A speed-sensorless startup method of an induction motor driven by a modular multilevel cascade inverter (MMCI-DSCC)
A speed-sensorless startup method of an induction motor driven by a modular multilevel cascade inverter (MMCI-DSCC)
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DOI：
10.1109/ecce.2013.6646879
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发表时间：
2013-10
期刊：
影响因子：
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通讯作者：
Y. Okazaki;M. Hagiwara;H. Akagi
中科院分区：
文献类型：
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作者：
Y. Okazaki;M. Hagiwara;H. Akagi
基于双星斩波单元的模块化多电平级联逆变器（MMCI DSCC）被认为是下一代中压电机驱动多电平PWM逆变器之一。本文从理论和实验两个方面讨论了一种实用的无速度传感器起动方法，用于MMCI-DSCC驱动的感应电动机从静止到中速的起动。这种电机驱动器特别适用于大容量风扇/鼓风机类负载，其扭矩与电机机械速度的平方成比例。与所谓的“伏特每赫兹”或“转差频率”控制不同，三相定子电流基于“反馈”控制，而其幅度和频率基于“前馈”控制。虽然电机驱动器没有速度传感器连接到电机轴上，但这种方法在定子电流反馈回路的帮助下使缓慢启动稳定。从一个400 V，15千瓦缩小系统的实验结果验证稳定的运行性能，从静止到588 min-1的中速加载60%。
The modular multilevel cascade inverter based on double-star chopper-cells (MMCI-DSCC) has been expected as one of the next-generation multilevel PWM inverters for mediumvoltage motor drives. This paper has theoretical and experimental discussions on a practical speed-sensorless startup method for an induction motor driven by the MMCI-DSCC from the standstill to a middle speed. This motor drive is suitable, especially for large-capacity fan-/blower-like loads, the torque of which is proportional to a square of the motor mechanical speed. Unlike the so-called “voltz-per-heltz” or “slip-frequency” controls, three-phase stator currents are based on “feedback” control, whereas their amplitude and frequency are based on “feedforward” control. Although the motor drive has no speed sensor attached to the motor shaft, this method makes a slow startup stable with the help of a stator-current feedback loop. Experimental results obtained from a 400-V, 15-kW downscaled system verify stable operating performance from the standstill to a middle speed of 588 min-1 loaded with 60%.