CN111898850A - Method and system for calculating heat supply capacity of electric heating comprehensive energy system with flexible thermal power plant - Google Patents

Method and system for calculating heat supply capacity of electric heating comprehensive energy system with flexible thermal power plant Download PDF

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CN111898850A
CN111898850A CN202010534383.6A CN202010534383A CN111898850A CN 111898850 A CN111898850 A CN 111898850A CN 202010534383 A CN202010534383 A CN 202010534383A CN 111898850 A CN111898850 A CN 111898850A
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吕泉
张娜
张明理
宋坤
潘霄
程孟增
孙朝
宫昊岩
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Dalian University of Technology
Economic and Technological Research Institute of State Grid Liaoning Electric Power Co Ltd
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Economic and Technological Research Institute of State Grid Liaoning Electric Power Co Ltd
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Abstract

The embodiment of the invention discloses a method and a system for calculating the heating capacity of an electric-heat comprehensive energy system with a flexible thermal power plant, wherein the method comprises the following steps: s1, creating a power generation load calculation model corresponding to the thermal power plant with flexibility, wherein the power generation load calculation model can obtain a power generation load curve based on a power generation load per-unit curve; s2, creating a new energy output calculation model corresponding to the thermal power plant with flexibility, wherein the new energy output calculation model can obtain a new energy power generation power curve based on a new energy power generation capacity per unit curve and installed capacity; s3, calculating the heat supply capacity of the thermoelectric unit in each time period according to the electric heating characteristics of the thermoelectric unit of the thermal power plant; and S4, creating a total heating capacity model of all the thermoelectric generator sets of the thermal power plant to calculate the total heating capacity of all the thermoelectric generator sets of the whole system time period by time period. The invention can calculate the heat supply capacity of the electric heating comprehensive energy system of the thermal power plant with flexibility in each time period, reveals the corresponding relation between the power generation and the heat supply of the electric heating comprehensive energy system of the thermal power plant with flexibility, and can provide reference basis for heat supply planning of the provincial-level electric heating comprehensive energy system.

Description

Method and system for calculating heat supply capacity of electric heating comprehensive energy system with flexible thermal power plant
Technical Field
The invention relates to the field of planning and design of power systems, in particular to a method and a system for calculating the heating capacity of an electric heating comprehensive energy system with a flexible thermal power plant.
Background
Under the condition of preferentially accepting renewable energy, the heat supply capacity of the thermal power plant after flexibility transformation is calculated, and reference can be provided for a decision department to make a heat supply plan.
In recent years, the phenomenon of wind abandon caused by wind-heat conflict in the heating period in winter in the three north areas of China is very serious, in order to solve the problem of wind abandon caused by wind-heat conflict, the flexibility improvement of a thermoelectric unit is actively carried out in China at present, and the essence of the method is to change the operation mode of 'fixing power by heat' of the traditional thermal power plant into the operation mode of 'fixing power by electricity', namely, renewable energy is preferentially accepted, and then cogeneration heat supply is carried out according to the residual power generation space, and if the cogeneration heat supply is insufficient due to the insufficient power generation space, other modes are adopted for compensation. With the increasing of heating area in China, under the condition that wind heat conflict is serious in the northern area at present, the heating requirement is difficult to meet only through the cogeneration of the thermoelectric generator set, and more heating capacity needs to be excavated for the thermal power plant.
In order to reduce the electric output of the extraction and condensation type unit and improve the heat supply capacity of the unit, a flexible low-pressure cylinder cutting technology is developed in recent years and is applied to a plurality of thermal power plant transformation projects. When a traditional extraction condensing type thermoelectric unit operates, in order to ensure the stable operation of a low-pressure cylinder, at least about 5-10% of steam needs to enter the low-pressure cylinder for working and then is cooled in a condenser. In order to fully improve the cogeneration capacity of the unit and reduce the power output of the unit, a flexible low-pressure cylinder cutting technology is developed in recent years and is applied to a plurality of thermal power plant transformation projects. The technology can realize the online flexible cutting/putting-in of the low-pressure cylinder steam inlet operation of the unit (only a very small amount of cooling steam is kept). Before cutting, the unit operates under a pumping and condensing working condition; after the cutting, the exhausted steam of the medium pressure cylinder is basically completely extracted for supplying heat, the low pressure cylinder runs under the high vacuum condition with zero output, and the unit can be considered to be under the back pressure working condition only under the high pressure cylinder and the medium pressure cylinder. When the low-pressure cylinder of the extraction condensing type thermoelectric unit is cut off, the waste heat of the steam entering the steam turbine after working is completely utilized, so that the co-production heat supply capacity reaches the maximum under the condition of a given electric load, and the continuous improvement is difficult.
Disclosure of Invention
Based on the above, in order to solve the defects in the prior art, a method for calculating the heat supply capacity of the electric heating comprehensive energy system with the flexible thermal power plant is provided.
A method for calculating the heating capacity of an electric heating comprehensive energy system with a flexible thermal power plant is characterized by comprising the following steps:
s1, creating a power generation load calculation model corresponding to the thermal power plant with flexibility, wherein the power generation load calculation model can obtain a power generation load curve based on a power generation load per-unit curve;
s2, creating a new energy output calculation model corresponding to the thermal power plant with flexibility, wherein the new energy output calculation model can obtain a new energy power generation power curve based on a new energy power generation capacity per unit curve and installed capacity;
s3, calculating the heat supply capacity of the thermoelectric unit in each time period according to the electric heating characteristics of the thermoelectric unit of the thermal power plant;
s4, creating a total heat supply capacity model of all thermoelectric units of the thermal power plant to calculate the total heat supply capacity of all the thermoelectric units of the whole system time period by time period, and acquiring index data representing the heat supply capacity of the whole system based on the total heat supply capacity to provide reference data for user heat supply planning decisions.
Optionally, in one embodiment, the step of calculating the heat supply capacity of the thermoelectric power unit in each time period in S3 includes:
s31, creating a heat supply capacity calculation model of the traditional thermoelectric generator set to calculate the heat supply capacity of the traditional extraction type thermoelectric generator set, namely when the electric load borne by the traditional extraction type thermoelectric generator set is PG,eAnd then, the corresponding maximum cogeneration heating power calculation formula is as follows:
Figure BDA0002536501850000021
wherein, cvThe power generation power reduction value corresponding to each unit heat supply quantity is extracted under the condition that the steam inlet quantity of the steam extraction type thermoelectric unit is constant; pB,eThe power output is the corresponding power output when the heat output of the thermoelectric unit is maximum; pemaxRespectively the maximum power generation power of the steam extraction type unit under the pure condensation working condition; c. CmThe electric heat ratio of the steam extraction type thermoelectric unit under the back pressure working condition is adopted; pe0The intersection point of the back pressure working condition operating line of the steam extraction type thermoelectric unit and the longitudinal axis is formed;
s32, creating a calculation model of the heat supply capacity of the thermoelectric generator set after the low-pressure cylinder is flexibly cut off to calculate the heat supply capacity of the thermoelectric generator set after the low-pressure cylinder is flexibly cut off, namely, when the electric load borne by the thermoelectric generator set after the low-pressure cylinder is cut off and transformed is PG,eAnd calculating corresponding maximum cogeneration heating power, wherein the corresponding calculation formula is as follows:
Figure BDA0002536501850000031
wherein, PE,eThe maximum generating power of the unit under the co-production working condition after the low-pressure cylinder is cut off is shown;
s33: creating a thermoelectric unit heat supply capacity calculation model for cutting off the low-pressure cylinder and configuring the electric boiler to calculate the heat supply capacity of the thermoelectric unit for cutting off the low-pressure cylinder and configuring the electric boiler, namely for the thermoelectric unit after configuring the electric boiler, when the electric load borne by the thermoelectric unit is PG,eThen calculate out correspondingThe maximum cogeneration heat supply power has the corresponding calculation formula as follows:
Figure BDA0002536501850000032
wherein, PE,hThe maximum heat supply power under the co-production working condition of the unit is shown after the low-pressure cylinder is cut off; pG',h、PG,hRespectively representing the maximum cogeneration heat supply power of the unit under the electric loads PG and e before and after the low-pressure cylinder is cut off; etaEBRepresenting the electric heating efficiency of the electric boiler; pB,hThe maximum heat supply power of the extraction condensing unit.
Optionally, in one embodiment, the step of creating a total heating capacity model of all thermoelectric power units in S4 includes:
s41, setting the total heat supply capacity model of all thermoelectric units as an objective function, wherein the corresponding formula is as follows:
Figure BDA0002536501850000033
in the formula:
Figure BDA0002536501850000034
the overall heating power of the thermoelectric generator set l in the time period t,
Figure BDA0002536501850000035
the electric heating power of the electric boiler configured for the thermoelectric power unit l during the time period t,
Figure BDA0002536501850000036
for the first thermoelectric power unit, K is the preferential utilization coefficient of cogeneration heat supply, wherein
Figure BDA0002536501850000037
Figure BDA0002536501850000038
For all thermoelectric units c in the systemmThe maximum value of (a) is,
Figure BDA0002536501850000041
respectively the generating capacity and the on-line power of the wind power,
Figure BDA0002536501850000042
respectively the power generation capacity and the internet power of photovoltaic power generation, R is the preferential utilization coefficient of renewable energy sources, wherein
Figure BDA0002536501850000043
T is the time period number of the system scheduling period;
s42, setting the constraint conditions of the total heating capacity model of all the thermoelectric generating sets, wherein the constraint conditions comprise:
(1) the power balance constraint condition corresponds to the following formula:
Figure BDA0002536501850000044
in the formula:
Figure BDA0002536501850000045
respectively representing net input electric power, nuclear power generation power, hydroelectric power generation power, wind power on-line power, photovoltaic power generation on-line power, thermoelectric unit l power generation power and pure condensing unit k power generation power of the system at a time period t;
Figure BDA0002536501850000046
generating a load for the system;
Figure BDA0002536501850000047
the electric heating power of an electric boiler configured for the thermoelectric unit l in a time period t;
(2) the system capacity balance constraint condition corresponds to the formula:
Figure BDA0002536501850000048
in the formula:
Figure BDA0002536501850000049
the adjustable capacity of water and electricity in the time period t; x and y are credible capacity coefficients of wind power and photovoltaic power generation, and the system is determined according to the lower boundary of a wind power and photovoltaic prediction interval;
Figure BDA00025365018500000410
respectively the adjustable capacity, U, of the thermoelectric unit l and the straight condensing unit k in the time period tk,tThe start-stop state of the straight condensing unit in the time period t is shown;
Figure BDA00025365018500000411
the installed capacity of the straight condensing unit k; z is the rotational standby coefficient of the system;
(3) the operating interval constraint condition of the straight condensing unit is represented by the corresponding formula:
Figure BDA00025365018500000412
in the formula:
Figure BDA00025365018500000413
the minimum generating power of the straight condensing unit k is obtained;
(4) the start-stop constraint condition of the pure condensing unit keeps the start-stop state unchanged in the whole scheduling period T, and the corresponding formula is as follows:
Figure BDA00025365018500000414
(5) the constraint condition of the unit operation interval with the low-pressure cylinder flexible cutting capacity is that a corresponding formula of the unit l in a time period t is as follows:
Figure BDA0002536501850000051
in the formula: i isl,tThe starting and stopping state of the low-pressure cylinder is represented by 0, starting and stopping 1;
Figure BDA0002536501850000052
for co-production of heating power;
Figure BDA0002536501850000053
for combined production of heat supply power
Figure BDA0002536501850000054
A corresponding electrical power;
Figure BDA0002536501850000055
cutting off the electric power down-regulation value after the low pressure cylinder for the unit under the condition of unchanged steam inlet quantity;
Figure BDA0002536501850000056
respectively the power generation power and the heat supply power when the low-pressure cylinder is not cut off;
Figure BDA0002536501850000057
respectively the power generation power and the heat supply power when the low-pressure cylinder is cut off;
Figure BDA0002536501850000058
representing the unit and the minimum electric output under the pure condensing working condition; phminThe unit and the minimum thermal output under the co-production working condition are represented;
(6) the unit adjustable capacity constraint condition with the low-pressure cylinder flexible cutting capacity corresponds to the following formula:
Figure BDA0002536501850000059
(7) the renewable energy output constraint condition is represented by the following corresponding formula:
Figure BDA00025365018500000510
Figure BDA00025365018500000511
(8) the electric boiler capacity constraint condition is represented by the following formula:
Figure BDA00025365018500000512
in the formula:
Figure BDA00025365018500000513
the maximum capacity of the electric boiler allocated to the thermoelectric power unit l.
In addition, in order to solve the defects of the traditional technology, a heat supply capacity calculation system of the electric heating comprehensive energy system with the flexible thermal power plant is further provided.
An electric heat integrated energy system heating capacity calculation system with a flexible thermal power plant comprises:
the system comprises a first model creating unit, a second model creating unit and a control unit, wherein the first model creating unit is used for creating a power generation load calculation model corresponding to the thermal power plant with flexibility, and the power generation load calculation model can acquire a power generation load curve based on a power generation load per unit curve;
the second model creating unit is used for creating a new energy output calculation model corresponding to the thermal power plant with flexibility, and the new energy output calculation model can obtain a new energy power generation power curve based on a new energy power generation capacity per unit curve and installed capacity;
the first calculation unit is used for calculating the heat supply capacity of the thermoelectric unit in each time period according to the electric heating characteristics of the thermoelectric unit of the thermal power plant;
and the third model creating unit is used for creating a total heat supply capacity model of all the thermoelectric units of the thermal power plant so as to calculate the total heat supply capacity of all the thermoelectric units of the whole system time by time and obtain index data representing the heat supply capacity of the whole system based on the total heat supply capacity so as to provide reference data for a user heat supply planning decision.
Optionally, in one embodiment, the step of calculating, in the first calculation unit, the heat supply capacity of the thermoelectric power unit in each period includes:
a calculation model of the heat supply capacity of the traditional thermoelectric generating set is created to calculate the heat supply capacity of the traditional extraction type thermoelectric generating set, namely when the electric load borne by the traditional extraction type thermoelectric generating set is PG,eAnd then, the corresponding maximum cogeneration heating power calculation formula is as follows:
Figure BDA0002536501850000061
wherein, cvThe power generation power reduction value corresponding to each unit heat supply quantity is extracted under the condition that the steam inlet quantity of the steam extraction type thermoelectric unit is constant; pB,eThe power output is the corresponding power output when the heat output of the thermoelectric unit is maximum; pemaxRespectively the maximum power generation power of the steam extraction type unit under the pure condensation working condition; c. CmThe electric heat ratio of the steam extraction type thermoelectric unit under the back pressure working condition is adopted; pe0The intersection point of the back pressure working condition operating line of the steam extraction type thermoelectric unit and the longitudinal axis is formed;
establishing a calculation model of the heat supply capacity of the thermoelectric generating set after the low-pressure cylinder is flexibly cut off to calculate the heat supply capacity of the thermoelectric generating set after the low-pressure cylinder is flexibly cut off, namely, when the electric load borne by the thermoelectric generating set after the low-pressure cylinder is cut off and transformed is PG,eAnd calculating corresponding maximum cogeneration heating power, wherein the corresponding calculation formula is as follows:
Figure BDA0002536501850000062
wherein, PE,eThe maximum generating power of the unit under the co-production working condition after the low-pressure cylinder is cut off is shown;
creating a thermoelectric unit heat supply capacity calculation model for cutting off the low-pressure cylinder and configuring the electric boiler to calculate the heat supply capacity of the thermoelectric unit for cutting off the low-pressure cylinder and configuring the electric boiler, namely for the thermoelectric unit after configuring the electric boiler, when the electric load borne by the thermoelectric unit is PG,eCalculating the corresponding maximum cogeneration heat power, and calculating correspondingly
The formula is as follows:
Figure BDA0002536501850000071
wherein, PE,hThe maximum heat supply power under the co-production working condition of the unit is shown after the low-pressure cylinder is cut off; pG',h、PG,hRespectively indicating the electric load of the unit before and after the low-pressure cylinder is cut offPG,eThe maximum cogeneration heating power; etaEBRepresenting the electric heating efficiency of the electric boiler; pB,hThe maximum heat supply power of the extraction condensing unit.
Optionally, in one embodiment, the step of creating, in the third model creating unit, a total heating capacity model of all thermoelectric power units includes:
firstly, setting a total heat supply capacity model objective function of all thermoelectric units, wherein the corresponding formula is as follows:
Figure BDA0002536501850000072
in the formula:
Figure BDA0002536501850000073
the overall heating power of the thermoelectric generator set l in the time period t,
Figure BDA0002536501850000074
the electric heating power of the electric boiler configured for the thermoelectric power unit l during the time period t,
Figure BDA0002536501850000075
for the first thermoelectric power unit, K is the preferential utilization coefficient of cogeneration heat supply, wherein
Figure BDA0002536501850000076
Figure BDA0002536501850000077
For all thermoelectric units c in the systemmThe maximum value of (a) is,
Figure BDA0002536501850000078
respectively the generating capacity and the on-line power of the wind power,
Figure BDA0002536501850000079
respectively the power generation capacity and the internet power of photovoltaic power generation, R is the preferential utilization coefficient of renewable energy sources, wherein
Figure BDA00025365018500000710
And T is the time period number of the system scheduling period.
Secondly, setting the total heat supply capacity model constraint conditions of all thermoelectric units, wherein the total heat supply capacity model constraint conditions comprise:
(1) the power balance constraint condition corresponds to the following formula:
Figure BDA00025365018500000711
in the formula:
Figure BDA00025365018500000712
respectively representing net input electric power, nuclear power generation power, hydroelectric power generation power, wind power on-line power, photovoltaic power generation on-line power, thermoelectric unit l power generation power and pure condensing unit k power generation power of the system at a time period t;
Figure BDA00025365018500000713
generating a load for the system;
Figure BDA00025365018500000714
the electric heating power of an electric boiler configured for the thermoelectric unit l in a time period t;
(2) the system capacity balance constraint condition corresponds to the formula:
Figure BDA0002536501850000081
in the formula:
Figure BDA0002536501850000082
the adjustable capacity of water and electricity in the time period t; x and y are credible capacity coefficients of wind power and photovoltaic power generation, namely are determined according to the lower boundary of the wind power and photovoltaic prediction interval;
Figure BDA0002536501850000083
respectively the adjustable capacity, U, of the thermoelectric unit l and the straight condensing unit k in the time period tk,tThe start-stop state of the straight condensing unit in the time period t is shown;
Figure BDA0002536501850000084
the installed capacity of the straight condensing unit k; z is the rotational standby coefficient of the system;
(3) the operating interval constraint condition of the straight condensing unit is represented by the corresponding formula:
Figure BDA0002536501850000085
in the formula:
Figure BDA0002536501850000086
the minimum generating power of the straight condensing unit k is obtained;
(4) the start-stop constraint condition of the pure condensing unit keeps the start-stop state unchanged in the whole scheduling period T, and the corresponding formula is as follows:
Figure BDA0002536501850000087
(5) the constraint condition of the unit operation interval with the low-pressure cylinder flexible cutting capacity is that a corresponding formula of the unit l in a time period t is as follows:
Figure BDA0002536501850000088
in the formula: i isl,tThe starting and stopping state of the low-pressure cylinder is represented by 0, starting and stopping 1;
Figure BDA0002536501850000089
for co-production of heating power;
Figure BDA00025365018500000810
for combined production of heat supply power
Figure BDA00025365018500000811
A corresponding electrical power;
Figure BDA00025365018500000812
the steam inlet quantity of the unit is not changedUnder the condition, cutting off the electric power down-regulation value after the low-pressure cylinder;
Figure BDA00025365018500000813
respectively the power generation power and the heat supply power when the low-pressure cylinder is not cut off;
Figure BDA00025365018500000814
respectively the power generation power and the heat supply power when the low-pressure cylinder is cut off; peminRepresenting the unit and the minimum electric output under the pure condensing working condition; phminThe unit and the minimum thermal output under the co-production working condition are represented;
(6) the unit adjustable capacity constraint condition with the low-pressure cylinder flexible cutting capacity corresponds to the following formula:
Figure BDA0002536501850000091
(7) the renewable energy output constraint condition is represented by the following corresponding formula:
Figure BDA0002536501850000092
Figure BDA0002536501850000093
(8) the electric boiler capacity constraint condition is represented by the following formula:
Figure BDA0002536501850000094
in the formula:
Figure BDA0002536501850000095
the maximum capacity of the electric boiler allocated to the thermoelectric power unit l.
The embodiment of the invention has the following beneficial effects:
the invention can calculate the heat supply capacity of the electric heating comprehensive energy system of the thermal power plant with flexibility in each time period, can reveal the corresponding relation between the power generation and the heat supply of the electric heating comprehensive energy system of the thermal power plant with flexibility, and can provide reference data for the district-level electric heating comprehensive energy system to perform heat supply planning.
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.
Wherein:
FIG. 1 is a flow chart of the steps corresponding to the method of the present invention;
FIG. 2 is a graph of the power generation load during a heating period in an exemplary embodiment;
FIG. 3 is a per unit value curve of wind power output during the heating period in one embodiment;
FIG. 4 is a per unit photovoltaic output curve during the heating period in one embodiment;
FIG. 5 is a diagram illustrating the power balance of a thermoelectric power unit configured with an electric boiler in accordance with an exemplary embodiment;
FIG. 6 is a system heating capacity curve before and after unit modification in an embodiment.
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.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present application. The first and second elements are both elements, but they are not the same element.
On the basis of a low-pressure cylinder flexible cutting technology, the electric boiler is additionally arranged on the heat supply motor set, and surplus electric power caused by electric-thermal coupling is converted into heat energy by the electric boiler, so that the heat supply level can be improved on the premise of further meeting the requirement of electric power output; in addition, the smaller the electrical load borne by the thermoelectric unit after the electric boiler is configured, the larger the total heat supply capacity of the thermoelectric unit, so that along with the continuous improvement of the penetration ratio of renewable energy sources in the power system at the power generation side, after the system preferentially consumes the renewable energy sources, the demand of the new energy sources consumed by the power system side and the heat supply ratio of clean energy sources increased by the heat supply system side can be simultaneously met by the thermoelectric plant after the electric boiler is configured, and the method is an effective means for realizing the cooperative development of the two. The invention can calculate the heating capacity of the electric heating comprehensive energy system of the thermal power plant with flexibility, help the planning decision maker to mine the heating capacity of the thermal power plant and provide reference data for the heating planning decision.
Based on the above purpose, in this embodiment, a method for calculating a heating capacity of an electric-thermal integrated energy system with a flexible thermal power plant is provided, and data of a certain day of a heating period is selected, so as to clearly and completely describe the technical scheme in the embodiment of the present invention: as shown in fig. 1, the method specifically includes: s1, creating a power generation load calculation model corresponding to the thermal power plant with flexibility, wherein the power generation load calculation model can acquire a power generation load curve based on a power generation load per-unit curve, namely, the power generation load curve is constructed by taking the power generation load per-unit curve as a reference to simulate the power generation load condition of the system every hour, and a specific curve is constructed by a user according to an actual system and design requirements by referring to the power generation load per-unit curve; preferably, as can be seen from fig. 2, the maximum load can be set to 3803MW, and the minimum load can be 2253 MW; s2, creating a new energy output calculation model corresponding to the thermal power plant with flexibility, wherein the new energy output calculation model can obtain a new energy power generation power curve based on a new energy power generation capacity per unit curve and installed capacity, namely, the new energy power generation capacity per unit curve is multiplied by the installed capacity to obtain a new energy hourly power generation power curve, and as shown in the graph in FIGS. 3-4, a specific curve is automatically constructed by a user according to an actual system and design requirements by referring to the new energy power generation capacity per unit curve; preferably, the new energy source at least comprises wind energy and solar energy; s3, calculating the heat supply capacity of the thermoelectric unit in each time period according to the electric heating characteristics of the thermoelectric unit of the thermal power plant; s4, creating a total heat supply capacity model of all thermoelectric units of the thermal power plant to calculate the total heat supply capacity of all the thermoelectric units of the whole system time by time, and acquiring index data representing the heat supply capacity of the whole system based on the total heat supply capacity to provide reference data for user heat supply planning decisions; the index data includes at least a continuous curve characterizing the heating capacity of the whole system, a probability distribution, a guaranteed capacity at a given confidence level, and the like.
In some specific embodiments, the step of calculating the heat supply capacity of the thermoelectric power unit at each time interval in S3 includes:
s31, creating a heat supply capacity calculation model of the traditional thermoelectric generator set to calculate the heat supply capacity of the traditional extraction type thermoelectric generator set, namely when the electric load borne by the traditional extraction type thermoelectric generator set is PG,eAt time, corresponding maximum
The calculation formula of the cogeneration heat supply power is as follows:
Figure BDA0002536501850000111
wherein, cvThe power generation power reduction value corresponding to each unit heat supply quantity is extracted under the condition that the steam inlet quantity of the steam extraction type thermoelectric unit is constant; pB,eThe power output is the corresponding power output when the heat output of the thermoelectric unit is maximum; pemaxRespectively the maximum power generation power of the steam extraction type unit under the pure condensation working condition; c. CmThe electric heat ratio of the steam extraction type thermoelectric unit under the back pressure working condition is adopted; pe0The intersection point of the back pressure working condition operating line of the steam extraction type thermoelectric unit and the longitudinal axis is formed;
s32, creating a calculation model of the heat supply capacity of the thermoelectric generator set after the low-pressure cylinder is flexibly cut off to calculate the heat supply capacity of the thermoelectric generator set after the low-pressure cylinder is flexibly cut off, namely, when the electric load borne by the thermoelectric generator set after the low-pressure cylinder is cut off and transformed is PG,eAnd calculating corresponding maximum cogeneration heating power, wherein the corresponding calculation formula is as follows:
Figure BDA0002536501850000112
wherein, PE,eAnd the maximum generating power of the unit under the co-production working condition after the low-pressure cylinder is cut is shown.
S33: creating a thermoelectric unit heat supply capacity calculation model for cutting off the low-pressure cylinder and configuring the electric boiler to calculate the heat supply capacity of the thermoelectric unit for cutting off the low-pressure cylinder and configuring the electric boiler, namely for the thermoelectric unit after configuring the electric boiler, when the electric load borne by the thermoelectric unit is PG,eAnd calculating corresponding maximum cogeneration heating power, wherein the corresponding calculation formula is as follows:
Figure BDA0002536501850000121
wherein, PE,hThe maximum heat supply power under the co-production working condition of the unit is shown after the low-pressure cylinder is cut off; pG',h、PG,hRespectively shows that the unit is under the electric load P before and after the low-pressure cylinder is cut offG,eThe maximum cogeneration heating power; etaEBRepresenting the electric heating efficiency of the electric boiler; pB,hThe specific calculation result is shown in table 1 for the maximum heating power of the extraction and condensation type unit.
TABLE 1 Unit parameters
Figure BDA0002536501850000122
In some specific embodiments, as shown in fig. 4 to 5, the purpose of S4 is to calculate the maximum heating capacity of the system under the condition of preferentially receiving renewable energy, that is, according to the power structure of the system and the heating capacity of each thermoelectric power unit, under the condition of preferentially receiving renewable energy, with the power balance on the power system side as a constraint and the maximum heating capacity on the heating system side as a target, a model for calculating the total heating capacity of all thermoelectric power units in the entire system is established, and the total heating capacity of all thermoelectric power units in the entire system is calculated time by time. Specifically, the step of correspondingly creating a total heating capacity model of all thermoelectric generating sets comprises the following steps:
s41, because the thermoelectric power unit always preferentially utilizes the generator to carry out cogeneration heating, the electric boiler can be used for heating by utilizing the residual capacity of the boiler of the power unit; the total supply of all thermoelectric units is correspondingly set
The thermal energy model objective function has the corresponding formula:
Figure BDA0002536501850000131
in the formula:
Figure BDA0002536501850000132
the overall heating power of the thermoelectric generator set l in the time period t,
Figure BDA0002536501850000133
the electric heating power of the electric boiler configured for the thermoelectric power unit l during the time period t,
Figure BDA0002536501850000134
for the first thermoelectric power unit, K is the preferential utilization coefficient of cogeneration heat supply, wherein
Figure BDA0002536501850000135
Figure BDA0002536501850000136
For all thermoelectric units c in the systemmThe maximum value of (a) is,
Figure BDA0002536501850000137
respectively the generating capacity and the on-line power of the wind power,
Figure BDA0002536501850000138
respectively the power generation capacity and the internet power of photovoltaic power generation, R is the preferential utilization coefficient of renewable energy sources, wherein
Figure BDA0002536501850000139
And T is the time period number of the system scheduling period.
S42, setting the total heating capacity model constraint conditions of all thermoelectric units, wherein the total heating capacity model constraint conditions comprise:
(1) the power balance constraint condition corresponds to the following formula:
Figure BDA00025365018500001310
in the formula:
Figure BDA00025365018500001311
respectively representing net input electric power, nuclear power generation power, hydroelectric power generation power, wind power on-line power, photovoltaic power generation on-line power, thermoelectric unit l power generation power and pure condensing unit k power generation power of the system at a time period t;
Figure BDA00025365018500001312
generating a load for the system;
Figure BDA00025365018500001313
the electric heating power of an electric boiler configured for the thermoelectric unit l in a time period t;
(2) the system capacity balance constraint condition corresponds to the formula:
Figure BDA00025365018500001314
in the formula:
Figure BDA00025365018500001315
the adjustable capacity of water and electricity in the time period t; x and y are credible capacity coefficients of wind power and photovoltaic power generation and can be determined according to the lower boundary of the prediction interval;
Figure BDA0002536501850000141
respectively the adjustable capacity, U, of the thermoelectric unit l and the straight condensing unit k in the time period tk,tThe start-stop state of the straight condensing unit in the time period t is shown;
Figure BDA0002536501850000142
the installed capacity of the straight condensing unit k; z is the rotational standby coefficient of the system;
(3) the operating interval constraint condition of the straight condensing unit is represented by the corresponding formula:
Figure BDA0002536501850000143
in the formula:
Figure BDA0002536501850000144
the minimum generating power of the straight condensing unit k is obtained;
(4) the start-stop constraint condition of the pure condensing unit keeps the start-stop state unchanged in the whole scheduling period T, and the corresponding formula is as follows:
Figure BDA0002536501850000145
(5) the constraint condition of the unit operation interval with the low-pressure cylinder flexible cutting capacity is that a corresponding formula of the unit l in a time period t is as follows:
Figure BDA0002536501850000146
in the formula: i isl,tThe starting and stopping state of the low-pressure cylinder is represented by 0, starting and stopping 1;
Figure BDA0002536501850000147
for co-production of heating power;
Figure BDA0002536501850000148
cutting off the electric power down-regulation value after the low pressure cylinder for the unit under the condition of unchanged steam inlet quantity;
Figure BDA0002536501850000149
respectively the power generation power and the heat supply power when the low-pressure cylinder is not cut off;
Figure BDA00025365018500001410
respectively the power generation power and the heat supply power when the low-pressure cylinder is cut off;
(6) the unit adjustable capacity constraint condition with the low-pressure cylinder flexible cutting capacity corresponds to the following formula:
Figure BDA00025365018500001411
(7) the renewable energy output constraint condition is represented by the following corresponding formula:
Figure BDA00025365018500001412
Figure BDA0002536501850000151
(8) the electric boiler capacity constraint condition is represented by the following formula:
Figure BDA0002536501850000152
in the formula:
Figure BDA0002536501850000153
the maximum capacity of the electric boiler allocated to the thermoelectric power unit l.
As can be seen from fig. 5 to 6, the following information can be obtained by the constraint conditions set as described above: in the period when the generating space is not sufficient, the heat supply output of the unit is in direct proportion to the generating space; in the period of sufficient power generation space, if the adjustable capacity of the system is sufficient, the thermoelectric unit can operate at the maximum heat supply output, and if the adjustable capacity of the system is not sufficient, the thermoelectric unit can reduce the heat supply output; meanwhile, the lower the output of the co-production heat supply is, the more the heat supply quantity is increased after the electric boiler is utilized, and the total heat supply capacity is in inverse proportion to the power generation space of the power plant on line; and along with the reduction of the minimum output rate of the straight condensing unit, the heat supply capacity of the system under the scheme of non-transformation and low-pressure cylinder cutting transformation is improved to some extent, and the heat supply capacity under the scheme of low-pressure cylinder cutting transformation and electric boiler configuration is reduced to some extent.
In addition, in order to solve the defects of the traditional technology, a heat supply capacity calculation system of the electric heating comprehensive energy system with the flexible thermal power plant is further provided.
An electric heat integrated energy system heating capacity calculation system with a flexible thermal power plant comprises:
the system comprises a first model creating unit, a second model creating unit and a control unit, wherein the first model creating unit is used for creating a power generation load calculation model corresponding to the thermal power plant with flexibility, and the power generation load calculation model can acquire a power generation load curve based on a power generation load per unit curve;
the second model creating unit is used for creating a new energy output calculation model corresponding to the thermal power plant with flexibility, and the new energy output calculation model can obtain a new energy power generation power curve based on a new energy power generation capacity per unit curve and installed capacity;
the first calculation unit is used for calculating the heat supply capacity of the thermoelectric unit in each time period according to the electric heating characteristics of the thermoelectric unit of the thermal power plant;
and the third model creating unit is used for creating a total heating capacity model of all the thermoelectric units of the thermal power plant so as to calculate the total heating capacity of all the thermoelectric units of the whole system by time intervals.
In some specific embodiments, the step of calculating, in the first calculation unit, the heat supply capacity of the thermoelectric power unit at each time period includes:
a calculation model of the heat supply capacity of the traditional thermoelectric generating set is created to calculate the heat supply capacity of the traditional extraction type thermoelectric generating set, namely when the electric load borne by the traditional extraction type thermoelectric generating set is PG,eTime, corresponding maximum co-production
The heat supply power calculation formula is as follows:
Figure BDA0002536501850000161
wherein, cvThe power generation power reduction value corresponding to each unit heat supply quantity is extracted under the condition that the steam inlet quantity of the steam extraction type thermoelectric unit is constant; c. CmThe electric heat ratio of the steam extraction type thermoelectric unit under the back pressure working condition is adopted;
Figure BDA0002536501850000162
respectively the minimum power generation power and the maximum power generation power of the steam extraction type unit under the pure condensation working condition;
Figure BDA0002536501850000163
respectively the minimum heat supply power and the maximum heat supply power P of the steam extraction type unit under the co-production working conditione0The intersection point of the back pressure working condition operating line of the steam extraction type thermoelectric unit and the longitudinal axis is formed;
establishing a calculation model of the heat supply capacity of the thermoelectric generating set after the low-pressure cylinder is flexibly cut off to calculate the heat supply capacity of the thermoelectric generating set after the low-pressure cylinder is flexibly cut off, namely, when the electric load borne by the thermoelectric generating set after the low-pressure cylinder is cut off and transformed is PG,eAnd calculating corresponding maximum cogeneration heating power, wherein the corresponding calculation formula is as follows:
Figure BDA0002536501850000164
creating a thermoelectric unit heat supply capacity calculation model for cutting off the low-pressure cylinder and configuring the electric boiler to calculate the heat supply capacity of the thermoelectric unit for cutting off the low-pressure cylinder and configuring the electric boiler, namely for the thermoelectric unit after configuring the electric boiler, when the electric load borne by the thermoelectric unit is PG,eAnd calculating corresponding maximum cogeneration heating power, wherein the corresponding calculation formula is as follows:
Figure BDA0002536501850000165
in some specific embodiments, the step of creating a total heating capacity model of all thermoelectric power units in the third model creation unit includes:
firstly, setting a total heat supply capacity model objective function of all thermoelectric units, wherein the corresponding formula is as follows:
Figure BDA0002536501850000166
in the formula:
Figure BDA0002536501850000171
the overall heating power of the thermoelectric generator set l in the time period t,
Figure BDA0002536501850000172
the electric heating power of the electric boiler configured for the thermoelectric power unit l during the time period t,
Figure BDA0002536501850000173
for the first thermoelectric power unit, K is the preferential utilization coefficient of cogeneration heat supply, wherein
Figure BDA0002536501850000174
Figure BDA0002536501850000175
For all thermoelectric units c in the systemmThe maximum value of (a) is,
Figure BDA0002536501850000176
respectively the generating capacity and the on-line power of the wind power,
Figure BDA0002536501850000177
respectively the power generation capacity and the internet power of photovoltaic power generation, R is the preferential utilization coefficient of renewable energy sources, wherein
Figure BDA0002536501850000178
And T is the time period number of the system scheduling period.
Secondly, setting the total heat supply capacity model constraint conditions of all thermoelectric units, wherein the total heat supply capacity model constraint conditions comprise:
(1) the power balance constraint condition corresponds to the following formula:
Figure BDA0002536501850000179
in the formula:
Figure BDA00025365018500001710
respectively representing net input electric power, nuclear power generation power, hydroelectric power generation power, wind power on-line power, photovoltaic power generation on-line power, thermoelectric unit l power generation power and pure condensing unit k power generation power of the system at a time period t;
Figure BDA00025365018500001711
generating a load for the system;
Figure BDA00025365018500001712
the electric heating power of an electric boiler configured for the thermoelectric unit l in a time period t;
(2) the system capacity balance constraint condition corresponds to the formula:
Figure BDA00025365018500001713
in the formula:
Figure BDA00025365018500001714
the adjustable capacity of water and electricity in the time period t; x and y are credible capacity coefficients of wind power and photovoltaic power generation, namely are determined according to the lower boundary of the wind power and photovoltaic prediction interval;
Figure BDA00025365018500001715
respectively the adjustable capacity, U, of the thermoelectric unit l and the straight condensing unit k in the time period tk,tThe start-stop state of the straight condensing unit in the time period t is shown;
Figure BDA00025365018500001716
the installed capacity of the straight condensing unit k; z is the rotational standby coefficient of the system;
(3) the operating interval constraint condition of the straight condensing unit is represented by the corresponding formula:
Figure BDA00025365018500001717
in the formula:
Figure BDA00025365018500001718
the minimum generating power of the straight condensing unit k is obtained;
(4) the start-stop constraint condition of the pure condensing unit keeps the start-stop state unchanged in the whole scheduling period T, and the corresponding formula is as follows:
Figure BDA0002536501850000181
(5) the constraint condition of the unit operation interval with the low-pressure cylinder flexible cutting capacity is that a corresponding formula of the unit l in a time period t is as follows:
Figure BDA0002536501850000182
in the formula: i isl,tThe starting and stopping state of the low-pressure cylinder is represented by 0, starting and stopping 1;
Figure BDA0002536501850000183
for co-production of heating power;
Figure BDA0002536501850000184
for combined production of heat supply power
Figure BDA0002536501850000185
A corresponding electrical power;
Figure BDA0002536501850000186
cutting off the electric power down-regulation value after the low pressure cylinder for the unit under the condition of unchanged steam inlet quantity;
Figure BDA0002536501850000187
respectively the power generation power and the heat supply power when the low-pressure cylinder is not cut off;
Figure BDA0002536501850000188
respectively generating power and supply power when the low-pressure cylinder is cut offThermal power; peminRepresenting the unit and the minimum electric output under the pure condensing working condition; phminThe unit and the minimum thermal output under the co-production working condition are represented;
(6) the unit adjustable capacity constraint condition with the low-pressure cylinder flexible cutting capacity corresponds to the following formula:
Figure BDA0002536501850000189
(7) the renewable energy output constraint condition is represented by the following corresponding formula:
Figure BDA00025365018500001810
Figure BDA00025365018500001811
(8) the electric boiler capacity constraint condition is represented by the following formula:
Figure BDA00025365018500001812
in the formula:
Figure BDA00025365018500001813
the maximum capacity of the electric boiler allocated to the thermoelectric power unit l.
In summary, the invention essentially discloses a method for calculating the heating capacity of an electric heating comprehensive energy system with a flexible thermal power plant, which realizes the calculation of the heating capacity of the system after flexibly cutting off a low-pressure cylinder of a thermoelectric unit and additionally installing an electric boiler, and simulates and calculates the time sequence curve of the maximum heating power of the system from the initial moment to the time sequence according to the electric power balance and the relevant constraint conditions based on the system parameters; meanwhile, based on the curve, various indexes such as a continuous curve, probability distribution, guarantee capability under given confidence coefficient and the like representing the whole maximum heating power and the heating capability of the system are constructed to help a planning decision maker to mine the heating capability of the thermal power plant and provide reference for heating planning decision making.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (6)

1. A method for calculating the heating capacity of an electric heating comprehensive energy system with a flexible thermal power plant is characterized by comprising the following steps of 1:
s1, creating a power generation load calculation model corresponding to the thermal power plant with flexibility, wherein the power generation load calculation model can obtain a power generation load curve based on a power generation load per-unit curve;
s2, creating a new energy output calculation model corresponding to the thermal power plant with flexibility, wherein the new energy output calculation model can obtain a new energy power generation power curve based on a new energy power generation capacity per unit curve and installed capacity;
s3, calculating the heat supply capacity of the thermoelectric unit in each time period according to the electric heating characteristics of the thermoelectric unit of the thermal power plant;
s4, creating a total heat supply capacity model of all thermoelectric units of the thermal power plant to calculate the total heat supply capacity of all the thermoelectric units of the whole system time period by time period, and acquiring index data representing the heat supply capacity of the whole system based on the total heat supply capacity to provide reference data for user heat supply planning decisions.
2. The method of claim 1, wherein the step of calculating the heating capacity of the thermoelectric generator set at each time interval in the step S3 comprises:
s31, creating a heat supply capacity calculation model of the traditional thermoelectric generator set to calculate the heat supply capacity of the traditional extraction type thermoelectric generator set, namely when the electric load borne by the traditional extraction type thermoelectric generator set is PG,eAnd then, the corresponding maximum cogeneration heating power calculation formula is as follows:
Figure FDA0002536501840000011
wherein, cvThe power generation power reduction value corresponding to each unit heat supply quantity is extracted under the condition that the steam inlet quantity of the steam extraction type thermoelectric unit is constant; c. CmThe electric heat ratio of the steam extraction type thermoelectric unit under the back pressure working condition is adopted; pB,eThe power output is the corresponding power output when the heat output of the thermoelectric unit is maximum; pemaxRespectively the minimum power generation power and the maximum power generation power of the steam extraction type unit under the pure condensation working condition; pe0The intersection point of the back pressure working condition operating line of the steam extraction type thermoelectric unit and the longitudinal axis is formed;
s32, creating a calculation model of the heat supply capacity of the thermoelectric generator set after the low-pressure cylinder is flexibly cut off to calculate the heat supply capacity of the thermoelectric generator set after the low-pressure cylinder is flexibly cut off, namely, when the electric load borne by the thermoelectric generator set after the low-pressure cylinder is cut off and transformed is PG,eAnd calculating corresponding maximum cogeneration heating power, wherein the corresponding calculation formula is as follows:
Figure FDA0002536501840000021
wherein, PE,eThe maximum generating power of the unit under the co-production working condition after the low-pressure cylinder is cut off is shown;
s33: creating a thermoelectric unit heat supply capacity calculation model for cutting off the low-pressure cylinder and configuring the electric boiler to calculate the heat supply capacity of the thermoelectric unit for cutting off the low-pressure cylinder and configuring the electric boiler, namely for the thermoelectric unit after configuring the electric boiler, when the electric load borne by the thermoelectric unit is PG,eAnd calculating corresponding maximum cogeneration heating power, wherein the corresponding calculation formula is as follows:
Figure FDA0002536501840000022
wherein, PE,hThe maximum heat supply power under the co-production working condition of the unit is shown after the low-pressure cylinder is cut off; pG',h、PG,hRespectively shows that the unit is powered on before and after the low-pressure cylinder is cut offLoad PG,eThe maximum cogeneration heating power; etaEBRepresenting the electric heating efficiency of the electric boiler; pB,hThe maximum heat supply power of the extraction condensing unit.
3. The method of claim 2, wherein the step of creating a total heating capacity model of all the thermoelectric generator sets in S4 comprises:
s41, setting a target function of a total heat supply capacity model of all thermoelectric units, wherein the corresponding formula is as follows:
Figure FDA0002536501840000023
in the formula:
Figure FDA0002536501840000024
the overall heating power of the thermoelectric generator set l in the time period t,
Figure FDA0002536501840000025
the electric heating power of the electric boiler configured for the thermoelectric power unit l during the time period t,
Figure FDA0002536501840000026
for the first thermoelectric power unit, K is the preferential utilization coefficient of cogeneration heat supply, wherein
Figure FDA0002536501840000027
Figure FDA0002536501840000028
For all thermoelectric units c in the systemmThe maximum value of (a) is,
Figure FDA0002536501840000029
respectively the generating capacity and the on-line power of the wind power,
Figure FDA00025365018400000210
respectively for photovoltaic power generationR is a preferential utilization coefficient of renewable energy, wherein
Figure FDA0002536501840000031
T is the time period number of the system scheduling period;
s42, setting the constraint conditions of the total heating capacity model of all the thermoelectric generating sets, wherein the constraint conditions comprise:
(1) the power balance constraint condition corresponds to the following formula:
Figure FDA0002536501840000032
in the formula:
Figure FDA0002536501840000033
respectively representing net input electric power, nuclear power generation power, hydroelectric power generation power, wind power on-line power, photovoltaic power generation on-line power, thermoelectric unit l power generation power and pure condensing unit k power generation power of the system at a time period t;
Figure FDA0002536501840000034
generating a load for the system;
Figure FDA0002536501840000035
the electric heating power of an electric boiler configured for the thermoelectric unit l in a time period t;
(2) the system capacity balance constraint condition corresponds to the formula:
Figure FDA0002536501840000036
in the formula:
Figure FDA0002536501840000037
the adjustable capacity of water and electricity in the time period t; x and y are credible capacity coefficients of wind power and photovoltaic power generation;
Figure FDA0002536501840000038
respectively the adjustable capacity, U, of the thermoelectric unit l and the straight condensing unit k in the time period tk,tThe start-stop state of the straight condensing unit in the time period t is shown;
Figure FDA0002536501840000039
the installed capacity of the straight condensing unit k; z is the rotational standby coefficient of the system;
(3) the operating interval constraint condition of the straight condensing unit is represented by the corresponding formula:
Figure FDA00025365018400000310
in the formula:
Figure FDA00025365018400000311
the minimum generating power of the straight condensing unit k is obtained;
(4) the start-stop constraint condition of the pure condensing unit keeps the start-stop state unchanged in the whole scheduling period T, and the corresponding formula is as follows:
Figure FDA00025365018400000312
(5) the constraint condition of the unit operation interval with the low-pressure cylinder flexible cutting capacity is that a corresponding formula of the unit l in a time period t is as follows:
Figure FDA0002536501840000041
in the formula: i isl,tThe starting and stopping state of the low-pressure cylinder is represented by 0, starting and stopping 1;
Figure FDA0002536501840000042
for co-production of heating power;
Figure FDA0002536501840000043
for combined production of heat supply power
Figure FDA0002536501840000044
A corresponding electrical power;
Figure FDA0002536501840000045
cutting off the electric power down-regulation value after the low pressure cylinder for the unit under the condition of unchanged steam inlet quantity;
Figure FDA0002536501840000046
respectively the power generation power and the heat supply power when the low-pressure cylinder is not cut off;
Figure FDA0002536501840000047
respectively the power generation power and the heat supply power when the low-pressure cylinder is cut off;
Figure FDA0002536501840000048
representing the unit and the minimum electric output under the pure condensing working condition;
Figure FDA0002536501840000049
the minimum thermal output of the unit under the co-production working condition is represented;
(6) the unit adjustable capacity constraint condition with the low-pressure cylinder flexible cutting capacity corresponds to the following formula:
Figure FDA00025365018400000410
(7) the renewable energy output constraint condition is represented by the following corresponding formula:
Figure FDA00025365018400000411
Figure FDA00025365018400000412
(8) the electric boiler capacity constraint condition is represented by the following formula:
Figure FDA00025365018400000413
in the formula:
Figure FDA00025365018400000414
the maximum capacity of the electric boiler allocated to the thermoelectric power unit l.
4. An electric heat integrated energy system heating capacity calculation system with a flexible thermal power plant comprises:
the system comprises a first model creating unit, a second model creating unit and a control unit, wherein the first model creating unit is used for creating a power generation load calculation model corresponding to the thermal power plant with flexibility, and the power generation load calculation model can acquire a power generation load curve based on a power generation load per unit curve;
the second model creating unit is used for creating a new energy output calculation model corresponding to the thermal power plant with flexibility, and the new energy output calculation model can obtain a new energy power generation power curve based on a new energy power generation capacity per unit curve and installed capacity;
the first calculation unit is used for calculating the heat supply capacity of the thermoelectric unit in each time period according to the electric heating characteristics of the thermoelectric unit of the thermal power plant;
and the third model creating unit is used for creating a total heat supply capacity model of all the thermoelectric units of the thermal power plant so as to calculate the total heat supply capacity of all the thermoelectric units of the whole system time by time and obtain index data representing the heat supply capacity of the whole system based on the total heat supply capacity so as to provide reference data for a user heat supply planning decision.
5. The system of claim 1, wherein the step of calculating the heating capacity of the thermoelectric power unit at each time interval in the first calculation unit comprises:
a calculation model of the heat supply capacity of the traditional thermoelectric generating set is created to calculate the heat supply capacity of the traditional extraction type thermoelectric generating set, namely when the electric load borne by the traditional extraction type thermoelectric generating set is PG,eAnd then, the corresponding maximum cogeneration heating power calculation formula is as follows:
Figure FDA0002536501840000051
wherein, cvThe power generation power reduction value corresponding to each unit heat supply quantity is extracted under the condition that the steam inlet quantity of the steam extraction type thermoelectric unit is constant; c. CmThe electric heat ratio of the steam extraction type thermoelectric unit under the back pressure working condition is adopted; pB,eThe power output is the corresponding power output when the heat output of the thermoelectric unit is maximum; pemaxRespectively the maximum power generation power of the steam extraction type unit under the pure condensation working condition; pe0The intersection point of the back pressure working condition operating line of the steam extraction type thermoelectric unit and the longitudinal axis is formed;
establishing a calculation model of the heat supply capacity of the thermoelectric generating set after the low-pressure cylinder is flexibly cut off to calculate the heat supply capacity of the thermoelectric generating set after the low-pressure cylinder is flexibly cut off, namely, when the electric load borne by the thermoelectric generating set after the low-pressure cylinder is cut off and transformed is PG,eAnd calculating corresponding maximum cogeneration heating power, wherein the corresponding calculation formula is as follows:
Figure FDA0002536501840000052
wherein, PE,eThe maximum generating power of the unit under the co-production working condition after the low-pressure cylinder is cut off is shown;
creating a thermoelectric unit heat supply capacity calculation model for cutting off the low-pressure cylinder and configuring the electric boiler to calculate the heat supply capacity of the thermoelectric unit for cutting off the low-pressure cylinder and configuring the electric boiler, namely for the thermoelectric unit after configuring the electric boiler, when the electric load borne by the thermoelectric unit is PG,eAnd calculating corresponding maximum cogeneration heating power, wherein the corresponding calculation formula is as follows:
Figure FDA0002536501840000061
wherein, PE,hThe maximum heat supply power under the co-production working condition of the unit is shown after the low-pressure cylinder is cut off; pG',h、PG,hRespectively shows that the unit is under the electric load P before and after the low-pressure cylinder is cut offG,eThe maximum cogeneration heating power; etaEBRepresenting the electric heating efficiency of the electric boiler; pB,hThe maximum heat supply power of the extraction condensing unit.
6. The system of claim 5, wherein the step of creating a total heating capacity model of all thermoelectric power generation units in the third model creation unit comprises:
firstly, setting a total heat supply capacity model objective function of all thermoelectric units, wherein the corresponding formula is as follows:
Figure FDA0002536501840000062
in the formula:
Figure FDA0002536501840000063
the overall heating power of the thermoelectric generator set l in the time period t,
Figure FDA0002536501840000064
the electric heating power of the electric boiler configured for the thermoelectric power unit l during the time period t,
Figure FDA0002536501840000065
for the first thermoelectric power unit, K is the preferential utilization coefficient of cogeneration heat supply, wherein
Figure FDA0002536501840000066
Figure FDA0002536501840000067
For all thermoelectric units c in the systemmThe maximum value of (a) is,
Figure FDA0002536501840000068
respectively the generating capacity and the on-line power of the wind power,
Figure FDA0002536501840000069
respectively for photovoltaic power generationElectric capacity and power on line, R is the preferential utilization coefficient of renewable energy sources, wherein
Figure FDA00025365018400000610
And T is the time period number of the system scheduling period.
Secondly, setting the total heat supply capacity model constraint conditions of all thermoelectric units, wherein the total heat supply capacity model constraint conditions comprise:
(1) the power balance constraint condition corresponds to the following formula:
Figure FDA00025365018400000611
in the formula:
Figure FDA00025365018400000612
respectively representing net input electric power, nuclear power generation power, hydroelectric power generation power, wind power on-line power, photovoltaic power generation on-line power, thermoelectric unit l power generation power and pure condensing unit k power generation power of the system at a time period t;
Figure FDA00025365018400000613
generating a load for the system;
Figure FDA00025365018400000614
the electric heating power of an electric boiler configured for the thermoelectric unit l in a time period t;
(2) the system capacity balance constraint condition corresponds to the formula:
Figure FDA00025365018400000615
in the formula:
Figure FDA0002536501840000071
the adjustable capacity of water and electricity in the time period t; x and y are credible capacity coefficients of wind power and photovoltaic power generation,
Figure FDA0002536501840000072
respectively the adjustable capacity, U, of the thermoelectric unit l and the straight condensing unit k in the time period tk,tThe start-stop state of the straight condensing unit in the time period t is shown;
Figure FDA0002536501840000073
the installed capacity of the straight condensing unit k; z is the rotational standby coefficient of the system;
(3) the operating interval constraint condition of the straight condensing unit is represented by the corresponding formula:
Figure FDA0002536501840000074
in the formula:
Figure FDA0002536501840000075
the minimum generating power of the straight condensing unit k is obtained;
(4) the start-stop constraint condition of the pure condensing unit keeps the start-stop state unchanged in the whole scheduling period T, and the corresponding formula is as follows:
Figure FDA0002536501840000076
(5) the constraint condition of the unit operation interval with the low-pressure cylinder flexible cutting capacity is that a corresponding formula of the unit l in a time period t is as follows:
Figure FDA0002536501840000077
in the formula: i isl,tThe starting and stopping state of the low-pressure cylinder is represented by 0, starting and stopping 1;
Figure FDA0002536501840000078
for co-production of heating power;
Figure FDA0002536501840000079
for combined production of heat supply power
Figure FDA00025365018400000710
A corresponding electrical power;
Figure FDA00025365018400000711
cutting off the electric power down-regulation value after the low pressure cylinder for the unit under the condition of unchanged steam inlet quantity;
Figure FDA00025365018400000712
respectively the power generation power and the heat supply power when the low-pressure cylinder is not cut off;
Figure FDA00025365018400000713
respectively the power generation power and the heat supply power when the low-pressure cylinder is cut off; peminRepresenting the unit and the minimum electric output under the pure condensing working condition; phminThe unit and the minimum thermal output under the co-production working condition are represented;
(6) the constraint condition of the adjustable capacity of the unit with the flexible cutting-off capability of the low-pressure cylinder corresponds to the following formula:
Figure FDA00025365018400000714
(7) the constraint condition of renewable energy output is represented by the following formula:
Figure FDA0002536501840000081
Figure FDA0002536501840000082
(8) the electric boiler capacity constraint condition is represented by the following formula:
Figure FDA0002536501840000083
in the formula:
Figure FDA0002536501840000084
the maximum capacity of the electric boiler allocated to the thermoelectric power unit l.
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