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This paper presents a new compensation method about speed sensorless vector control of induction motor(IM). The proposed method calculates a direction of the flux by reducing the q-axis flux to zero which is obtained a flux observer. In order to stabilize the system at regenerating operation, a new compensation method is proposed. The effectiveness of proposed compensation method is confirmed by stability...
This paper presents a new simplified sensorless speed control method of induction motors (IM). The output voltage of d-axis PI current controller is used to compute the flux angle and to control the speed in correspondence with its reference. The effectiveness of the proposed method has been demonstrated by simulations considered PWM and experiments.
Power flow control for the distributed generator (DG) with Electric Double Layer Capacitor (EDLC) is studied. The DG system consists of a voltage type inverter for connection to the AC-line and a two-quadrant DC chopper for connection to the DC-bus. The inverter and the DC chopper can be controlled cooperatively to regulate active power flow. The active power from DG to AC line is regulated by the...
This paper presents a sensorless vector control system of permanent magnet synchronous motor based on adaptive and fuzzy control. The proposed system is constructed in an arbitrary rotating reference frame and the speed estimator is based on the adaptive theory using the current error. Additionally, the fuzzy control theory is applied to this system for improving the stability and dynamic performance...
A preliminary structure model for the new unit cell (orthorhombic, a=1.487nm; b=0.572nm; c(chainaxis)=1.258nm) of poly(p-hydroxybenzoic acid) whisker crystals was proposed on the basis of energy calculations, assuming the space group to be Pbca as the highest one. First, the torsion angle of phenyl ring and mutual shift of molecular stems along the chain direction were varied, and several models were...
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