CN105406433B - The power of mobile battery energy storage direct current ice melting system and capacity optimum option method - Google Patents
The power of mobile battery energy storage direct current ice melting system and capacity optimum option method Download PDFInfo
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- 238000002844 melting Methods 0.000 title claims abstract description 173
- 230000008018 melting Effects 0.000 title claims abstract description 128
- 238000004146 energy storage Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000009826 distribution Methods 0.000 claims abstract description 20
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 13
- 238000005457 optimization Methods 0.000 claims abstract description 12
- 238000012544 monitoring process Methods 0.000 claims abstract description 6
- 230000005611 electricity Effects 0.000 claims description 21
- 238000012937 correction Methods 0.000 claims description 14
- 239000005955 Ferric phosphate Substances 0.000 claims description 12
- 229940032958 ferric phosphate Drugs 0.000 claims description 12
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 claims description 12
- 229910000399 iron(III) phosphate Inorganic materials 0.000 claims description 12
- 229910052744 lithium Inorganic materials 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 9
- 239000004020 conductor Substances 0.000 claims description 9
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- 230000000694 effects Effects 0.000 claims description 6
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 3
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- 239000000725 suspension Substances 0.000 claims description 3
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/16—Devices for removing snow or ice from lines or cables
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Abstract
Comprise the following steps the present invention relates to a kind of power of mobile battery energy storage direct current ice melting system and capacity optimum option method：Step S1：A mobile battery energy storage direct current ice melting system is provided, the direct current ice melting system includes battery energy storage system, two way convertor, DC/DC DC converters, background monitoring and switch combination；Step S2：Power grid ice region distribution situation is counted；Step S3：Calculate current value of the direct current ice melting system during DC ice melting；Step S4：Calculate ice-melt power, ice-melt capacity and the optimization method of direct current ice melting system under " 11,12 ", " 11,11 ", " 12,12,12 " three kinds of ice-melting modes.Angle of the present invention from system cost, according to ice formation situation, state's net directive/guide and mountain route actual conditions, calculate the power and capacity requirement of the direct current ice melting system of three kinds of ice-melting modes, cost optimization equation is proposed, the power and capacity that may be based on mobile battery energy storage direct current ice melting system choose offer foundation.
Description
Technical field
The present invention relates to ice melting system field, the particularly a kind of power and capacity of mobile battery energy storage direct current ice melting system
Optimum option method.
Background technology
Ice disaster suffers from serious harm to power network, traffic and crops etc., and the serious icing of electric line can be led
Cause its mechanically and electrically performance drastically decline, so as to cause the generation of icing density.Although Fujian Province is located in In South China, Fujian
There is icing when north, distribution network line winter in Min Dong and Min Xi High aititude mountain area, resident's daily life and industrial or agricultural are given birth to
Production causes very detrimental effect, and 2008 especially serious, and strong cold air starts to invade Fujian Province from late January, continues more than ten
It low temperature is along with sleet, snow ice, icing, and electrical network facilities large area is damaged, numerous electric lines fall to go here and there because of icing,
Broken string, fall tower and forced outage, cause Fujian Counties of North-west Five 220kV and following system to be inflicted heavy losses on, it is Jianning, Shaowu, gloss, peaceful
Change, Pucheng, Changting, Taining, upper Hangzhoupro, Wuyi Mountain, Wuping Deng26Ge counties (city) part small towns by different degrees of loss, wherein
The most serious with Jianning, Shaowu, gloss, Ninghua, the counties and cities of Pucheng five, 35kV and level below power network occurrence of large-area have a power failure.And
When effectively transmission ＆ distribution icing circuit is carried out except ice-melt is to reduce one of important channel of power network icing disaster loss, therefore good fortune can be directed to
Mountain area medium-voltage line is built, the medium-voltage line DC ice melting technology based on mobile battery energy storage device is studied, proposes the ice melting system
Power and capacity optimum option method.
The content of the invention
In view of this, it is an object of the invention to provide a kind of power of mobile battery energy storage direct current ice melting system and capacity are excellent
Change choosing method, from the angle of system cost, it is proposed that cost optimization equation, may be based on mobile battery energy storage direct current and melt
The power and capacity of ice system, which are chosen, provides foundation.
The present invention is realized using following scheme：A kind of power of mobile battery energy storage direct current ice melting system optimizes with capacity to be selected
Method is taken, is comprised the following steps：
Step S1：A mobile battery energy storage direct current ice melting system is provided, the direct current ice melting system includes battery energy storage system
System, two way convertor, DC/DC DC converters, background monitoring and switch combination；The battery energy storage system includes and through transport
Capable ferric phosphate lithium cell cabinet and battery management system, wherein battery rack are formed by a sequence ferric phosphate lithium cell case connection in series-parallel；
Step S2：Power grid ice region distribution situation is counted；
Step S3：Calculate current value of the direct current ice melting system during DC ice melting；
Step S4：Calculate that " 1-1,1-2 ", " 1-1,1-1 ", " direct current melts under three kinds of ice-melting modes of 1-2,1-2,1-2 "
Ice-melt power, ice-melt capacity and the optimization method of ice system.
Further, the step S2 is counted according to the ice covering thickness of different altitude height to ice formation distribution situation,
Specifically include following steps：
Step S21：Calculating standard ice thickness：It is density 0.9g/ by different densities, ice covering thickness equivalent of different shapes
The cm3 uniform standard ice covering thickness wrapped around wire, then standard ice thickness calculated again by icing ice, its calculation formula
It is as follows：
In formula：b0For standard ice thickness；G is ice weight；L is icing body length；R is wire radius；
Step S22：The height correction of calculating standard ice thickness and line footpath amendment：Should by circuit design specification requirement ice covering thickness
Reduction is to 10m eminences, then shown in altitude correction factor equation below：
Kh=(Z/Z0)α
Shown in line footpath correction factor equation below：
In above formula：KhFor altitude correction factor；Z takes 10m；Z0To survey or investigating ice coating wire suspension height；α is finger
Number, it is relevant with capture coefficient with wind speed, water content, if during without field data, α can value 0.22；For line footpath correction factor；
For design diameter of wire, φ≤40mm；To survey or investigating the diameter of wire of icing；
Step S23：Calculate different reoccurrence standard ice thickness：United respectively according to 30 years, 100 year return period of 50 years one-levels
Meter, can be using icing data method, CRREL modellings, the local landform of meteorological parameter Return Law one-level-meteorological effect icing grade mould
Type method determines the ice covering thickness of different reoccurrence；
Step S24：Ice covering thickness is modified with altitude change：Ice covering thickness increases and increased with height above sea level, utilizes
Several different altitude heights calculate obtained different reoccurrence standard ice thickness value, fit the index that ice thickness changes with height above sea level
Formula, shown in equation below：
Rh=β eah
In formula：RhFor a certain height above sea levelhOn ice thickness；A and β is undetermined parameter.
Further, in the step S3, ice melting current of the direct current ice melting system during DC ice melting is using following
Formula is calculated：
In formula：ImeltFor ice melting current；R0For 0 DEG C when one meter of long wire resistance value；Δ t is conductor temperature and the external world
Temperature difference；RT0It is relevant with thermal conductivity factor for equivalent ice sheet thermal-conduction resistance；D is the external diameter after conductor icing；D is diameter of wire；
RT1It is relevant with wind speed for convection current and radiological equivalent thermal resistance；B is ice layer thickness；g0For the proportion of ice, 0.9, T is taken by glazemeltFor
The ice-melt time；
Then DC ice melting current should be chosen between minimum ice melting current and maximum ice melting current, wherein calculating minimum direct current
The calculation formula of ice melting current is as follows：
When heating wires make its temperature rise to 90 DEG C, the following institute of calculation formula of maximum DC ice melting current is calculated
Show：
In formula：IminFor minimum ice melting current；ImaxFor maximum ice melting current；t2For ambient temperature；V is wind speed, and its value is big
In 2m/s；Σ i are radiation coefficient.
Further, in the step S4, it is 10mm, single DC ice-melting length that direct current ice melting system, which chooses ice covering thickness,
For 4km, circuit model LGJ-120, environment temperature is -4 DEG C, and wind speed carries out ice-melt work for 5m/s environment, calculates described
Direct current ice melting system " 1-1,1-2 ", " 1-1,1-1 ", " ice-melt power and ice-melt appearance under three kinds of ice-melting modes of 1-2,1-2,1-2 "
Amount；Wherein " 1-1 " enters an access way, " 1-2 " is that ice-melt power supply one enters twice access ways for ice-melt power supply one；
It is described that " 1-1,1-2 " ice-melting mode is specially：Ice-melt is carried out using two DC/DC DC converters, wherein first
One output end of DC/DC DC converters is connected with the A phases of ac bus, and another output end is connected with the B phases of ac bus；The
One output end of two DC/DC DC converters is connected with the A phases of ac bus and B phases, the C of another output end and ac bus
It is connected；
It is described that " 1-1,1-1 " ice-melting mode is specially：Ice-melt is carried out using two DC/DC DC converters, wherein first
One output end of DC/DC DC converters is connected with the A phases of ac bus, and another output end is connected with the B phases of ac bus；The
One output end of two DC/DC DC converters is connected with the B phases of ac bus, and another output end is connected with the C phases of ac bus；
It is described that " 1-2,1-2,1-2 " ice-melting mode is specially：Ice-melt is carried out using three DC/DC DC converters, wherein
One output end of the first DC/DC DC converters is connected with the A phases of ac bus, the B phases of another output end and ac bus with
And C phases are connected；One output end of the 2nd DC/DC DC converters is connected with the A phases of ac bus and B phases, another output end
It is connected with the C phases of ac bus；One output end of the 3rd DC/DC DC converters is connected with the A phases of ac bus and C phases,
Another output end is connected with the B phases of ac bus.
Further, it is described " 1-1,1-2 ", " under 1-2,1-2,1-2 " ice-melting mode, because two-phase lines in parallel is equal
Stream, ice-melt effect is not had, then on border by parallel line substantially close to critical current per road electric current to icing circuit in parallel
In the case of condition is constant, ignore the change of conductor impedance in deicing processes, it is DC converter to choose each ice-melt power
Rated power：
In formula：E1-1,1-2For the electricity spent by " 1-1,1-2 " ice-melting mode ice-melt；E1-1,1-1For " 1-1,1-1 " ice-melt side
Electricity spent by formula ice-melt；E1-2,1-2,1-2For the electricity spent by " 1-2,1-2,1-2 " ice-melting mode ice-melt；PrIt is straight for ice-melt
The rated power of current converter, kW；I1-1Enter an ice melting current for one；I1-2Enter twice ice melting currents for one；L is line ice-melting
Length；r0For the resistance per unit length of circuit, influence of the temperature change to it in deicing processes is not considered.
Further, " the ice-melt voltage and ice-melt power of 1-1,1-2 " ice-melting mode enter below equation respectively using described
It is shown：
U1-1=2r0lI1-1
In formula：U1-1For the DC ice melting voltage under " 1-1 " ice-melt plant-grid connection mode；P1-1Connect for " 1-1 " ice-melt power supply
Ice-melt power needed for entering under mode.
Further, the cost of the direct current ice melting system is become by battery energy storage system, two way convertor and DC/DC direct currents
The cost of the influence of parallel operation cost, wherein battery energy storage system depends on the quantity and price of connection in series-parallel ferric phosphate lithium cell case,
Can obtain shown in the ice-melt power of the direct current ice melting system and the optimization method equation below of capacity, DC ice melting current be its about
Beam condition：
In formula：F is direct current ice melting system totle drilling cost；fPCSFor the PCS prices of unit power；fDC-DCFor the DC- of unit power
DC DC converter prices；fbFor the price of single battery case；P1 is the power of single battery case；C1 is the appearance of single battery case
Amount.
Compared with prior art, the power and capacity of a kind of mobile battery energy storage direct current ice melting system that the present invention is provided are excellent
Change choosing method, according to ice formation situation, state's net directive/guide and mountain route actual conditions, calculating analyzes " 1-1,1-2 ", " 1-
1,1-1 ", " power and capacity requirement of the direct current ice melting system of three kinds of ice-melting modes of 1-2,1-2,1-2 "；From ice-melting mode and it is
The angle of system cost is set out to be optimized to the power and capacity of DC ice melting, proposes the medium-voltage line based on mobile energy storage device
The cost optimization equation of ice melting system, the power and capacity that may be based on the direct current ice melting system of mobile battery energy storage device is chosen
Foundation is provided.
Brief description of the drawings
Fig. 1 is the mobile battery energy storage direct current ice melting system structure chart of the present invention.
Fig. 2 is the wire deicing processes schematic diagram of the present invention.
Fig. 3 (a) is " the DC converter wiring schematic diagram of 1-1,1-2 " ice-melting mode of the invention.
Fig. 3 (b) is " the DC converter wiring schematic diagram of 1-1,1-1 " ice-melting mode of the invention.
Fig. 3 (c) is " the DC converter wiring schematic diagram of 1-2,1-2,1-2 " ice-melting mode of the invention.
Fig. 4 is the graph of a relation of power and ice-melt capacity under different ice-melting modes of the invention.
Fig. 5 is ice-melt time and the graph of a relation of ice-melt power under different ice-melting modes of the invention.
Fig. 6 (a) is ice melting current of the present invention, voltage and ice-melt time chart.
Fig. 6 (b) is ice-melt power of the present invention, capacity and ice-melt time chart.
Fig. 7 is present system cost and rated power graph of a relation.
Fig. 8 is the method flow schematic diagram of the present invention.
Embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention will be further described.
There is provided a kind of power of mobile battery energy storage direct current ice melting system and capacity are excellent by taking In Fujian Province as an example for the present embodiment
Change choosing method, as shown in figure 8, comprising the following steps：
Step S1：A mobile battery energy storage direct current ice melting system is provided, the direct current ice melting system includes battery energy storage system
System, two way convertor, DC/DC DC converters, background monitoring and switch combination；The battery energy storage system includes and through transport
Capable ferric phosphate lithium cell cabinet and battery management system, wherein battery rack are formed by a sequence ferric phosphate lithium cell case connection in series-parallel；
Step S2：Power grid ice region distribution situation is counted；
Step S3：Calculate current value of the direct current ice melting system during DC ice melting；
Step S4：Calculate that " 1-1,1-2 ", " 1-1,1-1 ", " direct current melts under three kinds of ice-melting modes of 1-2,1-2,1-2 "
Ice-melt power, ice-melt capacity and the optimization method of ice system.
In the present embodiment, the medium-voltage line direct current ice melting system based on mobile battery energy storage device is by battery energy storage system
System, two way convertor, DC converter, background monitoring and switch combination are constituted, and are integrated to mobile railway carriage.One or many shifting
The parallel running of dynamic formula energy storage device completes ice-melt work, and the concrete composition structure of system is as shown in figure 1, battery energy storage system is main
It is made up of the ferric phosphate lithium cell cabinet of parallel running with battery management system, wherein battery rack is by a sequence ferric phosphate lithium cell case
Connection in series-parallel is formed, and two way convertor is respectively to exchange discharge and recharge and DC ice melting interface with DC converter.
In the present embodiment, Fujian is located in south China, and latitude is relatively low, and the relative probability of ice and snow low temperature is small, the sight ice of laying
Stand also seldom, the height above sea level on the two big mountain range of In Western Fujian Province and middle part is higher, as power network electric line is in High aititude
Area increases, and more serious icing disaster also occurs, from the point of view of all previous ice damage situation, ice damage region is concentrated mainly on Fujian Province
Northwestward region, in this region the point of disaster-stricken most serious be concentrated mainly on Jiangxi adjacent area, height above sea level 500 meters with
On Longyan, Nan Ping northwestward region icing disaster it is more serious, Sanming City northwestward region icing of the height above sea level more than 300 meters
Disaster is more serious, and the statistical analysis of Fujian Province ice formation distribution can provide weight for the ice-covering-proof design of electric line with retrofit work
The reference frame wanted.
In the present embodiment, Fujian Province's power grid ice region Statistic Analysis foundation includes：Fujian weather bureau observation data, electricity
Data and the standard ice thickness being fitted according to glaze, rime are observed in knot ice observation station；Different altitude height ice covering thickness is fitted
Formula；Ice damage and operation of power networks experience；Terrain data etc..Statistical analysis is comprised the following steps that：
(1) standard ice thickness is calculated., need to be by different densities, of different shapes in order that the whole province's icing zone plotting unified and standardization
The uniform standard ice covering thickness wrapped around wire that ice covering thickness equivalent is density 0.9g/cm3.Each icing observation station
Standard ice thickness calculated again by icing ice, shown in its calculation formula such as formula (1)：
In formula：b0For standard ice thickness, mm；G is ice weight, g；L is icing body length, m；R is wire radius, mm.
(2) height of standard ice thickness, line footpath amendment.Icing size and wind speed, air moisture content are in close relations.Different height
Wind speed, water content have difference.In the increase of near-earth air layer wind speed with altitude, wind speed is bigger, and the water droplet of wire capture, crystal are just
The more, icing is just bigger.China's circuit design specification requirement ice covering thickness answers reduction to 10m eminences, altitude correction factor such as public affairs
Shown in formula (2).Line footpath correction factor should be analyzed according to field data and determined, unsurveyed area by being repaiied formula (3) Suo Shi
Positive coefficient carries out line footpath amendment：
Kh=(Z/Z0)α (2)
In formula：KhFor altitude correction factor；Z takes 10m；Z0To survey or investigating ice coating wire suspension height, m；α is index,
Relevant with capture coefficient with wind speed, water content, during no field data, α can value 0.22；For line footpath correction factor；To set
Count diameter of wire, mm, φ≤40mm；To survey or investigating the diameter of wire of icing, mm.
(3) different reoccurrence standard ice thickness is calculated.The distribution of Fujian Province ice formation is distinguished generally according to 30,50,100 year return period
Counted., can be using icing data method, CRREL modellings, the meteorological parameter Return Law, local according to various regions actual conditions
The methods such as shape-meteorological effect icing Grade Model method determine the ice covering thickness of different reoccurrence.
(4) ice covering thickness with altitude change amendment.Because ice covering thickness increases with height above sea level and increases, wire icing
In Beneath Clouds height, its condensation number is with height exponentially changing rule, therefore utilize several different altitude height weather stations
Different reoccurrence standard ice thickness value, the exponential formula that ice thickness changes with height above sea level is fitted, shown in such as formula (4)：
Rh=β eah (4)
In formula：RhFor the ice thickness on a certain height above sea level h；A and β is undetermined parameter.
Obtained according to above-mentioned ice formation distribution statisticses division methods under Central Southern Fujian Province and northern territory different altitude height
Ice formation distribution situation respectively as shown in Table 1 and Table 2.As can be seen from the table, Fujian Province's ice covering thickness changes with height above sea level
Obvious, northern territory icing situation is serious compared with southern.
The Fujian Mountainous Area of North ice formation distribution situation of table 1 (to the north of in the of 26 ° 30 ')
The Middle and southern part of Fujian province mountain range ice formation distribution situation of table 2 (on the south in the of 26 ° 30 ')
In the present embodiment, due to urban and rural power grids disparate development, In Fujian Rural Areas Power grid structure, power network equipment and skill
Art level, power supply quality are significantly lower than urban distribution network.MV distribution systems typically using built on stilts wiring, segmentation, contact ratio compared with
It is low.Line conductor section is less than normal, and the 10kV circuits line footpath of the whole province's rural power grids 36% is less than 95mm2, and 20% medium-voltage line line footpath exists
95mm2 is between 150mm2.Rural power grids medium-voltage line radius of electricity supply is long, wherein the whole province 10kV circuits average length 12.8km, if
The standby ability withstood natural calamities is relatively low.
《State Grid Corporation of China " 12 " distribution network planning (engineering philosophy) instruction》By the power supply area of power distribution network
The criteria for classifying is broadly divided into the class of A, B, C, D tetra-.C class power supply areas refer mainly to the industry of the outer suburbs, the small towns of population Relatively centralized
Area and rural area based on agricultural industry ground village, its load density is between 1~6MW/km2.It is main herein to consider at least
Ice-melt can be carried out to the backbone total length in the radius of electricity supply in C classes area, the radius of electricity supply of C classes area medium-voltage line is general not
More than 4km, trunk overhead line takes LGJ120.
At present, direct current thermodynamics ice-melt is surely belonged to applied to power network line ice-melt most common method.According to deicing processes
Many researchs understand that deicing processes are broadly divided into following 2 stages：First stage is by the fully wrapped around feelings of ice in cylinder
Ice-melt under condition；In second stage, cylinder upper surface, which breaks ice cylinder, makes ice come off.When ice sheet upper table vertex of surface and wire upper table
Vertex of surface is contacted, the now deadweight of ice will be greater than and and the shear stress of ice sheet that contacts of conductive line surfaces, and come off from wire.Melt
Ice detailed process is as shown in Figure 2.
The Joule heat that electric current is produced during DC ice melting is mainly acted on：Ice is dissolved into the latent heat of phase change of water, ice sheet temperature
The heat and convection current and the heat loss through radiation on ice sheet surface spent needed for rising, can be by corresponding heat conduction, right according to the thermal balance relation
The dynamic factor such as stream and heat loss through radiation is converted to equivalent thermal resistance, and Q/GDW 716-2012 are netted using state《Transmission line of electricity electric current ice-melt
Fire protection technology》DC ice melting current calculation formula, as shown in formula (5)：
In formula：ImeltFor ice melting current (peace)；R0For DEG C when wire resistance per unit length (Europe/rice)；Δ t is conductor temperature
The difference (degree Celsius) of degree and ambient temperature；RT0It is relevant with thermal conductivity factor for equivalent ice sheet thermal-conduction resistance (degree centimetre/watt)；D is
External diameter (centimetre) after conductor icing；D is diameter of wire (centimetre)；RT1For convection current and radiological equivalent thermal resistance (degree centimetre/watt),
It is relevant with wind speed；B is ice layer thickness；g0For the proportion of ice, typically 0.9, T is taken by glazemeltFor the ice-melt time.
From formula (5), under same boundary condition, it is smaller that the ice-melt deadline takes, and wire ice melting current will
Ask bigger, but the energy that ice-melt expends is smaller, therefore ice-melt power should take the maximum of rating of set every time.Meanwhile, wire melts
Ice electric current should be chosen between minimum ice melting current and maximum ice melting current, and this is also the selection range of ice melting current.Definition is most
Small ice melting current is：Its Joule heat produced is all delivered in air by the convection current radiation of ice sheet, calculation formula such as formula
(6) shown in；Defining maximum ice melting current is：Heating wires make the ice melting current that its temperature rises to 90 DEG C, and its calculation formula is such as
Shown in formula (7) [10-11].
In formula：IminFor minimum ice melting current；ImaxFor maximum ice melting current；t2For ambient temperature；V is wind speed, and its value is big
In 2m/s；Σ i are radiation coefficient.
In the present embodiment, the height above sea level for the power supply area that Fujian Province mountain area is extended by middle pressure network frame mostly exists
Below 1000m, from the point of view of Fujian Province's transmission and distribution network icing situation analysis in 2008, the more extreme ice covering thickness master of medium-voltage line
Concentrate on 10mm or so, substantially 50 years one chances in Middle and southern part of Fujian province and the north height above sea level 500m to 900m ice formations, this is also with 2008
Year ice damage is that 50 years one chances match.Consider herein under the conditions of more extreme icing based on mobile battery energy storage device
Direct current ice melting system, which possesses, meets the ice melting capability that C classes power supply area is directed to medium-voltage line, and selection ice covering thickness is 10mm, single
DC ice-melting length is 4km, and circuit model LGJ-120, environment temperature is -4 DEG C, and wind speed is 5m/s.Using these conditions as base
Plinth, calculates ice melting current and " 1-1,1-2 ", " 1-1,1-1 ", " the ice-melt capacity under three kinds of ice-melting modes of 1-2,1-2,1-2 ".
As shown in Fig. 3 (a), described " 1-1,1-2 " ice-melting mode is specially：Carried out using two DC/DC DC converters
Ice-melt, wherein an output end of the first DC/DC DC converters is connected with the A phases of ac bus, another output end is with exchanging mother
The B phases of line are connected；One output end of the 2nd DC/DC DC converters is connected with the A phases of ac bus and B phases, another output
End is connected with the C phases of ac bus；
As shown in Fig. 3 (b), described " 1-1,1-1 " ice-melting mode is specially：Carried out using two DC/DC DC converters
Ice-melt, wherein an output end of the first DC/DC DC converters is connected with the A phases of ac bus, another output end is with exchanging mother
The B phases of line are connected；One output end of the 2nd DC/DC DC converters is connected with the B phases of ac bus, and another output end is with exchanging
The C phases of bus are connected；
As shown in Fig. 3 (c), described " 1-2,1-2,1-2 " ice-melting mode is specially：Using three DC/DC DC converters
Ice-melt is carried out, wherein an output end of the first DC/DC DC converters is connected with the A phases of ac bus, another output end is with handing over
The B phases and C phases for flowing bus are connected；One output end of the 2nd DC/DC DC converters and the A phases of ac bus and B phase phases
Even, another output end is connected with the C phases of ac bus；One output end of the 3rd DC/DC DC converters and the A phases of ac bus
And C phases are connected, another output end is connected with the B phases of ac bus.
In the present embodiment, for " 1-1 (ice-melt power supply one enters a tieback and entered), (ice-melt power supply one enters two tiebacks to 1-2
Enter) ", " 1-2,1-2,1-2 " mode, because two-phase lines in parallel flows, by parallel line per road electric current close to critical current,
Ice-melt effect is not had substantially to icing circuit in parallel.In the case of boundary condition is constant, ignores wire in deicing processes and hinder
Anti- change, chooses the rated power that each ice-melt power is device：
In formula：E1-1,1-2For " electricity spent by 1-1,1-2 " mode ice-melt, kWh；E1-1,1-1Melt for " 1-1,1-1 " mode
Electricity spent by ice, kWh；E1-2,1-2,1-2For " electricity spent by 1-2,1-2,1-2 " mode ice-melt, kWh；PrIt is straight for ice-melt
The rated power of current converter, kW；I1-1Enter an ice melting current, A for one；I1-2Enter twice ice melting currents, A for one；L is circuit
Ice-melt length, km；r0For the resistance per unit length of circuit, Ω/m does not consider shadow of the temperature change to it in deicing processes herein
Ring.
As shown in Figure 4, when the rated power that each selection ice-melt power is system carries out ice-melt, and specified work(to circuit
When rate is more than 146.59kW, " total electricity that ice-melt is consumed under 1-1,1-2 " mode is minimum.Again as shown in Figure 5, when ice-melt power
During less than 146.59kW, the ice-melt time that ice-melt is consumed under " 1-1 " mode is more than 2.31 hours, ice-melt institute under " 1-2 " mode
The ice-melt time of consumption need to be more than 1.16 hours, i.e., " ice-melt total time is more than 3.47 hours under 1-1,1-2 " ice-melting mode, " 1-
Ice-melt total time under 2,1-2,1-2 " ice-melting mode is more than 3.48 hours, and both of which greatly exceed《Transmission line of electricity electric current melts
Ice fire protection technology》In for the ice-melt time regulation, and it is excessive to expend electricity.Therefore, in order within the defined time to defeated
Electric line carries out effective deicing, and makes the total electricity consumed in deicing processes minimum, therefore the present embodiment uses " 1-1,1-2 "
DC ice melting mode.
In order to meet the requirement of ice-melt voltage and power, the VD and power designs of ice melting system should be with " 1-
Value under 1 " ice-melt plant-grid connection mode is normative reference.Using " the ice-melt voltage and ice-melt power of 1-1,1-2 " ice-melting mode
As shown in formula (11) and (12)：
U1-1=2r0lI1-1 (11)
In formula：U1-1For the DC ice melting voltage (V) under " 1-1 " ice-melt plant-grid connection mode；P1-1For " 1-1 " ice-melt power supply
Ice-melt power (kW) needed under access way.
According to line parameter circuit value, ambient parameter and the ice-melting mode of above-mentioned selected C classes service area, calculating obtains ice-melt electricity
Stream, ice-melt voltage, ice-melt power and ice-melt capacity and the graph of a relation of ice-melt time are as shown in Figure 6.
In the present embodiment, from ice melting system cost angle consideration, the medium-voltage line direct current based on energy storage device melts
The cost of the background monitoring of ice system, switch combination and container body is relatively fixed, and the principal element of influence system cost is storage
The cost of energy system, two way convertor and DC converter.In order to rationally using resource, it is necessary to the work(of the optimum option set system
Rate and capacity, make the minimization of cost of system, and the selection of the power and capacity of simultaneity factor will be also limited by under boundary condition
DC ice melting demand.Consider the cost that influence system cost principal element is energy-storage system, two way convertor and DC converter,
The cost of energy-storage system depends on the quantity and price of connection in series-parallel ferric phosphate lithium cell case, can obtain the optimization of system power and capacity
Shown in equation such as formula (13), DC ice melting current is its constraints：
In formula：F is direct current ice melting system totle drilling cost, ten thousand yuan/kW；fPCSFor the PCS prices of unit power, ten thousand yuan/kW；
fDC-DCFor the DC-DC DC converter prices of unit power, ten thousand yuan/kW；fbFor the price of single battery case, ten thousand yuan/；P1 is
The power of single battery case, kW；C1 is the capacity of single battery case, kWh.
From Fig. 6 (a) and Fig. 6 (b), the power of direct current ice melting system, energy storage system capacity with the ice-melt time change
Trend in the presence of the optimal value of an ice-melt power and ice-melt capacity on the contrary, then make ice melting system totle drilling cost in formula (13) minimum.
Selection ice covering thickness is 10mm, and line length is 4km, and circuit model LGJ-120, environment temperature is -4 DEG C, and wind speed is 5m/s
For boundary condition, power and capacity, remaining ice melting system needed for the ice melting system in the range of DC ice melting current is allowed are calculated
Parameter is as shown in table 3.
The ice melting system cost parameter of table 3
The totle drilling cost of ice melting system is obtained with the relation of ice-melt time as shown in fig. 7, as seen from the figure, system is total by calculating
There is a minimum value in cost.System cost correspondence ice-melt parameter is as shown in table 3, as seen from table, the ice-melt time under " 1-1 " mode
It it is 0.819 hour for the ice-melt time under 1.43 hours, " 1-2 " mode, ice-melt voltage is that 549.40V, direct current melt under " 1-1 " mode
When the rated power of ice system is that 176.67kW, capacity are 397.32kWh, the lowest cost of direct current ice melting system.
The ice melting system cost of table 4 correspondence ice-melt parameter
In the present embodiment, battery can be damaged because energy storage system discharges are too deep, system service life is reduced, it is preliminary to consider
Under above-mentioned boundary condition, energy-storage system completes mesolow three-phase line ice-melt, and SOC also has 20% pre- allowance, system effectiveness
For 90%, when the above-mentioned capacity of correspondence is 397.32kWh, the capacity of energy-storage system is 576.6kWh.Ferric phosphate lithium cell case includes 3
And 12 string cell, rated voltage, capacity and the lower voltage limit of cell are respectively 3.2V, 66Ah and 2.5V, monomer
The maximum discharge current of battery is 180A.
Therefore, 72 battery cases are chosen, every 18 battery cases series connection is placed in battery rack, 4 battery racks are connected in parallel into Fig. 1 institutes
The battery rack dc bus shown, busbar voltage lower limit is 540V, the electric discharge for the cell that correspondence ice-melt power is 176.67kW
Electric current is 27.3A, and monomer discharge current will not be out-of-limit.Now, the capacity of energy-storage system is 547.4kWh, in above-mentioned boundary condition
Under, energy-storage system completes mesolow three-phase line ice-melt, and SOC residues 19% will not cause electric discharge too deep, meet system optimization and set
Meter is required.
In summary, the present embodiment proposes the direct current ice melting system based on mobile battery energy storage device, introduces good fortune and builds
Province ice formation distribution statistical method；According to ice formation situation, state's net directive/guide and mountain route actual conditions, calculating analyzes three kinds and melted
The power and capacity requirement of the direct current ice melting system of ice mode.From the angle of system cost, it is proposed that cost optimization equation,
The power and capacity that may be based on the direct current ice melting system of mobile battery energy storage device choose offer foundation.
The foregoing is only presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, should all belong to the covering scope of the present invention.
Claims (6)
1. a kind of power of mobile battery energy storage direct current ice melting system and capacity optimum option method, it is characterised in that：Including with
Lower step：
Step S1：There is provided a mobile battery energy storage direct current ice melting system, the direct current ice melting system includes battery energy storage system, double
To current transformer, DC/DC DC converters, background monitoring and switch combination；The battery energy storage system includes parallel running
Ferric phosphate lithium cell cabinet and battery management system, wherein battery rack are formed by a sequence ferric phosphate lithium cell case connection in series-parallel；
Step S2：Power grid ice region distribution situation is counted；
Step S3：Calculate current value of the direct current ice melting system during DC ice melting；
Step S4：Calculate " 1-1,1-2 ", " 1-1,1-1 ", " DC ice melting system under three kinds of ice-melting modes of 1-2,1-2,1-2 "
Ice-melt power, ice-melt capacity and the optimization method of system；
The step S2 is counted according to the ice covering thickness of different altitude height to ice formation distribution situation, specifically includes following step
Suddenly：
Step S21：Calculating standard ice thickness：It is density 0.9g/cm3 by different densities, ice covering thickness equivalent of different shapes
The uniform standard ice covering thickness wrapped around wire, then standard ice thickness calculated again by icing ice, its calculation formula is such as
Shown in lower：
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In formula：b0For standard ice thickness；G is ice weight；L is icing body length；R is wire radius；
Step S22：The height correction of calculating standard ice thickness and line footpath amendment：Reduction is answered by circuit design specification requirement ice covering thickness
To 10m eminences, then shown in altitude correction factor equation below：
Kh=(Z/Z0)α
Shown in line footpath correction factor equation below：
In above formula：KhFor altitude correction factor；Z takes 10m；Z0To survey or investigating ice coating wire suspension height；α is index, with
Wind speed, water content are relevant with capture coefficient, if during without field data, α values 0.22；For line footpath correction factor；For design
Diameter of wire, φ≤40mm；To survey or investigating the diameter of wire of icing；
Step S23：Calculate different reoccurrence standard ice thickness：Counted respectively according to 30 years, 50 years and 100 year return periods,
Using icing data method, CRREL modellings, the local landform of meteorological parameter Return Law one-level-meteorological effect icing Grade Model method
Determine the ice covering thickness of different reoccurrence；
Step S24：Ice covering thickness is modified with altitude change：Ice covering thickness increases and increased with height above sea level, using several
Different altitude height calculates obtained different reoccurrence standard ice thickness value, fits the index public affairs that ice thickness changes with height above sea level
Formula, shown in equation below：
Rh=β eah
In formula：RhFor the ice thickness on a certain height above sea level h；A and β is undetermined parameter.
2. a kind of power of mobile battery energy storage direct current ice melting system according to claim 1 and capacity optimum option side
Method, it is characterised in that：In the step S3, ice melting current of the direct current ice melting system during DC ice melting uses below equation
Calculate：
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In formula：ImeltFor ice melting current；R0For 0 DEG C when one meter of long wire resistance value；Δ t is conductor temperature and ambient temperature
Difference；RT0It is relevant with thermal conductivity factor for equivalent ice sheet thermal-conduction resistance；D is the external diameter after conductor icing；D is diameter of wire；RT1
It is relevant with wind speed for convection current and radiological equivalent thermal resistance；B is ice layer thickness；g0For the proportion of ice, 0.9, T is taken by glazemeltTo melt
The ice time；
Then DC ice melting current should be chosen between minimum ice melting current and maximum ice melting current, wherein calculating minimum direct current ice-melt
The calculation formula of electric current is as follows：
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When heating wires make its temperature rise to 90 DEG C, the calculation formula for calculating maximum DC ice melting current is as follows：
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In formula：IminFor minimum ice melting current；ImaxFor maximum ice melting current；t2For ambient temperature；V is wind speed, and its value is more than 2m/
s；∑ i is radiation coefficient；R90For 90 DEG C when one meter of long wire resistance value；
3. a kind of power of mobile battery energy storage direct current ice melting system according to claim 1 and capacity optimum option side
Method, it is characterised in that：In the step S4, it is 10mm that direct current ice melting system, which chooses ice covering thickness, and single DC ice-melting length is
4km, circuit model LGJ-120, environment temperature are -4 DEG C, and wind speed carries out ice-melt work for 5m/s environment, calculate described straight
Flow ice melting system " 1-1,1-2 ", " 1-1,1-1 ", " ice-melt power and ice-melt appearance under three kinds of ice-melting modes of 1-2,1-2,1-2 "
Amount；Wherein " 1-1 " enters an access way, " 1-2 " is that ice-melt power supply one enters twice access ways for ice-melt power supply one；
It is described that " 1-1,1-2 " ice-melting mode is specially：Ice-melt is carried out using two DC/DC DC converters, wherein the first DC/DC
One output end of DC converter is connected with the A phases of ac bus, and another output end is connected with the B phases of ac bus；2nd DC/
One output end of DC DC converters is connected with the A phases of ac bus and B phases, another output end and the C phase phases of ac bus
Even；
It is described that " 1-1,1-1 " ice-melting mode is specially：Ice-melt is carried out using two DC/DC DC converters, wherein the first DC/DC
One output end of DC converter is connected with the A phases of ac bus, and another output end is connected with the B phases of ac bus；2nd DC/
One output end of DC DC converters is connected with the B phases of ac bus, and another output end is connected with the C phases of ac bus；
It is described that " 1-2,1-2,1-2 " ice-melting mode is specially：Ice-melt is carried out using three DC/DC DC converters, wherein first
One output end of DC/DC DC converters is connected with the A phases of ac bus, another output end and the B phases and C phases of ac bus
It is connected；One output end of the 2nd DC/DC DC converters is connected with the A phases of ac bus and B phases, and another output end is with exchanging
The C phases of bus are connected；One output end of the 3rd DC/DC DC converters is connected with the A phases of ac bus and C phases, another defeated
Go out end with the B phases of ac bus to be connected.
4. a kind of power of mobile battery energy storage direct current ice melting system according to claim 3 and capacity optimum option side
Method, it is characterised in that：
" 1-1,1-2 ", " under 1-2,1-2,1-2 " ice-melting mode, because two-phase lines in parallel flows, pass through parallel line described
Per road electric current close to critical current, ice-melt effect is not had substantially to icing circuit in parallel, then in the constant situation of boundary condition
Under, ignore the change of conductor impedance in deicing processes, choose the rated power that each ice-melt power is DC converter：
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In formula：E1-1,1-2For the electricity spent by " 1-1,1-2 " ice-melting mode ice-melt；E1-1,1-1Melt for " 1-1,1-1 " ice-melting mode
Electricity spent by ice；E1-2,1-2,1-2For the electricity spent by " 1-2,1-2,1-2 " ice-melting mode ice-melt；PrBecome for ice-melt direct current
The rated power of parallel operation, kW；I1-1Enter an ice melting current for one；I1-2Enter twice ice melting currents for one；L is that line ice-melting is long
Degree；r0For the resistance per unit length of circuit, influence of the temperature change to it in deicing processes is not considered；T1-1Enter one time for one to melt
Ice electric current elapsed time；T1-2Enter twice ice melting current elapsed times for one.
5. a kind of power of mobile battery energy storage direct current ice melting system according to claim 3 and capacity optimum option side
Method, it is characterised in that：
" the ice-melt voltage and ice-melt power of 1-1,1-2 " ice-melting mode enter shown in below equation respectively using described：
U1-1=2r0lI1-1
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In formula：U1-1For the DC ice melting voltage under " 1-1 " ice-melt plant-grid connection mode；P1-1For " 1-1 " ice-melt plant-grid connection side
Ice-melt power needed under formula；I1-1Enter an ice melting current for one；I1-2Enter twice ice melting currents for one；L is that line ice-melting is long
Degree；r0For the resistance per unit length of circuit.
6. a kind of power of mobile battery energy storage direct current ice melting system according to claim 3 and capacity optimum option side
Method, it is characterised in that：The cost of the direct current ice melting system is by battery energy storage system, two way convertor and DC/DC DC convertings
The cost of the influence of device cost, wherein battery energy storage system depends on the quantity and price of connection in series-parallel ferric phosphate lithium cell case, can
The direct current ice melting system ice-melt power and capacity optimization method it is as follows, DC ice melting current be its constrain bar
Part：
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<mi>F</mi>
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<mi>r</mi>
</msub>
<mo>&CenterDot;</mo>
<msub>
<mi>f</mi>
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<mi>C</mi>
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</mfenced>
In formula：F is direct current ice melting system totle drilling cost；fPCSFor the PCS prices of unit power；fDC-DCDC-DC for unit power is straight
Current converter price；fbFor the price of single battery case；P1 is the power of single battery case；C1 is the capacity of single battery case；C1
For the total capacity of ice-melt dc-battery case；IminFor minimum ice melting current；ImaxFor maximum ice melting current；PrFor ice-melt DC converting
The rated power of device；P1-1For the ice-melt power needed under " 1-1 " ice-melt plant-grid connection mode；I1-1Enter an ice-melt electricity for one
Stream；I1-2Enter twice ice melting currents for one；L is line ice-melting length；r0For the resistance per unit length of circuit, ice-melt is not considered
Influence of the temperature change to it in journey；T1-1Enter an ice melting current elapsed time for one；T1-2Enter twice ice melting currents for one
Elapsed time；E1For the electricity spent by " 1-1,1-2 " and " 1-1,1-1 " ice-melting mode ice-melt.
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| CN105958414B (en) * | 2016-06-24 | 2017-11-17 | 国网福建省电力有限公司 | Power distribution network medium-voltage line direct current thermal ice-melting circuit and method based on mobile battery energy storage device |
| CN106571610B (en) * | 2016-10-29 | 2017-12-12 | 南京理工大学 | A kind of transmission line of electricity mechanical deicing order optimization method based on particle cluster algorithm |
| CN106451295B (en) * | 2016-10-29 | 2017-12-08 | 南京理工大学 | A kind of transmission line of electricity mechanical deicing order optimization method based on implicit enumeration method |
| CN109449852B (en) * | 2018-03-23 | 2021-01-26 | 国网浙江省电力公司丽水供电公司 | Distribution line ice melting method in non-power-loss mode |
| CN108844660A (en) * | 2018-07-11 | 2018-11-20 | 云南电网有限责任公司电力科学研究院 | A kind of the conducting wire DC ice melting device for testing temperature rise and method shared based on shaft tower |
| CN109033690B (en) * | 2018-08-16 | 2022-10-11 | 四川大学 | Self-heating transmission conductor uniform power optimization method based on alternating-current heating power supply |
| CN109033691B (en) * | 2018-08-16 | 2022-12-30 | 四川大学 | Self-heating power transmission line parameter optimization method based on alternating current heating power supply |
| CN108985525B (en) * | 2018-08-16 | 2021-08-17 | 四川大学 | Direct-current heating parameter optimization method for self-heating power transmission conductor embedded with uniform material |
| CN109449921A (en) * | 2018-09-29 | 2019-03-08 | 贵州电网有限责任公司凯里供电局 | Mode power distribution network ice-melt reconnaissance optimization method is encouraged by force based on improved adaptive GA-IAGA |
| CN110503340A (en) * | 2019-08-27 | 2019-11-26 | 国网湖南省电力有限公司 | A kind of ant group algorithm and system of DC ice-melting sequence |
| CN112054466A (en) * | 2020-08-28 | 2020-12-08 | 山东理工大学 | De-service lithium battery-based ice melting device and method |
| CN113659515B (en) * | 2021-08-18 | 2023-02-17 | 中国农业大学 | Method and system for determining ice melting scheme of power distribution network line |
| CN114977059A (en) * | 2022-04-19 | 2022-08-30 | 杭州佳辰电力科技有限公司 | Direct-current ice melting method, device and system based on distributed energy storage power station |
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Effective date of registration: 20171130 Address after: 350003 Gulou District, Fujian, Fuzhou No. 54 Road, No. 257 Co-patentee after: State Grid Corporation of China Patentee after: State Grid Fujian Electric Power Co., Ltd. Co-patentee after: Electric Power Research Institute, State Grid Fujian Electric Power Co., Ltd. Co-patentee after: Economic technology academy of State Grid Fujian Electric Power Co., Ltd. Address before: 350003 Gulou District, Fujian, Fuzhou No. 54 Road, No. 257 Co-patentee before: State Grid Corporation of China Patentee before: State Grid Fujian Electric Power Co., Ltd. Co-patentee before: Electric Power Research Institute, State Grid Fujian Electric Power Co., Ltd. |