Abstract
For the pulling in performance of synchronous motors, it is desired generally to improve the limit of synchronization and to eliminate the rotor transients as fast as possible. Since the system of the motor is represented with a nonlinear differential equations, the analysis of pulling-into-step phenomena is difficult to treat quantitatively by conventional methods. In this paper, a method is presented for deciding the most favorable angle to improve the synchronization by using performance index and the on-off excitation control is proposed for removing rotor transients. A Lyapunov function is used for performance index, which can evaluate the stability of a nonlinear system. The most favorable angle and the instants of the excitation control can be derived quickly even in on-line system. The on-off excitation control is a new control strategy differing from conventional optimal control method, that is valuable for implementation to remove rotor transients. The proposed method is applied to the practical system, and the possibility to improve the synchronism is shown experimentally.
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