CN110474335A - A kind of integrated energy system operation method based on interpretational criteria - Google Patents
A kind of integrated energy system operation method based on interpretational criteria Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The invention discloses a kind of integrated energy system operation method based on interpretational criteria initially sets up the purchase of electricity and fuel consumption calculated point for system model point for system；Then the integrated energy system model for establishing " electricity determining by heat " and " with the fixed heat of electricity " both of which, calculates separately the purchase of electricity and fuel consumption of integrated energy system；Establish three evaluation indexes of system: primary energy consumption, operating cost, CO2Emission reduction, comprehensive three Index Establishment comprehensive evaluation indexs determine the method for operation of integrated energy system by calculating the applicable elements of cold and hot two kinds of the electric system main methods of operation, the utilization rate for enabling the system to source is optimal, more more economical and energy saving than with electric fixed heat and the electricity determining by heat method of operation.Very good solution of the present invention due to the randomness of load and the part throttle characteristics of unit are inconsistent cause using a certain method of operation when result in waste of resources the problem of.
Description
Technical Field
The invention belongs to the field of combined cooling heating and power systems, and particularly relates to an evaluation criterion-based operation method of a comprehensive energy system.
Background
An Integrated Energy System (IES) has the characteristics of modularization and decentralization, is a high-efficiency and reliable energy conversion unit arranged around a user side, and a power supply of the IES mainly comprises an internal combustion engine, a micro gas turbine, photovoltaic power generation, wind power generation, biomass power generation and the like, so that the IES can realize near power generation, near grid connection, near conversion and near use of scattered energy, and effectively improve the comprehensive utilization of energy. The development of the comprehensive energy system breaks through the traditional energy system architecture, becomes an important link for linking the energy production links of various forms to the energy consumption links of terminal users, and creates a good technical support platform and a resource allocation center for the coordinated operation and advantage complementation among various energy sources.
The combined cooling heating and power system is a comprehensive energy system with the most potential and prospect, is a comprehensive energy production and energy utilization distributed system established on the basis of energy gradient utilization, is usually installed near an end user end, firstly utilizes primary energy to drive an engine to generate electricity, and then recycles waste heat through various waste heat utilization devices, thereby simultaneously providing power, refrigeration, heating, domestic hot water and the like for users. The operation mode of the comprehensive energy system containing combined supply of cold, heat and electricity mainly comprises a power supply with fixed heat (FEL) and a power supply with fixed heat (FTL). The method comprises the following steps of firstly meeting the heat requirement (cold and hot load) of a system in a heat power ordering mode, determining the power output of the system through a thermoelectric ratio, and meeting the shortage of power by purchasing power from a large power grid; the electric heating mode is used for firstly meeting the power requirement of the system, so that the heat output of the system is determined, and the insufficient heat is supplied by the afterburning boiler. For a combined cooling heating and power system, when the load demand thermoelectric ratio is the same as that of a generator set, the utilization rate of energy is optimal, but the load randomness and the partial load characteristics of the generator set cause inconsistency, and resource waste is caused when a certain operation mode is adopted.
Disclosure of Invention
The invention provides an evaluation criterion-based operation method of a comprehensive energy system, which is characterized in that when the evaluation criterion is fixed, the economical efficiency and the environmental protection property of the operation of the comprehensive energy system are improved by calculating the applicable conditions of two main operation modes of a cooling, heating and power system.
In order to solve the technical problem, the comprehensive energy system operation method based on the evaluation criterion comprises the following steps:
step 10) establishing a model of a sub-supply System (SP), firstly determining the power consumption of the electric refrigerator as follows:
in the formula, COPecRepresenting the coefficient of performance, P, of the electric refrigeratorecRepresents the input power of the electric refrigerator, unit: kW; qCLRepresents the system cooling load, unit: kW.
The fuel consumed by the boiler is then determined as:
in the formula, FboilerNatural gas, which represents the consumption of a gas boiler, unit: cubic meter; qrhRepresents heat exchanger input heat, in units: kW; η SP builder represents the efficiency of the gas boiler.
Then, determining that the power purchased by the power grid is as follows:
Pgrid＝PEL+Pec (3)
in the formula, PgridRepresenting the amount of electricity purchased from the grid, in units: kW; pELIs the electrical load of the system, unit: kW.
The fuel consumed by the system is then determined, only the gas boiler consuming:
Fm＝Fboiler (4)
in the formula, FmFuel, expressed as system consumption, unit: cubic meter.
Converting the purchase electricity into corresponding fuel consumption:
in the formula, EmRepresenting the conversion of the purchase electricity into the corresponding fuel consumption, unit: cubic meter.
Step 20) establishing a model of operation with electric fixed heat (FEL), first determining that the power load required by the system is satisfied by the gas turbine:
PMT＝PEL (6)
in the formula, PMTRepresenting the turbine output, in units: kW; pELIs the power load unit required by the whole system: kW. In the electric constant heat mode of operation, the electricity generated by the gas turbine is equal to the electrical load required by the building.
The fuel F consumed by the gas turbine is then determinedMTComprises the following steps:
in the formula etaMTIs the efficiency of the gas turbine, FMTFuel, expressed as gas turbine consumed, unit: cubic meter.
Then determining the heat quantity Q recovered by the heat recovery systemrhsComprises the following steps:
Qrhs＝(FMT-PMT)ηrhs＝FMT(1-ηMT)ηrhs (8)
in the formula etarhsIs the efficiency of the heat recovery system, QrhsRepresents the amount of heat recovered by the heat recovery system, in units: kW.
The heat Q required for the adsorption refrigerator is then determinedracComprises the following steps:
in the formula, QracRepresents the heat required by the adsorption refrigerator, unit: kW; qCLIs the cooling load of the system, in units: kW; COPacIs the coefficient of performance of an absorption chiller.
The heat Q required by the heat exchanger is then determinedrhComprises the following steps:
in the formula, QrhRepresents the heat required by the heat exchanger, in units: kW; qHLIs the heat load, unit: kW; etaheIs the efficiency of the heat exchanger.
The integrated energy system needs to meet the cold and heat demands of the user side while supplying power. If the heat recovered by the heat recovery system is not sufficient, the system will often meet the remaining portion of the heat demand by an augmented gas boiler.
The equivalent thermal load is then determined:
Qreq＝Qrac+Qrh (11)
wherein Q isreqIs the equivalent thermal load, in units: kW.
There are two possibilities:
if Qrhs≥Qreq then Qboiler＝0 (12)
if Qrhs＜Qreq then Qboiler＝Qrac+Qrh-Qrhs (13)
determining the fuel consumed by the gas boiler as follows:
the fuel consumed by the entire system is then determined to be:
Fm＝FMT+Fboiler (15)
and finally, determining that the electricity purchasing quantity from the system to the large power grid is as follows:
Pgrid＝0 (16)
in the formula, PgridThe method is characterized in that the power purchasing amount of the system to a large power grid is expressed in a unit: kW.
Step 30) establishing a heat-to-power (FTL) operation model, and firstly determining the heat quantity Q recovered by the heat recovery systemrhsComprises the following steps:
Qrhs＝Qreq＝Qrac+Qrh (17)
since the waste heat recovered by the system is known, the fuel F consumed by the gas turbineMTComprises the following steps:
in the operation mode of the fixed-power by heat, the heat required by the system is satisfied by the waste heat recovered from the gas turbine in each operation period.
Determining the output P of a gas turbineMTComprises the following steps:
PMT＝FMTηMT (19)
under this operating strategy, the electricity generated by the gas turbine is unlikely to meet the system requirements, and the shortfall is partially met by buying electricity from the large grid. There are two cases:
if PMT＜PEL then Pgrid＝PEL-PMT (20)
if PMT≥PEL then Pexcess＝PMT-PEL (21)
in the formula, PexcessIs the excess electricity produced by the gas turbine, in units: kW; can be sold to the grid or stored for future useThe preparation is used.
Finally, determining the consumption of the system fuel as follows:
Fm＝FMT (22)
step 40) from the analysis of step 20), step 30) it can be seen that when the power demand of the system and the heat demand of the system are different, the system may need to purchase electricity or supplement the heat demand by adding a gas boiler, so when electricity needs to be purchased or the boiler needs to be supplemented is a critical issue.
Rated heat-electricity ratio of gas turbine as heat supply Q of unitrhsGenerating capacity P of the unitMTThe ratio is calculated as follows:
in the formula, epsilonNIndicating the rated heat to power ratio of the gas turbine.
Determining the load demand thermoelectric ratio:
KL＝Qreq/PEL (24)
in the formula, KLRepresenting the load demand thermoelectric ratio.
For the operational mode of the FTL, the electricity purchase situation is: pEL-PMT>0 (i.e. P)EL-Qreq·ηMT/(1-ηMT)ηrhs>0) After finishing, Q is obtainedreq/PEL<εN。
For the FEL mode of operation, the case where the boiler requires afterburning is: qreq-Qhrs>0 (i.e. Q)req-PEL·(1-ηMT)·ηrhs/ηMT>0) After finishing, Q is obtainedreq/PEL>εN。
Step 50) first establishing a Primary Energy Consumption (PEC) evaluation index:
PEC＝kfFm+kePgrid (25)
in the formula, PEC represents a primary energy consumption index, kfRepresenting the primary energy consumption of natural gas in the systemCoefficient, keAnd representing the primary energy consumption coefficient of the power grid.
Build operating COST (COST):
COST＝CfFm+CePgrid (26)
wherein COST represents a system running COST index, CfRepresenting the system operating coefficient, CeRepresenting the grid operating cost factor.
Establishing CO2 emission (CDE) indexes:
CDE＝μfFm+μePgrid (27)
in the formula, CDE represents a system CO2An emission index; mu.sfRepresents the integrated system CO2 emission coefficient, μeRepresenting the grid CO2 emission factor.
Establishing a comprehensive evaluation Index (IPC), synthesizing three indexes of a formula (25), a formula (26) and a formula (27), and determining the comprehensive evaluation Index (IPC):
in the formula, ω1、ω2、ω3Representing the weight coefficients. Omega1+ω2+ω3＝1，ω1∈(0,1)，ω2∈(0,1)，ω3E (0, 1); IPC represents a comprehensive evaluation index.
(1)KL>εNIn this case, in the FTL case, power is not required to be purchased from the grid, but in the FEL case, a gas boiler needs to be additionally generated.
From KL>εNWhen, KL/εN>1 is always true, if the FEL mode of operation is better than the FTL, i.e. Δ E>0, need ηboiler>ηrAnd the heating efficiency of the boiler is generally higher than that of the integrated energy system power plant in the actual operation, so that the operation mode of the FEL is in this caseFormula (I) is superior to FTL.
(2)KL<εNAt this time, power is required to be purchased from the power grid in the FTL operation mode, but the power-increasing gas boiler is not required in the FEL mode.
When K isL<εNWhen, KL/εNIs always less than 1, so in this case if the FEL mode of operation is better than the FTL, i.e. Δ E>0, need (k)m-kgridηMT) I.e. when km/kgrid<ηMTIn the meantime, the FEL operation mode is better than the FTL operation mode, whereas the FTL operation mode is better than the FEL.
From the above analysis it was concluded that:
when KL>εNWhen or when KL<εNAnd k ism/kgrid<ηMTThe FEL operation mode is superior to the FTL operation mode;
when KL<εNAnd k ism/kgrid>ηMTIn time, the FTL mode of operation is superior to the FEL mode of operation.
When the evaluation index is determined in actual operation, a better operation mode of the FEL and the FTL is selected after the judgment, and the system operates in the operation mode, so that the performance of the system is optimal.
Unlike the above single evaluation index, when a plurality of indexes are combined, the combined evaluation index thereof can be written as:
derived from equation (31):
wherein,
let KF＝k11+k12+k13，KE＝k12+k22+k32If the above formula is converted to IPC ═ KF·Fm+KE·Egrid. It can be seen that similar to the form derived above, similar conclusions can then be drawn from the above analysis:
when KL>εNWhen or when KL<εNAnd K isF/KE<ηMTThe FEL operation mode is superior to the FTL operation mode;
when KL<εNAnd K isF/KE>ηMTIn time, the FTL mode of operation is superior to the FEL mode of operation.
Further, in step 40), the following are assumed:
1) the utilization rate of the waste heat generated by the comprehensive energy system is one hundred percent;
2) the efficiency of each device in actual operation is kept unchanged, and the device is operated without failure in an optimization period;
3) the power output by each device is continuous;
4) in each operation mode, the system can only purchase electricity from the power grid and cannot sell electricity.
Further, in step 20), step 30) and step 40), the equipment parameter is selected to be etaMT＝0.25，COPac＝0.7，ηrhs＝0.8，ηboiler＝0.8，COPec＝03.0，ηhe＝0.8，μe＝968，μf＝220，ke＝3.336，kf＝1.047，Cf＝0.19，Ce＝0.93。
Further, in step 50), it is default that the smaller the value of the evaluation index IPC, the better, but the larger the value of the evaluation index, the better, the opposite is concluded.
Compared with the prior art, the invention has the following advantages:
the invention provides a baseThe comprehensive energy system operation method based on the evaluation criterion is based on two modes of 'electricity by heat' and 'heat by electricity', and a better operation mode of 'electricity by heat' and 'heat by electricity' is selected after the judgment, so that the system operates in the operation mode, and the performance of the system is optimal. The 'electricity ordering by heat' is based on heat demand, the power output of the system is given, and the insufficient power part is satisfied by purchasing power from a large power grid; "electric constant heat" is the heat output given to the system based on the electricity demand, and the insufficient heat is supplied by the after-burning boiler. Firstly, establishing a distribution system model, and calculating the electricity purchasing quantity and the fuel consumption quantity of a distribution system; then establishing a comprehensive energy system model with two modes of 'fixing power with heat' and 'fixing heat with electricity', and respectively calculating the electricity purchasing amount and the fuel consumption amount of the comprehensive energy system; three evaluation indexes of the system are established: primary energy consumption, operating costs, CO2The discharge capacity is reduced, the comprehensive evaluation index is established by integrating the three indexes, and the utilization rate of system energy is optimized by calculating the application conditions of two main operation modes of the cooling, heating and power system, so that the system is more economical and energy-saving than the operation modes of electricity for heat determination and electricity for heat determination. The problem that due to the randomness of the load and the partial load characteristics of the unit, the load and the unit are often inconsistent, and when a certain operation mode is adopted, resource waste is often caused is well solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a working principle diagram of the comprehensive energy system containing combined cooling, heating and power supply of the invention.
Fig. 2 is a schematic diagram of the operation of the dispensing system of the present invention.
FIG. 3 is a thermoelectric ratio curve of the gas turbine of the present invention.
FIG. 4 is a flow chart of the evaluation criteria based operation strategy of the present invention
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail 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.
The invention relates to an evaluation criterion-based operation method of a comprehensive energy system, belonging to the field of comprehensive energy systems. The working principle is that after fuel is combusted in a combustion chamber, gas passes through a gas turbine to drive the gas turbine to work, high-temperature flue gas after acting is recovered by a heat recovery system, enters an adsorption refrigerator for refrigeration in summer and enters a heat exchanger for heat supply in winter, insufficient heat (the cold and hot load is converted into the heat demand) is supplemented by a gas boiler, and insufficient power load is met by purchasing electricity from a large power grid. The working principle diagram is shown in figure 1. For a conventional split-supply system, the cold load demand is satisfied by an electric chiller, the heat generated by a gas boiler is passed through a heat exchanger to satisfy the system heat demand, and the system's electrical load and the electrical power required by the electric chiller are purchased from a large power grid, the schematic of which is shown in fig. 2.
The graph of the heat-to-power ratio of a gas turbine is shown in fig. 3, ideally with the heat-to-power demand of the system just on the line, where the energy of the system is fully utilized, but it is clear that this is not practical for the system to be at a slope k ═ epsilonNAt the above point, if the system adopts the FTL operation mode, the system will generate redundant electric power; if the FEL operation mode is adopted, the heat recovered by the system cannot meet the heat requirement and needs to be met by an additional gas boiler, such as a point A in the figure. And for a position on the slope k ═ epsilonNIf the system adopts the FTL operation method, the power generated by the system cannot meet the needs of the user side, and therefore, the power needs to be purchased from the large power grid, whereas if the FEL is adopted, the system generates excessive heat, as shown in point B in the figure.
As shown in fig. 4, the method for operating a combined cooling heating and power micro grid based on model predictive control according to the present invention includes the following steps:
step 10) establishing a model of a sub-supply System (SP), firstly determining the power consumption of the electric refrigerator as follows:
in the formula, COPecRepresenting the coefficient of performance, P, of the electric refrigeratorecRepresents the input power of the electric refrigerator, unit: kW; qCLRepresents the system cooling load, unit: kW.
The fuel consumed by the boiler is then determined as:
in the formula, FboilerNatural gas, which represents the consumption of a gas boiler, unit: cubic meter; qrhRepresents heat exchanger input heat, in units: kW; η SP builder represents the efficiency of the gas boiler.
Then, determining that the power purchased by the power grid is as follows:
Pgrid＝PEL+Pec (3)
in the formula, PgridRepresenting the amount of electricity purchased from the grid, in units: kW; pELIs the electrical load of the system, unit: kW.
The fuel consumed by the system is then determined, only the gas boiler consuming:
Fm＝Fboiler (4)
in the formula, FmFuel, expressed as system consumption, unit: cubic meter.
Converting the purchase electricity into corresponding fuel consumption:
in the formula, EmIndicating conversion of electricity into pairsFuel consumption, unit: cubic meter.
Step 20) establishing a model of operation with electric fixed heat (FEL), first determining that the power load required by the system is satisfied by the gas turbine:
PMT＝PEL (6)
in the formula, PMTRepresenting the turbine output, in units: kW; pELIs the power load unit required by the whole system: kW. In the electric constant heat mode of operation, the electricity generated by the gas turbine is equal to the electrical load required by the building.
The fuel F consumed by the gas turbine is then determinedMTComprises the following steps:
in the formula etaMTIs the efficiency of the gas turbine, FMTFuel, expressed as gas turbine consumed, unit: cubic meter.
Then determining the heat quantity Q recovered by the heat recovery systemrhsComprises the following steps:
Qrhs＝(FMT-PMT)ηrhs＝FMT(1-ηMT)ηrhs (8)
in the formula etarhsIs the efficiency of the heat recovery system, QrhsRepresents the amount of heat recovered by the heat recovery system, in units: kW.
The heat Q required for the adsorption refrigerator is then determinedracComprises the following steps:
in the formula, QracRepresents the heat required by the adsorption refrigerator, unit: kW; qCLIs the cooling load of the system, in units: kW; COPacIs the coefficient of performance of an absorption chiller.
The heat Q required by the heat exchanger is then determinedrhComprises the following steps:
in the formula, QrhRepresents the heat required by the heat exchanger, in units: kW; qHLIs the heat load, unit: kW; etaheIs the efficiency of the heat exchanger.
The integrated energy system needs to meet the cold and heat demands of the user side while supplying power. If the heat recovered by the heat recovery system is not sufficient, the system will often meet the remaining portion of the heat demand by an augmented gas boiler.
The equivalent thermal load is then determined:
Qreq＝Qrac+Qrh (11)
wherein Q isreqIs the equivalent thermal load, in units: kW.
There are two possibilities:
if Qrhs≥Qreq then Qboiler＝0 (12)
if Qrhs＜Qreq then Qboiler＝Qrac+Qrh-Qrhs(13)
determining the fuel consumed by the gas boiler as follows:
the fuel consumed by the entire system is then determined to be:
Fm＝FMT+Fboiler (15)
and finally, determining that the electricity purchasing quantity from the system to the large power grid is as follows:
Pgrid＝0 (16)
in the formula, PgridThe method is characterized in that the power purchasing amount of the system to a large power grid is expressed in a unit: kW.
Step 30) establishing a heat-to-power (FTL) operation model, and firstly determining the heat quantity Q recovered by the heat recovery systemrhsComprises the following steps:
Qrhs＝Qreq＝Qrac+Qrh (17)
since the waste heat recovered by the system is known, the fuel F consumed by the gas turbineMTComprises the following steps:
in the operation mode of the fixed-power by heat, the heat required by the system is satisfied by the waste heat recovered from the gas turbine in each operation period.
Determining the output P of a gas turbineMTComprises the following steps:
PMT＝FMTηMT (19)
under this operating strategy, the electricity generated by the gas turbine is unlikely to meet the system requirements, and the shortfall is partially met by buying electricity from the large grid. There are two cases:
if PMT＜PEL then Pgrid＝PEL-PMT (20)
if PMT≥PEL then Pexcess＝PMT-PEL (21)
in the formula, PexcessIs the excess electricity produced by the gas turbine, in units: kW; may be sold to the grid or stored for future use.
Finally, determining the consumption of the system fuel as follows:
Fm＝FMT (22)
step 40) from the analysis of step 20), step 30) it can be seen that when the power demand of the system and the heat demand of the system are different, the system may need to purchase electricity or supplement the heat demand by adding a gas boiler, so when electricity needs to be purchased or the boiler needs to be supplemented is a critical issue.
Rated heat-electricity ratio of gas turbine as heat supply Q of unitrhsGenerating capacity P of the unitMTThe ratio is calculated as follows:
in the formula, epsilonNIndicating the rated heat to power ratio of the gas turbine.
Determining the load demand thermoelectric ratio:
KL＝Qreq/PEL (24)
in the formula, KLRepresenting the load demand thermoelectric ratio.
For the operational mode of the FTL, the electricity purchase situation is: pEL-PMT>0 (i.e. P)EL-Qreq·ηMT/(1-ηMT)ηrhs>0) After finishing, Q is obtainedreq/PEL<εN。
For the FEL mode of operation, the case where the boiler requires afterburning is: qreq-Qhrs>0 (i.e. Q)req-PEL·(1-ηMT)·ηrhs/ηMT>0) After finishing, Q is obtainedreq/PEL>εN。
Step 50) first establishing a Primary Energy Consumption (PEC) evaluation index:
PEC＝kfFm+kePgrid (25)
in the formula, PEC represents a primary energy consumption index, kfRepresents the primary energy consumption coefficient, k, of the natural gas of the systemeAnd representing the primary energy consumption coefficient of the power grid.
Build operating COST (COST):
COST＝CfFm+CePgrid (26)
wherein COST represents a system running COST index, CfRepresenting the system operating coefficient, CeRepresenting the grid operating cost factor.
Establishing CO2 emission (CDE) indexes:
CDE＝μfFm+μePgrid (27)
in the formula, CDE represents a system CO2An emission index; mu.sfRepresents the integrated system CO2 emission coefficient, μeRepresenting the grid CO2 emission factor.
Establishing a comprehensive evaluation Index (IPC), synthesizing three indexes of a formula (25), a formula (26) and a formula (27), and determining the comprehensive evaluation Index (IPC):
in the formula, ω1、ω2、ω3Representing the weight coefficients. Omega1+ω2+ω3＝1，ω1∈(0,1)，ω2∈(0,1)，ω3E (0, 1); IPC represents a comprehensive evaluation index.
(1)KL>εNIn this case, in the FTL case, power is not required to be purchased from the grid, but in the FEL case, a gas boiler needs to be additionally generated.
From KL>εNWhen, KL/εN>1 is always true, if the FEL mode of operation is better than the FTL, i.e. Δ E>0, need ηboiler>ηrAnd the heating efficiency of the boiler is generally higher than that of the integrated energy system power generation equipment in actual operation, so the operation mode of the FEL is better than that of the FTL in the condition.
(2)KL<εNAt this time, power is required to be purchased from the power grid in the FTL operation mode, but the power-increasing gas boiler is not required in the FEL mode.
When K isL<εNWhen, KL/εNIs always less than 1, so in this case if the FEL mode of operation is better than the FTL, i.e. Δ E>0, need (k)m-kgridηMT) I.e. when km/kgrid<ηMTIn the meantime, the FEL operation mode is better than the FTL operation mode, whereas the FTL operation mode is better than the FEL.
From the above analysis it was concluded that:
when KL>εNWhen or when KL<εNAnd k ism/kgrid<ηMTThe FEL operation mode is superior to the FTL operation mode;
when KL<εNAnd k ism/kgrid>ηMTIn time, the FTL mode of operation is superior to the FEL mode of operation.
When the evaluation index is determined in actual operation, a better operation mode of the FEL and the FTL is selected after the judgment, and the system operates in the operation mode, so that the performance of the system is optimal.
Unlike the above single evaluation index, when a plurality of indexes are combined, the combined evaluation index thereof can be written as:
derived from equation (31):
wherein,
let KF＝k11+k12+k13，KE＝k12+k22+k32If the above formula is converted to IPC ═ KF·Fm+KE·Egrid. It can be seen that similar to the form derived above, similar conclusions can then be drawn from the above analysis:
when KL>εNWhen or when KL<εNAnd K isF/KE<ηMTThe FEL operation mode is superior to the FTL operation mode;
when KL<εNAnd K isF/KE>ηMTIn time, the FTL mode of operation is superior to the FEL mode of operation.
To sum up, the method firstly establishes a distribution system model and calculates the electricity purchasing quantity and the fuel consumption quantity of the distribution system; then establishing a comprehensive energy system model with two modes of 'fixing power with heat' and 'fixing heat with electricity', and respectively calculating the electricity purchasing amount and the fuel consumption amount of the comprehensive energy system; three evaluation indexes of the system are established: primary energy consumption, operating costs, CO2The method comprises the steps of reducing the discharge capacity, integrating three indexes to establish a comprehensive evaluation index, and determining the operation mode of a comprehensive energy system by calculating the application conditions of two main operation modes of a cooling, heating and power system, so that the utilization rate of system energy is optimal, and the method is more economical and energy-saving than the operation modes of electricity for heat determination and electricity for heat determination. The problem of resource waste caused by the fact that a certain operation mode is adopted due to the fact that the randomness of the load is inconsistent with the partial load characteristics of the unit is well solved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An integrated energy system operation method based on evaluation criteria is characterized in that: firstly, establishing a distribution system model, and calculating the electricity purchasing quantity and the fuel consumption quantity of a distribution system;
then establishing a comprehensive energy system model with two modes of 'fixing power with heat' and 'fixing heat with electricity', and respectively calculating the electricity purchasing amount and the fuel consumption amount of the comprehensive energy system;
three evaluation indexes of the system are established: primary energy consumption, operating costs, CO2The method comprises the steps of reducing the discharge capacity, integrating three indexes to establish a comprehensive evaluation index, and determining the operation mode of the comprehensive energy system by calculating the application conditions of two main operation modes of the cooling, heating and power system so as to optimize the utilization rate of system energy.
2. The method of claim 1, wherein the method comprises: establishing a sub-supply system model, firstly determining the power consumption of the electric refrigerator as follows:
in the formula, COPecRepresenting the coefficient of performance, P, of the electric refrigeratorecRepresents the input power of the electric refrigerator, unit: kW; qCLRepresents the system cooling load, unit: kW;
the fuel consumed by the boiler is then determined as:
in the formula, FboilerNatural gas, which represents the consumption of a gas boiler, unit: cubic meter; qrhRepresents heat exchanger input heat, in units: kW; η SP builder represents the efficiency of the gas boiler;
then, determining that the power purchased by the power grid is as follows:
Pgrid＝PEL+Pec (3)
in the formula, PgridRepresenting the amount of electricity purchased from the grid, in units: kW; pELIs the electrical load of the system, unit: kW.
The fuel consumed by the system is then determined, only the gas boiler consuming:
Fm＝Fboiler (4)
in the formula, FmFuel, expressed as system consumption, unit: cubic meter;
converting the purchase electricity into corresponding fuel consumption:
in the formula, EmRepresenting the conversion of the purchase electricity into the corresponding fuel consumption, unit: cubic meter.
3. The method of claim 1, wherein the method comprises: establishing an electric heating operation model, firstly determining that the power load required by the system is met by the gas turbine:
PMT＝PEL (6)
in the formula, PMTRepresenting the turbine output, in units: kW; pELIs the power load unit required by the whole system: kW. In the electric constant-heat operation mode, the electricity generated by the gas turbine is equal to the electric load required by the building;
the fuel F consumed by the gas turbine is then determinedMTComprises the following steps:
in the formula etaMTIs the efficiency of the gas turbine, FMTFuel, expressed as gas turbine consumed, unit: cubic meter;
then determining the heat quantity Q recovered by the heat recovery systemrhsComprises the following steps:
Qrhs＝(FMT-PMT)ηrhs＝FMT(1-ηMT)ηrhs (8)
in the formula etarhsIs the efficiency of the heat recovery system, QrhsRepresents the amount of heat recovered by the heat recovery system, in units: kW;
the heat Q required for the adsorption refrigerator is then determinedracComprises the following steps:
in the formula, QracRepresents the heat required by the adsorption refrigerator, unit: kW; qCLIs the cooling load of the system, in units: kW; COPacIs the coefficient of performance of the absorption chiller;
the heat Q required by the heat exchanger is then determinedrhComprises the following steps:
in the formula, QrhRepresents the heat required by the heat exchanger, in units: kW; qHLIs the heat load, unit: kW; etaheIs the efficiency of the heat exchanger;
the comprehensive energy system needs to meet the cold demand and the heat demand of a user side while supplying power; if the heat recovered by the heat recovery system cannot meet the requirement, the system often meets the heat requirement of the rest part by an additional gas boiler;
the equivalent thermal load is then determined:
Qreq＝Qrac+Qrh (11)
wherein Q isreqIs the equivalent thermal load, in units: kW.
4. The method of claim 3, wherein the method comprises: there are two possibilities for equivalent thermal loading:
if Qrhs≥Qreq then Qboiler＝0 (12)
if Qrhs＜Qreq then Qboiler＝Qrac+Qrh-Qrhs (13)
determining the fuel consumed by the gas boiler as follows:
the fuel consumed by the entire system is then determined to be:
Fm＝FMT+Fboiler (15)
and finally, determining that the electricity purchasing quantity from the system to the large power grid is as follows:
Pgrid＝0 (16)
in the formula, PgridThe method is characterized in that the power purchasing amount of the system to a large power grid is expressed in a unit: kW.
5. The method of claim 3, wherein the method comprises: establishing a heat-to-power operation model, and firstly determining the heat quantity Q recovered by a heat recovery systemrhsComprises the following steps:
Qrhs＝Qreq＝Qrac+Qrh (17)
since the waste heat recovered by the system is known, the fuel F consumed by the gas turbineMTComprises the following steps:
in the operation mode of electricity by heat, the heat required by the system is satisfied by the waste heat recovered from the gas turbine in each operation period;
determining the output P of a gas turbineMTComprises the following steps:
PMT＝FMTηMT (19)。
6. the method of claim 5, wherein the method comprises: under the operation strategy, the electricity generated by the gas turbine cannot necessarily meet the system requirement, and the shortage part is met by buying electricity to a large power grid;
there are two cases:
if PMT＜PEL then Pgrid＝PEL-PMT (20)
if PMT≥PEL then Pexcess＝PMT-PEL (21)
in the formula, PexcessIs the excess electricity produced by the gas turbine, in units: kW; can be sold to the grid or stored for future use;
finally, determining the consumption of the system fuel as follows:
Fm＝FMT (22)。
7. the method of claim 5, wherein the method comprises:
rated heat-electricity ratio of gas turbine as heat supply Q of unitrhsGenerating capacity P of the unitMTThe ratio is calculated as follows:
in the formula, epsilonNIndicating the rated heat to power ratio of the gas turbine.
Determining the load demand thermoelectric ratio:
KL＝Qreq/PEL (24)
in the formula, KLRepresenting the load demand thermoelectric ratio.
8. The method of claim 7, wherein the method comprises:
for the operational mode of the FTL, the electricity purchase situation is: pEL-PMT>0 (i.e. P)EL-Qreq·ηMT/(1-ηMT)ηrhs>0) After finishing, Q is obtainedreq/PEL<εN；
For the FEL mode of operation, the case where the boiler requires afterburning is: qreq-Qhrs>0 (i.e. Q)req-PEL·(1-ηMT)·ηrhs/ηMT>0) After finishing, Q is obtainedreq/PEL>εN。
9. The method of claim 1, wherein the method comprises:
firstly, establishing a primary energy consumption evaluation index:
PEC＝kfFm+kePgrid (25)
in the formula, PEC represents a primary energy consumption index, kfNatural gas of expression system 1Coefficient of sub-energy consumption, keRepresenting the primary energy consumption coefficient of the power grid;
establishing operation cost:
COST＝CfFm+CePgrid (26)
wherein COST represents a system running COST index, CfRepresenting the system operating coefficient, CeRepresenting a grid operating cost coefficient;
establishing CO2 emission indexes:
CDE＝μfFm+μePgrid (27)
in the formula, CDE represents a system CO2An emission index; mu.sfRepresents the integrated system CO2 emission coefficient, μeRepresents the grid CO2 emission coefficient;
establishing a comprehensive evaluation index, synthesizing three indexes of a formula (25), a formula (26) and a formula (27), and determining the comprehensive evaluation index IPC:
in the formula, ω1、ω2、ω3Representing the weight coefficients. Omega1+ω2+ω3＝1，ω1∈(0,1)，ω2∈(0,1)，ω3E (0, 1); IPC represents a comprehensive evaluation index.
10. The method of claim 9, wherein the method comprises: the default is that the smaller the value of the evaluation index IPC, the better, but the larger the value of the evaluation index, the better, the opposite is concluded.
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