Qiu Ruichang

Simulation and Experiment Research on 3-Phase Asynchronous Motor Softstarting and Energy-saving Control

Using the SABER simulation software, this paper is focused on the effect of the input voltage on the motors energy loss and power factor in 3-phase AC voltage regulation circuit, which is regulated by the control angle of the SCR. Simulation and experiment results are given. It is proved that using this simple voltage regulation circuit can adjust the motors terminal voltage, satisfy the requirement of soft-starting, and simultaneously save energy by using a proper algorithm (constant power factor algorithm to control the firing angle of SCR)

Research on rotor EMF-oriented doubly fed motor without position sensors for wind-energy generation

In this paper, a vector control strategy of the doubly fed induction generator using rotor EMF-oriented position sensorless scheme is proposed. Compared with the other position sensorless schemes, the proposed control method only uses the rotor voltage and current as the feedback signals, which substantially reduces the costs and enhances the reliability of the control of the generator. The finite impulse response filter (FIR) is used in the rotor EMF orientation. Simulation shows good response of the system. Experiments based on a 3 kW unit demonstrate the correctness and availability of the scheme