A Sensorless Control System Based on Velocity Loop Fuzzy Control and High Frequency Injection Method

Abstract

The invention discloses a speed ring fuzzy control and high-frequency injection method-based sensorless control system, which comprises a PMSM module, a Clark transformation module, a Park transformation module, a rotor parameter estimation module, a high-frequency signal injection module, a first comparator module, a fuzzy controller module, an MTPA module, a second comparator module, a first PI adjusting module, a third comparator module, a second PI adjusting module, a Park inverse transformation module, an SVPWM module and an inverter module. In rotor angle and rotating speed estimation, a high-frequency signal injection method is especially suitable for a zero speed and a low speed, and meanwhile, a traditional PI speed adjuster is replaced with a fuzzy controller. In a permanent magnet synchronous motor vector control system, the robustness of fuzzy control is high, the interference and the influence of a parameter change on the control effect are greatly reduced, the sensorless control system is especially suitable for control on nonlinear, time-varying and pure delay systems, simulation of manual control process and method is facilitated and the adaptive capacity of the control system is strengthened.

Description

technical field [0001] The invention relates to the technical field of speed sensorless speed measurement, in particular to a sensorless control system based on speed loop fuzzy control and high frequency injection method. Background technique [0002] Permanent Magnet Synchronous Motor (PMSM) has the advantages of high power density, high energy conversion efficiency, wide speed range, small size, light weight, etc., and has been widely used in industrial, civil, military and other fields. [0003] The control of the permanent magnet synchronous motor needs to obtain the position and speed information of the motor rotor. At present, the commonly used position sensors include photoelectric encoders, resolvers and other devices. The use of these devices not only increases the size and cost of the system, but also reduces the system cost. It also limits the application of permanent magnet synchronous motors in special environments. In order to solve many defects caused by mech...

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Problems solved by technology

[0005] In order to overcome the existing problems of the rotor angle and rotational speed estimation method of the permanent magnet synchronous motor based on the speed sensor, the principle is complicated, the calculation amount is large, and the integral saturation is solved. A sensorless control system based on speed loop fuzzy control and high-frequency injection method. The proportional integral coefficient of the PI regulator is adjusted through the fuzzy controller so that the PI regulator can have good dynamic performance in a wide speed range of the motor. Steady state performance

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