CN107701329B - Daily operation method of electric energy storage device of combined cooling heating and power system containing renewable energy - Google Patents
Daily operation method of electric energy storage device of combined cooling heating and power system containing renewable energy Download PDFInfo
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- CN107701329B CN107701329B CN201710812880.6A CN201710812880A CN107701329B CN 107701329 B CN107701329 B CN 107701329B CN 201710812880 A CN201710812880 A CN 201710812880A CN 107701329 B CN107701329 B CN 107701329B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 76
- 238000001816 cooling Methods 0.000 title claims abstract description 17
- 238000010438 heat treatment Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000007599 discharging Methods 0.000 claims abstract description 13
- 238000010248 power generation Methods 0.000 claims description 53
- 238000011084 recovery Methods 0.000 claims description 18
- 239000002918 waste heat Substances 0.000 claims description 18
- 238000010521 absorption reaction Methods 0.000 claims description 14
- 238000004364 calculation method Methods 0.000 claims description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 238000005057 refrigeration Methods 0.000 claims description 4
- RZGZMLICFFEUIQ-UHFFFAOYSA-N 5-[(1-phenylcyclohexyl)amino]pentanoic acid Chemical compound C=1C=CC=CC=1C1(NCCCCC(=O)O)CCCCC1 RZGZMLICFFEUIQ-UHFFFAOYSA-N 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000003345 natural gas Substances 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 238000012946 outsourcing Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 238000011017 operating method Methods 0.000 claims 4
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000005338 heat storage Methods 0.000 abstract 1
- 238000013486 operation strategy Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G5/00—Profiting from waste heat of combustion engines, not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B27/00—Machines, plants or systems, using particular sources of energy
- F25B27/02—Machines, plants or systems, using particular sources of energy using waste heat, e.g. from internal-combustion engines
-
- 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
- H02J15/00—Systems for storing electric energy
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
- Y02B30/625—Absorption based systems combined with heat or power generation [CHP], e.g. trigeneration
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention discloses a daily operation method of a heat storage device of a combined cooling heating and power system containing renewable energy, which can obtain charging/discharging state decisions in each time period which are beneficial to improving the energy utilization efficiency by obtaining the maximum charging/discharging electric quantity of the hourly economy, and obtain the charging/discharging electric quantity of an electric energy storage device in each time period based on the maximum charging/discharging electric quantity of the hourly economy and by taking the full utilization of the energy storage capacity to improve the energy utilization efficiency as a principle, thereby improving the capacity of absorbing the renewable energy and improving the energy utilization efficiency.
Description
Technical Field
The invention belongs to the field of comprehensive utilization of energy, and particularly relates to an operation control technology of a combined cooling, heating and power system.
Background
The rational utilization of an electric Energy storage device is an important means for consuming renewable Energy, and an electric Energy storage device in a Distributed Energy System (Distributed Energy System) is also an important tool for coordinating renewable Energy and Combined Cooling, heating and power (CCHP) systems. As shown in fig. 1, a conventional combined cooling, heating and power system includes a generator set, a power generation waste heat recovery device, an absorption refrigerator, an electric refrigerator, etc.; meanwhile, the cold and hot electric system also comprises an auxiliary boiler. Wherein the refrigeration load is supplied by an absorption refrigerator or an electric refrigerator. The insufficient power demand is completed by the power grid purchasing, and the insufficient heat energy is supplied by the auxiliary boiler.
The tradition of the combined cooling, heating and power shown in fig. 1 also includes a renewable energy power generation device, and the renewable energy power generation can be wind power generation or photovoltaic power generation. In order to promote the consumption of renewable energy, the combined cooling heating and power system comprises an electric energy storage device. How to operate the electric energy storage device to improve the energy utilization efficiency and promote the consumption of renewable energy is a key problem of a combined cooling heating and power system.
Disclosure of Invention
The invention aims to improve the energy utilization efficiency and the renewable energy consumption capacity while meeting the cooling, heating and power loads of a system by reasonably scheduling the operation of electric energy storage equipment in a combined cooling, heating and power system.
In order to achieve the purpose, the invention adopts the following technical scheme:
a daily operation method of an electric energy storage device of a combined cooling heating and power system containing renewable energy sources is disclosed, wherein an applied CCHP system at least comprises a generator set, a renewable energy source power generation device, an electric refrigeration unit powered by the generator set and the renewable energy source power generation device, a heat recovery device for recovering the power generation waste heat of the generator set, an absorption refrigerator connected with the heat recovery device, and the electric energy storage device powered by the generator set; the renewable energy power generation comprises wind power generation and photovoltaic power generation;
the relation between power generation and power generation waste heat recovery in the CCHP system is as follows;
wherein: pCHP(t) is the electrical energy produced by the CCHP system in kWh; qCHP(t) heat energy produced by the CCHP system in kWh; fCHP(t) Natural gas consumption in kWh for the CCHP System ηCHP,HFor the heat recovery efficiency of the CCHP system ηCHP,EGenerating efficiency of the CCHP system; pCHP,MAX，PCHP,MINThe maximum and minimum generated energy of the CHP system are respectively expressed in kWh; a, b and c are coefficients of CCHP power generation efficiency; f is the output ratio of the PGU of the generator set;
the cold and heat load balance in the CCHP system is as follows:
wherein: l isC(t) the cold load demand of the CCHP system in kWh; l isH(t) heat load demand in kWh for the CCHP system; l isE(t) electrical load demand in kWh for the CCHP system; pWT(t) is the electric energy produced by wind power generation in the CCHP system, and the unit is kWh; pPV(t) is the electrical energy produced by photovoltaic power generation of the CCHP system, in kWh; pGRID(t) purchasing the electric quantity of the power grid for the CCHP system, wherein the unit is kWh; qEC(t) is the refrigerating output of the CCHP system electric refrigerating machine, and the unit is kWh；COPECIs the efficiency coefficient of the electric refrigerator; qABC(t) the refrigerating capacity produced by the absorption refrigerator of the CCHP system is expressed in kWh; COPABCIs the efficiency coefficient of the absorption refrigerator; qBL(t) the CCHP system assists the boiler to produce heat energy, and the unit is kWh; pCE(t); charging the CCHP system electric energy storage device with electric quantity in kWh; pDCE(t) the discharge capacity of the thermoelectric energy storage device of the CCHP system is represented by kWh, β is an integer variable, 1 represents a charging state, and 0 represents a discharging state;
the charging/discharging process of the electrical energy storage device can promote the improvement of energy utilization efficiency, and the operation of the electrical energy storage device has the following limitations: 1) maximum capacity of stored energy ESE,MAXWhen the energy storage capacity of the electric energy storage device reaches the maximum capacity of the electric energy storage device, the electric energy storage device cannot be continuously charged with heat; 2) maximum charging capacity limit Q of energy storage device in time period tCE,MAXThe charging capacity cannot exceed the maximum charging capacity limit in the time period t; 3) maximum discharge capacity limit Q of electric energy storage device in time period tDCE,MAXThe discharge capacity cannot exceed the maximum discharge capacity limit of the electrical energy storage device in the time period t;
said LC(t)，LH(t)，LE(t)、PWT(t) and PPV(T) is a known value, where T is 1,2, …, T being the maximum number of future day periods;
maximum hourly heat charge/discharge
The calculation formula is calculated according to the following formula in three cases:
condition 1:
condition 2
Condition 3
P' (t) is obtained by
Obtaining P "(t) by
Wherein: k'CHP,QPIs generated as (L)E(t)-PWT(t)-PPV(t)+LC(t)/COPEC) Calculating the coefficient of the waste heat recovery heat according to the step (7); k ″)CHP,QPIs generated as (L)E(t)-PWT(t)-PPV(t)) a waste heat recovery heat calculation coefficient;
is generated as (L)E(t)-PWT(t)-PPV(t)+LC(t)/COPEC) The power generation efficiency of (1);
is generated as (L)E(t)-PWT(t)-PPV(t)) power generation efficiency; p' (t) is L for recovering heat from waste heat of power generationH(t)+LC(t)/COPABCGenerating capacity corresponding to the time; p' (t) is power generation waste heat recovery heatIs LH(t) the corresponding power generation amount;
when the specified charge level is
And a discharge level of
The charging capacity of the electric energy storage device is PCE(t) the discharge capacity is PDCE(t) calculating according to (11) and (12), respectively; daily charge capacity is ECEDaily discharge capacity is EDCH(ii) a Wherein the content of the first and second substances,
charging energy P in case of dayCELess than the maximum capacity E of stored energySE,MAXReducing the level of charging
Charging energy E if dayCEGreater than the maximum energy storage capacity ESE,MAXIncrease the charging level
Charging energy E if dayCEEqual to the maximum energy storage capacity ESE,MAXThe charging level
Is the current day charge level;
if it is notDaily discharge capacity EDCELess than charging electric energy ECEMultiplied by energy storage efficiency ηSEIncrease the discharge level
If daily discharge capacity EDCEGreater than charging electric energy ECEMultiplied by energy storage efficiency ηSELowering the discharge level
If daily discharge capacity EDCEEqual to charging electric energy ECEMultiplied by energy storage efficiency ηSEThe level of the discharge
Is the discharge level on the same day; the daily charge capacity and the daily discharge capacity satisfy the following formulas:
ECE·ηSE＝EDCE。
has the advantages that:
the daily operation strategy of the electric energy storage device of the combined cooling heating and power system containing renewable energy provided by the invention obtains the charging/discharging judgment for improving the utilization efficiency of CCHP energy, so that the energy storage improves the utilization efficiency of energy. The daily operation strategy utilizes the energy storage capacity of the electric energy storage device to the maximum extent, and gives the charging/discharging electric quantity in a specific time interval.
Drawings
FIG. 1 is a system schematic of a prior art intercooled combined heat and power system;
fig. 2 is a schematic flow chart of a daily operation method of the electric energy storage device of the cogeneration system of cooling, heating and power containing renewable energy according to the present invention.
Detailed Description
The present invention will be further described by way of example with reference to the accompanying fig. 2, which is illustrative and not limitative, and the scope of the invention is not to be limited thereby.
The implementation of the invention applies to the central controller of a CCHP system, the purpose of which is to set the power production P of the generatorCHP(t) electric systemRefrigerating output Q of refrigeratorEC(t) refrigerating capacity Q of absorption refrigerating machineABC(t) outsourcing power grid electricity quantity PGRID(t), auxiliary boiler production heat QBL(t) the amount of charge P of the electrical energy storage deviceCE(t) and generated Power quantity PDCE(t) of (d). The specific steps for implementing the daily operation strategy of the heat energy storage device of the combined cooling heating and power system containing renewable energy sources are as follows.
Step 1: obtaining parameters of the equipment in advance: 1) and calculating coefficients a, b and c of the efficiency of the generator set. 2) Energy efficiency coefficient COP of electric refrigeratorEC(ii) a 3) Energy efficiency coefficient COP of absorption chillerABC(ii) a 4) Maximum power generation amount P of CCHP system generator setCHP,MAXIn kWh; 5) maximum energy storage capacity E of electric energy storage deviceSE,MAXWith a unit of kWh, the maximum charging capacity Q of the electrical energy storage device over a period of time tCE,MAXIn kWh; time period t maximum discharge electric quantity Q of electric energy storage deviceDCE,MAXIn kWh.
In the time period t, the relation between the power generation and the power generation waste heat recovery in the CCHP system is as follows;
wherein: pCHP(t): the CCHP system produces electric energy in kWh; qCHP(t): the heat energy produced by the CCHP system is in kWh; fCHP(t) Natural gas consumption in kWh for the CCHP System ηCHP,HHeat recovery efficiency of CCHP system ηCHP,E: the power generation efficiency of the CCHP system; pCHP,MAX，PCHP,MINMaximum and minimum generated energy of the CHP system respectively, and the unit is kWh; a, b and c are coefficients of CCHP power generation efficiency; f is the output ratio of the PGU of the generator set;
during time period t, the cold-heat-electricity load balance in the CCHP system is:
wherein: l isC(t) the cold load demand of the CCHP system in kWh;LH(t) heat load demand in kWh for the CCHP system; l isE(t) electrical load demand in kWh for the CCHP system; pWT(t) is the electric energy produced by wind power generation in the CCHP system, and the unit is kWh; pPV(t) is the electrical energy produced by photovoltaic power generation of the CCHP system, in kWh; pGRID(t) purchasing the electric quantity of the power grid for the CCHP system, wherein the unit is kWh; qEC(t) the refrigerating capacity produced by the electric refrigerating machine of the CCHP system is expressed in kWh; COPECIs the efficiency coefficient of the electric refrigerator; qABC(t) the refrigerating capacity produced by the absorption refrigerator of the CCHP system is expressed in kWh; COPABCIs the efficiency coefficient of the absorption refrigerator; qBL(t) the CCHP system assists the boiler to produce heat energy, and the unit is kWh; pCE(t); charging the CCHP system electric energy storage device with electric quantity in kWh; pDCE(t) the discharge capacity of the thermoelectric energy storage device of the CCHP system is represented by kWh, β is an integer variable, 1 represents a charging state, and 0 represents a discharging state;
step 2: the cooling, heating and power load demand L of a known time period tC(t)，LH(t)，LE(t); wind power generation PWT(t) and photovoltaic power generation capacity PPV(T), T ═ 1,2, …, T. Wherein T is the maximum number of time periods in one day in the future, and if the time periods are divided by hours, T is taken as 24.
And step 3: calculating the maximum hourly economical charge/discharge according to equation (3)
Maximum charge/discharge per hour
The calculation formula is calculated according to formula (3) in three cases, wherein (7), (8) gives parameters required for the calculation of (4), (5), (6), and (4), (5), (6) are different conditions, and the calculation formula in (3) is selected according to the satisfaction thereof to obtain the "hourly economic maximum charge/discharge amount". P '(t), P' (t) in the formula (3) are obtained from the formulae (9) and (10), respectively.
Wherein: k'CHP,QPIs generated as (L)E(t)-PWT(t)-PPV(t)+LC(t)/COPEC) Calculating the coefficient of the waste heat recovery heat according to the step (7); k ″)CHP,QPIs generated as (L)E(t)-PWT(t)-PPV(t)) calculating the coefficient of the waste heat recovery heat quantity according to the calculation in the step (8);
is generated as (L)E(t)-PWT(t)-PPV(t)+LC(t)/COPEC) The power generation efficiency of (1);
is generated as (L)E(t)-PWT(t)-PPV(t)) power generation efficiency; p' (t) is L for recovering heat from waste heat of power generationH(t)+LC(t)/COPABCCalculating the corresponding generated energy according to the formula (9); p' (t) is L for recovering heat from power generation waste heatHThe power generation amount corresponding to (t) is calculated according to the expression (10).
And 4, step 4: setting a charge level
And 5: the charge capacity of the time period t is found according to the equation (11).
When the specified charge level is
And a discharge level of
Charging capacity P of time t electric energy storage deviceCE(t), discharge capacity PDCE(t) is calculated according to (11) and (13), respectively.
Step 6: the daily charge capacity E is obtained according to the formula (12)CE。
And 7: charging energy E if dayCELess than the maximum capacity E of electrical energy storageSE,MAXReducing the level of charging
Then, turning to step 4; charging energy E if dayCEGreater than the maximum capacity E of the electrical energy storage meansSE,MAXIncrease the charging level
Turning to the step 4; charging energy E if dayCEEqual to the maximum energy storage capacity ESE,MAXThe charging level
Turning to step 7 for the current day charging level;
and 8: setting discharge level
And step 9: the discharge capacity of the time period t is obtained according to the formula (13).
Step 10: the daily discharge capacity E is obtained according to the formula (14)DCH。
Step 11: if daily discharge capacity EDCELess than daily charging energy ECEMultiplied by energy storage efficiency ηSEIncrease the discharge level
Turning to step 8; if daily discharge capacity EDCECharging energy E greater than dailyCEMultiplied by energy storage efficiency ηSELowering the discharge level
Turning to step 8; if daily discharge capacity EDCEEqual to charging electric energy ECEMultiplied by energy storage efficiency ηSEThe level of the discharge
Turning to step 12 for the discharge level on the same day;
step 12: after the charging electric quantity and the discharging electric quantity of the electric energy storage device are determined, the communication device sends out the command to execute.
Step 13: waiting for the next time period to go to step 2.
Claims (5)
1. A daily operation method of an electric energy storage device of a combined cooling heating and power system containing renewable energy sources is disclosed, wherein an applied CCHP system at least comprises a generator set, a renewable energy source power generation device, an electric refrigeration unit powered by the generator set and the renewable energy source power generation device, a heat recovery device for recovering the power generation waste heat of the generator set, an absorption refrigerator connected with the heat recovery device, and the electric energy storage device powered by the generator set; the renewable energy power generation comprises wind power generation and photovoltaic power generation; the method comprises the following steps:
step 1: obtaining parameters of the equipment in advance: 1) calculating coefficients a, b and c of the efficiency of the generator set; 2) energy efficiency coefficient COP of electric refrigeratorEC(ii) a 3) Energy efficiency coefficient COP of absorption chillerABC(ii) a 4) Maximum power generation amount P of CCHP system generator setCHP,MAXIn kWh; 5) maximum energy storage capacity E of electric energy storage deviceSE,MAXWith a unit of kWh, the maximum charging capacity Q of the electrical energy storage device over a period of time tCE,MAXIn kWh; time period t maximum discharge electric quantity Q of electric energy storage deviceDCE,MAXIn kWh;
in the time period t, the relation between the power generation and the power generation waste heat recovery in the CCHP system is as follows:
wherein: pCHP(t) is the electrical energy produced by the CCHP system in kWh; qCHP(t) heat energy produced by the CCHP system in kWh; fCHP(t) Natural gas consumption in kWh for the CCHP System ηCHP,HFor the heat recovery efficiency of the CCHP system ηCHP,EGenerating efficiency of the CCHP system; pCHP,MAX，PCHP,MINThe maximum and minimum generated energy of the CHP system are respectively expressed in kWh; a, b and c are coefficients of CCHP power generation efficiency; f is the output ratio of the PGU of the generator set;
during time period t, the cold-heat-electricity load balance in the CCHP system is:
wherein: l isC(t) the cold load demand of the CCHP system in kWh; l isH(t) heat load demand in kWh for the CCHP system; l isE(t) electrical load demand in kWh for the CCHP system; pWT(t) is the electric energy produced by wind power generation in the CCHP system, and the unit is kWh; pPV(t) is the electrical energy produced by photovoltaic power generation of the CCHP system, in kWh; pGRID(t) purchasing the electric quantity of the power grid for the CCHP system, wherein the unit is kWh; qEC(t) the refrigerating capacity produced by the electric refrigerating machine of the CCHP system is expressed in kWh; COPECIs the efficiency coefficient of the electric refrigerator; qABC(t) the refrigerating capacity produced by the absorption refrigerator of the CCHP system is expressed in kWh; COPABCIs the efficiency coefficient of the absorption refrigerator; qBL(t) the CCHP system assists the boiler to produce heat energy, and the unit is kWh; pCE(t); charging the CCHP system electric energy storage device with electric quantity in kWh; pDCEAnd (t) is the discharge capacity of the thermoelectric energy storage device of the CCHP system, the unit is kWh, β is an integer variable, 1 represents the charging state, and 0 represents the discharging state, and the method is characterized in that:
the charging/discharging process of the electrical energy storage device can promote the improvement of energy utilization efficiency, and the operation of the electrical energy storage device has the following limitations: 1) maximum capacity of electrical energy storage ESE,MAXWhen the energy storage capacity of the electric energy storage device reaches the maximum capacity of the electric energy storage device, the electric energy storage device cannot be continuously charged with heat; 2) maximum charging capacity limit Q of energy storage device in time period tCE,MAXThe charging capacity cannot exceed the maximum charging capacity limit in the time period t; 3) maximum discharge capacity limit Q of electric energy storage device in time period tDCE,MAXThe discharge capacity cannot exceed the maximum discharge capacity limit of the electrical energy storage device in the time period t;
step 2: said LC(t)，LH(t)，LE(t)、PWT(t) and PPV(T) is a known value, where T is 1,2, …, T,t is the maximum number of future one-day periods;
and step 3: calculating maximum hourly economic charge/discharge
Maximum hourly heat charge/discharge
The calculation formula is calculated according to the following formula in three cases:
condition 1:
condition 2:
condition 3:
p' (t) is obtained by
Obtaining P "(t) by
Wherein: k'CHP,QPIs generated as (L)E(t)-PWT(t)-PPV(t)+LC(t)/COPEC) The coefficient of the waste heat recovery heat quantity is calculated according to the formula
Calculating to obtain; k ″)CHP,QPIs generated as (L)E(t)-PWT(t)-PPV(t)) a waste heat recovery heat calculation coefficient;
is generated as (L)E(t)-PWT(t)-PPV(t)+LC(t)/COPEC) The power generation efficiency of (1);
is generated as (L)E(t)-PWT(t)-PPV(t)) power generation efficiency; p' (T) is L for recovering heat from power generation waste heatH(t)+LC(t)/COPABCGenerating capacity corresponding to the time; p' (t) is L for recovering heat from power generation waste heatH(t) the corresponding power generation amount;
and 4, step 4: setting a charge level
And 5: obtaining the charging electric quantity of the time period t; when the specified charge level is
And a discharge level of
The charging capacity of the electric energy storage device is PCE(t) the discharge capacity is PDCE(t) daily charge capacity ofECEDaily discharge capacity is EDCH(ii) a Wherein the content of the first and second substances,
step 6: calculating daily charging capacity ECE；
And 7: charge capacity on day ECELess than the maximum capacity E of electrical energy storageSE,MAXReducing the level of charging
Then, turning to step 4; charge capacity on day ECEGreater than the maximum capacity E of the electrical energy storage meansSE,MAXIncrease the charging level
Turning to the step 4; charge capacity on day ECEEqual to the maximum energy storage capacity ESE,MAXThe charging level
Is the current day charge level;
and 8: setting discharge level
And step 9: obtaining the discharge electric quantity P of the time interval tDCE(t)；
Step 10: the daily discharge capacity E is obtained according to the following formulaDCH；
Step 11: if daily discharge capacity EDCELess than daily charge capacity ECEMultiplied by energy storage efficiency ηSEIncrease the discharge level
If daily discharge capacity EDCEGreater than daily charge capacity ECEMultiplied by energy storage efficiency ηSELowering the discharge level
If daily discharge capacity EDCEEqual to charging electric energy ECEMultiplied by energy storage efficiency ηSEThe level of the discharge
Is the discharge level on the same day;
step 12: the daily charge capacity and the daily discharge capacity satisfy the following formulas:
ECE·ηSE＝EDCE。
2. the daily operating method according to claim 1, characterized in that: central controller applied to CCHP system and aiming at setting power generation amount P of generatorCHP(t) refrigerating capacity Q produced by electric refrigeratorEC(t) refrigerating capacity Q produced by absorption refrigeratorABC(t) outsourcing power grid electric quantity PGRID(t) auxiliary boiler Heat of production QBL(t) amount of charge P of the electrical energy storage deviceCE(t) and generated Power quantity PDCE(t)。
3. The daily operating method according to claim 1, characterized in that: after the charging electric quantity and the discharging electric quantity of the electric energy storage device are determined, the command is sent out to be executed through the communication device.
4. The daily operating method according to claim 1, characterized in that: in step 2, if the time period is divided into small time periods, T is taken as 24.
5. The daily operating method according to any one of claims 1 to 4, characterized in that: the applied CCHP system also includes an electric refrigeration unit and an auxiliary boiler.
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