CN111898850B - Method and system for calculating heat supply capacity of electric heating comprehensive energy system of thermal power plant with flexibility - Google Patents
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Abstract
The embodiment of the invention discloses a method and a system for calculating the heat supply capacity of an electric heating comprehensive energy system of a thermal power plant with flexibility, wherein the method comprises the following steps: s1, creating a power generation load calculation model corresponding to a 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; s2, creating a new energy output calculation model corresponding to the thermal power plant with flexibility, wherein the new energy output calculation model can acquire 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 period according to the electric heating characteristics of the thermoelectric unit of the thermoelectric power plant; and S4, creating a total heat supply capacity model of all the 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. The invention can calculate the heat supply capacity of the electric heating comprehensive energy system of the flexible thermal power plant in each period, discloses the corresponding relation between the power generation and the heat supply of the electric heating comprehensive energy system of the flexible thermal power plant, and can provide reference for the heat supply planning of the provincial electric heating comprehensive energy system.
Description
Technical Field
The invention relates to the field of planning and design of electric power systems, in particular to a method and a system for calculating the heat supply capacity of an electric heating comprehensive energy system of a thermal power plant with flexibility.
Background
Under the condition of preferentially accepting renewable energy sources, the heat supply capacity of the thermal power plant after the flexibility is improved is calculated, and a reference can be provided for decision-making departments to make heat supply plans.
In recent years, the wind abandoning phenomenon caused by 'wind heat conflict' in the heating period in winter in the three North China is serious, and in order to solve the wind abandoning problem caused by 'wind heat conflict', the flexibility of a thermoelectric unit is actively improved in China, and the essence of the flexibility improvement is that the traditional thermoelectric power plant is changed into an 'electric heat fixing' operation mode from a 'electric heat fixing' operation mode, namely renewable energy sources are preferentially received, then the heat is supplied in a co-production mode according to the residual power generation space, and if the heat supply is insufficient in the co-production mode due to the insufficient power generation space, the heat supply is compensated in other modes. With the continuous increase of heating areas in China, under the condition that the current northern area has such serious wind heat burst, the heat supply requirement is hardly met only by the co-production heat supply of a thermoelectric unit, and more heat supply capacity is required to be excavated for a thermal power plant.
In order to reduce the electric output of the extraction condensing unit and improve the heat supply capacity of the unit, the flexible cutting technology of the low-pressure cylinder has been developed in recent years and has been applied to a plurality of thermal power plant transformation projects. When the traditional extraction condensing thermoelectric unit operates, at least about 5% -10% of steam needs to enter the low-pressure cylinder for working in order to ensure the stable operation of the low-pressure cylinder, and then the low-pressure cylinder is cooled in the condenser. In order to fully improve the co-production heating capacity of the unit and reduce the electric output of the unit, a low-pressure cylinder flexible cutting technology has been developed in recent years, and has been applied to a plurality of thermal power plant transformation projects. The technology can realize the on-line flexible cutting/putting-in of the low-pressure cylinder steam inlet operation (only a very small amount of cooling steam is kept). Before cutting, the unit operates in a pumping condensation working condition; after cutting, the steam exhausted by the medium pressure cylinder is basically completely extracted for heat supply, 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 of only the high pressure cylinder and the medium pressure cylinder. When the extraction condensing type thermoelectric unit is cut off from the low-pressure cylinder, the waste heat after the steam entering the steam turbine is processed is fully utilized, so that the co-production heat supply capacity is maximized under the condition of given electric load, and the continuous improvement is difficult.
Disclosure of Invention
Based on the method, in order to solve the defects existing in the prior art, a method for calculating the heat supply capacity of an electric heating comprehensive energy system of a thermal power plant with flexibility is particularly provided.
The method for calculating the heat supply capacity of the electric heating comprehensive energy system of the thermal power plant with flexibility is characterized by comprising the following steps of:
s1, creating a power generation load calculation model corresponding to a 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;
s2, creating a new energy output calculation model corresponding to the thermal power plant with flexibility, wherein the new energy output calculation model can acquire 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 period according to the electric heating characteristics of the thermoelectric unit of the thermoelectric power plant;
and S4, creating a total heat supply capacity model of all the 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 a user heat supply planning decision.
Optionally, in one embodiment, the step of calculating the heating capacity of the thermoelectric unit in S3 includes:
s31, creating a traditional thermoelectric unit heat supply capacity calculation model to calculate the heat supply capacity of the traditional steam extraction thermoelectric unit, namely when the electric load born by the traditional steam extraction thermoelectric unit is P G,e When the method is used, the corresponding maximum co-production heating power calculation formula is as follows:
wherein c v Generating power reduction values corresponding to heat supply per unit extraction unit under the condition of certain steam inflow for the steam extraction type thermoelectric unit; p (P) B,e The electric output is the corresponding electric output when the heat output of the thermoelectric unit is maximum; p (P) emax The maximum power of the steam extraction type unit under the pure condensation working condition is respectively; c m The electric heating ratio of the steam extraction type thermoelectric unit under the back pressure working condition; p (P) e0 The intersection point of the back pressure working condition operation line and the longitudinal axis of the steam extraction type thermoelectric unit;
s32, creating a calculation model of the heat supply capacity of the thermoelectric unit after the low-pressure cylinder is flexibly cut off so as to calculate the heat supply capacity of the thermoelectric unit after the low-pressure cylinder is flexibly cut off, namely, when the thermoelectric unit after the low-pressure cylinder is cut off and transformed is subjected to the electric load P G,e When the method is used, the corresponding maximum co-production heating power is calculated, and the corresponding calculation formula is as follows:
wherein P is E,e Representing the maximum power generation under the co-production working condition of the unit after the low-pressure cylinder is cut off;
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 thermoelectric unit heat supply capacity 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 born by the thermoelectric unit is P G,e When the method is used, the corresponding maximum co-production heating power is calculated, and the corresponding calculation formula is as follows:
wherein P is E,h Representing the maximum heating power of the unit under the co-production working condition after the low-pressure cylinder is cut off; p (P) G',h 、P G,h Respectively representing the maximum co-production heating power of the unit under the electric loads PG, e before and after the low-pressure cylinder is cut off; η (eta) EB Representing the electric heating efficiency of the electric boiler; p (P) B,h The maximum heating power of the extraction condensing unit.
Optionally, in one embodiment, the step of creating a total heat supply capability model of all thermoelectric units in S4 includes:
s41, setting a total heat supply capacity model of all thermoelectric units as an objective function, wherein the corresponding formula is as follows:
wherein:for the overall heating power of the thermoelectric unit l in the t period,/->Electric heating power of an electric boiler associated with a thermoelectric unit l in the t period, +.>For the first thermoelectric unit, K is the priority utilization coefficient of the cogeneration heat supply, wherein +.> For all thermoelectric units c in the system m Maximum value of>The power generation capacity and the internet power of wind power are respectively,the power generation capacity and the internet power of the photovoltaic power generation are respectively, R is the preferential utilization coefficient of renewable energy, whereinT is the time period number of the system scheduling period;
s42, setting constraint conditions of a total heat supply capacity model of all thermoelectric units, wherein the constraint conditions comprise:
(1) The power balance constraint condition corresponds to the formula:
wherein:the net power input power, the nuclear power generation power, the hydroelectric power generation power, the wind power internet power, the photovoltaic power generation internet power, the thermoelectric unit l power generation power and the pure condensing unit k power generation power of the system in the period t are respectively; />Generating a load for the system; />The electric heating power of the electric boiler configured for the thermoelectric unit l in the period t;
(2) The system capacity balance constraint condition corresponds to the formula:
wherein:the adjustable capacity of the water and electricity in the period t is achieved; x and y are the 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; />The adjustable capacities of the thermoelectric unit l and the pure condensing unit k in the t period are respectively U k,t The start-stop state of the pure condensing unit in the period t; />The installed capacity of the pure condensing unit k; z is the rotational reserve factor of the system;
(3) The operation interval constraint condition of the pure condensing unit corresponds to the formula:
wherein:the minimum power of the pure condensing unit k;
(4) The start-stop constraint condition of the pure condensing unit is that the start-stop state is kept unchanged in the whole dispatching period T, and the corresponding formula is as follows:
(5) The unit operation interval constraint condition with the flexible cutting capability of the low-pressure cylinder is that the corresponding formula of the unit l in the t period is as follows:
wherein: i l,t In a low-pressure cylinder start-stop state, 0 represents start-up and 1 represents stop;the heat supply power is co-produced; />For co-production of heating power +.>Corresponding electric power; />The electric power down-regulating value after the low-pressure cylinder is cut off under the condition that the steam inlet amount of the unit is unchanged; />The power generated when the low-pressure cylinder is not cut off and the heat supply power are respectively; />The power generated during cutting off of the low-pressure cylinder and the heat supply power are respectively; />Representing the unit and the minimum electric output under the pure coagulation working condition; p (P) hmin Representing a unit and minimum heat output under a co-production working condition;
(6) The unit adjustable capacity constraint condition with the flexible cutting capability of the low pressure cylinder corresponds to the formula:
(7) The renewable energy source output constraint condition corresponds to the formula:
(8) The capacity constraint condition of the electric boiler corresponds to the formula:
wherein:the maximum capacity of the electric boiler is allocated for the thermoelectric unit l.
In addition, in order to solve the defects existing in the traditional technology, a heating capacity computing system of an electric heating comprehensive energy system of a thermal power plant with flexibility is also provided.
A power supply capacity computing system for an electrothermal integrated energy system of a flexible thermal power plant, comprising:
a first model creation unit for creating a power generation load calculation model corresponding to the thermal power plant including flexibility, the power generation load calculation model being capable of acquiring a power generation load curve based on a power generation load per unit curve;
the second model creation unit is used for creating a new energy output calculation model corresponding to the flexible thermal power plant, and the new energy output calculation model can acquire a new energy power generation power curve based on a new energy power generation capacity per unit curve and installed capacity;
a first calculation unit for calculating the heating capacity of the thermoelectric unit in each period according to the electric heating characteristics of the thermoelectric unit of the thermoelectric power plant;
and the third model creation unit is used for 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 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 so as to provide reference data for a user heat supply planning decision.
Optionally, in one embodiment, the step of calculating the heating capacity of the thermoelectric unit in each period of time includes:
creating a traditional thermoelectric unit heat supply capacity calculation model to calculate the heat supply capacity of the traditional steam extraction thermoelectric unit, namely when the electric load born by the traditional steam extraction thermoelectric unit is P G,e When the method is used, the corresponding maximum co-production heating power calculation formula is as follows:
wherein c v Generating power reduction values corresponding to heat supply per unit extraction unit under the condition of certain steam inflow for the steam extraction type thermoelectric unit; p (P) B,e The electric output is the corresponding electric output when the heat output of the thermoelectric unit is maximum; p (P) emax The maximum power of the steam extraction type unit under the pure condensation working condition is respectively; c m The electric heating ratio of the steam extraction type thermoelectric unit under the back pressure working condition; p (P) e0 The intersection point of the back pressure working condition operation line and the longitudinal axis of the steam extraction type thermoelectric unit;
creating a calculation model of the heat supply capacity of the thermoelectric unit after the low-pressure cylinder is flexibly removed to calculate the heat supply capacity of the thermoelectric unit after the low-pressure cylinder is flexibly removed, namely, when the thermoelectric unit after the low-pressure cylinder is removed and transformed is subjected to the electric load P G,e When the method is used, the corresponding maximum co-production heating power is calculated, and the corresponding calculation formula is as follows:
wherein P is E,e Representing the maximum power generation under the co-production working condition of the unit after the low-pressure cylinder is cut off;
creating a thermoelectric unit heat supply capacity calculation model for cutting off the low-pressure cylinder and configuring the electric boiler to calculate the thermoelectric unit heat supply capacity 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 born by the thermoelectric unit is P G,e When the method is used, the corresponding maximum combined heat supply power is calculated, and the corresponding calculation is performed
The formula is:
wherein P is E,h Representing the maximum heating power of the unit under the co-production working condition after the low-pressure cylinder is cut off; p (P) G',h 、P G,h Respectively showing the electric load P of the unit before and after the low-pressure cylinder is cut off G,e The maximum co-production heating power is obtained; η (eta) EB Representing the electric heating efficiency of the electric boiler; p (P) B,h Is a drawing-condensing machineMaximum heating power of the group.
Optionally, in one embodiment, the step of creating a total heat supply capability model of all thermoelectric 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:
wherein:for the overall heating power of the thermoelectric unit l in the t period,/->Electric heating power of an electric boiler associated with a thermoelectric unit l in the t period, +.>For the first thermoelectric unit, K is the priority utilization coefficient of the cogeneration heat supply, wherein +.> For all thermoelectric units c in the system m Maximum value of>The power generation capacity and the internet power of wind power are respectively,the power generation capacity and the internet power of the photovoltaic power generation are respectively, R is the preferential utilization coefficient of renewable energy, whereinT is system adjustmentNumber of time periods of the degree period.
Secondly, setting the constraint condition of a total heat supply capacity model of all thermoelectric units, wherein the constraint condition comprises the following steps:
(1) The power balance constraint condition corresponds to the formula:
wherein:the net power input power, the nuclear power generation power, the hydroelectric power generation power, the wind power internet power, the photovoltaic power generation internet power, the thermoelectric unit l power generation power and the pure condensing unit k power generation power of the system in the period t are respectively; />Generating a load for the system; />The electric heating power of the electric boiler configured for the thermoelectric unit l in the period t;
(2) The system capacity balance constraint condition corresponds to the formula:
wherein:the adjustable capacity of the water and electricity in the period t is achieved; x and y are the credible capacity coefficients of wind power and photovoltaic power generation, namely, the credible capacity coefficients are determined according to the lower boundaries of wind power and photovoltaic prediction intervals; />The adjustable capacities of the thermoelectric unit l and the pure condensing unit k in the t period are respectively U k,t The start-stop state of the pure condensing unit in the period t; />The installed capacity of the pure condensing unit k; z is the rotational reserve factor of the system;
(3) The operation interval constraint condition of the pure condensing unit corresponds to the formula:
wherein:the minimum power of the pure condensing unit k;
(4) The start-stop constraint condition of the pure condensing unit is that the start-stop state is kept unchanged in the whole dispatching period T, and the corresponding formula is as follows:
(5) The unit operation interval constraint condition with the flexible cutting capability of the low-pressure cylinder is that the corresponding formula of the unit l in the t period is as follows:
wherein: i l,t In a low-pressure cylinder start-stop state, 0 represents start-up and 1 represents stop;the heat supply power is co-produced; />For co-production of heating power +.>Corresponding electric power; />The electric power down-regulating value after the low-pressure cylinder is cut off under the condition that the steam inlet amount of the unit is unchanged; />The power generated when the low-pressure cylinder is not cut off and the heat supply power are respectively; />The power generated during cutting off of the low-pressure cylinder and the heat supply power are respectively; p (P) emin Representing the unit and the minimum electric output under the pure coagulation working condition; p (P) hmin Representing a unit and minimum heat output under a co-production working condition;
(6) The unit adjustable capacity constraint condition with the flexible cutting capability of the low pressure cylinder corresponds to the formula:
(7) The renewable energy source output constraint condition corresponds to the formula:
(8) The capacity constraint condition of the electric boiler corresponds to the formula:
wherein:the maximum capacity of the electric boiler is allocated for the thermoelectric unit l.
The implementation of 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 flexible thermal power plant in each period, can reveal the corresponding relation between the power generation and the heat supply of the electric heating comprehensive energy system of the flexible thermal power plant, and can provide reference data for the heat supply planning of the provincial electric heating comprehensive energy system.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Wherein:
FIG. 1 is a flow chart of steps corresponding to the method of the present invention;
FIG. 2 is a graph of power generation load during a heating period in one embodiment;
FIG. 3 is a graph of wind power per unit during heating in accordance with one embodiment;
FIG. 4 is a graph showing the power per unit of photovoltaic power during a heating period according to one embodiment;
FIG. 5 is a diagram showing the power balance of a heat electric motor set after the heat electric motor set is configured with an electric boiler in one embodiment;
FIG. 6 is a graph showing the heat capacity of the system before and after the unit is modified in one embodiment.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of 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 herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It will be understood that the terms first, second, etc. as used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. 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. Both the first element and the second element are elements, but they are not the same element.
On the basis of the flexible cutting technology of the low-pressure cylinder, the heat supply level can be improved on the premise of further meeting the power output by adding the electric boiler to the thermoelectric unit and converting the surplus power caused by electric heating coupling into heat energy by utilizing the electric boiler; in addition, as the electric load born by the thermoelectric unit is smaller after the electric boiler is configured, the total heat supply capacity is larger, 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 thermoelectric plant after the electric boiler is configured can simultaneously meet the requirements of new energy source elimination at the power system side and clean energy source heat supply ratio improvement at the heat supply system side, and the thermoelectric plant is an effective means for realizing the collaborative development of the new energy source elimination at the power system side and the clean energy source heat supply ratio improvement at the heat supply system side. The invention can calculate the heat supply capacity of the electric heating comprehensive energy system of the thermal power plant with flexibility, help a planning decision maker to excavate the heat supply capacity of the thermal power plant and provide reference data for heat supply planning decisions.
Based on the above objective, in this embodiment, a method for calculating the heat supply capacity of an electric heating integrated energy system of a thermal power plant with flexibility is specifically provided, which selects certain day data in a heating period, and clearly and completely describes 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 a 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 a system per hour, and a specific curve is automatically 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 in fig. 2, the maximum load may be set at 3803MW and the minimum load may be 2253MW; s2, creating a new energy output calculation model corresponding to the thermal power plant with flexibility, wherein the new energy output calculation model can be based on a new energy power generation capacity per unit curve and installed capacity, so that a new energy power generation power curve, namely, the new energy power generation capacity per unit curve multiplied by the installed capacity is obtained, and a new energy power generation power curve per hour is obtained, as shown in fig. 3-4, a specific curve is automatically built 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 period according to the electric heating characteristics of the thermoelectric unit of the thermoelectric 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 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 a user heat supply planning decision; the index data includes at least a persistence curve characterizing the overall system heat supply capacity, probability distribution, guaranteed capacity for a given confidence level, and so forth.
In some specific embodiments, the step of calculating the heating capacity of the thermoelectric unit in S3 includes:
s31, creating a traditional thermoelectric unit heat supply capacity calculation model to calculate the heat supply capacity of the traditional steam extraction thermoelectric unit, namely when the electric load born by the traditional steam extraction thermoelectric unit is P G,e When corresponding to maximum
The calculation formula of the co-production heating power is as follows:
wherein c v Generating power reduction values corresponding to heat supply per unit extraction unit under the condition of certain steam inflow for the steam extraction type thermoelectric unit; p (P) B,e The electric output is the corresponding electric output when the heat output of the thermoelectric unit is maximum; p (P) emax Respectively the maximum of the steam extraction type unit under the pure condensation working conditionGenerating power; c m The electric heating ratio of the steam extraction type thermoelectric unit under the back pressure working condition; p (P) e0 The intersection point of the back pressure working condition operation line and the longitudinal axis of the steam extraction type thermoelectric unit;
s32, creating a calculation model of the heat supply capacity of the thermoelectric unit after the low-pressure cylinder is flexibly cut off so as to calculate the heat supply capacity of the thermoelectric unit after the low-pressure cylinder is flexibly cut off, namely, when the thermoelectric unit after the low-pressure cylinder is cut off and transformed is subjected to the electric load P G,e When the method is used, the corresponding maximum co-production heating power is calculated, and the corresponding calculation formula is as follows:
wherein P is E,e And (5) representing the maximum power generation under the co-production working condition of the unit after the low-pressure cylinder is cut off.
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 thermoelectric unit heat supply capacity 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 born by the thermoelectric unit is P G,e When the method is used, the corresponding maximum co-production heating power is calculated, and the corresponding calculation formula is as follows:
wherein P is E,h Representing the maximum heating power of the unit under the co-production working condition after the low-pressure cylinder is cut off; p (P) G',h 、P G,h Respectively showing the electric load P of the unit before and after the low-pressure cylinder is cut off G,e The maximum co-production heating power is obtained; η (eta) EB Representing the electric heating efficiency of the electric boiler; p (P) B,h The specific calculation results are shown in table 1 for the maximum heating power of the extraction condensing unit.
Table 1 set parameters
In some specific embodiments, as shown in fig. 4-5, the purpose of S4 is to calculate the maximum heat supply capacity of the system under the condition of preferentially accepting renewable energy sources, that is, based on the power structure of the system and the heat supply capacity of each thermoelectric unit, under the condition of preferentially accepting renewable energy sources, taking the power balance of the power system side as a constraint and taking the heat supply capacity of the heat supply system side as the maximum target, establish a total heat supply capacity model for calculating all thermoelectric units of the whole system, and calculate the total heat supply capacity of all thermoelectric units of the whole system time-interval. Specifically, the corresponding step of creating a total heat supply capacity model of all thermoelectric units includes:
s41, because the thermoelectric unit always preferentially utilizes the power generator to co-produce heat supply, the electric boiler can be used for heat supply by utilizing the residual capacity of the unit boiler; the total supply of all thermoelectric units is correspondingly set
The thermal capability model objective function corresponds to the formula:
wherein:for the overall heating power of the thermoelectric unit l in the t period,/->Electric heating power of an electric boiler associated with a thermoelectric unit l in the t period, +.>For the first thermoelectric unit, K is the priority utilization coefficient of the cogeneration heat supply, wherein +.> For all thermoelectric units c in the system m Maximum value of (2)，
Wind power generation capacity and Internet surfing power respectively, < ->The power generation capacity and the internet power of the photovoltaic power generation are respectively, R is a preferential utilization coefficient of renewable energy, wherein +.>T is the number of periods of the system scheduling period.
S42, setting constraint conditions of a total heat supply capacity model of all thermoelectric units, wherein the constraint conditions comprise:
(1) The power balance constraint condition corresponds to the formula:
wherein:the net power input power, the nuclear power generation power, the hydroelectric power generation power, the wind power internet power, the photovoltaic power generation internet power, the thermoelectric unit l power generation power and the pure condensing unit k power generation power of the system in the period t are respectively; />Generating a load for the system; />The electric heating power of the electric boiler configured for the thermoelectric unit l in the period t;
(2) The system capacity balance constraint condition corresponds to the formula:
wherein:the adjustable capacity of the water and electricity in the period t is achieved; x and y are credible capacity coefficients of wind power and photovoltaic power generation and can be determined according to the lower boundary of a prediction interval; />The adjustable capacities of the thermoelectric unit l and the pure condensing unit k in the t period are respectively U k,t The start-stop state of the pure condensing unit in the period t; />The installed capacity of the pure condensing unit k; z is the rotational reserve factor of the system;
(3) The operation interval constraint condition of the pure condensing unit corresponds to the formula:
wherein:the minimum power of the pure condensing unit k;
(4) The start-stop constraint condition of the pure condensing unit is that the start-stop state is kept unchanged in the whole dispatching period T, and the corresponding formula is as follows:
(5) The unit operation interval constraint condition with the flexible cutting capability of the low-pressure cylinder is that the corresponding formula of the unit l in the t period is as follows:
wherein: i l,t Is low inThe cylinder is started and stopped, 0 represents starting up and 1 represents stopping;the heat supply power is co-produced; />The electric power down-regulating value after the low-pressure cylinder is cut off under the condition that the steam inlet amount of the unit is unchanged; />The power generated when the low-pressure cylinder is not cut off and the heat supply power are respectively; />The power generated during cutting off of the low-pressure cylinder and the heat supply power are respectively;
(6) The unit adjustable capacity constraint condition with the flexible cutting capability of the low pressure cylinder corresponds to the formula:
(7) The renewable energy source output constraint condition corresponds to the formula:
(8) The capacity constraint condition of the electric boiler corresponds to the formula:
wherein:the maximum capacity of the electric boiler is allocated for the thermoelectric unit l.
Based on the above-described fig. 5-6, the following information can be obtained by the above-described set constraint conditions: in the period of insufficient power generation space, the heat supply output of the unit is in direct proportion to the power generation space; in the period of abundant power generation space, if the adjustable capacity of the system is abundant, the thermoelectric unit can operate with maximum heat supply output, and if the adjustable capacity of the system is insufficient, the thermoelectric unit can reduce the heat supply output; meanwhile, the lower the co-production heat supply output is, the more the heat supply quantity is increased after the electric boiler is utilized, and the total heat supply capacity is inversely proportional to the on-line power generation space of the power plant; and along with the reduction of the minimum output rate of the pure condensing unit, the heat supply capacity of the system under the scheme of unmodified and low-pressure cylinder cutting and reconstruction is improved, and the heat supply capacity under the scheme of low-pressure cylinder cutting and reconstruction and electric boiler configuration is reduced.
In addition, in order to solve the defects existing in the traditional technology, a heating capacity computing system of an electric heating comprehensive energy system of a thermal power plant with flexibility is also provided.
A power supply capacity computing system for an electrothermal integrated energy system of a flexible thermal power plant, comprising:
a first model creation unit for creating a power generation load calculation model corresponding to the thermal power plant including flexibility, the power generation load calculation model being capable of acquiring a power generation load curve based on a power generation load per unit curve;
the second model creation unit is used for creating a new energy output calculation model corresponding to the flexible thermal power plant, and the new energy output calculation model can acquire a new energy power generation power curve based on a new energy power generation capacity per unit curve and installed capacity;
a first calculation unit for calculating the heating capacity of the thermoelectric unit in each period according to the electric heating characteristics of the thermoelectric unit of the thermoelectric power plant;
and a third model creation unit for 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 thermoelectric units of the entire system on a period-by-period basis.
In some specific embodiments, the step of calculating the heating capacity of the thermoelectric unit in each period of time in the first calculation unit includes:
creating a traditional thermoelectric unit heat supply capacity calculation model to calculate the heat supply capacity of the traditional steam extraction thermoelectric unit, namely when the electric load born by the traditional steam extraction thermoelectric unit is P G,e Corresponding maximum co-production
The heat supply power calculation formula is:
wherein c v Generating power reduction values corresponding to heat supply per unit extraction unit under the condition of certain steam inflow for the steam extraction type thermoelectric unit; c m The electric heating ratio of the steam extraction type thermoelectric unit under the back pressure working condition;the minimum power generation and the maximum power generation of the steam extraction type unit under the pure condensation working condition are respectively; />Respectively the minimum heating power and the maximum heating power of the steam extraction type unit under the co-production working condition, P e0 The intersection point of the back pressure working condition operation line and the longitudinal axis of the steam extraction type thermoelectric unit;
creating a calculation model of the heat supply capacity of the thermoelectric unit after the low-pressure cylinder is flexibly removed to calculate the heat supply capacity of the thermoelectric unit after the low-pressure cylinder is flexibly removed, namely, when the thermoelectric unit after the low-pressure cylinder is removed and transformed is subjected to the electric load P G,e When the method is used, the corresponding maximum co-production heating power is calculated, and the corresponding calculation formula is as follows:
creating a thermoelectric unit heat supply capacity calculation model of the cut-off low pressure cylinder and configuring the electric boiler to calculate the cut-off low pressure cylinder and configuringThe heat supply capacity of the thermoelectric unit of the electric boiler, namely, when the electric load born by the thermoelectric unit after the electric boiler is arranged is P G,e When the method is used, the corresponding maximum co-production heating power is calculated, and the corresponding calculation formula is as follows:
in some specific embodiments, the step of creating the total heat supply capacity model of all thermoelectric 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:
wherein:for the overall heating power of the thermoelectric unit l in the t period,/->Electric heating power of an electric boiler associated with a thermoelectric unit l in the t period, +.>For the first thermoelectric unit, K is the priority utilization coefficient of the cogeneration heat supply, wherein +.> For all thermoelectric units c in the system m Maximum value of>The power generation capacity and the internet power of wind power are respectively,the power generation capacity and the internet power of the photovoltaic power generation are respectively, R is the preferential utilization coefficient of renewable energy, whereinT is the number of periods of the system scheduling period.
Secondly, setting the constraint condition of a total heat supply capacity model of all thermoelectric units, wherein the constraint condition comprises the following steps:
(1) The power balance constraint condition corresponds to the formula:
wherein:the net power input power, the nuclear power generation power, the hydroelectric power generation power, the wind power internet power, the photovoltaic power generation internet power, the thermoelectric unit l power generation power and the pure condensing unit k power generation power of the system in the period t are respectively; />Generating a load for the system; />The electric heating power of the electric boiler configured for the thermoelectric unit l in the period t;
(2) The system capacity balance constraint condition corresponds to the formula:
wherein:the adjustable capacity of the water and electricity in the period t is achieved; x and y are wind power and photovoltaic power generationThe information capacity coefficient is determined according to the lower boundary of the wind power and photovoltaic prediction interval; />The adjustable capacities of the thermoelectric unit l and the pure condensing unit k in the t period are respectively U k,t The start-stop state of the pure condensing unit in the period t; />The installed capacity of the pure condensing unit k; z is the rotational reserve factor of the system;
(3) The operation interval constraint condition of the pure condensing unit corresponds to the formula:
wherein:the minimum power of the pure condensing unit k;
(4) The start-stop constraint condition of the pure condensing unit is that the start-stop state is kept unchanged in the whole dispatching period T, and the corresponding formula is as follows:
(5) The unit operation interval constraint condition with the flexible cutting capability of the low-pressure cylinder is that the corresponding formula of the unit l in the t period is as follows:
wherein: i l,t In a low-pressure cylinder start-stop state, 0 represents start-up and 1 represents stop;the heat supply power is co-produced; />For co-production of heating power +.>Corresponding electric power; />The electric power down-regulating value after the low-pressure cylinder is cut off under the condition that the steam inlet amount of the unit is unchanged; />The power generated when the low-pressure cylinder is not cut off and the heat supply power are respectively; />The power generated during cutting off of the low-pressure cylinder and the heat supply power are respectively; p (P) emin Representing the unit and the minimum electric output under the pure coagulation working condition; p (P) hmin Representing a unit and minimum heat output under a co-production working condition;
(6) The unit adjustable capacity constraint condition with the flexible cutting capability of the low pressure cylinder corresponds to the formula:
(7) The renewable energy source output constraint condition corresponds to the formula:
(8) The capacity constraint condition of the electric boiler corresponds to the formula:
wherein:the maximum capacity of the electric boiler is allocated for the thermoelectric unit l.
As can be seen from the above, the invention essentially discloses a method for calculating the heat supply capacity of an electric heating comprehensive energy system of a thermal power plant with flexibility, which realizes the calculation of the heat supply capacity of the system after flexibly cutting off a low-pressure cylinder of a thermoelectric unit and adding an electric boiler, and based on system parameters, simulates a time sequence curve of the maximum heat supply power of the system from an initial moment by time intervals according to electric power balance and combining related constraint conditions; meanwhile, based on the curve, various indexes representing the whole maximum heating power, the heating capacity of the system and the like, such as a continuous curve, probability distribution, guaranteed capacity under given confidence coefficient and the like, are constructed to help a planning decision maker to mine the heating capacity of the thermal power plant and provide references for heating planning decisions.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (2)
1. The method for calculating the heat supply capacity of the electric heating comprehensive energy system of the thermal power plant with flexibility is characterized by comprising the following steps of:
s1, creating a power generation load calculation model corresponding to a 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;
s2, creating a new energy output calculation model corresponding to the thermal power plant with flexibility, wherein the new energy output calculation model can acquire 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 period according to the electric heating characteristics of the thermoelectric unit of the thermoelectric 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 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 a user heat supply planning decision; the step of calculating the heating capacity of the thermoelectric unit in each period in S3 includes:
s31, creating a traditional thermoelectric unit heat supply capacity calculation model to calculate the heat supply capacity of the traditional steam extraction thermoelectric unit, namely when the electric load born by the traditional steam extraction thermoelectric unit is P G,e When the method is used, the corresponding maximum co-production heating power calculation formula is as follows:
wherein c v Generating power reduction values corresponding to heat supply per unit extraction unit under the condition of certain steam inflow for the steam extraction type thermoelectric unit; c m The electric heating ratio of the steam extraction type thermoelectric unit under the back pressure working condition; p (P) B,e The electric output is the corresponding electric output when the heat output of the thermoelectric unit is maximum; p (P) emax The minimum power generation and the maximum power generation of the steam extraction type unit under the pure condensation working condition are respectively; p (P) e0 The intersection point of the back pressure working condition operation line and the longitudinal axis of the steam extraction type thermoelectric unit;
s32, creating a calculation model of the heat supply capacity of the thermoelectric unit after the low-pressure cylinder is flexibly cut off so as to calculate the heat supply capacity of the thermoelectric unit after the low-pressure cylinder is flexibly cut off, namely, when the thermoelectric unit after the low-pressure cylinder is cut off and transformed is subjected to the electric load P G,e When the method is used, the corresponding maximum co-production heating power is calculated, and the corresponding calculation formula is as follows:
wherein P is E,e Representing the maximum power generation under the co-production working condition of the unit after the low-pressure cylinder is cut off;
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 thermoelectric unit heat supply capacity 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 born by the thermoelectric unit is P G,e When the method is used, the corresponding maximum co-production heating power is calculated, and the corresponding calculation formula is as follows:
wherein P is E,h Representing the maximum heating power of the unit under the co-production working condition after the low-pressure cylinder is cut off; p (P) G',h 、P G,h Respectively showing the electric load P of the unit before and after the low-pressure cylinder is cut off G,e The maximum co-production heating power is obtained; η (eta) EB Representing the electric heating efficiency of the electric boiler; p (P) B,h The maximum heating power of the extraction condensing unit; the step of creating a total heat supply capacity model of all thermoelectric units in S4 includes:
s41, setting an objective function of a total heat supply capacity model of all thermoelectric units, wherein the corresponding formula is as follows:
wherein:for the overall heating power of the thermoelectric unit l in the t period,/->Electric heating power of an electric boiler associated with a thermoelectric unit l in the t period, +.>For the first thermoelectric unit, K is the priority utilization coefficient of the cogeneration heat supply, wherein +.> For all thermoelectric units c in the system m Maximum value of>The power generation capacity and the internet power of wind power are respectively,the power generation capacity and the internet power of the photovoltaic power generation are respectively, R is the preferential utilization coefficient of renewable energy, whereinT is the time period number of the system scheduling period;
s42, setting constraint conditions of a total heat supply capacity model of all thermoelectric units, wherein the constraint conditions comprise:
(1) The power balance constraint condition corresponds to the formula:
wherein:the net power input power, the nuclear power generation power, the hydroelectric power generation power, the wind power internet power, the photovoltaic power generation internet power, the thermoelectric unit l power generation power and the pure condensing unit k power generation power of the system in the period t are respectively; />Generating a load for the system; />The electric heating power of the electric boiler configured for the thermoelectric unit l in the period t;
(2) The system capacity balance constraint condition corresponds to the formula:
wherein:the adjustable capacity of the water and electricity in the period t is achieved; x and y are the credible capacity coefficients of wind power and photovoltaic power generation;the adjustable capacities of the thermoelectric unit l and the pure condensing unit k in the t period are respectively U k,t The start-stop state of the pure condensing unit in the period t; />The installed capacity of the pure condensing unit k; z is the rotational reserve factor of the system;
(3) The operation interval constraint condition of the pure condensing unit corresponds to the formula:
wherein:the minimum power of the pure condensing unit k;
(4) The start-stop constraint condition of the pure condensing unit keeps the start-stop state unchanged in the whole dispatching period T, and the corresponding formula is as follows:
(5) The unit operation interval constraint condition with the flexible cutting capability of the low-pressure cylinder is that the corresponding formula of the unit l in the t period is as follows:
wherein: i l,t In a low-pressure cylinder start-stop state, 0 represents start-up and 1 represents stop;the heat supply power is co-produced; />For co-production of heating power +.>Corresponding electric power; />The electric power down-regulating value after the low-pressure cylinder is cut off under the condition that the steam inlet amount of the unit is unchanged; />The power generated when the low-pressure cylinder is not cut off and the heat supply power are respectively; />The power generated during cutting off of the low-pressure cylinder and the heat supply power are respectively; />Representing the unit and the minimum electric output under the pure coagulation working condition; />Representing the minimum heat output of the unit under the co-production working condition;
(6) The unit adjustable capacity constraint condition with the flexible cutting capability of the low pressure cylinder corresponds to the formula:
(7) The renewable energy source output constraint condition corresponds to the formula:
(8) The capacity constraint condition of the electric boiler corresponds to the formula:
wherein:the maximum capacity of the electric boiler is allocated for the thermoelectric unit l.
2. A power supply capacity computing system for an electrothermal integrated energy system of a flexible thermal power plant, comprising:
a first model creation unit for creating a power generation load calculation model corresponding to the thermal power plant including flexibility, the power generation load calculation model being capable of acquiring a power generation load curve based on a power generation load per unit curve;
the second model creation unit is used for creating a new energy output calculation model corresponding to the flexible thermal power plant, and the new energy output calculation model can acquire a new energy power generation power curve based on a new energy power generation capacity per unit curve and installed capacity;
a first calculation unit for calculating the heating capacity of the thermoelectric unit in each period according to the electric heating characteristics of the thermoelectric unit of the thermoelectric power plant;
a third model creation unit for creating a total heat supply capacity model of all thermoelectric units of the thermal power plant to calculate total heat supply capacities of all thermoelectric units of the whole system period by period and obtaining index data representing the heat supply capacities of the whole system based on the total heat supply capacities to provide reference data for a user heat supply planning decision; the step of calculating the heating capacity of the thermoelectric unit in each period in the first calculation unit comprises the following steps:
creating a traditional thermoelectric unit heat supply capacity calculation model to calculate the heat supply capacity of the traditional steam extraction thermoelectric unit, namely when the electric load born by the traditional steam extraction thermoelectric unit is P G,e When the method is used, the corresponding maximum co-production heating power calculation formula is as follows:
wherein c v Generating power reduction values corresponding to heat supply per unit extraction unit under the condition of certain steam inflow for the steam extraction type thermoelectric unit; c m The electric heating ratio of the steam extraction type thermoelectric unit under the back pressure working condition; p (P) B,e The electric output is the corresponding electric output when the heat output of the thermoelectric unit is maximum; p (P) emax The maximum power of the steam extraction type unit under the pure condensation working condition is respectively; p (P) e0 The intersection point of the back pressure working condition operation line and the longitudinal axis of the steam extraction type thermoelectric unit;
creating a calculation model of the heat supply capacity of the thermoelectric unit after the low-pressure cylinder is flexibly removed to calculate the heat supply capacity of the thermoelectric unit after the low-pressure cylinder is flexibly removed, namely, when the thermoelectric unit after the low-pressure cylinder is removed and transformed is subjected to the electric load P G,e When the method is used, the corresponding maximum co-production heating power is calculated, and the corresponding calculation formula is as follows:
wherein P is E,e Representing the maximum power generation under the co-production working condition of the unit after the low-pressure cylinder is cut off;
creating a thermoelectric unit heat supply capacity calculation model for cutting off the low-pressure cylinder and configuring the electric boiler to calculate the thermoelectric unit heat supply capacity 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 born by the thermoelectric unit is P G,e When calculatingThe corresponding maximum co-production heating power is obtained, and the corresponding calculation formula is as follows:
wherein P is E,h Representing the maximum heating power of the unit under the co-production working condition after the low-pressure cylinder is cut off; p (P) G',h 、P G,h Respectively showing the electric load P of the unit before and after the low-pressure cylinder is cut off G,e The maximum co-production heating power is obtained; η (eta) EB Representing the electric heating efficiency of the electric boiler; p (P) B,h The maximum heating power of the extraction condensing unit; the step of creating a total heat supply capacity model of all thermoelectric 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:
wherein:for the overall heating power of the thermoelectric unit l in the t period,/->Electric heating power of an electric boiler associated with a thermoelectric unit l in the t period, +.>For the first thermoelectric unit, K is the priority utilization coefficient of the cogeneration heat supply, wherein +.> For all thermoelectric units c in the system m Maximum value of>The power generation capacity and the internet power of wind power are respectively,the power generation capacity and the internet power of the photovoltaic power generation are respectively, R is the preferential utilization coefficient of renewable energy, whereinT is the time period number of the system scheduling period;
secondly, setting the constraint condition of a total heat supply capacity model of all thermoelectric units, wherein the constraint condition comprises the following steps:
(1) The power balance constraint condition corresponds to the formula:
wherein:the net power input power, the nuclear power generation power, the hydroelectric power generation power, the wind power internet power, the photovoltaic power generation internet power, the thermoelectric unit l power generation power and the pure condensing unit k power generation power of the system in the period t are respectively; />Generating a load for the system; />The electric heating power of the electric boiler configured for the thermoelectric unit l in the period t;
(2) The system capacity balance constraint condition corresponds to the formula:
wherein:the adjustable capacity of the water and electricity in the period t is achieved; x and y are the credible capacity coefficients of wind power and photovoltaic power generation,the adjustable capacities of the thermoelectric unit l and the pure condensing unit k in the t period are respectively U k,t The start-stop state of the pure condensing unit in the period t; />The installed capacity of the pure condensing unit k; z is the rotational reserve factor of the system;
(3) The operation interval constraint condition of the pure condensing unit corresponds to the formula:
wherein:the minimum power of the pure condensing unit k;
(4) The start-stop constraint condition of the pure condensing unit is that the start-stop state is kept unchanged in the whole dispatching period T, and the corresponding formula is as follows:
(5) The unit operation interval constraint condition with the flexible cutting capability of the low-pressure cylinder is that the corresponding formula of the unit l in the t period is as follows:
wherein: i l,t In a low-pressure cylinder start-stop state, 0 represents start-up and 1 represents stop;the heat supply power is co-produced; />For co-production of heating power +.>Corresponding electric power; />The electric power down-regulating value after the low-pressure cylinder is cut off under the condition that the steam inlet amount of the unit is unchanged; />The power generated when the low-pressure cylinder is not cut off and the heat supply power are respectively; />The power generated during cutting off of the low-pressure cylinder and the heat supply power are respectively; p (P) emin Representing the unit and the minimum electric output under the pure coagulation working condition; p (P) hmin Representing a unit and minimum heat output under a co-production working condition;
(6) The constraint condition of the adjustable capacity of the unit with the flexible cutting capability of the low-pressure cylinder corresponds to the formula:
(7) The constraint condition of renewable energy output is that the corresponding formula is:
(8) The capacity constraint condition of the electric boiler corresponds to the formula:
wherein:the maximum capacity of the electric boiler is allocated for the thermoelectric unit l.
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