A Novel Fast Speed Regulation Control Strategy for VVVF in HVF

This paper introduces a new fast speed regulation control strategy for HVF (high voltage frequency-converters) to facilitate the squirrel cage AC-motor reacting possibly fastest to the speed commands without over-current and instability. The basic principal is to regulate the frequency to follow the target currents which again follow the desired torques determined by the mechanical character of the load using the PI controller. Other aspects like electromagnetic torques instability and different loads are also taken into consideration. The result from simulation by PSCAD shows that by using this strategy, the motor can response to the speed commends much more quickly.