CN112954944A - Vehicle-mounted converter thermal management system and method and vehicle-mounted converter - Google Patents
Vehicle-mounted converter thermal management system and method and vehicle-mounted converter Download PDFInfo
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- CN112954944A CN112954944A CN201911171453.XA CN201911171453A CN112954944A CN 112954944 A CN112954944 A CN 112954944A CN 201911171453 A CN201911171453 A CN 201911171453A CN 112954944 A CN112954944 A CN 112954944A
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 95
- 230000017525 heat dissipation Effects 0.000 claims abstract description 50
- 239000000110 cooling liquid Substances 0.000 claims abstract description 43
- 239000000758 substrate Substances 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 83
- 238000007726 management method Methods 0.000 claims description 33
- 239000002826 coolant Substances 0.000 claims description 4
- 238000004422 calculation algorithm Methods 0.000 claims description 3
- 230000010354 integration Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 230000005855 radiation Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 7
- 230000003137 locomotive effect Effects 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 3
- 238000013021 overheating Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000002076 thermal analysis method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20845—Modifications to facilitate cooling, ventilating, or heating for automotive electronic casings
- H05K7/20863—Forced ventilation, e.g. on heat dissipaters coupled to components
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20845—Modifications to facilitate cooling, ventilating, or heating for automotive electronic casings
- H05K7/20872—Liquid coolant without phase change
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20909—Forced ventilation, e.g. on heat dissipaters coupled to components
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20927—Liquid coolant without phase change
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Abstract
According to the vehicle-mounted converter heat management system, the method and the vehicle-mounted converter, the controller can determine the required heat dissipation amount when the substrate of the water-cooled radiator is reduced to the proper working temperature by calculating the total heat generated by the IGBT device and the circulating heat dissipation amount of the cooling liquid, a power supply control signal is determined according to the required heat dissipation amount, the controller controls the variable frequency power supply according to the power supply control signal, and the rotating speed of the heat dissipation fan is controlled through the variable frequency power supply. The rotating speed of the heat radiating fan is controlled according to the required heat radiation quantity of the IGBT device, so that the temperature of the water-cooled radiator substrate can be controlled more accurately and effectively, the phenomenon that the working temperature of the IGBT device is too low or too high due to excessive cooling or poor cooling effect is avoided, and the working characteristics of the IGBT and the working reliability of the vehicle-mounted converter are guaranteed.
Description
Technical Field
The invention relates to the technical field of railway locomotives and motor train units, in particular to a thermal management system and method of a vehicle-mounted converter and the vehicle-mounted converter.
Background
The vehicle-mounted converter is one of the most critical devices of a railway locomotive and a motor train unit, is a power source for traction operation of a train, and the reliability of the vehicle-mounted converter plays a decisive role in safe and punctual operation of the train. How the vehicle-mounted converter can better adapt to the extremely large temperature difference range in China, and the technical level of a heat dissipation system of the vehicle-mounted converter plays an extremely important decisive role.
At present, the vehicle-mounted converter of the locomotive and the motor train unit in China still adopts a water-cooling heat dissipation system with simple temperature control, the vehicle-mounted converter generally adopts Insulated Gate Bipolar Transistors (IGBT) as a high-power electronic device, the IGBT can generate a large amount of heat during working due to power consumption of the IGBT, the internal temperature of the IGBT can rapidly rise, if the internal heat of the IGBT can not be timely dissipated, the IGBT can continuously heat up, the IGBT can fail due to overheating, and the working reliability of the vehicle-mounted converter is influenced.
The existing vehicle-mounted converter cools cooling water in the converter through a cooling fan, wherein the cooling fan is generally powered by a power frequency power supply with fixed frequency, the rotating speed of the cooling fan cannot be adjusted, and the cooling fan can only be controlled to be in two working states of starting and stopping. When the converter works, the cooling fan is always in a full-speed running state, when the temperature of a radiator in the vehicle-mounted converter exceeds a normal range, the vehicle-mounted converter gives an overheat alarm to trigger an overheat protection action, and the vehicle-mounted converter stops working immediately.
In the prior art, the internal temperature of the converter is reduced by the cooling fan in a full-speed operation mode, the internal temperature of the converter is excessively cooled when the cooling fan is applied in a low-temperature environment, particularly in low-temperature conditions in winter, the temperature of a substrate of an IGBT radiator frequently fluctuates in a large temperature range along with the frequent work of a locomotive and a motor train unit under complex working conditions such as starting, braking, ascending, descending and the like, and the IGBT is easily failed due to frequent wide-range thermal circulation.
Disclosure of Invention
The invention aims to provide a vehicle-mounted converter thermal management system and method and a vehicle-mounted converter, and aims to solve the problem that the internal temperature of the converter in the prior art is excessively cooled.
In a first aspect, the present invention provides a thermal management system for a vehicle-mounted converter, including:
the device comprises a water tank, a water-cooled radiator substrate for cooling the IGBT device of the converter, a cooling tower, a variable frequency power supply, a radiating fan for cooling the IGBT device of the converter, a water inlet temperature sensor, a water outlet temperature sensor, an environment temperature sensor and a controller;
the water tank is connected to the water inlet of the water-cooling radiator base plate through a water pump, the water outlet of the water-cooling radiator base plate is connected with the water inlet of the cooling tower through a pipeline, and the water outlet of the cooling tower is connected with the water tank through a pipeline; the water tank is filled with cooling liquid, the cooling liquid flows into the water-cooled radiator substrate through the water pump to be subjected to liquid cooling, the heated cooling liquid flows into the cooling tower to be cooled, and the cooled cooling liquid flows back into the water tank;
the water inlet temperature sensor and the water outlet temperature sensor are respectively arranged at the water inlet and the water outlet of the water-cooling radiator substrate; the environment temperature sensor is arranged on the water-cooling radiator substrate and used for measuring the internal environment temperature of the vehicle-mounted converter;
the water inlet temperature sensor, the water outlet temperature sensor and the environment temperature sensor are all connected with the controller, the controller is also connected with the variable frequency power supply, and the variable frequency power supply is used for supplying power to the cooling fan;
the controller obtains the working current and the working voltage of the IGBT device to obtain the total heat generated by the IGBT device; the controller calculates the circulating heat dissipation capacity of the cooling liquid according to the water inlet temperature and the water outlet temperature of the water-cooled radiator substrate detected by the water inlet temperature sensor and the water outlet temperature sensor;
the controller determines a power supply control signal according to the total heat generated by the IGBT device, the circulating heat dissipation capacity of the cooling liquid and the environment temperature detected by the environment temperature sensor;
the controller controls the variable frequency power supply according to the power supply control signal so as to control the rotating speed of the cooling fan through the variable frequency power supply.
In one possible design, the controller obtains the operating current and the operating voltage of the IGBT device, and obtains the total heat generated by the IGBT device, including:
the controller determines the power consumption of the IGBT device according to the working current and the working voltage of the IGBT device;
the controller determines the total heat generated by the IGBT device according to the power consumption of the IGBT device.
In one possible design, the controller determines the power consumption of the IGBT device based on the operating current and the operating voltage of the IGBT device, including:
and the controller determines the power consumption of the IGBT device through an integration algorithm according to the working current and the working voltage of the IGBT device.
In one possible design, the controller determines the total heat generated by the IGBT device based on the power consumption of the IGBT device, including:
the controller establishes a thermal resistance model of the water-cooling radiator through simulation software;
and the controller calculates the total heat generated by the IGBT device through the thermal resistance model according to the power consumption of the IGBT device.
In one possible design, the controller determines the power control signal according to the total heat generated by the IGBT device, the circulating heat dissipation amount of the coolant, and the ambient temperature detected by the ambient temperature sensor, and includes:
the controller determines the junction temperature of the IGBT device according to the total heat generated by the IGBT device, the circulating heat dissipation capacity of cooling liquid and the ambient temperature detected by the ambient temperature sensor;
and the controller determines a power supply control signal according to the junction temperature of the IGBT device.
In one possible design, the power control signal is a power frequency;
the controller determines a power supply control signal according to the junction temperature of the IGBT device, and the method comprises the following steps:
when the junction temperature of the IGBT device exceeds the maximum value of the suitable temperature interval of the IGBT device, the controller controls the power supply frequency to increase;
the controller is according to power control signal control variable frequency power supply to through variable frequency power supply the control cooling blower's rotational speed, include:
when the power supply frequency is increased, the controller controls the rotating speed of the cooling fan to increase through the variable frequency power supply.
In one possible design, the controller determines the power supply control signal according to the junction temperature of the IGBT device, and further includes:
when the junction temperature of the IGBT device is lower than the minimum value of the suitable temperature interval of the IGBT device, the controller controls the power supply frequency to be reduced;
the controller is according to power control signal control variable frequency power supply to through variable frequency power supply the control cooling blower's rotational speed, include:
when the power supply frequency is reduced, the controller controls the rotating speed of the cooling fan to be reduced through the variable frequency power supply.
In one possible design, the controller includes an embedded system and hardware circuitry.
In a second aspect, an embodiment of the present invention provides an on-vehicle converter thermal management method, which is applied to any one of the on-vehicle converter thermal management systems in the first aspect, and includes:
the controller obtains the working current and the working voltage of the IGBT device to obtain the total heat generated by the IGBT device; the controller calculates the circulating heat dissipation capacity of the cooling liquid according to the water inlet temperature and the water outlet temperature of the water-cooled radiator substrate detected by the water inlet temperature sensor and the water outlet temperature sensor;
the controller determines a power supply control signal according to the total heat generated by the IGBT device, the circulating heat dissipation capacity of the cooling liquid and the environment temperature detected by the environment temperature sensor;
the controller controls the variable frequency power supply according to the power supply control signal so as to control the rotating speed of the cooling fan through the variable frequency power supply.
In a second aspect, an embodiment of the present invention provides an onboard converter, which is characterized by being applied to any one of the onboard converter thermal management systems in the first aspect.
According to the vehicle-mounted converter heat management system, the vehicle-mounted converter heat management method and the vehicle-mounted converter, the controller can determine the required heat dissipation amount by calculating the total heat generated by the IGBT device and the circulating heat dissipation amount of the cooling liquid, a power supply control signal is determined according to the required heat dissipation amount, and the controller controls the variable frequency power supply according to the power supply control signal so as to control the rotating speed of the heat dissipation fan through the variable frequency power supply. The rotating speed of the heat radiating fan is controlled according to the required heat radiation quantity of the IGBT device, so that the temperature of the IGBT device can be more accurately and effectively reduced, the phenomenon that the working temperature of the IGBT device is too low or too high due to excessive cooling or poor cooling effect is avoided, and the working characteristics of the IGBT and the working reliability of the vehicle-mounted converter are guaranteed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic structural diagram of a thermal management system of a vehicle-mounted converter according to an embodiment of the present invention;
fig. 2 is a first flowchart of a thermal management method for a vehicle-mounted converter according to an embodiment of the present invention;
fig. 3 is a flowchart of a second method for thermal management of a vehicle-mounted converter according to an embodiment of the present invention.
Detailed Description
With the above figures, certain embodiments of the invention have been illustrated and described in more detail below. The drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate it by those skilled in the art with reference to specific embodiments.
The embodiment of the invention provides a vehicle-mounted converter heat management system, which adopts an active heat management idea, creates a more comfortable working temperature environment for an IGBT device through a more reasonable water temperature control strategy and a more precise temperature sensor, enables the IGBT to work at the temperature of about 40 ℃ of a radiator substrate for a long time as far as possible, and avoids the IGBT from working at wide thermal cycle for a long time, so that the reliability of the vehicle-mounted converter is greatly improved, and important evaluation basis in the aspects of performance evaluation, health state evaluation, device service life optimization and the like of the IGBT device can be provided for a health management system of a locomotive and a motor train unit.
Fig. 1 is a schematic structural diagram of a thermal management system of an onboard converter according to an embodiment of the present invention, as shown in fig. 1: the vehicle-mounted converter thermal management system architecture in the embodiment of the invention comprises: the system comprises a water tank 101, a water-cooled radiator base plate 102, a cooling tower 103, a variable frequency power supply 104, a cooling fan 105, a water inlet temperature sensor 106, a water outlet temperature sensor 107, an ambient temperature sensor 108 and a controller 109.
A water tank 101 is connected to a water inlet of the water-cooling radiator base plate 102 through a water pump, a water outlet of the water-cooling radiator base plate 102 is connected with a water inlet of the cooling tower 103 through a pipeline, and a water outlet of the cooling tower 103 is connected with the water tank 101 through a pipeline;
the water tank 101 stores cooling liquid, the cooling liquid flows into the water-cooling radiator base plate 102 through a water pump to be cooled, the heated cooling liquid flows into the cooling tower 103 to be cooled, and the cooled cooling liquid flows back into the water tank 101.
A water inlet temperature sensor 106 and a water outlet temperature sensor 107 are respectively arranged at the water inlet and the water outlet of the water-cooling radiator substrate 102; the environment temperature sensor 108 is arranged on the water-cooling radiator base plate 102 and used for measuring the internal environment temperature of the vehicle-mounted converter; the water inlet temperature sensor 106, the water outlet temperature sensor 107 and the environment temperature sensor 1088 are all connected with the controller 109, the controller 109 is further connected with the variable frequency power supply 104, and the variable frequency power supply 104 is used for supplying power to the cooling fan 105.
The water-cooled heat sink base plate 102 is cooled by a cooling liquid circulation system and a heat sink. The coolant circulation system continuously cools the water-cooled radiator substrate 102 in the running process of the vehicle-mounted converter, and if the working current or the working voltage of the IGBT device is too high, so that the heat generated by the IGBT device in a short time is too large, the controller correspondingly increases the frequency of a power supply control signal according to the calculated circulating heat dissipation capacity increase range, controls the variable frequency power supply to drive the cooling fan to increase the rotating speed, and utilizes the direct-blowing air of the cooling fan to quickly reduce the temperature of the water-cooled radiator substrate 102.
Fig. 2 is a first flowchart of a thermal management method for a vehicle-mounted converter according to an embodiment of the present invention. The execution subject of the method of the embodiment may be the controller in fig. 1, and as shown in fig. 2, the thermal management method for the vehicle-mounted converter includes the following steps:
s21: the controller obtains the working current and the working voltage of the IGBT device to obtain the total heat generated by the IGBT device.
The controller can obtain the heat generated by the IGBT device in the period of time according to the working current and the working voltage of the IGBT device and the duration time, and the current working state of the IGBT device can be estimated according to the heat generated by the IGBT device.
S22: and the controller calculates the circulating heat dissipation capacity of the cooling liquid according to the water inlet temperature and the water outlet temperature of the water-cooled radiator substrate detected by the water inlet temperature sensor and the water outlet temperature sensor.
The circulation process of the cooling liquid is that the cooling liquid enters from a water inlet of the water-cooled radiator substrate, the water-cooled radiator substrate is cooled through the cooling liquid, the temperature of the cooling liquid rises in the cooling process, and the cooling liquid with the raised temperature flows out from a water outlet of the water-cooled radiator substrate. The controller can determine the temperature difference of the cooling liquid in the cooling process according to the temperature of the cooling liquid detected by the water inlet temperature sensor and the temperature of the water outlet detected by the water outlet temperature sensor, and the controller can obtain the heat dissipation capacity of the cooling liquid through the temperature difference of the cooling liquid and the flow of the cooling liquid, namely the heat of the water-cooled radiator substrate taken away by the cooling liquid.
S23: the controller determines a power supply control signal according to the total heat generated by the IGBT device, the circulating heat dissipation capacity of the cooling liquid and the environment temperature detected by the environment temperature sensor.
The controller can determine the required heat dissipation amount when the substrate of the water-cooled radiator is reduced to the proper working temperature according to the total heat generated by the IGBT device and the circulating heat dissipation amount of the cooling liquid, and determine the magnitude of the power supply control signal according to the required heat dissipation amount.
S24: the controller controls the variable frequency power supply according to the power supply control signal so as to control the rotating speed of the cooling fan through the variable frequency power supply.
The variable frequency power supply controls the voltage of the output variable frequency power supply according to the received power supply control signal, and the cooling fan controls the rotating speed according to the received voltage of the variable frequency power supply.
From the embodiment, the controller can determine the required heat dissipation amount when the substrate of the water-cooled radiator is reduced to the proper working temperature by calculating the total heat generated by the IGBT device and the circulating heat dissipation amount of the cooling liquid, determine the power supply control signal according to the required heat dissipation amount, control the variable frequency power supply according to the power supply control signal, and control the rotating speed of the heat dissipation fan through the variable frequency power supply. The rotating speed of the heat radiating fan is controlled according to the required heat radiation quantity of the IGBT device, so that the temperature of the water-cooled radiator substrate can be controlled more accurately and effectively, the phenomenon that the working temperature of the IGBT device is too low or too high due to excessive cooling or poor cooling effect is avoided, and the working characteristics of the IGBT and the working reliability of the vehicle-mounted converter are guaranteed.
In an embodiment of the present invention, the obtaining, by the controller, the operating current and the operating voltage of the IGBT device to obtain the total heat generated by the IGBT device includes: the controller determines the power consumption of the IGBT device according to the working current and the working voltage of the IGBT device, and the controller determines the total heat generated by the IGBT device according to the power consumption of the IGBT device.
The power consumption of the IGBT device is related to the working current and the working voltage of the IGBT device, and the power consumption of the IGBT device can be determined through the working current and the working voltage of the IGBT device. The total heat generated by the IGBT device is related to the power consumption of the IGBT device, and the total heat generated by the IGBT device can be determined through the power consumption of the IGBT device.
According to the embodiment, the working state of the IGBT device can be estimated by obtaining the total heat generated by the IGBT device, and if the total heat generated by the IGBT device is too high, the temperature of the water-cooling radiator substrate is too high, so that the IGBT device cannot work in a proper temperature environment, and the working characteristics of the IGBT device are influenced. Therefore, whether the cooling function of the cooling fan needs to be started or not can be judged according to the temperature of the water-cooling radiator substrate, the temperature of the IGBT device is reduced in time, and the working characteristics of the IGBT device and the working reliability of the vehicle-mounted converter are guaranteed.
In one embodiment of the invention, the controller determines the power consumption of the IGBT device through an integration algorithm based on the operating current and the operating voltage of the IGBT device.
The controller continuously receives information about the working current, the working voltage and the like of the IGBT device through data communication, and the real-time power consumption of the IGBT device can be determined by adopting time integral calculation. If the working current and the working voltage of the current IGBT device are higher, the real-time power consumption of the IGBT device is large, the heat dissipation capacity of the IGBT device is also higher, and the temperature of the substrate of the water-cooling radiator is overhigh. If cooling measures are not taken in time, the temperature of the water-cooling radiator substrate and the temperature of the IGBT device are timely reduced, the temperature of the IGBT device can be continuously increased, the IGBT device is enabled to lose effectiveness due to overheating, and the working reliability of the vehicle-mounted converter is affected.
According to the embodiment, the heat dissipation capacity of the IGBT device in the working state is related to the real-time power consumption of the IGBT device, so that the real-time power consumption of the IGBT device can be determined by obtaining the working characteristics of the IGBT device through the controller, the working state of the current IGBT device can be determined in time by determining the real-time power consumption of the IGBT device, cooling measures can be taken in time, the temperature of the IGBT device is reduced, and the working reliability of the vehicle-mounted converter is guaranteed.
In one embodiment of the invention, the controller determines the total heat generated by the IGBT device according to the power consumption of the IGBT device, and comprises the following steps:
the controller establishes a thermal resistance model of the water-cooling radiator through simulation software; and the controller calculates the total heat generated by the IGBT device through a thermal resistance model according to the power consumption of the IGBT device.
The controller establishes a thermal resistance model of the water-cooling radiator assembled by the IGBT and the radiator substrate by using thermal simulation software such as FloEFD or ICEPAK and the like, carrying out gridded flow field analysis and thermal analysis on the combination of the substrate of the water-cooling radiator and the IGBT, and combining data correction of simulation calculation and experimental verification.
From the above embodiments, the nonlinear relationship between the power consumption of the IGBT device and the total heat generated by the IGBT device can be determined by the thermal resistance model, so that the controller can obtain the total heat generated by the IGBT device according to the power consumption of the IGBT device by the thermal resistance model. According to the total heat generated by the IGBT device, the working state of the current IGBT device can be known, and whether the temperature of the water-cooled radiator substrate is within the proper temperature range can be judged. If the temperature of the water-cooling radiator substrate exceeds the maximum value of the proper temperature range, cooling measures are taken in time to increase the rotating speed of a cooling fan so as to reduce the temperature of the IGBT device; and if the temperature of the water-cooling radiator substrate is lower than the minimum value of the proper temperature range, the rotating speed of the cooling fan is timely reduced to maintain the proper working temperature of the IGBT device. Therefore, the controller can accurately control the rotating speed of the cooling fan so that the IGBT device can work in a proper temperature range as far as possible, and the working reliability of the vehicle-mounted converter is guaranteed.
Fig. 3 is a flowchart of a second method for thermal management of a vehicle-mounted converter according to an embodiment of the present invention. In addition to the embodiment of fig. 2, as shown in fig. 3, the controller determines the power control signal according to the total heat generated by the IGBT device, the circulating heat dissipation amount of the cooling liquid, and the ambient temperature detected by the ambient temperature sensor in step S23, and includes:
s31: the controller determines the junction temperature of the IGBT device according to the total heat generated by the IGBT device, the circulating heat dissipation capacity of the cooling liquid and the ambient temperature detected by the ambient temperature sensor;
knowing the total heat generated by the current IGBT device and the circulating heat dissipation capacity of the cooling liquid, the residual heat dissipation capacity of the current IGBT device can be determined; and predicting the junction temperature inside the current IGBT device according to the residual heat dissipation capacity of the current IGBT device and the ambient temperature around the IGBT device. If the predicted junction temperature inside the IGBT device is higher than the maximum value of the suitable temperature interval of the IGBT device, the temperature inside the IGBT device is over high, if the temperature of the IGBT device is reduced by taking cooling measures in time, the temperature of the IGBT device can be continuously increased, the IGBT device is enabled to fail due to overheating, and the working reliability of the vehicle-mounted converter is affected.
S32: and the controller determines a power supply control signal according to the junction temperature of the IGBT device.
If the current junction temperature of the IGBT device is higher than the maximum value of the suitable temperature range of the IGBT device, the controller determines the heat dissipation amount required when the IGBT device is lowered to the suitable temperature range according to the current actual junction temperature of the IGBT device and the ambient temperature, and determines the size of the power supply control signal output by the controller according to the heat dissipation amount required when the IGBT device is lowered to the suitable temperature range.
As can be seen from the above embodiments, the controller may determine the junction temperature of the IGBT device based on the total heat generated by the IGBT device, the heat dissipated by the coolant circulating, and the ambient temperature detected by the ambient temperature sensor. If the current junction temperature of the IGBT device is higher than the maximum value of the suitable temperature range of the IGBT device, the controller determines the heat dissipation amount required when the IGBT device is lowered to the suitable temperature range according to the current actual junction temperature of the IGBT device and the ambient temperature, and then determines the size of the power supply control signal output by the controller according to the heat dissipation amount of the IGBT device. The controller determines the magnitude of the power supply control signal through the junction temperature of the IGBT device, and can take cooling measures in time according to the actual working state of the IGBT device.
In one embodiment of the invention, a power supply control signal is output by judging whether the working temperature of the IGBT device is within the range of an appropriate temperature range, wherein the power supply control signal is power supply frequency;
if the working temperature of the IGBT device is higher than the maximum value of the proper temperature interval, the controller controls the power supply frequency to increase, when the power supply frequency is increased, the controller controls the rotating speed of the heat dissipation fan to increase through the variable frequency power supply, the cooling effect of the heat dissipation fan is improved by accelerating the rotating speed of the heat dissipation fan, the temperature of the water-cooling radiator substrate is quickly and effectively reduced, and the working temperature of the IGBT device is ensured to be within the proper temperature interval range;
if the working temperature of the IGBT device is lower than the minimum value of the proper temperature interval of the IGBT device, the controller controls the power supply frequency to be reduced, when the power supply frequency is reduced, the controller controls the rotating speed of the heat dissipation fan to be reduced through the variable frequency power supply, the cooling effect of the heat dissipation fan is reduced by reducing the rotating speed of the heat dissipation fan, the working characteristic of the IGBT device is prevented from being influenced by the excessive cooling of the heat dissipation fan, and the working temperature of the IGBT device is ensured to be within the proper temperature interval range;
according to the embodiment, the rotating speed and the actual cooling effect of the cooling fan are actively adjusted according to the actual condition of the working temperature of the IGBT device, the condition that cooling is not timely or excessive is avoided, the IGBT device works in the range of the suitable temperature range, and the working characteristics of the IGBT device and the working reliability of the vehicle-mounted converter are guaranteed.
In one embodiment of the invention, the controller includes an embedded system and hardware circuitry. The controller in the embodiment of the invention realizes the heat management method of the vehicle-mounted converter through an embedded system program, and realizes data communication with all temperature sensors in the embodiment of the invention through a hardware circuit.
Further, the embodiment of the invention provides a vehicle-mounted converter, which comprises the vehicle-mounted converter thermal management system of the embodiment.
Further, the embodiment of the invention provides a railway locomotive and a motor train unit, which comprise the vehicle-mounted converter.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An on-board converter thermal management system, comprising:
the device comprises a water tank, a water-cooled radiator substrate for cooling the IGBT device of the converter, a cooling tower, a variable frequency power supply, a radiating fan for cooling the IGBT device of the converter, a water inlet temperature sensor, a water outlet temperature sensor, an environment temperature sensor and a controller;
the water tank is connected to the water inlet of the water-cooling radiator base plate through a water pump, the water outlet of the water-cooling radiator base plate is connected with the water inlet of the cooling tower through a pipeline, and the water outlet of the cooling tower is connected with the water tank through a pipeline; the water tank is filled with cooling liquid, the cooling liquid flows into the water-cooled radiator substrate through the water pump to be subjected to liquid cooling, the heated cooling liquid flows into the cooling tower to be cooled, and the cooled cooling liquid flows back into the water tank;
the water inlet temperature sensor and the water outlet temperature sensor are respectively arranged at the water inlet and the water outlet of the water-cooling radiator substrate; the environment temperature sensor is arranged on the water-cooling radiator substrate and used for measuring the internal environment temperature of the vehicle-mounted converter;
the water inlet temperature sensor, the water outlet temperature sensor and the environment temperature sensor are all connected with the controller, the controller is also connected with the variable frequency power supply, and the variable frequency power supply is used for supplying power to the cooling fan;
the controller obtains the working current and the working voltage of the IGBT device to obtain the total heat generated by the IGBT device; the controller calculates the circulating heat dissipation capacity of the cooling liquid according to the water inlet temperature and the water outlet temperature of the water-cooled radiator substrate detected by the water inlet temperature sensor and the water outlet temperature sensor;
the controller determines a power supply control signal according to the total heat generated by the IGBT device, the circulating heat dissipation capacity of the cooling liquid and the environment temperature detected by the environment temperature sensor;
the controller controls the variable frequency power supply according to the power supply control signal so as to control the rotating speed of the cooling fan through the variable frequency power supply.
2. The vehicle-mounted converter thermal management system according to claim 1, wherein the controller obtains the operating current and the operating voltage of the IGBT device to obtain the total heat generated by the IGBT device, and the method comprises the following steps:
the controller determines the power consumption of the IGBT device according to the working current and the working voltage of the IGBT device;
the controller determines the total heat generated by the IGBT device according to the power consumption of the IGBT device.
3. The vehicle converter thermal management system of claim 2, wherein the controller determines the power consumption of the IGBT device based on the operating current and the operating voltage of the IGBT device, comprising:
and the controller determines the power consumption of the IGBT device through an integration algorithm according to the working current and the working voltage of the IGBT device.
4. The on-board converter thermal management system of claim 2, wherein said controller determines a total amount of heat generated by said IGBT devices based on power consumption of said IGBT devices, comprising:
the controller establishes a thermal resistance model of the water-cooling radiator through simulation software;
and the controller calculates the total heat generated by the IGBT device through the thermal resistance model according to the power consumption of the IGBT device.
5. The vehicle converter thermal management system of claim 1, wherein the controller determines the power control signal based on the total heat generated by the IGBT devices, the heat dissipated by the coolant circulating, and the ambient temperature sensed by the ambient temperature sensor, comprising:
the controller determines the junction temperature of the IGBT device according to the total heat generated by the IGBT device, the circulating heat dissipation capacity of cooling liquid and the ambient temperature detected by the ambient temperature sensor;
and the controller determines a power supply control signal according to the junction temperature of the IGBT device.
6. The vehicle converter thermal management system of claim 5, wherein the power control signal is a power frequency;
the controller determines a power supply control signal according to the junction temperature of the IGBT device, and the method comprises the following steps:
when the junction temperature of the IGBT device exceeds the maximum value of the suitable temperature interval of the IGBT device, the controller controls the power supply frequency to increase;
the controller is according to power control signal control variable frequency power supply to through variable frequency power supply the control cooling blower's rotational speed, include:
when the power supply frequency is increased, the controller controls the rotating speed of the cooling fan to increase through the variable frequency power supply.
7. The vehicle converter thermal management system of claim 6, wherein the controller determines a power supply control signal based on a junction temperature of the IGBT device, further comprising:
when the junction temperature of the IGBT device is lower than the minimum value of the suitable temperature interval of the IGBT device, the controller controls the power supply frequency to be reduced;
the controller is according to power control signal control variable frequency power supply to through variable frequency power supply the control cooling blower's rotational speed, include:
when the power supply frequency is reduced, the controller controls the rotating speed of the cooling fan to be reduced through the variable frequency power supply.
8. The on-board converter thermal management system of claim 1, wherein the controller comprises an embedded system and a hardware circuit.
9. An on-board converter thermal management method applied to the on-board converter thermal management system of any one of claims 1 to 8, comprising:
the controller obtains the working current and the working voltage of the IGBT device to obtain the total heat generated by the IGBT device; the controller calculates the circulating heat dissipation capacity of the cooling liquid according to the water inlet temperature and the water outlet temperature of the water-cooled radiator substrate detected by the water inlet temperature sensor and the water outlet temperature sensor;
the controller determines a power supply control signal according to the total heat generated by the IGBT device, the circulating heat dissipation capacity of the cooling liquid and the environment temperature detected by the environment temperature sensor;
the controller controls the variable frequency power supply according to the power supply control signal so as to control the rotating speed of the cooling fan through the variable frequency power supply.
10. An onboard converter, comprising an onboard converter thermal management system as claimed in any one of claims 1 to 8.
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