CN-122002746-A - Traction converter temperature control method, traction converter temperature control device, electronic equipment, nonvolatile storage medium and computer program product

CN122002746ACN 122002746 ACN122002746 ACN 122002746ACN-122002746-A

Abstract

The application discloses a traction converter temperature control method, a traction converter temperature control device, electronic equipment, a nonvolatile storage medium and a computer program product, which are applied to the technical field of vehicle control. The method comprises the steps of determining cooling demand air quantity based on power loss information of a power semiconductor device at the current moment and a target junction temperature of the power semiconductor device in a target working state, determining minimum air quantity required for cooling a reactor according to the power loss information of the reactor at the current moment and the highest working temperature of the reactor, and adjusting the fan rotating speed of a traction converter according to the cooling demand air quantity and the minimum air quantity so as to simultaneously meet the cooling demands of the power semiconductor device and the reactor. The application can solve the problem that the related technology cannot effectively dissipate heat of the integrated components of the converter, realize accurate control of the temperature of the traction converter and effectively prolong the service life of the integrated components of the traction converter.

Inventors

TANG YONGPU
ZHOU LEI
PENG CHENG
WAN WEIWEI
Ping Jiarui
TANG XIANGJIE
HE TAO
TIAN ZONGHENG
Yin Liangxing

Assignees

中车株洲电力机车研究所有限公司

Dates

Publication Date: 20260508
Application Date: 20241104

Claims (15)

1. A traction converter temperature control method, comprising: determining cooling required air quantity based on power loss information of a power semiconductor device at the current moment and a target junction temperature of the power semiconductor device in a target working state; determining the minimum air quantity required by cooling the reactor according to the power loss information of the reactor at the current moment and the highest working temperature of the reactor; And adjusting the rotating speed of a fan of the traction converter according to the cooling required air quantity and the minimum air quantity so as to simultaneously meet the cooling requirements of the power semiconductor device and the reactor.
2. The method according to claim 1, wherein adjusting the fan speed of the traction converter according to the cooling required air volume and the minimum air volume comprises: When the cooling required air quantity is larger than the minimum air quantity, adjusting the rotating speed of the fan to reach the cooling required air quantity; And when the cooling required air quantity is smaller than or equal to the minimum air quantity, adjusting the rotating speed of the fan to the minimum air quantity.
3. The traction converter temperature control method according to claim 1, wherein the power loss information based on the power semiconductor device at the current time and the target junction temperature of the power semiconductor device in the target operating state include: The switching state of the power semiconductor device is controlled, and the real-time voltage and the phase angle of the alternating current output side are obtained according to the real-time voltage of the direct current input side; acquiring real-time current and phase angle of an alternating current output side; and determining the power loss information of the power semiconductor device according to the real-time voltage and the phase angle of the alternating current output side, the real-time current and the phase angle, the switching frequency and the physical parameters of the power semiconductor device.
4. A traction converter temperature control method according to claim 3, wherein said obtaining a real-time voltage and a phase angle of an ac output side from a real-time voltage of a dc input side by controlling a switching state of the power semiconductor device comprises: and sending an on command and an off command to different power semiconductor devices, and acquiring voltage values at two ends of the capacitor by using a voltage sensor to obtain a real-time U, V, W three-phase voltage waveform so as to obtain real-time voltage and a phase angle of an alternating current output side.
5. The traction converter temperature control method according to claim 4, wherein determining power loss information of the power semiconductor device based on the real-time voltage and phase angle of the ac output side, the real-time current and phase angle, the switching frequency of the power semiconductor device, and physical parameters, comprises: According to the real-time voltage and phase angle of the alternating current output side, the real-time current and phase angle, the switching frequency and physical parameters of the power semiconductor device, respectively calculating the first conduction loss, the first switching loss, the second conduction loss and the second switching loss of a diode connected with the power semiconductor device in parallel; And obtaining power loss information of the power semiconductor device according to the first conduction loss, the first switching loss, the second conduction loss and the second switching loss.
6. The traction converter temperature control method of claim 1, wherein the determining the cooling demand air volume comprises: A first temperature sensor and a second temperature sensor are arranged on an air inlet of the traction converter and a radiator of the power semiconductor device in advance, wherein the first temperature sensor is used for measuring the external environment temperature, and the second temperature sensor is used for measuring the real-time temperature of the radiator; And determining the heat resistance of the radiator of the power semiconductor device at the target junction temperature according to the external environment temperature, the real-time temperature difference value of the radiator, the junction-shell heat resistance and the shell-radiator heat resistance of the power semiconductor device so as to determine the cooling required air quantity.
7. The traction converter temperature control method of claim 6, wherein said determining a cooling demand air volume comprises: calculating a difference value between a target junction temperature of a power semiconductor device chip at the current moment and an external environment temperature, and calculating a ratio of the difference value to power loss information of the power semiconductor device; According to the ratio, the thermal resistance between the chip and the device shell of the power semiconductor device and the thermal resistance between the device shell of the power semiconductor device and the radiator, obtaining the thermal resistance of the radiator corresponding to the power semiconductor device to cooling air at the current moment; and determining the cooling demand air quantity at the current moment based on the corresponding relation between the thermal resistance of the radiator to the cooling air and the cooling air quantity.
8. The traction converter temperature control method according to claim 1, wherein the power loss information of the reactor according to the current time and the maximum operating temperature of the reactor include: According to the cold state resistance value of the reactor and the material temperature coefficient of the reactor, determining the thermal state resistance value of the reactor at the highest temperature; And determining the power loss information of the reactor at the current moment according to the current value passing through the reactor at the current moment and the thermal state resistance value.
9. The traction converter temperature control method of claim 1, wherein the determining a minimum air volume required to cool the reactor comprises: determining the temperature of the current cooling air quantity after flowing through the power semiconductor device according to the power loss information of the power semiconductor device, the current cooling air quantity, the temperature of the cold air, the specific heat capacity and the density of the air, and taking the current cooling air quantity as the temperature of the cooling air flowing into the reactor; Determining the thermal resistance between a radiator corresponding to the reactor and cooling air based on the power loss information of the reactor at the current moment, the highest working temperature of the reactor and the temperature of cooling air flowing into the reactor; And determining the lowest air quantity of the reactor based on the corresponding relation between the thermal resistance of the radiator to cooling air and the cooling air quantity, which is constructed in advance.
10. The method according to claim 1, wherein adjusting the fan speed of the traction converter according to the cooling required air volume and the minimum air volume comprises: Pre-constructing a transfer function of cooling air quantity of a radiator flowing through the power semiconductor device and the temperature of a radiator table top; determining the temperature of the radiator table top based on the cooling air quantity and the transfer function at the current moment, and determining the current junction temperature of the power semiconductor device according to the temperature of the radiator table top and the power loss information of the power semiconductor device; and adjusting the rotating speed of a fan of the traction converter according to the current junction temperature of the power semiconductor device, the target junction temperature, the cooling required air quantity and the minimum air quantity.
11. The traction converter temperature control method according to any one of claims 1 to 10, wherein adjusting the fan speed of the traction converter according to the cooling required air volume and the minimum air volume includes: a third temperature sensor is deployed on a coil of the reactor in advance and is used for measuring the temperature of the reactor; in a preset time period, controlling the rotating speed of a fan of the traction converter to enable the current air quantity to be lower than the minimum air quantity so as to enable the actual junction temperature of the power semiconductor device to be continuously close to the target junction temperature; when the current temperature of the reactor is detected to reach the highest working temperature, the rotating speed of the fan of the traction converter is adjusted so that the current cooling air quantity reaches the lowest air quantity.
12. A traction converter temperature control device, comprising: the cooling demand air quantity determining module is used for determining cooling demand air quantity based on power loss information of the power semiconductor device at the current moment and a target junction temperature of the power semiconductor device in a target working state; the minimum air quantity determining module is used for determining the minimum air quantity required by cooling the reactor according to the power loss information of the reactor at the current moment and the maximum working temperature of the reactor; and the heat dissipation adjusting module is used for adjusting the rotating speed of a fan of the traction converter according to the cooling required air quantity and the minimum air quantity so as to simultaneously meet the cooling requirements of the power semiconductor device and the reactor.
13. An electronic device comprising a processor and a memory, the processor being adapted to implement the steps of the traction converter temperature control method according to any one of claims 1 to 11 when executing a computer program stored in the memory.
14. A non-volatile storage medium, characterized in that it has stored thereon a computer program which, when executed by a processor, implements the steps of the traction converter temperature control method according to any one of claims 1 to 11.
15. A computer program product comprising computer programs/instructions which, when executed by a processor, implement the steps of the traction converter temperature control method according to any one of claims 1 to 11.

Description

Traction converter temperature control method, traction converter temperature control device, electronic equipment, nonvolatile storage medium and computer program product Technical Field The present application relates to the field of vehicle control technology, and in particular, to a traction converter temperature control method, apparatus, electronic device, nonvolatile storage medium, and computer program product. Background The traction converter is arranged at the bottom of the train motor train and used for converting electric energy between a direct current system and an alternating current system, converting 1500V direct current from a contact network into 0-1150V three-phase alternating current, and realizing the control of starting, braking and speed regulation of an alternating current traction motor through voltage and frequency regulation control. In the working process of the traction converter, due to the change of output power, the internal integrated devices of the traction converter can change along with the change of output power, such as a power semiconductor device and a reactor, in order to ensure the service life of the internal components, a fan with constant rotating speed is adopted in the related art to dissipate heat of the internal components of the traction converter, but the method cannot realize accurate control of the temperature of the traction converter. In view of this, realizing accurate control of traction converter temperature is a technical problem that the skilled person needs to solve. It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the application and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art. Disclosure of Invention The application provides a traction converter temperature control method, a traction converter temperature control device, electronic equipment, a nonvolatile storage medium and a computer program product, which can accurately control the temperature of a traction converter and effectively prolong the service life of integrated components of the traction converter. In order to solve the technical problems, the application provides the following technical scheme: in one aspect, the application provides a traction converter temperature control method, comprising: determining cooling required air quantity based on power loss information of a power semiconductor device at the current moment and a target junction temperature of the power semiconductor device in a target working state; determining the minimum air quantity required by cooling the reactor according to the power loss information of the reactor at the current moment and the highest working temperature of the reactor; And adjusting the rotating speed of a fan of the traction converter according to the cooling required air quantity and the minimum air quantity so as to simultaneously meet the cooling requirements of the power semiconductor device and the reactor. Exemplary, the adjusting the fan rotation speed of the traction converter according to the cooling required air volume and the minimum air volume includes: When the cooling required air quantity is larger than the minimum air quantity, adjusting the rotating speed of the fan to reach the cooling required air quantity; And when the cooling required air quantity is smaller than or equal to the minimum air quantity, adjusting the rotating speed of the fan to the minimum air quantity. The power loss information of the power semiconductor device based on the current moment and the target junction temperature of the power semiconductor device in the target working state, which are illustrated, include: The switching state of the power semiconductor device is controlled, and the real-time voltage and the phase angle of the alternating current output side are obtained according to the real-time voltage of the direct current input side; acquiring real-time current and phase angle of an alternating current output side; and determining the power loss information of the power semiconductor device according to the real-time voltage and the phase angle of the alternating current output side, the real-time current and the phase angle, the switching frequency and the physical parameters of the power semiconductor device. Illustratively, the method for obtaining the real-time voltage and the phase angle of the ac output side according to the real-time voltage of the dc input side by controlling the switching state of the power semiconductor device includes: and sending an on command and an off command to different power semiconductor devices, and acquiring voltage values at two ends of the capacitor by using a voltage sensor to obtain a real-time U, V, W three-phase voltage waveform so as to obtain real-time voltage and a phase angle of an alternating current output side. Illustrativel