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.
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.