CN114154335A - New energy source cold-heat-electricity-steam combined supply multi-energy system structure and modeling method thereof - Google Patents
New energy source cold-heat-electricity-steam combined supply multi-energy system structure and modeling method thereof Download PDFInfo
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Abstract
The invention discloses a new energy source combined cooling heating and power and steam supply multi-energy source system structure and a modeling method thereof, and belongs to the technical field of new energy source supply, wherein the multi-energy source system structure comprises a photovoltaic energy supply system, a wind power energy supply system and a natural gas energy supply system, the photovoltaic energy supply system comprises a photovoltaic power generation system, the wind power energy supply system comprises a wind power generation system, the photovoltaic energy supply system and the wind power energy supply system are provided with an electric refrigerator and an electric heat pump, and the natural gas energy supply system comprises a gas turbine and a boiler system; the flexibility of an energy supply system is improved, cold, heat, electricity and steam energy sources are provided for different users in the region, the requirements of the users on the energy sources are met, the economical efficiency and the reliability of the system are improved, the multi-energy system can provide multiple energy sources of cold, heat, electricity and steam for the users at the same time, and compared with the traditional multi-energy system, the multi-energy system has the remarkable advantages.
Description
Technical Field
The invention belongs to the technical field of new energy supply, and particularly relates to a new energy cold-heat-electricity-steam combined supply multi-energy system structure and a modeling method thereof.
Background
A system for supplying cold, heat and electricity by combining new energy and natural gas is a main construction idea of the existing multi-energy system, and the new energy mainly refers to solar energy and wind energy. The solar energy and wind energy power generation system combines different forms of energy conversion equipment and energy storage equipment to meet different load requirements of users, and the energy of natural gas is converted into electric energy, heat energy, cold energy and the like required by the users through a natural gas generator set, a heat exchanger, a waste heat lithium bromide unit and the like. Through the system, the peak valley filling of the electric power and the natural gas can be realized, namely, the power consumption of the air conditioner of the building in summer can be reduced through the new energy and natural gas combined cooling heating and power system, and the load of a power grid is reduced. Meanwhile, the natural gas consumption in summer is improved, clean energy is fully utilized, the utilization efficiency of energy is improved, but along with the rapid development of the power industry, the energy demand of a user is continuously increased, the energy supply of a traditional energy supply system cannot meet the requirements of the user, the utilization efficiency of the traditional energy supply system is low, the energy supply types are few, and cold, heat, electricity and steam energy sources cannot be effectively provided for different users in the region.
Disclosure of Invention
In order to solve the technical problems, the invention provides a new energy source cold-heat-electricity-steam combined supply multi-energy system structure and a modeling method thereof.
The purpose of the invention is realized as follows: a new energy source cold-hot electricity-steam combined supply multi-energy system structure and a modeling method thereof are characterized in that: the multi-energy system structure comprises a photovoltaic energy supply system, a wind energy supply system and a natural gas energy supply system, wherein the photovoltaic energy supply system comprises a photovoltaic power generation system, the wind energy supply system comprises a wind power generation system, the photovoltaic energy supply system and the wind energy supply system are provided with an electric refrigerator and an electric heat pump, and the natural gas energy supply system comprises a gas turbine and a boiler system; the modeling method of the multi-energy system structure comprises the steps of establishing a photovoltaic energy supply system model, establishing a wind power energy supply system model and establishing a natural gas energy supply system model, wherein the photovoltaic energy supply system model comprises a photovoltaic power generation system model, the wind power energy supply system model comprises a wind power generation system model, the photovoltaic power generation system model and the wind power energy supply system model further comprise an electric refrigerating machine model and an electric heating pump model, and the natural gas energy supply system model comprises a gas turbine model and a boiler system model.
Further, the photovoltaic power generation system model is as follows:
in the formula, PPVRepresents the actual output power (kW) of the photovoltaic cell assembly; pSTCRepresents the maximum output power (kW) of the photovoltaic cell under standard conditions; gINGRepresenting the actual solar radiation intensity (W/square meter); gSTCRepresents the irradiation intensity under STC condition; k represents a temperature power coefficient (%/DEG C); t isCRepresenting the actual working temperature (DEG C) of the panel; t isrRepresents a reference temperature;
the wind power generation system model is as follows:
in the formula, PWTRepresents the output power (kW) of the wind power generation; prRepresents the rated power (kW) of the wind turbine; v represents an actual wind speed (m/s); v. ofr、vci、vvoThe rated wind speed, cut-in wind speed and cut-out wind speed of the generator are respectively represented.
Further, the gas turbine model is:
in the formula, GMT(t) denotes the natural gas consumption (m) over a period of t3) (ii) a L represents the low heating value (kwh/m) of natural gas3)；Pe,MT(t) represents the net output electrical power (kW) of the gas turbine over a period t;
representing the total efficiency of power generation of the gas turbine during the period t;
the boiler system comprises an industrial steam boiler and a gas-fired boiler, the boiler system model comprises an industrial steam boiler model and a gas-fired boiler model, and the industrial steam boiler model is as follows:
QIGB＝ηIGBGIGB×L
in the formula, QIGBRepresents the calorific value (kJ/h) of the industrial steam boiler; etaIGBIndicating industrial steamThe working efficiency of the boiler; gIGBIndicating the consumption (m) of natural gas from an industrial steam boiler3H); l represents the lower heating value (kJ/m) of natural gas3)；H1Expressing the inlet water enthalpy value (kJ/kg) of the industrial steam boiler; h2Expressing the steam supply enthalpy value (kJ/kg) of the industrial steam boiler; q. q.smRepresents the superheated steam quantity (t/h) of the industrial steam boiler;
the gas boiler model is as follows:
QGB＝ηGBGGB×L
in the formula, QGBRepresenting the thermal power output by the gas boiler; etaGBRepresents the operating efficiency of the gas boiler: gGBFuel consumption (m) of gas boiler3/h)。
Further, photovoltaic energy supply system and wind energy supply system dispose the accumulate device, the model of accumulate device is:
in the formula, Es(t) represents the remaining capacity of the power storage device at time t; alpha is alphainRepresents the charging efficiency; pin(t) represents the stored charging power at time t; t is te,inRepresents a charging period; pout(t) represents the discharge power stored at time t; t is te,outRepresents a discharge time period; β represents a self-discharge coefficient; Δ teIndicating the operating time of the power storage device.
Further, natural gas energy supply system still includes heat accumulation groove and vapour storage device, natural gas energy supply system model includes heat accumulation groove model and vapour storage device model, the heat accumulation groove model is:
in the formula, Hs(t) represents the residual heat quantity of the heat storage tank at time t; deltainIndicating the heat storage efficiency; qin(t) represents the amount of stored heat at time t; t is th,inIndicating the heat storage time; qout(t) represents the heat release stored at time t; t is th,outIndicates the length of the exotherm; λ represents the self-heat release coefficient; Δ thRepresents the working time of the heat storage tank;
the steam storage device model is as follows:
in the formula, MSARepresents the amount of storage of steam (t) in the steam storage device;
indicating the storage amount of the initial steam in the steam storage device; q. q.sm,cha，qm,disRepresenting the amount of steam (t/h) stored and released by the steam storage device; dt represents a time step.
Further, the heating model of the electric heating pump is as follows:
in the formula (I), the compound is shown in the specification,
output power (kW) representing heat generation of the electric heat pump;
the working efficiency of the heating of the electric heating pump is shown;
input power (kW) representing heat generation of the electric heat pump;
the electric heat pump refrigeration model is as follows:
in the formula (I), the compound is shown in the specification,
the output power (kW) of the electric heat pump for refrigeration is represented;
the working efficiency of the electric heat pump refrigeration is shown;
represents the input power (kW) of the electric heat pump for refrigeration.
Further, the electric refrigerator model:
in the formula (I), the compound is shown in the specification,
represents the output power (kW) of the electric refrigerator;
representing the operating efficiency of the electric refrigerator;
representing the input power (kW) of the electric refrigerator.
Compared with the prior art, the invention has the outstanding and beneficial technical effects that: the multi-energy system is a multi-energy network system which gathers various energy supply devices, energy conversion devices, energy storage devices and different loads together, can realize energy complementation based on the new energy network system, further completes self regulation and control, improves the flexibility of the system, provides cold, heat, electricity and steam energy for different users in an area, meets the requirements of the users on the energy, improves the economy and the reliability of the system, can simultaneously provide multiple energy sources of cold, heat, electricity and steam for the users, can realize conversion among different energy sources, further improves the utilization efficiency of the energy sources in the area, and has obvious advantages compared with the traditional multi-energy system.
Drawings
FIG. 1 is a schematic structural diagram of a new energy combined cooling, heating, power and steam multi-energy system;
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following description, with reference to the drawings in the embodiments of the present invention, clearly and completely describes the technical solution in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, in order to solve the problems of low utilization efficiency of new energy, few energy supply types and the like, the invention provides the following technical scheme: a new energy combined cooling heating and power and steam supply multi-energy system structure and a modeling method thereof are provided, wherein the multi-energy system structure comprises a photovoltaic energy supply system, a wind power energy supply system and a natural gas energy supply system, the photovoltaic energy supply system comprises a photovoltaic power generation system, the wind power energy supply system comprises a wind power generation system, the photovoltaic energy supply system and the wind power energy supply system are provided with an electric refrigerator, an electric heat pump and an electric storage device, the natural gas energy supply system comprises a gas turbine, a boiler system, a heat storage tank and a steam storage device, and the boiler system comprises an industrial steam boiler and a gas boiler; photovoltaic energy supply system, wind-force energy supply system can satisfy user's cold, heat and electric load, when new energy system's generated energy is not enough, by the load that natural gas energy supply system or electric wire netting supply are not enough, when the generated energy is surplus, with electric energy storage or turn into heat energy storage in the middle of the heat accumulation groove.
The modeling method of the multi-energy system structure comprises the steps of establishing a photovoltaic energy supply system model, establishing a wind power energy supply system model and establishing a natural gas energy supply system model, wherein the photovoltaic energy supply system model comprises a photovoltaic power generation system model, the wind power energy supply system model comprises a wind power generation system model, the photovoltaic power generation system model and the wind power energy supply system model further comprise an electric refrigerator model, an electric heat pump model and an electricity storage device model, the natural gas energy supply system model comprises a gas turbine model, a heat storage tank model, a steam storage device model and a boiler system model, and the boiler system model comprises an industrial steam boiler model and a gas boiler model.
Under the general standard condition, according to the solar irradiation intensity and the battery temperature, a photovoltaic power generation system model is established as follows:
in the formula, PPVRepresents the actual output power (kW) of the photovoltaic cell assembly; pSTCRepresents the maximum output power (kW) of the photovoltaic cell under standard conditions; gINGRepresenting the actual solar radiation intensity (W/square meter); gSTCThe irradiation intensity under the STC condition is 1000W/square meter; k represents a temperature power coefficient (%/DEG C); t isCRepresenting the actual working temperature (DEG C) of the panel; t isrDenotes the reference temperature, 25 ℃;
establishing a wind power generation system model:
in the formula, PWTRepresents the output power (kW) of the wind power generation; prRepresents the rated power (kW) of the wind turbine; v represents an actual wind speed (m/s); v. ofr、vci、vvoAnd respectively representing the rated wind speed, the cut-in wind speed and the cut-out wind speed of the generator, and when the actual wind speed does not reach the cut-in wind speed, keeping the unit in a standby state and enabling the output to be 0.
The electric refrigerator model:
in the formula (I), the compound is shown in the specification,
represents the output power (kW) of the electric refrigerator;
representing the operating efficiency of the electric refrigerator;
representing the input power (kW) of the electric refrigerator.
The heating model of the electric heating pump is as follows:
in the formula (I), the compound is shown in the specification,
output power (kW) representing heat generation of the electric heat pump;
the working efficiency of the heating of the electric heating pump is shown;
input power (kW) representing heat generation of the electric heat pump;
the electric heat pump refrigeration model is as follows:
in the formula (I), the compound is shown in the specification,
the output power (kW) of the electric heat pump for refrigeration is represented;
the working efficiency of the electric heat pump refrigeration is shown;
electric heating pumpInput power (kW) for refrigeration.
The gas turbine model is as follows:
in the formula, GMT(t) denotes the natural gas consumption (m) over a period of t3) (ii) a L represents the low heating value (kwh/m) of natural gas3)；Pe,MT(t) represents the net output electrical power (kW) of the gas turbine over a period t;
representing the total efficiency of power generation of the gas turbine during the period t;
the industrial steam boiler model is as follows:
QIGB＝ηIGBGIGB×L
in the formula, QIGBRepresents the calorific value (kJ/h) of the industrial steam boiler; etaIGBRepresenting the working efficiency of the industrial steam boiler; gIGBIndicating the consumption (m) of natural gas from an industrial steam boiler3H); l represents the lower heating value (kJ/m) of natural gas3)；H1Expressing the inlet water enthalpy value (kJ/kg) of the industrial steam boiler; h2Expressing the steam supply enthalpy value (kJ/kg) of the industrial steam boiler; q. q.smRepresents the superheated steam quantity (t/h) of the industrial steam boiler;
the gas boiler model is as follows:
QGB＝ηGBGGB×L
in the formula, QGBRepresenting the thermal power output by the gas boiler; etaGBRepresents the operating efficiency of the gas boiler: gGBFuel consumption (m) of gas boiler3/h)；
Modeling an energy storage device, wherein the model of the power storage device is as follows:
in the formula, Es(t) represents the remaining capacity of the power storage device at time t; alpha is alphainRepresents the charging efficiency; pin(t) represents the stored charging power at time t; t is te,inRepresents a charging period; pout(t) represents the discharge power stored at time t; t is te,outRepresents a discharge time period; β represents a self-discharge coefficient; Δ teRepresenting the operating time of the electricity storage device;
the heat storage tank model is as follows:
in the formula, Hs(t) represents the residual heat quantity of the heat storage tank at time t; deltainIndicating the heat storage efficiency; qin(t) represents the amount of stored heat at time t; t is th,inIndicating the heat storage time; qout(t) represents the heat release stored at time t; t is th,outIndicates the length of the exotherm; λ represents the self-heat release coefficient; Δ thRepresents the working time of the heat storage tank;
the steam storage device model is as follows:
in the formula, MSARepresents the amount of storage of steam (t) in the steam storage device;
indicating the storage amount of the initial steam in the steam storage device; q. q.sm,cha，qm,disRepresenting the amount of steam (t/h) stored and released by the steam storage device; dt represents a time step.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Claims (7)
1. A new energy source cold-hot electricity-steam combined supply multi-energy system structure and a modeling method thereof are characterized in that: the multi-energy system structure comprises a photovoltaic energy supply system, a wind energy supply system and a natural gas energy supply system, wherein the photovoltaic energy supply system comprises a photovoltaic power generation system, the wind energy supply system comprises a wind power generation system, the photovoltaic energy supply system and the wind energy supply system are provided with an electric refrigerator and an electric heat pump, and the natural gas energy supply system comprises a gas turbine and a boiler system;
the modeling method of the multi-energy system structure comprises the steps of establishing a photovoltaic energy supply system model, establishing a wind power energy supply system model and establishing a natural gas energy supply system model, wherein the photovoltaic energy supply system model comprises a photovoltaic power generation system model, the wind power energy supply system model comprises a wind power generation system model, the photovoltaic power generation system model and the wind power energy supply system model further comprise an electric refrigerating machine model and an electric heating pump model, and the natural gas energy supply system model comprises a gas turbine model and a boiler system model.
2. The new-energy combined cooling heating and power and steam multi-energy system structure and the modeling method thereof according to claim 1, wherein the photovoltaic power generation system model is as follows:
in the formula, PPVRepresents the actual output power (kW) of the photovoltaic cell assembly; pSTCRepresents the maximum output power (kW) of the photovoltaic cell under standard conditions; gINGRepresents the actual solar radiation intensity (W +)㎡)；GSTCRepresents the irradiation intensity under STC condition; k represents a temperature power coefficient (%/DEG C); t isCRepresenting the actual working temperature (DEG C) of the panel; t isrRepresents a reference temperature;
the wind power generation system model is as follows:
in the formula, PWTRepresents the output power (kW) of the wind power generation; prRepresents the rated power (kW) of the wind turbine; v represents an actual wind speed (m/s); v. ofr、vci、vvoThe rated wind speed, cut-in wind speed and cut-out wind speed of the generator are respectively represented.
3. The new energy combined cooling heating power and steam power multi-energy system structure and the modeling method thereof according to claim 1, wherein the gas turbine model is:
in the formula, GMT(t) denotes the natural gas consumption (m) over a period of t3) (ii) a L represents the low heating value (kwh/m) of natural gas3)；Pe,MT(t) represents the net output electrical power (kW) of the gas turbine over a period t;
representing the total efficiency of power generation of the gas turbine during the period t;
the boiler system comprises an industrial steam boiler and a gas-fired boiler, the boiler system model comprises an industrial steam boiler model and a gas-fired boiler model, and the industrial steam boiler model is as follows:
QIGB＝ηIGBGIGB×L
in the formula, QIGBRepresents the calorific value (kJ/h) of the industrial steam boiler; etaIGBRepresenting the working efficiency of the industrial steam boiler; gIGBIndicating the consumption (m) of natural gas from an industrial steam boiler3H); l represents the lower heating value (kJ/m) of natural gas3)；H1Expressing the inlet water enthalpy value (kJ/kg) of the industrial steam boiler; h2Expressing the steam supply enthalpy value (kJ/kg) of the industrial steam boiler; q. q.smRepresents the superheated steam quantity (t/h) of the industrial steam boiler;
the gas boiler model is as follows:
QGB＝ηGBGGB×L
in the formula, QGBRepresenting the thermal power output by the gas boiler; etaGBRepresents the operating efficiency of the gas boiler: gGBFuel consumption (m) of gas boiler3/h)。
4. The structure of a new-energy combined cooling heating and power and steam multi-energy system and the modeling method thereof according to claim 1, wherein the photovoltaic energy supply system and the wind energy supply system are configured with an electricity storage device, and the model of the electricity storage device is as follows:
in the formula, Es(t) represents the remaining capacity of the power storage device at time t; alpha is alphainRepresents the charging efficiency; pin(t) represents the stored charging power at time t; t is te,inRepresents a charging period; pout(t) represents the discharge power stored at time t; t is te,outRepresents a discharge time period; β represents a self-discharge coefficient; Δ teIndicating the operating time of the power storage device.
5. The new-energy combined cooling heating and power and steam multi-energy system structure and the modeling method thereof according to claim 1, wherein the natural gas energy supply system further comprises a heat storage tank and a steam storage device, the natural gas energy supply system model comprises a heat storage tank model and a steam storage device model, and the heat storage tank model is as follows:
in the formula, Hs(t) represents the residual heat quantity of the heat storage tank at time t; deltainIndicating the heat storage efficiency; qin(t) represents the amount of stored heat at time t; t is th,inIndicating the heat storage time; qout(t) represents the heat release stored at time t; t is th,outIndicates the length of the exotherm; λ represents the self-heat release coefficient; Δ thRepresents the working time of the heat storage tank;
the steam storage device model is as follows:
in the formula, MSARepresents the amount of storage of steam (t) in the steam storage device; m0 SAIndicating the storage amount of the initial steam in the steam storage device; q. q.sm,cha，qm,disRepresenting the amount of steam (t/h) stored and released by the steam storage device; dt represents a time step.
6. The new energy combined cooling heating and power and steam multi-energy system structure and the modeling method thereof according to claim 1, wherein the electric heat pump heating model is as follows:
in the formula (I), the compound is shown in the specification,
output power (kW) representing heat generation of the electric heat pump;
the working efficiency of the heating of the electric heating pump is shown;
input power (kW) representing heat generation of the electric heat pump;
the electric heat pump refrigeration model is as follows:
in the formula (I), the compound is shown in the specification,
the output power (kW) of the electric heat pump for refrigeration is represented;
the working efficiency of the electric heat pump refrigeration is shown;
represents the input power (kW) of the electric heat pump for refrigeration.
7. The new energy combined cooling heating and power and steam combined supply multi-energy system structure and the modeling method thereof according to claim 1, wherein the electric refrigerator model is:
in the formula (I), the compound is shown in the specification,
represents the output power (kW) of the electric refrigerator;
representing the operating efficiency of the electric refrigerator;
representing the input power (kW) of the electric refrigerator.
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