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This paper proposes, for variable-speed, grid-connected doubly fed induction generator (DFIG), a slip angle estimator, which is based on rotor current estimation in the synchronous reference frame. This estimator eliminates the need for a speed sensor or a rotor position encoder. The proposed estimator eliminates the need for an integrator to estimate the stator flux and, compared with other model-based...
An electronic circuit in a control panel installed in a substation for Japanese bullet train (Shinkansen) was damaged due to a lightning. A field test is carried out to clarify the cause of the failure. The results show that a voltage is induced on a control cable for a earthing system and its amplitude exceeds the lightning withstand voltage of the control circuit. The effect of an earthing of an...
Stepping motors are used for high precision and low cost positioning motor which can be controlled with no feedback control. So it is used in OA (Office Automation) and FA (Factory Automation) applications. However, because of open-loop control, the motor may rotate in the wrong direction temporarily when it starts. This problem can be resolved through using initial rotor position estimation. To estimate...
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