CN110970892B - Energy balance-based provincial energy Internet multi-energy flow regulation and optimization method - Google Patents
Energy balance-based provincial energy Internet multi-energy flow regulation and optimization method Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H—ELECTRICITY
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The invention belongs to the technical field of electric energy, and particularly relates to a provincial energy Internet multi-energy flow regulation and optimization method based on energy balance. The invention comprises the following steps: collecting data and information of various energy resources in the ground city; establishing a public bus model of energy balance of a ground city by utilizing the acquired information; establishing a provincial energy balance public bus model by utilizing the acquired information; constructing a provincial energy internet multi-energy flow regulation optimization model under a single period; establishing a typical market-level electrothermal interconnection energy system model; and outputting provincial energy Internet multi-energy flow regulation and control optimization result information. The effectiveness and rationality of the invention for regulating and optimizing the multi-energy flow of the provincial energy Internet are verified through simulation examples, and reference and theoretical guidance are provided for the multi-energy complementary utilization, resource coordination and cooperation, economic and efficient operation and analysis of the provincial energy Internet.
Description
Technical Field
The invention belongs to the technical field of electric energy, and particularly relates to a provincial energy Internet multi-energy flow regulation and optimization method based on energy balance.
Background
The current world is about to run out of traditional fossil energy, while emerging energy cannot replace the embarrassment of traditional energy, so that the energy use mode needs to be improved nowadays in order to realize smooth transition between new and old energy. The energy internet generally refers to a technical solution for optimally configuring various energy resources according to an energy structure and energy endowment in a certain area, and simultaneously combining advanced technologies such as waste heat utilization, heat pump, energy storage and the like, fully utilizing high-grade and low-grade energy sources and providing products such as cold, heat, electricity and the like for users in the area. The area herein may be generally referred to as an administrative division in a country or city, such as a country, town, village, street, etc., or may be divided according to a uniform characterization of a particular industry and form over a geographic area, such as an industrial park, commercial park, agricultural park, residential park, etc. The construction of the energy Internet is quickened, and the method is a necessary way for promoting clean transformation of energy.
Disclosure of Invention
Aiming at the problem of energy balance-based energy-saving Internet multi-energy flow regulation and optimization, the invention aims to provide an energy balance-based energy Internet multi-energy flow regulation and optimization method for promoting multi-energy complementary utilization, realizing economic and efficient operation of an energy-saving system, enhancing resource coordination capacity and improving multi-energy flow economic dispatch and regulation and optimization potential.
In order to achieve the above object, the present invention is achieved by the following technical scheme:
the invention discloses an energy balance-based provincial energy Internet multi-energy flow regulation and optimization method, which comprises the following steps of:
the method comprises the following steps of (1) collecting data and information of various energy resources in the ground city;
step (2) utilizing the collected information to establish a public bus model of energy balance of the ground city;
step (3) utilizing the collected information to establish a provincial energy balance public bus model;
step (4) constructing a provincial energy internet multi-energy flow regulation optimization model under a single period;
step (5) establishing a typical market-level electrothermal interconnection energy system model;
and (6) outputting provincial energy Internet multi-energy flow regulation and control optimization result information.
The collection of various energy resource data and information of the ground city comprises the following steps: the power generation energy resource, the heat supply energy resource, the electric load and the heat load and the power exchange information of the public electricity bus of the ground city and the provincial level.
The establishing of the public bus type model for energy balance of the ground city comprises the following steps: a ground-level city bus-type electric energy balance model and a ground-level city bus-type heat energy balance model.
The expression of the ground city bus type electric energy balance model is as follows:
wherein:the power load of the ith ground level city; />The electric quantity of the power consumption bus is consumed for the energy coupling equipment ed_e of the ith ground level city; />The power supply amount of the power generation unit type_e of the ith ground city to the electric bus; />The power exchange quantity of the power bus of the ith ground level city and the provincial public power bus is obtained; ed_e includes electric boilers, heat pumps; type_e comprises hydroelectric power, thermal power, nuclear power, wind power, photovoltaic power, coal-fired thermoelectric power generation and gas thermoelectric power generation;
the expression of the ground city bus type heat energy balance model is as follows:
wherein:for the ith ground cityA thermal load; />The heat supply quantity of the direct heat supply heat source unit type_h of the ith ground city to the heat bus is provided; />The energy coupling device ed_e of the ith ground city supplies heat energy to the thermal bus; type_h includes coal-fired thermoelectric heat supply, coal-fired boiler heat supply, gas-fired thermoelectric heat supply, gas-fired boiler heat supply, geothermal heat supply, biomass heat supply, distributed gas heat supply, solar heat supply, industrial waste heat supply, and bulk coal heat supply.
The provincial energy balance public bus model is built, and the provincial energy balance public bus model is specifically as follows:
wherein: e (E) hydro The equivalent generating capacity of the water and electricity with small capacity; e (E) tu The equivalent power generation amount is the thermal power with small capacity; e (E) wt Equivalent power generation amount of the small-capacity fan; e (E) pv The photovoltaic equivalent generating capacity is low;is the amount of power exchange between provincial levels.
The objective of the optimization model is to minimize the amount of power exchange between provincial levels.
The provincial energy internet multi-energy flow regulation optimization model under a single period of time is specifically as follows:
wherein:the objective function is optimized for the multi-energy flow regulation of the provincial energy Internet under a single period.
The energy system model includes: a thermodynamic system model, an electric power system model, a coupling equipment model, a multi-period-based city-level electric heating interconnection system regulation and control optimization model and a constraint condition model.
The thermodynamic system model comprises a thermodynamic model and a hydraulic model, and the thermodynamic model expression is as follows:
wherein: t is the time period;supplying heat power to the heat source and requiring heat power by the heat load respectively; kappa, m i Hot water specific heat capacity and node mass flow rate respectively; />The temperature of the hot water is respectively the temperature of the hot water for supplying and the temperature of the hot water for returning;the outflow flow, the outflow hot water temperature, the inflow flow and the inflow hot water temperature of the converging nodes are respectively; />The temperature of the tail end of the pipeline, the temperature of the head end of the pipeline and the temperature of the environment where the pipeline is positioned are respectively; delta p 、L p 、m p The heat transfer coefficient of the pipeline, the length of the thermodynamic pipeline and the mass flow of the pipeline are respectively;
the hydraulic model expression is as follows:
wherein:the pressure head loss, the on-way resistance loss and the local resistance loss of the ith pipeline are respectively; />ρ i v i Respectively isLength, diameter and working medium density of the ith pipeline; v i An average flow rate for the ith pipe; lambda (lambda) i 、ξ i The friction resistance coefficient and the local resistance coefficient of the ith pipeline are respectively;
the power system model has the following expression:
wherein: p (P) i Injecting power for the power system node; b (B) ij 、x ij 、P ij Branch susceptance, branch reactance and branch transmission power of the power system are respectively; θ i 、θ j 、Δθ ij The phase difference value is respectively the phase angle of the head end node of the branch, the phase angle of the tail end node of the branch and the phase angle difference value of the head end and the tail end of the branch of the power system;
the expression of the coupling equipment model is as follows:
H chp (t)＝γ h2e ·P chp (t)
wherein: h chp The thermal power generated for the thermoelectric unit; p (P) chp Electric power generated for the thermoelectric unit; gamma ray h2e The thermoelectric ratio is the thermoelectric unit;
the regulation and control optimization model of the multi-period underground municipal electric heating interconnection energy system has the following expression:
wherein:the method comprises the steps of optimizing an objective function for regulating and controlling a multi-period underground electric heating interconnection energy system; NT is the optimal run length; CNY (carbon nanotubes) tu 、CNY chp The operation cost of the thermal power unit and the thermoelectric unit is respectively; omega shape tu 、Ω chp The number of the thermoelectric units is equal to the number of the thermal power units; a, a i 、b i 、c i The operation cost characteristic function coefficient of the ith thermal power generating unit is set; />The electric output of the ith thermal power unit; a is that CHP 、B CHP 、C CHP 、D CHP 、E CHP Operating cost characteristic function coefficients for the ith thermoelectric unit;
the constraint condition model comprises: the system comprises a multi-period underground city electric heating interconnection energy system unit capacity constraint condition, a multi-period underground city electric heating interconnection energy system unit climbing constraint condition, a multi-period underground city electric heating interconnection energy system thermodynamic system operation constraint condition and a multi-period underground city electric heating interconnection energy system electric power system operation constraint condition;
the capacity constraint condition expression of the multi-period underground city grade electric heating interconnection energy system unit is as follows:
wherein: P chp the upper limit and the lower limit of the power generation capacity of the thermoelectric unit are respectively; /> H chp The upper limit and the lower limit of the heat generating capacity of the thermoelectric unit are respectively adopted; /> P i tu The upper limit and the lower limit of the power generation capacity of the thermal power generating unit are respectively adopted;
the climbing constraint condition expression of the multi-period underground city grade electric heating interconnection energy system unit is as follows:
wherein:ΔP chp the upward and downward climbing limit of the power generation of the thermoelectric unit is respectively carried out; />ΔH chp The upward and downward climbing limit of the heat generation of the thermoelectric unit is respectively carried out; />ΔP i tu The upward and downward climbing limit of the power generation of the thermal power generating unit is respectively realized;
the operation constraint condition expression of the thermodynamic system of the multi-period underground municipal electric heating interconnection energy system is as follows:
wherein:T i g 、respectively restricting the lower limit and the upper limit of the temperature of hot water supplied to the nodes;T i r 、/>respectively restricting the lower limit and the upper limit of the temperature of the node backwater hot water;m p 、/>respectively restricting the lower limit and the upper limit of the mass flow of the heating power pipeline;
the operation constraint condition expression of the electric power system of the multi-period underground city electric heating interconnection energy system is as follows:
wherein:P ij 、respectively restricting the lower limit and the upper limit of the branch capacity of the power system;θ i 、/>and the lower limit and the upper limit of the phase angle of the power system node are respectively restricted.
The optimization result information comprises: the power flow of the electric heat energy system, the operation output of the coupling equipment, the economic operation cost of various energy equipment, the power exchange quantity and the balance information of the electric heat energy bus.
By adopting the technical scheme, the invention has the following advantages:
the energy internet is characterized by electricity as a center, a network as a platform, intelligent interconnection, clean replacement and electric energy replacement. Compared with the traditional power grid, the energy Internet is a configuration platform for promoting the large-scale development and utilization of clean energy, is an innovative platform for supporting the continuous emergence of new technologies, new amateurs and new modes, and is a market trading platform for realizing friendly interaction of different main bodies and meeting the requirement of diversified energy consumption of users. The energy Internet is based on the Internet, the energy and information in the energy Internet are fused to a high degree by utilizing the theory and technical means related to the Internet, the problems of uncertainty, strong coupling and the like of the energy network are solved by utilizing the high efficiency and the rapidity of the information network, so that the multi-energy complementation is realized, the peak clipping and valley filling of loads are realized, the voltage utilization force of the traditional pure electric network is relieved, the energy structure is optimized and improved, the grading and layered utilization of the energy are realized, the new energy consumption rate is increased, and the environmental pollution caused by energy utilization is reduced.
The invention comprehensively considers the energy balance relation between the district and the city from the angles of single time period and multiple time periods so as to realize the aim of regulating and optimizing the multi-energy flow. The multi-energy complementary utilization of province level and city level can be promoted, and the multi-energy flow economic dispatching and regulation optimization potential can be improved; the capability of utilizing resources in a diversified way and the capability of coordinating and matching the resources are improved; the economic and efficient operation of the provincial energy system is realized, and the flexibility of the operation cooperative regulation and control of the electrothermal interconnection energy system is enhanced. The model and the method can provide reference and theoretical guidance for economic dispatch, multi-energy flow regulation and control optimization, resource flexibility configuration, operation analysis of the interconnected energy system and the like of the provincial energy Internet and the electric heating interconnected energy system.
Drawings
In order to facilitate the understanding and practice of the invention, those of ordinary skill in the art will now make further details with reference to the drawings and detailed description, it being understood that the scope of the invention is not limited to the specific description.
FIG. 1 is a flow chart of an embodiment of the present invention;
FIG. 2 is a block diagram of a ground level utility energy balance common electric heat energy balance bus;
FIG. 3 is a diagram of a provincial power bus energy balance architecture;
FIG. 4 is a graph of the power balance results for each grade;
FIG. 5 is a graph of heat energy balance results for each grade market;
FIG. 6 is a diagram of an example of a multi-period underground utility grade electric heating interconnected energy system;
FIG. 7 is a graph of maximum predicted output data for a wind turbine and a photovoltaic turbine;
FIG. 8 is a graph of node pressure variation for an 8-node thermodynamic system DHS 8;
FIG. 9 is a graph of the results of the optimization of the electrical output of each node of the IEEE39 modified 39 node power system;
fig. 10 is a graph of time-period-by-time variation of the operating cost of the electric heating interconnected energy system at the ground level under multiple time periods.
Detailed Description
The technical solutions in the examples of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. Based on the embodiments of the present invention, other embodiments that may be obtained by those of ordinary skill in the art without making any inventive effort are within the scope of the present invention.
Specifically, the energy balance-based provincial energy internet multi-energy flow regulation and control optimization method, as shown in fig. 1, comprises the following steps:
(1) And collecting data and information of various energy resources in the ground city.
And collecting various energy resource data and information of the ground city, including power generation energy resource, heat supply energy resource, electric load, heat load, and information of power exchange of the ground city and the provincial public power bus.
(2) And establishing a public bus type model of energy balance in the ground city.
A. A bus type electric energy balance model in the ground level market.
The electric energy balance of the ground city is that the input electric power and the output electric power are balanced in real time, the input comprises the injection amount of various power supplies to the electric bus and the power exchange amount of the ground city and the provincial electric bus, and the output comprises the electric load and the power consumption of various electric energy coupling equipment. The ground city bus type electric energy balance model has the following formula:
wherein:the power load of the ith ground level city; />The electric quantity of the power consumption bus is consumed for the energy coupling equipment ed_e of the ith ground level city; />The power supply amount of the power generation unit type_e of the ith ground city to the electric bus; />The power exchange quantity of the power bus of the ith ground level city and the provincial public power bus is obtained; ed_e includes electric boilers, heat pumps; type_e comprises hydroelectric, thermal, nuclear, wind power, photovoltaic, coal-fired thermoelectric power generation and gas thermoelectric power generation.
B. A bus type heat energy balance model in the ground level market.
The heat energy balance of the ground city is that the input heat power and the output heat power are balanced in real time, the input is mainly the injection quantity of various heat sources to the heat bus, and the output is mainly the heat load. The ground city bus type heat energy balance model has the following formula:
wherein:is the heat load of the ith district market; />The heat supply quantity of the direct heat supply heat source unit type_h of the ith ground city to the heat bus is provided; />The energy coupling device ed_e of the ith ground city supplies heat energy to the thermal bus; type_h includes coal-fired thermoelectric heat supply, coal-fired boiler heat supply, gas-fired thermoelectric heat supply, gas-fired boiler heat supply, geothermal heat supply, biomass heat supply, distributed gas heat supply, solar heat supply, industrial waste heat supply, and bulk coal heat supply.
(3) And establishing a provincial energy balance public bus model.
The provincial energy balance common bus is an electric power balance energy bus, is injected into the equivalent power generation capacity of the small-capacity unit, and outputs the power exchange capacity of the provincial energy balance electric bus between each local city and the provincial energy balance electric bus, and other provincial energy balance common bus between other provincials and the provincial energy balance electric bus. The provincial energy balance common bus model has the following formula:
wherein: e (E) hydro The equivalent generating capacity of the water and electricity with small capacity; e (E) tu The equivalent power generation amount is the thermal power with small capacity; e (E) wt Equivalent power generation amount of the small-capacity fan; e (E) pv The photovoltaic equivalent generating capacity is low;is the amount of power exchange between provincial levels.
(4) And constructing a provincial energy internet multi-energy flow regulation optimization model under a single period.
The provincial energy Internet multi-energy flow regulation and control optimization target under a single period is that the provincial power exchange amount of the provincial and other provincials is the smallest, and the multi-energy flow regulation and control optimization model is as follows:
wherein:the objective function is optimized for the multi-energy flow regulation of the provincial energy Internet under a single period.
(5) And establishing a typical market-grade electric heating interconnection energy system model.
The energy system model includes: a thermodynamic system model, an electric power system model, a coupling equipment model, a multi-period-based city-level electric heating interconnection system regulation and control optimization model and a constraint condition model.
A. And (5) a thermodynamic system model.
The thermodynamic system generally consists of a heat source, a heat supply network and a heat load, the water supply network and the water return network in the thermodynamic system have the same topology, and water flow forms a cycle in the water supply network and the water return network, so that analysis can be carried out on a water supply network model. The pressure circulation pump consumes electric energy to generate and maintain pressure difference so as to maintain hydraulic balance, the electric energy consumed by the pressure circulation pump is related to flow and pressure difference, and the electric energy consumed by the pressure circulation pump is very small relative to the whole thermodynamic system, so the pressure circulation pump is omitted in the invention.
The thermodynamic system model comprises a thermodynamic model and a hydraulic model, wherein the thermodynamic system model is represented by the following formula:
wherein: t is the time period;supplying heat power to the heat source and requiring heat power by the heat load respectively; kappa, m i Hot water specific heat capacity and node mass flow rate respectively; />The temperature of the hot water is respectively the temperature of the hot water for supplying and the temperature of the hot water for returning;the outflow flow, the outflow hot water temperature, the inflow flow and the inflow hot water temperature of the converging nodes are respectively; />The temperature of the tail end of the pipeline, the temperature of the head end of the pipeline and the temperature of the environment where the pipeline is positioned are respectively; delta p 、L p 、m p The heat transfer coefficient of the pipeline, the length of the thermodynamic pipeline and the mass flow of the pipeline are respectively.
For any hot water pipeline numbered i in the thermodynamic system, the head loss comprises two parts of along-way resistance loss and local resistance loss.
The hydraulic model expression is as follows:
wherein:the pressure head loss, the on-way resistance loss and the local resistance loss of the ith pipeline are respectively; />ρ i v i The length, the diameter and the working medium density of the ith pipeline are respectively; v i An average flow rate for the ith pipe; lambda (lambda) i 、ξ i The friction resistance coefficient and the local resistance coefficient of the ith pipeline are respectively set.
B. And (5) a power system model.
For brevity, the power system model adopts a direct current power flow model, and the model is as follows:
wherein: p (P) i Injecting power for the power system node; b (B) ij 、x ij 、P ij Branch susceptance, branch reactance and branch transmission power of the power system are respectively; θ i 、θ j 、Δθ ij The phase angles are respectively the phase angle of the head end node, the phase angle of the tail end node and the phase angle difference value of the head end and the tail end of the branch of the power system.
C. And (5) coupling the device model.
The electrothermal interconnection energy system is mainly coupled together through the thermoelectric unit, and the thermoelectric unit usually works in a thermoelectric mode, so that the thermoelectric unit has small thermoelectric ratio change. The thermoelectric unit coupling device model is as follows:
H chp (t)＝γ h2e ·P chp (t)
wherein: h chp The thermal power generated for the thermoelectric unit; p (P) chp Electric power generated for the thermoelectric unit; gamma ray h2e Is the thermoelectric ratio of the thermoelectric unit.
D. And (3) regulating and optimizing the model of the ground city electric heating interconnection energy system under a plurality of time periods.
The regulation and optimization objective of the ground-city-level electric heating interconnection energy system under the multiple time periods is to minimize the running cost of the thermal power unit and the thermoelectric unit. The operation cost characteristic function of the thermal power unit can be expressed by a quadratic function, the operation cost characteristic function of the thermoelectric unit is a quadratic function related to the thermal output and the electric output at the same time, and the regulation and control optimization model has the following formula:
wherein:the method comprises the steps of optimizing an objective function for regulating and controlling a multi-period underground electric heating interconnection energy system; NT is the optimal run length; CNY (carbon nanotubes) tu 、CNY chp The operation cost of the thermal power unit and the thermoelectric unit is respectively; omega shape tu 、Ω chp The number of the thermoelectric units is equal to the number of the thermal power units; a, a i 、b i 、c i The operation cost characteristic function coefficient of the ith thermal power generating unit is set; />The electric output of the ith thermal power unit; a is that CHP 、B CHP 、C CHP 、D CHP 、E CHP And the operating cost characteristic function coefficient of the ith thermoelectric unit.
E. Constraint condition model.
The regulation and optimization operation constraint condition model of the ground city grade electric heating interconnection energy system under the multi-period mainly comprises the following steps: the system comprises a multi-period underground city electric heating interconnection energy system unit capacity constraint condition, a multi-period underground city electric heating interconnection energy system unit climbing constraint condition, a multi-period underground city electric heating interconnection energy system thermodynamic system operation constraint condition and a multi-period underground city electric heating interconnection energy system electric power system operation constraint condition;
the capacity constraint condition expression of the multi-period underground city grade electric heating interconnection energy system unit is as follows:
wherein: P chp the upper limit and the lower limit of the power generation capacity of the thermoelectric unit are respectively; /> H chp The upper limit and the lower limit of the heat generating capacity of the thermoelectric unit are respectively adopted; /> P i tu And the upper limit and the lower limit of the power generation capacity of the thermal power generating unit are respectively realized.
The climbing constraint condition expression of the multi-period underground city grade electric heating interconnection energy system unit is as follows:
wherein:ΔP chp the upward and downward climbing limit of the power generation of the thermoelectric unit is respectively carried out; />ΔH chp The upward and downward climbing limit of the heat generation of the thermoelectric unit is respectively carried out; />ΔP i tu And the upward and downward climbing limit of the power generation of the thermal power generating unit is respectively realized.
The operation constraint conditions of the thermodynamic system of the multi-period underground municipal electric heating interconnection energy system are as follows:
wherein:T i g 、respectively restricting the lower limit and the upper limit of the temperature of hot water supplied to the nodes;T i r 、/>respectively about the lower limit and the upper limit of the temperature of the node backwater hot waterA bundle;m p 、/>the lower limit and the upper limit of the mass flow of the heating power pipeline are respectively restrained.
The operation constraint conditions of the electric power system of the ground-city electric heating interconnection energy system under the multi-period are as follows:
wherein:P ij 、respectively restricting the lower limit and the upper limit of the branch capacity of the power system;θ i 、/>and the lower limit and the upper limit of the phase angle of the power system node are respectively restricted.
(6) And outputting provincial energy Internet multi-energy flow regulation and control optimization result information.
Outputting provincial energy Internet multi-energy flow regulation and control optimization result information, wherein the optimization result information comprises: the flow of the electric heat energy system, the operation output of the coupling equipment, the economic operation cost of various energy equipment, the power exchange quantity and the balance information of the electric heat energy bus.
Example 1
The embodiment of the invention takes Liaoning province as a research object, utilizes the related data in 2017, and considers 14 ground-level markets in common jurisdiction of Liaoning province, namely dandong market, mallotus market, chaoyang market, calabash island market, shenyang market, dalian market, brocade market, iron-green market, benxi market, yingkou market, fuxin market, liaoyang market, danshan market and Fushun market. And (3) performing early data input, processing and interface construction on the MATLAB2018a platform, writing a model program based on a universal business optimization software LINGO18.0 platform, and calling a Global Solver (Global Solver) to solve.
The energy balance-based provincial energy Internet multi-energy flow regulation and control optimization topological structure in a single period is shown in fig. 2 and 3. FIG. 2 is a diagram showing an electric heat balance relationship of any one of the city levels based on energy balance in a single period, wherein the solid thick line in FIG. 2 is an electric energy bus and the solid thin line is an electric energy flow; the dashed thick lines in fig. 2 are thermal buses and the dashed thin lines are thermal flows. The hydroelectric, thermal power, nuclear power, wind power, photovoltaic, heat medium thermoelectric power generation and gas thermoelectric power generation unit inject electric energy into the electric energy bus, and meanwhile, the power exchange, the heat pump, the electric boiler and the electric load consume the electric energy of the electric energy bus; coal-fired thermoelectric heating, coal-fired boiler, gas-fired thermoelectric heating, gas-fired boiler, electric boiler heating, heat pump heating, geothermal heating, biomass heating, distributed natural gas heating, solar heating, industrial waste heat heating, and heat dissipation coal heating inject thermal power into the thermal energy bus, and the thermal load consumes the thermal power of the thermal energy bus. Each local city is in electric power exchange with the provincial public bus, and the heat energy of each local city is supplied and consumed by the local city, and the heat energy of the local city is not in heat power exchange with other local cities. Fig. 3 is a relationship of overall power balance of the Liaoning province based on energy balance in a single period, wherein hydropower is full-province low-capacity hydropower equivalent power generation, thermoelectricity is full-province low-capacity thermoelectricity equivalent power generation, wind power is full-province low-capacity fan equivalent power generation, photovoltaic is full-province low-capacity photovoltaic equivalent power generation, provincial power exchange is power exchange between provincial levels, and other power exchanges are between 14 grade city and provincial public power buses.
The electric energy balance result is shown in fig. 4, and it can be clearly known from fig. 4 that the electric energy bus balance effect of each district and city and the contribution condition of various resources are different in the resource endowment of different district and city, and the energy supply characteristics are also different. From fig. 4, it is found that the thermal power ratio of Dalian city and Tiaoling city is relatively large, and the Dalian city has obvious nuclear power advantage, and according to different supply and demand relations, the resource layout can be flexibly adjusted, and the electric energy of each district city can reach reasonable supply and demand balance. Fig. 5 shows the heat energy balance result of each district and city, and it is apparent from fig. 5 that the heat source of each district and city mainly originates from the thermoelectric unit for heating and electric heating, and the heat energy supply ratio of other resources or units is small and can be ignored. The result of fig. 5 shows that the heat supply of each district market mainly comprises a thermoelectric unit and an electric boiler, other forms of heat supply are auxiliary heat supplies, and the heat supply architecture of Liaoning province has a certain adjustment space.
With the city of the land of Liaoning province and the city of the barrage as the background, the topology structure of the regulation and optimization example of the electric heating interconnection energy system of the city of the land under the multi-time period is shown in figure 6. The city-level electrothermal interconnection energy system in the example of fig. 6 mainly comprises a modified IEEE39 node electric power system (abbreviated as IEEE 39), an 8 node thermodynamic system (abbreviated as DHS 8), a 9 node thermodynamic system (abbreviated as DHS 9), and electrothermal energy system thermoelectric coupling unit units (abbreviated as chp#1 and chp#2). In the invention, the multi-period underground city electric heating interconnection energy system regulation and control optimization calculation simulation takes typical winter days in 2017 of Yingkou city of Liaoning province as a research object, the time interval is 1h (namely, the optimization simulation step length), and one optimization simulation period is divided into 24 periods. The IEEE39 node power system parameters are mainly derived from Matpower5.1, wherein node 33 introduces a photovoltaic unit; node 36 introduces a wind power unit; node 39 is connected to a common provincial power balance bus, namely a power exchange point (abbreviated as PCC) between the provincial and city barrages; node 30, node 31, node 32, node 34, node 37, node 39 are conventional thermal power units (abbreviated as TUs); node 38 is connected to node 1 of DHS8 by thermoelectric unit chp#1; node 35 is connected to node 1 of DHS9 via thermoelectric unit chp#2. Node 1 of DHS8 and DHS9 are heat source points, wherein 1, 2, and 3 … represent node numbers, (1), (2), and (3) … represent pipe numbers, and CP represents a pressure circulation pump. Specific information of the thermal power unit (TU), the thermoelectric unit (CHP), the wind power unit (WT) and the photovoltaic unit (PV) can be seen from the legend of FIG. 6. The main parameter settings of a Wind Turbine (WT) and a Photovoltaic (PV) of the multi-period underground city electric heating interconnection energy system regulation and optimization calculation example are shown in figure 7.
The main results and analysis of the regulation and optimization calculation example of the multi-period underground city electric heating interconnection energy system are as follows: the pressure result of the DHS8 in the electrothermal interconnection energy system is shown in fig. 8, and the node 1 in the DHS8 is used as a heat source and is set as a pressure reference point, and the pressure reference point is 0.8MPa. It can be found from fig. 8 that, on the pipeline trunk of the thermodynamic system, the pressure of the node 1, the node 6, the node 7 and the node 8 and the pressure of the node 5 are sequentially reduced, and the pressure drop can effectively meet the setting requirement of the pressure fluctuation of the node due to the pressure circulating pump arranged on the trunk device. The pressure drop of the branch nodes 2, 3, 4 is not only related to the distance from the heat source, but also to the magnitude of the node thermal load. As can be seen from fig. 8, the daytime is the low-valley period of the heat load demand, the flow demand is relatively low at night, and the pressure loss is small, so that the pressure of each node is relatively high at daytime, and the situation at night is opposite, so that the thermodynamic system model is effective according to the practical engineering application characteristics. The result of optimizing the electric output of each node unit of the electric power system is shown in fig. 9, and the electric power supply condition of each node can be clearly known from fig. 9. The coordinated output of the nodes 30-39 of the IEEE39 power system after modification is related to the capacity of the power system, the running cost characteristics of the units, the positions of the units, the safe running constraint conditions and the electric load curve characteristics, and the electric output of each unit is reasonably coordinated and controlled, so that the overall running cost of the system can be effectively reduced. Fig. 9 shows that in the optimization period, the electric energy supply and demand reach equilibrium in real time, and the output of each unit is near the rated capacity, so that the operation efficiency is high. The operation cost of the regulation and optimization of the ground-city electric heating interconnection energy system under multiple periods changes from period to period as shown in fig. 10, and the operation cost is higher in the electric load peak period and relatively lower in the electric load valley period as a whole. According to fig. 10, the overall cost change trend of the electrothermal interconnection energy system in the regulation and control optimization process can be known in time, so that the production and supply relation of the energy system can be improved and perfected in time.
While the invention has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (10)
1. Energy balance-based provincial energy Internet multi-energy flow regulation and optimization methodThe method is characterized in that: comprising the following steps: step 1, collecting data and information of various energy resources in the ground city; step 2, establishing a public bus model of energy balance of the ground city by utilizing the acquired information; step 3, establishing a provincial energy balance public bus model by utilizing the acquired information; step 4, constructing a provincial energy internet multi-energy flow regulation optimization model under a single period, wherein the expression is as follows:wherein: />Optimizing objective function for provincial energy Internet multi-energy flow regulation under single period of time, < >>Is the amount of power exchange between provincial levels; step 5, establishing a typical market-level electrothermal interconnection energy system model; wherein, the regulation and control optimization model of the electric heating interconnection energy system of the ground level under the multi-time period has the expression:
wherein:the method comprises the steps of optimizing an objective function for regulating and controlling a multi-period underground electric heating interconnection energy system; NT is the optimal run length; CNY (carbon nanotubes) tu 、CNY chp The operation cost of the thermal power unit and the thermoelectric unit is respectively; omega shape tu 、Ω chp The number of the thermoelectric units is equal to the number of the thermal power units; a, a y 、b y 、c y Operating cost characteristic function system for the y-th thermal power generating unitA number; />The electric output of the y thermal power generating unit is the electric output of the y thermal power generating unit; />The operating cost characteristic function coefficient of the r thermoelectric unit is set;the thermal power generated for the thermoelectric unit; />Electric power generated for the thermoelectric unit; and step 6, outputting provincial energy Internet multi-energy flow regulation and control optimization result information.
2. The energy balance-based provincial energy internet multi-energy flow regulation and optimization method according to claim 1, wherein the method is characterized by comprising the following steps of: the collection of various energy resource data and information of the ground city comprises the following steps: the power generation energy resource, the heat supply energy resource, the electric load and the heat load and the power exchange information of the public electricity bus of the ground city and the provincial level.
3. The energy balance-based provincial energy internet multi-energy flow regulation and optimization method according to claim 1, wherein the method is characterized by comprising the following steps of: the establishing of the public bus type model for energy balance of the ground city comprises the following steps: a ground-level city bus-type electric energy balance model and a ground-level city bus-type heat energy balance model.
4. The energy balance-based provincial energy internet multi-energy flow regulation and control optimization method according to claim 3, wherein the method is characterized by comprising the following steps of: the expression of the ground city bus type electric energy balance model is as follows:
wherein:the power load of the gg-th ground level city; />The electric quantity of the power consumption bus is consumed for the energy coupling equipment ed_e of the gg ground level city; />The power supply amount of the power generation unit type_e in the gg-th ground city to the electric bus; />The power exchange quantity of the power bus of the gg ground level city and the provincial public power bus; ed_e includes electric boilers, heat pumps; type_e comprises hydroelectric power, thermal power, nuclear power, wind power, photovoltaic power, coal-fired thermoelectric power generation and gas thermoelectric power generation;
the expression of the ground city bus type heat energy balance model is as follows:
wherein:is the heat load of the gg-th ground market; />The heat supply quantity of the direct heat supply heat source unit type_h of the gg-th ground city to the heat bus is provided; />The thermal energy supplied to the thermal bus by the energy coupling device ed_e of the gg-th ground city; type_h comprises coal-fired thermoelectric heating and coal-firedBoiler heating, gas thermoelectric heating, gas boiler heating, geothermal heating, biomass heating, distributed gas heating, solar heating, industrial waste heat heating and coal-fired heating.
5. The energy balance-based provincial energy internet multi-energy flow regulation and optimization method according to claim 1, wherein the method is characterized by comprising the following steps of: the provincial energy balance public bus model is built, and the provincial energy balance public bus model is specifically as follows:
wherein: e (E) hydro The equivalent generating capacity of the water and electricity with small capacity; e (E) tu The equivalent power generation amount is the thermal power with small capacity; e (E) wt Equivalent power generation amount of the small-capacity fan; e (E) pv The photovoltaic equivalent generating capacity is low;for the amount of power exchange between provincial levels, +.>The power exchange quantity of the power bus of the gg ground level city and the provincial public power bus is obtained.
6. The energy balance-based provincial energy internet multi-energy flow regulation and optimization method according to claim 1, wherein the method is characterized by comprising the following steps of: the objective of the optimization model is to minimize the amount of power exchange between provincial levels.
7. The energy balance-based provincial energy internet multi-energy flow regulation and optimization method according to claim 1, wherein the method is characterized by comprising the following steps of: the energy system model includes: a thermodynamic system model, an electric power system model, a coupling equipment model, a multi-period-based city-level electric heating interconnection system regulation and control optimization model and a constraint condition model.
8. The energy balance-based provincial energy internet multi-energy flow regulation and control optimization method of claim 7, wherein the method is characterized by comprising the following steps of: the thermodynamic system model comprises a thermodynamic model and a hydraulic model, and the thermodynamic model expression is as follows:
wherein: t is the time period;supplying heat power to the heat source and requiring heat power by the heat load respectively; kappa, m i Hot water specific heat capacity and node mass flow rate respectively; t (T) i g 、T i r The temperature of the hot water is respectively the temperature of the hot water for supplying and the temperature of the hot water for returning; />T i out 、/>T i in The outflow flow, the outflow hot water temperature, the inflow flow and the inflow hot water temperature of the converging nodes are respectively; />The temperature of the tail end of the pipeline, the temperature of the head end of the pipeline and the temperature of the environment where the pipeline is positioned are respectively; delta p 、L p 、m p The heat transfer coefficient of the pipeline, the length of the thermodynamic pipeline and the mass flow of the pipeline are respectively;
the hydraulic model expression is as follows:
wherein:the pressure head loss, the on-way resistance loss and the local resistance loss of the ith pipeline are respectively;ρ i the length, the diameter and the working medium density of the pipeline are respectively; v i Is the average flow rate of the pipeline; lambda (lambda) i 、ξ i The friction resistance coefficient and the local resistance coefficient of the pipeline are respectively;
the power system model has the following expression:
wherein: p (P) o Injecting power for the power system node; b (B) oz 、x oz 、P oz Branch susceptance, branch reactance and branch transmission power of the power system are respectively; θ o 、θ z 、Δθ oz The phase difference value is respectively the phase angle of the head end node of the branch, the phase angle of the tail end node of the branch and the phase angle difference value of the head end and the tail end of the branch of the power system;
the expression of the coupling equipment model is as follows:
H chp (t)＝γ h2e ·P chp (t)
wherein: h chp The thermal power generated for the thermoelectric unit; p (P) chp Electric power generated for the thermoelectric unit; gamma ray h2e The thermoelectric ratio is the thermoelectric unit;
the constraint condition model comprises: the system comprises a multi-period underground city electric heating interconnection energy system unit capacity constraint condition, a multi-period underground city electric heating interconnection energy system unit climbing constraint condition, a multi-period underground city electric heating interconnection energy system thermodynamic system operation constraint condition and a multi-period underground city electric heating interconnection energy system electric power system operation constraint condition.
9. The energy balance-based provincial energy internet multi-energy flow regulation and control optimization method of claim 8, wherein the method is characterized by comprising the following steps of: the capacity constraint condition expression of the multi-period underground city grade electric heating interconnection energy system unit is as follows:
wherein: P chp the upper limit and the lower limit of the power generation capacity of the thermoelectric unit are respectively; /> H chp The upper limit and the lower limit of the heat generating capacity of the thermoelectric unit are respectively adopted; />The upper limit and the lower limit of the power generation capacity of the thermal power generating unit are respectively adopted;
the climbing constraint condition expression of the multi-period underground city grade electric heating interconnection energy system unit is as follows:
wherein:ΔP chp the upward and downward climbing limit of the power generation of the thermoelectric unit is respectively carried out; />ΔH chp Respectively the heat generating directions of the thermoelectric unitsLimit climbing upwards and downwards; />The upward and downward climbing limit of the power generation of the thermal power generating unit is respectively realized;
the operation constraint condition expression of the thermodynamic system of the multi-period underground municipal electric heating interconnection energy system is as follows:
wherein:T i g 、respectively restricting the lower limit and the upper limit of the temperature of hot water supplied to the nodes;T i r 、/>respectively restricting the lower limit and the upper limit of the temperature of the node backwater hot water;m p 、/>respectively restricting the lower limit and the upper limit of the mass flow of the heating power pipeline;
the operation constraint condition expression of the electric power system of the multi-period underground city electric heating interconnection energy system is as follows:
wherein:P oz 、respectively restricting the lower limit and the upper limit of the branch capacity of the power system;θ o 、/>and the lower limit and the upper limit of the phase angle of the power system node are respectively restricted.
10. The energy balance-based provincial energy internet multi-energy flow regulation and optimization method according to claim 1, wherein the method is characterized by comprising the following steps of: the optimization result information comprises: the power flow of the electric heat energy system, the operation output of the coupling equipment, the economic operation cost of various energy equipment, the power exchange quantity and the balance information of the electric heat energy bus.
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