Fuzzy Fractional PID Torque Control Method and System for Switched Reluctance Motor

Abstract

The present invention discloses a fuzzy fractional order PID (Proportional Integral Differential) switched reluctance motor torque control method and system. A fuzzy fractional order PID controller is arranged at an outer ring, fractional differential and fractional integration are introduced in a two-dimensional fuzzy controller; and the fractional integration is employed to solve the defect that first-order pure differential is easy to be interfered by high frequency and improve the stable state precision of the system. A PID torque controller arranged at an inner ring comprises an increment PID controller, an inner ring torque hysteresis controller and a RBF (Radio Basis Function) neural network; the parameters of the increment PID controller are obtained through modeling of the RBF neural network; the modeling of the RBF neural network is and learned and completed through the difference of the output of the RBF neural network and the torque of an SRM (Switched Reluctance Motor); and the output of the increment PID controller is taken as the input signals of the inner ring toque hysteresis controller. The fuzzy fractional order PID controller arranged at the outer ring and the PID torque controller arranged at the inner ring are mutually cooperated to directly control the torque of the SRM so as to effectively reduce the torque pulsation, and the dynamic performance is good, the adaptability is high, and the realization is easy.

Description

technical field [0001] The invention relates to the technical field of control of switched reluctance motors for driving new energy vehicles, in particular to a fuzzy fractional-order PID switched reluctance motor torque control method and system. Background technique [0002] The SRM (Switched Reluctance Motor, SRM) rotor has no magnetic material, consumes less energy, and has a simple structure, high efficiency, and a wide range of speed regulation. Therefore, it is widely used in aviation, mining, and home appliances. However, SRM has the characteristics of double salient pole structure, non-sinusoidal power supply, and working in the magnetic saturation nonlinear region, which makes SRM generate large torque ripple during operation, which limits the application of SRM in special occasions such as new energy vehicles. Therefore, in SRM torque control, the research on torque ripple suppression has been a hot spot both at home and abroad. [0003] There are many different ...

AI Technical Summary

Problems solved by technology

The introduced fractional order integration is used to improve the steady-state accuracy of the system and weaken the large overshoot and low-frequency oscillation caused by integral saturation; the use of fractional order differentiation solves the disadvantage that the first-order pure differential is susceptible to high-frequency interference

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