CN109636167A - A kind of evaluation method of electric car charging and conversion electric facility access power distribution network - Google Patents
A kind of evaluation method of electric car charging and conversion electric facility access power distribution network Download PDFInfo
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Abstract
The present invention relates to a kind of evaluation methods of electric car charging and conversion electric facility access power distribution network comprising following steps: technical, economy, normalization, power quality, five class evaluation index of secondary system is arranged；The technical of setting, economy, normalization, power quality, five class evaluation index of secondary system are refined；Weight calculation evaluation is carried out to obtained refinement index, index is all made of hundred-mark system marking mode and is evaluated；According to index system and method, given a mark one by one to charging and conversion electric facility access power distribution network items evaluation index；According to obtained each index weights, final evaluation score value is calculated；It repeats the above steps, obtains the assessed value of each electric car charging and conversion electric facility access power distribution network scheme, the high expression program level of aggregation of assessed value is high.Evaluation conclusion is divided into " higher ", " medium " and " lower " three-level.The present invention can be widely applied to electric car charging and conversion electric facility access power distribution network evaluation field.
Description
Technical field
It is suitable more particularly to one kind the present invention relates to a kind of evaluation method of electric car charging and conversion electric facility access power distribution network
The evaluation method of 10 (20) kV and following power distribution network is accessed for electric car charging and conversion electric facility.
Background technique
Electric car is the revolutionary technology of clean energy resource substitution traditional energy, is given more sustained attention in the world.
At present, with the development of new energy technology and universal, electric car progresses into marketing application.It is changed with largely filling
Electric facility accesses power distribution network, project, side there has been no relevant appraisement system to electric car charging and conversion electric facility access power distribution network
Case carries out evaluation feedback, can not give the reference and constructive suggestion of related service directiveness.
Summary of the invention
In view of the above-mentioned problems, the object of the present invention is to provide a kind of evaluations of electric car charging and conversion electric facility access power distribution network
Method, the indexs such as technology, economy, normalization by accessing power distribution network to electric car charging and conversion electric facility are evaluated, are assessed
Its requirement for whether reaching the access of electric car charging and conversion electric facility provides evaluation and summarizes, and then forms a good feedback machine
System preferably instructs the access power distribution network work of electric car charging and conversion electric facility.
To achieve the above object, the present invention takes following technical scheme: a kind of electric car charging and conversion electric facility access distribution
The evaluation method of net comprising following steps: based on data, site inspection and the Data Analysis Results collected in advance, electricity is carried out
Electrical automobile charging and conversion electric facility accesses the evaluation of power distribution network, obtains commenting for each electric car charging and conversion electric facility access power distribution network scheme
Valuation；The assessed value that power distribution network scheme is accessed according to each electric car charging and conversion electric facility, obtains electric car charging and conversion electric facility and connects
Enter the evaluation result of power distribution network.
Further, described based on the data collected in advance, site inspection and Data Analysis Results, carry out electric car
The method that charging and conversion electric facility accesses the evaluation of power distribution network, comprising the following steps: technical, economy, normalization, electric energy are set
Quality, five class evaluation index of secondary system；To the technical of setting, economy, normalization, power quality, five class of secondary system
Evaluation index is refined to obtain the base values of all kinds of indexs and determines the scoring formula of each base values；Refer to for each basis
Mark setting evaluation weight；According to index system and method, to every base values of each charging and conversion electric facility access power distribution network scheme
It is given a mark one by one, and according to the evaluation weight of each base values, each charging and conversion electric facility access power distribution network scheme is calculated
Assessed value.
Further, the technical index include power supply voltage level, radius of electricity supply, reactive compensation, route type selecting,
Seven distribution transformer type selecting, access way, power supply mode base values；The economic index includes net present value (NPV), internal receipts
Three beneficial rate, investment payback time base values；The compliance index includes content intact degree, normalization, content depth three
Base values；The power quality index includes that harmonic wave, voltage deviation, four voltage unbalance factor, DC component bases refer to
Mark；The secondary system index includes three electrical energy measurement, system protection, system communication base values.
Further, in the technical index, the calculation formula of each base values scoring are as follows:
(a) power supply voltage level
When using 220V power supply voltage level:
When using 380V power supply voltage level:
When using 10kV power supply voltage level:
Wherein, y1Represent the scoring of power supply voltage level index, x1Represent charging and conversion electric facility load；
(b) radius of electricity supply
It is powered using 220V/380V:
Using 10kV line powering:
Wherein, y2Represent the scoring of radius of electricity supply index, x2Represent power supply line's length；
(c) reactive compensation
The reactive compensation of electrically-charging equipment access 10kV power grid:
The reactive compensation of non-on-board charger:
In formula, y3Represent the scoring of reactive compensation index, x3Represent the power factor of charging and conversion electric facility；
(d) calculation formula of the scoring of route type selecting route type selecting is as follows:
In formula, y4Represent the scoring of route type selecting index, x4Represent line load rate；
(e) distribution transformer type selecting distribution transformer type selecting is for reflecting distribution transformer load factor, the calculating of scoring
Formula is as follows:
In formula, y5Represent the scoring of route type selecting index, x5Represent distribution transformer load factor；
(f) calculation formula of access way scoring is as follows:
In formula, y6Represent the scoring of access way index, x6Represent charging and conversion electric facility machine utilization；
(g) power supply mode power supply mode is for determining whether second level responsible consumer uses double circuit power supply, the meter of scoring
It is as follows to calculate formula:
In formula, y7Represent the scoring of power supply mode index；
Further, the calculating of the scoring of each base values is specific as follows in the economic index:
(a) net present value (NPV)
The calculation formula of the scoring of net present value (NPV) is as follows:
In formula, y8Index of Net Present Value scoring is represented, NPV represents net present value (NPV), and calculation formula is as follows:
In formula, CI represents cash inflow；CO represents cash flow；(CI-CO)tRepresent the free cash flow of t phase
Amount；icRepresent base earnings ratio；N represents account period of project；
(b) internal rate of return (IRR)
The calculation formula of internal rate of return (IRR) scoring is as follows:
In formula, y9Represent the scoring of internal rate of return (IRR) index, icBase earnings ratio is represented, IPR represents the internal rate of return (IRR), calculates
Formula is as follows:
In formula, CI represents cash inflow；CO represents cash flow；(CI-CO)tRepresent the free cash flow of t phase
Amount；icRepresent base earnings ratio；N represents account period of project；
(c) investment payback time
The calculation formula of the scoring of investment payback time is as follows:
In formula, y10Represent the scoring of investment payback time index, TSRepresent expectation payoff period, PtThe investment payback time is represented, is calculated
Formula is as follows:
In formula, PtRepresent the investment payback time；TaRepresent the year number that accumulative total of net cash flow first appears positive value or zero；CI
Represent cash inflow；CO represents cash flow；(CI-CO)tRepresent the net cash flow of t phase.
Further, the calculation formula of the scoring of each base values is as follows in the power quality index:
(a) harmonic wave
The calculation formula of the scoring of harmonic wave is as follows:
In formula, y14Represent the scoring of harmonic wave index, x14Represent the quantity of state that harmonic wave is met the requirements；
(b) voltage deviation
The calculation formula of the scoring of voltage deviation is as follows:
In formula, y15Represent the scoring of voltage deviation index, x15Represent the quantity of state that voltage deviation is met the requirements；
(c) voltage unbalance factor
The calculation formula of the scoring of voltage unbalance factor is as follows:
In formula, y16Represent the scoring of voltage unbalance factor index, x16Represent the quantity of state that voltage unbalance factor is met the requirements；
(d) DC component
The calculation formula of the scoring of DC component is as follows:
In formula, y17Represent the scoring of DC component index, IDCThe DC component that electric charging is injected to power grid is represented,It represents
Its exchange definite value for injecting power grid.
Further, the calculating of the scoring of each base values is specific as follows in the secondary system index:
(a) electrical energy measurement
The calculation formula of the scoring of electrical energy measurement is as follows:
In formula, y18Represent the scoring of electrical energy measurement index, x18Represent the quantity of state of installation electric energy metering device；
(b) system protection
The calculation formula of the scoring of system protection is as follows:
In formula, y19The scoring of system of representatives blanket insurance finger shield mark, x19Represent the quantity of state of installation system protective device；
(c) system communication
The calculation formula of the scoring of system communication is as follows:
In formula, y20Represent the scoring of system singal reporting code, x20Represent mode used by system communication, wherein 3 representatives are adopted
Power line carrier communication mode is represented with wireless private network and the above communication mode, 4,5 represent wireless public network communication mode, and 6 represent
Without communication.
Further, the data collected in advance, site inspection and Data Analysis Results acquisition methods are as follows:
Data collection: the relevant design money of electric car charging and conversion electric facility access power distribution network project and charging and conversion electric facility is collected
Material checks and accepts data, operational data；
Site inspection: the installation and operation situation of access first and second equipment of power distribution network is verified；
Analysis: on the basis of data collection and site inspection, existing data is analyzed, determines first and second equipment fortune
Row reliability and accuracy.
Further, the assessed value that power distribution network scheme is accessed according to each electric car charging and conversion electric facility, obtains electronic
The method that automobile charging and conversion electric facility accesses the evaluation result of power distribution network are as follows:
Pass through the level of aggregation of assessed value height evaluation of programme first, evaluation conclusion is divided into three-level: score is 90~100
/ be " higher ", 70~90/be " medium ", 70 points it is below be " lower "；
Then judge whether to need to adjust according to evaluation result:
If evaluation conclusion is " lower ", weight after being adjusted to electric car charging and conversion electric facility access power distribution network scheme
New Appraisement, if evaluation result is " higher " or " medium ", evaluation terminates.
The invention adopts the above technical scheme, which has the following advantages: 1, of the invention from technical, economy, rule
Five plasticity, power quality, secondary system aspects amount to 20 indexs, access power distribution network to electric car charging and conversion electric facility
Scheme is evaluated, and objectivity, accuracy, comprehensive, comparativity, ethical rule are met.2, present invention employs levels
Analytic approach determines the weight of index, is evaluated using hundred-mark system marking mode, comments charging and conversion electric facility access power distribution network items
Valence index is given a mark one by one.It according to each index weights, obtains finally evaluating score value, be commented with this to carry out synthesis to the program
Estimate, evaluation result is more comprehensive.Therefore, the present invention can be widely applied to the access distribution on-Line review of electric car charging and conversion electric facility
Valence field.
Detailed description of the invention
Fig. 1 is the basic flow chart of electric car charging and conversion electric facility access power distribution network evaluation of the present invention.
Specific embodiment
The present invention is described in detail below with reference to the accompanying drawings and embodiments.
As shown in Figure 1, the present invention provides a kind of evaluation method of electric car charging and conversion electric facility access power distribution network, it should
Method includes data collection, site inspection, analysis, project appraisal, five part of evaluation conclusion.Specifically, including following step
It is rapid:
1) data collection: the relevant design of electric car charging and conversion electric facility access power distribution network project and charging and conversion electric facility is collected
Data checks and accepts data, operational data.
2) site inspection: the installation and operation situation of access first and second equipment of power distribution network is verified.If any special circumstances, need
It is additionally provided related data and situation explanation.
3) analysis: on the basis of data collection and site inspection, existing data is analyzed, determines first and second equipment
Operational reliability and accuracy.
4) project appraisal: data, site inspection and Data Analysis Results based on collection carry out electric car electric charging
Facility accesses the evaluation of power distribution network, obtains the assessed value of each electric car charging and conversion electric facility access power distribution network scheme.
5) evaluation conclusion: the assessed value of power distribution network scheme is accessed according to each electric car charging and conversion electric facility, obtains electronic vapour
The evaluation result of vehicle charging and conversion electric facility access power distribution network.
Above-mentioned steps 4) in, data, site inspection and Data Analysis Results based on collection, progress electric car, which fills, to be changed
The method of the evaluation of electric facility access power distribution network, comprising the following steps:
4.1) according to the influence after the access of electric car charging and conversion electric facility to power distribution network, technical, economy, rule are set
Plasticity, power quality, five class evaluation index of secondary system.
Wherein, technical index is for assessing power distribution network power supply mode and distribution net work structure comprising reflection power distribution network supplies
The base values of electric mode and distribution net work structure；Economic index is for assessing electric car charging and conversion electric facility access power distribution network
The situation of Profit of scheme and income time comprising reflect the base values of economic well-being of workers and staff；Compliance index is for assessment and electricity
The integrality and normalization of electrical automobile charging and conversion electric facility access power distribution network scheme related data comprising reflection electric car fills
Change the integrality and normative base values of electric facility access power distribution network scheme related data；Power quality index is for commenting
Estimate the index of power quality in power distribution network comprising the base values of power quality in reflection power distribution network；Secondary system index is used
In the standard of assessment system secondary device installation and the reasonability of system communication mode comprising reflection installation electrical energy measurement
The base values that mode used in the standard and system communication of device and system protective device selects.
4.2) the technical of step 4.1) setting, economy, normalization, power quality, the assessment of five class of secondary system are referred to
Mark refine and calculate each index.
1. technical index
Technical index includes power supply voltage level, radius of electricity supply, reactive compensation, route type selecting, distribution transformer choosing
Seven type, access way, power supply mode base values, the scoring calculation method of each base values are specific as follows:
(a) power supply voltage level
Power supply voltage level refers to the power supply voltage level of charging and conversion electric facility access power distribution network, the scoring y of different voltages grade1
Calculation formula it is as follows:
When using 220V power supply voltage level:
When using 380V power supply voltage level:
When using 10kV power supply voltage level:
In formula, x1Represent charging and conversion electric facility load.
(b) radius of electricity supply
Radius of electricity supply confession under directions electric line length, score y2Calculation formula it is as follows:
When being powered using 220V/380V:
Using 10kV line powering:
In formula, x2Represent power supply line's length.
(c) reactive compensation
Reactive compensation according to charging and conversion electric facility (if any reactive compensation, then for compensation after) power factor determine, scoring
y3Calculation formula it is as follows:
The reactive compensation of electrically-charging equipment access 10kV power grid:
The reactive compensation of non-on-board charger:
In formula, x3Represent charging and conversion electric facility (if any reactive compensation, then for compensation after) power factor.
(d) route type selecting
Route type selecting is for reflecting line load rate, and score y4Calculation formula it is as follows:
In formula, x4Represent line load rate.
(e) distribution transformer type selecting
Distribution transformer type selecting is for reflecting distribution transformer load factor, and score y5Calculation formula it is as follows:
In formula, x5Represent distribution transformer load factor.
(f) access way
Access way is commented for determining whether charging and conversion electric facility machine utilization meets more than 100kW using access is specially become
Divide y6Calculation formula it is as follows:
In formula, x6Represent charging and conversion electric facility machine utilization.
(g) power supply mode
Power supply mode is for determining whether second level responsible consumer uses double circuit power supply, and score y7Calculation formula such as
Under:
2. economic index
Economic index includes three net present value (NPV), the internal rate of return (IRR), investment payback time base values, each base values
Scoring calculation method it is specific as follows:
(a) net present value (NPV)
Net present value (NPV) is according to industry base earnings ratio that the net cash flow conversion in year each in account period of project is first to construction
The sum of present worth of phase.Economic evaluation for project, it is believed that net present value (NPV) is that the project of nonnegative number is feasible, and net present value (NPV) is got over
Greatly, it gets a profit bigger, score y8Calculation formula it is as follows:
In formula, NPV represents net present value (NPV), is obtained by following formula:
In formula, CI represents cash inflow；CO represents cash flow；(CI-CO)tRepresent the free cash flow of t phase
Amount；icRepresent base earnings ratio；N represents account period of project.
(b) internal rate of return (IRR)
The internal rate of return (IRR) refers to discount rate when project each year net cash flow present worth within the calculating phase adds up to be equal to zero, is to examine
Examine the main dynamic assessment index of project profitability.Economic evaluation for project, it is believed that the internal rate of return (IRR) is not less than benchmark
The project of earning rate is feasible, scoring y9Calculation formula it is as follows:
In formula, IPR represents the internal rate of return (IRR), icRepresent base earnings ratio.Internal rate of return (IRR) IPR is calculated by following formula:
In formula, CI represents cash inflow；CO represents cash flow；(CI-CO)tRepresent the free cash flow of t phase
Amount；icRepresent base earnings ratio；N represents account period of project.
(c) investment payback time
Investment payback time, which refers to, recycles the time required for project investment with the net profit of project, is to investigate project investment recycling
The important static evaluation index of ability, and preferably counted since the construction period.Economic evaluation for project, it is believed that investment recycling
Phase is feasible no more than the project of desired payoff period, and the investment payback time is shorter, shows that faster, wind resistance is recycled in project investment
Dangerous ability is stronger, and score y10Calculation formula it is as follows:
In formula, PtRepresent investment payback time, TSRepresent expectation payoff period.Investment payback time PtFor project investment cash flow
The time point that accumulative total of net cash flow is become zero by negative value in table, is calculated by following formula:
In formula, PtRepresent the investment payback time；TaRepresent the year number that accumulative total of net cash flow first appears positive value or zero；CI
Represent cash inflow；CO represents cash flow；(CI-CO)tRepresent the net cash flow of t phase.
3. compliance index
Compliance index includes three content intact degree, normalization, content depth base values, each base values
The calculation method that scores is specific as follows:
(a) content intact degree
Content intact degree is for reflecting offer data, the integrated degree of text, accuracy, and the calculation formula of scoring is such as
Under:
90~100 points to be outstanding, 60~80 be it is good, 60 points the following are unqualified.
(b) normative
Normalization is for determining whether to meet standard " electric car charging and conversion electric facility accesses electric power network technique specification " (Q/GDW
11178) it requires, the calculation formula of scoring is as follows:
90~100 points to be outstanding, 60~80 be it is good, 60 points the following are unqualified.
(c) content depth
Content depth is for determining whether access scheme content meets project overview, regional power grid develops, charging load is pre-
Survey, access scheme are required than the content depth of choosing, secondary system part, electrical energy measurement and billing scheme, case study, drawing,
The calculation formula that it scores is as follows:
90~100 points to be outstanding, 60~80 be it is good, 60 points the following are unqualified.
4. power quality index
Power quality index includes four harmonic wave, voltage deviation, voltage unbalance factor, DC component base values, each
The scoring calculation method of base values is specific as follows:
(a) harmonic wave
Harmonic wave is for determining whether harmonic wave meets national standard " power quality utility network harmonic wave " (GB/T 14549) and want
It asks, score y14Calculation formula it is as follows:
In formula, x14Represent the quantity of state that harmonic wave is met the requirements.
(b) voltage deviation
Voltage deviation is for determining whether the voltage deviation of points of common connection meets national standard " power quality supply voltage
Deviation " (GB 12325) requirement, score y15Calculation formula it is as follows:
In formula, x15Represent the quantity of state that voltage deviation is met the requirements.
(c) voltage unbalance factor
Voltage unbalance factor is for determining whether the voltage unbalance factor of points of common connection meets national standard " power quality
Imbalance of three-phase voltage " (GB 15543) requirement, score y16Calculation formula it is as follows:
In formula, x16Representative meets the quantity of state that voltage unbalance factor is met the requirements.
(d) DC component
DC component is used to determine whether the DC component to power grid injection to meet the requirements, and score y17Calculation formula such as
Under:
In formula, IDCThe DC component that electric charging is injected to power grid is represented,Represent its exchange definite value for injecting power grid.
5. secondary system index
Secondary system index includes three electrical energy measurement, system protection, system communication base values, each base values
Scoring calculation method it is specific as follows:
(a) electrical energy measurement
Electrical energy measurement is for determining whether to require installation electric energy metering device, and score y18Calculation formula it is as follows:
In formula, x18Represent the quantity of state of installation electric energy metering device.
(b) system protection
System protection is for determining whether installation system protective device, and score y19Calculation formula it is as follows:
In formula, x19Represent the quantity of state of installation system protective device.
(c) system communication
System communication is for judging mode used by system communication, and score y20Calculation formula it is as follows:
In formula, x20Represent mode used by system communication, wherein 3 represent using wireless private network and the above communication party
Formula, 4 represent power line carrier communication mode, and 5 represent wireless public network communication mode, and 6 represent without communication.
4.3) evaluation weight is set for the base values in step 4.2), as shown in the table:
1 electric car charging and conversion electric facility of table accesses power distribution network evaluation criterion weight and table is arranged
4.4) according to index system and method, every base values of each charging and conversion electric facility access power distribution network scheme is carried out
It gives a mark one by one, obtains the final scoring of each charging and conversion electric facility access power distribution network scheme.
4.5) according to each index weights of step 4.3) and final scoring, each electric car electric charging is calculated and sets
The assessed value for applying access power distribution network scheme, if " lower ", then after corresponding adjustment is evaluated system according to the actual situation, again
Evaluation；If " higher " or " medium ", then evaluation terminates.
Above-mentioned steps 5) in, the assessed value of power distribution network scheme is accessed according to each electric car charging and conversion electric facility, is evaluated
The method of conclusion are as follows: by the level of aggregation of assessed value height evaluation of programme, specific evaluation conclusion is as follows: evaluation conclusion is divided into
Three-level.Score 90~100/be " higher ", 70~90/be " medium ", it is " lower " that 70 points below.It is right
The scheme of evaluation result " higher ", analysis advantage are used；To the scheme of evaluation result " lower ", it should be directed in scheme and deposit
The problem of propose corrective measure.
The various embodiments described above are merely to illustrate the present invention, wherein the structure of each component, connection type and manufacture craft etc. are all
It can be varied, all equivalents and improvement carried out based on the technical solution of the present invention should not exclude
Except protection scope of the present invention.
Claims (9)
1. a kind of evaluation method of electric car charging and conversion electric facility access power distribution network, it is characterised in that the following steps are included:
Based on data, site inspection and the Data Analysis Results collected in advance, carries out electric car charging and conversion electric facility and access distribution
The evaluation of net obtains the assessed value of each electric car charging and conversion electric facility access power distribution network scheme；
The assessed value that power distribution network scheme is accessed according to each electric car charging and conversion electric facility obtains the access of electric car charging and conversion electric facility
The evaluation result of power distribution network.
2. a kind of evaluation method of electric car charging and conversion electric facility access power distribution network as described in claim 1, it is characterised in that:
It is described based on the data collected in advance, site inspection and Data Analysis Results, carry out electric car charging and conversion electric facility and access distribution
The method of the evaluation of net, comprising the following steps:
Technical, economy, normalization, power quality, five class evaluation index of secondary system are set；
The technical of setting, economy, normalization, power quality, five class evaluation index of secondary system are refined to obtain each
The base values of class index and the scoring formula for determining each base values；
For each base values, evaluation weight is set；
According to index system and method, every base values of each charging and conversion electric facility access power distribution network scheme is beaten one by one
Point, and according to the evaluation weight of each base values, the assessed value of each charging and conversion electric facility access power distribution network scheme is calculated.
3. a kind of evaluation method of electric car charging and conversion electric facility access power distribution network as claimed in claim 2, it is characterised in that:
The technical index includes power supply voltage level, radius of electricity supply, reactive compensation, route type selecting, distribution transformer type selecting, access
Seven mode, power supply mode base values；
The economic index includes three net present value (NPV), the internal rate of return (IRR), investment payback time base values；
The compliance index includes three content intact degree, normalization, content depth base values；
The power quality index includes four harmonic wave, voltage deviation, voltage unbalance factor, DC component base values；
The secondary system index includes three electrical energy measurement, system protection, system communication base values.
4. a kind of evaluation method of electric car charging and conversion electric facility access power distribution network as claimed in claim 3, it is characterised in that:
In the technical index, the calculation formula of each base values scoring are as follows:
(a) power supply voltage level
When using 220V power supply voltage level:
When using 380V power supply voltage level:
When using 10kV power supply voltage level:
Wherein, y1Represent the scoring of power supply voltage level index, x1Represent charging and conversion electric facility load；
(b) radius of electricity supply
It is powered using 220V/380V:
Using 10kV line powering:
Wherein, y2Represent the scoring of radius of electricity supply index, x2Represent power supply line's length；
(c) reactive compensation
The reactive compensation of electrically-charging equipment access 10kV power grid:
The reactive compensation of non-on-board charger:
In formula, y3Represent the scoring of reactive compensation index, x3Represent the power factor of charging and conversion electric facility；
(d) route type selecting
The calculation formula of the scoring of route type selecting is as follows:
In formula, y4Represent the scoring of route type selecting index, x4Represent line load rate；
(e) distribution transformer type selecting
Distribution transformer type selecting is as follows for reflecting distribution transformer load factor, the calculation formula of scoring:
In formula, y5Represent the scoring of route type selecting index, x5Represent distribution transformer load factor；
(f) access way
The calculation formula of scoring is as follows:
In formula, y6Represent the scoring of access way index, x6Represent charging and conversion electric facility machine utilization；
(g) power supply mode
For power supply mode for determining whether second level responsible consumer uses double circuit power supply, the calculation formula of scoring is as follows:
In formula, y7Represent the scoring of power supply mode index.
5. a kind of evaluation method of electric car charging and conversion electric facility access power distribution network as claimed in claim 3, it is characterised in that:
The calculating of the scoring of each base values is specific as follows in the economic index:
(a) net present value (NPV)
The calculation formula of the scoring of net present value (NPV) is as follows:
In formula, y8Index of Net Present Value scoring is represented, NPV represents net present value (NPV), and calculation formula is as follows:
In formula, CI represents cash inflow；CO represents cash flow；(CI-CO)tRepresent the net cash flow of t phase；icGeneration
Table base earnings ratio；N represents account period of project；
(b) internal rate of return (IRR)
The calculation formula of internal rate of return (IRR) scoring is as follows:
In formula, y9Represent the scoring of internal rate of return (IRR) index, icBase earnings ratio is represented, IPR represents the internal rate of return (IRR), calculation formula
It is as follows:
In formula, CI represents cash inflow；CO represents cash flow；(CI-CO)tRepresent the net cash flow of t phase；icGeneration
Table base earnings ratio；N represents account period of project；
(c) investment payback time
The calculation formula of the scoring of investment payback time is as follows:
In formula, y10Represent the scoring of investment payback time index, TSRepresent expectation payoff period, PtThe investment payback time is represented, calculation formula is such as
Under:
In formula, PtRepresent the investment payback time；TaRepresent the year number that accumulative total of net cash flow first appears positive value or zero；CI is represented
Cash inflow；CO represents cash flow；(CI-CO)tRepresent the net cash flow of t phase.
6. a kind of evaluation method of electric car charging and conversion electric facility access power distribution network as claimed in claim 3, it is characterised in that:
The calculation formula of the scoring of each base values is as follows in the power quality index:
(a) harmonic wave
The calculation formula of the scoring of harmonic wave is as follows:
In formula, y14Represent the scoring of harmonic wave index, x14Represent the quantity of state that harmonic wave is met the requirements；
(b) voltage deviation
The calculation formula of the scoring of voltage deviation is as follows:
In formula, y15Represent the scoring of voltage deviation index, x15Represent the quantity of state that voltage deviation is met the requirements；
(c) voltage unbalance factor
The calculation formula of the scoring of voltage unbalance factor is as follows:
In formula, y16Represent the scoring of voltage unbalance factor index, x16Represent the quantity of state that voltage unbalance factor is met the requirements；
(d) DC component
The calculation formula of the scoring of DC component is as follows:
In formula, y17Represent the scoring of DC component index, IDCThe DC component that electric charging is injected to power grid is represented,Represent its note
Enter the exchange definite value of power grid.
7. a kind of evaluation method of electric car charging and conversion electric facility access power distribution network as claimed in claim 3, it is characterised in that:
The calculating of the scoring of each base values is specific as follows in the secondary system index:
(a) electrical energy measurement
The calculation formula of the scoring of electrical energy measurement is as follows:
In formula, y18Represent the scoring of electrical energy measurement index, x18Represent the quantity of state of installation electric energy metering device；
(b) system protection
The calculation formula of the scoring of system protection is as follows:
In formula, y19The scoring of system of representatives blanket insurance finger shield mark, x19Represent the quantity of state of installation system protective device；
(c) system communication
The calculation formula of the scoring of system communication is as follows:
In formula, y20Represent the scoring of system singal reporting code, x20Represent mode used by system communication, wherein 3 represent using wireless
Private network and the above communication mode, 4 represent power line carrier communication mode, and 5 represent wireless public network communication mode, and 6 represent without communication.
8. a kind of evaluation method of electric car charging and conversion electric facility access power distribution network as described in claim 1, it is characterised in that:
The data collected in advance, site inspection and Data Analysis Results acquisition methods are as follows:
Data collection: the relevant design data of collection electric car charging and conversion electric facility access power distribution network project and charging and conversion electric facility,
Examination data, operational data；
Site inspection: the installation and operation situation of access first and second equipment of power distribution network is verified；
Analysis: on the basis of data collection and site inspection, analyzing existing data, determines that the operation of first and second equipment can
By property and accuracy.
9. a kind of evaluation method of electric car charging and conversion electric facility access power distribution network as described in claim 1, it is characterised in that:
The assessed value that power distribution network scheme is accessed according to each electric car charging and conversion electric facility obtains the access of electric car charging and conversion electric facility
The method of the evaluation result of power distribution network are as follows:
First by the level of aggregation of assessed value height evaluation of programme, evaluation conclusion is divided into three-level: score 90~100/
Between be " higher ", 70~90/be " medium ", 70 points it is below be " lower "；
Then judge whether to need to adjust according to evaluation result:
If evaluation conclusion is " lower ", commented again after being adjusted to electric car charging and conversion electric facility access power distribution network scheme
Valence, if evaluation result is " higher " or " medium ", evaluation terminates.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112132393A (en) * | 2019-11-25 | 2020-12-25 | 深圳供电局有限公司 | Charging station quantization system |
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| CN113313403A (en) * | 2021-06-15 | 2021-08-27 | 国网安徽省电力有限公司经济技术研究院 | Power distribution network comprehensive evaluation method, device and system based on large-scale high-power electric vehicle charging and discharging and storage medium |
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Application publication date: 20190416 |