CN116822896A - Power transmission engineering full life cycle cost accounting method and system considering carbon cost - Google Patents
Power transmission engineering full life cycle cost accounting method and system considering carbon cost Download PDFInfo
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Abstract
The application relates to the technical field of electric power, in particular to a full life cycle cost accounting method and system for electric transmission engineering considering carbon cost. The application discloses a full life cycle cost accounting method of a power transmission project considering carbon cost, which comprises the following steps: calculating all full life cycle costs of the power transmission line based on the full life cycle cost model of the power transmission project; calculating carbon cost according to carbon dioxide emission generated by power transmission line loss; and taking the carbon cost into the total life cycle cost of the power transmission project, constructing a total life cycle cost model considering the carbon cost, and calculating. The application overcomes the contradiction of reliability in traditional evaluation or simply according to early investment or one-sided pursuit, embodies the principle of maximizing economic benefit, social benefit and environmental benefit, provides policy guidance for each business link of planning, material purchasing, engineering construction, operation maintenance and retirement of the power transmission line, and improves the scientificity and rationality of decision making.
Description
Technical Field
The application relates to the technical field of electric power, in particular to a full life cycle cost accounting method and system for electric transmission engineering considering carbon cost.
Background
In regard to the research on the whole life cycle management of the transmission line engineering, wang Likun (2021) introduces the whole life cycle cost management into the extra-high voltage transmission line cost management, applies relevant theory and calculation model to a certain extra-high voltage transmission line engineering for instance analysis, and indicates the important points in the management process by combining the characteristics and the implementation current situation of the whole life cycle cost, and proposes relevant optimization strategies. Yang Dong and the like (2020) optimize the operation cost, the maintenance cost and the fault cost calculation model in the total life cycle cost, adopt an improved gray GM (1, 1) prediction model for preventing the error from being too large in the fault rate prediction, and finally carry out maintenance cost benefit analysis and economic evaluation on the operation projects of insulator replacement and zero detection on the power transmission line in two maintenance modes. Zhang Yujiao and the like (2020) construct a power transmission line full life cycle cost evaluation model, and compare and analyze the technical economy of 3 energy-saving wires and conventional steel core aluminum stranded wires. Yang Junyong (2018) performs full life cycle analysis on the power transmission line, takes 110kV power transmission line construction projects in Laiwu areas as specific cases, and applies the full life cycle cost management concept and method to the planning and design stage of power transmission project engineering. Zhao Xiaofang, et al (2017) construct a cost control system combining transmission engineering construction with operation and maintenance, thereby determining an optimal full life cycle cost. And (5) establishing a total life cycle cost model of the ultra-high voltage transmission line by using the inert Yue Feng (2017), carrying out calculation example analysis by combining with actual engineering, and providing related conclusions and suggestions according to the calculation result and sensitivity analysis of the cost model of the ultra-high voltage transmission line. Liu Wei et al (2011) provide mathematical models for calculating the total life cycle cost of the transmission line, and select cases for demonstration analysis by combining with the fund time value theory.
While the current research suggests various optimization methods based on mature full life cycle cost management theory, carbon costs are less of a consideration for full life cycle costs. At present, the reform of the electric power system in China is further accelerated, and under the background of '3060 target' and the construction of a novel electric power system, value management and control tools of power grid engineering, full life cycle cost management concepts and the like are urgently needed to be further enhanced or optimized, so that the research of the full life cycle cost quantification method of the electric power transmission engineering considering carbon cost under the new situation is very significant.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the application and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description of the application and in the title of the application, which may not be used to limit the scope of the application.
The present application has been made in view of the above-described problems.
Therefore, the technical problems solved by the application are as follows: how to bring the carbon cost into the management of the whole life cycle cost of the power transmission line engineering, and propose corresponding optimization strategies and quantization methods to meet the requirements of power system reform and new power system construction under new situation.
In order to solve the technical problems, the application provides the following technical scheme: a full life cycle cost accounting method of a power transmission project considering carbon cost comprises the following steps:
calculating all full life cycle costs of the power transmission line based on the full life cycle cost model of the power transmission project;
calculating carbon cost according to carbon dioxide emission generated by power transmission line loss;
and taking the carbon cost into the total life cycle cost of the power transmission project, constructing a total life cycle cost model considering the carbon cost, and calculating.
As a preferable scheme of the power transmission engineering full life cycle cost accounting method considering carbon cost, the application comprises the following steps: the total life cycle cost of the power transmission project is the total cost generated in the whole period from planning and design to scrapping treatment of the power transmission project, and the total cost comprises initial investment cost, running cost, maintenance cost, fault loss and scrapping cost;
the initial investment cost consists of the material cost and the construction cost of the power transmission line, and the calculation formula is as follows:
IC＝CIF+ETF+COF+CF
the CIF is construction and installation engineering cost, the ETF is purchase cost of tools and tools, the COF is other engineering construction cost, and the CF is preparation cost.
As a preferable scheme of the power transmission engineering full life cycle cost accounting method considering carbon cost, the application comprises the following steps: the operation cost comprises loss of a power transmission line and daily inspection cost, and the calculation formula is as follows:
OC＝(ΔW max ×T 1 +P×l×8760)×p 1 +k×IC
wherein DeltaW is max The maximum load resistance power loss of the transmission line is kW, T 1 The unit is h, P is corona loss, kW/km, l is transmission line length, km, P 1 The real-time electricity price of the power transmission line is given by the unit of element/kWh, and k is the operation conversion coefficient of the power transmission line;
the transmission line loss comprises resistance loss and corona loss;
the calculation formula of the maximum resistance power loss is as follows:
ΔW max ＝I 2 R×10 -3
wherein DeltaW is max The power loss of the maximum load resistor is shown in kW, the maximum load current is shown in I, the total impedance of the circuit is shown in A and R, and the total impedance of the circuit is shown in omega;
wherein, the calculation formula of R is:
wherein R is the total resistance of the line, the unit is omega, n is the number of split polar wires, u is the direct current resistance of the wires when the wires are in maximum load current, the unit is omega/km, and l is the length of the transmission line, and the unit is km;
the empirical formula of corona loss in good weather of the unipolar direct current line is:
wherein P is 1 Corona loss of a monopole direct current circuit is in kW/km, U is the voltage to ground of a pole wire, and the units are kV and K c2 Taking the surface coefficient of the wire as 0.15-0.35, n as the number of split wires, r as the radius of sub-wires, and g as the unit cm max The maximum electric field intensity of the surface of the lead is expressed in units of kV/cm and g 0 Is the reference corona onset electric field strength g 0 =22 δ, unit kV/cm, δ is an atmospheric correction coefficient;
the corona loss empirical formula under good weather of the bipolar direct current circuit is:
wherein P is 2 Corona loss of a bipolar direct current circuit is shown in kW/km, H is the average height of a wire, s is the polar distance, and cm is the unit;
the corona loss formula of the alternating current circuit is as follows:
the charge density of the wire determined by Maxwell's equation is used to obtain the capacitance of each phase of the wire and the electric field intensity of the surface of the wire, so as to calculate corona loss;
wherein P is f 、P S 、P t Single phase corona loss in good weather, snow and rain, respectively, R eq For splitting the equivalent radius of the wire, E M For maximum electric field intensity on the surface of split conductor, n is the number of split conductors, r is the radius of conductor, E 0 The critical electric field strength is calculated by a Peak formula, m is the surface coefficient of a wire, and delta is the relative air density;
and the daily inspection cost adopts a transmission line maintenance coefficient k to carry out equal-ratio prediction, and the value of k is 1.4%.
As a preferable scheme of the power transmission engineering full life cycle cost accounting method considering carbon cost, the application comprises the following steps: the maintenance cost comprises maintenance cost and the assistance cost of other lines during power failure maintenance, and the calculation formula is expressed as:
wherein P is 1i The unit is the unit of manual reference unit price of the ith maintenance project of the power transmission line, n 1i C, annual average times of ith maintenance project of power transmission line 1i The number of personnel required for the ith maintenance project of the power transmission line at a single time, P 2i The unit is the unit of the material standard price of the ith maintenance project of the power transmission line, n 1i C, annual average times of ith maintenance project of power transmission line 2i For the single required material quantity of the ith maintenance project of the power transmission line, W i The power assisted by other standby lines in power outage overhaul of the ith overhaul project of the power transmission line is in the unit of kW and t i For the duration of the ith maintenance project of the power transmission line, p 1 The unit is Yuan/kWh for the unit of power unit of the transmission line.
As a preferable scheme of the power transmission engineering full life cycle cost accounting method considering carbon cost, the application comprises the following steps: the fault loss adopts an electricity generation ratio method to estimate the indirect loss cost, and a calculation formula is as follows:
FC＝(m+y)×λ 1 ×t 2 ×l×W l +P 3i ×λ 1 ×l
wherein m is the output value of unit electric quantity, unit is unit, y is unit electricity selling profit, lambda 1 Is the average failure rate of the power transmission line, and the unit is 10 -2 Sub/(km.a), t 2 For the average duration of each fault of the power transmission line, the unit is h, W l Is the power transmission capacity of the power transmission line, and the unit is kWh and P 3i The repair cost of the ith fault project of the power transmission line is given by the unit;
the scrapping cost is calculated by equipment estimation and depreciation rate, and the calculation formula is as follows:
DC＝γ 1 ×IC-γ 2 ×IC
wherein, gamma 1 For the abandoned rate of the transmission line, gamma 2 The recovery residual value rate of the power transmission line is considered according to 5% of the original value of the fixed asset.
As a preferable scheme of the power transmission engineering full life cycle cost accounting method considering carbon cost, the application comprises the following steps: the carbon cost is calculated by the following formula:
CC＝CE sh ×EF×P c
wherein CE is sh Is the carbon dioxide emission equivalent generated by the loss of the transmission line, EF is the carbon dioxide emission factor of the electric power, and P c Is a carbon trade unit price.
As a preferable scheme of the power transmission engineering full life cycle cost accounting method considering carbon cost, the application comprises the following steps: the full life cycle cost model considering carbon cost is expressed as:
LCC＝IC+OC+MC+FC+DC+CC
wherein LCC is full life cycle cost, IC is initial investment cost, OC is operation cost, MC is maintenance cost, FC is loss caused by faults, DC is scrapped cost, and CC is carbon cost.
Another object of the present application is to provide a total life cycle cost accounting system for power transmission engineering, which can solve the problems of power system reform and new power system construction requirements under new situation and how to overcome the contradiction between simple prior investment and one-sided pursuit of reliability in traditional evaluation by incorporating carbon cost into the management of total life cycle cost of power transmission engineering and providing corresponding optimization strategies and quantization methods.
In order to solve the technical problems, the application provides the following technical scheme: the utility model provides a transmission engineering full life cycle cost accounting system considering carbon cost, includes cost item determination module, cost calculation module, case analysis module, cost optimization module;
the cost item determination module is used for determining various cost items of the full Life Cycle Cost (LCC) of the power transmission project, including initial investment cost, operation cost, maintenance cost, fault loss, scrapping cost and carbon cost;
the cost calculation module is used for giving calculation formulas of various cost fees and calculating the total life cycle cost of the power transmission project, wherein the total life cycle cost comprises initial investment cost, operation cost, maintenance cost, fault loss, scrapping cost and carbon cost;
the case analysis module is used for carrying out case calculation analysis by combining with actual engineering so as to verify the effectiveness and practicality of the accounting method;
the cost optimization module is used for optimizing the total life cycle cost of the power transmission project according to the accounting result, and maximizing economic benefit, social benefit and environmental benefit.
A computer device comprising a memory and a processor, said memory storing a computer program, characterized in that the processor, when executing said computer program, implements the steps of a method for calculating the full life cycle cost of a power transmission project taking into account carbon costs.
A computer readable storage medium having stored thereon a computer program, characterized in that the computer program when executed by a processor implements the steps of a method for accounting for full life cycle costs of a power transmission project taking into account carbon costs.
The application has the beneficial effects that: according to the application, the carbon cost is integrated into the whole life cycle cost of the transmission line engineering, a multi-objective optimized whole life cycle cost model of the transmission and transformation engineering is formed, and case calculation and analysis are carried out by combining with the actual engineering, so that the practical value of the model is improved. The application overcomes the contradiction of reliability in traditional evaluation or simply according to early investment or one-sided pursuit, embodies the principle of maximizing economic benefit, social benefit and environmental benefit, provides policy guidance for each business link of planning, material purchasing, engineering construction, operation maintenance and retirement of the power transmission line, and improves the scientificity and rationality of decision making.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a flowchart of a method for accounting for full life cycle costs of a power transmission project, which takes carbon costs into account according to an embodiment of the present application;
FIG. 2 is a block diagram of a full life cycle cost accounting system for power transmission engineering that takes carbon costs into account according to one embodiment of the present application;
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present application can be understood in detail, a more particular description of the application, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present application is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the application. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
While the embodiments of the present application have been illustrated and described in detail in the drawings, the cross-sectional view of the device structure is not to scale in the general sense for ease of illustration, and the drawings are merely exemplary and should not be construed as limiting the scope of the application. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
Also in the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper, lower, inner and outer", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first, second, or third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected, and coupled" should be construed broadly in this disclosure unless otherwise specifically indicated and defined, such as: can be fixed connection, detachable connection or integral connection; it may also be a mechanical connection, an electrical connection, or a direct connection, or may be indirectly connected through an intermediate medium, or may be a communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
Example 1
Referring to fig. 1, for one embodiment of the present application, there is provided a full life cycle cost accounting method of power transmission engineering considering carbon costs, including:
calculating all full life cycle costs of the power transmission line based on the full life cycle cost model of the power transmission project;
calculating carbon cost according to carbon dioxide emission generated by power transmission line loss;
and taking the carbon cost into the total life cycle cost of the power transmission project, constructing a total life cycle cost model considering the carbon cost, and calculating.
S1: calculating all full life cycle costs of the power transmission line based on the full life cycle cost model of the power transmission project;
furthermore, the total life cycle cost of the power transmission project is the total cost generated in the whole period from planning and designing to scrapping treatment of the power transmission project, and the total cost comprises initial investment cost, running cost, maintenance cost, fault loss and scrapping cost;
the initial investment cost consists of the material cost and the construction cost of the power transmission line, and the calculation formula is as follows:
IC＝CIF+ETF+COF+CF
the CIF is construction and installation engineering cost, the ETF is purchase cost of tools and tools, the COF is other engineering construction cost, and the CF is preparation cost.
It should be noted that the initial Investment Costs (investments Costs) cover the sum of the Costs required for each stage of construction of the project, from the stage of investigation, the planning stage until the project is put into use, including project investigation, in-field exploration, planning design, construction, finished inspection, debugging before the equipment is put into use, etc.
Furthermore, the operation cost comprises the loss of the transmission line and the daily inspection cost, and the calculation formula is as follows:
OC＝(ΔW max ×T 1 +P×l×8760)×p 1 +k×IC
wherein DeltaW is max The maximum load resistance power loss of the transmission line is kW, T 1 The unit is h, P is corona loss, kW/km, l is transmission line length, km, P 1 The real-time electricity price of the power transmission line is given by the unit of element/kWh, and k is the operation conversion coefficient of the power transmission line;
it should be noted that, after the transmission line project is put into use, the Operation Costs (Operation Costs) refer to Costs generated by corresponding detection and maintenance measures for the transmission line in order to ensure safe and reliable Operation of the transmission line, and the Operation Costs are various, including purchase and installation Costs of the machine, employment and training Costs of technicians, environmental tax paid according to relevant laws and regulations, replacement Costs of damaged components, and the like.
The transmission line loss comprises resistance loss and corona loss;
it should be noted that the losses of the transmission line during operation include resistive losses and corona losses, wherein the resistive losses account for a relatively large proportion of the power losses of the transmission line, and the corona losses account for only less than 10% of the resistive losses, but because of their long lifetime (8760 hours if considered for normal operation throughout the year), the effect of resistive losses on economy cannot be neglected, the magnitude of the losses being mainly related to factors such as line length, wire selection, topography, maximum load current, maximum load loss hours, etc., wherein the wire selection mainly affects wire cross section, wire current density, wire resistance, etc.
The calculation formula of the maximum resistance power loss is as follows:
ΔW max ＝I 2 R×10 -3
wherein DeltaW is max The power loss of the maximum load resistor is shown in kW, the maximum load current is shown in I, the total impedance of the circuit is shown in A and R, and the total impedance of the circuit is shown in omega;
wherein, the calculation formula of R is:
wherein R is the total resistance of the line, the unit is omega, n is the number of split polar wires, u is the direct current resistance of the wires when the wires are in maximum load current, the unit is omega/km, and l is the length of the transmission line, and the unit is km;
the empirical formula of corona loss in good weather of the unipolar direct current line is:
wherein P is 1 Corona loss of a monopole direct current circuit is in kW/km, U is the voltage to ground of a pole wire, and the units are kV and K c2 Taking the surface coefficient of the wire as 0.15-0.35, n as the number of split wires, r as the radius of sub-wires, and g as the unit cm max The maximum electric field intensity of the surface of the lead is expressed in units of kV/cm and g 0 Is the reference corona onset electric field strength g 0 =22 δ, unit kV/cm, δ is an atmospheric correction coefficient;
the corona loss empirical formula under good weather of the bipolar direct current circuit is:
wherein P is 2 Corona loss of a bipolar direct current circuit is shown in kW/km, H is the average height of a wire, s is the polar distance, and cm is the unit;
it should be noted that the average height of the wires is the minimum distance +1/3 sag to ground.
The corona loss formula of the alternating current circuit is as follows:
the charge density of the wire determined by Maxwell's equation is used to obtain the capacitance of each phase of the wire and the electric field intensity of the surface of the wire, so as to calculate corona loss;
wherein P is f 、P S Pt is single phase corona loss in good weather, snow and rain, respectively, R eq For splitting the equivalent radius of the wire, E M For maximum electric field intensity on the surface of split conductor, n is the number of split conductors, r is the radius of conductor, E 0 The critical electric field strength is calculated by a Peak formula, m is the surface coefficient of a wire, and delta is the relative air density;
it should be noted that, the foreign dc line corona loss estimation formula mainly includes swedish An Naibao formula, italian formula, canadian IERQ formula, chinese electric science institute based on 6×900mm2 wire, test study is performed on the corona loss of dc line, the average value and maximum value prediction formula of the dc power transmission line corona loss for 6×900mm2 wire are obtained by fitting, the foreign corona loss calculation formula is evaluated by using the corona loss test data of the extra-high voltage dc test base, for the annual average corona loss in good weather, if a suitable wire surface roughness coefficient is selected, an Naibao formula and the corona loss test data of the extra-high voltage dc test line segment are the best, but if the wire surface roughness coefficient is not suitable, the error may be very large, the calculation value of canadian IREQ formula is about 2kW larger than the average loss of the extra-high voltage dc test line segment, but the comparison with the maximum value of the corona loss is good, the calculated value is 2-3kW smaller than the test data of the extra-high voltage dc test line segment, the average corona loss is not suitable for calculation, therefore, the error is calculated according to the sweburg patent, and the theoretical impact factor is obtained by analyzing according to the sweburg patent, according to the experiment coefficient, and the experiment coefficient is the experiment according to the experiment coefficient, and the experiment factor is 62 is obtained.
And the daily inspection cost adopts a transmission line maintenance coefficient k to carry out equal-ratio prediction, and the value of k is 1.4%.
It should be noted that the value of k is generally estimated according to the historical average condition or obtained by engineering experience according to construction cost conversion, the application adopts the power transmission line maintenance coefficient k to carry out equal ratio prediction, and refers to the technical rules of design of DL/T5429-2009-electric power system, and the value of k is 1.4%.
Further, the maintenance cost includes maintenance cost and the assistance cost of other lines during power failure maintenance, and the calculation formula is expressed as:
wherein P is 1i The unit is the unit of manual reference unit price of the ith maintenance project of the power transmission line, n 1i C, annual average times of ith maintenance project of power transmission line 1i The number of personnel required for the ith maintenance project of the power transmission line at a single time, P 2i The unit is the unit of the material standard price of the ith maintenance project of the power transmission line, n 1i C, annual average times of ith maintenance project of power transmission line 2i For the single required material quantity of the ith maintenance project of the power transmission line, W i The power assisted by other standby lines in power outage overhaul of the ith overhaul project of the power transmission line is in the unit of kW and t i For the duration of the ith maintenance project of the power transmission line, p 1 The unit is Yuan/kWh for the unit of power unit of the transmission line.
Furthermore, the fault loss adopts an electricity generation ratio method to estimate the indirect loss cost, and the calculation formula is as follows:
FC＝(m+y)×λ 1 ×t 2 ×l×W i +P 3i ×λ 1 ×l
wherein m is the output value of unit electric quantity, unit is unit, y is unit electricity selling profit, lambda 1 Is the average failure rate of the power transmission line, and the unit is 10 -2 Sub/(km.a), t 2 For the average duration of each fault of the power transmission line, the unit is h, W i Is the power transmission capacity of the power transmission line, and the unit is kWh and P 3i The repair cost of the ith fault project of the power transmission line is given by the unit;
it should be noted that, transmission line fault losses (fault Costs) mainly refer to economic losses generated by transmission line faults, including direct losses and indirect losses, where the direct losses are; loss of electric quantity profit due to failure; the factors involved in indirect loss are multiple, so accurate estimation is difficult, and the report adopts an electricity generation ratio method to estimate the cost of indirect loss.
The scrapping cost is calculated by equipment estimation and depreciation rate, and the calculation formula is as follows:
DC＝γ 1 ×IC-γ 2 ×IC
wherein, gamma 1 For the abandoned rate of the transmission line, gamma 2 The recovery residual value rate of the power transmission line is considered according to 5% of the original value of the fixed asset.
It should be noted that the Discard Costs (Discard Costs) refer to the fact that the equipment cannot maintain normal power transmission and distribution requirements, the efficiency of the power transmission line will be affected if the equipment is used continuously, and there is a high risk that the power transmission line and the power grid will be extremely threatened, so that the cost required for dismantling various facilities is added, besides, the facilities of the power transmission line cannot be used continuously, but still have a certain recovery value after being dismantled, the recovery benefits can be calculated as a part through equipment estimation and depreciation rate,
s2: calculating carbon cost according to carbon dioxide emission generated by power transmission line loss;
further, the carbon cost is calculated by the following formula:
CC＝CE sh ×EF×P c
wherein CE is sh Is the carbon dioxide emission equivalent generated by the loss of the transmission line, EF is the carbon dioxide emission factor of the electric power, and P c Is a carbon trade unit price.
It should be noted that, the carbon emission cost refers to carbon dioxide emission production cost generated in the process of construction of power transmission projects and power transmission, and the carbon footprint of the power transmission line under the full life cycle includes the following steps:
CE＝CE jz +CE yx +CE jx +CE Gz +CE bf
wherein CE is jz Carbon dioxide emission equivalent (tCO) of the transmission line construction link 2 e)，CE yx Carbon dioxide emission equivalent (tCO) of the operation link of the power transmission line 2 e) Including transmission loss and operation and maintenance, CE jx Is the dioxide of the overhauling link of the power transmission lineEquivalent carbon emission (tCO) 2 e)，CE gz Carbon dioxide emission equivalent (tCO) of transmission line fault link 2 e)，CE bf Carbon dioxide emission equivalent (tCO) of power transmission line retired scrapping link 2 e)。
However, based on the current statistical category, the data of a plurality of links cannot be obtained, and the patent aims to simplify the processing, and according to the 'accounting method and report guidelines for greenhouse gas emission of China grid enterprises', the carbon emission of the grid enterprises mainly comes from two aspects: firstly, the line loss generated by electric energy transmission is a main source of carbon emission of a power grid, and is also an important point of low-carbon transformation of power grid enterprises, secondly, sulfur hexafluoride generated by switch equipment such as a breaker, a current transformer and the like is mainly recovered and treated by constructing sulfur hexafluoride gas recovery and purification facilities at the present stage, fluoroketone mixed gas serving as a substitute is also being popularized in part of electric equipment, the capturing and sealing technology of the power grid on sulfur hexafluoride is more and more mature, and the carbon emission of the part is basically negligible, so the carbon emission of a power transmission line mainly considers the line loss generated by electric energy transmission.
S3: and taking the carbon cost into the total life cycle cost of the power transmission project, constructing a total life cycle cost model considering the carbon cost, and calculating.
Still further, the full lifecycle cost model that accounts for carbon costs is expressed as:
LCC＝IC+OC+MC+FC+DC+CC
wherein LCC is full life cycle cost, IC is initial investment cost, OC is operation cost, MC is maintenance cost, FC is loss caused by faults, DC is scrapped cost, and CC is carbon cost.
Example 2
A second embodiment of the application, which differs from the previous embodiment, is:
the functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Example 3
Referring to fig. 2, a third embodiment of the present application provides a system for accounting total life cycle cost of a power transmission project in consideration of carbon cost, which includes a cost item determining module, a cost calculating module, a case analyzing module, and a cost optimizing module;
the cost item determination module is used for determining various cost items of the full Life Cycle Cost (LCC) of the power transmission project, including initial investment cost, operation cost, maintenance cost, fault loss, scrapping cost and carbon cost;
the cost calculation module is used for giving calculation formulas of various cost fees and calculating the total life cycle cost of the power transmission project, wherein the total life cycle cost comprises initial investment cost, operation cost, maintenance cost, fault loss, scrapping cost and carbon cost;
the case analysis module is used for carrying out case calculation analysis by combining with actual engineering so as to verify the effectiveness and practicality of the accounting method;
the cost optimization module is used for optimizing the total life cycle cost of the power transmission project according to the accounting result, and maximizing economic benefit, social benefit and environmental benefit.
Example 4
In order to verify the beneficial effects of the application, the application carries out scientific demonstration through economic benefit calculation.
According to the application, a certain 500 kilovolt line is selected as a case, and the total life cycle cost accounting of the power transmission project considering the carbon cost is performed. The line is put into production in 2011, the overhead length is 150.888 km, the tower base number is 424, the wire types are 4X JLHA1/G1A400/50 and 4X JLHA1/G1A-400-54/7, and the maximum load utilization hours are 6412 hours.
Table 1 full lifecycle cost summary list of carbon costs for 500 kv line
According to calculation, the net current value of LCC (LCC) of a certain 500 kilovolt line is 449.32 ten thousand yuan/km, the social cost of LCC of a certain 500 kilovolt line is 4773.76 ten thousand yuan/km, and the carbon cost of LCC of a certain 500 kilovolt line is 212.23 ten thousand yuan/km.
It should be noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present application, which is intended to be covered by the scope of the claims of the present application.
Claims (10)
1. The utility model provides a transmission engineering full life cycle cost accounting method considering carbon cost, which is characterized by comprising the following steps:
calculating all full life cycle costs of the power transmission line based on the full life cycle cost model of the power transmission project;
calculating carbon cost according to carbon dioxide emission generated by power transmission line loss;
and taking the carbon cost into the total life cycle cost of the power transmission project, constructing a total life cycle cost model considering the carbon cost, and calculating.
2. The method for accounting the full life cycle cost of the power transmission project taking the carbon cost into consideration as claimed in claim 1, wherein the method comprises the following steps of: the total life cycle cost of the power transmission project is the total cost generated in the whole period from planning and design to scrapping treatment of the power transmission project, and the total cost comprises initial investment cost, running cost, maintenance cost, fault loss and scrapping cost;
the initial investment cost consists of the material cost and the construction cost of the power transmission line, and the calculation formula is as follows:
IC＝CIF+ETF+COF+CF
the CIF is construction and installation engineering cost, the ETF is purchase cost of tools and tools, the COF is other engineering construction cost, and the CF is preparation cost.
3. A method for accounting the full life cycle cost of a power transmission project taking into account carbon costs as defined in claim 2, wherein: the operation cost comprises loss of a power transmission line and daily inspection cost, and the calculation formula is as follows:
OC＝(ΔW max ×T 1 +P×l×8760)×p 1 +k×IC
wherein DeltaW is max The maximum load resistance power loss of the transmission line is kW, T 1 The unit is h, P is corona loss, kW/km, l is transmission line length, km, P 1 The real-time electricity price of the power transmission line is given by the unit of element/kWh, and k is the operation conversion coefficient of the power transmission line;
the transmission line loss comprises resistance loss and corona loss;
the calculation formula of the maximum resistance power loss is as follows:
ΔW max ＝I 2 R×10 -3
wherein DeltaW is max The power loss of the maximum load resistor is shown in kW, the maximum load current is shown in I, the total impedance of the circuit is shown in A and R, and the total impedance of the circuit is shown in omega;
wherein, the calculation formula of R is:
wherein R is the total resistance of the line, the unit is omega, n is the number of split polar wires, u is the direct current resistance of the wires when the wires are in maximum load current, the unit is omega/km, and l is the length of the transmission line, and the unit is km;
the empirical formula of corona loss in good weather of the unipolar direct current line is:
wherein P is 1 Corona loss of a monopole direct current circuit is in kW/km, U is the voltage to ground of a pole wire, and the units are kV and K c2 Is the surface coefficient of the wire, n is the number of split wires, r is the radius of the sub-wire, and the unit is cm, g max The maximum electric field intensity of the surface of the lead is expressed in kV/cm, h 0 Is the reference corona onset electric field strength g 0 =22 δ, unit kV/cm, δ is an atmospheric correction coefficient;
the corona loss empirical formula under good weather of the bipolar direct current circuit is:
wherein P is 2 Corona loss of a bipolar direct current circuit is shown in kW/km, H is the average height of a wire, s is the polar distance, and cm is the unit;
the corona loss formula of the alternating current circuit is as follows:
the charge density of the wire determined by Maxwell's equation is used to obtain the capacitance of each phase of the wire and the electric field intensity of the surface of the wire, so as to calculate corona loss;
wherein p is f 、p S 、p t Single phase corona loss in good weather, snow and rain, respectively, R eq For splitting the equivalent radius of the wire, E M For maximum electric field intensity on the surface of split conductor, n is the number of split conductors, r is the radius of conductor, E 0 The critical electric field strength is calculated by a Peak formula, m is the surface coefficient of a wire, and delta is the relative air density;
and the daily inspection cost adopts a transmission line maintenance coefficient k to carry out equal-ratio prediction, and the value of k is 1.4%.
4. A method of power transmission engineering full life cycle cost accounting for carbon costs as defined in claim 3, wherein: the maintenance cost comprises maintenance cost and the assistance cost of other lines during power failure maintenance, and the calculation formula is expressed as:
wherein P is 1i The unit is the unit of manual reference unit price of the ith maintenance project of the power transmission line, n 1i For the ith maintenance project of the power transmission lineNumber of times of annual average, c 1i The number of personnel required for the ith maintenance project of the power transmission line at a single time, P 2i The unit is the unit of the material standard price of the ith maintenance project of the power transmission line, n 1i C, annual average times of ith maintenance project of power transmission line 2i For the single required material quantity of the ith maintenance project of the power transmission line, W i The power assisted by other standby lines in power outage overhaul of the ith overhaul project of the power transmission line is in the unit of kW and t i For the duration of the ith maintenance project of the power transmission line, p 1 The unit is Yuan/kWh for the unit of power unit of the transmission line.
5. The method for calculating the total life cycle cost of the power transmission project by considering the carbon cost according to claim 4, wherein the fault loss adopts an electricity generation ratio method to estimate the indirect loss cost, and the calculation formula is as follows:
FC＝(m+y)×λ 1 ×t 2 ×l×W l +P 3i ×λ 1 ×l
wherein m is the output value of unit electric quantity, unit is unit, y is unit electricity selling profit, lambda 1 Is the average failure rate of the power transmission line, and the unit is 10 -2 Sub/(km.a), t 2 For the average duration of each fault of the power transmission line, the unit is h, W l Is the power transmission capacity of the power transmission line, and the unit is kWh and P 3i The repair cost of the ith fault project of the power transmission line is given by the unit;
the scrapping cost is calculated by equipment estimation and depreciation rate, and the calculation formula is as follows:
DC＝γ 1 ×IC-γ 2 ×IC
wherein, gamma 1 For the abandoned rate of the transmission line, gamma 2 The recovery residual value rate of the power transmission line is considered according to 5% of the original value of the fixed asset.
6. The method for accounting the full life cycle cost of the power transmission project considering the carbon cost according to claim 5, wherein the carbon cost is calculated by the following formula:
CC＝CE sh ×EF×P c
wherein CE is sh Is the carbon dioxide emission equivalent generated by the loss of the transmission line, EF is the carbon dioxide emission factor of the electric power, and P c Is a carbon trade unit price.
7. The method for accounting the full life cycle cost of the power transmission project considering the carbon cost as claimed in claim 6, wherein: the full life cycle cost model considering carbon cost is expressed as:
LCC＝IC+OC+MC+FC+DC+CC
wherein LCC is full life cycle cost, IC is initial investment cost, OC is operation cost, MC is maintenance cost, FC is loss caused by faults, DC is scrapped cost, and CC is carbon cost.
8. A system employing a full life cycle cost accounting method for power transmission engineering considering carbon costs according to any one of claims 1 to 7, characterized in that: the system comprises a cost item determining module, a cost calculating module, a case analyzing module and a cost optimizing module;
the cost item determining module is used for determining various cost items of the whole life cycle cost of the power transmission project, including initial investment cost, operation cost, maintenance cost, fault loss, scrapping cost and carbon cost;
the cost calculation module is used for giving calculation formulas of various cost fees and calculating the total life cycle cost of the power transmission project, wherein the total life cycle cost comprises initial investment cost, operation cost, maintenance cost, fault loss, scrapping cost and carbon cost;
the case analysis module is used for carrying out case calculation analysis by combining with actual engineering so as to verify the effectiveness and practicality of the accounting method;
the cost optimization module is used for optimizing the total life cycle cost of the power transmission project according to the accounting result, and maximizing economic benefit, social benefit and environmental benefit.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 7 when the computer program is executed.
10. A computer-readable storage medium having stored thereon a computer program, characterized by: the computer program implementing the steps of the method of any of claims 1 to 7 when executed by a processor.
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