CN112446150A - Three-dimensional visualization method and system for temperature field of double-water internal cooling synchronous phase modifier - Google Patents
Three-dimensional visualization method and system for temperature field of double-water internal cooling synchronous phase modifier Download PDFInfo
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- 238000001816 cooling Methods 0.000 title claims abstract description 145
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 145
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 112
- 239000003607 modifier Substances 0.000 title claims abstract description 70
- 238000007794 visualization technique Methods 0.000 title claims abstract description 17
- 239000000498 cooling water Substances 0.000 claims abstract description 63
- 238000004364 calculation method Methods 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000012800 visualization Methods 0.000 claims abstract description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 47
- 239000010949 copper Substances 0.000 claims description 45
- 238000012546 transfer Methods 0.000 claims description 45
- 229910052802 copper Inorganic materials 0.000 claims description 39
- 238000004088 simulation Methods 0.000 claims description 30
- 230000020169 heat generation Effects 0.000 claims description 29
- 230000005284 excitation Effects 0.000 claims description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 16
- 230000001419 dependent effect Effects 0.000 claims description 14
- 230000000007 visual effect Effects 0.000 claims description 14
- 239000004020 conductor Substances 0.000 claims description 9
- 238000009413 insulation Methods 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 238000007620 mathematical function Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000017525 heat dissipation Effects 0.000 abstract description 4
- 238000013508 migration Methods 0.000 abstract description 2
- 230000005012 migration Effects 0.000 abstract description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
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- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
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Abstract
The application discloses a three-dimensional visualization method and a three-dimensional visualization system for a temperature field of a double-water internal cooling synchronous phase modifier, which comprise a three-dimensional simplified model of the double-water internal cooling synchronous phase modifier, a calculation of the temperature field of the simplified three-dimensional simplified model of the double-water internal cooling synchronous phase modifier, a function application model of a heat source, a function model of heat dissipation coefficients under different cooling water flow rates and the like. The method simplifies the body model of the double-water internal cooling synchronous phase modifier; the method has the advantages of excellent migration of App; the function application model of the heat source enables the application of the heat source to be simpler, and only the armature current of the double-water internal cooling synchronous phase modulator needs to be input; the function of the heat dissipation coefficient under different cooling water flow rates makes it possible to calculate the temperature fields under different cooling water flow rates. The invention can realize the simplified calculation of the temperature field of the double-water internal cooling synchronous phase modifier, and the model interface is more concise, so that non-professional personnel can also complete the calculation and the setting of the temperature field of the double-water internal cooling synchronous phase modifier.
Description
Technical Field
The invention belongs to the technical field of simulation of temperature fields of synchronous phase modulators, and relates to a three-dimensional visualization method and system for the temperature fields of double-water internal cooling synchronous phase modulators.
Background
In order to enhance reactive compensation and reactive balance in a power system, inhibit system overvoltage, improve electric energy quality and power supply reliability, the synchronous phase modulator has the technical advantages of strong short-time overload capacity, small influence of bus voltage on reactive output and capability of providing a certain rotational inertia support for an alternating current system, and is widely used in an extra-high voltage direct current transmission system.
The double-water internal cooling synchronous phase modulator can generate energy loss in the operation process, including the loss of a stator coil and a rotor coil, the loss of a stator iron core and a rotor iron core, the friction loss between an air gap and a rotor, excitation loss, mechanical loss and the like. These losses are ultimately converted into heat, which raises the temperature of the internally cooled synchronous phase modulator. Therefore, the double-water internal cooling synchronous phase modifier is often provided with a cooling system to control the temperature rise of each part within an allowable range, otherwise, the double-water internal cooling synchronous phase modifier works at an overhigh temperature for a long time to cause insulation aging, reduce the service life and burn out coils when serious, thereby causing serious accidents.
The three-dimensional virtual visualization technology is flexible, changeable, visual and effective, the phase modulation machine is used as important equipment of a transformer substation, the three-dimensional visualization technology is applied to reproduction of the internal state of the phase modulation machine, the simulation of the whole fault process of the double-water internal cooling synchronous phase modulation machine has important significance, and meanwhile, the simulation system plays an important role in operation, maintenance and overhaul.
Disclosure of Invention
In order to overcome the defects in the prior art, the application provides a method and a system for three-dimensional visualization of a temperature field of a double-water-internal-cooling synchronous phase modifier, and the three-dimensional visualization of the temperature field is realized on the basis of simulation calculation of the temperature field of the double-water-internal-cooling synchronous phase modifier.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a three-dimensional visualization method for a temperature field of a double-water internal cooling synchronous phase modulator is characterized by comprising the following steps:
the method comprises the following steps:
step 1: establishing a three-dimensional model of a double-water internal cooling synchronous phase modulator;
step 2: carrying out mesh division on a three-dimensional model of the double-water internal cooling synchronous phase modulator;
and step 3: determining material properties in a three-dimensional model of the double-water internal cooling synchronous phase modulator;
and 4, step 4: calculating exciting current and armature current of the synchronous phase modulator under different working conditions to fit a V-shaped curve of the double-water-cooled synchronous phase modulator, wherein the independent variable is the exciting current, and the dependent variable is the armature current;
and 5: calculating the heat generation rate of the double-water internal cooling synchronous phase modulator, and taking the heat generation rate as a thermal power load required by temperature field simulation;
step 6: calculating the convective heat transfer coefficients of the inner surface and the outer surface of the stator and the outer surface of the rotor and cooling air, and calculating the convective heat transfer coefficients of hollow leads in the stator coil and the rotor coil and cooling water as the simulation boundary condition of the temperature field;
and 7: simulating a temperature field of the double-water internal cooling synchronous phase modifier according to the heat generation rate obtained in the step 5 and the convective heat transfer coefficient obtained in the step 6;
and 8: establishing a functional relation of the flow rate of cooling water and the convective heat transfer coefficient between the hollow lead and the cooling water, wherein the independent variable is the flow rate of the cooling water, and the dependent variable is the convective heat transfer coefficient between the hollow lead and the cooling water;
and step 9: calculating the temperature field of the double-water internal cooling synchronous phase modifier on the basis of the completed simulation of the temperature field of the double-water internal cooling synchronous phase modifier;
step 10: and carrying out three-dimensional visual display on the temperature field of the double-water internal cooling synchronous phase modifier.
The invention further comprises the following preferred embodiments:
preferably, in the step 1, when the double-water internal cooling synchronous phase modifier three-dimensional model is established, the solid copper wire, the turn-to-turn insulation and the hollow copper wire are simplified into an integral heat conductor.
Preferably, in the step 2, the three-dimensional model of the double-water internal cooling synchronous phase modulator is subjected to grid division by adopting the maximum grid density.
Preferably, the material properties of step 3 include electrical conductivity, thermal conductivity and specific heat capacity of the material.
Preferably, in step 4, according to the two-dimensional model of the double-water-internal-cooling synchronous phase modulator, in Maxwell software, the exciting current and the armature current of the synchronous phase modulator under different working conditions are calculated in an external circuit mode, so as to fit a V-shaped curve of the double-water-internal-cooling synchronous phase modulator, wherein the independent variable is the exciting current, and the dependent variable is the armature current.
Preferably, in step 5, the heat generation rate q is calculated by the formula:
q＝P/V；
in the formula, q, P and V are respectively the heat generation rate, power loss and volume of the entity unit;
the power loss P comprises copper loss and iron loss;
wherein the iron loss is a known constant of 498 kW;
the copper consumption is divided into excitation copper consumption P generated by exciting current through copper wiresfArmature copper loss P generated by armature current passing through copper wireCu；
P of excitation copper lossfThe calculation formula is as follows:
wherein, PfNFor the excitation copper consumption under rated conditions, IFnFor rated excitation current, IfIs a variable excitation current;
armature copper loss PCuThe calculation formula of (2) is as follows:
wherein P isCuNFor armature copper loss under rated operating conditions, INIs the rated armature current.
Preferably, in step 6, the inner surface and the outer surface of the stator and the outer surface of the rotor are arranged to be radiating surfaces;
the convection heat transfer coefficients of the inner surface of the stator and the outer surface of the rotor and the cooling air are all
The heat convection coefficient between the outer surface of the stator and the cooling air is as follows:
the heat convection coefficient of the hollow lead and the cooling water is as follows:
wherein v iseIs the rotor peripheral speed, viTaking an empirical value of 5 m/s;
Nufis the Knoop coefficient of the fluid, Nuf＝0.023Re0.8Pr0.4Pr is the Plantt number, Re is the Reynolds number,
v, rho and mu are respectively the flow velocity of cooling water, the density of the cooling water and the dynamic viscosity;
λfd is the diameter of the cooling water pipe.
Preferably, in step 9, the finished double-water internal cooling synchronous phase modifier temperature field simulationOn the basis, a V-shaped curve of the double-water internal cooling synchronous phase modulator obtained by fitting in the step 4 and a function between the flow rate of cooling water and the convective heat transfer coefficient between the hollow lead and the cooling water established in the step 9 are used as built-in functions to self-define variable armature copper consumption PCuExcitation copper loss PfArmature current ICuAnd an excitation current IfThe calculation of the temperature field of the double-water internal cooling synchronous phase modifier can be carried out by inputting different exciting currents and cooling water flow rates.
Preferably, in step 10, an App developer module of COMSOL software is used for carrying out three-dimensional visual display on the temperature field of the double-water internal cooling synchronous phase modulation machine which completes the calculation of the temperature field, the definition of the variable in step 9 and the mathematical function in step 8.
The invention also discloses a three-dimensional visualization system for the temperature field of the double-water internal cooling synchronous phase modifier, which comprises the following components in percentage by weight:
the modeling module is used for establishing a three-dimensional model of the double-water internal cooling synchronous phase modulator;
the gateway division module is used for carrying out grid division on the double-water internal cooling synchronous phase modulator three-dimensional model;
the material attribute setting module is used for determining the material attribute in the double-water internal cooling synchronous phase modulator three-dimensional model;
the first calculation module is used for calculating exciting current and armature current of the synchronous phase modulator under different working conditions so as to fit a V-shaped curve of the double-water-internal-cooling synchronous phase modulator, wherein the independent variable is the exciting current, and the dependent variable is the armature current;
the second calculation module is used for calculating the heat generation rate of the double-water internal cooling synchronous phase modulator and taking the heat generation rate as a thermal power load required by temperature field simulation;
the third calculation module is used for calculating the convective heat transfer coefficients of the inner surface and the outer surface of the stator and the outer surface of the rotor and cooling air, and calculating the convective heat transfer coefficients of hollow conducting wires in the stator coil and the rotor coil and cooling water as the simulation boundary conditions of the temperature field;
the simulation module is used for simulating a temperature field of the double-water internal cooling synchronous phase modulator according to the heat generation rate and the convective heat transfer coefficient;
the function relation establishing module is used for establishing a function relation of the cooling water flow rate and the convective heat transfer coefficient between the hollow lead and the cooling water, wherein the independent variable is the cooling water flow rate, and the dependent variable is the convective heat transfer coefficient between the hollow lead and the cooling water;
the temperature field calculation module is used for calculating the temperature field of the double-water internal cooling synchronous phase modifier on the basis of the completed simulation of the temperature field of the double-water internal cooling synchronous phase modifier;
and the three-dimensional visual display module is used for carrying out three-dimensional visual display on the temperature field of the double-water internal cooling synchronous phase modifier.
The beneficial effect that this application reached:
1. the calculation speed can be improved under the condition of reflecting the temperature distribution of the double-water internal cooling synchronous phase modifier by simplifying the double-water internal cooling synchronous phase modifier model.
2. The relation between the exciting current and the armature current of the double-water internal cooling synchronous phase modifier under different operating conditions is considered, a V-shaped curve of the double-water internal cooling synchronous phase modifier is obtained through calculation through a two-dimensional simulation model, the V-shaped curve is fitted into a function relation of the exciting current and the armature current, and the function relation is used for calculating the heat generation rate of the double-water internal cooling synchronous phase modifier under different operating conditions, so that an operator can automatically calculate the corresponding armature current only by inputting the exciting current and calculate the corresponding armature loss and the corresponding exciting loss.
3. Under the condition that the temperature field of the double-water internal cooling synchronous phase modifier is obtained through simulation, the exciting current and the cooling water flow rate are used as independent variables, the temperature field of the double-water internal cooling synchronous phase modifier under the input is calculated according to the input of personnel, and an App (application program) developer of COMSOL (complementary metal oxide semiconductor) soft armor is adopted to complete the development of three-dimensional visual software for the double-water internal cooling synchronous phase modifier. Namely, the function application model of the heat source enables the heat source application to be simpler, and only the armature current of the double-water internal cooling synchronous phase modulator needs to be input; the function model of the heat dissipation coefficient under different cooling water flow rates enables the calculation of the temperature field under different cooling water flow rates.
Drawings
FIG. 1 is a flow chart of a three-dimensional visualization method for a temperature field of a double-water internal cooling synchronous phase modifier;
FIG. 2 is an overall simplified three-dimensional model of the dual-water internal cooling synchronous phase modulator designed by the invention;
FIG. 3 is a simplified three-dimensional model of the dual-water internal cooling synchronous phase modulator;
fig. 4 is a three-dimensional visual interface diagram of the temperature field of the double-water internal cooling synchronous phase modifier, which is shown as a stator part.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
As shown in figure 1, the three-dimensional visualization method for the temperature field of the double-water internal cooling synchronous phase modifier comprises the following steps:
step 1: according to the actual physical structure and heat transfer principle of the double-water internal cooling synchronous phase modifier, a three-dimensional model of the double-water internal cooling synchronous phase modifier is established.
The invention establishes a simplified three-dimensional model of a double-water internal cooling synchronous phase modulator, and performs equivalent treatment on cooling water in the form of convective heat transfer coefficient.
When a double-water internal cooling synchronous phase modifier three-dimensional model is established, a part of heat conductors are simplified into an integral heat conductor, and a simplified simulation model is obtained;
the heat conductor before simplification comprises a stator, a rotor, a solid copper conductor, main insulation, turn-to-turn insulation, a hollow copper conductor and cooling water;
the solid copper wire, the interturn insulation and the hollow copper wire are simplified into an integral heat conductor.
As shown in fig. 2, when a three-dimensional model of the double-water internal cooling synchronous phase modulator is established, a simplified processing mode is adopted, wherein 1 refers to a stator core, and 2 refers to a rotor core;
as shown in fig. 2, (1) is a stator and rotor insulation part and a lead, (2) is a simplified stator and rotor insulation part and a lead, 3 is a simplified stator and rotor insulation part, and 4 is a simplified lead;
step 2: the double-water internal cooling synchronous phase modifier three-dimensional model is subjected to grid division by adopting low density, namely when grid division is carried out in software, the maximum grid density division is selected, so that the grid number is reduced as much as possible, and the calculation speed is ensured.
And step 3: determining the material properties of each part in the double-water internal cooling synchronous phase modulator three-dimensional model, including the electrical conductivity, the thermal conductivity coefficient and the specific heat capacity of the material.
On the premise of determining the material properties of the double-water internal cooling synchronous phase modulator system, the material properties are set in the established double-water internal cooling synchronous phase modulator three-dimensional model.
And 4, step 4: according to a two-dimensional model of the double-water internal cooling synchronous phase modulator, in Maxwell software, the form of an external circuit is adopted, the exciting current and the armature current of the synchronous phase modulator under different working conditions are calculated, and a V-shaped curve of the double-water internal cooling synchronous phase modulator is fitted, wherein the independent variable is the exciting current, and the dependent variable is the armature current;
and 5: and calculating the heat generation rate of the double-water internal cooling synchronous phase modulator, and taking the heat generation rate as the thermal power load required by the temperature field simulation.
When the double-water internal cooling synchronous phase modulator operates, the exciting wire and the armature wire can generate copper loss due to the current flowing through the exciting wire and the armature wire, namely the exciting current passes through the copper wire and the armature current passes through the copper wire to generate the copper loss PCuThe rotor and stator generating iron loss PFeFurther, the heat generation rate of the double-water internal cooling synchronous phase modifier can be obtained.
The heat generation rate is defined as the heat loss per unit volume, the heat loss is loaded on the corresponding entity unit of the temperature field in a heat generation rate mode, and the heat generation rate q is calculated by the formula:
q＝P/V；
in the formula, q, P and V are respectively the heat generation rate, power loss and volume of the entity unit;
the power loss P is copper loss and iron loss respectively;
wherein the iron loss is a known constant of 498 kW;
the copper consumption is divided into excitation copper consumption P generated by exciting current through copper wiresfAnd armature current flowArmature copper loss P generated by copper-passing wireCu；
P of excitation copper lossfThe calculation formula is as follows:
wherein, PfNThe excitation copper consumption under rated working condition is 796kW, IFnIs rated exciting current 1835A, IfIs a variable excitation current;
armature copper loss PCuThe calculation formula of (2) is as follows:
wherein P isCuN491kW, I armature copper consumption under rated working conditionNIs the nominal armature current 8660A.
Step 6: the accurate calculation of the convective heat transfer coefficient between the double-water internal cooling synchronous phase modifier and the surrounding environment is the key for simulating the temperature field of the double-water internal cooling synchronous phase modifier, when the double-water internal cooling synchronous phase modifier operates, the rotor rotates to drive the end fan to rotate, so that convective heat transfer exists between the inner surface of the stator and the outer surface of the rotor, convective heat transfer exists between the hollow wires in the stator coil and the rotor coil and cooling water, the wind speed of the cooling air and the flow rate of the cooling water are determined according to the heat transfer theory, the convective heat transfer coefficients between the inner surface of the stator, the outer surface of the stator and the outer surface of the rotor and the cooling air are calculated, and the convective heat transfer coefficients between the hollow wires in the stator coil and the rotor coil and the cooling water are.
The convective heat transfer coefficient of the inner surface of the stator is approximately equal to the convective heat transfer coefficient of the outer surface of the rotor.
The inner surface and the outer surface of the stator and the outer surface of the rotor are arranged as radiating surfaces,
the convection heat transfer coefficients of the inner surface of the stator and the outer surface of the rotor and the cooling air are all
Convection heat exchange system for outer surface of stator and cooling airThe number is as follows:
veis the rotor peripheral speed, viAn empirical value of 5m/s was taken.
The heat convection coefficient of the hollow lead and the cooling water is as follows:
wherein N isuf＝0.023Re0.8Pr0.4，
NufIs the Knoop coefficient of the fluid, λfThe coefficient of heat conductivity of the fluid is shown, d is the diameter of a cooling water pipeline, Pr is a Plantt number, Re is a Reynolds number, and v, rho and mu are respectively the flow rate of the cooling water, the density of the cooling water and the dynamic viscosity; .
And 7: according to the heat generation rate and the heat convection coefficient, excitation is set in COMSOL software, namely, the thermal power load required by simulation is as follows: simulating the heat generation rate and the boundary condition, namely the convective heat transfer coefficient to obtain the temperature field of the double-water internal cooling synchronous phase modulator;
and 8: according to the theory of heat transfer science, establishing a functional relation between the flow rate of cooling water and the convective heat transfer coefficient between the hollow lead and the cooling water, wherein the independent variable is the flow rate of the cooling water, and the dependent variable is the convective heat transfer coefficient between the hollow lead and the cooling water;
and step 9: calculating the temperature field of the double-water internal cooling synchronous phase modifier on the basis of the completed simulation of the temperature field of the double-water internal cooling synchronous phase modifier;
on the basis of the completed simulation of the temperature field of the double-water internal cooling synchronous phase modulator, the V-shaped curve of the double-water internal cooling synchronous phase modulator obtained by fitting in the step 4 and the function between the flow rate of cooling water and the convective heat transfer coefficient between the hollow lead and the cooling water established in the step 9 are taken as a built-in function and a self-defined variable by utilizing COMSOL software: armature copper loss PCuExcitation copper loss PfArmature current ICuAnd an excitation current IfAs shown in fig. 4, the temperature field of the dual-water internal cooling synchronous phase modulator can be calculated by inputting different exciting currents and cooling water flow rates.
Step 10: and (3) carrying out three-dimensional visual display on the temperature field of the double-water internal cooling synchronous phase modifier which is completed with temperature field calculation, definition variables and mathematical functions by utilizing an App developer module of COMSOL software.
The invention discloses a three-dimensional visualization system for a temperature field of a double-water internal cooling synchronous phase modifier, which comprises:
the modeling module is used for establishing a three-dimensional model of the double-water internal cooling synchronous phase modulator;
the gateway division module is used for carrying out grid division on the double-water internal cooling synchronous phase modulator three-dimensional model;
the material attribute setting module is used for determining the material attribute in the double-water internal cooling synchronous phase modulator three-dimensional model;
the first calculation module is used for calculating exciting current and armature current of the synchronous phase modulator under different working conditions so as to fit a V-shaped curve of the double-water-internal-cooling synchronous phase modulator, wherein the independent variable is the exciting current, and the dependent variable is the armature current;
the second calculation module is used for calculating the heat generation rate of the double-water internal cooling synchronous phase modulator and taking the heat generation rate as a thermal power load required by temperature field simulation;
the third calculation module is used for calculating the convective heat transfer coefficients of the inner surface and the outer surface of the stator and the outer surface of the rotor and cooling air, and calculating the convective heat transfer coefficients of hollow conducting wires in the stator coil and the rotor coil and cooling water as the simulation boundary conditions of the temperature field;
the simulation module is used for simulating a temperature field of the double-water internal cooling synchronous phase modulator according to the heat generation rate and the convective heat transfer coefficient;
the function relation establishing module is used for establishing a function relation of the cooling water flow rate and the convective heat transfer coefficient between the hollow lead and the cooling water, wherein the independent variable is the cooling water flow rate, and the dependent variable is the convective heat transfer coefficient between the hollow lead and the cooling water;
the temperature field calculation module is used for calculating the temperature field of the double-water internal cooling synchronous phase modifier on the basis of the completed simulation of the temperature field of the double-water internal cooling synchronous phase modifier;
and the three-dimensional visual display module is used for carrying out three-dimensional visual display on the temperature field of the double-water internal cooling synchronous phase modifier.
The invention simplifies the body model of the double-water internal cooling synchronous phase modulator, and has excellent App migration performance; the function application model of the heat source enables the application of the heat source to be simpler, and only the armature current of the double-water internal cooling synchronous phase modulator needs to be input; the function of the heat dissipation coefficient under different cooling water flow rates makes it possible to calculate the temperature fields under different cooling water flow rates. The invention can realize the simplified calculation of the temperature field of the double-water internal cooling synchronous phase modifier, and the model interface is more concise, so that non-professional personnel can also complete the calculation and the setting of the temperature field of the double-water internal cooling synchronous phase modifier.
The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (10)
1. A three-dimensional visualization method for a temperature field of a double-water internal cooling synchronous phase modulator is characterized by comprising the following steps:
the method comprises the following steps:
step 1: establishing a three-dimensional model of a double-water internal cooling synchronous phase modulator;
step 2: carrying out mesh division on a three-dimensional model of the double-water internal cooling synchronous phase modulator;
and step 3: determining material properties in a three-dimensional model of the double-water internal cooling synchronous phase modulator;
and 4, step 4: calculating exciting current and armature current of the synchronous phase modulator under different working conditions to fit a V-shaped curve of the double-water-cooled synchronous phase modulator, wherein the independent variable is the exciting current, and the dependent variable is the armature current;
and 5: calculating the heat generation rate of the double-water internal cooling synchronous phase modulator, and taking the heat generation rate as a thermal power load required by temperature field simulation;
step 6: calculating the convective heat transfer coefficients of the inner surface and the outer surface of the stator and the outer surface of the rotor and cooling air, and calculating the convective heat transfer coefficients of hollow leads in the stator coil and the rotor coil and cooling water as the simulation boundary condition of the temperature field;
and 7: simulating a temperature field of the double-water internal cooling synchronous phase modifier according to the heat generation rate obtained in the step 5 and the convective heat transfer coefficient obtained in the step 6;
and 8: establishing a functional relation of the flow rate of cooling water and the convective heat transfer coefficient between the hollow lead and the cooling water, wherein the independent variable is the flow rate of the cooling water, and the dependent variable is the convective heat transfer coefficient between the hollow lead and the cooling water;
and step 9: calculating the temperature field of the double-water internal cooling synchronous phase modifier on the basis of the completed simulation of the temperature field of the double-water internal cooling synchronous phase modifier;
step 10: and carrying out three-dimensional visual display on the temperature field of the double-water internal cooling synchronous phase modifier.
2. The three-dimensional visualization method for the temperature field of the double-water-internal-cooling synchronous phase modifier according to claim 1, characterized in that:
in the step 1, when a three-dimensional model of the double-water internal cooling synchronous phase modulator is established, a solid copper wire, an interturn insulation wire and a hollow copper wire are simplified into an integral heat conductor.
3. The three-dimensional visualization method for the temperature field of the double-water-internal-cooling synchronous phase modifier according to claim 1, characterized in that:
and 2, performing grid division on the three-dimensional model of the double-water internal cooling synchronous phase modulator by adopting the maximum grid density.
4. The three-dimensional visualization method for the temperature field of the double-water-internal-cooling synchronous phase modifier according to claim 1, characterized in that:
and 3, the material properties comprise the electrical conductivity, the thermal conductivity and the specific heat capacity of the material.
5. The three-dimensional visualization method for the temperature field of the double-water-internal-cooling synchronous phase modifier according to claim 1, characterized in that:
and 4, calculating the exciting current and the armature current of the synchronous phase modulator under different working conditions in Maxwell software in an external circuit mode according to the two-dimensional model of the double-water-internal-cooling synchronous phase modulator to fit a V-shaped curve of the double-water-internal-cooling synchronous phase modulator, wherein the independent variable is the exciting current, and the dependent variable is the armature current.
6. The three-dimensional visualization method for the temperature field of the double-water-internal-cooling synchronous phase modifier according to claim 1, characterized in that:
in step 5, the heat generation rate q is calculated by the formula:
q＝P/V；
in the formula, q, P and V are respectively the heat generation rate, power loss and volume of the entity unit;
the power loss P comprises copper loss and iron loss;
wherein the iron loss is a known constant of 498 kW;
the copper consumption is divided into excitation copper consumption P generated by exciting current through copper wiresfArmature copper loss P generated by armature current passing through copper wireCu；
P of excitation copper lossfThe calculation formula is as follows:
wherein, PfNFor the excitation copper consumption under rated conditions, IFnFor rated excitation current, IfIs a variable excitation current;
armature copper loss PCuThe calculation formula of (2) is as follows:
wherein P isCuNIs a foreheadArmature copper loss under constant operating conditions, INIs the rated armature current.
7. The three-dimensional visualization method for the temperature field of the double-water-internal-cooling synchronous phase modifier according to claim 1, characterized in that:
in step 6, setting the inner surface and the outer surface of the stator and the outer surface of the rotor as radiating surfaces;
the convection heat transfer coefficients of the inner surface of the stator and the outer surface of the rotor and the cooling air are all
The heat convection coefficient between the outer surface of the stator and the cooling air is as follows:
the heat convection coefficient of the hollow lead and the cooling water is as follows:
wherein v iseIs the rotor peripheral speed, viTaking an empirical value of 5 m/s;
Nufis the Knoop coefficient of the fluid, Nuf＝0.023Re0.8Pr0.4Pr is the Plantt number, Re is the Reynolds number,
v, rho and mu are respectively the flow velocity of cooling water, the density of the cooling water and the dynamic viscosity;
λfd is the diameter of the cooling water pipe.
8. The three-dimensional visualization method for the temperature field of the double-water-internal-cooling synchronous phase modifier according to claim 1, characterized in that:
in step 9, on the basis of the completed simulation of the temperature field of the double-water internal cooling synchronous phase modulator, the double water internal cooling synchronous phase modulator obtained by the step 4 is fittedThe V-shaped curve of the cold synchronous phase modulator and the function between the flow rate of the cooling water and the convective heat transfer coefficient between the hollow conductor and the cooling water established in the step 9 are used as built-in functions to customize the variable armature copper consumption PCuExcitation copper loss PfArmature current ICuAnd an excitation current IfThe calculation of the temperature field of the double-water internal cooling synchronous phase modifier can be carried out by inputting different exciting currents and cooling water flow rates.
9. The three-dimensional visualization method for the temperature field of the double-water-internal-cooling synchronous phase modifier according to claim 1, characterized in that:
in step 10, an App developer module of COMSOL software is used for carrying out three-dimensional visual display on the temperature field of the double-water internal cooling synchronous phase modifier which finishes the calculation of the temperature field, the definition of variables in step 9 and the mathematical function in step 8.
10. The double-internal-water-cooling synchronous phase modifier temperature field three-dimensional visualization system of the double-internal-water-cooling synchronous phase modifier temperature field three-dimensional visualization method according to any one of claims 1 to 9, characterized in that:
the system comprises:
the modeling module is used for establishing a three-dimensional model of the double-water internal cooling synchronous phase modulator;
the gateway division module is used for carrying out grid division on the double-water internal cooling synchronous phase modulator three-dimensional model;
the material attribute setting module is used for determining the material attribute in the double-water internal cooling synchronous phase modulator three-dimensional model;
the first calculation module is used for calculating exciting current and armature current of the synchronous phase modulator under different working conditions so as to fit a V-shaped curve of the double-water-internal-cooling synchronous phase modulator, wherein the independent variable is the exciting current, and the dependent variable is the armature current;
the second calculation module is used for calculating the heat generation rate of the double-water internal cooling synchronous phase modulator and taking the heat generation rate as a thermal power load required by temperature field simulation;
the third calculation module is used for calculating the convective heat transfer coefficients of the inner surface and the outer surface of the stator and the outer surface of the rotor and cooling air, and calculating the convective heat transfer coefficients of hollow conducting wires in the stator coil and the rotor coil and cooling water as the simulation boundary conditions of the temperature field;
the simulation module is used for simulating a temperature field of the double-water internal cooling synchronous phase modulator according to the heat generation rate and the convective heat transfer coefficient;
the function relation establishing module is used for establishing a function relation of the cooling water flow rate and the convective heat transfer coefficient between the hollow lead and the cooling water, wherein the independent variable is the cooling water flow rate, and the dependent variable is the convective heat transfer coefficient between the hollow lead and the cooling water;
the temperature field calculation module is used for calculating the temperature field of the double-water internal cooling synchronous phase modifier on the basis of the completed simulation of the temperature field of the double-water internal cooling synchronous phase modifier;
and the three-dimensional visual display module is used for carrying out three-dimensional visual display on the temperature field of the double-water internal cooling synchronous phase modifier.
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