This paper presents a method to control the speed of doubly fed induction motors. The motivation lies in the possible use of such motors for hybrid electric propulsion. The stator of the motor is assumed to be supplied by three-phase voltages with frequency and magnitude that may vary. The rotor is supplied by a bidirectional converter. Two versions of the algorithm are presented. The first version does not rely on inner current loops, but instead commands directly the voltages applied to the rotor. These voltages are computed using an open-loop controller for torque and for stator reactive power, which is augmented to follow a speed reference profile. The second version uses stator and rotor current measurements to ensure tracking and limiting of the rotor currents. All the parameters of the control systems can be computed based on estimates of the machine parameters together with a desired time constant of the speed response. The alignment of an incremental encoder is integrated in the initialization of the algorithm. Practical implementation and testing are performed easily and rapidly. Experiments performed on a small-scale laboratory testbed show very good tracking performance of a speed profile in tests involving one motor, as well as two motors on a single three-phase supply. Improved current limiting is observed with the version incorporating current feedback.

中文翻译：

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带和不带电流反馈的双馈感应电动机的速度控制

本文提出了一种控制双馈感应电动机速度的方法。动机在于可能将这种电动机用于混合电力推进。假定电动机的定子由频率和幅度可能变化的三相电压供电。转子由双向转换器供电。介绍了该算法的两个版本。第一个版本不依赖于内部电流回路，而是直接命令施加到转子的电压。使用开环控制器来计算这些电压，以用于转矩和定子无功功率，并增加其以遵循速度参考曲线。第二种版本使用定子和转子电流测量来确保跟踪和限制转子电流。可以基于机器参数的估计值以及速度响应的期望时间常数来计算控制系统的所有参数。增量编码器的对齐方式集成在算法的初始化中。可以轻松，快速地进行实际的实施和测试。在小型实验室测试台上进行的实验显示，在涉及一个电机以及单个三相电源上的两个电机的测试中，速度曲线具有很好的跟踪性能。结合电流反馈的版本改善了电流限制。在小型实验室测试台上进行的实验显示，在涉及一个电机以及单个三相电源上的两个电机的测试中，速度曲线具有很好的跟踪性能。结合电流反馈的版本改善了电流限制。在小型实验室测试台上进行的实验显示，在涉及一个电机以及单个三相电源上的两个电机的测试中，速度曲线具有很好的跟踪性能。结合电流反馈的版本改善了电流限制。