Study of Star-Delta Soft Switch to Extend AC Motor High Speed Operation Region

Yixuan Shuai;Dong Jiang;Zhuo Chen;Zicheng Liu;Haijing Sun;Peng Li
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Abstract

In traction application, speed range of motor is an important index for motor drives. In AC motor control, the maximum speed of the motor is limited by the output voltage capability of the traditional three-phase inverter with star connenction of windings. Switching the star connection to delta connection in high-speed range can extend the speed range. In order to extend the speed operation region, star-delta switch proposed by many literatures relies on mechanical relay, which needs a dead zone of tens of milliseconds and seriously affects torque output. Besides, the traditional method will cause current overshoot during the switch transient process, decreasing the device security and reliability. Aiming at the defects existing in the star-delta hard switching, this paper proposes a star-delta soft switching method. Without adding extra power electronics devices, DC-bus capacitor is used to provide the path of zero axis current in the transient process, which helps to achieve the smooth torque output and zero current switch in the transient. Experiments have been done to validate the performance of the proposed method. The switching transient from star to delta connection in the motor drive can be much more stable than hard switching method.
星三角软开关扩展交流电机高速运行区域的研究
在牵引应用中,电机的转速范围是电机传动的一个重要指标。在交流电机控制中,传统的星形绕组三相逆变器的输出电压能力限制了电机的最大转速。在高速范围内将星形连接切换为三角形连接可以扩展速度范围。为了扩展速度操作区域,许多文献提出的星三角开关依赖于机械继电器,该继电器需要数十毫秒的死区,并且严重影响转矩输出。此外,传统方法在开关瞬态过程中会引起电流过冲,降低器件的安全性和可靠性。针对星三角硬切换存在的缺陷,提出了一种星三角软切换方法。在不增加额外功率电子设备的情况下,直流母线电容器用于在瞬态过程中提供零轴电流的路径,有助于在瞬态中实现平稳的转矩输出和零电流切换。实验验证了该方法的性能。在电机驱动中,从星形到三角形连接的切换瞬态可以比硬切换方法稳定得多。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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