CN114865662B - Thermoelectric unit power output control method and system for frequency modulation market - Google Patents

Thermoelectric unit power output control method and system for frequency modulation market Download PDF

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CN114865662B
CN114865662B CN202210788401.2A CN202210788401A CN114865662B CN 114865662 B CN114865662 B CN 114865662B CN 202210788401 A CN202210788401 A CN 202210788401A CN 114865662 B CN114865662 B CN 114865662B
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frequency modulation
thermoelectric
unit
thermoelectric unit
power
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CN114865662A (en
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陈新宇
金天昱
文劲宇
尚国政
郑婷婷
曹阳
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Huazhong University of Science and Technology
Electric Power Research Institute of State Grid Eastern Inner Mongolia Power Co Ltd
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Huazhong University of Science and Technology
Electric Power Research Institute of State Grid Eastern Inner Mongolia Power 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a thermoelectric unit power output control method and system for a frequency modulation market, belonging to the technical field of power control.A heat storage device is introduced to adjust the thermal output of a thermoelectric unit and provide a thermal output adjustment quantity for the thermoelectric unit so as to change the corresponding frequency modulation capacity of the thermoelectric unit in the frequency modulation market and establish a frequency modulation market optimization model; the process of solving the model is equal to searching towards the direction of increasing the corresponding frequency modulation capacity of the thermoelectric unit in the frequency modulation market in the feasible domain range of the operation of the thermoelectric unit so as to find the optimal thermal output adjustment quantity, thereby obtaining the optimal operation point of the thermoelectric unit in the frequency modulation market and obtaining the optimal power output of the thermoelectric unit. After the thermal demand is determined, the adjustable space is provided for the thermal output of the thermoelectric unit, the adjustable range of the power output is larger, the flexibility is higher, and the power fluctuation of the source side and the load side of the power system can be better adapted.

Description

Thermoelectric unit power output control method and system for frequency modulation market
Technical Field
The invention belongs to the technical field of power control, and particularly relates to a thermoelectric unit power output control method and system for the frequency modulation market.
Background
With the market transformation of the power industry, the power grid operator gradually no longer directly has the control right of most power frequency adjusting devices, but needs to acquire the control right in a marketable manner, namely, the frequency modulation market. The thermoelectric unit is used as a unit capable of supplying heat and power simultaneously, occupies an important position in the fields of electric power and heat power industries in China, and can participate in the competition of a frequency modulation market together with other units under the background of electric power marketization. With the participation of a large amount of renewable energy sources such as wind power, photovoltaic and the like in the power system, the influence of the volatility on the frequency of the power grid is more and more obvious, and the demand of the power system on the frequency modulation capacity is also obviously increased; in order to keep the frequency of the grid stable, it is necessary to extend the adjustable range of the power output level of the unit to accommodate power fluctuations on the source side and the load side of the power system. Therefore, the method for controlling the power output of the thermoelectric unit oriented to the frequency modulation market is of great significance.
However, in the existing method for controlling the power output of the thermoelectric power unit facing the frequency modulation market, as a main supplier of heat, the thermoelectric power unit primarily aims to meet the heat demand, and secondly adjusts the power output level to adapt to the power fluctuation on the source side and the load side of the power system.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a thermoelectric generator set power output control method and system oriented to the frequency modulation market, which are used for solving the technical problem that the adjustable range of the power output of a thermoelectric generator set is smaller in the prior art.
In order to achieve the above object, in a first aspect, the present invention provides a thermoelectric power generation unit power output control method for frequency modulation market, including:
inputting the maximum thermal output power and the maximum thermal storage power of the heat storage device and the thermal output of the thermoelectric unit at the current moment into a frequency modulation market optimization model for solving to obtain the optimal power output of the thermoelectric unit at the current moment;
the construction method of the frequency modulation market optimization model comprises the following steps:
s1, in a feasible region range of operation of the thermoelectric unit, based on the thermal output and thermal storage characteristics of the heat storage device, adjusting the thermal output of the thermoelectric unit to obtain the electric power output of the corresponding thermoelectric unit, and further obtaining the upper frequency modulation capacity and the lower frequency modulation capacity of the thermoelectric unit in the frequency modulation market;
s2, constructing a target function based on the power output of the thermoelectric unit and the upper frequency modulation capacity and the lower frequency modulation capacity corresponding to the thermoelectric unit in the frequency modulation market, so as to establish a frequency modulation market optimization model;
the objective function is:
Figure 723264DEST_PATH_IMAGE002
wherein T is a time domain;
Figure 672765DEST_PATH_IMAGE003
is composed oftOutputting the electric power of the thermoelectric generator set at any moment;
Figure 434048DEST_PATH_IMAGE004
is composed oftThe unit electric energy yield of the thermoelectric unit is obtained at any time;
Figure 510719DEST_PATH_IMAGE005
is composed oftThe corresponding upper frequency modulation capacity of the lower thermoelectric unit in the frequency modulation market at any moment;
Figure 939427DEST_PATH_IMAGE006
is composed oftThe lower frequency modulation capacity of the thermoelectric unit in the frequency modulation market at any moment;
Figure 325409DEST_PATH_IMAGE007
is composed oftThe unit frequency modulation capacity gain of the thermoelectric unit is realized at the moment;
Figure 839567DEST_PATH_IMAGE008
is a frequency modulation mileage ratio;
Figure 703617DEST_PATH_IMAGE009
is composed oftThe unit frequency modulation mileage income of the thermoelectric unit is obtained at the moment;
Figure 236099DEST_PATH_IMAGE010
is composed oftOutputting the heat of the thermoelectric unit at any time;
Figure 792982DEST_PATH_IMAGE011
the unit heat output cost of the thermoelectric unit is obtained;
Figure 794436DEST_PATH_IMAGE012
the unit power output cost of the thermoelectric power unit.
Further preferably, the feasible region for the operation of the thermoelectric power unit comprises: upper boundary A 1 B 1 Lower boundary A 2 B 2 Left boundary A 1 A 2 And a right boundary B 1 B 2 ；
Wherein, the upper boundary A 1 B 1 Representing an upper limit of the power output of the thermoelectric power unit; lower boundary A 2 B 2 Represents a lower limit of the power output of the thermoelectric power unit; left boundary A 1 A 2 Represents the lower limit of the thermal output of the thermoelectric unit; right border B 1 B 2 Representing the upper limit of the thermal output of the thermoelectric unit.
Further preferably, the upper boundary A 1 B 1 To the power output of
Figure 462178DEST_PATH_IMAGE013
The relationship to the thermal output Q is:
Figure 599898DEST_PATH_IMAGE014
lower boundary A 2 B 2 To the power output of
Figure 593262DEST_PATH_IMAGE015
The relationship to the thermal output Q is:
Figure 567165DEST_PATH_IMAGE016
wherein,
Figure 304177DEST_PATH_IMAGE017
is an upper boundary A 1 B 1 The slope of (a);
Figure 561983DEST_PATH_IMAGE018
is an upper boundary A 1 B 1 The intercept of (d);
Figure 460669DEST_PATH_IMAGE019
is a lower boundary A 2 B 2 The slope of (a);
Figure 436715DEST_PATH_IMAGE020
is a lower boundary A 2 B 2 The intercept of (c).
Further preferably, the thermoelectric power generation unit has a corresponding upper frequency modulation capacity in the frequency modulation market
Figure 711839DEST_PATH_IMAGE005
And the lower frequency-modulation capacity is:
Figure 824151DEST_PATH_IMAGE021
Figure 143006DEST_PATH_IMAGE022
Figure 340769DEST_PATH_IMAGE023
Figure 419584DEST_PATH_IMAGE024
wherein,
Figure 651982DEST_PATH_IMAGE025
is composed oftThe thermal output adjustment amount corresponding to the frequency modulation on the thermoelectric unit at any moment;
Figure 892470DEST_PATH_IMAGE026
is composed oftOutputting the adjustment quantity of the heat power corresponding to the time of frequency modulation under the thermoelectric unit at the moment;
Figure 843109DEST_PATH_IMAGE027
the maximum thermal output power of the heat storage device;
Figure 460035DEST_PATH_IMAGE028
storing power for a maximum thermal power of the heat storage device;
Figure 546940DEST_PATH_IMAGE027
and
Figure 709062DEST_PATH_IMAGE028
left boundary A between feasible regions of thermoelectric unit operation 1 A 2 And a right boundary B 1 B 2 In the meantime.
It is further preferred when
Figure 881417DEST_PATH_IMAGE017
And
Figure 36455DEST_PATH_IMAGE019
when the number of the positive lines is negative,
Figure 977866DEST_PATH_IMAGE025
and
Figure 825736DEST_PATH_IMAGE026
satisfies the following conditions:
Figure 485388DEST_PATH_IMAGE029
，
Figure 444117DEST_PATH_IMAGE030
。
when in use
Figure 754881DEST_PATH_IMAGE017
Is positive number, and
Figure 773653DEST_PATH_IMAGE019
when the number is negative, the number of the negative,
Figure 655021DEST_PATH_IMAGE025
and
Figure 151861DEST_PATH_IMAGE026
satisfies the following conditions:
Figure 67865DEST_PATH_IMAGE031
，
Figure 257538DEST_PATH_IMAGE030
。
further preferably, when
Figure 891781DEST_PATH_IMAGE017
Is negative, and
Figure 943045DEST_PATH_IMAGE019
when the number is positive, the number of the first and second groups is positive,
Figure 713555DEST_PATH_IMAGE025
and
Figure 74129DEST_PATH_IMAGE026
satisfies the following conditions:
Figure 664511DEST_PATH_IMAGE029
，
Figure 768733DEST_PATH_IMAGE032
。
further preferably, when
Figure 659328DEST_PATH_IMAGE017
And
Figure 190804DEST_PATH_IMAGE019
when the number of the positive lines is positive,
Figure 783328DEST_PATH_IMAGE025
and
Figure 160083DEST_PATH_IMAGE026
satisfies the following conditions:
Figure 905185DEST_PATH_IMAGE031
，
Figure 607562DEST_PATH_IMAGE032
。
in a second aspect, the present invention provides a thermoelectric power generation unit power output control system for frequency modulation market, including:
the model building module is used for adjusting the thermal output of the thermoelectric unit based on the thermal output and thermal storage characteristics of the heat storage device in the feasible operating domain range of the thermoelectric unit to obtain the electric power output of the corresponding thermoelectric unit, and further obtain the upper frequency modulation capacity and the lower frequency modulation capacity of the thermoelectric unit in the frequency modulation market; constructing a target function based on the power output of the thermoelectric unit and the upper frequency modulation capacity and the lower frequency modulation capacity corresponding to the thermoelectric unit in the frequency modulation market, so as to establish a frequency modulation market optimization model;
the power output control module is used for inputting the maximum thermal output power and the thermal storage power of the heat storage device and the thermal output of the thermoelectric unit at the current moment into the frequency modulation market optimization model for solving to obtain the optimal power output of the thermoelectric unit at the current moment;
the objective function is:
Figure 438114DEST_PATH_IMAGE033
wherein T is a time domain;
Figure 884139DEST_PATH_IMAGE003
is composed oftOutputting the electric power of the thermoelectric generator set at any moment;
Figure 749327DEST_PATH_IMAGE004
is composed oftThe unit electric energy yield of the thermoelectric unit is obtained at any time;
Figure 385056DEST_PATH_IMAGE005
is composed oftThe corresponding upper frequency modulation capacity of the lower thermoelectric unit in the frequency modulation market at any moment;
Figure 437326DEST_PATH_IMAGE006
is composed oftThe lower frequency modulation capacity of the thermoelectric unit in the frequency modulation market at any moment;
Figure 687042DEST_PATH_IMAGE007
is composed oftThe unit capacity gain of the thermoelectric unit is realized at any time;
Figure 406736DEST_PATH_IMAGE008
is a frequency modulation mileage ratio;
Figure 185336DEST_PATH_IMAGE009
is composed oftThe unit frequency modulation mileage income of the thermoelectric unit is obtained at the moment;
Figure 990481DEST_PATH_IMAGE010
is composed oftOutputting the heat of the thermoelectric unit at any moment;
Figure 512729DEST_PATH_IMAGE011
the unit heat output cost of the thermoelectric unit is obtained;
Figure 336198DEST_PATH_IMAGE012
the unit power output cost of the thermoelectric power unit.
In a third aspect, the present invention provides a thermoelectric power generation unit power output control system for frequency modulation market, including: the thermoelectric generating set power output control method for the frequency modulation market is implemented by the aid of the thermoelectric generating set power output control method provided by the first aspect of the invention when the computer program is executed by the processor.
In a fourth aspect, the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, where the computer program, when executed by a processor, controls a device in which the storage medium is located to execute the method for controlling power output of a thermoelectric generation unit facing a frequency modulation market, provided by the first aspect of the present invention.
Generally, by the above technical solution conceived by the present invention, the following beneficial effects can be obtained:
1. the invention provides a thermoelectric unit power output control method facing a frequency modulation market, which adjusts the thermal output of a thermoelectric unit by introducing a heat storage device, provides a thermal output adjustment amount for the thermoelectric unit, and changes the corresponding frequency modulation capacity of the thermoelectric unit in the frequency modulation market so as to establish a frequency modulation market optimization model; the process of solving the frequency modulation market optimization model is equal to searching towards the direction that the upper frequency modulation capacity and the lower frequency modulation capacity of the thermoelectric unit in the frequency modulation market are increased in the feasible domain range of the operation of the thermoelectric unit so as to find the optimal thermal output adjustment amount, and therefore the optimal operation point of the thermoelectric unit in the frequency modulation market is obtained, and the optimal power output of the thermoelectric unit is obtained. After the thermal demand is determined, the method provides an adjustable space for the thermal output of the thermoelectric unit, the adjustable range of the power output is large, the flexibility is high, and the method can be well adapted to the power fluctuation of the source side and the load side of the power system.
2. According to the thermoelectric unit power output control method for the frequency modulation market, the frequency modulation capacity can be adjusted by the thermal output adjustment amount provided by the energy storage device, so that the size of the frequency modulation capacity of the thermoelectric unit participating in the frequency modulation market can be flexibly adjusted, the frequency modulation capacity gain and the frequency modulation mileage gain which can be obtained by the thermoelectric unit participating in the frequency modulation market are improved, and further the total gain of the thermoelectric unit is improved.
Drawings
Fig. 1 is a schematic view of a feasible region of a thermoelectric power generation unit provided in embodiment 1 of the present invention.
FIG. 2 is a diagram provided in example 1 of the present invention
Figure 551278DEST_PATH_IMAGE017
And
Figure 843720DEST_PATH_IMAGE019
the feasible domain of the thermoelectric generator set and the frequency modulation capacity of the thermoelectric generator set are both negative numbers.
FIG. 3 is a diagram provided in example 1 of the present invention
Figure 169659DEST_PATH_IMAGE017
Is positive number, and
Figure 863945DEST_PATH_IMAGE019
the schematic diagram of the feasible domain of the thermoelectric generator set and the frequency modulation capacity of the thermoelectric generator set is negative.
FIG. 4 is a diagram provided in example 1 of the present invention
Figure 249927DEST_PATH_IMAGE017
Is negative, and
Figure 764085DEST_PATH_IMAGE019
the schematic diagram of the feasible domain of the thermoelectric generator set and the frequency modulation capacity of the thermoelectric generator set in positive number.
FIG. 5 is a block diagram provided in example 1 of the present invention
Figure 893715DEST_PATH_IMAGE017
And
Figure 193241DEST_PATH_IMAGE019
the feasible domains of the thermoelectric generator set and the frequency modulation capacity of the thermoelectric generator set are all positive numbers.
Fig. 6 is a comparison graph of frequency modulation capacity of the thermoelectric power unit in the frequency modulation market under the scenario one and the scenario two provided in embodiment 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
A thermoelectric unit power output control method for a frequency modulation market comprises the following steps:
to maximize the thermal output of the heat storage device
Figure 750124DEST_PATH_IMAGE027
And maximum thermal storage power
Figure 751578DEST_PATH_IMAGE028
And the thermal output of the thermoelectric unit at the current moment is input into a frequency modulation market optimization model for solving to obtain the optimal power output of the thermoelectric unit at the current moment;
specifically, the method for constructing the frequency modulation market optimization model comprises the following steps:
s1, in a feasible region range of operation of the thermoelectric unit, based on the thermal output and thermal storage characteristics of the heat storage device, adjusting the thermal output of the thermoelectric unit to obtain the electric power output of the corresponding thermoelectric unit, and further obtaining the upper frequency modulation capacity and the lower frequency modulation capacity of the thermoelectric unit in the frequency modulation market;
in particular, the thermoelectric power generation unit can simultaneously generate electric energy and thermal energy, and the feasible area of the thermoelectric power generation unit is generally quadrangular, as shown in fig. 1. A. the 1 B 1 And A 2 B 2 Respectively, the upper and lower boundaries of the feasible region, and A 1 A 2 And B 1 B 2 Left and right boundaries of the feasible region respectively; wherein, the upper boundary A 1 B 1 Representing an upper limit of the power output of the thermoelectric power unit; lower boundary A 2 B 2 Represents a lower limit of the power output of the thermoelectric power unit; left boundary A 1 A 2 Represents the lower limit of the thermal output of the thermoelectric unit; right border B 1 B 2 Representing the upper limit of the thermal output of the thermoelectric unit. Specifically, the upper boundary A 1 B 1 To the power output of
Figure 419320DEST_PATH_IMAGE013
The relationship to the thermal output Q is:
Figure 822619DEST_PATH_IMAGE014
lower boundary A 2 B 2 To the power output of
Figure 550404DEST_PATH_IMAGE015
The relationship to the thermal output Q is:
Figure 39154DEST_PATH_IMAGE016
wherein,
Figure 25433DEST_PATH_IMAGE017
is an upper boundary A 1 B 1 The slope of (a); is an upper boundary A 1 B 1 The intercept of (d);
Figure 283239DEST_PATH_IMAGE019
is a lower boundary A 2 B 2 The slope of (a);
Figure 181925DEST_PATH_IMAGE020
is a lower boundary A 2 B 2 The intercept of (2).
As shown in FIG. 1, intAt any moment, the operating point of the electric heating unit is
Figure 157971DEST_PATH_IMAGE034
Wherein, in the process,
Figure 433095DEST_PATH_IMAGE003
is composed oftOutputting the electric power of the thermoelectric generator set at any moment;
Figure 545407DEST_PATH_IMAGE010
is composed oftAnd outputting the heat of the thermoelectric unit at the moment. It should be noted that, since the thermal output curve of the thermoelectric power unit is generally determined by the thermal load prediction curve, the thermal output value thereof at any time is determined
Figure 880574DEST_PATH_IMAGE010
Is determined that the up-modulation capacity when participating in the frequency modulation market is only
Figure 563490DEST_PATH_IMAGE035
The lower frequency-modulation capacity is only
Figure 642305DEST_PATH_IMAGE036
And at this time, the up and down frequency regulation capacities are both fixed values. The heat storage device is a flexible device and can store and supply heat according to the requirement, so that when the thermoelectric unit and the heat storage device are operated cooperatively, the thermal output of the thermoelectric unit is determined by a determined value
Figure 609124DEST_PATH_IMAGE010
The method is expanded to a thermal output interval based on the thermal output and thermal storage characteristics of the heat storage device, and the optimal operation point of the electric heating unit in the frequency modulation market can be searched in the thermal output interval. Specifically, under the scene of cooperative operation of the thermoelectric unit and the heat storage device, the corresponding upper frequency modulation capacity of the thermoelectric unit in the frequency modulation market
Figure 115191DEST_PATH_IMAGE005
And lower frequency-modulation capacity
Figure 534671DEST_PATH_IMAGE006
Comprises the following steps:
Figure 151597DEST_PATH_IMAGE021
Figure 238502DEST_PATH_IMAGE022
Figure 164739DEST_PATH_IMAGE023
Figure 337094DEST_PATH_IMAGE024
wherein,
Figure 492132DEST_PATH_IMAGE025
is composed oftThe thermal output adjustment amount corresponding to the frequency modulation on the thermoelectric unit at any moment;
Figure 433543DEST_PATH_IMAGE026
is composed oftOutputting the adjustment quantity of the heat power corresponding to the time of frequency modulation under the thermoelectric unit at the moment;
Figure 281413DEST_PATH_IMAGE027
the maximum thermal output power of the heat storage device;
Figure 941065DEST_PATH_IMAGE028
storing power for a maximum thermal power of the heat storage device;
Figure 899794DEST_PATH_IMAGE027
and
Figure 712023DEST_PATH_IMAGE028
left boundary A between feasible regions 1 A 2 And a right boundary B 1 B 2 In the meantime.
Further, under the scene of the cooperative operation of the thermoelectric unit and the heat storage device:
when in use
Figure 465215DEST_PATH_IMAGE017
And
Figure 612163DEST_PATH_IMAGE019
the schematic diagram of the feasible domain of the thermoelectric generator set and the frequency modulation capacity thereof when both are negative numbers is shown in fig. 2, and at this time,
Figure 374583DEST_PATH_IMAGE025
and
Figure 290586DEST_PATH_IMAGE026
satisfy the requirements of
Figure 214680DEST_PATH_IMAGE029
，
Figure 583344DEST_PATH_IMAGE030
(ii) a The thermal output of the thermoelectric power unit is determined by a determined value
Figure 133143DEST_PATH_IMAGE010
Is extended to
Figure 169232DEST_PATH_IMAGE037
。
When in use
Figure 529806DEST_PATH_IMAGE017
Is positive number, and
Figure 385767DEST_PATH_IMAGE019
the schematic diagram of the feasible domain of the thermoelectric generator set and the frequency modulation capacity thereof in the case of negative number is shown in fig. 3, and at this time,
Figure 489989DEST_PATH_IMAGE025
and
Figure 380585DEST_PATH_IMAGE026
satisfies the following conditions:
Figure 912060DEST_PATH_IMAGE031
，
Figure 255317DEST_PATH_IMAGE030
(ii) a The thermal output of the thermoelectric power unit is determined by a determined value
Figure 382804DEST_PATH_IMAGE010
Extend to
Figure 127906DEST_PATH_IMAGE038
。
When in use
Figure 830283DEST_PATH_IMAGE017
Is negative, and
Figure 660836DEST_PATH_IMAGE019
the schematic diagram of the feasible domain of the thermoelectric generator set and the frequency modulation capacity thereof in positive number is shown in FIG. 4, and at this time
Figure 106860DEST_PATH_IMAGE025
And
Figure 440890DEST_PATH_IMAGE026
satisfies the following conditions:
Figure 563435DEST_PATH_IMAGE029
，
Figure 881284DEST_PATH_IMAGE032
(ii) a The thermal output of the thermoelectric power unit is determined by a determined value
Figure 131000DEST_PATH_IMAGE010
Is extended to
Figure 585115DEST_PATH_IMAGE039
。
When in use
Figure 629295DEST_PATH_IMAGE017
And
Figure 168860DEST_PATH_IMAGE019
the schematic diagram of the feasible domain of the thermoelectric generator set and the frequency modulation capacity thereof when the domains are positive numbers is shown in fig. 5, at this time,
Figure 956688DEST_PATH_IMAGE025
and
Figure 281621DEST_PATH_IMAGE026
satisfies the following conditions:
Figure 496702DEST_PATH_IMAGE031
，
Figure 789143DEST_PATH_IMAGE032
(ii) a Thermoelectric generator setIs determined by the determined value
Figure 115082DEST_PATH_IMAGE010
Is extended to
Figure 543789DEST_PATH_IMAGE037
。
The corresponding upper frequency modulation capacity and lower frequency modulation capacity of the recording thermoelectric unit in the frequency modulation market are respectively
Figure 195350DEST_PATH_IMAGE005
And
Figure 709508DEST_PATH_IMAGE006
as can be seen in conjunction with figures 2-5,
Figure 839138DEST_PATH_IMAGE005
is greater than
Figure 637199DEST_PATH_IMAGE035
，
Figure 194082DEST_PATH_IMAGE006
Is greater than
Figure 929957DEST_PATH_IMAGE036
The up and down frequency modulation capacity is improved; and the frequency modulation capacity can be adjusted by the thermal output adjustment amount provided based on the energy storage device, which is beneficial to flexibly adjusting the frequency modulation capacity of the thermoelectric unit participating in the frequency modulation market.
S2, constructing a target function based on the power output of the thermoelectric unit and the upper frequency modulation capacity and the lower frequency modulation capacity corresponding to the thermoelectric unit in the frequency modulation market, so as to establish a frequency modulation market optimization model;
the objective function is:
Figure 863278DEST_PATH_IMAGE041
wherein T is a time domain;
Figure 266577DEST_PATH_IMAGE003
is composed oftOutputting the electric power of the thermoelectric generator set at any moment;
Figure 994362DEST_PATH_IMAGE004
is composed oftThe unit electric energy yield of the thermoelectric unit is obtained at any time;
Figure 483112DEST_PATH_IMAGE005
is composed oftThe corresponding upper frequency modulation capacity of the lower thermoelectric unit in the frequency modulation market at any moment;
Figure 705277DEST_PATH_IMAGE006
is composed oftThe lower frequency modulation capacity of the thermoelectric unit in the frequency modulation market at any moment;
Figure 963083DEST_PATH_IMAGE007
is composed oftThe unit frequency modulation capacity gain of the thermoelectric unit is realized at the moment;
Figure 127348DEST_PATH_IMAGE008
is a frequency modulation mileage ratio;
Figure 103395DEST_PATH_IMAGE009
is composed oftThe unit frequency modulation mileage income of the thermoelectric unit is obtained at the moment;
Figure 112939DEST_PATH_IMAGE010
is composed oftOutputting the heat of the thermoelectric unit at any time;
Figure 490831DEST_PATH_IMAGE011
the unit heat output cost of the thermoelectric unit is obtained;
Figure 560418DEST_PATH_IMAGE012
the unit power output cost of the thermoelectric power unit. It should be noted that T here may be 24 hours, or may be a month or a year, and is determined according to actual requirements.
It should be noted that, in this embodiment, the objective function of the frequency modulation market optimization model corresponds to maximizing the total profit of the thermoelectric power unit, specifically: the method and the device have the advantages that the profit of the thermoelectric unit in the electric energy market, the frequency modulation capacity profit of the thermoelectric unit participating in the frequency modulation market, and the difference between the sum of the frequency modulation mileage profit of the thermoelectric unit participating in the frequency modulation market and the thermal power output cost of the thermoelectric unit are maximized.
When the model is solved, the corresponding upper frequency modulation capacity of the thermoelectric unit in the frequency modulation market is used
Figure 23760DEST_PATH_IMAGE005
And a lower frequency-modulation capacity
Figure 86263DEST_PATH_IMAGE006
Is brought into the above-mentioned objective function and
Figure DEST_PATH_IMAGE042
and
Figure DEST_PATH_IMAGE043
and solving the constraint condition, and finding out the optimal operating point of the thermoelectric unit by finding out the optimal thermal output adjustment quantity so as to obtain the optimal power output of the thermoelectric unit.
In order to further explain the beneficial effects of the thermoelectric unit power output control method for the frequency modulation market, detailed descriptions are given below by combining specific implementation cases:
a typical market clearing price curve of American PJM is selected and comprises an energy price curve, a frequency modulation capacity price curve and a frequency modulation mileage price curve, in a large system, the capacities of a single thermoelectric unit and a single heat storage device are negligible, and a marginal clearing price can be adopted as a settlement price when the thermoelectric unit and the heat storage device participate in the energy market and the frequency modulation market.
In the present embodiment, two simulation scenarios are set. In the first scenario, the thermoelectric unit is used as an independent individual to participate in the frequency modulation market, and the heat storage device is not considered when the power output control of the thermoelectric unit facing the frequency modulation market is carried out; in the second scenario, when the thermoelectric unit power output control facing the frequency modulation market is carried out, the thermoelectric unit and the heat storage device run cooperatively to jointly participate in the frequency modulation market. The remaining constraints are the same in both scenario one and scenario two.
The corresponding frequency modulation capacity of the thermoelectric generator set under the situation one and the situation two in the frequency modulation market is obtained through simulation analysis, and is shown in fig. 6; the frequency modulation capacity refers to the sum of the upper frequency modulation capacity and the lower frequency modulation capacity corresponding to the thermoelectric unit in the frequency modulation market. As can be seen from fig. 6, except that the two scenarios in the 5 th time period do not participate in the frequency modulation market, when the thermoelectric generator set power output control facing the frequency modulation market is performed in the other time periods, the frequency modulation capacities corresponding to the thermoelectric generator sets in the frequency modulation market in the second scenario are all greater than those in the first scenario. In the second scenario, the frequency modulation capacity corresponding to the heat motor set in the frequency modulation market is at most 61.46MW and at least 8.90MW, while in the first scenario, the frequency modulation capacity corresponding to the heat motor set in the frequency modulation market is at most 52.58MW and at least 0.01 MW; in all simulation time periods, the total amount of frequency modulation capacity corresponding to the thermoelectric generator set in the frequency modulation market in the scenario two is 257.15MW, and the total amount of frequency modulation capacity corresponding to the thermoelectric generator set in the frequency modulation market in the scenario one is 52.79MW, which is 20.5% of the scenario two. Therefore, the thermoelectric unit power output control method for the frequency modulation market can enable the thermoelectric unit to participate in the frequency modulation market, so that the frequency modulation capacity is high, and the power output adjustable range of the thermoelectric unit is large.
Further, table 1 shows the revenue components of the thermoelectric generator set and the heat storage device in all simulation periods in scenario one and scenario two, including cost, energy market revenue, frequency modulation capacity revenue, frequency modulation mileage revenue and total revenue.
TABLE 1
Cost/dollar Energy market revenue/dollar FM capacity gain/yuan FM mileage earnings/yuan Total profit/yuan
Situation one 1.95*10 5 6.48*10 5 7.49*10 3 59.93 4.60*10 5
Situation two 1.99*10 5 6.48*10 5 2.24*10 4 236.80 4.71*10 5
Amount of change +362 0 +1.49*10 3 +176.87 +1.15*10 3
As can be seen from table 1, the profit of scenario one and scenario two in the energy market are both 6.48 ten thousand yuan; in the frequency modulation market, the difference of the two scene profits is larger, the second scene increases 0.149 ten thousand yuan in the frequency modulation capacity benefit compared with the first scene, reaches 2.24 ten thousand yuan, and meanwhile, the frequency modulation mileage benefit also increases 176.87 yuan, reaches 236.8 yuan; the cost in scenario two is slightly increased, 362 yuan is increased compared with scenario one, and 1.99 ten thousand yuan is achieved. In the aspect of total income, the first scene is 4.6 ten thousand yuan, and the second scene is increased by 0.115 ten thousand yuan compared with the first scene, so that the total income reaches 4.71 ten thousand yuan. Therefore, under the thermoelectric unit power output control method facing the frequency modulation market, more frequency modulation market benefits are mined, the frequency modulation capacity benefits and the frequency modulation mileage benefits obtained by the thermoelectric unit in the frequency modulation market are higher, and the total benefits are also improved.
Example 2
A thermoelectric unit power output control system oriented to frequency modulation market comprises:
the model building module is used for adjusting the thermal output of the thermoelectric unit based on the thermal output and thermal storage characteristics of the heat storage device in the feasible operating domain range of the thermoelectric unit to obtain the electric power output of the corresponding thermoelectric unit, and further obtain the upper frequency modulation capacity and the lower frequency modulation capacity of the thermoelectric unit in the frequency modulation market; constructing a target function based on the power output of the thermoelectric unit and the upper frequency modulation capacity and the lower frequency modulation capacity corresponding to the thermoelectric unit in the frequency modulation market, so as to establish a frequency modulation market optimization model;
the power output control module is used for inputting the maximum thermal output power and the thermal storage power of the heat storage device and the thermal output of the thermoelectric unit at the current moment into the frequency modulation market optimization model for solving to obtain the optimal power output of the thermoelectric unit at the current moment;
the objective function is:
Figure DEST_PATH_IMAGE044
wherein T is a time domain;
Figure 256344DEST_PATH_IMAGE003
is composed oftOutputting the electric power of the thermoelectric generator set at any moment;
Figure 762412DEST_PATH_IMAGE004
is composed oftThe unit electric energy yield of the thermoelectric unit is obtained at any time;
Figure 447471DEST_PATH_IMAGE005
is composed oftThe corresponding upper frequency modulation capacity of the lower thermoelectric unit in the frequency modulation market at any moment;
Figure 815130DEST_PATH_IMAGE006
is composed oftThe lower frequency modulation capacity of the thermoelectric unit in the frequency modulation market at any moment;
Figure 902034DEST_PATH_IMAGE007
is composed oftThe unit capacity gain of the thermoelectric unit is realized at any time;
Figure 579003DEST_PATH_IMAGE008
is a frequency modulation mileage ratio;
Figure 751359DEST_PATH_IMAGE009
is composed oftThe unit frequency modulation mileage income of the thermoelectric unit is obtained at the moment;
Figure 906397DEST_PATH_IMAGE010
is composed oftOutputting the heat of the thermoelectric unit at any moment;
Figure 113387DEST_PATH_IMAGE011
the unit heat output cost of the thermoelectric unit is obtained;
Figure 961257DEST_PATH_IMAGE012
the unit power output cost of the thermoelectric power unit.
The related technical solution is the same as embodiment 1, and is not described herein.
Example 3
A thermoelectric unit power output control system oriented to frequency modulation market comprises: the thermoelectric generator set power output control method for the frequency modulation market provided by the embodiment 1 of the invention is executed when the computer program is executed by the processor.
The related technical scheme is the same as embodiment 1, and is not described herein.
Example 4
A computer-readable storage medium, which includes a stored computer program, wherein when the computer program is executed by a processor, the storage medium controls a device to execute the method for controlling the power output of the thermoelectric generation set facing the frequency modulation market, provided by embodiment 1 of the present invention.
The related technical scheme is the same as embodiment 1, and is not described herein.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A thermoelectric unit power output control method for the frequency modulation market is characterized by comprising the following steps: inputting the maximum thermal output power and the maximum thermal storage power of the heat storage device and the thermal output of the thermoelectric unit at the current moment into a frequency modulation market optimization model for solving to obtain the optimal power output of the thermoelectric unit at the current moment;
the method for constructing the market optimization model comprises the following steps:
s1, in a feasible region range of operation of the thermoelectric unit, based on the thermal output and thermal storage characteristics of the heat storage device, adjusting the thermal output of the thermoelectric unit to obtain the electric power output of the corresponding thermoelectric unit, and further obtaining the upper frequency modulation capacity and the lower frequency modulation capacity of the thermoelectric unit in the frequency modulation market;
s2, constructing an objective function based on the power output of the thermoelectric unit and the corresponding upper frequency modulation capacity and lower frequency modulation capacity of the thermoelectric unit in a frequency modulation market, and accordingly establishing the frequency modulation market optimization model;
the objective function is:
Figure 853048DEST_PATH_IMAGE001
wherein T is a time domain;
Figure 735684DEST_PATH_IMAGE002
is composed oftOutputting power of the thermoelectric generator set at any time;
Figure 90704DEST_PATH_IMAGE003
is composed oftThe unit electric energy yield of the thermoelectric unit is obtained at any time;
Figure 825311DEST_PATH_IMAGE004
is composed oftThe corresponding upper frequency modulation capacity of the lower thermoelectric unit in the frequency modulation market at any moment;
Figure 875351DEST_PATH_IMAGE005
is composed oftThe lower frequency modulation capacity of the thermoelectric unit in the frequency modulation market at any moment;
Figure 771632DEST_PATH_IMAGE006
is composed oftThe unit frequency modulation capacity gain of the thermoelectric unit is realized at the moment;
Figure 4161DEST_PATH_IMAGE007
is a frequency modulation mileage ratio;
Figure 512765DEST_PATH_IMAGE008
is composed oftThe unit frequency modulation mileage income of the thermoelectric unit is obtained at the moment;
Figure 989883DEST_PATH_IMAGE009
is composed oftOutputting the heat of the thermoelectric unit at any moment;
Figure 401273DEST_PATH_IMAGE010
the unit heat output cost of the thermoelectric unit;
Figure 527623DEST_PATH_IMAGE011
the unit power output cost of the thermoelectric power unit.
2. The method for controlling the power output of the thermoelectric power unit facing the frequency modulation market according to claim 1, wherein the feasible region for the operation of the thermoelectric power unit comprises: upper boundary A 1 B 1 Lower boundary A 2 B 2 Left boundary A 1 A 2 And a right boundary B 1 B 2 ；
Wherein the upper boundary A 1 B 1 Representing an upper limit of the power output of the thermoelectric power unit; the lower boundary A 2 B 2 Represents a lower limit of the power output of the thermoelectric power unit; the left boundary A 1 A 2 Represents the lower limit of the thermal output of the thermoelectric unit; the right boundary B 1 B 2 Representing the upper limit of the thermal output of the thermoelectric unit.
3. A method for controlling the power output of a thermoelectric generator set facing a frequency modulated market according to claim 2, wherein the upper boundary A is defined by 1 B 1 To the power output of
Figure 151502DEST_PATH_IMAGE012
The relationship to the thermal output Q is:
Figure 811023DEST_PATH_IMAGE013
the lower boundary A 2 B 2 To the power output of
Figure 488254DEST_PATH_IMAGE014
The relationship to the thermal output Q is:
Figure 616747DEST_PATH_IMAGE015
wherein,
Figure 28006DEST_PATH_IMAGE016
is the upper boundary A 1 B 1 The slope of (a);
Figure 823923DEST_PATH_IMAGE017
is the upper boundary A 1 B 1 The intercept of (d);
Figure 796690DEST_PATH_IMAGE018
is the lower boundary A 2 B 2 The slope of (a);
Figure 537113DEST_PATH_IMAGE019
is the lower boundary A 2 B 2 The intercept of (2).
4. The method for controlling the power output of the thermoelectric generating set facing the frequency modulation market according to claim 3, wherein the corresponding upper frequency modulation capacity of the thermoelectric generating set in the frequency modulation market
Figure 237215DEST_PATH_IMAGE004
And a lower frequency-modulation capacity
Figure 107213DEST_PATH_IMAGE005
Comprises the following steps:
Figure 765728DEST_PATH_IMAGE020
Figure 118081DEST_PATH_IMAGE021
Figure 621874DEST_PATH_IMAGE022
Figure 346379DEST_PATH_IMAGE023
wherein,
Figure 910215DEST_PATH_IMAGE024
is composed oftThe thermal output adjustment amount corresponding to the frequency modulation on the thermoelectric unit at any moment;
Figure 484285DEST_PATH_IMAGE025
is composed oftOutputting the adjustment quantity of the heat power corresponding to the time of frequency modulation under the thermoelectric unit at the moment;
Figure 695166DEST_PATH_IMAGE026
the maximum thermal output power of the heat storage device;
Figure 789024DEST_PATH_IMAGE027
storing power for a maximum thermal power of the heat storage device;
Figure 38609DEST_PATH_IMAGE026
and
Figure 585128DEST_PATH_IMAGE027
between the left boundary A 1 A 2 And the right boundary B 1 B 2 In the meantime.
5. A thermoelectric generating set power output control method oriented to frequency modulation market according to claim 4, characterized in that when the control method is applied, the control method is executed
Figure 712615DEST_PATH_IMAGE016
And
Figure 926559DEST_PATH_IMAGE018
when the number of the positive lines is negative,
Figure 81465DEST_PATH_IMAGE024
and
Figure 6958DEST_PATH_IMAGE025
satisfies the following conditions:
Figure 187404DEST_PATH_IMAGE028
，
Figure 177226DEST_PATH_IMAGE029
。
6. a thermoelectric generating set power output control method oriented to frequency modulation market according to claim 4, characterized in that when the control method is applied, the control method is executed
Figure 4498DEST_PATH_IMAGE016
Is positive number, and
Figure 181402DEST_PATH_IMAGE018
when the number is a negative number, the number is,
Figure 899959DEST_PATH_IMAGE024
and
Figure 511331DEST_PATH_IMAGE025
satisfies the following conditions:
Figure 211303DEST_PATH_IMAGE030
，
Figure 111388DEST_PATH_IMAGE029
。
7. a thermoelectric generating set power output control method oriented to frequency modulation market according to claim 4, characterized in that when the control method is applied, the control method is executed
Figure 882904DEST_PATH_IMAGE016
Is negative, and
Figure 660367DEST_PATH_IMAGE018
when the number is positive, the number of the first and second groups is positive,
Figure 829442DEST_PATH_IMAGE024
and
Figure 325146DEST_PATH_IMAGE025
satisfies the following conditions:
Figure 510139DEST_PATH_IMAGE028
，
Figure 892842DEST_PATH_IMAGE031
。
8. a thermoelectric generating set power output control method oriented to frequency modulation market according to claim 4, characterized in that when the control method is applied, the control method is executed
Figure 747665DEST_PATH_IMAGE016
And
Figure 979932DEST_PATH_IMAGE018
when the number of the positive lines is positive,
Figure 578404DEST_PATH_IMAGE024
and satisfies:
Figure 69473DEST_PATH_IMAGE030
，
Figure 95198DEST_PATH_IMAGE031
。
9. the utility model provides a thermoelectric unit power output control system towards frequency modulation market which characterized in that includes:
the model building module is used for adjusting the thermal output of the thermoelectric unit based on the thermal output and thermal storage characteristics of the heat storage device in the feasible operating domain range of the thermoelectric unit to obtain the electric power output of the corresponding thermoelectric unit, and further obtain the upper frequency modulation capacity and the lower frequency modulation capacity of the thermoelectric unit in the frequency modulation market; constructing a target function based on the power output of the thermoelectric unit and the upper frequency modulation capacity and the lower frequency modulation capacity corresponding to the thermoelectric unit in the frequency modulation market, so as to establish a frequency modulation market optimization model;
the power output control module is used for inputting the maximum thermal output power and the thermal storage power of the heat storage device and the thermal output of the thermoelectric unit at the current moment into the frequency modulation market optimization model for solving to obtain the optimal power output of the thermoelectric unit at the current moment;
the objective function is:
Figure 690127DEST_PATH_IMAGE001
wherein T is a time domain;
Figure 311863DEST_PATH_IMAGE002
is composed oftOutputting the electric power of the thermoelectric generator set at any moment;
Figure 918425DEST_PATH_IMAGE003
is composed oftThe unit electric energy yield of the thermoelectric unit is obtained at any time;
Figure 629898DEST_PATH_IMAGE004
is composed oftThe corresponding upper frequency modulation capacity of the lower thermoelectric unit in the frequency modulation market at any moment;
Figure 321911DEST_PATH_IMAGE005
is composed oftThe lower frequency modulation capacity of the thermoelectric unit in the frequency modulation market at any moment;
Figure 278497DEST_PATH_IMAGE006
is composed oftThe unit capacity gain of the thermoelectric unit is realized at any time;
Figure 739565DEST_PATH_IMAGE007
the frequency modulation mileage ratio is obtained;
Figure 90781DEST_PATH_IMAGE008
is composed oftThe unit frequency modulation mileage income of the thermoelectric unit is obtained at the moment;
Figure 161767DEST_PATH_IMAGE009
is composed oftOutputting the heat of the thermoelectric unit at any moment;
Figure 640153DEST_PATH_IMAGE010
the unit heat output cost of the thermoelectric unit is obtained;
Figure 470575DEST_PATH_IMAGE011
the unit power output cost of the thermoelectric power unit.
10. A computer-readable storage medium, comprising a stored computer program, wherein when the computer program is executed by a processor, the storage medium controls a device to execute the method for controlling power output of a thermoelectric power generation unit facing a frequency modulation market according to any one of claims 1 to 8.
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