CN105956931A - Power distribution line dynamic capacity increasing auxiliary decision making method and system - Google Patents
Power distribution line dynamic capacity increasing auxiliary decision making method and system Download PDFInfo
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Abstract
The invention discloses a power distribution line dynamic capacity increasing auxiliary decision making method and system. The method comprises the following steps of: S1, obtaining real-time monitoring data including operation parameters and microclimate parameters of a power distribution line, and through a communication network, transmitting the monitored data in a standard format back to an auxiliary decision making platform for the use of analysis and decision making; S2, establishing a power distribution wire thermal circuit transient model according to the monitored data, calculating a maximum allowable current when the temperature of a wire reaches 70 DEG C at a measurement moment, and further deriving out the size of the increasable capacity of the line; S3, according to the obtained maximum allowable current, carrying out dynamic capacity increasing, judging whether the voltage on the tail end of the line decreases to the value lower than a standard requirement, and if yes, reducing the voltage drop; and S4, carrying out effect evaluation according to a financial net present value analysis method in engineering economics. According to the invention, the potential conveying capacity of the power distribution line is fully excavated, and the unnecessary investment wastes such as wire exchange are reduced.
Description
Technical field
The present invention relates to power distribution network O&M renovation technique field, particularly relate to a kind of distribution line dynamic compatibilization auxiliary
Help decision method and system.
Background technology
In recent years, along with the quickening of power end pace of construction and the growth of load side electricity consumption and multiformity, distribution
The problem that planning construction is delayed and ability to transmit electricity is not enough becomes increasingly conspicuous, have that wiring is unreasonable, radius of electricity supply length,
The problems such as power supply quality is poor, line loss is high, power distribution network peak-valley difference is bigger.According to existing current carrying capacity of conductor
It is all the economic current-carrying capacity under the harsh conditions of+70 DEG C, but because of the running environment difference of wire and thermal effect
Answering difference very big, especially to year-round average temperature lower ground district, the actual max load amount of wire has the biggest
Room for promotion.
For existing distribution network line increase-volume problem, need a kind of method, it is possible to ensureing that circuit runs safety
Property ensure on the premise of, according to run climatic environment practical situation, use the online temperature of line conductor, environment
The Monitoring Data of temperature, wind speed, sunshine and current-carrying capacity etc., fills part and excavates circuit compatibilization ability, and combine increasing
The corresponding controller switching equipment (such as adjustable transformer, reactive power compensator etc.) added, to ensure terminal voltage quality
Etc. scheme.The method finally using financial net present value carries out economic evaluation to scheme, fully excavates to arrive
While the transmission capacity that distribution line is potential, and reduce the unnecessary investment waste such as restringing.
Summary of the invention
The technical problem to be solved in the present invention is and transmission of electricity delayed for distribution planning construction in prior art
The defect of scarce capacity, it is provided that a kind of according to running climatic environment practical situation, fills part and excavates circuit increase-volume energy
The distribution line dynamic compatibilization aid decision-making method of power and system.
The technical solution adopted for the present invention to solve the technical problems is:
The present invention provides a kind of distribution line dynamic compatibilization aid decision-making method, comprises the following steps:
S1, the Real-time Monitoring Data of acquisition distribution line, including operational factor and microclimate parameter, and pass through
The data monitored are sent back Decision Platform by communication network in a standardized format, make for analysis decision
With；
S2, set up distribution wire hot road transient Model according to Monitoring Data, and calculate moment conductor temperature to be measured
Maximum allowed current when reaching 70 degree, and then derivation circuit can increase the size of capacity；
S3, carry out dynamic compatibilization according to the maximum allowed current that obtains, and under judging that line end voltage is whether
It is brought down below the requirement of standard, if less than standard, reducing voltage drop；
S4, carry out recruitment evaluation according to the method for financial net present value analysis in engineering economy.
Further, in step S1 of the present invention, operational factor includes conductor temperature, current in wire；Micro-gas
As parameter includes ambient temperature, humidity, wind direction, wind speed, air pressure and intensity of sunshine.
Further, in step S1 of the present invention, communication network uses GPRS/3G/4G.
Further, in step S2 of the present invention, the computing formula of maximum allowed current is:
Wherein, θcFor aerial condutor temperature, Rc(θc) it is that aerial condutor is at θcAt a temperature of self thermal resistance, θeLead
Line place ambient temperature, RxFor the environment thermal resistance between wire to monitoring point.
Further, the formula calculating ambient heat resistance in step S2 of the present invention is:
Wherein, θcFor aerial condutor temperature, θeWire place ambient temperature, CxFor steel-cored aluminium strand steel
Core thermal capacitance Cx1Thermal capacitance C with steel core aluminum stranded conductor aluminiumx2Sum, WC=I2Rc(θc) it is wire self-heating amount.
Further, the method reducing voltage drop in step S3 of the present invention includes: by there being the load can modulation
Depressor improves source voltage terminal, takes series compensation to reduce line reactance, compensates reduction circuit in parallel idle
Transmission.
Further, step S4 of the present invention carries out the method for recruitment evaluation particularly as follows:
Calculate the electricity charge income after increasing capacity and reforming equipment expense, labour cost, line loss expense and dimension
Protect the difference of expense, be denoted as financial net present value, compare the financial net present value before and after dynamic compatibilization, select clean existing
It is worth bigger scheme as economically viable scheme.
The present invention provides a kind of distribution line dynamic compatibilization aid decision-making system, including:
Monitoring Data access unit, for obtaining the Real-time Monitoring Data of distribution line, including operational factor and
Microclimate parameter, and by communication network, the data monitored are sent back aid decision in a standardized format
Platform, for analysis decision；
The thermally-stabilised online check unit of circuit, for setting up distribution wire hot road transient state mould according to Monitoring Data
Type, and calculate maximum allowed current when moment conductor temperature to be measured reaches 70 degree, and then derivation circuit can
Increase the size of capacity；
Low-voltage is analyzed and governance unit, for carrying out dynamic compatibilization according to the maximum allowed current obtained, and
Judge whether line end voltage is decreased below the requirement of standard, if less than standard, reducing voltage drop；
Recruitment evaluation unit, comments for carrying out effect according to the method for financial net present value analysis in engineering economy
Estimate.
The beneficial effect comprise that: the distribution line dynamic compatibilization aid decision-making method of the present invention,
On the premise of ensureing that circuit safety in operation ensures, according to running climatic environment practical situation, circuit is used to lead
The Monitoring Data of the online temperature of line, ambient temperature, wind speed, sunshine and current-carrying capacity etc., fills part and excavates circuit increasing
Appearance ability, and propose by increasing corresponding controller switching equipment (such as adjustable transformer, reactive power compensator etc.),
To ensure the schemes such as terminal voltage quality, finally use the method for financial net present value that scheme is carried out economy and comment
Estimating, while arriving and fully excavating the transmission capacity that distribution line is potential, and it is unnecessary to reduce restringing etc.
Investment waste.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the flow chart of the distribution line dynamic compatibilization aid decision-making method of the embodiment of the present invention；
Fig. 2 is the system block diagram of the distribution line dynamic compatibilization aid decision-making method of the embodiment of the present invention；
Fig. 3 is the consideration conductor temperature of the distribution line dynamic compatibilization aid decision-making method of the embodiment of the present invention
Wire Transient Thermal Circuit model with ambient temperature；
Fig. 4 is that having of the distribution line dynamic compatibilization aid decision-making method of the embodiment of the present invention carries adjustable transformation
Device pressure regulation gear schematic diagram calculation；
Fig. 5 is that the capacitor series connection of the distribution line dynamic compatibilization aid decision-making method of the embodiment of the present invention is mended
Repay schematic diagram；
Fig. 6 is that the capacitor parallel connection of the distribution line dynamic compatibilization aid decision-making method of the embodiment of the present invention is mended
Repay schematic diagram；
Fig. 7 is the theory diagram of the distribution line dynamic compatibilization aid decision-making system of the embodiment of the present invention.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and reality
Execute example, the present invention is further elaborated.Only should be appreciated that specific embodiment described herein
In order to explain the present invention, it is not intended to limit the present invention.
As it is shown in figure 1, the distribution line dynamic compatibilization aid decision-making method of the embodiment of the present invention, including following
Step:
S1, the Real-time Monitoring Data of acquisition distribution line, including operational factor and microclimate parameter, and pass through
The data monitored are sent back Decision Platform by communication network in a standardized format, make for analysis decision
With；
S2, set up distribution wire hot road transient Model according to Monitoring Data, and calculate moment conductor temperature to be measured
Maximum allowed current when reaching 70 degree, and then derivation circuit can increase the size of capacity；
S3, carry out dynamic compatibilization according to the maximum allowed current that obtains, and under judging that line end voltage is whether
It is brought down below the requirement of standard, if less than standard, reducing voltage drop；
S4, carry out recruitment evaluation according to the method for financial net present value analysis in engineering economy.
As in figure 2 it is shown, in another specific embodiment of the present invention, according to distribution line operational factor,
The multidimensional datas such as ambient parameter, it is achieved distribution line increase-volume decision scheme optimization, replace and take to change transmission of electricity
The means that wire or newly-built distribution line etc. are single, extensive, promote asset utilization ratio.It concretely comprises the following steps:
(1) Monitoring Data accesses.Monitoring device is monitored in real time operational factor and the microclimate of distribution line
Data, send back Decision Platform by GPRS/3G/4G communication network, make for module analysis decision-making below
With.
Monitoring Data is broadly divided into two classes: a class is the operational factor of distribution line, including conductor temperature, leads
Line current；Another kind of is microclimate parameter, including ambient temperature, humidity, wind direction, wind speed, air pressure and day
According to intensity.
(2) the thermally-stabilised online check of circuit.As it is shown on figure 3, set up distribution wire according to heat transfer theory
Hot road transient Model, first with monitoring current in wire, conductor temperature, ambient temperature and line in this model
Road AC resistance, use formula calculated as below calculate the moment to be measured environment thermal resistance:
In formula, θcFor aerial condutor temperature；θeWire place ambient temperature；CxFor steel-cored aluminium strand steel
Core thermal capacitance Cx1Thermal capacitance C with steel core aluminum stranded conductor aluminiumx2Sum；WC=I2Rc(θc) it is wire self-heating amount.I is
Current carrying capacity of conductor；Cx=Cx1+Cx2, wherein Cx1=Cgρgsglg, Cg, ρg、sg、lgIt is respectively the ratio of steel core
Thermal capacitance, density, actual cross-sectional area, length, thermal capacitance C of aluminumx2Identical with steel core computational methods, take it
Corresponding parameter carries out calculating.
Recycling Monitoring Data conductor temperature, ambient temperature, environment thermal resistance, use specific calculation formula to calculate
Moment conductor temperature to be measured reaches maximum allowed current when 70 degree, such that it is able to derivation circuit can increase appearance
The size of amount, provides for dynamic compatibilization and supports.The formula calculating maximum allowed current is:
In formula, θcFor aerial condutor temperature；Rc(θc) it is that aerial condutor is at θcAt a temperature of self thermal resistance；θeLead
Line place ambient temperature.RxFor the environment thermal resistance between wire to monitoring point.
(3) low-voltage analysis and improvement.When line transmission power rise, cause under line end voltage
Fall, may result in substandard requirement, according to voltage drop formula, can take load adjustable transformer time serious
Improve source voltage terminal, take series compensation to reduce line reactance X, compensate in parallel and reduce the idle Q of circuit
Transmission, thus reduce the purpose of voltage drop.
3.1, pressure regulator tap system of selection: as shown in Figure 4, voltage drop Δ VTFormula be:
RT+jXTFor the impedance of reduction to high voltage side of transformer, V1 is high side voltage.
Obtain high-pressure side tap voltage V1t:
V2NFor low-pressure side rated voltage.
Thus select corresponding pressure regulator gear, but to manual voltage regulation, it is necessary to calculate peak load and
Under little, tap to be selected, then averages.
3.2, series compensation capacitor capacitor value system of selection: as it is shown in figure 5, need the capacitor compensated
Capacitor value XC, formula is:
ΔVcFor the line electricity pressure drop after series compensation capacitance
3.3, shunt compensation pressure regulation Capacity Selection method: as shown in Figure 6, needs the appearance of the capacitor compensated
Amount QC, formula is:
Wherein, V '2For reduction on high-tension side electric substation low-voltage bus bar voltage, V2cFor compensated rear electric substation
The virtual voltage that low-pressure side pressure ball keeps.But should be noted the cooperation between pressure regulator, principle is at satisfied tune
In the case of pressure request, make reactive compensation capacity minimum.
(4) recruitment evaluation
Assessment increase-volume scheme uses the method that in engineering economy, financial net present value is analyzed, by technical scheme whole
Cash flow conversion (consider inflation and interest) in the individual given period to technical scheme come into effect time present worth
Sum.And carry out financial net present value with restringing and newly-built circuit and compare, financial net present value is the best relatively greatly,
Select economically viable scheme.
Financial net present value (FNPV)=cash inflow present worth sum-cash outflow present worth sum
Cash inflow present worth sum mainly increases the electricity charge income after capacity
Cash outflow present worth sum is mainly reforming equipment expense, labour cost, line loss expense and maintenance expense
With.
Certain 10kV circuit, power transmission capacity of pow 8000kVA before transformation, transformation correlative charges is as shown in the table,
By current bank loan benchmark interest rate 3%, 0.2 yuan/kWH of electricity charge income (deduction line loss) calculates, it is considered to
To the Wave crest and wave trough effect of electricity consumption, if with electrostrictive coefficient 0.4.
| Scheme one: capacity-increasing transformation | Scheme two: newly-built circuit | |
| Installation cost (ten thousand yuan) | 45 | 115 |
| Labour cost (ten thousand yuan) | 5.5 | 15 |
| Maintenance cost (ten thousand yuan) | 10 | 10 |
| Transmission line capability promotes | 20% | 25% |
Financial net present value in calculating 5 years is as follows:
Scheme one: FNPV=0.4*8000*20%*0.2* (1-1.035)/(1-1.03)*8760*5-(45+5.5+10)
=237.15 ten thousand yuan
Scheme two: FNPV=0.4*8000*25%*0.25* (1-1.035)/(1-1.03)*8760*5-(115+15+10)
=232.06 ten thousand yuan
It can be seen that use the capacity-increasing transformation of scheme one, while meeting user's request, preferable warp can be obtained
Ji effect.
As it is shown in fig. 7, the distribution line dynamic compatibilization aid decision-making system of the embodiment of the present invention, including:
Monitoring Data access unit, for obtaining the Real-time Monitoring Data of distribution line, including operational factor and
Microclimate parameter, and by communication network, the data monitored are sent back aid decision in a standardized format
Platform, for analysis decision；
The thermally-stabilised online check unit of circuit, for setting up distribution wire hot road transient state mould according to Monitoring Data
Type, and calculate maximum allowed current when moment conductor temperature to be measured reaches 70 degree, and then derivation circuit can
Increase the size of capacity；
Low-voltage is analyzed and governance unit, for carrying out dynamic compatibilization according to the maximum allowed current obtained, and
Judge whether line end voltage is decreased below the requirement of standard, if less than standard, reducing voltage drop；
Recruitment evaluation unit, comments for carrying out effect according to the method for financial net present value analysis in engineering economy
Estimate.
It should be appreciated that for those of ordinary skills, can be improved according to the above description
Or conversion, and all these modifications and variations all should belong to the protection domain of claims of the present invention.
Claims (8)
1. a distribution line dynamic compatibilization aid decision-making method, it is characterised in that comprise the following steps:
S1, the Real-time Monitoring Data of acquisition distribution line, including operational factor and microclimate parameter, and lead to
Cross communication network and the data monitored are sent back Decision Platform in a standardized format, for analyzing certainly
Plan uses；
S2, set up distribution wire hot road transient Model according to Monitoring Data, and calculate moment wire temperature to be measured
Degree reaches maximum allowed current when 70 degree, and then derivation circuit can increase the size of capacity；
The maximum allowed current that S3, basis obtain carries out dynamic compatibilization, and whether judges line end voltage
It is decreased below the requirement of standard, if less than standard, reducing voltage drop；
S4, carry out recruitment evaluation according to the method for financial net present value analysis in engineering economy.
Distribution line dynamic compatibilization aid decision-making method the most according to claim 1, it is characterised in that
In step S1, operational factor includes conductor temperature, current in wire；Microclimate parameter includes ambient temperature, wet
Degree, wind direction, wind speed, air pressure and intensity of sunshine.
Distribution line dynamic compatibilization aid decision-making method the most according to claim 1, it is characterised in that
In step S1, communication network uses GPRS/3G/4G.
Distribution line dynamic compatibilization aid decision-making method the most according to claim 1, it is characterised in that
In step S2, the computing formula of maximum allowed current is:
Wherein, θcFor aerial condutor temperature, Rc(θc) it is that aerial condutor is at θcAt a temperature of self thermal resistance, θeLead
Line place ambient temperature, RxFor the environment thermal resistance between wire to monitoring point.
Distribution line dynamic compatibilization aid decision-making method the most according to claim 4, it is characterised in that
The formula calculating ambient heat resistance in step S2 is:
Wherein, θcFor aerial condutor temperature, θeWire place ambient temperature, CxFor steel-cored aluminium strand
Steel core thermal capacitance Cx1Thermal capacitance C with steel core aluminum stranded conductor aluminiumx2Sum, WC=I2Rc(θc) it is wire self-heating amount.
Distribution line dynamic compatibilization aid decision-making method the most according to claim 1, it is characterised in that
The method reducing voltage drop in step S3 includes: by there being load adjustable transformer to improve source voltage terminal, take
Series compensation reduces line reactance, compensates in parallel and reduces the idle transmission of circuit.
Distribution line dynamic compatibilization aid decision-making method the most according to claim 1, it is characterised in that
Step S4 carries out the method for recruitment evaluation particularly as follows:
Calculate increase the electricity charge income after capacity and reforming equipment expense, labour cost, line loss expense and
The difference of maintenance cost, is denoted as financial net present value, compares the financial net present value before and after dynamic compatibilization, selects
The bigger scheme of net present value (NPV) is as economically viable scheme.
8. a distribution line dynamic compatibilization aid decision-making system, it is characterised in that including:
Monitoring Data access unit, for obtaining the Real-time Monitoring Data of distribution line, including operational factor
With microclimate parameter, and the data monitored are sent back auxiliary in a standardized format by communication network
Decision-making platform, for analysis decision；
The thermally-stabilised online check unit of circuit, for setting up distribution wire hot road transient state mould according to Monitoring Data
Type, and calculate maximum allowed current when moment conductor temperature to be measured reaches 70 degree, and then derivation circuit can
Increase the size of capacity；
Low-voltage is analyzed and governance unit, for carrying out dynamic compatibilization according to the maximum allowed current obtained,
And judge whether line end voltage is decreased below the requirement of standard, if less than standard, reducing voltage drop；
Recruitment evaluation unit, for carrying out effect according to the method for financial net present value analysis in engineering economy
Assessment.
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| CN107246925A (en) * | 2017-05-27 | 2017-10-13 | 上海海能信息科技有限公司 | A kind of current transformer thermal circuit model analysis method |
| CN107292442A (en) * | 2017-06-27 | 2017-10-24 | 国网江西省电力公司电力科学研究院 | A kind of 10kV power distribution networks low-voltage plans improvement and appraisal procedure automatically |
| CN109494622A (en) * | 2018-12-30 | 2019-03-19 | 国网北京市电力公司 | Remodeling method, device, storage medium and the processor of overhead distribution |
| CN111668829A (en) * | 2020-05-11 | 2020-09-15 | 国网福建省电力有限公司 | Meteorological characteristic factor-based power distribution network low-voltage user number prediction method |
| CN112946399A (en) * | 2021-03-04 | 2021-06-11 | 国网浙江省电力有限公司嘉兴供电公司 | Line dynamic capacity increasing method based on big data technology |
| CN113111484A (en) * | 2021-03-04 | 2021-07-13 | 国网浙江省电力有限公司嘉兴供电公司 | Dynamic assessment method for capacity increase of power transmission and transformation line |
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| CN109494622A (en) * | 2018-12-30 | 2019-03-19 | 国网北京市电力公司 | Remodeling method, device, storage medium and the processor of overhead distribution |
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| CN111668829B (en) * | 2020-05-11 | 2022-08-05 | 国网福建省电力有限公司 | Meteorological characteristic factor-based power distribution network low-voltage user number prediction method |
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| CN112946399B (en) * | 2021-03-04 | 2022-04-29 | 国网浙江省电力有限公司嘉兴供电公司 | Line dynamic capacity increasing method based on big data technology |
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Application publication date: 20160921 |