Parameter self-adjusting fuzzy control dc pulse width speed control system

High performance dc pulse width speed control system has been widely used, and the fuzzy controller because do not depend on the object accurate mathematical model, and has strong robustness, so it in industrial control has been widely used in the field. However simple fuzzy control steady-state accuracy is poor, poor dynamic performance. This is mainly the fuzzy rules vulnerable people's subjective influence, make the controller is limited to rotary joints not more than experts experience under the condition of the scope of application, and the control system of nonlinear, degeneration caused the fuzzy control rules not perfect, influence the control effect. In order to
rotary union overcome these problems, is about to make fuzzy controller with adaptive, from the function of adjustment. This paper adopted the scale factor fuzzy self-tuning adaptive method, by making the parameters of the fuzzy controller in control process automatically adjust, modification and perfection of the fuzzy controller to improve the adaptability and dynamic and static quality, in order to achieve more ideal control effect. Applied to dc pulse width speed regulation system, and the results show that it can significantly improve the system performance.
1, system composition and characteristics
The traditional double closed loop speed regulation systems is starting process is saturated nonlinear control. When the speed regulator ASR saturated and unsaturated, the whole system show totally different structure of the linear system. And the actual system has a few little time constant of the inertial links, such as power converter lag time constant, current and speed detection filtering time constant, etc., there are certain transmission lag. Visible dc pulse width speed control system is a nonlinear, time-varying parameters, the existence of the disturbance of the system, with the traditional control mode is difficult to achieve the best control effect.
Figure 1 zone self-adjusting fuzzy controller dc speed control system diagram
According to the current, speed double closed-loop dc pulse width speed control system is adopted in this paper, a fuzzy logic controller as speed regulator, as shown in figure 1 shows. To keep system anti-interference ability and rapidity good features, current regulator ACR using position type PI control algorithm. System main circuit adopts H type power amplification circuit.
2, quantization factor and scaling factor to
fiber optic rotary joint influence on the system's performance analysis
The conventional fuzzy controller usually select error and error rate as input variables and the output of fuzzy controller by the integral of the system after as control quantity, thus constituted two-dimensional fuzzy PI type structure of fuzzy controller, as shown in figure 2 shows.