High-power three-level frequency converter temperature rise and loss testing method employing active front end

Abstract

The invention relates to a high-power three-level converter temperature rise and loss testing method employing an active front end. The method is characterized by comprising the following steps of: (1) connecting a low-capacity reactor between a rectifying unit and an inverter unit of a frequency converter, and connecting a low-capacity direct-current power supply to a middle direct-current side of the frequency converter, and (2) setting the rectifying unit to operate in an inverter manner, setting an output voltage reference value of the rectifying unit and the output voltage reference value of the inverter unit at fixed values, adjusting the current which flows through the reactor, and simulating different work conditions and comprehensively testing the loss and temperature rise of the frequency converter under different work conditions by adjusting the magnitude of the output power and the power factor of the inverter unit so as to accurately estimate the output of the device. According to the invention, high-powder three-level frequency converter temperature rise and loss testing functions can be achieved by only one low-capacity reactor and one external low-capacity direct-current power supply. The method has the advantages of simple structure, accurate result, fewer used auxiliary apparatuses, easy realization and the like.

Description

technical field [0001] The invention belongs to the field of frequency converters, in particular to a high-power three-level frequency converter temperature rise and loss test method using an active front end. Background technique [0002] Frequency conversion speed regulation technology has become an important means to save energy and reduce consumption, improve process flow, improve product quality and environment, and promote technological progress in the industrial field. In recent years, with the continuous emergence of high-power power electronic devices, frequency conversion speed regulation technology More and more towards the trend of high voltage and large capacity, all kinds of MW-level inverters have been widely used in large-scale industrial production equipment, and their capacity is still increasing. [0003] One of the development directions of high-power inverters is to adopt a three-level topology. Compared with traditional two-level converters, the three-l...

AI Technical Summary

Problems solved by technology

Most of the reported test methods are aimed at power devices or power units. Usually, these methods are difficult to evaluate the overall performance of the inverter, and need to take a large power from the grid. There are problems such as complicated test methods and inaccurate test results.

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