An asynchronous electric drive based on a frequency converter with an automatic voltage inverter is considered that can be used both as part of a frequency-control station for a group of technological units and as a single electric drive. An approach is proposed to implementing the function of soft switching of an induction motor between the frequency converter and the supply network. The analysis of the processes associated with loss of the power supply voltage of a induction machine is performed. A brief analysis of the methods used in industry for switching the motor load between the supply network and the frequency converter is presented, and the range of their applicability is briefly discussed. An algorithm for automatic soft switching of an asynchronous motor between the supply network and the frequency converter is proposed. The power scheme of such an electric drive is considered, as well as the block diagram of the control system, which allows implementing the proposed algorithmic approach. The method of calculation of the frequency converter output voltage amplitude and phase regulators is presented. Simulation of control algorithms is performed, verifying their operability and feasibility.
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Domakhin et al. (2021) studied this question.
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