
electric power market is clear: obtaining a unit combination state and a power generation plan through a clearing model;
safety restraint unit combination (SCUC): the on-off state combination of the generator set on the premise of ensuring the safe and stable operation of the power grid has relatively low requirements on a scheduling plan, and only needs to meet the requirements of the power grid safety and the balance of system supply and demand;
safety constrained economic Scheduling (SCED): on the basis of the determined unit combinations, a power generation plan is compiled that can be used to schedule the actual execution.
Disclosure of Invention
The present invention aims to solve at least to some extent one of the technical problems existing in the prior art.
Therefore, an object of an embodiment of the present invention is to provide a method for clearing a power spot market in the day ahead, which includes constructing a safety constraint backup clearing model to determine a backup plan meeting requirements on the basis of determining a unit combination through an SCUC model, and further determining a unit power generation plan through an SCED model on the basis. According to the method, the standby plan is obtained through the safety constraint standby output model, the real-time situation of the standby capacity is considered, and the standby resources can be efficiently scheduled, so that a reasonable, reliable and high-performability power generation plan is obtained, the power generation efficiency of the power system is improved, and the stable operation of the power system is ensured.
Another object of an embodiment of the present invention is to provide a system for clearing a power spot market in the day ahead.
In order to achieve the technical purpose, the technical scheme adopted by the embodiment of the invention comprises the following steps:
in a first aspect, an embodiment of the present invention provides a method for clearing a spot market of electric power in the day ahead, including the following steps:
acquiring planned electric quantity of a unit, planned price quotation of the unit, reserve capacity and reserve price quotation;
determining a unit startup combination according to the unit planned electric quantity, the unit planned quotation and a preset safety constraint unit combination model, and obtaining a frequency modulation plan according to the unit startup combination and a frequency modulation market rule;
determining a standby plan according to the standby capacity, the standby quotation and a preset safety constraint standby clearing model;
determining a unit power generation plan according to the unit starting combination, the frequency modulation plan, the standby plan and a preset safety constraint economic dispatching model;
the reserve capacity comprises a power generation side reserve capacity and a user side reserve capacity, and the reserve quotation comprises a power generation side reserve quotation and a user side reserve quotation.
Further, in an embodiment of the present invention, the safety constraint unit combination model includes a first objective function and a first constraint condition, which minimize a sum of the output operating cost and the startup cost of all the units, where the first constraint condition includes a first active power balance constraint, a first line power flow constraint, a first section power flow constraint, a first unit output upper and lower limit constraint, a first unit climbing constraint, a first unit minimum continuous startup and shutdown time constraint, and a unit maximum startup and shutdown time constraint.
Further, in one embodiment of the present invention, the first objective function is:
Figure BDA0002502751320000021
wherein N represents the total number of units, T represents the total time interval, Pi,tRepresenting the output of the unit i in time t, Ci,t(Pi,t) Representing the operating cost of the unit i during the time period t,
Figure BDA0002502751320000022
representing the starting cost of the unit i in the time period t, M representing the network flow constraint relaxation penalty factor,
Figure BDA0002502751320000023
representing the forward power flow relaxation variable of line i,
Figure BDA0002502751320000024
the reverse power flow relaxation variable of line i is represented, NL represents the total number of lines,
Figure BDA0002502751320000025
represents the forward power flow relaxation variable of the section s,
Figure BDA0002502751320000026
the reverse power flow relaxation variable of the section s is shown, and NS represents the total number of the sections.
Further, in an embodiment of the present invention, the safety constraint backup export model includes a second objective function and a second constraint condition for minimizing the backup capacity cost, where the second constraint condition includes a rotation backup constraint, an accident backup constraint, a power generation side accident backup constraint, a negative backup capacity constraint, a second unit output upper and lower limit constraint, and a second unit climbing constraint, and the second unit output upper and lower limit constraint is obtained by optimizing the first unit output upper and lower limit constraint according to the frequency modulation plan.
Further, in one embodiment of the present invention, the second objective function is
Figure BDA0002502751320000031
Wherein N represents the total number of the units which are determined to be started according to the unit starting combination, N represents the total number of the units, T represents the total time period, m represents the number of the cuttable loads which can provide non-rotating standby,
Figure BDA0002502751320000032
indicating a spinning reserve offer for unit i during time period t,
Figure BDA0002502751320000033
representing the non-rotating reserve quote for the unit i during time period t,
Figure BDA0002502751320000034
indicating a negative reserve offer, R, for unit i during time period ton,i,tIndicating the rotary standby bid-winning capacity R of the unit i in the time period toff,i,tRepresenting the non-rotating reserve bid-winning capacity, R, of the unit i in a time period tN,i,tAnd the negative standby bid-winning capacity of the unit i in the time period t is shown.
Further, in an embodiment of the present invention, the safety-constrained economic scheduling model includes a third objective function and a third constraint condition that minimize a sum of output operating costs and start-up costs of all units, where the third constraint condition includes a second active balance constraint, a second line power flow constraint, a second section power flow constraint, a third unit output upper and lower limit constraints, a third unit climbing constraint, and a second unit minimum continuous on-off time constraint, where the third unit output upper and lower limit constraints are obtained by optimizing the second unit output upper and lower limit constraints according to the standby plan.
Further, in an embodiment of the present invention, the third objective function is:
Figure BDA0002502751320000035
wherein N represents the total number of units, T represents the total time interval, Pi,tRepresenting the output of the unit i in time t, Ci,t(Pi,t) Representing the operating cost of the unit i during the time period t,
Figure BDA0002502751320000036
representing the starting cost of the unit i in the time period t, and M representing the loose constraint of the network flowThe relaxation-penalty factor is a function of,
Figure BDA0002502751320000037
representing the forward power flow relaxation variable of line i,
Figure BDA0002502751320000038
the reverse power flow relaxation variable of line i is represented, NL represents the total number of lines,
Figure BDA0002502751320000039
represents the forward power flow relaxation variable of the section s,
Figure BDA00025027513200000310
the reverse power flow relaxation variable of the section s is shown, and NS represents the total number of the sections.
In a second aspect, an embodiment of the present invention provides a system for clearing a spot market of electric power in the day ahead, including:
the acquisition module is used for acquiring the planned electric quantity of the unit, the planned quotation of the unit, the reserve capacity and the reserve quotation;
the unit startup combination and frequency modulation plan determining module is used for determining a unit startup combination according to the unit planned electric quantity, the unit planned quotation and a preset safety constraint unit combination model, and obtaining a frequency modulation plan according to the unit startup combination and a frequency modulation market rule;
the standby plan determining module is used for determining a standby plan according to the standby capacity, the standby quotation and a preset safety constraint standby clearing model;
the power generation plan determining module is used for determining a unit power generation plan according to the unit starting combination, the frequency modulation plan, the standby plan and a preset safety constraint economic dispatching model;
the reserve capacity comprises a power generation side reserve capacity and a user side reserve capacity, and the reserve quotation comprises a power generation side reserve quotation and a user side reserve quotation.
In a third aspect, an embodiment of the present invention provides a device for clearing a spot market of electric power in the day ahead, including:
at least one processor;
at least one memory for storing at least one program;
when executed by the at least one processor, cause the at least one processor to implement the one future power spot market clearing method.
In a fourth aspect, embodiments of the present invention further provide a computer-readable storage medium having stored therein processor-executable instructions, which when executed by a processor, are configured to perform a method for day-ahead power spot market clearing.
Advantages and benefits of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention:
according to the embodiment of the invention, on the basis of determining the unit combination through the SCUC model, the safety constraint standby output model is constructed to determine the standby plan meeting the requirements, and on the basis, the unit power generation plan is further determined through the SCED model. The embodiment of the invention obtains the standby plan through the safety constraint standby output model, fully considers the real-time situation of the standby capacity, and can efficiently schedule the standby resources, thereby obtaining a reasonable, reliable and high-performability power generation plan, improving the power generation efficiency of the power system, providing enough standby capacity and ensuring the safe and reliable operation of the power system.
Drawings
In order to more clearly illustrate the technical solution in the embodiment of the present invention, the following description is made on the drawings required to be used in the embodiment of the present invention, and it should be understood that the drawings in the following description are only for convenience and clarity of describing some embodiments in the technical solution of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for clearing a current electric power spot market according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a system for clearing a current electric power spot market according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a present electric power spot market clearing device in the embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention. The step numbers in the following embodiments are provided only for convenience of illustration, the order between the steps is not limited at all, and the execution order of each step in the embodiments can be adapted according to the understanding of those skilled in the art.
In the description of the present invention, the meaning of a plurality is two or more, if there is a description to the first and the second for the purpose of distinguishing technical features, it is not understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features. Furthermore, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art.
Referring to fig. 1, an embodiment of the present invention provides a method for clearing a spot market of electric power in the day ahead, including the following steps:
s101, acquiring planned electric quantity of a unit, planned quotation of the unit, reserve capacity and reserve quotation;
the reserve capacity comprises a power generation side reserve capacity and a user side reserve capacity, and the reserve quotation comprises a power generation side reserve quotation and a user side reserve quotation.
Specifically, in the market bid declaring phase, the market body submits an electric energy quote, a rotational reserve capacity quote, a non-rotational capacity quote, and a negative reserve quote, respectively. Wherein, all generator sets submit the quantity and price information of the power generation plan, namely the planned electric quantity of the generator set and the planned quotation of the generator set; market bodies on a power generation side and a user side provide spare capacity quotation information meeting conditions according to the requirements of rotating spare and non-rotating spare of the current standard on the premise of not exceeding the capacity of a unit and load regulation.
In the embodiment of the invention, the unit plan quotation comprises the unit operation cost and the unit starting cost; the generating side reserve capacity comprises a rotating reserve capacity, a negative reserve capacity and a generating side non-rotating reserve capacity, and the generating side reserve price corresponds to the capacity cost of the capacities respectively; the user side reserve capacity comprises user side non-rotating reserve capacity, and the user side reserve price corresponds to the capacity cost. See table 1 for details:
Figure BDA0002502751320000051
Figure BDA0002502751320000061
TABLE 1
S102, determining a unit startup combination according to unit planned electric quantity, unit planned quotation and a preset safety constraint unit combination model, and obtaining a frequency modulation plan according to the unit startup combination and a frequency modulation market rule;
specifically, on the basis of the unit planned electric quantity and the unit planned quotation of the generator set, the unit combination is determined through a safety constraint unit combination model, and the reserve capacity constraint is temporarily not considered; and then clearing is finished according to the frequency modulation market rule to obtain a day-ahead prearranged result of the frequency modulation market, and the upper limit and the lower limit of the output force of the winning set in each time interval can be adjusted for the first time so as to optimize the boundary condition of a subsequent safety constraint standby clearing model.
As a further optional implementation manner, the safety constraint unit combination model includes a first objective function and a first constraint condition, where the first objective function minimizes a sum of output running cost and starting cost of all units, and the first constraint condition includes a first active power balance constraint, a first line power flow constraint, a first section power flow constraint, a first unit output upper and lower limit constraint, a first unit climbing constraint, a first unit minimum continuous start-up and shut-down time constraint, and a unit maximum start-up and shut-down times constraint.
As a further alternative, the first objective function is;
Figure BDA0002502751320000062
specifically, N represents the total number of units, including units participating in the market and units not participating in the market; t represents the total number of time periods, and 96 time periods are considered every day in the embodiment of the invention, namely T is 96; pi,tRepresenting the output of the unit i in the time t; ci,t(Pi,t) Representing the operating cost of the unit i during the time period t,
Figure BDA0002502751320000063
representing the starting cost of the unit i in the time period t; m represents a network flow constraint relaxation penalty factor;
Figure BDA0002502751320000064
representing the forward power flow relaxation variable of line i,
Figure BDA0002502751320000065
representing the reverse power flow relaxation variable of the line l, and NL representing the total number of lines;
Figure BDA0002502751320000066
represents the forward power flow relaxation variable of the section s,
Figure BDA0002502751320000067
the reverse power flow relaxation variable of the section s is shown, and NS represents the total number of the sections.
Optionally, the first active balance constraint is that the sum of all the unit outputs is equal to the generator aperture uniform load. The first active balance constraint may be described as:
Figure BDA0002502751320000068
wherein, Pi,tRepresents the output of the unit i in the time period T, Tj,tRepresents the planned power of the tie j (positive input and negative output) over time period t, NT represents the total number of ties, DtRepresenting the system load for time period t.
Optionally, the first line flow constraint is that the line flow does not exceed a maximum transmission capacity. The first line flow constraint may be described as:
Figure BDA0002502751320000071
wherein, Pl maxRepresenting the limit of power flow transmission of the line l; gl-iRepresenting a generator output power transfer distribution factor of a line l by a node where a unit i is located; gl-jRepresenting the generator output power transfer distribution factor of the node where the tie line j is located to the line l; k represents the number of nodes of the system; gl-kRepresenting the generator output power transfer distribution factor of node k to line l; dk,tRepresents the bus load value of the node k in the time period t;
Figure BDA0002502751320000072
respectively representing the positive and reverse power flow relaxation variables of the line.
Optionally, the first profile flow constraint is that the profile flow does not exceed a maximum transmission capacity. The first profile flow constraint may be described as:
Figure BDA0002502751320000073
wherein, Ps min、Ps maxRespectively representing a minimum value and a maximum value of a tidal current transmission limit of the section s; gs-iRepresenting the generator output power transfer distribution factor of the section s of the node where the unit i is located; gs-jRepresenting the generator output power transfer distribution factor of the section s of the node where the tie line j is located; gs-kRepresenting the output power transfer distribution factor of the generator of the node k to the section s;
Figure BDA0002502751320000074
Figure BDA0002502751320000075
respectively representing the positive and reverse power flow relaxation variables of the line.
Optionally, the first unit output upper and lower limits are constrained such that the output of the unit should be within its maximum/minimum output range. The first set of upper and lower force limits constraints may be described as:
Figure BDA0002502751320000076
wherein, αi,tRepresenting the start-stop status of the unit i during a time period t, αi,t0 indicates a unit shutdown, αi,t1 represents the starting of the unit;
Figure BDA0002502751320000077
the maximum output and the minimum output of the unit i in the time period t are respectively.
Optionally, the first unit hill climbing constraint is: when the unit climbs up or down, the requirement of climbing speed is met. The first set of hill climbing constraints may be described as:
Figure BDA0002502751320000078
Figure BDA0002502751320000079
wherein, Δ Pi URepresenting the maximum rate of ascent, Δ P, of the unit ii DRepresenting the maximum ramp down rate of unit i.
Optionally, the first set of minimum continuous on-off time constraints are: due to the physical properties and actual operation requirements of the thermal power generating unit, the thermal power generating unit is required to meet minimum continuous startup/shutdown time. The first team minimum continuous on-off time constraint may be described as:
Figure BDA0002502751320000081
Figure BDA0002502751320000082
wherein, αi,tShowing the start-stop state of the unit i in a time period T, TU、TDRespectively representing the minimum continuous starting time and the minimum continuous stopping time of the unit,
Figure BDA0002502751320000083
respectively representing the time that the unit i has been continuously turned on and the continuous off time in the time period t,
Figure BDA0002502751320000084
the state variable α may be usedi,t(i is 1 to N, and T is 1 to T) as follows:
Figure BDA0002502751320000085
Figure BDA0002502751320000086
optionally, the constraint on the maximum number of start-stops of the first unit may be described as:
definitions ηi,tWhether the unit i is switched to a starting state in a time period t or not is judged; gamma rayi,tThe definition indicates whether the unit i is switched to the shutdown state in the time period t. The following conditions are satisfied:
Figure BDA0002502751320000087
Figure BDA0002502751320000088
the limitation of the number of start-stop times of the corresponding unit i can be expressed as follows:
Figure BDA0002502751320000089
Figure BDA00025027513200000810
optionally, the upper and lower limits of the output force of the winning machine set in each time interval are adjusted for the first time as follows:
Figure BDA00025027513200000811
Figure BDA00025027513200000812
wherein,
Figure BDA00025027513200000813
respectively representing the maximum output and the minimum output of the unit i after the first adjustment in the time t, and being used for calculating a subsequent safety constraint standby output model;
Figure BDA0002502751320000091
and (4) indicating that the unit i can pre-output the clearing and winning capacity in the frequency modulation market at the time t.
S103, determining a standby plan according to the standby capacity, the standby quotation and a preset safety constraint standby clearing model;
specifically, based on reserve capacity quoted prices submitted by market bodies at a power generation side and a user side, various kinds of reserve capacity configuration are completed through concentrated bidding and clearing according to the requirements of the current reserve capacity standard, wherein the rotary reserve and the negative reserve are only selected from the unit which is determined to be started through the unit starting combination. By solving the safety constraint standby clearing model, the plans of rotating standby, non-rotating standby and negative standby provided by the power generation side/user side at each time interval of the next day and the market marginal prices of the rotating standby, the non-rotating standby and the negative standby are determined, and meanwhile, the upper and lower output limits of the bid unit at each time interval can be adjusted on the basis of the second time so as to optimize the boundary conditions of the subsequent safety constraint economic dispatching model.
Further as an optional implementation manner, the safety constraint spare clearing model includes a second objective function and a second constraint condition that minimize the spare capacity cost, and the second constraint condition includes a rotation spare constraint, an accident spare constraint, a power generation side accident spare constraint, a negative spare capacity constraint, a second unit output upper and lower limit constraint and a second unit climbing constraint, where the second unit output upper and lower limit constraint is obtained by optimizing the first unit output upper and lower limit constraint according to the frequency modulation plan.
Further as an alternative embodiment, the second objective function is
Figure BDA0002502751320000092
Specifically, N represents the total number of the units determined to be started according to the unit starting combination, N represents the total number of the units, T represents the total time period, m represents the number of the cuttable loads capable of providing non-rotating standby,
Figure BDA0002502751320000093
indicating a spinning reserve offer for unit i during time period t,
Figure BDA0002502751320000094
representing the non-rotating reserve quote for the unit i during time period t,
Figure BDA0002502751320000095
indicating a negative reserve offer, R, for unit i during time period ton,i,tIndicating the rotary standby bid-winning capacity R of the unit i in the time period toff,i,tRepresenting the non-rotating reserve bid-winning capacity, R, of the unit i in a time period tN,i,tAnd the negative standby bid-winning capacity of the unit i in the time period t is shown.
Optionally, the rotational standby constraint is: the spinning reserve capacity is the spinning reserve factor time interval load. The rotational standby constraint can be described as:
Figure BDA0002502751320000096
η denotes a systemRotating stand-by factor, DtRepresenting the system load for time period t.
Optionally, the contingency reserve constraint is: the total capacity of the emergency reserve (rotating reserve + non-rotating reserve-load reserve) is 10% by time period of maximum load. The contingency reserve constraint can be described as:
Figure BDA0002502751320000101
wherein R isD,j,tLoad reserve capacity provided for user j during time period t; MaxD (maximum numerical data interchange) methodtIs the maximum system load for time period t.
Optionally, the power generation side contingency reserve constraint is: the capacity of the power generation side for spare power in case of accident (rotating spare + non-rotating spare-load spare provided by the power generation side) is the maximum active deficit caused by single simple fault or shared channel fault. The power generation side contingency reserve constraints can be described as:
Figure BDA0002502751320000102
wherein, max ΔtThe maximum active deficit caused by a single simple fault or the shared fault of an input channel in the time period t is obtained.
Optionally, the negative spare capacity constraint is: for each time period t, the negative spare capacity that can be provided by each unit in the system needs to meet the negative spare capacity requirement of the system. The negative spare capacity constraint may be described as:
Figure BDA0002502751320000103
wherein R isN,tRepresenting the negative standby demand capacity of the system during time period t.
Optionally, the upper and lower limits of the second unit output power are constrained as follows: the sum of the output and the positive reserve capacity of the units participating in the electric energy, frequency modulation and reserve markets needs to meet the output upper limit constraint of the units, and the difference between the output and the negative reserve capacity needs to meet the output lower limit constraint of the units. The second unit output upper and lower limit constraints can be described as:
Figure BDA0002502751320000104
Figure BDA0002502751320000105
αi,trepresenting the start-stop status of the unit i during a time period t, αi,t0 indicates a unit shutdown, αi,t1 represents the starting of the unit;
Figure BDA0002502751320000106
Figure BDA0002502751320000107
the maximum output and the minimum output of the unit i adjusted according to the frequency modulation market pre-clearing result after the adjustment at the time t are respectively.
Optionally, the second unit hill climbing constraint is: when the unit climbs up or down, the requirement of climbing speed is met. The second unit hill climbing constraint may be described as:
Figure BDA0002502751320000108
Figure BDA0002502751320000109
wherein, Δ Pi UFor the unit i maximum climbing rate, Δ Pi DThe maximum downward climbing rate of the unit i.
Optionally, the upper and lower limits of the bid amount of the winning machine set in each time interval are adjusted for the second time as follows:
Figure BDA0002502751320000111
Figure BDA0002502751320000112
wherein,
Figure BDA0002502751320000113
the maximum output and the minimum output of the unit i after the second adjustment in the time t are respectively represented, and the maximum output and the minimum output can be used for calculation of a subsequent safety constraint economic dispatching model.
And S104, determining a generating plan of the unit according to the unit starting combination, the frequency modulation plan, the standby plan and a preset safety constraint economic dispatching model.
Specifically, based on the information of the electric quantity quotation information of the generator set, the starting combination of the generator set, the frequency modulation plan, the standby plan and the like, the power generation plan of the generator set is determined through the safety constraint economic dispatching model, the information of power generation, frequency modulation, standby and the like in each hour of the next day is obtained, and meanwhile the price of the day-ahead electric energy market can be obtained.
Further as an optional implementation manner, the safety constraint economic dispatching model includes a third objective function and a third constraint condition that minimize the sum of the output running cost and the starting cost of all the units, and the third constraint condition includes a second active power balance constraint, a second line power flow constraint, a second section power flow constraint, a third unit output upper and lower limit constraint, a third unit climbing constraint and a second unit minimum continuous on-off time constraint, where the third unit output upper and lower limit constraint is obtained by optimizing the second unit output upper and lower limit constraint according to a standby plan.
As a further optional implementation, the third objective function is:
Figure BDA0002502751320000114
specifically, N represents the total number of units, T represents the total time interval, and P representsi,tRepresenting the output of the unit i in time t, Ci,t(Pi,t) Representing the operating cost of the unit i during the time period t,
Figure BDA0002502751320000115
representing the starting cost of the unit i in the time period t, M representing the network flow constraint relaxation penalty factor,
Figure BDA0002502751320000116
representing the forward power flow relaxation variable of line i,
Figure BDA0002502751320000117
the reverse power flow relaxation variable of line i is represented, NL represents the total number of lines,
Figure BDA0002502751320000118
represents the forward power flow relaxation variable of the section s,
Figure BDA0002502751320000119
the reverse power flow relaxation variable of the section s is shown, and NS represents the total number of the sections.
In the embodiment of the present invention, the second active balance constraint may adopt the same constraint condition as the first active balance constraint, the second line power flow constraint may adopt the same constraint condition as the first line power flow constraint, the second section power flow constraint may adopt the same constraint condition as the first line power flow constraint, and the second unit minimum continuous start-stop time constraint may adopt the same constraint condition as the first unit minimum exercise start-stop time constraint, which is not described herein again.
Optionally, the upper and lower limits of the third unit output power are constrained as follows: the capacity of the unit should be within its maximum/minimum capacity range. The third unit output upper and lower limit constraints can be described as:
Figure BDA0002502751320000121
wherein, αi,tRepresenting the start-stop status of the unit i during a time period t, αi,t0 indicates a unit shutdown, αi,t1 represents the starting of the unit;
Figure BDA0002502751320000122
respectively representing the maximum output and the minimum output of the unit i after the second adjustment in the time t.
Optionally, the third unit hill climbing constraint is: when the unit climbs up or down, the requirement of climbing speed is met. The third unit hill climbing constraint may be described as:
Figure BDA0002502751320000123
Figure BDA0002502751320000124
wherein, Δ Pi URepresenting the maximum rate of ascent, Δ P, of the unit ii DRepresenting the maximum ramp down rate of unit i.
It should be understood that the method embodiments of the present invention are not limited to the implementation of the above equations.
On the basis of determining the unit combination through the SCUC model, the embodiment of the invention constructs a safety constraint standby output model to organize relatively independent standby capacity market transaction, determines a standby plan meeting the requirements, and further determines a unit power generation plan through the SCED model on the basis. By constructing a reserve capacity market which is relatively independent from an electric energy market and a frequency modulation market, the real-time condition of the reserve capacity is fully considered, and reserve resources can be efficiently scheduled, so that a reasonable, reliable and high-performability power generation plan is obtained, the stable operation of a power system is ensured, and the power generation efficiency of the power system is improved; the upper and lower limit constraints of the output of the unit are adjusted and optimized twice, so that the obtained standby plan and the power generation plan are more convenient to execute, and the stable operation of the power system is further ensured.
Referring to fig. 2, an embodiment of the present invention provides a system for clearing a spot market of electric power in the day ahead, including:
the acquisition module is used for acquiring the planned electric quantity of the unit, the planned quotation of the unit, the reserve capacity and the reserve quotation;
the unit startup combination and frequency modulation plan determining module is used for determining a unit startup combination according to the unit planned electric quantity, the unit planned quotation and the safety constraint unit combination model, and obtaining a frequency modulation plan according to the unit startup combination and the frequency modulation market rule;
the standby plan determining module is used for determining a standby plan according to the standby capacity, the standby quotation and the safety constraint standby clearing model;
the generating plan determining module is used for determining a generating plan of the unit according to the unit starting combination, the frequency modulation plan, the standby plan and the safety constraint economic dispatching model;
the reserve capacity comprises power generation side reserve capacity and user side reserve capacity, and the reserve quotation comprises power generation side reserve quotation and user side reserve quotation.
The contents in the above method embodiments are all applicable to the present system embodiment, the functions specifically implemented by the present system embodiment are the same as those in the above method embodiment, and the beneficial effects achieved by the present system embodiment are also the same as those achieved by the above method embodiment.
Referring to fig. 3, an embodiment of the present invention provides a device for clearing a spot market of electric power in the day ahead, including:
at least one processor;
at least one memory for storing at least one program;
when the at least one program is executed by the at least one processor, the at least one program causes the at least one processor to implement the method for day-ahead power spot market clearing.
The contents in the above method embodiments are all applicable to the present apparatus embodiment, the functions specifically implemented by the present apparatus embodiment are the same as those in the above method embodiments, and the advantageous effects achieved by the present apparatus embodiment are also the same as those achieved by the above method embodiments.
Embodiments of the present invention also provide a computer-readable storage medium having stored therein processor-executable instructions, which when executed by a processor, are configured to perform a method of day-ahead power spot market clearing.
The computer-readable storage medium of the embodiment of the invention can execute the method for clearing the spot market of the electric power in the day before provided by the embodiment of the method of the invention, can execute any combination of the implementation steps of the embodiment of the method, and has corresponding functions and beneficial effects of the method.
In alternative embodiments, the functions/acts noted in the block diagrams may occur out of the order noted in the operational illustrations. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality/acts involved. Furthermore, the embodiments presented and described in the flow charts of the present invention are provided by way of example in order to provide a more thorough understanding of the technology. The disclosed methods are not limited to the operations and logic flows presented herein. Alternative embodiments are contemplated in which the order of various operations is changed and in which sub-operations described as part of larger operations are performed independently.
Furthermore, although the present invention is described in the context of functional modules, it should be understood that, unless otherwise stated to the contrary, one or more of the above-described functions and/or features may be integrated in a single physical device and/or software module, or one or more of the functions and/or features may be implemented in a separate physical device or software module. It will also be appreciated that a detailed discussion of the actual implementation of each module is not necessary for an understanding of the present invention. Rather, the actual implementation of the various functional modules in the apparatus disclosed herein will be understood within the ordinary skill of an engineer, given the nature, function, and internal relationship of the modules. Accordingly, those skilled in the art can, using ordinary skill, practice the invention as set forth in the claims without undue experimentation. It is also to be understood that the specific concepts disclosed are merely illustrative of and not intended to limit the scope of the invention, which is defined by the appended claims and their full scope of equivalents.
The above functions, if implemented in the form of software functional units and sold or used as a separate product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the above method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Further, the computer readable medium could even be paper or another suitable medium upon which the above described program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the foregoing description of the specification, reference to the description of "one embodiment/example," "another embodiment/example," or "certain embodiments/examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A method for clearing a spot market of electric power in the day ahead is characterized by comprising the following steps:
acquiring planned electric quantity of a unit, planned price quotation of the unit, reserve capacity and reserve price quotation;
determining a unit startup combination according to the unit planned electric quantity, the unit planned quotation and a preset safety constraint unit combination model, and obtaining a frequency modulation plan according to the unit startup combination and a frequency modulation market rule;
determining a standby plan according to the standby capacity, the standby quotation and a preset safety constraint standby clearing model;
determining a unit power generation plan according to the unit starting combination, the frequency modulation plan, the standby plan and a preset safety constraint economic dispatching model;
the reserve capacity comprises a power generation side reserve capacity and a user side reserve capacity, and the reserve quotation comprises a power generation side reserve quotation and a user side reserve quotation.
2. The method of claim 1, wherein the method comprises the steps of:
the safety constraint unit combination model comprises a first objective function and a first constraint condition, wherein the first objective function and the first constraint condition minimize the sum of the output running cost and the starting cost of all units, and the first constraint condition comprises a first active power balance constraint, a first line flow constraint, a first section flow constraint, a first unit output upper and lower limit constraint, a first unit climbing constraint, a first unit minimum continuous start-up and shut-down time constraint and a unit maximum start-up and shut-down times constraint.
3. The method of claim 2, wherein the first objective function is:
Figure FDA0002502751310000011
wherein N represents the total number of units, T represents the total time interval, Pi,tRepresenting the output of the unit i in time t, Ci,t(Pi,t) Representing the operating cost of the unit i during the time period t,
Figure FDA0002502751310000012
representing the starting cost of the unit i in the time period t, M representing the network flow constraint relaxation penalty factor,
Figure FDA0002502751310000013
representing the forward power flow relaxation variable of line i,
Figure FDA0002502751310000014
the reverse power flow relaxation variable of line i is represented, NL represents the total number of lines,
Figure FDA0002502751310000015
represents the forward power flow relaxation variable of the section s,
Figure FDA0002502751310000016
the reverse power flow relaxation variable of the section s is shown, and NS represents the total number of the sections.
4. The method of claim 2, wherein the method comprises the steps of:
the safety constraint spare clearing model comprises a second objective function and a second constraint condition which minimize spare capacity cost, wherein the second constraint condition comprises a rotation spare constraint, an accident spare constraint, a power generation side accident spare constraint, a negative spare capacity constraint, a second unit output upper and lower limit constraint and a second unit climbing constraint, and the second unit output upper and lower limit constraint is obtained by optimizing the first unit output upper and lower limit constraint according to the frequency modulation plan.
5. The method of claim 4, wherein the second objective function is
Figure FDA0002502751310000021
Wherein N represents the total number of the units which are determined to be started according to the unit starting combination, N represents the total number of the units, T represents the total time period, m represents the number of the cuttable loads which can provide non-rotating standby,
Figure FDA0002502751310000022
indicating a spinning reserve offer for unit i during time period t,
Figure FDA0002502751310000023
representing the non-rotating reserve quote for the unit i during time period t,
Figure FDA0002502751310000024
indicating a negative reserve offer, R, for unit i during time period ton,i,tIndicating the rotary standby bid-winning capacity R of the unit i in the time period toff,i,tRepresenting the non-rotating reserve bid-winning capacity, R, of the unit i in a time period tN,i,tAnd the negative standby bid-winning capacity of the unit i in the time period t is shown.
6. The method of claim 4, wherein the method comprises the steps of:
the safety constraint economic dispatching model comprises a third objective function and a third constraint condition which minimize the sum of the output running cost and the starting cost of all the units, wherein the third constraint condition comprises a second active balance constraint, a second line power flow constraint, a second section power flow constraint, a third unit output upper and lower limit constraint, a third unit climbing constraint and a second unit minimum continuous start-up and shut-down time constraint, and the third unit output upper and lower limit constraint is obtained by optimizing the second unit output upper and lower limit constraint according to the standby plan.
7. The method of claim 6, wherein the third objective function is:
Figure FDA0002502751310000025
wherein N represents the total number of units, T represents the total time interval, Pi,tRepresenting the output of the unit i in time t, Ci,t(Pi,t) Representing the operating cost of the unit i during the time period t,
Figure FDA0002502751310000026
representing the starting cost of the unit i in the time period t, M representing the network flow constraint relaxation penalty factor,
Figure FDA0002502751310000027
representing the forward power flow relaxation variable of line i,
Figure FDA0002502751310000028
the reverse power flow relaxation variable of line i is represented, NL represents the total number of lines,
Figure FDA0002502751310000029
represents the forward power flow relaxation variable of the section s,
Figure FDA00025027513100000210
the reverse power flow relaxation variable of the section s is shown, and NS represents the total number of the sections.
8. A day-ahead power spot market clearing system, comprising:
the acquisition module is used for acquiring the planned electric quantity of the unit, the planned quotation of the unit, the reserve capacity and the reserve quotation;
the unit startup combination and frequency modulation plan determining module is used for determining a unit startup combination according to the unit planned electric quantity, the unit planned quotation and a preset safety constraint unit combination model, and obtaining a frequency modulation plan according to the unit startup combination and a frequency modulation market rule;
the standby plan determining module is used for determining a standby plan according to the standby capacity, the standby quotation and a preset safety constraint standby clearing model;
the power generation plan determining module is used for determining a unit power generation plan according to the unit starting combination, the frequency modulation plan, the standby plan and a preset safety constraint economic dispatching model;
the reserve capacity comprises a power generation side reserve capacity and a user side reserve capacity, and the reserve quotation comprises a power generation side reserve quotation and a user side reserve quotation.
9. A day-ahead power spot market clearing device, comprising:
at least one processor;
at least one memory for storing at least one program;
when executed by the at least one processor, cause the at least one processor to implement a method of day-ahead power spot market clearing as claimed in any one of claims 1-7.
10. A computer readable storage medium having stored therein processor executable instructions, which when executed by a processor, is for performing a method of day-ahead power spot market clearing as claimed in any one of claims 1-7.
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CN115049431A (en) * 2022-06-10 2022-09-13 国网湖北省电力有限公司 Pricing method of water and electricity in electric power spot market
CN116579801A (en) * 2023-07-13 2023-08-11 中能智新科技产业发展有限公司 Electric power clearing method and device based on double-layer iteration and related equipment
CN116579801B (en) * 2023-07-13 2024-01-26 中能智新科技产业发展有限公司 Electric power clearing method and device based on double-layer iteration and related equipment

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