CN112736984B - Method for improving wind-abandoning and absorbing capacity of electric-thermal comprehensive energy system - Google Patents
Method for improving wind-abandoning and absorbing capacity of electric-thermal comprehensive energy system 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/003—Load forecast, e.g. methods or systems for forecasting future load demand
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/004—Generation forecast, e.g. methods or systems for forecasting future energy generation
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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
- 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
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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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
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Abstract
The invention belongs to the field of electric-thermal comprehensive energy systems, and particularly relates to a method for improving the wind-discarding and absorbing capacity of an electric-thermal comprehensive energy system. Comprising the following steps: determining an electric-thermal comprehensive energy system structure; determining mathematical models of all comprehensive energy system equipment according to the structure of the electric-thermal comprehensive energy system; determining an objective function in the electric-thermal integrated energy system and determining constraint conditions in the electric-thermal integrated energy system; determining an electrical load, a thermal load and an electrical wind forecast value; the output condition of each device in the electric-thermal comprehensive energy system is optimized and solved; and determining a dispatching plan of a dispatching department according to the output of each device. The problem of abandon wind is solved mainly through heating device, when abandon wind is many, will be unnecessary wind-powered electricity generation changes heat energy, is used for heating or stores through heat accumulation device, the decoupling thermocouple promotes the regulating ability of system.
Description
Technical Field
The invention belongs to the field of comprehensive energy systems, and particularly relates to a method for improving the wind-discarding and absorbing capacity of an electric-thermal comprehensive energy system.
Background
In recent years, wind power is connected in a large scale, and because the uncertainty of the wind power influences the stable operation of the system, in order to ensure the supply and demand balance in the operation process, the power system needs to have certain strain and response capacity, namely the flexibility of the system, so as to eliminate or reduce the negative influence caused by uncertain factors as much as possible and ensure the safe and stable operation of the power system.
At present, the flexibility of the comprehensive energy system is mainly improved by the following method: firstly, the thermoelectric coupling relation of 'heat fixed electricity' can be broken by utilizing the complementary characteristics of an energy storage technology and wind power, in particular a heat storage device, but the absorption capacity of the independent adding system to the abandoned wind is poor; secondly, by utilizing the response of the demand side and the inertia of the thermal load, the heat can be supplied according to the conditions of the electric load, the thermal load and the wind power output, the heat is supplied when the wind is large, the heat supply is reduced when the wind is small, the investment cost is low, and the effect is inferior to that of adding the heat storage device.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for improving the wind-abandoning and absorbing capacity of an electric-thermal comprehensive energy system, eliminating or reducing negative effects caused by uncertain factors and ensuring safe and stable operation of an electric power system.
The invention is realized in such a way that a method for improving the wind-abandoning and absorbing capacity of a comprehensive energy system comprises the following steps:
determining an electric-thermal comprehensive energy system structure;
determining mathematical models of all comprehensive energy system equipment according to the structure of the electric-thermal comprehensive energy system;
determining an objective function in the electric-thermal integrated energy system;
determining constraint conditions in an electric-thermal integrated energy system;
determining an electrical load, a thermal load and an electrical wind forecast value;
the output condition of each device in the electric-thermal comprehensive energy system is optimized and solved;
and determining a dispatching plan of a dispatching department according to the output of each device.
Further, the electric-thermal comprehensive energy system is a thermoelectric coupling relation of a decoupling cogeneration unit and is used for improving the wind power receiving capacity of the power grid; the heat storage device is additionally arranged on the side of the cogeneration unit so as to achieve the aim of decoupling the thermoelectric coupling characteristic, improve the optimal configuration capacity of the power system and enhance the capacity of the power grid for absorbing abandoned wind; and an electric boiler and a heat pump are arranged on the load side of the power grid and are used for realizing coordinated heat supply and achieving the purposes of heat supply and wind disposal elimination.
Further, the mathematical model of each integrated energy system device is determined according to the structure of the electric-thermal integrated energy system as follows:
(1) Constraint of wind turbine generator system:
wherein:for the actual power generation amount of the wind power at the moment t, P wind,t The predicted generating capacity of the wind power at the moment t;
(2) CHP constraint:
wherein: p (P) chp,t And Q chp,t The electric power and the thermal power representing CHP at time t;and->Representing the lower and upper limit of CHP electric power,/->And->Representing lower and upper limits of CHP thermal power;
max(C v ·Q chp,t +P chp,D ,C m ·Q chp,t +P chp,C )≤P chp,t ≤C v ·Q chp,t +P chp,A (4)
wherein: c (C) v ，P chp,D ，C m ，P chp,C And P chp,A The thermoelectric coupling parameter is the thermoelectric coupling parameter of the CHP and represents the thermoelectric coupling relation between the electric power and the thermal power of the CHP;
(3) Heat storage restraint
R s,t -R s,t-1 -Q loss,t ＝Q s,t (5)
Q loss,t ＝η s ·R s,t-1 (6)
Wherein: r is R s,t Representing the total heat stored at time t, Q loss,t Indicating heat loss at time t, Q s,t Is the heat that absorbs/releases heat at time t. η (eta) s Representing a loss factor;
wherein:and->Representing the lower and upper limit of the heat storage capacity of the heat storage, < + >>And->A lower limit and an upper limit of heat storage and absorption heat are indicated;
(4) Heat pump restraint
Q hp,t ＝COP·P hp,t (9)
Wherein:and->Representing the lower and upper limits of heat pump heat output. Q (Q) hp,t Representing the heat output of the heat pump at time t, P hp,t Representing the electrical power of the heat pump; the coefficient of performance (COP) of a heat pump defines the ratio between its heat output and electric power;
(5) Electric boiler restraint
Like a heat pump, an electric boiler generates heat by consuming electric energy, and the constraints are expressed as follows:
Q eb,t ＝η eb ·P eb,t (12)
wherein:and->Showing the lower and upper limits of the heat output of the electric boiler, and eta eb Is the relation between the electric power and the heat output of the electric boiler.
Further, the objective function in the electric-thermal integrated energy system is determined as follows:
wherein: f (F) chp 、F ex The operation cost, the wind abandoning punishment cost and the electricity purchasing cost of the CHP in the scheduling period are respectively represented;
(1) Cost of operation of CHP
Wherein: lambda (lambda) chp For the coal consumption price, T represents the total time period number, n represents the unit number of the CHP,the coal consumption of the ith CHP at time t is shown as follows:
wherein:is the coal consumption coefficient of the ith unit;
(2) Cost of punishment of wind disposal
Because wind power has the characteristics of randomness and uncontrollable, in order to increase the wind power absorption rate, the wind discarding punishment cost is added into an objective function, as shown in the formula:
wherein:punishment of costs for wind abandon->For penalty coefficient of wind abandon, m is wind turbine number, < ->The wind discarding quantity of the jth wind turbine generator set at the moment t is represented and is equal to the wind power predicted generated energy minus the actual generated energy of wind power;
(3) Cost of electricity purchase
Adding electricity purchasing cost into an objective function, transmitting electricity to an external power grid when the generated energy of wind power is large, purchasing electricity from the external power grid when the generated energy is small, and adopting the following formula:
wherein: f (F) ex Represents the electricity purchase cost lambda ex,t 、P ex,t And the electricity purchase, electricity selling price and power at the moment t are indicated.
Further, determining constraints in the electric-thermal integrated energy system:
(1) Electric power balance constraint
Wherein:representing the actual power generation amount, P, of the jth fan at the time t ex,t Representing the exchange power of an external power grid, P eb,t And P hp,t Respectively representing the power consumption of the kth electric boiler and the h heat pump at the t moment, +.>Representing electrical load demand;
(2) Thermal power balance constraint
Wherein:and->Respectively representing the heat generation quantity of the kth electric boiler and the h heat pump, +.>Represents the heat absorption and release quantity of the heat storage of the g-th table, < >>Indicating the thermal load demand.
Further, optimizing the output condition of solving equipment: the optimization model is shown as follows:
wherein: f (x) is the total running cost; g (x) =0 is the equilibrium constraint in the electric-thermal integrated energy system; h (x) is an inequality constraint in the optimization problem, and comprises the operation constraint of CHP, a heat pump, an electric boiler, heat storage and fan equipment; x represents the decision variable for each period.
The optimization problem is a nonlinear multi-element function minimum problem, and the solution of the model adopts an fmincon function in MATLAB.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the problem of wind disposal is solved mainly through the heating device, when the wind disposal is more, redundant wind power is converted into heat energy for supplying heat or the heat energy is stored through the heat storage device, the thermocouple is decoupled, and the regulating capacity of the system is improved. By means of the optimized operation model, the day-ahead dispatching plan is optimized and solved, the output condition of each device of the system can be analyzed, the cost is minimum by adjusting the output of the device, the abandoned wind is best, and the best economical efficiency can be obtained.
Drawings
FIG. 1 is a flow chart of a method provided by the present invention;
FIG. 2 is a schematic diagram of an electrical-thermal integrated energy system according to the present invention;
FIG. 3 is an electrical load curve, a thermal load curve, and a wind power prediction curve;
FIG. 4 is a view of wind power consumption without the method of the present invention;
FIG. 5 is a graph of wind power consumption after the method of the invention is utilized.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1 to 5, the method for improving the wind disposal capacity of the comprehensive energy system comprises the following steps:
1. determining an electric-thermal comprehensive energy system structure; the electric-thermal comprehensive energy system is in a thermal-electric coupling relation of a decoupling cogeneration unit, and improves the wind power receiving capacity of a power grid.
The heat storage device is arranged on the side of the cogeneration unit, so that the aim of decoupling the thermoelectric coupling characteristic can be fulfilled, the optimal configuration capacity of the power system is improved, and the capacity of the power grid for absorbing abandoned wind is enhanced. However, the wind abandoning phenomenon still occurs when only the heat storage is configured, and at the moment, if the electric boiler and the heat pump are connected to the load side for coordinated heat supply with the cogeneration unit, the wind abandoning and absorbing space of the power grid can be further expanded.
The heat storage device is used for flexibly adjusting the output of the cogeneration unit, so that the hot output of the steam turbine at different moments of the cogeneration unit reaches an ideal value, and the thermalization generating capacity of the unit is not changed. After the electric-thermal comprehensive energy system is connected with the electric boiler and the heat pump, on one hand, the electric power adjusting interval of the cogeneration unit is larger through the coordinated heat supply of the electric boiler and the heat pump and the heat storage device; on the other hand, the electric load is increased simultaneously by the connection of the electric boiler and the heat pump, and the capacity of the power grid for absorbing the abandoned wind power is greatly enhanced by the simultaneous action of the electric boiler and the heat pump.
2. Determining mathematical models of all comprehensive energy system equipment according to the structure of the electric-thermal comprehensive energy system;
(1) Constraint of wind turbine generator system:
wherein:for the actual power generation amount of the wind power at the moment t, P wind,t The predicted generating capacity of the wind power at the moment t;
(2) CHP constraint
Wherein: p (P) chp,t And Q chp,t The electric power and the thermal power representing CHP at time t;and->Representing the lower and upper limit of CHP electric power,/->And->Representing lower and upper limits of CHP thermal power;
max(C v ·Q chp,t +P chp,D ,C m ·Q chp,t +P chp,C ≤P chp,t ≤C v ·Q chp,t +P chp,A ) (4)
wherein: c (C) v ，P chp,D ，C m ，P chp,C And P chp,A The thermoelectric coupling parameter is the thermoelectric coupling parameter of the CHP and represents the thermoelectric coupling relation between the electric power and the thermal power of the CHP;
(3) Heat storage restraint
R s,t -R s,t-1 -Q loss,t ＝Q s,t (5)
Q loss,t ＝η s ·R s,t-1 (6)
Wherein: r is R s,t Representing the total heat stored at time t, Q loss,t Indicating heat loss at time t, Q s,t Is the heat that absorbs/releases heat at time t. η (eta) s Representing a loss factor;
wherein:and->Representing the lower and upper limit of the heat storage capacity of the heat storage, < + >>And->Indicating the lower and upper limits of the heat storage and absorption heat.
(4) Heat pump restraint
Q hp,t ＝COP·P hp,t (9)
Wherein:and->Representing the lower and upper limits of heat pump heat output. Q (Q) hp,t Representing the heat output of the heat pump at time t, P hp,t Representing the electrical power of the heat pump. The coefficient of performance (COP) of a heat pump defines the ratio between its heat output and electric power;
(5) Electric boiler restraint
Like a heat pump, an electric boiler generates heat by consuming electric energy, and the constraints are expressed as follows:
Q eb,t ＝η eb ·P eb,t (12)
wherein:and->Showing the lower and upper limits of the heat output of the electric boiler, and eta eb Is the relation between the electric power and the heat output of the electric boiler;
3. determining an objective function in the electric-thermal integrated energy system;
wherein: f (F) chp 、F ex The operation cost, the wind abandoning punishment cost and the electricity purchasing cost of the CHP in the scheduling period are respectively represented;
(1) CHP running cost:
wherein: lambda (lambda) chp For the coal consumption price, T represents the total time period number, n represents the unit number of the CHP,the coal consumption of the ith CHP at time t is shown as follows:
wherein:is the coal consumption coefficient of the ith unit,
(2) Wind abandoning punishment cost:
because wind power has the characteristics of randomness and uncontrollable, in order to increase the wind power absorption rate, the wind discarding punishment cost is added into an objective function, as shown in the formula:
wherein:punishment of costs for wind abandon->For penalty coefficient of wind abandon, m is wind turbine number, < ->The wind discarding quantity of the jth wind turbine generator set at the moment t is represented and is equal to the wind power predicted generated energy minus the actual generated energy of wind power;
(3) Electricity purchasing cost:
adding electricity purchasing cost into an objective function, transmitting electricity to an external power grid when the generated energy of wind power is large, purchasing electricity from the external power grid when the generated energy is small, and adopting the following formula:
wherein: f (F) ex Represents the electricity purchase cost lambda ex,t 、P ex,t And the electricity purchase, electricity selling price and power at the moment t are indicated.
4. Determining constraint conditions in an electric-thermal integrated energy system;
(1) Electric power balance constraint
Wherein:representing the actual power generation amount, P, of the jth fan at the time t ex,t Representing the exchange power of an external power grid, P eb,t And P hp,t Respectively representing the power consumption of the kth electric boiler and the h heat pump at the t moment, +.>Representing electrical load demand;
(2) Thermal power balance constraint
Wherein:and->Respectively representing the heat generation quantity of the kth electric boiler and the h heat pump, +.>Represents the heat absorption and release quantity of the heat storage of the g-th table, < >>Representing a thermal load demand;
(3) Other constraints such as formulas (1) - (12)
5. Determining an electrical load, a thermal load and an electrical wind forecast value;
6. the output condition of each device in the electric-thermal comprehensive energy system is optimized and solved;
the optimization model is shown as follows:
wherein: f (x) is the total running cost; g (x) =0 is the equilibrium constraint in the electric-thermal integrated energy system; h (x) is an inequality constraint in the optimization problem, and comprises the operation constraint of CHP, a heat pump, an electric boiler, heat storage and fan equipment; x represents the decision variable for each period.
The optimization problem is a nonlinear multi-element function minimum problem, and the solution of the model adopts the fmincon function in MATLAB.
7. And determining a dispatching plan of a dispatching department according to the output of each device.
Example 2
In this embodiment, a typical park in northeast is selected as an object of investigation of an example, which includes 1 wind farm, 1CHP, 1 electric boiler, and 1 heat storage device. The scheduling duration is 24h, and the unit scheduling time is 1h. Typical electrical load curves, thermal load curves, wind power prediction curves for the park are shown in fig. 2. CHP, coal consumption coefficient and constraints, heat storage constraints, electric boiler constraints, heat pump constraints, price tables are shown in tables 1-6.
Compared with the prior art, the technology of the invention has the advantages and beneficial effects that the invention has, see fig. 4 and 5, that wind power is consumed before and after the utilization. Test data pair such as table 7.
TABLE 1CHP coal consumption coefficient
TABLE 2CHP constraint
TABLE 3 Heat storage constraints
TABLE 4 constraint conditions for electric boilers
Table 5 heat pump constraints
TABLE 6 price
In order to compare and analyze the influence of the method on the wind removal of the system, four modes are respectively adopted to supply heat to the system:
mode 1: the heat storage and the electric boiler do not work. The system supplies heat to the heat load by the traditional CHP unit, and the thermoelectric rigid coupling reduces the wind power internet surfing space, so that the wind discarding phenomenon is easy to occur.
Mode 2: CHP and electric boilers operate. At the moment, the CHP power-on boiler in the system supplies heat, the heat storage device is not considered, the power output of the CHP unit can be flexibly adjusted through the electric boiler, and a certain abandoned wind absorption space is provided.
Mode 3: CHP and heat pump operation. The CHP heat pump in the system supplies heat at this time.
Mode 4: the CHP, the electric boiler, the heat pump and the heat storage device supply heat cooperatively. The CHP unit, the electric boiler, the heat pump and the heat storage device in the system are considered at the same time, so that the waste wind absorption space of the power grid can be further expanded.
Table 7 shows the comparison of the system air rejection and the running cost in various modes
Table 7 test data vs. table
Comparative analysis shows that in mode 1, heat is supplied by CHP alone, the reject rate is 789.73MWh, the operation cost is 560740, and the reject rate and the operation cost of the system are high. In mode 2, an electric boiler was added to the system of mode 1, the capacity was 10MW, and the total amount of waste wind was reduced from 789.74 to 429.32MWh. The visible electric boiler is an important means for breaking the strong coupling of the heat and electricity and improving the operation flexibility so as to consume the wind power. The addition of the 10MW electric boiler can enable the CHP to operate under better working conditions, reduce the heating value and the generating capacity, and save the operation cost 188080 every day.
In mode 3, the heat pump capacity is 10MW, the waste air quantity is reduced by more than 50%, the waste air quantity is reduced to 332.45MW from 789.74MW in CHP mode, and meanwhile the operation cost is reduced by 244920.
Compared with the previous mode, the air discarding quantity of the mode 4 can be seen that the air discarding quantity and the operation cost of the system after the heat pump, the electric boiler and the heat storage are added are obviously improved. The effectiveness of the method for absorbing the abandoned wind in the electric-thermal comprehensive energy system is proved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (4)
1. A method for improving the wind-abandoning and absorbing capacity of an electric-thermal integrated energy system, which is characterized by comprising the following steps:
determining an electric-thermal comprehensive energy system structure;
determining mathematical models of all comprehensive energy system equipment according to the structure of the electric-thermal comprehensive energy system;
determining an objective function in the electric-thermal integrated energy system;
determining constraint conditions in an electric-thermal integrated energy system;
determining an electrical load, a thermal load and an electrical wind forecast value;
the output condition of each device in the electric-thermal comprehensive energy system is optimized and solved;
determining a scheduling plan of a scheduling department according to the output of each device;
the determination of the objective function in the electric-thermal integrated energy system:
wherein: f (F) chp 、F ex The operation cost, the wind abandoning punishment cost and the electricity purchasing cost of the CHP in the scheduling period are respectively represented;
(1) Cost of operation of CHP
Wherein: lambda (lambda) chp For the coal consumption price, T represents the total time period number, n represents the unit number of the CHP,the coal consumption of the ith CHP at time t is shown as follows:
wherein:is the coal consumption coefficient of the ith unit;
(2) Wind abandoning punishment cost:
because wind power has the characteristics of randomness and uncontrollable, in order to increase the wind power absorption rate, the wind discarding punishment cost is added into an objective function, as shown in the formula:
wherein:punishment of costs for wind abandon->For penalty coefficient of wind abandon, m is wind turbine number, < ->The wind discarding quantity of the jth wind turbine generator set at the moment t is represented and is equal to the wind power predicted generated energy minus the actual generated energy of wind power;
(3) Electricity purchasing cost:
adding electricity purchasing cost into an objective function, transmitting electricity to an external power grid when the generated energy of wind power is large, purchasing electricity from the external power grid when the generated energy is small, and adopting the following formula:
wherein: f (F) ex Represents the electricity purchase cost lambda ex,t 、P ex,t The electricity purchasing price and the electricity selling power at the moment t are represented;
the constraint condition in the electric-thermal comprehensive energy system is determined:
(1) Electric power balance constraint
Wherein:representing the actual power generation amount, P, of the jth fan at the time t ex,t Representing the exchange power of an external power grid, P eb,t And P hp,t Respectively representing the power consumption of the kth electric boiler and the h heat pump at the t moment, +.>Representing electrical load demand;
(2) Thermal power balance constraint
Wherein:and->Respectively representing the heat generation quantity of the kth electric boiler and the h heat pump, +.>Represents the heat absorption and release quantity of the heat storage of the g-th table, < >>Indicating the thermal load demand.
2. The method of claim 1, wherein the electric-thermal integrated energy system is a thermoelectric coupling relationship of a decoupled cogeneration unit for improving wind power receiving capacity of a power grid; the heat storage device is additionally arranged on the side of the cogeneration unit so as to achieve the aim of decoupling the thermoelectric coupling characteristic, improve the optimal configuration capacity of the power system and enhance the capacity of the power grid for absorbing abandoned wind; and an electric boiler and a heat pump are arranged on the load side of the power grid and are used for realizing coordinated heat supply and achieving the purposes of heat supply and wind disposal elimination.
3. The method of claim 1, wherein the mathematical model of each integrated energy system device is determined from the electro-thermal integrated energy system structure as follows:
(1) Constraint of wind turbine generator system:
wherein:for the actual power generation amount of the wind power at the moment t, P wind,t The predicted generating capacity of the wind power at the moment t;
(2) CHP constraint:
wherein: p (P) chp,t And Q chp,t The electric power and the thermal power representing CHP at time t;and->Representing the lower and upper limit of CHP electric power,/->And->Representing lower and upper limits of CHP thermal power;
max(C v ·Q chp,t +P chp,D ,C m ·Q chp,t +P chp,C ≤P chp,t ≤C v ·Q chp,t +P chp,A ) (11)
wherein: c (C) v ，P chp,D ，C m ，P chp,C And P chp,A The thermoelectric coupling parameter is the thermoelectric coupling parameter of the CHP and represents the thermoelectric coupling relation between the electric power and the thermal power of the CHP;
(3) Heat storage constraint:
R s,t -R s,t-1 -Q loss,t ＝Q s,t (12)
wherein: r is R s,t Representing the total heat stored at time t, Q loss,t Indicating heat loss at time t, Q s,t Heat that absorbs/releases heat at time t; η (eta) s Representing a loss factor;
wherein:and->Representing the lower and upper limit of the heat storage capacity of the heat storage, < + >>And->A lower limit and an upper limit of heat storage and absorption heat are indicated;
(4) Heat pump constraints:
Q hp,t ＝COP·P hp,t (16)
wherein:and->Representing a lower limit and an upper limit of heat pump heat output; q (Q) hp,t Representing the heat output of the heat pump at time t, P hp,t Representing the electrical power of the heat pump; the coefficient of performance (COP) of a heat pump defines the ratio between its heat output and electric power;
(5) Electric boiler constraint:
the electric boiler generates heat by consuming electric energy, and the constraints are expressed as follows:
Q eb,t ＝η eb ·P eb,t (19)
wherein:and->Showing the lower and upper limits of the heat output of the electric boiler, and eta eb Is the relation between the electric power and the heat output of the electric boiler.
4. The method of claim 1, wherein the solving device output condition is optimized: the optimization model is shown as follows:
wherein: f (x) is the total running cost; g (x) =0 is the equilibrium constraint in the electric-thermal integrated energy system; h (x) is an inequality constraint in the optimization problem, and comprises the operation constraint of CHP, a heat pump, an electric boiler, heat storage and fan equipment; x represents a decision variable for each period;
the optimization problem is a nonlinear multi-element function minimum problem, and the solution of the model adopts the fmincon function in MATLAB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011428333.6A CN112736984B (en) | 2020-12-09 | 2020-12-09 | Method for improving wind-abandoning and absorbing capacity of electric-thermal comprehensive energy system |
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