Algorithms for controlling autonomous voltage inverters of frequency converters

Abstract

The article proposes the development of control algorithms for autonomous voltage inverters. The key elements of the frequency converter inverter are IGBT transistors. Compared to other electronic keys, they have a higher speed and the possibility of manufacturing a module of six transistors and diodes. The proposed converter algorithms will make it possible to understand physical processes in converters, to correctly design, diagnose and operate such devices. The frequency converter is made on the basis of the latest integrated power modules IPM (Intelligent Power Module), which contain 6 IGBT transistors and their control circuits with a system of protection against short circuits and thermal protection. Output voltage modulation control is implemented programmatically using microcontrollers. The inverter uses a modified modulation, the so-called "voltage vector orientation". This contributes to the full use of the inverter's capabilities. The device can operate in the mode of linear or quadratic U/f characteristics. These characteristics make it possible to vary the rotation speed of asynchronous motors within wide limits, which is important for drive various mechanisms and will ultimately improve the economic and energy performance of the electric drive. Currently, the main power electronics devices in the field of switching currents up to 50 A are insulated gate bipolar transistors (IGBT).