CN109146182A - The economic load dispatching method of meter and the distributed triple-generation system of a variety of energy storage - Google Patents
The economic load dispatching method of meter and the distributed triple-generation system of a variety of energy storage Download PDFInfo
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Abstract
The invention discloses a kind of meter and the economic load dispatching methods of the distributed triple-generation system of a variety of energy storage, earth source heat pump and hot and cold, electric energy storage are introduced into the scheduling of cogeneration cooling heating system, it establishes containing photovoltaic, CCHP system, the distributed triple-generation system of earth source heat pump and a variety of energy storage devices, with the minimum objective function of totle drilling cost in dispatching cycle, it is modeled using yalmip, model is solved with cplex solver, to obtain the optimal power output of each equipment.The present invention can be realized coordinated scheduling and conversion in CCHP type microgrid between hot and cold, electric 3 kinds of energy, reduces the adverse effect of energy coupling effect, enhances the flexible modulation ability of system, have significant economic benefit.
Description
Technical field
The present invention relates to the planning of comprehensive energy interacted system and operation field, specifically, being a kind of meter and a variety of storages
The economic load dispatching method of the distributed triple-generation system of energy.
Background technique
Reduction pollutant emission level and the utilization efficiency for improving the energy have been considered as the important goal of countries in the world.With biography
The energy-provision way of system is compared, and cogeneration may be implemented to carry out cascade utilization to the energy of different qualities, by refrigeration, heating and
The integrated supply system of power generation process has good economy and energy saving.
Have more research, document 1 (Li Gang, Li Feng, Kong Liang, Song's ancestor's merit difference electricity price to the energy storage of energy resource system at present
Under micro-capacitance sensor economic load dispatching [J] China Power containing energy-storage system, 2018,51 (02): 125-132) establish under different electricity prices
Economic load dispatching model containing electric energy storage, it was demonstrated that energy storage with peak load shifting and reduces the work of operating cost under the guidance of electricity price
With；(Jiang Ziqing, Hao Ran, Ai Qian study [J] electric power certainly based on the industrial park interaction mechanism that cool and thermal power is provided multiple forms of energy to complement each other to document 2
Dynamicization equipment, 2017,37 (06): 260-267.) for factory integration energy resource system, to propose a kind of consideration ice-storage air-conditioning more
The multipotency of kind operating mode cooperates with Optimized model, is conducive to increase the flexibility that factory system is adjusted；Document 3 (Chen Lei, Xu Fei,
Wang Xiao, wait heat accumulation promoted wind electricity digestion capability embodiment and effect analysis [J] Proceedings of the CSEE, 2015,35
(17): 4283-4290 heat accumulation) is included in the electric system active power dispatch system comprising wind-powered electricity generation, is mentioned by simulation analysis heat accumulation
Rise the effect of wind electricity digestion capability.Numerous studies are done in terms of the economic load dispatching of energy resource system to energy storage above, but to energy
The energy-provision way for coupling complicated cooling heating and power generation system lacks research.
In order to reduce the adverse effect that energy coupling acts in cooling heating and power generation system, in establishing cogeneration cooling heating system
On the basis of device model, it is introduced into the energy coupling of heat pump and the cool and thermal power three in energy storage device improvement system, makes system
It adjusts more flexible.Model is solved using mixed integer programming approach, obtains the optimized operation situation and tune of each equipment
It is economical to demonstrate this model by simulation comparison for the total cost for spending the period.
Summary of the invention
The purpose of the present invention is to provide a kind of meter and the economic load dispatchings of the distributed triple-generation system of a variety of energy storage
Method.
The technical solution for realizing the aim of the invention is as follows: a kind of meter and the distributed triple-generation system of a variety of energy storage
Economic load dispatching method introduce earth source heat pump and energy storage device on the basis of establishing cogeneration cooling heating system device model and change
The energy coupling of cool and thermal power three, obtains the optimized operation situation of each equipment and the totle drilling cost expense of dispatching cycle in kind system
With, the specific steps are as follows:
Step 1, the mathematical model for establishing cogeneration cooling heating system equipment, including gas internal-combustion engine, waste heat boiler, gas-fired boiler
The mathematical model of furnace, Absorption Refrigerator, electric refrigerating machine；
Step 2, the mathematical model for establishing earth source heat pump；
Step 3, the mathematical model for establishing energy storage device, the mathematics including battery, cold energy storage device and hot energy storage device
Model；
Step 4, with the cost of investment of system, production O&M cost, purchases strategies, fuel cost constitute total expense most
The small objective function that economic load dispatching model is established for optimization aim；
Step 5, the constraint condition for establishing economic load dispatching model meet cool and thermal power power-balance constraint, the operation of controllable unit
Constraint, energy storage device constraint and interconnecting ties power constraint；
Step 6 solves economic load dispatching model, obtains the power output situation of each equipment and the totle drilling cost of whole day.
Compared with prior art, the present invention its remarkable advantage are as follows: 1) present invention introduces heat pumps and energy storage, are conducive in CCHP
Cool and thermal power three's energy decoupling, each equipment is more independently participated among load scheduling, to increase tune
The flexibility and adjusting force of degree；2) Optimized model of present invention meter and heat pump and energy storage device can reduce the variation of net load
Rate plays the role of peak load shifting, and greatly reduces the fuel consumption of unit, has saved resource, has brought more to CCHP
Significant economic benefit has reasonability and economy.
Detailed description of the invention
Fig. 1 is distributed triple-generation system structure chart.
Fig. 2 is the photovoltaic and load power curve figure of summer typical day.
Fig. 3 be do not count and heat pump and energy storage in the case of power balance Optimized Operation result figure.
Fig. 4 be do not count and heat pump and energy storage in the case of cold power-balance Optimized Operation result figure.
Fig. 5 is the power balance Optimized Operation result figure in the case of meter and heat pump and energy storage.
Fig. 6 is the cold power-balance Optimized Operation result figure in the case of meter and heat pump and energy storage.
Specific embodiment
In the following with reference to the drawings and specific embodiments, the present invention program is further illustrated.
Equipment in meter and the distributed triple-generation system of a variety of energy storage has photovoltaic power generation, CCHP system, ground source heat
Pump and energy storage device, load has electric load, refrigeration duty and three kinds of thermic load, so the energy of system is divided into electrical transmission, cold transmission
And Heat transmission, when the energy deficiency in garden to load to power, then from bulk power grid power purchase, if having after power supply, electricity is remaining,
Then can be to power grid reverse power supply, to obtain income, specific step is as follows for the economic load dispatching method of the system:
Step 1, the mathematical model for establishing CCHP equipment contain gas internal-combustion engine, waste heat boiler, gas fired-boiler, suction in CCHP
The equipment such as receipts formula refrigeration machine, electric refrigerating machine, generally using natural gas as fuel, the high temperature discharged after fuel combustion steams gas internal-combustion engine
Vapour can be generated electricity by power-equipment, in, low-temperature smoke extraction supplies thermic load by waste heat boiler or passes through Absorption Refrigerator
Cold energy is generated, if waste heat is unable to satisfy hot and cold workload demand, by electric refrigerating machine, gas fired-boiler production capacity, the above equipment is built
Vertical mathematical model.
(1) gas turbine (Micro Turbine, MT)
In formula:For gas turbine t moment generated output；ηMTFor the generating efficiency of gas turbine；λgasIt is natural
Gas calorific value takes 9.7kWh/m here3；Gas turbine is respectively indicated in the gas consumption rate of moment t.
(2) waste heat boiler (Heat recovery Boiler, HB)
In formula:The flue gas heat generated for gas turbine in t moment；Flue gas is exported in t moment for gas turbine
The thermal power of recycling；ηHBFor the heat recovery efficiency of waste heat boiler.
(3) gas fired-boiler (Gas-fired Boiler, GB)
In formula:The thermal power generated for gas fired-boiler in t moment；ηGBFor the heat efficiency coefficient of gas fired-boiler；
It is gas fired-boiler in t moment gas consumption rate.
(4) absorption refrigeration agent (Absorption Chiller, AC)
In formula:The cold power generated for Absorption Refrigerator in t moment；COPACFor the refrigeration energy of Absorption Refrigerator
Effect ratio；Part for waste heat for refrigeration.
(5) electric refrigerating machine (Electric Chiller, EC)
In formula:For electric refrigerating machine t moment refrigeration work consumption；COPECFor the refrigeration efficiency ratio of electric refrigerating machine；For
Electrical power of the electric refrigerating machine in t moment for refrigeration.
Step 2, the mathematical model for establishing earth source heat pump；
The energy coupling of cool and thermal power three is complicated in CCHP system at present, is unfavorable for the warp of energy made full use of with system
Ji operation.And earth source heat pump energy supply compensates for the shortcoming of CCHP system flexibly and convenient for control, the two is used cooperatively can
With complementation of preferably making the most of the advantage, the harmony and economy of system call are improved.The refrigerating capacity of earth source heat pump and heating capacity
Mathematical model is
In formula:Respectively earth source heat pump is in the power consumption of moment t, refrigeration and heats power；
COP,c、COP,hThe respectively refrigeration and heating efficiency of earth source heat pump.
Step 3, the mathematical model for establishing energy storage device, including battery, cold energy storage, hot energy storage；
With the fast development of the new energy such as wind-powered electricity generation photovoltaic, the development of large capacity energy storage industry is pushed.Energy storage skill
Art realizes the production and consumption decoupling in time of energy, largely solve generation of electricity by new energy randomness,
The smooth output of generation of electricity by new energy may be implemented in fluctuation problem.Electricity energy storage herein uses battery, and cold energy storage is stored using water
Cold and hot energy storage uses heat storage tank equipment, and there is these three energy storage devices similar operation characteristic to remove in charge and discharge energy process
Outside the certain transfer efficiency of satisfaction, energy storage itself can also generate certain loss, the number of energy storage device over time
Learning model is
In formula:For energy storage device t moment output and input power；It is energy storage device in t moment
Go out activity of force.
Energy storage is related with the capacity of a upper period in the capacity of t moment, and energy model is
In formula:Respectively indicate t and after the t-1 period energy storage device dump energy, ηch、ηdisTable respectively
Show the charge and discharge efficiency of energy storage device, δ is energy storage device self-discharge coefficient, and Δ t is that unit dispatches duration.
Step 4, the objective function for establishing economic load dispatching；
The total expense C of Distributed C CHP systematic economy scheduling model containing heat pump and energy storagesBy cost of investment Cinve, production
O&M cost Copma, purchases strategies Cnetp, fuel cost CfuelComposition.
Cs=Cinve+Copma+Cnetp+Cfuel
(1) cost of investment
In formula: CRF indicates that annual year equivalence cost is arrived in conversion；RiIt is invested for the unit capacity of each equipment；Ccap,iFor
The capacity of equipment；M is number of devices；R is annual inflation rates, takes 5% herein；N is the service life of equipment.
(2) O&M cost is run
In formula: Tn indicates annual hours of operation, takes 8760；kiFor expense of i-th of the equipment in specific power；
Pi tFor equipment i t moment power output.
(3) purchases strategies
In formula:For the interaction power of interconnecting ties, indicates to buy electric energy from power grid for timing, be indicated when being negative to electricity
Net sells electric energy；ρbe、ρseRespectively indicate the price of buying and selling electricity of industrial park.
(4) fuel cost
In formula: ρfFor Gas Prices；The combustion gas that gas turbine and gas fired-boiler are respectively indicated in moment t disappears
Consume rate.
Step 5, the constraint condition for establishing economic load dispatching model；
The constraint condition of economic load dispatching model is as follows:
(1) electrical power Constraints of Equilibrium:
(2) heating power balance constrains
(3) cold power-balance constraint
(4) controllable Unit commitment
(5) energy storage device constrains
Energy-storage battery is outer in addition to meeting charge and discharge constraint and carrying capacity constraint, should also keep in each period battery capacity with
Original state is the same.
(6) interconnecting ties power constraint
In formula:Respectively photovoltaic power generation is contributed；For heat load by time and refrigeration duty；PCG,min、PCG,maxRespectively
For the upper and lower limit of controllable machine set technology power output；Respectively indicated the controllable unit generation of present period and a upper period
Power；PCG,up、PCG,downRespectively indicate the creep speed and descending rate of controllable unit；Indicate energy storage device
Maximal input, peak power output；EES,min、EES,maxRespectively indicate the minimum and maximum carrying capacity of energy storage device；T is
The period of every day；Pg,min、Pg,maxIndicate industrial park to the maximum electricity sales amount of power grid and purchase of electricity.
Step 6 realizes modeling with YALMIP, is solved with CPLEX solver, obtains the power output situation and whole day of each equipment
Totle drilling cost.
Embodiment
Mathematical model shown in FIG. 1 is established based on YALMIP software platform, summer typical case is chosen and is analyzed day, photovoltaic hair
Electricity, refrigeration duty and electric load curve are as shown in Fig. 2, act on energy coupling in cogeneration cooling heating system is reduced heat pump and energy storage
Adverse effect verified.
The parameter setting in micro- source is shown in Table 1 in CCHP, and the parameter of energy storage device is shown in Table 2, the investment and O&M parameter of each equipment
As shown in table 3, electricity price uses tou power price, is shown in Table 4, sale of electricity electricity price is 0.9 yuan/kWh.The generating efficiency η of micro turbineMT=
0.25；Waste heat boiler heat recovery efficiency ηHB=0.8；The heating efficiency η of gas fired-boilerGB=0.9；The efficiency of Absorption Refrigerator
Compare COPAC=0.8；The refrigeration efficiency ratio COP of electric refrigerating machineEC=3；The Energy Efficiency Ratio C of earth source heat pumpOP,c=6, COP,h=6.
The micro- source operating parameter of table 1
2 energy storage device parameter of table
3 equipment investment of table and O&M parameter
4 tou power price of table
As can be seen from figs. 3 and 4 the power output of micro turbine is determined by refrigeration duty when taking no account of heat pump and energy storage device, it is in
The part of the method for operation of " electricity determining by cold ", vacancy is supplied by electric refrigerating machine, it can be clearly seen that the power output of micro turbine is by cold
The restriction of load cannot independently participate in the adjusting of electric load, so that the cost of electricity-generating of micro turbine is higher than power grid purchases strategies
At the time of must also work, increase scheduling operating cost and purchase gas cost.
By Fig. 5 and Fig. 6 it is found that meter and heat pump and when energy storage device, heat pump and electric load are mainly got in touch with by battery, power grid
Line, photovoltaic power generation and micro turbine provide jointly, and refrigeration duty sets offer by Absorption Refrigerator, heat pump and accumulator.
In electricity price low-valley interval (00:00~7:00；23:00~24:00), electric load, micro turbine are supplied from power grid power purchase
In shutdown status, accumulators store electric energy appropriate, refrigeration duty demand is minimum at this time, and the high cooling efficiency of heat pump is preferentially adopted
With heat pump cooling supply, and a small amount of electricity through heat pump is sent to accumulator sets and store.
In electricity price usually section (7:00~10:00；15:00~18:00；21:00~23:00), the power generation of micro turbine at this time
Cost is higher than the power purchase price of power grid, so electrical load requirement leans on external electrical network power purchase to meet first, vacancy part is by combustion gas wheel
Machine provides, and refrigeration duty is provided by the waste heat of micro turbine by Absorption Refrigerator and heat pump, and offer is set by accumulator in vacancy part.
In electricity price peak period (10:00~15:00；18:00~21:00), electric load and refrigeration duty demand are all higher, this
When power grid purchase valence be higher than micro turbine cost of electricity-generating, refrigeration duty provided by the waste heat that micro turbine generates through Absorption Refrigerator, storage
The sufficient electric energy of battery release, extra electricity can be sold to power grid to be got a profit.
The cost of 2 kinds of scheduling modes under summer typical day is more as shown in table 5.
Cost under table 5 summer, 2 kinds of scheduling modes compares
It can be seen that in CCHP although configuration heat pump and energy storage device increase cost of investment, micro turbine and electricity refrigeration
The power output of machine substantially reduces, so that O&M cost and purchase gas cost reduce, but heat pump is obtained by the way that electric energy is cost
Biggish cooling capacity, so that power grid power purchase expense increases, but the introducing of heat pump and energy storage is brought more to CCHP on the whole
Significant economic benefit illustrates that Optimized model has reasonability and economy.
Claims (7)
1. a kind of economic load dispatching method of meter and the distributed triple-generation system of a variety of energy storage, which is characterized in that establishing
On the basis of cogeneration cooling heating system device model, it is introduced into the energy of cool and thermal power three in earth source heat pump and energy storage device improvement system
Amount coupling, obtains the optimized operation situation of each equipment and the total cost of dispatching cycle, the specific steps are as follows:
Step 1, the mathematical model for establishing cogeneration cooling heating system equipment, including gas internal-combustion engine, waste heat boiler, gas fired-boiler,
The mathematical model of Absorption Refrigerator, electric refrigerating machine；
Step 2, the mathematical model for establishing earth source heat pump；
Step 3, the mathematical model for establishing energy storage device, the mathematical model including battery, cold energy storage device and hot energy storage device；
Step 4, with the cost of investment of system, production O&M cost, purchases strategies, fuel cost constitute total expense it is minimum
Optimization aim establishes the objective function of economic load dispatching model；
Step 5, the constraint condition for establishing economic load dispatching model, meet cool and thermal power power-balance constraint, controllable unit operation constraint,
Energy storage device constraint and interconnecting ties power constraint；
Step 6 solves economic load dispatching model, obtains the power output situation of each equipment and the totle drilling cost of whole day.
2. the economic load dispatching method of meter according to claim 1 and the distributed triple-generation system of a variety of energy storage,
It is characterized in that, the mathematical model for the cogeneration cooling heating system equipment that step 1 is established specifically:
(1) gas turbine model
In formula:Generated output for gas turbine in t moment, ηMTFor the generating efficiency of gas turbine, λgasFor natural gas heat
Value,Gas turbine is respectively indicated in the gas consumption rate of moment t；
(2) waste heat boiler model
In formula:For the flue gas heat that gas turbine is generated in t moment,Flue gas is exported for gas turbine to recycle in t moment
Thermal power, ηHBFor the heat recovery efficiency of waste heat boiler；
(3) gas fired-boiler model
In formula:For the thermal power that gas fired-boiler is generated in t moment, ηGBFor the heat efficiency coefficient of gas fired-boiler,For combustion
Gas boiler is in t moment gas consumption rate；
(4) absorption refrigeration agent model
In formula:For the cold power that Absorption Refrigerator is generated in t moment, COPACFor the refrigeration efficiency ratio of Absorption Refrigerator,Part for waste heat for refrigeration；
(5) electric refrigerating machine model
In formula:Refrigeration work consumption for electric refrigerating machine in t moment, COPECFor the refrigeration efficiency ratio of electric refrigerating machine,For electricity system
Electrical power of the cold in t moment for refrigeration.
3. the economic load dispatching method of meter according to claim 1 and the distributed triple-generation system of a variety of energy storage,
It is characterized in that, the mathematical model for the earth source heat pump that step 2 is established specifically:
In formula:Respectively earth source heat pump is in the power consumption of moment t, refrigeration and heats power, COP,c、
COP,hThe respectively refrigeration and heating efficiency of earth source heat pump.
4. the economic load dispatching method of meter according to claim 1 and the distributed triple-generation system of a variety of energy storage,
It is characterized in that, electric energy storage uses battery in step 3, and cold energy storage uses heat storage tank equipment using water cold storage and hot energy storage, this three
Kind energy storage device has similar operation characteristic, and in charge and discharge energy process, other than meeting certain transfer efficiency, energy storage is certainly
Body can also generate certain loss over time, and the mathematical model of energy storage device is
In formula:For energy storage device t moment output and input power,For energy storage device going out in t moment
Activity of force.
Energy storage is related with the capacity of a upper period in the capacity of t moment, and energy model is
In formula:Respectively indicate t and after the t-1 period energy storage device dump energy；ηch、ηdisRespectively indicate storage
The charge and discharge efficiency of energy device；δ is energy storage device self-discharge coefficient；Δ t is that unit dispatches duration.
5. the economic load dispatching method of meter according to claim 1 and the distributed triple-generation system of a variety of energy storage,
It is characterized in that, the total expense C of the Distributed C CHP systematic economy scheduling model containing heat pump and energy storage in step 4sBy cost of investment
Cinve, production O&M cost Copma, purchases strategies Cnetp, fuel cost CfuelComposition:
Cs=Cinve+Copma+Cnetp+Cfuel
(1) cost of investment
In formula: CRF indicates that annual year equivalence cost, R are arrived in conversioniIt is invested for the unit capacity of each equipment, Ccap,iFor equipment
Capacity, m is number of devices, and r is annual inflation rates, and n is the service life of equipment；
(2) O&M cost is run
In formula: Tn indicates annual hours of operation, kiFor expense of i-th of the equipment in specific power, Pi tExist for equipment i
The power output of t moment；
(3) purchases strategies
In formula:For the interaction power of interconnecting ties, indicates to buy electric energy from power grid for timing, indicate to go out to power grid when being negative
Sale of electricity energy, ρbe、ρseRespectively indicate the price of buying and selling electricity of industrial park；
(4) fuel cost
In formula: ρfFor Gas Prices,Gas turbine and gas fired-boiler are respectively indicated in the gas consumption speed of moment t
Rate.
6. the economic load dispatching method of meter according to claim 1 and the distributed triple-generation system of a variety of energy storage,
It is characterized in that, the constraint condition of the economic load dispatching model of step 5 is as follows:
(1) electrical power Constraints of Equilibrium:
(2) heating power balance constrains
(3) cold power-balance constraint
(4) controllable Unit commitment
(5) energy storage device constrains
Energy-storage battery is outer in addition to meeting charge and discharge constraint and carrying capacity constraint, should also keep in each period battery capacity and initially
State is the same.
(6) interconnecting ties power constraint
In formula:Respectively photovoltaic power generation is contributed,For heat load by time and refrigeration duty, PCG,min、PCG,maxRespectively may be used
The upper and lower limit of machine set technology power output is controlled,The controllable unit generation power of present period and a upper period were respectively indicated,
PCG,up、PCG,downThe creep speed and descending rate of controllable unit are respectively indicated,Indicate the maximum of energy storage device
Input power, peak power output, EES,min、EES,maxThe minimum and maximum carrying capacity of energy storage device is respectively indicated, T is every day
Period, Pg,min、Pg,maxIndicate industrial park to the maximum electricity sales amount of power grid and purchase of electricity.
7. the economic load dispatching method of meter according to claim 1 and the distributed triple-generation system of a variety of energy storage,
It is characterized in that, step 6 is realized with YALMIP and modeled, and is solved with CPLEX solver, is obtained the power output situation and whole day of each equipment
Totle drilling cost.
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