CN116432896A - Comprehensive energy system energy efficiency improvement analysis method and system based on partial derivative of structural parameter - Google Patents
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Abstract
The invention discloses a comprehensive energy system energy efficiency improvement analysis method and a system based on partial derivatives of structural parameters, wherein the method comprises the following steps: analyzing energy flow characteristics of each link of the comprehensive energy system, and establishing an expression of key structural parameters affecting energy efficiency levels of energy supply links and energy conversion links; combining the energy utilization efficiency of the comprehensive energy system, and solving partial derivatives of the key structural parameters to obtain partial derivative expressions of the key structural parameters; and analyzing the characteristics of partial derivative expressions of each key structural parameter, correspondingly increasing the configuration capacity of the gas turbine or the refrigerating equipment and the heating equipment, and improving the energy utilization efficiency of the comprehensive energy system. The invention provides a method for improving the energy utilization efficiency of a comprehensive energy system by calculating and analyzing partial derivatives of structural parameters of an energy supply link and an energy conversion link on the comprehensive energy efficiency based on each link of the energy flow of the comprehensive energy system, and further improves the energy utilization efficiency of the comprehensive energy system.
Description
Technical Field
The invention belongs to the technical field of comprehensive energy efficiency analysis, and relates to a comprehensive energy system energy efficiency improvement analysis method and system based on partial derivatives of structural parameters.
Background
With the rapid development of human society, how to efficiently utilize energy becomes a hotspot problem worldwide. In the integrated energy system, energy flows in each link of 'supply-transfer-transmission-storage-use', and the utilization efficiency of energy is influenced.
The comprehensive energy system comprises various energy systems such as electricity, gas, heat, cold and the like, is deeply coupled in each link of energy production, conversion, transmission, storage and demand, and provides demand guarantee of electricity/heat/cold load for users in a high-efficiency environment-friendly mode. However, there are many factors that affect energy efficiency, such as the coupling of the energy flow links to each other.
Therefore, how to analyze the influence of the equipment parameters and the energy proportion in the system on the energy efficiency level starts from the energy utilization efficiency of the comprehensive energy system, and has important significance for improving the energy utilization level of the comprehensive energy system.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a comprehensive energy system energy efficiency improving analysis method and system based on the partial derivative of structural parameters, and the method for improving the comprehensive energy system energy utilization efficiency is provided by calculating and analyzing the partial derivative of the structural parameters of an energy supply link and an energy conversion link on the comprehensive energy efficiency based on each link of the energy flow of the comprehensive energy system, so that the energy utilization efficiency of the comprehensive energy system is further improved.
In order to achieve the above object, the present invention adopts the following technical scheme:
an integrated energy system energy efficiency improvement analysis method based on partial derivatives of structural parameters, the method comprising the following steps:
step 1: analyzing energy flow characteristics of each link of the comprehensive energy system, and establishing an expression of key structural parameters affecting energy efficiency levels of energy supply links and energy conversion links;
step 2: combining the energy utilization efficiency of the comprehensive energy system, and solving partial derivatives of the key structural parameters to obtain partial derivative expressions of the key structural parameters;
step 3: and analyzing the characteristics of partial derivative expressions of each key structural parameter, correspondingly increasing the configuration capacity of the gas turbine or the refrigerating equipment and the heating equipment, and improving the energy utilization efficiency of the comprehensive energy system.
The invention further comprises the following preferable schemes:
preferably, in step 1, the key structural parameters affecting the energy efficiency level of the energy supply ring include renewable energy parameters, namely, the ratio SW 'of the renewable energy generated energy to the pure electric input of the energy transmission link after being converted into primary energy' 0 The expression is:
wherein sigma e The primary energy consumption conversion coefficient of outsourcing electricity is calculated;
SW' re the energy generation amount is distributed energy;
E out,e the energy output of the conversion link.
Preferably, in step 1, the key structural parameters affecting the energy efficiency level of the energy conversion link include:
1) Gas energy conversion equipment proportion lambda B/CHP The expression is:
wherein G is B The natural gas consumption of the gas boiler is represented;
G CHP representing the amount of fuel consumed by the cogeneration plant, i.e., the gas turbine;
2) Ratio lambda of electric heating capacity to total heating capacity of system h The expression is:
wherein E is h The electric power consumption of the electric heating machine;
η COP,h is the electric heating efficiency;
E out,h the heat energy output of the conversion link;
3) Ratio lambda of electric refrigerating capacity to total refrigerating capacity of system c The expression is:
wherein E is c The power consumption of the electric refrigerator;
η COP,c is the efficiency of the absorption refrigerator;
E out,c is the cold energy output of the conversion link.
Preferably, in step 2, the energy utilization efficiency η of the integrated energy system is IES The expression of (2) is:
wherein lambda is c/e Is a cold and electrical structural parameter;
λ h/e is a thermal and electrical structural parameter;
Q E is the energy consumption proportion.
Preferably, the cold and electrical structural parameter lambda c/e The method comprises the following steps:
wherein E is out,c The cold energy output of the energy conversion link is realized;
E out,e the electric energy output quantity of the conversion link;
thermal and electrical structural parameters lambda h/e The method comprises the following steps:
wherein E is out,h The heat energy output of the energy conversion link;
energy consumption ratio Q E The method comprises the following steps:
wherein C is G Is the natural gas energy coefficient;
G in natural gas demand is the comprehensive energy system;
E in the energy source system is used for outsourcing electricity.
Preferably, the partial derivative expression of the renewable energy parameter is:
analysis of the characteristics of the partial derivative expression above shows that:
the obtained partial derivative is constantly larger than 0, so that the comprehensive energy utilization efficiency is positively correlated with the renewable energy structure parameter, namely, the higher the renewable energy structure parameter value is, the higher the comprehensive energy utilization efficiency is.
Preferably, the partial derivative expression of the energy conversion device ratio is:
wherein C is G Is the energy coefficient eta of natural gas CHP,h Heating efficiency eta of gas turbine B Efficiency of gas boiler, eta CHP,e The power generation efficiency of the gas turbine;
analysis of the characteristics of the partial derivative expression shows that:
when the heat efficiency of the gas boiler
There is->
Then->
Along with->
Is decreased by the increase of the number of the total energy, so that the lambda needs to be decreased in order to improve the comprehensive energy utilization efficiency B/CHP Further, according to the fuel gas energy conversion equipment proportion lambda B/CHP The expression is that the capacity of the gas turbine needs to be increased to improve the comprehensive energy utilization efficiency.
Preferably lambda c The partial derivative expression of (2) is:
wherein eta B Efficiency of gas boiler, eta COP,h For electric heating efficiency, C G Is the energy coefficient eta of natural gas COP,c For absorption refrigerationEfficiency, eta CHP,h For the heating efficiency of the gas turbine, eta CHP,e The power generation efficiency of the cogeneration equipment is;
analysis of the characteristics of the partial derivative expression shows that:
when (when)
When (I)>
Along with->
Is increased by the increase of the ratio lambda of the combined electric refrigerating capacity to the total refrigerating capacity of the system c Expression and integrated energy system energy flow characteristics yield: to improve the comprehensive energy utilization efficiency, the configuration capacity of the electric refrigeration equipment should be increased;
when (when)
When (I)>
Along with->
Is reduced by combining the ratio lambda of the electric refrigerating capacity to the total refrigerating capacity of the system c Expression and integrated energy system energy flow characteristics yield: in order to improve the comprehensive energy utilization efficiency, the configuration capacity of the absorption refrigeration equipment should be increased.
Preferably lambda h The partial derivative expression of (2) is:
analysis of the characteristics of the partial derivative expression shows that:
when (when)
When (I)>
Along with->
Is increased by combining the ratio lambda of the electric heating quantity to the total heating quantity of the system h Expression and integrated energy system energy flow characteristics yield: to improve the comprehensive energy utilization efficiency, the configuration capacity of the electric heating equipment should be increased;
when (when)
When (I)>
Along with->
Is reduced by combining the ratio lambda of the amount of electric heating to the total amount of heating of the system h Expression and integrated energy system energy flow characteristics yield: in order to improve the comprehensive energy utilization efficiency, the configuration capacity of the gas heating equipment should be increased.
An integrated energy system energy efficiency improvement analysis system based on partial derivatives of structural parameters specifically comprises:
the key structural parameter establishing module is used for analyzing the energy flow characteristics of each link of the comprehensive energy system and establishing an expression of key structural parameters affecting the energy efficiency level of the energy supply link and the energy conversion link;
the partial derivative calculation module is used for solving partial derivatives of the key structural parameters by combining the energy utilization efficiency of the comprehensive energy system to obtain partial derivative expressions of the key structural parameters;
the energy efficiency improvement analysis module is used for analyzing the characteristics of partial derivative expressions of each key structural parameter, correspondingly increasing the configuration capacity of the gas turbine or the refrigerating equipment and the heating equipment, and improving the energy utilization efficiency of the comprehensive energy system.
A terminal comprising a processor and a storage medium; the storage medium is used for storing instructions;
the processor is used for operating according to the instruction to execute the step of the comprehensive energy system energy efficiency improvement analysis method based on the structural parameter partial derivative.
A computer readable storage medium having stored thereon a computer program which when executed by a processor implements the steps of the integrated energy system energy efficiency enhancement analysis method based on partial derivatives of structural parameters.
The invention has the beneficial effects that compared with the prior art:
according to the invention, related factors influencing the energy utilization efficiency of the comprehensive energy system are analyzed from the angle of system energy flow, key structural parameters such as the proportion of gas energy conversion equipment, the ratio of electric heating capacity to total system heating capacity, the ratio of electric refrigerating capacity to total system refrigerating capacity and the like are established, the relation between an energy supply link, an energy conversion link, a transmission link, an energy storage link and the energy utilization efficiency of the comprehensive energy system is analyzed, and the energy utilization level of the comprehensive energy system can be improved and promoted in a targeted manner by combining the analysis method of partial derivatives, so that guidance and reference are provided for the configuration of the energy equipment of the comprehensive energy system.
Drawings
FIG. 1 is a flow chart of an energy efficiency enhancement analysis method of a comprehensive energy system based on partial derivatives of structural parameters;
fig. 2 is a cold-hot-electric energy flow diagram of the integrated energy system of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The embodiments described herein are merely some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art without making any inventive effort, are within the scope of the present invention.
As shown in fig. 1, embodiment 1 of the present invention provides a comprehensive energy system energy efficiency improvement analysis method based on partial derivatives of structural parameters, and in a preferred but non-limiting embodiment of the present invention, the method includes the following steps:
step 1: analyzing energy flow characteristics of each link of the comprehensive energy system, analyzing energy efficiency levels from the perspective of a network structure of the comprehensive energy system, providing key structural parameters influencing the energy efficiency levels of energy supply links and energy conversion links, and deducing expressions of the key structural parameters;
further preferably, the specific derivation procedure is as follows:
as shown in fig. 2, the main equipment in the integrated energy system comprises a gas turbine, waste heat recovery, a gas boiler, an absorption refrigerator, an electric refrigerator and the like; an energy storage unit is configured in the system and mainly comprises an electricity storage device, a cold storage device, a heat storage device and the like; the energy supply mainly comes from power grid electricity purchasing, natural gas and distributed energy power generation; in the energy conversion link, electric energy, heat energy and cold energy are converted through electric heat generating equipment and electric refrigerating equipment, and the energy is further coupled through cooperation of the cogeneration equipment and the absorption refrigerating machine.
1. Firstly, the following comprehensive energy system energy flow characteristic analysis is carried out:
1. energy supply link
The system power supply balance equation:
E in +E re +G CHP η CHP,e ＝E h +E c +E out,e (1)
wherein E is in Outsourcing electricity for the comprehensive energy system;
E re the method is characterized in that the energy generation amount of distributed energy sources such as photovoltaic and wind power in a system is calculated;
η CHP,e generating efficiency for the cogeneration equipment;
G CHP the fuel gas amount consumed by the cogeneration equipment;
E h the power consumption of the electric refrigerating heat;
E c the power consumption of the electric refrigerator;
E out,e the electric energy output quantity of the conversion link;
system natural gas supply balance equation:
G in ＝G CHP +G B (2)
wherein G is in Natural gas demand is the comprehensive energy system;
G B natural gas consumption of the gas boiler;
2. energy conversion link
And (3) outputting electric energy:
E out,e
and (3) outputting heat energy:
E out,h ＝C h [E h η COP,h +G CHP η CHP,h (1-λ CHP )+G B η B ] (3)
wherein E is out,h The heat energy output of the conversion link;
C h the energy coefficient of the thermal load;
η COP,h is the electric heating efficiency;
η CHP,h heating efficiency of the cogeneration equipment;
λ CHP the proportion of heat produced by the cogeneration equipment to be supplied to the absorption refrigerator;
η B the heating efficiency of the gas boiler is achieved.
Cold energy output:
E out,c ＝C c (G CHP η CHP,h λ CHP η COP,c +E c η COP,e ) (4)
wherein E is out,c The cold energy output of the conversion link is obtained;
C c is the energy coefficient of the cold load;
η COP,c is the efficiency of the absorption refrigerator;
η COP,e is the efficiency of the electric refrigerator.
η CHP,e The power generation efficiency of the cogeneration equipment.
3. Energy transmission link
The electric energy output after electric energy transmission is as follows:
E tr,e ＝E out,e η tr,e (5)
wherein E is tr,e The electric energy output quantity of the transmission link;
η tr,e the power transmission efficiency is;
the heat energy output after heat energy transmission is as follows:
E tr,h ＝E out,h η tr,h (6)
wherein E is tr,h The heat energy output of the transmission link;
η tr,h is the heat energy transmission efficiency.
The cold energy output after cold energy transmission is as follows:
E tr,c ＝E out,c η tr,c (7)
wherein E is tr,c The cold energy output quantity of the transmission link is;
η tr,c is the cold energy transmission efficiency.
4. Energy storage link
Considering only energy storage, the amount of stored energy is: s is S e η s,e The heat storage capacity is as follows: s is S h η s,h The cold storage capacity is as follows: s is S c η s,c 。
Wherein S is e Is the capacity of the electricity storage equipment;
S h the capacity of the heat storage equipment;
S c is the capacity of the cold storage equipment;
η s,e efficiency for the electricity storage device;
η s,h efficiency for the heat storage device;
η s,c efficiency for the cold storage device;
5. energy demand link
The electrical load is: l (L) e ＝E tr,e -S e ＝E out,e η tr,e -S e (8)
The thermal load is: l (L) h ＝E tr,h -S h ＝E out,h η tr,h -S h (9)
The cold load is: l (L) c ＝E tr,c -S c ＝E out,c η tr,c -S c (10)
Wherein L is e The electric load requirement of the comprehensive energy system is met;
L h the heat load requirement of the comprehensive energy system is met;
L c is a comprehensive energy system cold load demand.
2. Secondly, analyzing the influence of each link on the energy utilization efficiency of the comprehensive energy system, providing key structural parameters influencing the energy efficiency level of the energy supply link and the energy conversion link, and deducing the expression thereof;
comprehensive energy utilization efficiency of the energy system:
wherein C is G Is the natural gas energy coefficient;
C h is the thermal energy coefficient;
C c is the cold energy coefficient.
1. Influence of energy storage link on energy utilization efficiency of comprehensive energy system
Only stored energy but not stored energy is considered in the above formula (11):
obviously, S is reduced e 、S h 、S c The energy storage capacity is increased, the direct supply of electricity, heat, cold and the like is increased, and the high energy utilization efficiency can be obtained.
Only stored energy is considered but not:
at this time, it is assumed that the storage energies are Δs respectively e ＝S e η s,e 、ΔS h ＝S h η s,h 、ΔS c ＝S c η s,c The energy utilization efficiency of the comprehensive energy system is changed into:
obviously, the energy storage efficiency is improved, and the high energy utilization efficiency can be obtained.
2. Influence of transmission links on energy utilization efficiency of comprehensive energy system
It is assumed that the number of the sub-blocks,
the energy utilization efficiency of the comprehensive energy system is as follows:
assuming that s=0, i.e. without considering energy storage, the energy utilization efficiency of the comprehensive energy system is:
obviously, the higher the efficiency of the transmission link, the higher the energy utilization efficiency of the comprehensive energy system.
3. Influence of energy supply and conversion links on energy utilization efficiency of comprehensive energy system
Assuming transmission link efficiency η tr,e ＝1，η tr,h ＝1，η tr,c =1, the comprehensive energy system energy utilization efficiency is:
defining cold and electrical structural parameters
(representing the ratio of the cold energy output of the energy conversion link to the pure electrical input of the energy transmission link);
definition of thermal and electrical structural parameters
(representing the ratio of the thermal energy output of the energy conversion link to the pure electrical input of the energy transmission link);
definition of the ratio of gas energy conversion devices
(i.e., the ratio of the gas amount consumed by the gas boiler to the cogeneration plant in the system);
the energy utilization efficiency of the comprehensive energy system is as follows:
definition of the definition
(i.e. the ratio of the amount of fuel consumed by the cogeneration plant to the pure electrical input of the energy transmission link), further, it is possible to obtain:
definition of the definition
(i.e. the ratio of the amount of electrical heating to the total amount of heating of the system),>
(i.e. the ratio of the amount of electrical refrigeration to the total amount of refrigeration in the system),
definition of the definition
(namely the ratio of the generated energy of the renewable energy source to the pure electric input of the transmission link after being converted into primary energy source),
wherein sigma e The primary energy consumption conversion coefficient of outsourcing electricity is calculated;
SW r ' e the energy generation capacity is distributed energy sources such as solar energy, wind energy and the like;
definition of the definition
(i.e., the ratio of the total amount of non-renewable energy consumed by the system to the pure electrical input of the energy transmission link);
from formulae (1) and (2)
Then, it is possible to obtain:
in summary, the invention analyzes the energy efficiency level from the view of the comprehensive energy system network structure, and proposes the following key structural parameters affecting the energy efficiency level of the energy supply link and the energy conversion link:
1. the key structural parameters affecting the energy efficiency level of the energy supply ring are as follows:
renewable energy parameters specifically include:
ratio SW 'of renewable energy generating capacity converted into primary energy and pure electric input in energy transmission link' 0 The expression is:
wherein sigma e The primary energy consumption conversion coefficient of outsourcing electricity is calculated;
SW' re the energy generation capacity is distributed energy sources such as solar energy, wind energy and the like;
E out,e the energy output of the conversion link, namely the pure electric input of the energy transmission link;
2. the key structural parameters affecting the energy efficiency level of the energy conversion link are as follows:
1) Ratio of energy conversion devices
Natural gas is consumed by a gas boiler and a gas turbine in the system, and the ratio of the two fuel gas consumption is defined as lambda B/CHP The expression is:
λ B/CHP ＝G B /G CHP ；
wherein G is B The natural gas consumption of the gas boiler is represented;
G CHP representing the amount of fuel gas consumed by the cogeneration plant;
2) Ratio lambda of electric heating capacity to total heating capacity of system h The expression is:
wherein E is h The electric power consumption of the electric heating machine;
η COP,h is the electric heating efficiency;
E out,h the heat energy output of the conversion link;
3) Ratio lambda of electric refrigerating capacity to total refrigerating capacity of system c The expression is:
wherein E is c The power consumption of the electric refrigerator;
η COP,c is the efficiency of the absorption refrigerator;
E out,c is the cold energy output of the conversion link.
Step 2: combining the expression of the energy utilization efficiency of the comprehensive energy system, and obtaining partial derivatives of the key structural parameters to obtain partial derivative expressions of the key structural parameters;
further preferably, the energy utilization efficiency expression of the integrated energy system is modified according to the energy supply link, the conversion link, the transmission link, the storage link and the demand link equations of the integrated energy system, and is builtEnergy utilization efficiency eta of vertical comprehensive energy system IES The expression of (2) is:
wherein lambda is c/e Describing the relation between the energy utilization efficiency and the energy demand links for the cold and electric structural parameters;
λ h/e is a thermal and electrical structural parameter;
Q E is the energy consumption proportion.
Further preferably, the cold and electrical structural parameter lambda c/e The method comprises the following steps:
the ratio of cold energy output of the energy conversion link to pure electric input of the energy transmission link is represented;
wherein, E out,c The cold energy output of the energy conversion link is realized;
E out,e the energy output of the conversion link, namely pure electric input of the energy transmission link;
thermal and electrical structural parameters lambda h/e The method comprises the following steps:
the ratio of the heat energy output of the energy conversion link to the pure electric input of the energy transmission link is represented;
wherein E is out,h The heat energy output of the energy conversion link;
energy consumption ratio Q E The method comprises the following steps:
energy consumption ratio Q E The ratio of the total amount of non-renewable energy consumed by the system to the pure electric input of the energy transmission link.
Wherein C is G Is the natural gas energy coefficient;
G in natural gas demand is the comprehensive energy system;
E in the energy source system is used for outsourcing electricity.
Step 3: and analyzing the characteristics of partial derivative expressions of each key structural parameter, correspondingly increasing the configuration capacity of the gas turbine or the refrigerating equipment and the heating equipment, and improving the energy utilization efficiency of the comprehensive energy system.
1. Supply link
The partial derivative expression of the renewable energy parameters is:
analysis of the characteristics of the partial derivative expression above shows that:
the obtained partial derivative is constantly larger than 0, so that the higher the comprehensive energy utilization efficiency is in positive correlation with the renewable energy structural parameter, namely the higher the renewable energy structural parameter value is, the higher the comprehensive energy utilization efficiency is, namely the comprehensive energy utilization efficiency is in positive correlation with the distributed energy generating capacity of photovoltaic, wind energy and the like, and the higher the distributed energy generating capacity of the photovoltaic, wind energy and the like in the system is, the higher the comprehensive energy utilization efficiency is.
2. Conversion link
Here, SW, regardless of the generation of distributed energy such as photovoltaic and wind 0 ' =0, then the energy conversion key structure parameter (λ B/CHP ，λ h ，λ c ) Deviation guide is calculated:
1) The partial derivative expression of the energy conversion equipment proportion is as follows:
wherein C is G Is the energy coefficient of the natural gas,η CHP,h heating efficiency eta of gas turbine B Efficiency of gas boiler, eta CHP,e The power generation efficiency of the gas turbine;
analysis of the characteristics of the partial derivative expression shows that:
when the heat efficiency of the gas boiler
There is->
Then->
Along with->
Is reduced by the increase of the number of the energy sources, so that the comprehensive energy utilization efficiency eta is improved IES Then the lambda needs to be reduced B/CHP Further, according to the aforementioned energy conversion device ratio lambda B/CHP The model needs to increase the capacity of the gas turbine, namely, the comprehensive energy utilization efficiency can be improved by increasing the configuration capacity of the cogeneration equipment.
2)λ c The partial derivative expression of (2) is:
wherein eta B Efficiency of gas boiler, eta COP,h For electric heating efficiency, C G Is the energy coefficient eta of natural gas COP,c For absorption chiller efficiency, eta CHP,h For the heating efficiency of the gas turbine, eta CHP,e The power generation efficiency of the cogeneration equipment is;
analysis of the characteristics of the partial derivative expression shows that:
when (when)
When (I)>
Along with->
Is increased by the increase of the ratio lambda of the combined electric refrigerating capacity to the total refrigerating capacity of the system c Expression and integrated energy system energy flow characteristics yield: to improve the comprehensive energy utilization efficiency, the configuration capacity of the electric refrigeration equipment should be increased;
when (when)
When (I)>
Along with->
Is reduced by combining the ratio lambda of the electric refrigerating capacity to the total refrigerating capacity of the system c Expression and integrated energy system energy flow characteristics yield: in order to improve the comprehensive energy utilization efficiency, the configuration capacity of the absorption refrigeration equipment should be increased.
The specific analysis process is as follows:
from the above, lambda can be known c The expression is:
the formula (4) in the energy flow characteristic analysis of the integrated energy system is combined to know that:
E out,c ＝C c (G CHP η CHP,h λ CHP η COP,c +E c η COP,e ) (4)
the further derivation formula is as follows:
wherein: g CHP η CHP,h λ CHP η COP,c For absorbing the refrigerating capacity E c η COP,e Is the electric refrigerating capacity.
3)λ h The partial derivative expression of (2) is:
analysis of the characteristics of the partial derivative expression shows that:
when (when)
When (I)>
Along with->
The increase of the electric heating equipment is that the configuration capacity of the electric heating equipment is increased in order to improve the comprehensive energy utilization efficiency;
when (when)
When (I)>
Along with->
In order to increase the comprehensive energy utilization efficiency, the configuration capacity of the gas heating equipment should be increased, and the ratio of the gas boiler to the cogeneration equipment is +.>
Proportioning.
Analysis of the characteristics of the partial derivative expression shows that:
when (when)
When (I)>
Along with->
Is increased by combining the ratio lambda of the electric heating quantity to the total heating quantity of the system h Expression and integrated energy system energy flow characteristics yield: to improve the comprehensive energy utilization efficiency, the configuration capacity of the electric heating equipment should be increased;
when (when)
When (I)>
Along with->
Is reduced by combining the ratio lambda of the amount of electric heating to the total amount of heating of the system h Expression and integrated energy system energy flow characteristics yield: in order to improve the comprehensive energy utilization efficiency, the configuration capacity of the gas heating equipment should be increased.
The specific analysis process is as follows:
from the above, lambda can be known h The expression is:
the formula (3) in the energy flow characteristic analysis of the integrated energy system is combined to know that:
E out, h ＝C h [E h η COP,h +G CHP η CHP,h (1-λ CHP )+G B η B ] (3)
then, the following is further deduced:
wherein E is h η COP,h Is the quantity of electric heating equipment; e (E) B η B Is the heating quantity of the fuel gas.
The embodiment 2 of the invention provides an integrated energy system energy efficiency improvement analysis system based on a partial derivative of a structural parameter, wherein the system is used for the integrated energy system energy efficiency improvement analysis method based on the partial derivative of the structural parameter, and the system specifically comprises the following steps:
the key structural parameter establishing module is used for analyzing the energy flow characteristics of each link of the comprehensive energy system and establishing an expression of key structural parameters affecting the energy efficiency level of the energy supply link and the energy conversion link;
the partial derivative calculation module is used for solving partial derivatives of the key structural parameters by combining the energy utilization efficiency of the comprehensive energy system to obtain partial derivative expressions of the key structural parameters;
the energy efficiency improvement analysis module is used for analyzing the characteristics of partial derivative expressions of each key structural parameter, correspondingly increasing the configuration capacity of the gas turbine or the refrigerating equipment and the heating equipment, and improving the energy utilization efficiency of the comprehensive energy system.
Embodiment 3 of the present invention provides a terminal including a processor and a storage medium; the storage medium is used for storing instructions;
the processor is used for operating according to the instruction to execute the step of the comprehensive energy system energy efficiency improvement analysis method based on the structural parameter partial derivative.
Embodiment 4 of the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the integrated energy system energy efficiency enhancement analysis method based on partial derivatives of structural parameters.
The invention has the beneficial effects that compared with the prior art:
the invention can analyze the related factors affecting the energy utilization efficiency of the comprehensive energy system, and determine the relation between the energy supply link and the energy conversion link and the energy utilization efficiency of the comprehensive energy system, in particular to the key structural parameters such as the permeability of renewable energy, the cold/heat/electricity demand ratio and the like; the analysis method based on the partial derivative can improve the energy utilization level of the comprehensive energy system in a targeted manner, and provide guidance and reference for the configuration of energy equipment of the comprehensive energy system.
The present disclosure may be a system, method, and/or computer program product. The computer program product may include a computer readable storage medium having computer readable program instructions embodied thereon for causing a processor to implement aspects of the present disclosure.
The computer readable storage medium may be a tangible device that can hold and store instructions for use by an instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: portable computer disks, hard disks, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static Random Access Memory (SRAM), portable compact disk read-only memory (CD-ROM), digital Versatile Disks (DVD), memory sticks, floppy disks, mechanical coding devices, punch cards or in-groove structures such as punch cards or grooves having instructions stored thereon, and any suitable combination of the foregoing. Computer-readable storage media, as used herein, are not to be construed as transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., optical pulses through fiber optic cables), or electrical signals transmitted through wires.
The computer readable program instructions described herein may be downloaded from a computer readable storage medium to a respective computing/processing device or to an external computer or external storage device over a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmissions, wireless transmissions, routers, firewalls, switches, gateway computers and/or edge servers. The network interface card or network interface in each computing/processing device receives computer readable program instructions from the network and forwards the computer readable program instructions for storage in a computer readable storage medium in the respective computing/processing device.
Computer program instructions for performing the operations of the present disclosure can be assembly instructions, instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, c++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer readable program instructions may be executed entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, aspects of the present disclosure are implemented by personalizing electronic circuitry, such as programmable logic circuitry, field Programmable Gate Arrays (FPGAs), or Programmable Logic Arrays (PLAs), with state information of computer readable program instructions, which can execute the computer readable program instructions.
Various aspects of the present disclosure are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the disclosure. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-readable program instructions.
These computer readable program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer readable program instructions may also be stored in a computer readable storage medium that can direct a computer, programmable data processing apparatus, and/or other devices to function in a particular manner, such that the computer readable medium having the instructions stored therein includes an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.
The computer readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer, other programmable apparatus or other devices implement the functions/acts specified in the flowchart and/or block diagram block or blocks.
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (12)
1. The comprehensive energy system energy efficiency improvement analysis method based on the partial derivative of the structural parameter is characterized by comprising the following steps of:
the method comprises the following steps:
step 1: analyzing energy flow characteristics of each link of the comprehensive energy system, and establishing an expression of key structural parameters affecting energy efficiency levels of energy supply links and energy conversion links;
step 2: combining the energy utilization efficiency of the comprehensive energy system, and solving partial derivatives of the key structural parameters to obtain partial derivative expressions of the key structural parameters;
step 3: and analyzing the characteristics of partial derivative expressions of each key structural parameter, correspondingly increasing the configuration capacity of the gas turbine or the refrigerating equipment and the heating equipment, and improving the energy utilization efficiency of the comprehensive energy system.
2. The method for improving and analyzing the energy efficiency of the comprehensive energy system based on the partial derivative of the structural parameter according to claim 1, wherein the method comprises the following steps:
in the step 1, the key structural parameters affecting the energy efficiency level of the energy supply ring comprise renewable energy parameters, wherein the renewable energy parameters are the ratio SW 'of the renewable energy generated energy to the pure electric input of the energy transmission link after being converted into primary energy' 0 The expression is:
wherein sigma e The primary energy consumption conversion coefficient of outsourcing electricity is calculated;
SW′ re the energy generation amount is distributed energy;
E out,e the energy output of the conversion link.
3. The method for improving and analyzing the energy efficiency of the comprehensive energy system based on the partial derivative of the structural parameter according to claim 2, which is characterized in that:
in step 1, key structural parameters affecting the energy efficiency level of the energy conversion link include:
1) Gas energy conversion equipment proportion lambda B/CHP The expression is:
wherein G is B The natural gas consumption of the gas boiler is represented;
G CHP representing the amount of fuel consumed by the cogeneration plant, i.e., the gas turbine;
2) Ratio lambda of electric heating capacity to total heating capacity of system h The expression is:
wherein E is h The electric power consumption of the electric heating machine;
η COP,h is the electric heating efficiency;
E out,h the heat energy output of the conversion link;
3) Ratio lambda of electric refrigerating capacity to total refrigerating capacity of system c The expression is:
wherein E is c The power consumption of the electric refrigerator;
η COP,c is the efficiency of the absorption refrigerator;
E out,c is the cold energy output of the conversion link.
4. The method for improving and analyzing the energy efficiency of the comprehensive energy system based on the partial derivative of the structural parameter according to claim 3, wherein the method comprises the following steps:
in step 2, the energy utilization efficiency eta of the comprehensive energy system IES The expression of (2) is:
wherein lambda is c/e Is a cold and electrical structural parameter;
λ h/e is a thermal and electrical structural parameter;
Q E is the energy consumption proportion.
5. The method for improving and analyzing the energy efficiency of the comprehensive energy system based on the partial derivative of the structural parameter according to claim 4, wherein the method comprises the following steps:
cold and electrical structural parameter lambda c/e The method comprises the following steps:
wherein E is out,c The cold energy output of the energy conversion link is realized;
E out,e the electric energy output quantity of the conversion link;
thermal and electrical structural parameters lambda h/e The method comprises the following steps:
wherein E is out,h Is energy sourceThe heat energy output of the conversion link;
energy consumption ratio Q E The method comprises the following steps:
wherein C is G Is the natural gas energy coefficient;
G in natural gas demand is the comprehensive energy system;
E in the energy source system is used for outsourcing electricity.
6. The method for improving and analyzing the energy efficiency of the comprehensive energy system based on the partial derivative of the structural parameter according to claim 4, wherein the method comprises the following steps:
the partial derivative expression of the renewable energy parameters is:
7. the method for improving and analyzing the energy efficiency of the comprehensive energy system based on the partial derivative of the structural parameter according to claim 4, wherein the method comprises the following steps:
the partial derivative expression of the energy conversion equipment proportion is as follows:
wherein C is G Is the energy coefficient eta of natural gas CHP,h Heating efficiency eta of gas turbine B Efficiency of gas boiler, eta CHP,e Is the power generation efficiency of the gas turbine.
8. The method for improving and analyzing the energy efficiency of the comprehensive energy system based on the partial derivative of the structural parameter according to claim 4, wherein the method comprises the following steps:
λ c the partial derivative expression of (2) is:
wherein eta B Efficiency of gas boiler, eta COP,h For electric heating efficiency, C G Is the energy coefficient eta of natural gas COP,c For absorption chiller efficiency, eta CHP,h For the heating efficiency of the gas turbine, eta CHP,e The power generation efficiency of the cogeneration equipment.
9. The method for improving and analyzing the energy efficiency of the comprehensive energy system based on the partial derivative of the structural parameter according to claim 4, wherein the method comprises the following steps:
λ h the partial derivative expression of (2) is:
10. an integrated energy system energy efficiency promotion analysis system based on partial derivatives of structural parameters is characterized in that: the system is used for realizing the comprehensive energy system energy efficiency improvement analysis method based on the structural parameter partial derivative according to any one of claims 1-9, and specifically comprises the following steps:
the key structural parameter establishing module is used for analyzing the energy flow characteristics of each link of the comprehensive energy system and establishing an expression of key structural parameters affecting the energy efficiency level of the energy supply link and the energy conversion link;
the partial derivative calculation module is used for solving partial derivatives of the key structural parameters by combining the energy utilization efficiency of the comprehensive energy system to obtain partial derivative expressions of the key structural parameters;
the energy efficiency improvement analysis module is used for analyzing the characteristics of partial derivative expressions of each key structural parameter, correspondingly increasing the configuration capacity of the gas turbine or the refrigerating equipment and the heating equipment, and improving the energy utilization efficiency of the comprehensive energy system.
11. A terminal comprising a processor and a storage medium; the method is characterized in that:
the storage medium is used for storing instructions;
the processor is operative according to the instructions to perform the steps of the integrated energy system energy efficiency enhancement analysis method based on the partial derivatives of the structural parameters according to any one of claims 1-9.
12. A computer readable storage medium having stored thereon a computer program, characterized in that the program when executed by a processor realizes the steps of the integrated energy system energy efficiency improvement analysis method based on partial derivatives of structural parameters as claimed in any one of claims 1 to 9.
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