CN112984594A - Method and device for determining minimum output of coal-fired heat supply unit in heat supply period - Google Patents

Method and device for determining minimum output of coal-fired heat supply unit in heat supply period Download PDF

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CN112984594A
CN112984594A CN202110296009.1A CN202110296009A CN112984594A CN 112984594 A CN112984594 A CN 112984594A CN 202110296009 A CN202110296009 A CN 202110296009A CN 112984594 A CN112984594 A CN 112984594A
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heat supply
load
power grid
regional power
coal
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CN112984594B (en
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刘双白
张晶
吴昕
胡娱欧
张涛
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State Grid Corp of China SGCC
North China Electric Power Research Institute Co Ltd
North China Grid Co Ltd
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State Grid Corp of China SGCC
North China Electric Power Research Institute Co Ltd
North China Grid Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/06—Solid fuel fired boiler
    • F24D2200/062—Coal fired boilers
    • 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
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/14—Combined heat and power generation [CHP]

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a method and a device for determining minimum output of a coal-fired heat supply unit in a heat supply period, wherein the method comprises the following steps: determining the thermoelectric relationship of each coal-fired heat supply unit according to the heat supply operation modes and the thermoelectric relationship of a plurality of coal-fired heat supply units in the regional power grid; determining the maximum heat supply capacity of each coal-fired heat supply unit under each electric load working condition according to the thermoelectric relationship of each coal-fired heat supply unit; determining the unit load of each coal-fired heat supply unit and the upper and lower limits of the unit load under the working condition of the maximum heat supply capacity; determining a heat supply load interval of each coal-fired heat supply unit; and determining the minimum output of the regional power grid in the heat supply period according to the unit load of each coal-fired heat supply unit under the working condition of the maximum heat supply capacity and the heat supply demand load of the regional power grid by taking the upper limit and the lower limit of the unit load and the heat supply load interval as constraint conditions. The invention can determine the minimum output of the coal-fired heat supply unit in the heat supply period, guide the production operation of the regional power grid and enhance the peak regulation capability.

Description

Method and device for determining minimum output of coal-fired heat supply unit in heat supply period
Technical Field
The invention relates to the technical field of electric power, in particular to a method and a device for determining minimum output of a coal-fired heat supply unit in a heat supply period.
Background
This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
Most power stations in northern areas of China are cogeneration units, and the power stations run in a mode of fixing power by heat in winter heat supply. Along with the change of urban heat supply from a heating boiler mode to a cogeneration heat supply mode, the heat load of a heat supply unit is increased year by year, the electric load is increased, the peak regulation capacity of the heat supply unit is reduced, and the problems of difficult peak regulation of a power grid, insufficient new energy consumption capacity and the like are further caused. The heat supply capacity and the peak regulation capacity of the unit in the heat supply period are improved due to various heat supply flexibility improvements in recent years. For regional power grid power supervision departments and production operation departments, the minimum output of each heat supply unit needs to be carefully determined, a production plan in a heat supply period is made, the peak regulation potential of the regional power grid is effectively excavated on the basis of guaranteeing heat supply in winter, and the peak regulation capacity of the units in the grid is released to the maximum extent.
At present, no clear and uniform method for determining the minimum output of the coal-fired heat supply unit in the heat supply period exists.
Disclosure of Invention
The embodiment of the invention provides a method for determining the minimum output of a coal-fired heat supply unit in a heat supply period, which is used for determining the minimum output of the coal-fired heat supply unit in the heat supply period of a regional power grid and comprises the following steps:
determining the thermoelectric relationship of each coal-fired heat supply unit according to the heat supply operation modes and the thermoelectric relationship of a plurality of coal-fired heat supply units in the regional power grid;
determining the maximum heat supply capacity of each coal-fired heat supply unit under each electric load working condition according to the thermoelectric relationship of each coal-fired heat supply unit;
determining the unit load of each coal-fired heat supply unit under the working condition of the maximum heat supply capacity and the upper and lower limits of the unit load of each coal-fired heat supply unit under the working condition of the maximum heat supply capacity according to the maximum heat supply capacity of each coal-fired heat supply unit under the working condition of each electric load;
determining a heat supply load interval of each coal-fired heat supply unit according to the thermoelectric relationship of each coal-fired heat supply unit;
and determining the minimum output of the regional power grid in the heat supply period according to the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the heat supply demand load of the regional power grid by taking the upper limit and the lower limit of the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the heat supply load interval of each coal-fired heat supply unit as constraint conditions.
In another embodiment of the present invention, a minimum output determination apparatus for a heating period of a coal-fired heat supply unit is further provided, which is configured to determine a minimum output of the coal-fired heat supply unit during the heating period of a regional power grid, and includes:
the thermoelectric relationship determining module is used for determining the thermoelectric relationship of each coal-fired heat supply unit according to the heat supply operation modes and the thermoelectric relationship of a plurality of coal-fired heat supply units in the regional power grid;
the heat supply capacity determining module is used for determining the maximum heat supply capacity of each coal-fired heat supply unit under each electric load working condition according to the thermoelectric relationship of each coal-fired heat supply unit;
the unit load determining module is used for determining the unit load of each coal-fired heat supply unit under the working condition of the maximum heat supply capacity and the upper and lower limits of the unit load of each coal-fired heat supply unit under the working condition of the maximum heat supply capacity according to the maximum heat supply capacity of each coal-fired heat supply unit under the working condition of each electric load;
the heat supply load determining module is used for determining a heat supply load interval of each coal-fired heat supply unit according to the thermoelectric relationship of each coal-fired heat supply unit;
and the minimum output determining module is used for determining the minimum output of the regional power grid in the heat supply period according to the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the heat supply demand load of the regional power grid by taking the upper limit and the lower limit of the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the heat supply load interval of each coal-fired heat supply unit as constraint conditions.
The embodiment of the invention also provides computer equipment for determining the minimum output of the coal-fired heat supply unit in the heat supply period, which comprises a memory, a processor and a computer program which is stored on the memory and can be operated on the processor, wherein the processor realizes the method for determining the minimum output of the coal-fired heat supply unit in the heat supply period when executing the computer program.
The embodiment of the invention also provides a computer readable storage medium for determining the minimum output of the coal-fired heat supply unit in the heat supply period, and the computer readable storage medium stores a computer program for executing the method for determining the minimum output of the coal-fired heat supply unit in the heat supply period.
In the embodiment of the invention, the thermoelectric relationship of each coal-fired heat supply unit is determined according to the heat supply operation modes and the thermoelectric relationship of a plurality of coal-fired heat supply units in a regional power grid; determining the maximum heat supply capacity of each coal-fired heat supply unit under each electric load working condition according to the thermoelectric relationship of each coal-fired heat supply unit; determining the unit load of each coal-fired heat supply unit under the working condition of the maximum heat supply capacity and the upper and lower limits of the unit load of each coal-fired heat supply unit under the working condition of the maximum heat supply capacity according to the maximum heat supply capacity of each coal-fired heat supply unit under the working condition of each electric load; determining a heat supply load interval of each coal-fired heat supply unit according to the thermoelectric relationship of each coal-fired heat supply unit; determining the minimum output of a regional power grid in a heating period according to the unit load of each coal-fired heat supply unit under the maximum heating capacity working condition and the heating demand load of the regional power grid by taking the upper limit and the lower limit of the unit load of each coal-fired heat supply unit under the maximum heating capacity working condition and the heating load interval of each coal-fired heat supply unit as constraint conditions; at present, no clear method for determining the minimum output of the coal-fired heat supply unit in the heat supply period exists in the prior art, and the embodiment of the invention can be used for determining the minimum output of the coal-fired heat supply unit in the heat supply period of the regional power grid, thereby providing guidance for the production operation of the regional power grid and enhancing the peak regulation capacity of the regional power grid.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:
FIG. 1 is a process flow diagram of a method for determining a minimum output during a heating period of a coal-fired heating unit according to an embodiment of the present invention;
FIG. 2 is a flowchart of an embodiment of a method for determining a minimum output at the beginning and end of heating of a coal-fired heat supply unit according to the present invention;
FIG. 3 is a flowchart of an embodiment of a method for determining a minimum output during a medium heating period of a coal-fired heat supply unit according to the present invention;
FIG. 4 is a schematic structural diagram of a minimum output determination device in the heating period of a coal-fired heating unit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a computer device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
FIG. 1 is a processing flow chart of a method for determining the minimum output during the heating period of a coal-fired heating unit according to an embodiment of the invention. As shown in fig. 1, the method for determining the minimum output during the heating period of the coal-fired heating unit according to the embodiment of the present invention may include:
step 101, determining the thermoelectric relationship of each coal-fired heat supply unit according to the heat supply operation modes and the thermoelectric relationship of a plurality of coal-fired heat supply units in a regional power grid;
102, determining the maximum heat supply capacity of each coal-fired heat supply unit under each electric load working condition according to the thermoelectric relationship of each coal-fired heat supply unit;
103, determining the unit load of each coal-fired heat supply unit under the working condition of the maximum heat supply capacity and the upper and lower limits of the unit load of each coal-fired heat supply unit under the working condition of the maximum heat supply capacity according to the maximum heat supply capacity of each coal-fired heat supply unit under the working condition of each electric load;
104, determining a heat supply load interval of each coal-fired heat supply unit according to the thermoelectric relationship of each coal-fired heat supply unit;
and 105, determining the minimum output of the regional power grid in the heat supply period according to the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the heat supply demand load of the regional power grid by taking the upper limit and the lower limit of the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the heat supply load interval of each coal-fired heat supply unit as constraint conditions.
As can be known from the process shown in fig. 1, the method for determining the minimum output of the coal-fired heat supply unit during the heat supply period in the embodiment of the present invention determines the minimum output of the local grid during the heat supply period according to the unit load of each coal-fired heat supply unit under the maximum heat supply capacity condition and the heat supply demand load of the local grid, with the upper and lower limits of the unit load of each coal-fired heat supply unit under the maximum heat supply capacity condition and the heat supply load interval of each coal-fired heat supply unit as constraint conditions; at present, no clear and uniform method for determining the minimum output of the coal-fired heat supply unit in the heat supply period exists in the prior art, and the embodiment of the invention can be used for determining the minimum output of the coal-fired heat supply unit in the heat supply period of the regional power grid, thereby providing guidance for the production operation of the regional power grid and enhancing the peak regulation capacity of the regional power grid.
When the method is specifically implemented, the thermoelectric relationship of each coal-fired heat supply unit is determined according to the heat supply operation modes and the thermoelectric relationship of a plurality of coal-fired heat supply units in a regional power grid. In one embodiment, the thermoelectric relationship may be represented in the form of a thermoelectric relationship curve, or may be represented in other ways, such as a data table. Determining the thermoelectric relationship of each coal-fired heating unit may be, for example: and determining the thermoelectric relation curve of each coal-fired heat supply unit according to the heat supply operation modes and the thermoelectric relation curves of a plurality of coal-fired heat supply units in the regional power grid.
In an embodiment, the heat supply operation modes and the thermoelectric relationship curves of the multiple coal-fired heat supply units in the regional power grid may be obtained by collecting relevant data in the regional power grid, where the relevant data may include, for example: the system comprises a normal heat supply operation mode of a regional power grid, heat supply reconstruction design data, a turbine heat calculation book, a heat supply unit thermoelectric relation curve, boiler minimum stable combustion design data and a test report, a relevant daily report of unit heating or industrial steam extraction in the previous heating period and the like, and can also refer to a heat supply approval document, a power plant external heat supply contract, a previous heating period heat supply contract and settlement certificate, an industrial steam extraction contract and settlement certificate, a newly added heat supply area approval document and the like provided by a government department during implementation.
And constructing a thermoelectric relation curve of each coal-fired heat supply unit based on the heat supply operation modes and thermoelectric relation curves of a plurality of coal-fired heat supply units in the regional power grid, and constructing a new thermoelectric relation curve for the units subjected to heat supply reconstruction according to heat supply reconstruction design data.
After determining the thermoelectric relationship curve of each coal-fired heat supply unit, determining the maximum heat supply capacity of each coal-fired heat supply unit under each electric load working condition according to the thermoelectric relationship curve of each coal-fired heat supply unit, wherein the maximum heat supply capacity of each coal-fired heat supply unit under each electric load working condition can be as follows: and for each coal-fired heat supply unit, searching the maximum heat supply capacity of the coal-fired heat supply unit under each electric load working condition on a thermoelectric relation curve of the coal-fired heat supply unit.
After the maximum heat supply capacity of each coal-fired heat supply unit under each electric load working condition is determined, the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the upper and lower limits of the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition are determined according to the maximum heat supply capacity of each coal-fired heat supply unit under each electric load working condition.
During specific implementation, according to the maximum heat supply capacity of each coal-fired heat supply unit under each electric load working condition, the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition is determined to be as follows: according to the maximum heat supply capacity of each coal-fired heat supply unit under each electric load working condition, fitting to obtain a thermoelectric function relation of the maximum heat supply capacity of each coal-fired heat supply unit:
pi＝gi(qi)
wherein p isiThe load of a No. i unit of the regional power grid is obtained; giFor the maximum heating capacity thermoelectric function, q, of the regional power grid unit No. iiAnd supplying heat load to the I-number unit of the regional power grid.
According to the maximum heat supply capacity of each coal-fired heat supply unit under each electric load working condition, determining the upper and lower limits of the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition to be as follows: based on the related data in the regional power grid and the maximum heat supply capacity thermoelectric function relation, solving the upper and lower unit load limits of each coal-fired heat supply unit under the maximum heat supply capacity working condition:
pi,min≤pi≤pi,max
wherein p isi,minThe lower limit of the load of the I-number unit of the regional power grid is set; p is a radical ofi,maxAnd the load upper limit of the I-number unit of the regional power grid is obtained.
According to the thermoelectric relation curve of each coal-fired heat supply unit, the heat supply load interval of each coal-fired heat supply unit can be determined, and the heat supply load interval can be, for example:
0≤qi≤qi,max
wherein q isiFor regional grid No. i unit heating load, qi,maxAnd supplying heat load upper limit to the I-number unit of the regional power grid.
And determining the minimum output of the regional power grid in the heat supply period according to the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the heat supply demand load of the regional power grid by taking the obtained upper and lower limits of the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the heat supply load interval of each coal-fired heat supply unit as constraint conditions.
In specific implementation, the minimum output of the regional power grid in the initial stage and the final stage of heat supply and the middle stage of heat supply can be respectively determined. In the embodiment, the heat supply staging can be processed according to the actual heat supply condition of the coal-fired heat supply unit in the regional power grid, for example, 15 days before and 15 days after the heat supply period can be used as the initial stage of heat supply, and the other dates except the initial stage of heat supply in the heat supply period can be used as the middle stage of heat supply, but the heat supply staging range protected by the embodiment of the invention is not limited to the illustrated example, and for example, different values such as 5 days, 10 days, 20 days and the like can be selected according to the actual heat supply condition to perform heat supply staging.
In specific implementation, the minimum output of the regional power grid in the initial stage and the final stage of heat supply and the minimum output of the regional power grid in the middle stage of heat supply can be respectively determined. The minimum output is specifically divided into peak-regulation minimum output and guarantee minimum output, and the peak-regulation minimum output refers to the minimum unit load which can be produced by a regional power grid under the condition that a heat supply unit in the regional power grid meets external heat supply; the guaranteed minimum output means the minimum unit load which can be produced by the regional power grid under the condition of satisfying external heat supply when the number of the regional power grid operation units is 1 more than that of the peak shaving type minimum output mode.
In the embodiment, the peak shaving type minimum output of the regional power grid in the initial and final stages of heating can be determined according to the following formula:
pi＝gi(qi)
pi,min≤pi≤pi,max
0≤qi≤qi,max
∑qi＝qt,c
minpt,ct
wherein p isiThe load of a No. i unit of the regional power grid is obtained; giThe number i machine set of regional power gridA large heating capacity thermoelectric function; q. q.siSupplying heat load to a regional power grid No. i unit; p is a radical ofi,minThe method comprises the following steps of 1, setting a load lower limit of a No. i unit in a regional power grid; p is a radical ofi,maxThe load upper limit of the No. i unit in the regional power grid is set; q. q.si,maxProviding an upper limit of heat supply load for the No. i unit in the regional power grid; q. q.st,cThe method comprises the steps of providing a heat supply demand load of an area power grid in the initial and final stage of heat supply, wherein the heat supply demand load is the average heat supply load of the area power grid in the previous initial and final stage of heat supply; p is a radical oft,ctThe peak shaving type minimum output of the regional power grid in the initial and final stages of heating is realized.
In the embodiment, if the number of the units participating in heat supply obtained in the peak shaving type minimum output calculation is smaller than the total number of the units in the regional power grid, the regional power grid can complete heat supply requirements under the condition that part of the units are started. And for the regional power grid, the guaranteed minimum output calculation is continuously carried out.
For example, the number N of units participating in heat supply in peak shaving type minimum output calculation of regional power grid in the initial and final stages of heat supplyctAnd if the total number of the units is less than the total number of the units, determining the guaranteed minimum output of the regional power grid in the initial and final stages of heat supply according to the following formula:
pi＝gi(qi)
pi,min≤pi≤pi,max
0≤qi≤qi,max
Figure BDA0002983977620000071
minpt,cb
the number of units participating in heat supply in the guaranteed minimum output calculation of the regional power grid in the initial and final stages of heat supply is Nct+1，pt,cbThe method provides the minimum guaranteed output of the regional power grid in the initial and final stages of heat supply.
In the embodiment, the daily heat supply quantity of the regional power grid in the previous heat supply middle period can be sorted from large to small, the daily heat supply quantity close to the first preset quantity is selected, the maximum daily heat supply quantity is determined as the extreme heat supply demand load of the regional power grid, the rest average values are determined as the conventional heat supply demand load of the regional power grid, and the corresponding minimum output is calculated according to the conventional heat supply demand load of the regional power grid in the heat supply middle period and the extreme heat supply demand load of the regional power grid in the heat supply middle period respectively.
For example, the daily heat supply of the regional power grid in the previous heat supply middle period can be sequenced from large to small, the first ten large single daily heat supplies are selected, the maximum daily heat supply is determined as the extreme heat supply demand load of the regional power grid, the rest nine daily heat supplies are averaged to determine as the conventional heat supply demand load of the regional power grid, and then the corresponding minimum output is calculated according to the conventional heat supply demand load of the regional power grid in the heat supply middle period and the extreme heat supply demand load of the regional power grid in the heat supply middle period.
In the embodiment, the peak shaving type minimum output corresponding to the conventional heating demand load of the regional power grid in the middle heating period can be determined according to the following formula:
pi＝gi(qi)
pi,min≤pi≤pi,max
0≤qi≤qi,max
∑qi＝qt,zc
minpt,zct
wherein p isiThe load of a No. i unit of the regional power grid is obtained; giA thermoelectric function of the maximum heat supply capacity of the regional power grid No. i unit is obtained; q. q.siSupplying heat load to the I-number unit in the regional power grid; p is a radical ofi,minThe method comprises the following steps of 1, setting a load lower limit of a No. i unit in a regional power grid; p is a radical ofi,maxThe load upper limit of the No. i unit in the regional power grid is set; q. q.si,maxProviding an upper limit of heat supply load for the No. i unit in the regional power grid; q. q.st,zcThe load is the conventional heating demand load of the regional power grid in the middle heating period; p is a radical oft,zctThe peak shaving type minimum output corresponding to the conventional heating demand load of the regional power grid in the middle heating period is realized.
For example, the number N of units participating in heat supply in peak shaving type minimum capacity calculation corresponding to the conventional heat supply demand load of the regional power grid in the middle period of heat supplyzctAnd if the total number of the units is less than the total number of the units, determining the corresponding guaranteed minimum output of the conventional heat supply demand load of the regional power grid in the middle heat supply period according to the following formula:
pi＝gi(qi)
pi,min≤pi≤pi,max
0≤qi≤qi,max
Figure BDA0002983977620000081
minpt,zcb
the number of units participating in heat supply in the guaranteed minimum output calculation corresponding to the conventional heat supply demand load of the regional power grid in the middle heat supply period is Nzct+1，pt,zcbThe method is the minimum output of the guarantee type corresponding to the conventional heat supply demand load of the regional power grid in the middle period of heat supply.
Next, in the embodiment, the peak shaving type minimum output corresponding to the extreme heating demand load of the regional power grid in the middle heating period may be determined according to the following formula:
pi＝gi(qi)
pi,min≤pi≤pi,max
0≤qi≤qi,max
∑qi＝qt,zj
minpt,zjt
wherein p isiThe load of a No. i unit of the regional power grid is obtained; giA thermoelectric function of the maximum heat supply capacity of the regional power grid No. i unit is obtained; q. q.siSupplying heat load to the I-number unit in the regional power grid; p is a radical ofi,minThe method comprises the following steps of 1, setting a load lower limit of a No. i unit in a regional power grid; p is a radical ofi,maxThe load upper limit of the No. i unit in the regional power grid is set; q. q.si,maxProviding an upper limit of heat supply load for the No. i unit in the regional power grid; q. q.st,zjThe extreme heating demand load of the regional power grid in the middle heating period is provided; p is a radical oft,zjtThe peak shaving type minimum output corresponding to the extreme heat supply demand load of the regional power grid in the middle heat supply period is realized.
For example, the number N of units participating in heat supply in peak shaving type minimum capacity calculation corresponding to extreme heat supply demand load of regional power grid in middle heat supply periodzjtAnd if the total number of the units is less than the total number of the units, determining the corresponding guaranteed minimum output of the extreme heat supply demand load of the regional power grid in the middle heat supply period according to the following formula:
pi＝gi(qi)
pi,min≤pi≤pi,max
0≤qi≤qi,max
Figure BDA0002983977620000091
minpt,zjb
the number of units participating in heat supply in the guaranteed minimum output calculation corresponding to the extreme heat supply demand load of the regional power grid in the middle heat supply period is Nzjt+1，pt,zjbThe method is the minimum output of the guarantee type corresponding to the extreme heat supply demand load of the regional power grid in the middle heat supply period.
The following will respectively describe the specific implementation flows of the method for determining the minimum output of the coal-fired heating unit in the initial stage and the final stage of heating and the middle stage of heating with reference to fig. 2 and 3, but the scope of the embodiment of the present invention is not limited to the illustrated examples. As shown in fig. 2, the specific implementation process for determining the minimum output at the beginning and end of the heat supply of the coal-fired heat supply unit in the embodiment of the present invention is as follows:
step 201, collecting relevant data in a local power grid;
step 202, determining the range of the initial stage and the final stage of heat supply;
step 203, calculating peak shaving type minimum output of the regional power grid in the initial and final stages of heat supply;
step 204, judging whether the number of the units participating in heat supply in peak regulation type minimum output calculation of the regional power grid in the initial and final stages of heat supply is less than the total number of the units;
and step 205, if the number of the units participating in heat supply in the peak shaving type minimum output calculation of the regional power grid in the initial and final stages of heat supply is less than the total number of the units, further determining the guaranteed type minimum output of the regional power grid in the initial and final stages of heat supply.
As shown in fig. 3, the specific implementation process for determining the minimum output in the middle heating period of the coal-fired heat supply unit in the embodiment of the present invention is as follows:
301, collecting relevant data in the local power grid;
step 302, determining a middle heating range;
step 303, processing the daily heat supply load of the regional power grid in the middle heat supply period, and respectively determining the conventional heat supply demand load of the regional power grid in the middle heat supply period and the extreme heat supply demand load of the regional power grid in the middle heat supply period;
step 304, determining the peak shaving type minimum output corresponding to the conventional heat supply demand load of the regional power grid in the middle heat supply period according to the conventional heat supply demand load of the regional power grid in the middle heat supply period;
305, judging whether the number of the units participating in heat supply in peak shaving type minimum output calculation corresponding to the conventional heat supply demand load of the regional power grid in the middle period of heat supply is less than the total number of the units;
step 306, if the number of the units participating in heat supply in peak shaving type minimum output calculation corresponding to the conventional heat supply demand load of the regional power grid in the middle heat supply period is less than the total number of the units, further determining the guaranteed type minimum output corresponding to the conventional heat supply demand load of the regional power grid in the middle heat supply period;
step 307, determining peak shaving type minimum output corresponding to the extreme heat supply demand load of the regional power grid in the middle heat supply period according to the extreme heat supply demand load of the regional power grid in the middle heat supply period;
step 308, judging whether the number of the units participating in heat supply in peak shaving type minimum output calculation corresponding to the extreme heat supply demand load of the regional power grid in the middle period of heat supply is less than the total number of the units;
step 309, if the number of the units participating in heat supply in peak shaving type minimum output calculation corresponding to the extreme heat supply demand load of the regional power grid in the middle heat supply period is less than the total number of the units, further determining the guaranteed type minimum output corresponding to the extreme heat supply demand load of the regional power grid in the middle heat supply period.
Based on the same inventive concept, the embodiment of the invention also provides a device for determining the minimum output during the heating period of the coal-fired heating unit, which is described in the following implementation. Because the principle of solving the problems is similar to the method for determining the minimum output in the heat supply period of the coal-fired heat supply unit, the implementation of the device can refer to the implementation of the method, and repeated parts are not repeated.
Fig. 4 is a schematic diagram of a minimum output determination device during a heating period of a coal-fired heat supply unit in an embodiment of the present invention, and as shown in fig. 3, the minimum output determination device during the heating period of the coal-fired heat supply unit in an embodiment of the present invention may include:
the thermoelectric relationship determining module 401 is configured to determine a thermoelectric relationship of each coal-fired heat supply unit according to heat supply operation modes and thermoelectric relationships of a plurality of coal-fired heat supply units in a regional power grid;
the heat supply capacity determining module 402 is configured to determine the maximum heat supply capacity of each coal-fired heat supply unit under each electrical load working condition according to the thermoelectric relationship of each coal-fired heat supply unit;
the unit load determining module 403 is configured to determine, according to the maximum heat supply capacity of each coal-fired heat supply unit under each electric load working condition, a unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition, and upper and lower limits of the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition;
the heat supply load determining module 404 is configured to determine a heat supply load interval of each coal-fired heat supply unit according to a thermoelectric relationship of each coal-fired heat supply unit;
the minimum output determination module 405 is configured to determine the minimum output of the local power grid during the heating period according to the unit load of each coal-fired heat supply unit under the maximum heating capacity condition and the heating demand load of the local power grid, with the upper and lower limits of the unit load of each coal-fired heat supply unit under the maximum heating capacity condition and the heating load interval of each coal-fired heat supply unit as constraint conditions.
The thermoelectric relationship determining module 401 is specifically configured to determine a thermoelectric relationship curve of each coal-fired heat supply unit according to heat supply operation modes and thermoelectric relationship curves of a plurality of coal-fired heat supply units in a regional power grid;
the heat supply capacity determining module 402 is specifically configured to find, for each coal-fired heat supply unit, the maximum heat supply capacity of the coal-fired heat supply unit under each electrical load condition on a thermoelectric relationship curve of the coal-fired heat supply unit.
The unit load determining module 403 is specifically configured to fit, according to the maximum heat supply capacity of each coal-fired heat supply unit under each electrical load working condition, to obtain a thermoelectric function relation of the maximum heat supply capacity of each coal-fired heat supply unit:
pi＝gi(qi)
in the formula, piThe load of a No. i unit of the regional power grid is obtained; giA thermoelectric function of the maximum heat supply capacity of the regional power grid No. i unit is obtained; q. q.siAnd supplying heat load to the I-number unit of the regional power grid.
The minimum output determination module 405 is specifically configured to determine the minimum output of the regional power grid at the beginning and end of heat supply and in the middle and middle of heat supply respectively according to the unit load of each coal-fired heat supply unit under the maximum heat supply capacity condition and the heat supply demand load of the regional power grid, with the upper and lower limits of the unit load of each coal-fired heat supply unit under the maximum heat supply capacity condition and the heat supply load interval of each coal-fired heat supply unit as constraint conditions.
In one embodiment, the minimum output determination module 405 is specifically configured to determine the peak shaving type minimum output of the regional power grid in the initial and final stages of heating according to the following formula:
pi＝gi(qi)
pi,min≤pi≤pi,max
0≤qi≤qi,max
∑qi＝qt,c
minpt,ct
wherein, p isiThe load of a No. i unit of the regional power grid is obtained; giA thermoelectric function of the maximum heat supply capacity of the regional power grid No. i unit is obtained; q. q.siSupplying heat load to the I-number unit in the regional power grid; p is a radical ofi,minThe method comprises the following steps of 1, setting a load lower limit of a No. i unit in a regional power grid; p is a radical ofi,maxThe load upper limit of the No. i unit in the regional power grid is set; q. q.si,maxProviding an upper limit of heat supply load for the No. i unit in the regional power grid; q. q.st,cThe method comprises the steps of providing a heat supply demand load of an area power grid in the initial and final stage of heat supply, wherein the heat supply demand load is the average heat supply load of the area power grid in the previous initial and final stage of heat supply; p is a radical oft,ctThe peak shaving type minimum output of the regional power grid in the initial and final stages of heating is realized.
The minimum contribution determination module 405 may be further specifically configured to:
if the number N of the units participating in heat supply in peak regulation type minimum output calculation of the regional power grid in the initial and final stages of heat supply is NctAnd if the minimum output is less than the total number of the units, calculating the guaranteed minimum output of the regional power grid in the initial and final stages of heat supply, and determining the guaranteed minimum output of the regional power grid in the initial and final stages of heat supply according to the following formula:
pi＝gi(qi)
pi,min≤pi≤pi,max
0≤qi≤qi,max
Figure BDA0002983977620000121
minpt,cb
the number of units participating in heat supply in the guaranteed minimum output calculation of the regional power grid in the initial and final stages of heat supply is Nct+1，pt,cbThe method provides the minimum guaranteed output of the regional power grid in the initial and final stages of heat supply.
In one embodiment, the minimum output determination module 405 is specifically configured to:
sequencing the daily heat supply of the regional power grid in the middle period of the previous heat supply from large to small, selecting the daily heat supply close to the preset number, determining the maximum daily heat supply as the extreme heat supply demand load of the regional power grid, and averaging the rest to determine the conventional heat supply demand load of the regional power grid;
determining the minimum output corresponding to the conventional heat supply demand load of the regional power grid in the middle heat supply period according to the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the conventional heat supply demand load of the regional power grid by taking the upper limit and the lower limit of the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the heat supply load interval of each coal-fired heat supply unit as constraint conditions;
and/or determining the minimum output corresponding to the extreme heat supply demand load of the regional power grid in the middle heat supply period according to the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the extreme heat supply demand load of the regional power grid under the maximum heat supply capacity working condition by taking the upper limit and the lower limit of the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the heat supply load interval of each coal-fired heat supply unit as constraint conditions.
The minimum contribution determination module 405 may be further specifically configured to:
determining peak shaving type minimum output corresponding to the conventional heating demand load of the regional power grid in the middle heating period according to the following formula:
pi＝gi(qi)
pi,min≤pi≤pi,max
0≤qi≤qi,max
∑qi＝qt,zc
minpt,zct
wherein p isiThe load of a No. i unit of the regional power grid is obtained; giA thermoelectric function of the maximum heat supply capacity of the regional power grid No. i unit is obtained; q. q.siSupplying heat load to the I-number unit in the regional power grid; p is a radical ofi,minThe method comprises the following steps of 1, setting a load lower limit of a No. i unit in a regional power grid; p is a radical ofi,maxThe load upper limit of the No. i unit in the regional power grid is set; q. q.si,maxProviding an upper limit of heat supply load for the No. i unit in the regional power grid; q. q.st,zcThe load is the conventional heating demand load of the regional power grid in the middle heating period; p is a radical oft,zctThe peak shaving type minimum output corresponding to the conventional heating demand load of the regional power grid in the middle heating period is realized.
The minimum contribution determination module 405 may be further specifically configured to:
if the number N of the units participating in heat supply is calculated according to the peak shaving type minimum capacity corresponding to the conventional heat supply demand load of the regional power grid in the middle period of heat supplyzctAnd if the total number of the units is less than the total number of the units, further calculating the corresponding guaranteed minimum output of the conventional heat supply demand load of the regional power grid in the middle heat supply period according to the following formula:
pi＝gi(qi)
pi,min≤pi≤pi,max
0≤qi≤qi,max
Figure BDA0002983977620000131
minpt,zcb
the number of units participating in heat supply in the guaranteed minimum output calculation corresponding to the conventional heat supply demand load of the regional power grid in the middle heat supply period is Nzct+1，pt,zcbThe method is the minimum output of the guarantee type corresponding to the conventional heat supply demand load of the regional power grid in the middle period of heat supply.
The minimum contribution determination module 405 may be further specifically configured to:
determining peak shaving type minimum output corresponding to the extreme heat supply demand load of the regional power grid in the middle heat supply period according to the following formula:
pi＝gi(qi)
pi,min≤pi≤pi,max
0≤qi≤qi,max
∑qi＝qt,zj
minpt,zjt
wherein p isiThe load of a No. i unit of the regional power grid is obtained; giA thermoelectric function of the maximum heat supply capacity of the regional power grid No. i unit is obtained; q. q.siSupplying heat load to the I-number unit in the regional power grid; p is a radical ofi,minThe method comprises the following steps of 1, setting a load lower limit of a No. i unit in a regional power grid; p is a radical ofi,maxIs a regionThe upper limit of the load of the No. i unit in the power grid; q. q.si,maxProviding an upper limit of heat supply load for the No. i unit in the regional power grid; q. q.st,zjThe extreme heating demand load of the regional power grid in the middle heating period is provided; p is a radical oft,zjtThe peak shaving type minimum output corresponding to the extreme heat supply demand load of the regional power grid in the middle heat supply period is realized.
The minimum contribution determination module 405 may be further specifically configured to:
if the minimum output corresponding to the peak load of the extreme heat supply demand of the regional power grid in the middle period of heat supply is calculated, the number N of the units participating in heat supplyzjtAnd if the total number of the units is less than the total number of the units, further calculating the corresponding guaranteed minimum output of the extreme heat supply demand load of the regional power grid in the middle heat supply period according to the following formula:
pi＝gi(qi)
pi,min≤pi≤pi,max
0≤qi≤qi,max
Figure BDA0002983977620000141
minpt,zjb
the number of units participating in heat supply in the guaranteed minimum output calculation corresponding to the extreme heat supply demand load of the regional power grid in the middle heat supply period is Nzjt+1，pt,zjbThe method is the minimum output of the guarantee type corresponding to the extreme heat supply demand load of the regional power grid in the middle heat supply period.
Based on the aforementioned inventive concept, as shown in fig. 5, the present invention further provides a computer device 500, which includes a memory 510, a processor 520, and a computer program 530 stored in the memory 510 and executable on the processor 520, wherein the processor 520 executes the computer program 530 to implement the aforementioned method for determining the minimum output during the heating period of the coal-fired heating unit.
Based on the foregoing inventive concept, the present invention proposes a computer-readable storage medium storing a computer program which, when executed by a processor, implements the aforementioned method for determining the minimum output during a heating period of a coal-fired heating unit.
In summary, in the embodiment of the present invention, the thermoelectric relationship of each coal-fired heat supply unit is determined according to the heat supply operation modes and the thermoelectric relationship of the plurality of coal-fired heat supply units in the regional power grid; determining the maximum heat supply capacity of each coal-fired heat supply unit under each electric load working condition according to the thermoelectric relationship of each coal-fired heat supply unit; determining the unit load of each coal-fired heat supply unit under the working condition of the maximum heat supply capacity and the upper and lower limits of the unit load of each coal-fired heat supply unit under the working condition of the maximum heat supply capacity according to the maximum heat supply capacity of each coal-fired heat supply unit under the working condition of each electric load; determining a heat supply load interval of each coal-fired heat supply unit according to the thermoelectric relationship of each coal-fired heat supply unit; determining the minimum output of a regional power grid in a heating period according to the unit load of each coal-fired heat supply unit under the maximum heating capacity working condition and the heating demand load of the regional power grid by taking the upper limit and the lower limit of the unit load of each coal-fired heat supply unit under the maximum heating capacity working condition and the heating load interval of each coal-fired heat supply unit as constraint conditions; the method is adopted to determine the minimum output of the coal-fired heat supply unit in the heat supply period of the regional power grid, and can provide guidance for the production operation of the regional power grid, so that the peak regulation capacity of the regional power grid is enhanced.
In the embodiment of the invention, the upper limit and the lower limit of the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the heat supply load interval of each coal-fired heat supply unit are taken as constraint conditions, the minimum output of the regional power grid in the initial stage and the final stage of heat supply and the middle stage of heat supply can be respectively determined according to the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the heat supply demand load of the regional power grid, and the minimum output of the regional power grid in the heat supply period can be more accurately determined according to the actual heat supply.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (24)

1. A method for determining the minimum output of a coal-fired heat supply unit in a heat supply period is characterized by comprising the following steps:
determining the thermoelectric relationship of each coal-fired heat supply unit according to the heat supply operation modes and the thermoelectric relationship of a plurality of coal-fired heat supply units in the regional power grid;
determining the maximum heat supply capacity of each coal-fired heat supply unit under each electric load working condition according to the thermoelectric relationship of each coal-fired heat supply unit;
determining the unit load of each coal-fired heat supply unit under the working condition of the maximum heat supply capacity and the upper and lower limits of the unit load of each coal-fired heat supply unit under the working condition of the maximum heat supply capacity according to the maximum heat supply capacity of each coal-fired heat supply unit under the working condition of each electric load;
determining a heat supply load interval of each coal-fired heat supply unit according to the thermoelectric relationship of each coal-fired heat supply unit;
and determining the minimum output of the regional power grid in the heat supply period according to the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the heat supply demand load of the regional power grid by taking the upper limit and the lower limit of the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the heat supply load interval of each coal-fired heat supply unit as constraint conditions.
2. The method of claim 1, wherein determining the thermoelectric relationship of each coal-fired heat supply unit based on the heat supply operation and the thermoelectric relationship of the plurality of coal-fired heat supply units in the regional power grid comprises:
determining a thermoelectric relation curve of each coal-fired heat supply unit according to the heat supply operation modes and the thermoelectric relation curves of a plurality of coal-fired heat supply units in the regional power grid;
determining the maximum heat supply capacity of each coal-fired heat supply unit under each electric load working condition according to the thermoelectric relationship of each coal-fired heat supply unit, wherein the method comprises the following steps:
and for each coal-fired heat supply unit, searching the maximum heat supply capacity of the coal-fired heat supply unit under each electric load working condition on a thermoelectric relation curve of the coal-fired heat supply unit.
3. The method of claim 1, wherein determining the unit load of each coal-fired heat supply unit under the condition of the maximum heat supply capacity according to the maximum heat supply capacity of each coal-fired heat supply unit under the condition of each electric load comprises:
according to the maximum heat supply capacity of each coal-fired heat supply unit under each electric load working condition, fitting to obtain a thermoelectric function relation of the maximum heat supply capacity of each coal-fired heat supply unit:
pi＝gi(qi)
wherein p isiThe load of a No. i unit of the regional power grid is obtained; giA thermoelectric function of the maximum heat supply capacity of the regional power grid No. i unit is obtained; q. q.siAnd supplying heat load to the I-number unit of the regional power grid.
4. The method of claim 1, wherein the minimum output of the regional power grid during the heating period is determined according to the unit load of each coal-fired heat supply unit under the maximum heating capacity condition and the heating demand load of the regional power grid under the maximum heating capacity condition by taking the upper limit and the lower limit of the unit load of each coal-fired heat supply unit under the maximum heating capacity condition and the heating load interval of each coal-fired heat supply unit as constraint conditions, and the method comprises the following steps:
and respectively determining the minimum output of the regional power grid in the initial stage and the final stage of heat supply and the middle stage of heat supply according to the unit load of each coal-fired heat supply unit under the working condition of the maximum heat supply capacity and the heat supply demand load of the regional power grid by taking the upper limit and the lower limit of the unit load of each coal-fired heat supply unit under the working condition of the maximum heat supply capacity and the heat supply load interval of each coal-fired heat supply unit as constraint conditions.
5. The method of claim 4, wherein the minimum output of the regional power grid in the initial and final stages of heating is determined according to the unit load of each coal-fired heat supply unit under the maximum heating capacity condition and the heating demand load of the regional power grid under the maximum heating capacity condition by taking the upper limit and the lower limit of the unit load of each coal-fired heat supply unit under the maximum heating capacity condition and the heating load interval of each coal-fired heat supply unit as constraint conditions, and the method comprises the following steps:
determining the peak shaving type minimum output of the regional power grid in the initial and final stages of heating according to the following formula:
pi＝gi(qi)
pi,min≤pi≤pi,max
0≤qi≤qi,max
∑qi＝qt,c
min pt,ct
wherein p isiThe load of a No. i unit of the regional power grid is obtained; giA thermoelectric function of the maximum heat supply capacity of the regional power grid No. i unit is obtained; q. q.siSupplying heat load to a regional power grid No. i unit; p is a radical ofi,minThe method comprises the following steps of 1, setting a load lower limit of a No. i unit in a regional power grid; p is a radical ofi,maxThe load upper limit of the No. i unit in the regional power grid is set; q. q.si,maxProviding an upper limit of heat supply load for the No. i unit in the regional power grid; q. q.st,cThe heat supply demand load of the regional power grid in the initial and final stages of heat supply is provided; the heat supply demand load is the average heat supply load of the regional power grid in the last stage of heat supply; p is a radical oft,ctThe peak shaving type minimum output of the regional power grid in the initial and final stages of heating is realized.
6. The method of claim 5, wherein the minimum output of the regional power grid in the initial and final stages of heating is determined according to the unit load of each coal-fired heat supply unit under the maximum heating capacity condition and the heating demand load of the regional power grid under the maximum heating capacity condition by taking the upper limit and the lower limit of the unit load of each coal-fired heat supply unit under the maximum heating capacity condition and the heating load interval of each coal-fired heat supply unit as constraint conditions, and the method comprises the following steps:
if the number N of the units participating in heat supply in peak regulation type minimum output calculation of the regional power grid in the initial and final stages of heat supply is NctThe total number of the units of the regional power grid in the initial and final stages of heat supply is smaller than that of the regional power grid in the initial and final stages of heat supply, and the region in the initial and final stages of heat supply is further determined according to the following formulaGuarantee type minimum output of the power grid:
pi＝gi(qi)
pi,min≤pi≤pi,max
0≤qi≤qi,max
Figure FDA0002983977610000031
min pt,cb
the number of units participating in heat supply in the guaranteed minimum output calculation of the regional power grid in the initial and final stages of heat supply is Nct+1，pt,cbThe method provides the minimum guaranteed output of the regional power grid in the initial and final stages of heat supply.
7. The method of claim 4, wherein the minimum output of the regional power grid in the middle period of heating is determined according to the unit load of each coal-fired heat supply unit under the maximum heating capacity working condition and the heating demand load of the regional power grid by taking the upper limit and the lower limit of the unit load of each coal-fired heat supply unit under the maximum heating capacity working condition and the heating load interval of each coal-fired heat supply unit as constraint conditions, and the method comprises the following steps:
sequencing the daily heat supply of the regional power grid in the middle period of the previous heat supply from large to small, selecting the daily heat supply close to the preset number, determining the maximum daily heat supply as the extreme heat supply demand load of the regional power grid, and averaging the rest to determine the conventional heat supply demand load of the regional power grid;
determining the minimum output corresponding to the conventional heat supply demand load of the regional power grid in the middle heat supply period according to the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the conventional heat supply demand load of the regional power grid by taking the upper limit and the lower limit of the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the heat supply load interval of each coal-fired heat supply unit as constraint conditions;
and/or determining the minimum output corresponding to the extreme heat supply demand load of the regional power grid in the middle heat supply period according to the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the extreme heat supply demand load of the regional power grid under the maximum heat supply capacity working condition by taking the upper limit and the lower limit of the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the heat supply load interval of each coal-fired heat supply unit as constraint conditions.
8. The method of claim 7, wherein the determining the minimum output corresponding to the conventional heating demand load of the regional power grid in the middle period of heating according to the unit load of each coal-fired heat supply unit under the maximum heating capacity condition and the conventional heating demand load of the regional power grid under the maximum heating capacity condition with the upper and lower limits of the unit load of each coal-fired heat supply unit under the maximum heating capacity condition and the heating load interval of each coal-fired heat supply unit as constraint conditions comprises:
determining peak shaving type minimum output corresponding to the conventional heating demand load of the regional power grid in the middle heating period according to the following formula:
pi＝gi(qi)
pi,min≤pi≤pi,max
0≤qi≤qi,max
∑qi＝qt,zc
min pt,zct
wherein p isiThe load of a No. i unit of the regional power grid is obtained; giA thermoelectric function of the maximum heat supply capacity of the regional power grid No. i unit is obtained; q. q.siSupplying heat load to the I-number unit in the regional power grid; p is a radical ofi,minThe method comprises the following steps of 1, setting a load lower limit of a No. i unit in a regional power grid; p is a radical ofi,maxThe load upper limit of the No. i unit in the regional power grid is set; q. q.si,maxProviding an upper limit of heat supply load for the No. i unit in the regional power grid; q. q.st,zcThe load is the conventional heating demand load of the regional power grid in the middle heating period; p is a radical oft,zctThe peak shaving type minimum output corresponding to the conventional heating demand load of the regional power grid in the middle heating period is realized.
9. The method of claim 8, wherein the determining the minimum output corresponding to the conventional heating demand load of the regional power grid in the middle period of heating according to the unit load of each coal-fired heat supply unit under the maximum heating capacity condition and the conventional heating demand load of the regional power grid under the maximum heating capacity condition with the upper and lower limits of the unit load of each coal-fired heat supply unit under the maximum heating capacity condition and the heating load interval of each coal-fired heat supply unit as constraint conditions comprises:
if the number N of the units participating in heat supply is calculated according to the peak shaving type minimum capacity corresponding to the conventional heat supply demand load of the regional power grid in the middle period of heat supplyzctAnd if the total number of the units is less than the total number of the units, further calculating the corresponding guaranteed minimum output of the conventional heat supply demand load of the regional power grid in the middle heat supply period according to the following formula:
pi＝gi(qi)
pi,min≤pi≤pi,max
0≤qi≤qi,max
Figure FDA0002983977610000041
min pt,zcb
the number of units participating in heat supply in the guaranteed minimum output calculation corresponding to the conventional heat supply demand load of the regional power grid in the middle heat supply period is Nzct+1；pt,zcbThe method is the minimum output of the guarantee type corresponding to the conventional heat supply demand load of the regional power grid in the middle period of heat supply.
10. The method of claim 7, wherein the determining the minimum output corresponding to the extreme heating demand load of the regional power grid in the middle period of heating according to the unit load of each coal-fired heat supply unit under the maximum heating capacity condition and the extreme heating demand load of the regional power grid under the maximum heating capacity condition with the upper and lower limits of the unit load of each coal-fired heat supply unit under the maximum heating capacity condition and the heating load interval of each coal-fired heat supply unit as constraint conditions comprises:
determining peak shaving type minimum output corresponding to the extreme heat supply demand load of the regional power grid in the middle heat supply period according to the following formula:
pi＝gi(qi)
pi,min≤pi≤pi,max
0≤qi≤qi,max
∑qi＝qt,zj
min pt,zjt
wherein p isiThe load of a No. i unit of the regional power grid is obtained; giA thermoelectric function of the maximum heat supply capacity of the regional power grid No. i unit is obtained; q. q.siSupplying heat load to the I-number unit in the regional power grid; p is a radical ofi,minThe method comprises the following steps of 1, setting a load lower limit of a No. i unit in a regional power grid; p is a radical ofi,maxThe load upper limit of the No. i unit in the regional power grid is set; q. q.si,maxProviding an upper limit of heat supply load for the No. i unit in the regional power grid; q. q.st,zjThe extreme heating demand load of the regional power grid in the middle heating period is provided; p is a radical oft,zjtThe peak shaving type minimum output corresponding to the extreme heat supply demand load of the regional power grid in the middle heat supply period is realized.
11. The method of claim 10, wherein the determining the minimum output corresponding to the extreme heating demand load of the regional power grid in the middle period of heating according to the unit load of each coal-fired heat supply unit under the maximum heating capacity condition and the extreme heating demand load of the regional power grid under the maximum heating capacity condition with the upper and lower limits of the unit load of each coal-fired heat supply unit under the maximum heating capacity condition and the heating load interval of each coal-fired heat supply unit as constraint conditions comprises:
if the number N of the units participating in heat supply is calculated according to the peak shaving type minimum capacity corresponding to the extreme heat supply demand load of the regional power grid in the middle period of heat supplyzjtAnd if the total number of the units is less than the total number of the units, further calculating the corresponding guaranteed minimum output of the extreme heat supply demand load of the regional power grid in the middle heat supply period according to the following formula:
pi＝gi(qi)
pi,min≤pi≤pi,max
0≤qi≤qi,max
Figure FDA0002983977610000051
min pt,zjb
the number of units participating in heat supply in the guaranteed minimum output calculation corresponding to the extreme heat supply demand load of the regional power grid in the middle heat supply period is Nzjt+1；pt,zjbThe method is the minimum output of the guarantee type corresponding to the extreme heat supply demand load of the regional power grid in the middle heat supply period.
12. A minimum output confirming device for a heat supply period of a coal-fired heat supply unit is characterized by comprising:
the thermoelectric relationship determining module is used for determining the thermoelectric relationship of each coal-fired heat supply unit according to the heat supply operation modes and the thermoelectric relationship of a plurality of coal-fired heat supply units in the regional power grid;
the heat supply capacity determining module is used for determining the maximum heat supply capacity of each coal-fired heat supply unit under each electric load working condition according to the thermoelectric relationship of each coal-fired heat supply unit;
the unit load determining module is used for determining the unit load of each coal-fired heat supply unit under the working condition of the maximum heat supply capacity and the upper and lower limits of the unit load of each coal-fired heat supply unit under the working condition of the maximum heat supply capacity according to the maximum heat supply capacity of each coal-fired heat supply unit under the working condition of each electric load;
the heat supply load determining module is used for determining a heat supply load interval of each coal-fired heat supply unit according to the thermoelectric relationship of each coal-fired heat supply unit;
and the minimum output determining module is used for determining the minimum output of the regional power grid in the heat supply period according to the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the heat supply demand load of the regional power grid by taking the upper limit and the lower limit of the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the heat supply load interval of each coal-fired heat supply unit as constraint conditions.
13. The apparatus of claim 12, wherein the thermoelectric relationship determination module is specifically configured to:
determining a thermoelectric relation curve of each coal-fired heat supply unit according to the heat supply operation modes and the thermoelectric relation curves of a plurality of coal-fired heat supply units in the regional power grid;
the heating capacity determination module is specifically configured to:
and for each coal-fired heat supply unit, searching the maximum heat supply capacity of the coal-fired heat supply unit under each electric load working condition on a thermoelectric relation curve of the coal-fired heat supply unit.
14. The apparatus of claim 12, wherein the unit load determination module is specifically configured to:
according to the maximum heat supply capacity of each coal-fired heat supply unit under each electric load working condition, fitting to obtain a thermoelectric function relation of the maximum heat supply capacity of each coal-fired heat supply unit:
pi＝gi(qi)
in the formula, piThe load of a No. i unit of the regional power grid is obtained; giA thermoelectric function of the maximum heat supply capacity of the regional power grid No. i unit is obtained; q. q.siAnd supplying heat load to the I-number unit of the regional power grid.
15. The apparatus of claim 12, wherein the minimum contribution determination module is specifically configured to:
and respectively determining the minimum output of the regional power grid in the initial stage and the final stage of heat supply and the middle stage of heat supply according to the unit load of each coal-fired heat supply unit under the working condition of the maximum heat supply capacity and the heat supply demand load of the regional power grid by taking the upper limit and the lower limit of the unit load of each coal-fired heat supply unit under the working condition of the maximum heat supply capacity and the heat supply load interval of each coal-fired heat supply unit as constraint conditions.
16. The apparatus of claim 15, wherein the minimum contribution determination module is specifically configured to:
determining the peak shaving type minimum output of the regional power grid in the initial and final stages of heating according to the following formula:
pi＝gi(qi)
pi,min≤pi≤pi,max
0≤qi≤qi,max
∑qi＝qt,c
min pt,ct
wherein, p isiThe load of a No. i unit of the regional power grid is obtained; giA thermoelectric function of the maximum heat supply capacity of the regional power grid No. i unit is obtained; q. q.siSupplying heat load to the I-number unit in the regional power grid; p is a radical ofi,minThe method comprises the following steps of 1, setting a load lower limit of a No. i unit in a regional power grid; p is a radical ofi,maxThe load upper limit of the No. i unit in the regional power grid is set; q. q.si,maxProviding an upper limit of heat supply load for the No. i unit in the regional power grid; q. q.st,cThe method comprises the steps of providing a heat supply demand load of an area power grid in the initial and final stage of heat supply, wherein the heat supply demand load is the average heat supply load of the area power grid in the previous initial and final stage of heat supply; p is a radical oft,ctThe peak shaving type minimum output of the regional power grid in the initial and final stages of heating is realized.
17. The apparatus of claim 16, wherein the minimum contribution determination module is specifically configured to:
if the number N of the units participating in heat supply in peak regulation type minimum output calculation of the regional power grid in the initial and final stages of heat supply is NctAnd if the minimum output is less than the total number of the units, calculating the guaranteed minimum output of the regional power grid in the initial and final stages of heat supply, and determining the guaranteed minimum output of the regional power grid in the initial and final stages of heat supply according to the following formula:
pi＝gi(qi)
pi,min≤pi≤pi,max
0≤qi≤qi,max
Figure FDA0002983977610000071
min pt,cb
the number of units participating in heat supply in the guaranteed minimum output calculation of the regional power grid in the initial and final stages of heat supply is Nct+1，pt,cbThe method provides the minimum guaranteed output of the regional power grid in the initial and final stages of heat supply.
18. The apparatus of claim 15, wherein the minimum output determination module is further configured to:
sequencing the daily heat supply of the regional power grid in the middle period of the previous heat supply from large to small, selecting the daily heat supply close to the preset number, determining the maximum daily heat supply as the extreme heat supply demand load of the regional power grid, and averaging the rest to determine the conventional heat supply demand load of the regional power grid;
determining the minimum output corresponding to the conventional heat supply demand load of the regional power grid in the middle heat supply period according to the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the conventional heat supply demand load of the regional power grid by taking the upper limit and the lower limit of the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the heat supply load interval of each coal-fired heat supply unit as constraint conditions;
and/or determining the minimum output corresponding to the extreme heat supply demand load of the regional power grid in the middle heat supply period according to the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the extreme heat supply demand load of the regional power grid under the maximum heat supply capacity working condition by taking the upper limit and the lower limit of the unit load of each coal-fired heat supply unit under the maximum heat supply capacity working condition and the heat supply load interval of each coal-fired heat supply unit as constraint conditions.
19. The apparatus of claim 15, wherein the minimum contribution determination module is specifically configured to:
determining peak shaving type minimum output corresponding to the conventional heating demand load of the regional power grid in the middle heating period according to the following formula:
pi＝gi(qi)
pi,min≤pi≤pi,max
0≤qi≤qi,max
∑qi＝qt,zc
min pt,zct
wherein p isiThe load of a No. i unit of the regional power grid is obtained; giA thermoelectric function of the maximum heat supply capacity of the regional power grid No. i unit is obtained; q. q.siSupplying heat load to the I-number unit in the regional power grid; p is a radical ofi,minThe method comprises the following steps of 1, setting a load lower limit of a No. i unit in a regional power grid; p is a radical ofi,maxThe load upper limit of the No. i unit in the regional power grid is set; q. q.si,maxProviding an upper limit of heat supply load for the No. i unit in the regional power grid; q. q.st,zcThe load is the conventional heating demand load of the regional power grid in the middle heating period; p is a radical oft,zctThe peak shaving type minimum output corresponding to the conventional heating demand load of the regional power grid in the middle heating period is realized.
20. The apparatus of claim 19, wherein the minimum output determination module is specifically configured to:
if the number N of the units participating in heat supply is calculated according to the peak shaving type minimum capacity corresponding to the conventional heat supply demand load of the regional power grid in the middle period of heat supplyzctAnd if the total number of the units is less than the total number of the units, further calculating the corresponding guaranteed minimum output of the conventional heat supply demand load of the regional power grid in the middle heat supply period according to the following formula:
pi＝gi(qi)
pi,min≤pi≤pi,max
0≤qi≤qi,max
Figure FDA0002983977610000091
min pt,zcb
the number of units participating in heat supply in the guaranteed minimum output calculation corresponding to the conventional heat supply demand load of the regional power grid in the middle heat supply period is Nzct+1，pt,zcbThe method is the minimum output of the guarantee type corresponding to the conventional heat supply demand load of the regional power grid in the middle period of heat supply.
21. The apparatus of claim 18, wherein the minimum output determination module is specifically configured to:
determining peak shaving type minimum output corresponding to the extreme heat supply demand load of the regional power grid in the middle heat supply period according to the following formula:
pi＝gi(qi)
pi,min≤pi≤pi,max
0≤qi≤qi,max
∑qi＝qt,zj
min pt,zjt
wherein p isiThe load of a No. i unit of the regional power grid is obtained; giA thermoelectric function of the maximum heat supply capacity of the regional power grid No. i unit is obtained; q. q.siSupplying heat load to the I-number unit in the regional power grid; p is a radical ofi,minThe method comprises the following steps of 1, setting a load lower limit of a No. i unit in a regional power grid; p is a radical ofi,maxThe load upper limit of the No. i unit in the regional power grid is set; q. q.si,maxProviding an upper limit of heat supply load for the No. i unit in the regional power grid; q. q.st,zjThe extreme heating demand load of the regional power grid in the middle heating period is provided; p is a radical oft,zjtThe peak shaving type minimum output corresponding to the extreme heat supply demand load of the regional power grid in the middle heat supply period is realized.
22. The apparatus of claim 21, wherein the minimum output determination module is specifically configured to:
if the number N of the units participating in heat supply is calculated according to the peak shaving type minimum capacity corresponding to the extreme heat supply demand load of the regional power grid in the middle period of heat supplyzjtAnd if the total number of the units is less than the total number of the units, further calculating the corresponding guaranteed minimum output of the extreme heat supply demand load of the regional power grid in the middle heat supply period according to the following formula:
pi＝gi(qi)
pi,min≤pi≤pi,max
0≤qi≤qi,max
Figure FDA0002983977610000101
min pt,zjb
the number of units participating in heat supply in the guaranteed minimum output calculation corresponding to the extreme heat supply demand load of the regional power grid in the middle heat supply period is Nzjt+1，pt,zjbThe method is the minimum output of the guarantee type corresponding to the extreme heat supply demand load of the regional power grid in the middle heat supply period.
23. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the computer program to implement the method for determining minimum output during heating period of a coal-fired heating unit according to any one of claims 1 to 11.
24. A computer-readable storage medium storing a computer program for executing the method for determining minimum output during heating of a coal-fired heating unit according to any one of claims 1 to 11.
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