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

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...

AI Technical Summary

Problems solved by technology

Although this method achieves the purpose of balancing the three-phase output voltage of the inverter, it reduces the rated value of the output voltage of the inverter and sacrifices normal and good power module units.

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