Abstract

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.

中文翻译：

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异步电动机在变频器和供电网络之间软开关的同步算法

摘要

一种基于带有自动电压逆变器的变频器的异步电驱动器被认为既可以用作一组技术单元的频率控制站的一部分，也可以用作单个电驱动器。提出了一种在变频器和供电网络之间实现感应电机软开关功能的方法。对与感应电机电源电压损失相关的过程进行了分析。简要分析了工业中用于在供电网络和变频器之间切换电机负载的方法，并简要讨论了它们的适用范围。提出了一种在供电网络和变频器之间自动软切换异步电动机的算法。考虑了这种电力驱动的电源方案以及控制系统的框图，这允许实施所提出的算法方法。介绍了计算变频器输出电压幅值和相位调节器的方法。对控制算法进行仿真，验证其可操作性和可行性。