Method for building artificial fish swarm algorithm fractional order PID controller of axial mixing magnetic bearing

Abstract

The invention discloses a method for building an artificial fish swarm algorithm fractional order PID controller of an axial mixing magnetic bearing. The method for building the artificial fish swarm algorithm fractional order PID controller of the axial mixing magnetic bearing comprises the steps that (1) comparison is carried out between an axial displacement signal of the axial mixing magnetic bearing and a given displacement reference position signal to obtain a displacement deviation signal, the displacement deviation signal is input into a conventional fractional order PID controller; (2) fish swarm scale, a sight range, a moving step length, a crowding degree factor, a maximum attempt limit and maximum iterations are set; (3) the states of each artificial fish include a proportion coefficient, an integral coefficient, a differential coefficient, a differential degree coefficient and an integral degree coefficient; (4) calculation is carried out on an initial fish swarm, current-moment artificial fish food concentration, a fish swarm visual field and a step length; (5) each artificial fish carries out foraging calculation, gathering calculation, and tailgating calculation to update the position of the artificial fish, and finally outputs an optimal parameter. The method for building the artificial fish swarm algorithm fractional order PID controller of the axial mixing magnetic bearing integrates the advantages of an artificial fish swarm algorithm and the advantages of the fractional order PID controller, real-time optimization is carried out on parameters of the fractional order PID controller according to performance indexes of a system, the system can have better static stability and better dynamic stability, and the self-adaptation capacity of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of control, and in particular relates to the design of a control system and a control method of a non-mechanical contact magnetic suspension bearing (magnetic bearing). Background technique [0002] Axial hybrid magnetic bearing is a kind of magnetic bearing in which the control magnetic flux is generated by the control coil and the bias magnetic flux is generated by the permanent magnet, so that the rotor is suspended in space. It has the advantages of controllable suspension force, high precision, adjustable stiffness, low power consumption Low cost, low cost, good space heat dissipation and other advantages. At present, the control system of axial hybrid magnetic bearing mostly adopts the classic integer-order PID controller to control it, but this method relies too much on the model parameters of the control object, and its robustness is poor. It is difficult to meet the requirements of precise control ...

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Problems solved by technology

According to domestic and foreign literature, for the control system of axial hybrid magnetic bearing, the design of fractional order PID controller using fish swarm algorithm has not been reported yet

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