CN107340076B - Temperature detection method and temperature detection system of brake resistor - Google Patents
Temperature detection method and temperature detection system of brake resistor Download PDFInfo
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- CN107340076B CN107340076B CN201610279486.6A CN201610279486A CN107340076B CN 107340076 B CN107340076 B CN 107340076B CN 201610279486 A CN201610279486 A CN 201610279486A CN 107340076 B CN107340076 B CN 107340076B
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- 238000001514 detection method Methods 0.000 title claims abstract description 11
- 238000005070 sampling Methods 0.000 claims abstract description 112
- 238000010521 absorption reaction Methods 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000012546 transfer Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 description 8
- 238000012545 processing Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
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Abstract
The embodiment of the invention provides a temperature detection method and a temperature detection system of a brake resistor, wherein the method comprises the following steps: acquiring the absorption energy of the brake resistor within a sampling time interval; determining a temperature rise value of the brake resistor in the sampling time interval according to the absorbed energy; determining a temperature reduction value of the brake resistor in the sampling time interval according to the temperature of the brake resistor at the last sampling time, the temperature increase value, the environment temperature at the current sampling time and the sampling time interval; and determining the temperature of the brake resistor at the current sampling moment according to the temperature of the brake resistor at the last sampling moment, the temperature increase value and the temperature decrease value. The temperature of the brake resistor is measured in a non-contact mode, and safety and reliability are high.
Description
Technical field
The present invention relates to the temperature checking methods and temperature detection system of detection technique field more particularly to a kind of braking resistor
System.
Background technique
Wind power generating set includes generator-side converter wear and grid-side converter, and DC bus is connected to generator-side converter wear and net side
Between current transformer, the busbar voltage in order to guarantee DC bus needs the DC bus in current transformer within the scope of safe voltage
Upper connection brake circuit.Brake circuit includes braking resistor and electronic power switch etc., detects that busbar voltage is more than braking electricity
When pressing threshold value, electronic power switch closure, braking resistor work guarantees bus electricity to fall the energy consumption on DC bus
It is pressed within the scope of safe voltage；Safe voltage thresholds are dropped to busbar voltage, electronic power switch is opened, and braking resistor stops work
Make.When due to braking resistor work, the temperature of braking resistor is very high, often reaches several hundred degrees Celsius, if using temperature sensor
Temperature detection is carried out to braking resistor, then needs the temperature sensor using heat-resisting material, cost is relatively high；Meanwhile it braking
When resistance performance, the voltage of braking resistor is very high, can achieve 700V or more, if using temperature sensor to braking resistor into
Trip temperature detection, then need the temperature sensor using high insulating materials, further, if the insulation of temperature sensor is broken
The bad then high voltage of braking resistor may puncture temperature sensor, therefore temperature sensor needs isolation pressure resistance with higher
Ability.
Braking resistor absorbs big energy when working in a short time, so that the temperature of braking resistor sharply increases, normally
In the case of, braking resistor has the sufficient time to be slowly restored to by way of natural cooling close to environment temperature.But if
Braking resistor frequent starting, then braking resistor does not have enough time cooling, so that the temperature of braking resistor constantly rises, finally leads
The insulating part overheat near braking resistor or braking resistor is caused to burn, the implements that seriously will cause near braking resistor are on fire
Etc. consequences.
Summary of the invention
The purpose of the present invention is to provide a kind of temperature checking method of braking resistor and system for detecting temperature, to braking electricity
Resistance carries out monitoring temperature.
According to an aspect of the present invention, the present invention provides a kind of temperature checking method of braking resistor, which comprises
Obtain the absorption energy of the braking resistor in sampling time interval；Determine the braking resistor in institute according to the absorption energy
State the temperature increase in sampling time interval；Temperature, the temperature liter according to the braking resistor in a upper sampling instant
High level, the environment temperature of current sample time and the sampling time interval determine the braking resistor between the sampling time
Every interior temperature reduction；According to the braking resistor the temperature of a upper sampling instant, the temperature increase and
The temperature reduction determines the braking resistor in the temperature of current sample time.
Further, the temperature checking method is applied in wind power generating set, and the wind power generating set includes machine
Side current transformer, grid-side converter, DC bus and brake circuit, the DC bus are connected to the generator-side converter wear and described
Between grid-side converter, the brake circuit is connected on the DC bus, the braking resistor is mounted on the brake circuit
In.
Further, the processing for obtaining the absorption energy of the braking resistor in sampling time interval includes: to obtain
The generator-side converter wear is in the pusher side power of the current sample time and the grid-side converter in the present sample
Difference between the pusher side power and the net side power is obtained institute multiplied by the sampling time interval by the net side power at quarter
State the absorption energy of the braking resistor in sampling time interval.
Further, the processing for obtaining the absorption energy of the braking resistor in sampling time interval includes: basis
The braking resistor is in the temperature of a upper sampling instant, the temperature drift coefficient of the braking resistor and the braking resistor
Resistance value a reference value determine the braking resistor in the resistance value of the current sample time；According to the DC bus described
The busbar voltage of current sample time, the braking resistor are in the resistance value of the current sample time and between the sampling time
Every the absorption energy for determining the braking resistor in the sampling time interval.
Further, the busbar voltage according to the DC bus in the current sample time, braking electricity
Resistance determines the braking in the sampling time interval in the resistance value of the current sample time and the sampling time interval
If the processing of the absorption energy of resistance includes: that the brake circuit by pulse width modulation mode controls the braking resistor,
According toDetermine the absorption energy of the braking resistor in the sampling time interval, wherein QIt inhalesFor
The absorption energy of the braking resistor, u in the sampling time intervalBusFor the busbar voltage of the current sample time, t is
The sampling time interval, R are resistance value of the braking resistor in the current sample time, u0For the brake circuit
Brake actuating voltage threshold, Δ u are preset voltage constant.
Further, the busbar voltage according to the DC bus in the current sample time, braking electricity
Resistance determines the braking in the sampling time interval in the resistance value of the current sample time and the sampling time interval
If the processing of the absorption energy of resistance includes: that the brake circuit by Hysteresis control mode controls the braking resistor,
According toDetermine the absorption energy of the braking resistor in the sampling time interval, wherein QIt inhalesIt is adopted to be described
The absorption energy of the braking resistor, u in sample time intervalBusFor the busbar voltage of the current sample time, t is described adopts
Sample time interval, R are resistance value of the braking resistor in the current sample time.
Further, the method also includes: when the braking resistor is greater than or equal in the temperature of current sample time
When the temperature pre-warning threshold value of the braking resistor, braking resistor pre-warning signal is generated.
According to another aspect of the present invention, a kind of temperature detection system of braking resistor for wind power generating set is also provided
System, the system for detecting temperature include temperature-detecting device, generator-side converter wear, grid-side converter, DC bus and brake circuit,
The DC bus is connected between the generator-side converter wear and the grid-side converter, and the system is connected on the DC bus
Dynamic circuit, the braking resistor are mounted in the brake circuit, and the temperature-detecting device is connected with the brake circuit, institute
State temperature-detecting device for execute it is preceding it is any as described in braking resistor temperature checking method.
Further, the temperature-detecting device is integrated in the inverter controller of the wind power generating set.
Further, the system for detecting temperature is mounted in the converter cabinet of the wind power generating set.Further, institute
System for detecting temperature is stated to be mounted in the converter cabinet of the wind power generating set.
Using the temperature checking method and system for detecting temperature of braking resistor provided in an embodiment of the present invention, by counting first
The heat that brake temperature absorbs is calculated, further according to the Current Temperatures of the heat Calculation braking resistor, realizes the temperature to braking resistor
Noncontacting measurement, no setting is required for measuring the temperature sensor of braking resistor temperature, high safety and reliability.
Detailed description of the invention
Fig. 1 shows the flow diagram of the temperature checking method of the braking resistor in the embodiment of the present invention one；
Fig. 2 shows the system for detecting temperature of the braking resistor for wind power generating set a kind of in the embodiment of the present invention two
Structural schematic diagram.
Description of symbols:
210- temperature-detecting device, 220- generator-side converter wear, 230- grid-side converter, 240- DC bus, 250- braking
Circuit, 260- braking resistor, 270- generator, the grid-connected transformer of 280-, 290- power grid.
Specific embodiment
Detailed description of the present invention exemplary embodiment with reference to the accompanying drawing.
Embodiment one
Fig. 1 shows the flow diagram of the temperature checking method of the braking resistor in the embodiment of the present invention one.Referring to Fig. 1,
A kind of temperature checking method of braking resistor includes S110, S120, S130 and S140.
In S110, the absorption energy of the braking resistor in sampling time interval is obtained, the sampling time interval refers to
From a upper sampling instant to the time interval of current sample time.
In frequency converter or unsteady flow for using AC-DC-exchange topological structure frequency converter perhaps current transformer
Brake circuit is connected on the DC bus of device, brake circuit includes electronic power switch and braking resistor.When presetting sampling
Between between be divided into t, current sample time ti, a upper sampling instant is ti-1, i.e. ti-ti-1=t；Such as sampling time interval t can be with
It is 1 second or 0.5 second etc..
In the present embodiment, the braking resistor in sampling time interval can be obtained according to the busbar voltage of DC bus
Absorption energy, i.e., using the braking resistor a upper sampling instant temperature as the braking resistor in present sample
Second assumed value of moment temperature determines the braking resistor in institute according to the second assumed value of the current sample time temperature
State the resistance value of current sample time；Busbar voltage, the braking according to the DC bus in the current sample time
Resistance determines the system in the sampling time interval in the resistance value of the current sample time and the sampling time interval
The absorption energy of dynamic resistance.
Specifically, the mode of brake circuit control braking resistor includes the mode of pulsewidth modulation or Hysteresis control, if
The brake circuit controls the braking resistor by pulse width modulation mode, then basis
Determine the absorption energy of the braking resistor in the sampling time interval, wherein QIt inhalesFor the sampling time interval
The absorption energy of the interior braking resistor, uBusFor the busbar voltage of the current sample time, t is the sampling time interval,
R is resistance value of the braking resistor in the current sample time, and duty is the output duty cycle of braking resistor.
In brake circuit is in such a way that pulse width modulation mode controls braking resistor:
Wherein, u0For the brake actuating voltage threshold of the brake circuit, Δ u is preset voltage constant.
If the brake circuit controls the braking resistor, basis by Hysteresis control mode
Determine the absorption energy of the braking resistor in the sampling time interval, wherein QIt inhalesFor the sampling time interval
The absorption energy of the interior braking resistor, uBusFor the busbar voltage of the current sample time, t is the sampling time interval,
R is resistance value of the braking resistor in the current sample time.
Braking resistor described in above-mentioned formula (1) and formula (3) the current sample time resistance value R according to formula
(4) it determines.
R=K × T+R0 (4)
Wherein, R is resistance value of the braking resistor in the current sample time, and K is the temperature drift coefficient of braking resistor
(for constant), R0For the resistance value a reference value (for constant) of braking resistor, T is temperature of the braking resistor in a upper sampling instant,
In the present embodiment, using braking resistor a upper sampling instant temperature T as the braking resistor in current sample time
Second assumed value of temperature is to calculate braking resistor in the resistance value of the current sample time by formula (4).
Optionally, described in the case where for the temperature checking method of the present embodiment to be applied in wind power generating set
Wind power generating set includes generator-side converter wear, grid-side converter, DC bus and brake circuit, and the DC bus is connected to institute
It states between generator-side converter wear and grid-side converter, brake circuit is connected on the DC bus, the braking resistor is mounted on institute
It states in brake circuit.Pusher side power and the net side of the generator-side converter wear in the current sample time can also be obtained
Current transformer the current sample time net side power, according to the pusher side power, net side power and between the sampling time
Every the absorption energy for determining the braking resistor in the sampling time interval.
It specifically, can basis
Q inhales=(P machine-PNet)·t (5)
Determine the absorption energy of braking resistor described in the current sample time, wherein QIt inhalesFor in the sampling time interval
The absorption energy of the braking resistor, PMachineFor the pusher side power, PNetFor the net side power, t is the sampling time interval.
In S120, determine that temperature of the braking resistor in the sampling time interval increases according to the absorption energy
Value.
It specifically, can basis
Determine temperature increase of the braking resistor in the sampling time interval, wherein △ TIt risesFor the braking electricity
Hinder the temperature increase in the sampling time interval, QIt inhalesFor the absorption energy of the braking resistor in the sampling time interval
Amount, C are the specific heat capacity (for constant) of the braking resistor, and M is the quality of the braking resistor (for constant).
In S130, according to the braking resistor in temperature, the temperature increase, present sample of a upper sampling instant
The environment temperature at quarter and the sampling time interval determine that temperature of the braking resistor in the sampling time interval reduces
Value.
Specifically, by the braking resistor after the temperature of a upper sampling instant changes according to the temperature increase
Temperature value as the braking resistor current sample time temperature the first assumed value, according to the current sample time temperature
First assumed value of degree determines temperature reduction of the braking resistor in the sampling time interval.
It is possible to further basis
△TDrop=-τ (T+ △ TIt rises-T0)·t (7)
Determine temperature reduction of the braking resistor in the sampling time interval, wherein △ TDropFor described in determination
Temperature reduction of the braking resistor in the sampling time interval, τ are the coefficient of heat transfer (for constant) of the braking resistor, T0
For environment temperature, t is the sampling time interval, T+ △ TIt risesFor braking resistor a upper sampling instant temperature according to temperature liter
Temperature value after high level variation, the temperature by braking resistor in a upper sampling instant becomes according to temperature increase in the present embodiment
First assumed value of the temperature value as the braking resistor in current sample time temperature after change calculates to pass through formula (7)
Temperature reduction of the braking resistor in the sampling time interval.
In S140, by the braking resistor in the temperature of a upper sampling instant, the temperature increase and described
Temperature reduction determines the braking resistor in the temperature of current sample time.
Optionally, the temperature checking method of the present embodiment can also include: when the braking resistor is in current sample time
Temperature be greater than or equal to the braking resistor temperature pre-warning threshold value when, generate braking resistor pre-warning signal.
Using the technical solution of the present embodiment, braking electricity is determined according to the absorption energy of braking resistor in sampling time interval
Hinder the temperature increase in sampling time interval；Temperature by the braking resistor in a upper sampling instant is increased according to temperature
Temperature value after value variation, in the first assumed value of current sample time temperature, is currently adopted as the braking resistor according to described
First assumed value of sample moment temperature determines temperature reduction of the braking resistor in the sampling time interval；It will be described
Braking resistor is after the temperature of a upper sampling instant changes according to the temperature increase and the temperature reduction
Temperature value as the braking resistor current sample time temperature.By braking resistor a upper sampling instant temperature and
The operating parameter (including but not limited to absorption energy etc.) for the braking resistor that current sample time obtains determines that braking resistor is current
The temperature of sampling instant realizes the temperature noncontacting measurement to braking resistor, high safety and reliability.
Embodiment two
Fig. 2 shows the system for detecting temperature of the braking resistor for wind power generating set a kind of in the embodiment of the present invention two
Structural schematic diagram.The system for detecting temperature of braking resistor provided in this embodiment for wind power generating set is in wind-driven generator
The temperature checking method of the braking resistor in embodiment one is executed in group.Referring to fig. 2, system for detecting temperature includes temperature detection dress
210, generator-side converter wear 220, grid-side converter 230, DC bus 240 and brake circuit 250 are set, the DC bus 240 connects
It connects between the generator-side converter wear 220 and grid-side converter 230, brake circuit 250, institute is connected on the DC bus 240
It states braking resistor 260 to be mounted in the brake circuit 250, the temperature-detecting device 210 and 250 phase of brake circuit
Even, the temperature-detecting device 210 is used to execute the temperature checking method of braking resistor described in embodiment one.For example
Property illustrate application environment of the present embodiment for the system for detecting temperature of the braking resistor of wind power generating set, be also shown in Fig. 2
Generator 270, grid-connected transformer 280 and power grid 290, wherein generator-side converter wear 220 is connect with generator 270, net side unsteady flow
Device 230 connects power grid 290 by grid-connected transformer 280.
Further, the temperature-detecting device is integrated in the inverter controller of the wind power generating set.
Further, the system for detecting temperature is mounted in the converter cabinet of the wind power generating set.
Using the technical solution of the present embodiment, braking electricity is determined according to the absorption energy of braking resistor in sampling time interval
Hinder the temperature increase in sampling time interval；Temperature by the braking resistor in a upper sampling instant is increased according to temperature
Temperature value after value variation, in the first assumed value of current sample time temperature, is currently adopted as the braking resistor according to described
First assumed value of sample moment temperature determines temperature reduction of the braking resistor in the sampling time interval；It will be described
Braking resistor is after the temperature of a upper sampling instant changes according to the temperature increase and the temperature reduction
Temperature value as the braking resistor current sample time temperature.By braking resistor a upper sampling instant temperature and
The operating parameter (including but not limited to absorption energy etc.) for the braking resistor that current sample time obtains determines that braking resistor is current
The temperature of sampling instant realizes the temperature noncontacting measurement to braking resistor, high safety and reliability.
It is above-mentioned to be realized in hardware, firmware according to the method for the present invention, or be implemented as being storable in recording medium
Software or computer code in (such as CD ROM, RAM, floppy disk, hard disk or magneto-optic disk), or it is implemented through network downloading
Original storage in long-range recording medium or nonvolatile machine readable media and the meter that will be stored in local recording medium
Calculation machine code, so that method described herein can be stored in using general purpose computer, application specific processor or programmable or specially
It is handled with such software in the recording medium of hardware (such as ASIC or FPGA).It is appreciated that computer, processor, micro-
Processor controller or programmable hardware include can store or receive software or computer code storage assembly (for example, RAM,
ROM, flash memory etc.), when the software or computer code are by computer, processor or hardware access and execute, realize herein
The processing method of description.In addition, when general purpose computer accesses the code for realizing the processing being shown here, the execution of code
General purpose computer is converted to the special purpose computer for being used for executing the processing being shown here.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (9)
1. a kind of temperature checking method of braking resistor, which is characterized in that the described method includes:
Obtain the absorption energy of the braking resistor in sampling time interval；
Temperature increase of the braking resistor in the sampling time interval is determined according to the absorption energy；
According to the braking resistor in the temperature of a upper sampling instant, the environment temperature of the temperature increase, current sample time
Degree and the sampling time interval determine temperature reduction of the braking resistor in the sampling time interval；
According to the braking resistor a upper sampling instant temperature, the temperature increase and the temperature reduction
Determine the braking resistor in the temperature of current sample time；
The temperature checking method is applied in wind power generating set, and the wind power generating set includes generator-side converter wear, net side
Current transformer, DC bus and brake circuit, the DC bus be connected to the generator-side converter wear and the grid-side converter it
Between, the brake circuit is connected on the DC bus, the braking resistor is mounted in the brake circuit,
Wherein, temperature reduction of the braking resistor in the sampling time interval is determined in the following manner:
ΔTDrop=-τ × (T+ Δ TIt rises-T0) × t,
Wherein, Δ TDropFor temperature reduction of the braking resistor in the sampling time interval, τ is the braking resistor
Coefficient of heat transfer, T0For the environment temperature of current sample time, t is the sampling time interval, and T is the braking resistor upper one
The temperature of sampling instant, Δ TIt risesFor temperature increase of the braking resistor in the sampling time interval.
2. temperature checking method according to claim 1, which is characterized in that the system in the acquisition sampling time interval
The step of absorption energy of dynamic resistance includes:
The generator-side converter wear is obtained to work as in the pusher side power of the current sample time and the grid-side converter described
The net side power of preceding sampling instant, by the difference between the pusher side power and the net side power multiplied by between the sampling time
Every obtaining the absorption energy of the braking resistor in the sampling time interval.
3. temperature checking method according to claim 1, which is characterized in that the system in the acquisition sampling time interval
The step of absorption energy of dynamic resistance includes:
According to the braking resistor in the temperature of a upper sampling instant, the temperature drift coefficient of the braking resistor and described
The resistance value a reference value of braking resistor determines the braking resistor in the resistance value of the current sample time；
According to the DC bus in the busbar voltage of the current sample time, the braking resistor in the present sample
The resistance value at quarter and the sampling time interval determine the absorption energy of the braking resistor in the sampling time interval.
4. temperature checking method according to claim 3, which is characterized in that described to be worked as according to the DC bus described
The resistance value and the sampling time interval of the busbar voltage of preceding sampling instant, the braking resistor in the current sample time
The step of determining the absorption energy of the braking resistor in the sampling time interval include:
If the brake circuit controls the braking resistor, basis by pulse width modulation mode
Determine the absorption energy of the braking resistor in the sampling time interval, wherein QIt inhalesFor institute in the sampling time interval
State the absorption energy of braking resistor, uBusFor the busbar voltage of the current sample time, t is the sampling time interval, and R is
Resistance value of the braking resistor in the current sample time, u0For the brake actuating voltage threshold of the brake circuit, Δ u
For preset voltage constant.
5. temperature checking method according to claim 3, which is characterized in that described to be worked as according to the DC bus described
The resistance value and the sampling time interval of the busbar voltage of preceding sampling instant, the braking resistor in the current sample time
The step of determining the absorption energy of the braking resistor in the sampling time interval include:
If the brake circuit controls the braking resistor, basis by Hysteresis control mode
Determine the absorption energy of the braking resistor in the sampling time interval, wherein QIt inhalesFor institute in the sampling time interval
State the absorption energy of braking resistor, uBusFor the busbar voltage of the current sample time, t is the sampling time interval, and R is
Resistance value of the braking resistor in the current sample time.
6. temperature checking method according to claim 1, which is characterized in that the method also includes:
When the braking resistor current sample time temperature be greater than or equal to the braking resistor temperature pre-warning threshold value when,
Generate braking resistor pre-warning signal.
7. a kind of system for detecting temperature of the braking resistor for wind power generating set, which is characterized in that the temperature detection system
System includes temperature-detecting device (210), generator-side converter wear (220), grid-side converter (230), DC bus (240) and brakes back
Road (250), the DC bus (240) are connected between the generator-side converter wear (220) and the grid-side converter (230),
It is connected the brake circuit (250) on the DC bus (240), braking resistor (260) is mounted on the brake circuit (250)
In, the temperature-detecting device (210) is connected with the brake circuit (250), and the temperature-detecting device (210) is for executing
Such as the temperature checking method of braking resistor as claimed in any one of claims 1 to 6.
8. system for detecting temperature according to claim 7, which is characterized in that the temperature-detecting device (210) is integrated in
In the inverter controller of the wind power generating set.
9. system for detecting temperature according to claim 8, which is characterized in that the system for detecting temperature is mounted on the wind
In the converter cabinet of power generator group.
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| CN201610279486.6A CN107340076B (en) | 2016-04-28 | 2016-04-28 | Temperature detection method and temperature detection system of brake resistor |
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| CN110949359B (en) * | 2019-12-23 | 2021-10-26 | 中车株洲电力机车有限公司 | Brake resistor overheating protection method and device, readable storage medium and controller |
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| CN111711402B (en) * | 2020-06-18 | 2021-02-09 | 福州富昌维控电子科技有限公司 | Method for detecting temperature of brake resistor in driver |
| CN112697307B (en) * | 2020-12-10 | 2023-08-29 | 西安中车永电捷通电气有限公司 | Temperature determination method, device, vehicle, storage medium, and program product |
| CN112945415B (en) * | 2021-02-09 | 2023-08-01 | 苏州长光华芯光电技术股份有限公司 | Laser array temperature detection method and device |
| CN114530828B (en) * | 2022-02-23 | 2024-02-06 | 中车青岛四方车辆研究所有限公司 | Temperature estimation protection method and system for brake resistor of railway vehicle |
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| CN105092094A (en) * | 2015-05-21 | 2015-11-25 | 北京经纬恒润科技有限公司 | Method, apparatus and system for acquiring motor winding temperature |
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