Abstract

The electric drive of a cold pipe-rolling mill operates at a low speed with great accelerations and overloads. This mode of operation dictates increased requirements for the speed and controllability. The integration of synchronous reluctance machines (SRMs) into controlled electric drives improves the productivity of the mill and the quality of products and energy performance due to good controllability, high overload capacity, absence of losses in the rotor, and low inertia of the former. The choice of algorithms and control structures significantly affects the characteristics of the electric drive. Control structures of an independently excited electric drive are considered. Pulse-width control of a voltage inverter by forming current diagrams using a spatial vector in a rotating d–q coordinate system and direct torque control (DTC) are considered as algorithms for controlling the electric converter. Taking into account the operating modes of the electric drive and the requirements imposed on it, criteria have been formulated for comparing control systems—namely, speed of the current, flux, and torque control circuits—and losses in the electric converter are estimated by the switching frequency of the power switches. According to the results of experimental studies using mathematical models, both control systems showed similar performance capabilities. It has been shown that, in DTC systems, the switching frequency of the switches and the associated losses of the semiconductor converter decrease in the torque overload zone.

中文翻译：

---

冷轧管机电力驱动的算法和控制系统

摘要

冷轧管机的电驱动器以低速运转，并具有很大的加速度和过载。这种操作模式对速度和可控性提出了更高的要求。同步磁阻电机（SRM）集成到受控电驱动器中，具有良好的可控制性，高过载能力，转子中没有损耗以及前者的惯性低，从而提高了轧机的生产率，产品质量和能源性能。算法和控制结构的选择会严重影响电驱动器的特性。考虑了独立励磁电驱动器的控制结构。脉冲宽度的电压逆变器的控制通过在旋转成形使用空间矢量电流图d-q中坐标系和直接转矩控制（DTC）被视为控制电转换器的算法。考虑到电驱动器的工作模式及其要求，已制定了用于比较控制系统的标准，即电流，磁通和转矩控制电路的速度，并且通过电源开关的开关频率。根据使用数学模型进行的实验研究结果，两个控制系统均显示出相似的性能。已经显示出，在DTC系统中，在转矩过载区域中，开关的开关频率和半导体转换器的相关损耗减小。