CN111210080B - Hybrid ocean energy multi-energy complementary energy hub and joint regulation and control method - Google Patents
Hybrid ocean energy multi-energy complementary energy hub and joint regulation and control method Download PDFInfo
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Abstract
The invention discloses a hybrid ocean energy multifunctional complementary energy hub and a joint regulation and control method. According to the technical scheme, the complementary characteristics of different ocean energy resources are utilized to establish the energy conversion and coupling relation between different ocean energy, so that the stability of the system is maintained while new energy is consumed, and the benefit is maximized.
Description
Technical Field
The invention relates to the technical field of energy, in particular to a hybrid ocean energy multi-energy complementary energy hub and a hybrid ocean energy multi-energy complementary energy hub joint regulation method.
Background
At present, research on ocean energy multifunctional complementary systems at home and abroad mainly focuses on design and optimization of ocean energy utilization devices, such as ocean energy power generation devices, acquisition devices, ocean energy utilization rate improving devices and the like, and the devices aim at improving the utilization rate of single energy sources. Some researchers propose multi-production systems based on comprehensive ocean energy utilization systems, which can utilize various ocean energies to provide a plurality of useful products such as electric power, hydrogen, fresh water and the like, but mainly research and utilize one ocean energy to obtain various products as much as possible, and the complementary characteristics of the utilized ocean energy resources are not strong.
Disclosure of Invention
The invention mainly aims to provide a hybrid ocean energy multifunctional complementary energy hub and a combined regulation and control method thereof, and aims to solve the problem that the complementary characteristics of different ocean energy resources utilized by the existing ocean energy multifunctional complementary system are not strong.
In order to achieve the aim, the invention provides a hybrid ocean energy multi-energy complementary energy hub joint regulation and control method which comprises an ocean energy multi-energy coupling system, and a tidal power generation system, an offshore wind power generation system, an offshore photovoltaic heat collection system, an ocean temperature difference power generation system and an energy storage system which are respectively connected with the ocean energy multi-energy coupling system, wherein the ocean energy multi-energy coupling system comprises an electric heating device, an electric refrigerating device and a thermal refrigerating device.
Preferably, the energy storage system comprises a heat storage device, a cold storage device and an electric storage device which are all connected with the ocean energy multifunctional coupling system, wherein the electric storage device comprises a water suction pump and a tidal energy reservoir which is connected with the water suction pump and used for pumping energy storage; the ocean temperature difference power generation system comprises a turbine, a condenser, a water feeding pump and an evaporator which are connected in a closed loop, wherein the evaporator is connected with a set warm seawater pump, the condenser is connected with a set cold seawater pump, and an output shaft of the turbine is connected with a set generator.
The invention also comprises a hybrid ocean energy multifunctional complementary energy hub joint regulation method, which comprises the following steps:
according to the energy flow rule of the energy hub and the energy hub, establishing an energy coupling matrix and an energy hub constraint condition which is met by the energy coupling matrix;
according to the energy coupling matrix, the energy hub constraint condition, the bidding strategy of the energy hub and the independent clearing flow of the electric market, the hot market and the cold market which are added by the energy hub and are not affected by each other, respectively establishing an electric market independent clearing model, a hot market independent clearing model and a cold market independent clearing model;
establishing a profit model of the energy hub according to the energy coupling matrix, the constraint condition of the energy hub, the independent electric market clearing model, the independent hot market clearing model and the independent cold market clearing model;
and solving the profit model to obtain an optimal scheduling strategy of the energy hub, and regulating and controlling the energy hub according to the optimal scheduling strategy.
Preferably, the step of establishing an energy coupling matrix and energy hub constraint conditions according to the energy hub and the energy flow rule of the energy hub includes:
According to the energy hub and the energy flow rule of the energy hub, the coupling relation and the coupling efficiency among the electric power, the hot power and the cold power are obtained;
establishing an energy coupling matrix describing the coupling relation among the electric power, the hot power and the cold power of the energy hub according to the coupling relation among the electric power, the hot power and the cold power and the coupling efficiency;
and establishing energy hinge constraint conditions which are required to be met by the energy coupling matrix according to the energy coupling matrix, the coupling relation among the electric power, the hot power and the cold power and the coupling efficiency.
Preferably, the step of establishing an electric market separate clearing model, a thermal market separate clearing model and a cold market separate clearing model according to the energy coupling matrix, the energy hub constraint condition and the bidding strategy of the energy hub, and separate clearing flows of the electric market, the thermal market and the cold market which are added by the energy hub and are not mutually influenced, respectively, includes:
acquiring bidding strategies of energy hubs, and adding independent clearing processes of an electric market, a hot market and a cold market which are not affected by each other into the energy hubs;
establishing an independent electric market clearing model according to an electric market bidding strategy of the energy hub and an independent electric market clearing flow;
Establishing a hot market individual clearing model according to a hot market bidding strategy of the energy hub and an individual clearing flow of a hot market;
and establishing a cold market individual clearing model according to the cold market bidding strategy of the energy hub and the individual clearing flow of the cold market.
Preferably, the step of establishing an independent electric market clearing model according to the electric market bidding strategy of the energy hub and the independent electric market clearing flow comprises the following steps:
acquiring a power transmission network structure added by the energy hub;
acquiring the electricity generation cost of suppliers of an electricity market, the cost of purchasing electric energy from the energy hub and the income of selling the electric energy to the energy hub according to the electricity market bidding strategies of the power transmission network structure and the bidding strategies of the energy hub;
establishing an electric market objective function of an electric market independent clearing model of the electric market with the lowest cost and the electric market meeting the load according to the power generation cost of suppliers of the electric market, the cost of purchasing electric energy from an energy hub and the income of selling electric energy to the energy hub;
and establishing an electric market constraint condition of the electric market independent clearing model according to the added transmission network structure.
Preferably, the step of establishing a separate hot market clearing model according to the hot market bidding strategy of the energy hub and the separate hot market clearing flow comprises the following steps:
acquiring a heat transmission network structure added by the energy hub;
the hot market bidding strategy according to the bidding strategies of the heat transmission network structure and the energy hub obtains the heating cost of suppliers of the hot market and the cost of purchasing heat energy from the energy hub;
establishing a thermal market objective function of a separate heat market clearing model of the thermal market with the lowest cost and the thermal market meeting the load according to the heating cost of suppliers of the thermal market and the cost of purchasing heat energy from an energy hub;
and establishing a thermal market constraint condition of the thermal market independent clearing model according to the added thermal transmission network structure.
Preferably, the step of establishing a separate clear model of the cold market according to the cold market bidding strategy of the energy hub and the separate clear flow of the cold market includes:
acquiring a cold transmission network structure added by the energy hub;
acquiring the cooling cost of suppliers of a cold market and the cost of purchasing cold energy from an energy hub according to the cold-transmission network structure and a cold-market bidding strategy of the energy hub;
Establishing a cold market objective function of a separate cold market clearing model of the cold market which meets load and has the lowest cost according to the cooling cost of suppliers of the cold market and the cost of purchasing cold energy from an energy hub;
and establishing a cold market constraint condition of the cold market independent clearing model according to the added cold transmission network structure.
Preferably, the step of establishing a profit model of the energy hub according to the energy coupling matrix and the energy hub constraint condition, the electric market separate drawing model, the hot market separate drawing model, and the cold market separate drawing model includes:
acquiring the profit of the energy hub and the electric market, the profit of the energy hub and the heat market and the profit of the energy hub and the cold energy market, and establishing a profit objective function of a profit maximum profit model of the energy hub;
and establishing profit constraint conditions of the profit model according to the energy coupling matrix, the energy hub constraint condition, the electric market independent clearing model, the hot market independent clearing model and the cold market independent clearing model.
Preferably, the step of solving the profit model to obtain an optimal scheduling policy of the energy hub, and adjusting the energy hub according to the optimal scheduling policy includes:
Acquiring the supply quantity and bidding price respectively corresponding to the electric energy, the heat energy and the cold energy of the energy hub at the same time by utilizing an optimization method according to the profit model, and performing multi-market combined bidding;
and according to the supply quantity corresponding to the electric energy, the heat energy and the cold energy of the energy hub at the same time and the generation quantity of the electric energy, the heat energy and the cold energy of the energy hub, scheduling the stored energy in the energy hub and utilizing various energy conversion devices to couple in multiple energy forms.
According to the technical scheme, the complementary characteristics of different ocean energy resources are utilized to establish the energy conversion and coupling relation between different ocean energy, so that new energy is consumed while the stability of the system is maintained, and the benefit is maximized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a hybrid ocean energy multifunctional complementary energy hub joint regulation method according to the invention.
Fig. 2 is a schematic diagram of the structure of the energy hub of the present invention.
FIG. 3 is a graph showing the variation of the water surface height of the falling tide power generation.
FIG. 4 is a graph showing the change of the water surface height after the pumped storage according to the present invention is added.
Fig. 5 is a diagram of OTEC architecture of the ocean thermal power generation system of the present invention.
FIG. 6 is a graph of winter season wind power generation daily output prediction.
Fig. 7 is a graph of winter photovoltaic heat generation sunrise prediction.
Fig. 8 is a graph of winter tidal power generation sunrise prediction.
Fig. 9 is a winter electrical load prediction graph.
Fig. 10 is a winter heat load prediction graph.
Fig. 11 is a graph of real-time electricity price prediction.
Fig. 12 is a graph of bid prices.
FIG. 13 is a graph of bid and bid amount.
Fig. 14 is a pumped storage charge-discharge graph.
Fig. 15 is a graph of thermal storage tank charge and discharge energy.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.
The invention provides a hybrid ocean energy multifunctional complementary energy hub which comprises an ocean energy multifunctional coupling system, and a tidal power generation system, an offshore wind power generation system, an offshore photovoltaic heat collection system, an ocean temperature difference power generation system and an energy storage system which are respectively connected with the ocean energy multifunctional coupling system, wherein the ocean energy multifunctional coupling system comprises an electric heating device, an electric refrigerating device and a thermal refrigerating device.
According to the technical scheme, the complementary characteristics of different ocean energy resources utilized in the existing ocean energy multi-energy complementary system are enhanced, the energy conversion and coupling relation between different ocean energies is established, the stability of the system is maintained while new energy is consumed, and the benefit is maximized.
The power generated by the specific ocean temperature difference power generation system, the tidal power generation system and the offshore wind power generation system is connected with the output end of an energy hub through a transformer, the power output end of the energy hub is connected with a boiler, a water pump, a compression refrigerator and a power market, the water pumping end of the water pump is connected with the sea, the water outlet end of the water pump is a tidal energy reservoir, the heat energy output end of the energy hub is connected with the water outlet ends of a heat storage tank, the boiler and an offshore photovoltaic heat collection system (such as a flat-plate solar collector), and the cold energy output end of the energy hub is connected with a cold sea water pump, a cold storage tank, an absorption refrigerator and a compression refrigerator.
In particular, in a tidal power generation system, tide is a natural phenomenon that periodically fluctuates on the ocean water surface under the action of the sun and moon attraction. By creating a barrage in the bay or estuary, a tidal energy reservoir is formed. Under the action of tides, the water surface of the tidal energy reservoir and the sea surface form a height difference, and the tidal turbine set can be driven to generate electricity by controlling the switch of the gate by utilizing the height difference.
As shown in fig. 3, the tidal energy reservoir level and sea level changes during power generation.
Here we use a falling tide power generation mode, a complete falling tide power generation process comprising four phases: water inflow, waiting, power generation and waiting. The specific processes of the four stages are as follows:
(1) As shown in FIG. 3A-B, in the tide period, when the water head (referring to the mechanical energy of the liquid in unit weight) is zero, the sluice is opened, the sea water enters the tidal energy reservoir through the sluice, the water head is increased and then decreased, and when the water head is decreased to zero again, the sluice is closed.
(2) As shown in fig. 3B-C, the gate and the turbomachine remain closed, awaiting the next stage of action.
(3) As in fig. 3C-D, at this time during the falling tide. When the water head reaches the optimal value, the gate and the turbine set are opened, water is discharged outwards at the moment to drive the turbine set to generate power, the water level in the tidal energy reservoir is reduced, and the gate and the turbine are closed until the water head reaches the minimum value.
(4) As shown in fig. 3D-E, the gate and the turbine are kept closed, while in the tide phase, until the water head is zero, and the next cycle is entered.
The calculation power generation expression is:
P TE ＝ρgQ T Hη；
wherein: p (P) TE For generating power, ρ is sea water density, g is gravitational acceleration, Q T For the water flow through the turbine group, H is the head value, η is the efficiency factor of the turbine group (a particular turbine group has its unique characteristic curve from which a Q corresponding to a certain H value can be found T The value and eta value can obtain the sea level height change rule and the water head change rule through a large amount of data, thereby obtaining the tidal power generation output.
The offshore wind power generation system can predict the offshore wind power generation output by a convolution neural network method through a large amount of historical data to obtain an offshore wind power output curve.
The energy storage system comprises a heat storage device, a cold storage device and an electric storage device which are all connected with the ocean energy multifunctional coupling system, wherein the electric storage device comprises a water pump and a tidal energy reservoir which is connected with the water pump and used for pumping energy storage; the ocean temperature difference power generation system comprises a turbine, a condenser, a water feeding pump and an evaporator which are connected in a closed loop, wherein the evaporator is connected with a set warm seawater pump, the condenser is connected with a set cold seawater pump, and an output shaft of the turbine is connected with a set generator.
According to the technical scheme, the hub is coupled with ocean temperature difference energy, offshore wind energy and tidal energy, the whole system is regulated by pumping energy storage, hot storage tanks, cold storage tanks and buying and selling electric energy in the electric energy market, the space-time coupling characteristics among different energy sources are considered in the built system, ocean energy multi-energy complementation is truly realized, and the system can realize continuous and stable production of electricity, heat and cold by only utilizing the ocean energy.
Solar energy is utilized by an offshore photovoltaic heat collection system (for example, a flat-plate solar heat collector), and the output formula is as follows:
Q FPSC ＝F R A[I s (τα)A-U L (T FPSC -T 0 )]；
wherein: f (F) R Is the heat dissipation coefficient; a is the surface area of the flat-plate solar collector; i s Is the intensity of solar radiation; τ is the coupling efficiency; alpha is the absorption coefficient of the heat collector; u (U) L Is the total heat loss coefficient of the heat collector; t (T) FPSC Is the collector temperature; t (T) 0 And the predicted output of the photovoltaic power generation can be obtained by predicting the solar radiation intensity as the reference temperature.
As shown in fig. 5, the ocean temperature difference power generation system is characterized in that a warm sea water suction pump pumps surface sea water heated by solar energy (warm sea water) into sea water heated by an offshore photovoltaic heat collection system, and then the sea water passes through an evaporator to change a low-boiling point working fluid working medium (such as ammonia water) in a closed circulation system into a gaseous state, and the gaseous working medium is used for pushing a turbine group, so that power generation can be realized. The working medium after power generation can be cooled by cold seawater with very low temperature pumped by a cold seawater suction pump and is changed into fluid to form a cycle (Rankine cycle).
The energy calculation formula of ocean temperature differential power generation (OTEC) is:
(1) A turbomachine:
conservation of water flow:
conservation of energy:
wherein: w (W) T Electric power emitted for the turbomachine; η (eta) T Generating efficiency for the turboset;
the mass flow of working medium flowing out of the evaporator; />
For the mass flow of working fluid out of the turbomachine; h is a 1 For the enthalpy value of the working medium flowing out of the evaporator, h 2 Enthalpy of working medium flowing out of the turbomachine.
(2) And (3) a condenser:
conservation of water mass flow:
m c ＝m c ′；
conservation of energy:
wherein:
the mass flow of working medium flowing out of the condenser; h is a 3 Enthalpy of working medium flowing out of the condenser; />
Mass flow of cold seawater out of the condenser; h is a c Enthalpy for the cold seawater exiting the condenser; />
Mass flow of cold seawater out of the condenser; h is a c ' is the enthalpy of the cold seawater exiting the condenser.
(3) Water supply pump:
conservation of water mass flow:
conservation of energy:
wherein:
the mass flow of working medium flowing out of the water feed pump; h is a 4 Enthalpy value for working medium flowing out of the feed pump; wherein the method comprises the steps of
Useful power for the feedwater pump.
(4) An evaporator:
conservation of water mass flow:
wherein:
a mass flow rate of the hot seawater exiting the evaporator; h is a h ' enthalpy of warm sea water exiting the evaporator, " >
A mass flow rate for the hot seawater flowing into the evaporator; h is a h Is the enthalpy of the hot seawater flowing into the evaporator.
In the entire ocean thermal power generation (OTEC) system:
the mass flow of working medium in the whole ocean temperature difference power generation (OTEC) system is a certain value, which is defined as
Wherein:
useful power for the feedwater pump; let the thermal power flowing into the ocean temperature difference power generation (OTEC) system be
The cold power flowing into ocean thermal power generation (OTEC) is +.>
W T Electric power emitted for the turbomachine; η (eta) T Is the generating efficiency of the turbine group.
And when the temperature of the warm sea water is lower than the supply temperature, the warm sea water flows into the evaporator to participate in thermoelectric power generation. The cold seawater pumped by the cold seawater suction pump not only can be used as cooling water of the condenser, but also can be directly sold to markets, such as seafood fresh-keeping, air conditioning, cultivation, pharmacy and the like; a hot refrigeration section in the system, such as: the hot seawater can be refrigerated by an absorption refrigerator; an electric cooling section such as: the compression refrigerator completes refrigeration; an electric heating section such as: the seawater is heated by the boiler using electric energy.
Specifically, surplus hot seawater can be stored in a hot storage tank, surplus cold seawater can be stored in a cold storage tank, a tidal energy reservoir is connected with a water suction pump, and when ocean energy is excessively generated or market electricity is cheap, surplus generated energy or electric energy purchased from the market can be stored in the tidal energy reservoir through the water suction pump.
Referring to fig. 1 and 2, in order to achieve the above objective, the present invention provides a hybrid ocean energy and energy complementary energy hub joint control method, which includes the following steps:
s100, establishing an energy coupling matrix and an energy hinge constraint condition which is met by the energy coupling matrix according to an energy hinge and an energy flow rule of the energy hinge;
s200, respectively establishing an electric market separate clearing model, a thermal market separate clearing model and a cold market separate clearing model according to the energy coupling matrix, the energy hub constraint condition, the bidding strategy of the energy hub and the separate clearing flow of the electric market, the thermal market and the cold market which are added by the energy hub and are not mutually influenced;
s300, establishing a profit model of the energy hub according to the energy coupling matrix, the constraint condition of the energy hub, the independent electric market clearing model, the independent hot market clearing model and the independent cold market clearing model;
S400, solving the profit model to obtain an optimal scheduling strategy of the energy hub, and regulating and controlling the energy hub according to the optimal scheduling strategy.
According to the technical scheme, a novel ocean multi-energy complementary energy hub different energy conversion equation, a coupling matrix and constraint conditions are established, multi-market joint bidding is carried out, multi-market clear constraint conditions and income objective functions are established, real-time optimal scheduling is carried out under the condition that the multi-market clear constraint conditions and the constraint conditions of the energy hub are met, and the income objective functions are maximized while ocean energy is consumed.
Referring to fig. 1, in a first embodiment of a hybrid marine energy and multi-energy complementary energy hub joint regulation method according to the present invention, in a second embodiment of the hybrid marine energy and multi-energy complementary energy hub joint regulation method according to the present invention, the step S100 includes the following steps:
s110, acquiring a coupling relation and coupling efficiency among electric power, hot power and cold power according to an energy hub and an energy flow rule of the energy hub;
s120, establishing an energy coupling matrix describing the coupling relation among the electric power, the thermal power and the cold power of the energy hub according to the coupling relation among the electric power, the thermal power and the cold power and the coupling efficiency;
S130, establishing energy hinge constraint conditions which are required to be met by the energy coupling matrix according to the energy coupling matrix, the coupling relation among the electric power, the hot power and the cold power and the coupling efficiency.
Specifically, the energy coupling matrix is:
wherein: p (P) gp Representing the electric power output by the energy hub; p'. H Representing the thermal power output by the energy hub; p'. C Representing the cold power output by the energy hub; f (f) TE Representing a tidal power generation output function; f (f) WT Representing an offshore wind power output function; η (eta) B Indicating the efficiency of the electric boiler; η (eta) C Representing the efficiency of the compression refrigerator; η (eta) HP Indicating the working efficiency of the warm seawater suction pump; η (eta) CP Indicating the working efficiency of the cold seawater suction pump; η (eta) FP Indicating the working efficiency of the feed pump; η (eta) HC Representing the operating efficiency of an absorption chiller; η (eta) OH Representing the efficiency of the ocean thermal power generation system to convert the input thermal power into electrical power; η (eta) OC Representing the efficiency of the ocean thermal power generation system to convert cold power to electrical power; η (eta) OF Representing the efficiency of the ocean temperature difference power generation system in converting the energy consumed by the feed pump into electric power; w (W) TE Representing the tidal power plant producing electrical power; w (W) WT Representing the power of the offshore wind power generation; q (Q) FPSC Representing the thermal power of a flat-panel solar collector; p (P) dp Representing the purchase of electrical power from the market; p (P) BESS Representing the difference of pumped storage discharge power minus charge power; p (P) HBES Representing the difference of the thermal storage tank discharge power minus the charge power; p (P) CBES Representing the difference of the cold storage tank discharge power minus the charge power; s is S B Representing the output thermal power of the electric boiler; s is S C Representing the cold power output by the compression refrigerator; p (P) HP Representing the useful power of the warm seawater suction pump; p (P) CP Representing the useful power of the cold seawater suction pump; s is S HC Indicating the output cold power of the absorption chiller; w (W) T Representing the electrical power emitted by the turbomachine, P OH Representing the thermal power input into the ocean thermal power generation system, P OC Representing the cold power input into the ocean thermoelectric generation system, P FP Indicating the energy consumed by the feed pump.
The ocean temperature difference power generation system has the efficiency of converting input thermal power into electric power as follows:
efficiency of the ocean thermal power generation system to convert input thermal power into electrical power:
efficiency of the ocean temperature difference power generation system in converting energy consumed by the feed pump into electric power:
the constraint conditions of the energy hub are as follows:
0≤P gp,t ≤P gp,max ；
wherein: wherein P is gp,max Indicating the maximum electric power, P, desired to be provided by the energy hub gp,t Indicating energy hub liftingAnd the supplied electric power.
0≤P H,t ≤P H,max ；
Wherein: p (P) H,max Indicating the maximum thermal power, P, desired to be provided by the energy hub H,t Representing the thermal power provided by the energy hub.
g s,turbine,t ≤g s,turbine,max ；
g s,pump,t ≤g s,pump,max ；
0≤Storage E,t ≤Storage E,max ；
Storage E,t ＝Storage E,t-Δt +g s,pump,t -g s,turbine,t ；
Wherein: g s,turbine,t The output force of the pumped storage turbine set at the time t is represented; g s,turbine,max The maximum output force of the pumped storage turbine at the moment t is represented; g s,pump,t The output force of the pumped storage water pump at the moment t is represented; g s,pump,max The maximum output force of the pumped storage water pump at the moment t is shown; storage device E,t Representing the pumped storage energy at the time t; storage device E,t-Δt Representing the pumped storage energy at the time t-delta t; storage device E,max Representing the pumped-storage maximum stored energy.
P H,charge,t ≤P H,charge,max ；
P H,discharge,t ≤P H,discharge,max ；
0≤Storage H,t ≤Storage H,max ；
Storage H,t ＝Storage H,t-Δt +P H,charge,t -P H,discharge,t ；
Wherein: p (P) H,charge,t Representing the heat storage power of the heat storage tank at the time t; p (P) H,charge,max Representing the maximum thermal power stored in the thermal storage tank; p (P) H,discharge,t The heat storage tank heat release power at the time t is represented; p (P) H,discharge,max Representing the maximum heat release power of the heat storage tank; storage device H,t Representing the energy stored in the heat storage tank at the time t; storage device H,t-Δt Representing the energy stored in the heat storage tank at the time t-delta t; storage device H,max Representing thermal storageThe tank stores maximum energy.
P C,charge,t ≤P C,charge,max ；
P C,discharge,t ≤P C,discharge,max ；
0≤Storage C,t ≤Storage C,max ；
Storage C,t ＝Storage C,t-Δt +P C,charge,t -P C,discharge,t ；
Wherein: p (P) C,charge,t The cold storage power of the cold storage tank at the moment t is represented; p (P) C,charge,max Indicating the maximum cold power stored in the cold storage tank; p (P) C,discharge,t The cold power of the cold storage tank at the time t is represented; p (P) C,discharge,max Indicating the maximum cold power of the cold storage tank; storage device C,t Representing the energy stored in the heat storage tank at the time t; storage device C,t-Δt Representing the energy stored in the heat storage tank at the time t-delta t; storage device C,max Representing the maximum stored energy of the thermal storage tank.
0≤S B,t ≤S B,max ；
0≤W T,t ≤W T，max ；
0≤S C,t ≤S C,max ；
0≤S HC,t ≤S HC,max ；
0≤P HP,t ≤P HP,max ；
0≤P CP,t ≤P CP,max ；
Wherein: s is S B,t The output thermal power of the electric boiler at the time t is shown; s is S B,max Representing the maximum output thermal power of the electric boiler; w (W) T Representing the electric power emitted by the turboset at time t; w (W) T，max Representing the maximum electrical power emitted by the turbomachine; s is S C,t The cold power output by the compression refrigerator at the time t is shown; s is S C,max Representing the maximum cold power output by the compression refrigerator; s is S HC The output cold power of the absorption refrigerator at the time t is shown; s is S HC,max Represents the maximum output cold power of the absorption refrigerator; p (P) HP The useful power of the warm sea water suction pump at the moment t is shown; p (P) HP,max Representing warm seawater pumpingMaximum useful power of the pump; p (P) CP The useful power of the cold sea water suction pump at the time t is shown; p (P) CP,max Indicating the maximum useful power of the cold seawater suction pump.
Referring to fig. 1, in a third embodiment of the hybrid marine energy multi-energy complementary energy hub joint regulation method according to the present invention, the step S200 includes:
s210, acquiring bidding strategies of an energy hub and independent clearing flows of an electric market, a hot market and a cold market which are added by the energy hub and are not affected by each other;
s220, establishing an independent clearing model of the electric market according to the electric market bidding strategy of the energy hub and the independent clearing flow of the electric market;
S230, establishing a separate clearing model of the hot market according to the hot market bidding strategy of the energy hub and the separate clearing flow of the hot market;
s240, establishing a cold market individual clearing model according to the cold market bidding strategy of the energy hub and the individual clearing flow of the cold market. Specifically, in the bidding process, firstly, market operators and other bidders of the energy hub provided by the patent submit respective bidding strategies (how much energy and price are expected to be provided) to each trading market, and then each trading market operator performs market clearing by the optimal power flow problem, the optimal heat flow problem and the optimal cold flow problem, so that trading market cost is minimized on the premise of meeting the load, and three trading market clearing operators do not influence each other. The energy hub operator provides energy according to the signed agreement according to the market clearance of the transaction, and obtains benefits according to the signed agreement.
Due to the volatility of ocean energy output, it is highly likely that the energy of the agreement cannot be provided on time after the agreement is entered into with the trade market. However, when the energy supply cannot meet the protocol requirement due to insufficient output of one ocean energy source, the ocean energy multifunctional complementary energy hub can be complemented by the surplus output of another ocean energy source or multiple ocean energy sources or by corresponding conversion of stored energy, so that the complementary energy supply is performed by utilizing the space-time coupling of ocean energy of different types.
Referring to fig. 1, in a fourth embodiment of the hybrid marine energy multi-energy complementary energy hub joint regulation method according to the present invention, the step S220 includes:
s221, acquiring a power transmission network structure added by the energy hub;
s222, acquiring the electricity generation cost of suppliers of the electric market, the cost of purchasing electric energy from the energy hub and the income of selling the electric energy to the energy hub according to the electric market bidding strategy of the power transmission network structure and the energy hub;
s223, establishing an electric market objective function of an electric market independent clearing model of which the electric market meets the load and has the lowest cost according to the electric power generation cost of suppliers of the electric market, the cost of purchasing electric energy from the energy hub and the electric energy income sold to the energy hub;
s224, establishing the electric market constraint condition of the electric market independent clearing model according to the added transmission network structure.
Specifically, the trend constraints of the electric market are:
wherein: p (P) ij Representing the active power flowing from node j to node i; p (P) im Indicating the existence of a flow from node j to node mA power; q (Q) ij Representing the reactive power of node j flowing to node i; q (Q) im Representing reactive power flowing from node i to node m;
representing the active power injected into node i; />
Representing the active power provided by node i outwards; />
Representing reactive power injected into node i; />
Representing the reactive power provided by node i outwards; u (U) i Representing the voltage magnitude of node i; u (U) j Representing the voltage magnitude of node j; u (U) 0 Representing the voltage magnitude of the balancing node; r is (r) ij Representing the magnitude of the branch resistance from node j to node i; x is x ij Representing the magnitude of the branch reactance from node j to node i;
the electric market meets the electric market objective function of the electric market independent clearing model with lowest load and cost:
wherein:
generating electricity for suppliers in the electricity market, m i 、n i Coefficients that are quadratic functions of the power generation cost and the power generation power; δP gp For the cost of purchasing electrical energy from the energy hub, delta is the price of agreed electricity, < >>
Representing the active power injected into node i, P gp To purchase electrical energy; χP (χ) dp To sell to energy resource junctionElectric energy income, χ is selling price of electric energy, P dp To sell electrical energy.
The electric market objective function (matrix form) of the electric market individual clearing model, which meets the load and has the lowest cost, is:
the electrical market constraints are:
A p p+B p x＝b p ；
C p p+D p x≤d p (P gp,max ,P dp,max )；
Wherein: wherein p is formed by
P gp And P dp A matrix of formations; a is that p 、B p 、b p 、C p 、D p And d p For a constant coefficient matrix, x is the residual variable (any quadratic function can be written in matrix form, which is typically in the form +.>
Q p Is a coefficient matrix with quadratic function written in matrix form>
Also a coefficient matrix, which is related to δ and χ).
Referring to fig. 1, in a fifth embodiment of the hybrid marine energy complementary energy hub joint control method according to the present invention, the step S230 includes:
s231, acquiring a heat transmission network structure added by the energy hub;
s232, acquiring the heating cost of suppliers of the thermal market, the cost of purchasing heat energy from the energy hub and the income of selling heat energy to the energy hub according to the thermal market bidding strategy of the heat transmission network structure and the energy hub;
s233, establishing a thermal market objective function of a separate heat market clearing model of the thermal market with the lowest cost and the thermal market meeting the load according to the heating cost of suppliers of the thermal market and the cost of purchasing heat energy from an energy hub;
s234, establishing the thermal market constraint condition of the thermal market independent clearing model according to the added heat transfer network structure.
Specifically, the heat market operator is similar to the heat market in clearing, a trend constraint of the corresponding heat market is established, and a heat market objective function of the heat market independent clearing model with the heat market meeting the load and the lowest cost is established;
thus, the thermal market objective function (in matrix form) of the thermal market alone model is:
the thermal market constraints are:
wherein P is H Is a matrix formed by injecting thermal power and selling thermal energy into a heating network node, gamma is protocol heating unit price,
the (vector) is the mass flow of water in the heat supply pipe (here it is assumed that +.>
Is a fixed value); a is that H 、b H 、C H And d H As a constant coefficient matrix, B H And D H Is composed of->
Determined constant coefficient matrix, κ H Is a vector containing all the temperature variables in the heating system.
Referring to fig. 1, in a sixth embodiment of the hybrid marine energy complementary energy hub joint control method according to the present invention, the step S240 includes:
s241, acquiring a cooling network structure added by the energy hub;
s242, obtaining the cooling cost of suppliers of the cold market, the cost of purchasing cold energy from the energy hub and the income of selling the cold energy to the energy hub according to the cold market bidding strategy of the cold transmission network structure and the bidding strategy of the energy hub;
S243, establishing a cold market objective function of a separate cold market clearing model of the cold market with the lowest cost and the load satisfied by the cold market according to the cooling cost of suppliers of the cold market and the cost of purchasing cold energy from an energy hub;
s244, establishing a cold market constraint condition of the cold market independent clearing model according to the added cold transmission network structure.
Specifically, the cold energy market operator goes out to clear similar to the electric market, establishes the trend constraint of the corresponding cold energy market, and establishes the cold energy market objective function of the cold energy market independent out-clearing model with the cold energy market meeting the load and the lowest cost;
therefore, the cold market objective function (matrix form) of the cold market independent model is:
the cold energy market constraint conditions are as follows:
wherein: p (P) C Is a matrix formed by injecting cold power and selling cold energy by the cold supply network nodes, epsilon is the protocol cold supply unit price,
the (vector) is the mass flow of water in the cold supply pipe, (here it is assumed that +.>
Constant value), A C 、b C 、C C And d C As a constant coefficient matrix, B C And D C Is composed of->
Determined constant coefficient matrix, κ C Is a vector containing all the temperature variables in the cooling system.
Referring to fig. 1, in a seventh embodiment of the hybrid marine energy multi-energy complementary energy hub joint regulation method according to the present invention, the step S300 includes:
S310, acquiring the trading profits of the energy hub and the electric market, the trading profits of the energy hub and the heat market and the trading profits of the energy hub and the cold energy market, and establishing a profit objective function of a profit maximum profit model of the energy hub;
s320, establishing profit constraint conditions of the profit model according to the energy coupling matrix, the energy hub constraint conditions, the electric market separate clearing model, the heat market separate clearing model and the cold market separate clearing model.
Specifically, the profit objective function is:
max(δ) T P gp +(γ) T P' H +(ε) T P' C -(χ) T P dp ；
wherein: (delta) T P gp Cost of selling electric energy for energy hub (gamma) T P' H Cost of selling thermal energy for energy hub (ε) T P' C Cost of selling cold energy for energy hub, (χ) T P dp And purchasing electrical energy income for the energy hub.
Constraints of the profit objective function include: the constraints of the energy coupling matrix, the electrical market constraints, the thermal market constraints, and the cold energy market constraints.
Referring to fig. 1, in an eighth embodiment of the hybrid marine energy multi-energy complementary energy hub joint control method according to any one of the third to ninth embodiments of the hybrid marine energy multi-energy complementary energy hub joint control method according to the present invention, the step S400 includes:
S410, acquiring supply quantities and bidding prices respectively corresponding to the electric energy, the heat energy and the cold energy of the energy hub at the same time by utilizing an optimization method according to the profit model, and performing multi-market joint bidding;
s420, scheduling energy storage in the energy hub according to the supply quantity corresponding to the electric energy, the heat energy and the cold energy of the energy hub and the generation quantity of the electric energy, the heat energy and the cold energy of the energy hub at the same time, and coupling in multiple energy forms by utilizing various energy conversion devices.
Specifically, according to the profit model, an optimization method is utilized, according to the predicted three ocean energy output, winter electric load and real-time electric price, an optimal multi-market combined bidding strategy is calculated by utilizing the profit model, and the optimal multi-market combined bidding strategy comprises a curve of bidding price changing along with time and bidding sales. The energy conversion or storage between the energy sources of the energy hub is controlled under the bidding strategy.
As shown in fig. 6 to 15, in a specific embodiment, an example analysis is performed, the designed energy hub is added into an IEEE33 node power distribution network system, a heating system and a cooling system, and in winter, a model writing program is used for performing optimization calculation to obtain an optimal bidding and scheduling scheme, so that profit is maximized. FIG. 6 is a predicted wind winter sunrise curve; FIG. 7 is a graph of predicted photovoltaic winter sunrise force; FIG. 8 is a graph of predicted tidal winter day power generation output; FIG. 9 is a winter electrical load; FIG. 10 is a winter electrical load curve; FIG. 11 is a real-time electricity price curve; and according to the predicted three ocean energy output, winter electric load curve and real-time electric price curve, obtaining an optimal multi-market combined bidding strategy by utilizing the program, wherein the optimal multi-market combined bidding strategy comprises a bidding price curve shown in fig. 12 and bidding sales shown in fig. 13. The pumped storage charge and discharge of the energy hub under the bidding strategy are shown in fig. 14, and the charge and discharge of the thermal storage tank are shown in fig. 15 (wherein positive charge and negative charge are discharged).
The analysis result of the calculation example is as follows: the electricity price is low in 0-7, the photovoltaic heat collection system does not exert force, the wind power is low in output force, only electric energy is purchased, the electric energy is not sold, the heat price is proper in the period, the heat energy is sold, the electric energy generated by wind power and tidal energy is converted into heat energy through a boiler to be supplied, and redundant electric energy is stored through pumped storage after the heat supply is met; the electricity price is increased from 7, so that bidding power supply is started, but the wind power and tidal power generation output are not high at 7 and 8, and a part of electricity is required to be discharged by pumping energy storage; after 6, the photovoltaic heat collection system starts to output, but the heat productivity is low, and a part of electric energy is needed to be converted into electric energy through the boiler to supply heat; excessive output of the photovoltaic heating system is generated at 12 and 13 noon, and redundant heat energy is stored; the tidal power generation cannot be performed at 9-13 hours, but the wind power output is high, so that the power supply can be satisfied; the wind power and tidal power generation output is low in 14 and 15, and a part of energy is required to be discharged by pumped storage to generate power; the photovoltaic heating systems at 16 and 17 have low output and excessive tidal power generation output, and the surface sea water has high heat energy through solar heating for tens of hours, and the electric energy is utilized to pump water through a warm sea water pump to supply heat, and a large amount of heat energy is stored; 12-16 hours of cooling has a market, and redundant electric energy and heat energy are respectively converted into cold sales through a compression refrigerator and an absorption refrigerator; the total amount of wind power and tidal power generation is excessive at 18 and 19, the heat energy provided by the photovoltaic heating system is very small, and the heat price is very high at the moment, so that the redundant electric energy is converted into heat energy through a boiler to be sold; when the tidal power generation and photovoltaic heating system is stopped, pumping energy is needed to store energy, one part of the energy is supplied by electric energy, and the other part of the energy is converted into heat energy by a boiler to supply heat energy; when 21, 22 and 23 are carried out, the wind power output is small, the tidal power generation is not carried out, but the electricity price is high, and the supply amount of the electric energy is high, so that the heat storage tank is required to release the heat energy, one part is used for supplying heat, and the other part is converted into the electric energy for supply through an ocean temperature difference power generation (OTEC) system; at 24 hours, the electricity price is very low, the heat price is high, and a part of electric energy is purchased and the electric energy generated by the wind power generation capacity is converted into heat energy through a boiler to be sold.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part in the form of a software product stored in a computer readable storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above, comprising instructions for causing a terminal device to enter the method according to the embodiments of the present invention.
In the description of the present specification, the descriptions of the terms "one embodiment," "another embodiment," "other embodiments," or "first through X-th embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, method steps or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (1)
1. The combined regulation and control method for the hybrid ocean energy multipotency complementary energy hub is characterized by being applied to the hybrid ocean energy multipotency complementary energy hub, wherein the energy hub comprises an ocean energy multipotency coupling system, a tidal power generation system, an offshore wind power generation system, an offshore photovoltaic heat collection system, an ocean temperature difference power generation system and an energy storage system which are respectively connected with the ocean energy multipotency coupling system, and the ocean energy multipotency coupling system comprises an electric heating device, an electric refrigerating device and a thermal refrigerating device; the energy storage system comprises a heat storage device, a cold storage device and an electric storage device which are all connected with the ocean energy multifunctional coupling system, wherein the electric storage device comprises a water pump and a tidal energy reservoir which is connected with the water pump and used for pumping energy storage; the ocean temperature difference power generation system comprises a turbine, a condenser, a water feeding pump and an evaporator which are connected in a closed loop, wherein the evaporator is connected with a set warm seawater pump, the condenser is connected with a set cold seawater pump, and an output shaft of the turbine is connected with a set generator; the method comprises the following steps:
According to the energy flow rule of the energy hub and the energy hub, establishing an energy coupling matrix and an energy hub constraint condition which is met by the energy coupling matrix;
according to the energy coupling matrix, the energy hub constraint condition, the bidding strategy of the energy hub and the independent clearing flow of the electric market, the hot market and the cold market which are added by the energy hub and are not affected by each other, respectively establishing an electric market independent clearing model, a hot market independent clearing model and a cold market independent clearing model;
establishing a profit model of the energy hub according to the energy coupling matrix, the constraint condition of the energy hub, the independent electric market clearing model, the independent hot market clearing model and the independent cold market clearing model;
solving the profit model to obtain an optimal scheduling strategy of the energy hub, and regulating and controlling the energy hub according to the optimal scheduling strategy, wherein the method comprises the following steps: acquiring the supply quantity and bidding price respectively corresponding to the electric energy, the heat energy and the cold energy of the energy hub at the same time by utilizing an optimization method according to the profit model, and performing multi-market combined bidding; according to the supply quantity corresponding to the electric energy, the heat energy and the cold energy of the energy hub at the same time and the generation quantity of the electric energy, the heat energy and the cold energy of the energy hub, the energy storage in the energy hub is scheduled, and various energy conversion devices are utilized for coupling in a multi-energy form;
Wherein the energy coupling matrix is:
wherein: p (P) gp Representing the electric power output by the energy hub; p'. H Representing the thermal power output by the energy hub; p'. C Representing the cold power output by the energy hub; η (eta) B Indicating the efficiency of the electric boiler; η (eta) C Representing the efficiency of the compression refrigerator; η (eta) HP Indicating the working efficiency of the warm seawater suction pump; η (eta) CP Indicating the working efficiency of the cold seawater suction pump; η (eta) OF Representing the efficiency of the ocean temperature difference power generation system in converting the energy consumed by the feed pump into electric power; η (eta) HC Representing the operating efficiency of an absorption chiller; η (eta) OH Representing the efficiency of the ocean thermal power generation system to convert the input thermal power into electrical power; η (eta) OC Representing the efficiency of the ocean thermal power generation system to convert cold power to electrical power; w (W) WT Representing the power of the offshore wind power generation; q (Q) FPSC Representing the thermal power of a flat-panel solar collector; p (P) dp Representing the purchase of electrical power from the market; p (P) BESS Representing the difference of pumped storage discharge power minus charge power; p (P) HBES Representing the difference of the thermal storage tank discharge power minus the charge power; p (P) CBES Representing the difference of the cold storage tank discharge power minus the charge power; s is S B Representing the output thermal power of the electric boiler; s is S C Representing the cold power output by the compression refrigerator; p (P) HP Representing the useful power of the warm seawater suction pump; p (P) CP Representing the useful power of the cold seawater suction pump; s is S HC Indicating the output cold power of the absorption chiller; w (W) T Representing the electrical power emitted by the turbomachine;
the ocean temperature difference power generation system has the efficiency of converting input thermal power into electric power as follows:
efficiency of the ocean thermal power generation system to convert input thermal power into electrical power:
efficiency of the ocean temperature difference power generation system in converting energy consumed by the feed pump into electric power:
wherein P is OH Representing thermal power input to a marine thermoelectric power generation system；P OC Representing the cold power input into the ocean thermal power generation system; p (P) FP Representing the energy consumed by the feed pump; η (eta) FP Indicating the working efficiency of the feed pump;
the constraint conditions of the energy hub are as follows:
0≤P gp,t ≤P gp,max ；
wherein: wherein P is gp,max Indicating the maximum electric power, P, desired to be provided by the energy hub gp,t Representing the electrical power provided by the energy hub;
the electric market objective function of the electric market independent clearing model with the electric market meeting the load and the lowest cost is as follows:
wherein:
generating electricity for suppliers in the electricity market, m i 、n i Coefficients that are quadratic functions of the power generation cost and the power generation power; δP gp For the cost of purchasing electrical energy from the energy hub, delta is the price of agreed electricity, < >>
Representing the active power injected into node i, P gp To purchase electrical energy; χP (χ) dp To sell electric energy income to energy resource hub, χ is selling price of electric energy, P dp To sell electrical energy;
the matrix form of the electric market objective function of the electric market independent clearing model with the electric market meeting the load and the lowest cost is as follows:
the electrical market constraints are:
A p p+B p x＝b p ；
C p p+D p x≤d p (P gp,max ,P dp,max )；
wherein: wherein p is formed by
P gp And P dp A matrix of formations; a is that p 、B p 、b p 、C p 、D p And d p For a constant coefficient matrix, x is the residual variable, Q p Is a coefficient matrix with quadratic function written in matrix form>
Is also a coefficient matrix;
the matrix form of the thermal market objective function of the thermal market independent clearing model is as follows:
the thermal market constraints are:
wherein P is H The heat supply system is a matrix formed by injecting heat power and selling heat energy into a heat supply network node, wherein gamma is the protocol heat supply unit price;
the vector is the mass flow of water in the heat supply pipe; a is that H 、b H 、C H And d H As a constant coefficient matrix, B H And D H Is composed of->
Determined constant coefficient matrix, κ H To be provided withVectors of all temperature variables in the thermal system;
the matrix form of the cold energy market objective function of the cold market independent clearing model is as follows:
the cold energy market constraint conditions are as follows:
wherein: p (P) C The system is a matrix formed by injecting cold power and selling cold energy by the cold supply network nodes, and epsilon is the protocol cold supply unit price; 
The vector is the mass flow of water in the cold supply pipe; a is that C 、b C 、C C And d C As a constant coefficient matrix, B C And D C Is composed of->
Determined constant coefficient matrix, κ C Is a vector containing all temperature variables in the cooling system;
the profit objective function of the profit model is:
max(δ) T P gp +(γ) T P' H +(ε) T P' C -(χ) T P dp ；
wherein: (delta) T P gp Cost of selling electric energy for energy hub (gamma) T P' H Cost of selling thermal energy for energy hub (ε) T P' C Cost of selling cold energy for energy hub, (χ) T P dp And purchasing electrical energy income for the energy hub.
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