Method for processing power module fault of high voltage and high power frequency converter

A power module and high-power technology, which is applied in the field of high-voltage and high-power inverters, can solve problems such as reducing the output voltage rating of the inverter, and achieve the effects of increasing voltage utilization, simple control methods, and improving output voltage capabilities

Inactive Publication Date: 2004-11-10
BEIJING LEADER & HARVEST ELECTRIC TECH
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  • Abstract
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Problems solved by technology

Although this method achieves the purpose of balancing the three-phase output voltage of the inverter, it ...

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  • Method for processing power module fault of high voltage and high power frequency converter
  • Method for processing power module fault of high voltage and high power frequency converter
  • Method for processing power module fault of high voltage and high power frequency converter

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Embodiment Construction

[0020] In order to facilitate maintenance and meet the needs of different voltage levels, the current high-voltage and high-power inverters mostly adopt modular design, that is, each phase of the inverter is composed of several power module units connected in series. By changing the voltage command of the power module, the voltage output of the power module unit can be changed, thereby changing the three-phase output voltage of the inverter.

[0021] The method provided by the present invention is: when one or several modules in a certain phase of the frequency converter fail and are bypassed, by adjusting the voltage setting of the power module, the line voltage of the three-phase output of the frequency converter is still kept in balance. The values ​​are equal, the phase difference is 120 degrees, and the voltage output capability is maximized.

[0022] Adjusting the voltage reference of the power module unit of the inverter can be realized through the following two specifi...

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Abstract

The invention discloses a processing method when high-voltage high-power frequency converter has failure in power module, including the following steps: 1, when the system detects a failure in some power module, it will block the output, and then triggers the bypass circuit in order to keep connection between other modules; 2, it regulates the given voltage of the power module to make keep three-phase output line voltages still balanced, that is, their amplitudes are equal, and their phases are shifted by a 120-degree angle, and enhance the voltage output ability of the frequency converter as fully as possible.

Description

technical field [0001] The present invention relates to a high-voltage high-power frequency converter composed of a plurality of power module units connected in series, and more specifically, relates to a method for enabling a high-voltage high-power frequency converter to have a higher output when one or more power modules fail . Background technique [0002] With the development of power electronics technology, as a product of the development of power electronics technology, frequency converters have been widely used in various fields of the national economy such as metallurgy, petrochemicals, tap water, electric power and other industries, and are playing an increasingly important role. Yes, the application of high-voltage and high-power inverters is becoming more and more extensive. However, by such figure 1 The high-voltage and high-power inverter composed of the power module units connected in series (such as figure 2 Shown) as an inverter suitable for China's nati...

Claims

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Application Information

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IPC IPC(8): H02M7/48
Inventor 倚鹏
Owner BEIJING LEADER & HARVEST ELECTRIC TECH
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