Development of power saving electric drives with automatic variation of coordinate controlled with excitation circuit

The paper provides main technical solutions for the developed concept of power saving DC thyristor electric drives equipped with two-region speed control. The concept is based on rearranging reserve of the rectified EDV of the thyristor converter (TC) in steady-state and dynamic modes. The complex of thyristor electric drives developed within the framework of the main concept for the wide-strip hot-rolling mills ensures improved power indexes. This is enabled due to automatic switching the coordinate controlled with excitation circuit and automatic change of the EDV control system configuration. The authors offer flowcharts of the developed solutions. Time diagrams and oscyllograph records of electric drive coordinate variations are used for explanation purposes.