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Direct Torque Control Scheme for DC Voltage Regulation of the Standalone DFIG-DC System

机译:独立DFIG-DC系统的直流电压调节直接转矩控制方案

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This paper deals with a standalone doubly fed induction generator-direct current (DFIG-dc) system, where stator and rotor are connected to an isolated dc load, via diode rectifier and voltage-source inverter, respectively. A direct torque control scheme is proposed for dc voltage regulation, where the dc voltage is regulated by a torque controller, while stator frequency is maintained at a nearly rated frequency, by achieving constant dc voltage to rotor flux ratio. An innovative switching strategy is developed to incorporate the phase sequence change in rotor current from subsynchronous speed to supersynchronous speed. Variable switching due to a hysteresis controller provides a reduction in the harmonic content of stator current. This control is simple in implementation, and less parameter dependent. There is no requirement of exact position sensing, while the speed measurement is sufficient, which also reduces the cost and maintenance of an accurate position sensor. Sensing of stator voltage and current is not required in this scheme, and control is done with a minimum number of sensors. As the number of turns on the stator is higher than the rotor, to have common dc link and to exploit rated stator MMF, roles of stator and rotor are interchanged. Performance of the control scheme is verified experimentally on a 4 kW DFIG, and results are reported.
机译:本文研究了一个独立的双馈感应发电机-直流电(DFIG-dc)系统,其中定子和转子分别通过二极管整流器和电压源逆变器连接到隔离的直流负载。提出了用于直流电压调节的直接转矩控制方案,该方案通过转矩控制器调节直流电压,同时通过实现恒定的直流电压与转子磁通之比,将定子频率保持在接近额定频率。开发了一种创新的开关策略,将转子电流中的相序变化从次同步速度合并到超同步速度。磁滞控制器带来的可变开关可降低定子电流的谐波含量。该控件实现简单,参数依赖性小。不需要精确的位置检测,而速度测量就足够了,这也降低了成本和维护精确的位置传感器。在此方案中,不需要感应定子电压和电流,并且使用最少数量的传感器进行控制。由于定子上的匝数高于转子,要有通用的直流母线并利用额定定子MMF,定子和转子的作用会互换。该控制方案的性能在4 kW DFIG上进行了实验验证,并报告了结果。

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