A Method for Constructing a Three-phase Aircraft Network Stabilized in Frequency and Voltage with an Asynchronous Generator on the Turbine Shaft

Abstract

Frequency converters with various designs of the power circuit are widely used for supplying power to autonomous objects (e.g. aircraft, helicopters, etc.). Three-phase generators with variable frequency and voltage level, which are as a rule installed on the jet turbine shaft, behave as primary sources of electric power in this case. To obtain a stabilized three-phase output voltage, a two-level converter circuit has been widely used, which consists of an uncontrolled rectifier, a DC link, and a voltage-source inverter. Recent years have seen an interest in using direct frequency converters, in which the primary "poor" network is transformed into a stabilized secondary network within a single stage. To this end, modern topologies of the power circuit and algorithms for its control are used. The essential advantages of direct frequency converters are that they do not contain a DC link with bulky electrolytic capacitors of large capacitance, and their ability to perform energy conversion in one stage. Of particular interest is the possibility of using an asynchronous generator as the primary source of the onboard network. By combining it with a matrix direct frequency converter, in which the switch control algorithm developed by the authors is used, it becomes possible to obtain a high-quality on-board network for autonomous objects, which is stabilized in amplitude and frequency.