CN-121986441-A - Method and controller for controlling a converter device, and conversion system

Abstract

Embodiments of the present disclosure provide a method and controller for controlling a converter device, and a conversion system including the controller. The method includes obtaining a first measurement signal indicative of a first voltage input from a power source to the converter device in a first mode of operation of the converter device, switching at least one power switch of the converter device between an on state and an off state in the first mode of operation, comparing the first voltage with a first threshold, and controlling the converter device to change from the first mode of operation to a second mode of operation of the converter device in response to the first voltage being above the first threshold, the at least one power switch of the converter device being switched to the off state in the second mode of operation. Embodiments of the present disclosure may effectively reduce or eliminate overstress of power switches in a converter without additional costs and losses.

Inventors

• ZHANG XINBO
• JIANG YAJUAN
• XU CHUNLEI
• YU ZHUAN
• WANG MENGJUN

Assignees

• ABB瑞士股份有限公司

Dates

Publication Date

20260505

Application Date

20230818

Claims (11)

1. 1. A method for controlling a converter device, comprising: obtaining a first measurement signal indicative of a first voltage input to the converter device from a power source in a first mode of operation of the converter device, at least one power switch of the converter device switching between an on state and an off state in the first mode of operation; Comparing the first voltage with a first threshold value, and In response to the first voltage being above the first threshold, controlling the converter device to change from the first mode of operation to a second mode of operation of the converter device in which the at least one power switch of the converter device is switched to the off state.
2. 2. The method of claim 1, further comprising: Acquiring a second measurement signal indicative of a second voltage input from the power source to the converter device in the second mode of operation, and Comparing the second voltage with a second threshold value, and The converter device is controlled to change from the second mode of operation back to the first mode of operation in response to the second voltage being below the second threshold.
3. 3. The method of claim 1, further comprising: the converter device is controlled to operate in the first mode of operation in response to the first voltage being below the first threshold.
4. 4. The method of claim 2, further comprising: the converter device is controlled to operate in the second mode of operation in response to the second voltage being above the second threshold.
5. 5. The method of claim 1, wherein in the first mode of operation, the at least one power switch is controlled using a pulse width modulated, PWM, signal.
6. 6. The method of claim 1, wherein in the second mode of operation, all of the power switches in the converter device are turned off and in the off state.
7. 7. The method of claim 1, wherein the converter device comprises at least one of a DC-DC converter, an AC-DC converter, and a DC-AC converter.
8. 8. A controller for controlling a converter device, comprising: At least one processing unit, and At least one memory coupled to the at least one processing unit and storing instructions executable by the at least one processing unit, which when executed by the at least one processing unit, cause the apparatus to perform the method of any one of claims 1 to 7.
9. 9. A computer readable storage medium having stored thereon computer readable program instructions which, when executed by a processing unit, cause the processing unit to perform the method according to any of claims 1 to 7.
10. 10. A controller for controlling a converter device, comprising: an analog signal processing unit configured to perform the method according to any one of claims 1 to 7.
11. 11. A conversion system, comprising: converter device, and A controller according to claim 8 or 10.

Description

Method and controller for controlling a converter device, and conversion system Technical Field Embodiments of the present disclosure relate generally to power electronics, and more particularly, to a method and controller for controlling a converter device, and a conversion system including the controller. Background Power electronic converters are widely used in the power field and other industrial fields. The power electronic converter may perform power conversion as needed to provide AC and/or DC power or suitable voltages and/or currents to various loads. In a power electronic converter, one or more power switching devices or power switching tubes are typically provided, and by controlling the turning on and off of the power switching devices or power switching tubes, a desired power conversion may be achieved. During operation of the converter, overstresses often occur in the power switching devices or power switching tubes. For example, when a power switch tube changes from on to off, the voltage stress across the tube may increase dramatically to unsafe levels, which may cause the power switch tube to crack or fail. In conventional solutions, additional passive or active components are added to the converter to achieve soft switching of the power switching device or power switching tube. However, the introduction of these additional components would increase losses and costs. Furthermore, in some cases, conventional solutions still suffer from overstress problems, which lead to device failure. Disclosure of Invention Embodiments of the present disclosure provide a method and controller for controlling a converter device, and a conversion system including the controller. In a first aspect, a method for controlling a converter device is provided. The method includes obtaining a first measurement signal indicative of a first voltage input from a power source to the converter device in a first mode of operation of the converter device, switching at least one power switch of the converter device between an on state and an off state in the first mode of operation, comparing the first voltage with a first threshold, and controlling the converter device to change from the first mode of operation to a second mode of operation of the converter device in response to the first voltage being above the first threshold, the at least one power switch of the converter device being switched to the off state in the second mode of operation. In some embodiments, the method further includes obtaining a second measurement signal indicative of a second voltage input from the power source to the converter device in a second mode of operation, and comparing the second voltage to a second threshold, and controlling the converter device to change from the second mode of operation back to the first mode of operation in response to the second voltage being below the second threshold. In some embodiments, the method further comprises controlling the converter device to operate in the first mode of operation in response to the first voltage being below a first threshold. In some embodiments, the method further comprises controlling the converter device to operate in a second mode of operation in response to the second voltage being above a second threshold. In some embodiments, in the first mode of operation, the at least one power switch is controlled using a pulse width modulated PWM signal. In some embodiments, in the second mode of operation, all power switches in the converter device are turned off and in an off state. In some embodiments, the converter device comprises at least one of a DC-DC converter, an AC-DC converter, and a DC-AC converter. In a second aspect, a controller for controlling a converter device is provided. The controller comprises at least one processing unit, and at least one memory coupled to the at least one processing unit and storing instructions executable by the at least one processing unit, which when executed by the at least one processing unit, cause the apparatus to perform the method according to the first aspect. In a third aspect, a computer-readable storage medium is provided. The computer readable storage medium has stored thereon computer readable program instructions which, when executed by a processing unit, cause the processing unit to perform the method according to the first aspect. In a fourth aspect, a conversion system is provided. The conversion system comprises a converter device and a controller according to the second aspect. Drawings The accompanying drawings, which are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this disclosure. The example embodiments of the present disclosure and their explanations are for explaining the present disclosure without unduly limiting the present disclosure. Fig. 1 illustrates a schematic diagram of a conversion system, power supply, and load according to an embodiment of the p