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This paper presents the sensorless control method that employs the adaptive back-EMF(Electromotive Force) and current model observer(CMO) of interior permanent magnet synchronous motor(IPMSM) with improved instantaneous reactive power compensator(IRP). The estimated back EMF considering a saliency is obtained by using the adaptive control method. The estimated EMF is inputted to the CMO for estimating...
This paper proposes a sensorless V/f control method of the surface mounted permanent magnet synchronous motor without damper windings. Arithmetic computation is simpler than vector control. And the low cost price, dynamics and stability is guaranteed. When the loss of synchronization occurs with the load disturbances, the stability loop with a reduced order observer is applied quickly and accurately...
This paper proposes that direct torque control of interior permanent magnet synchronous motors (IPMSM) using a sliding mode observer (SMO). The sigmoid function is used to decrease the chattering as the switching model. This function is more effective than the unit step function to decrease the chattering. The back-EMF component of the motor is observed for robust sensorless control. The rotor position...
Most of the Maximum Power Point Tracking(MPPT) controls for a wind generation system are based on the unknown wind speed. In these methods, a Power Signal Feedback(PSF) method, an optimal Tip Speed Ratio(TSR) method and a Perturbation & Observation(P&O) method are used. However, in this paper, an estimating technique of the wind speed using the efficiency curve of the blade is proposed. By...
A Light Emitting Diodes(LED) lighting is increasingly used because of its low power consumption and long lifetime. Of many power converters, a flyback converter is applied for the LED lightings and has some electrolytic capacitors for stabilizing the output voltage. But the expected life span of the electrolytic capacitors is much shorter than that of the LED elements. It makes the lifetime of the...
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