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METHOD FOR DIRECT CONTROL OF ACTIVE AND REACTIVE POWER FROM THE ROTOR SIDE FOR A GRID-CONNECTED DOUBLY-FED SLIP-RING INDUCTION MACHINE WITHOUT POSITION ENCODER
METHOD FOR DIRECT CONTROL OF ACTIVE AND REACTIVE POWER FROM THE ROTOR SIDE FOR A GRID-CONNECTED DOUBLY-FED SLIP-RING INDUCTION MACHINE WITHOUT POSITION ENCODER
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机译:无位置编码器的并网双馈滑环感应电机转子侧有功和无功直接控制方法
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摘要
A method of direct power control for doubly-fed wound rotor induction machine is described. The stator active and reactive powers are controlled within hysteresis bands by adopting a switching algorithm on the rotor side. The control algorithm uses only stator quantities for active and reactive power measurement and is inherently position sensorless. It is computational/y simple and does not involve any machine parameter. A novel method for sector identification of the rotor flux based on the direction of change of reactive power is developed. The algorithm can start 'on-the-fly' and runs stably even at zero rotor frequency. Fast and decoupled dynamic response of the stator active and reactive powers is achieved. The direct power control method can be used for sensor/ess control of wound rotor induction machines in high power drives and VSCF applications like wind power generation.
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