关键词：同步电动机；模糊 PI 控制器；推进系统；调速系统；螺旋桨
Abstract
The general PI control method is widely applied in the field of industrial process. The
method is simple, adaptable and it can meet with the demands of the general industrial
control process. But it has some problem in control characteristics, such as the parameter
of PI is the best in one status but not good in another status and the control characteristics
are not perfect to the object which is nonlinear. In this paper the fuzzy-PI control method is
introduced to the system of electrical propulsion to improve the dynamic and steady
characteristics.
This paper studies the AC/AC variable frequency converter speed-regulated system of
synchronous motor and the nonlinear object—propeller. Establish the mathematic models
on the base of piece-wise linearization of propeller.
That provides the foundation for the simulation and improving the quality.
In this paper the fuzzy-PI control strategy is proposed, and the rules of the fuzzy-PI
controller are established. Basing on this the mathematic models of propulsion system is
established. Some comparisons are made about the propeller’s characteristics of start-up,
crash reversal, anti-interference and the sensitivity to the PI parameter through a series of
simulation. The simulation results show that the fuzzy-PI controller is much more
advanced than the traditional PI controller.
