Position sensorless model predictive control system and method for vehicle permanent magnet synchronous motor

Abstract

The invention relates to a sensorless model predictive control system and a method of a permanent magnet synchronous motor for vehicles. The system comprises a maximum torque-current ratio controllerfor obtaining a reference value of a stator current; Stator current feedback module: acquiring a stator current feedback value; A position observer module for observing the rotational speed and the rotor position angle of the permanent magnet synchronous motor; A current predictive control module, which performs current predictive control according to the stator current reference value, the statorcurrent feedback value, the speed of the permanent magnet synchronous motor and the rotor position and outputs a stator voltage reference value; A rotating high-frequency voltage injection module that generates a rotating high-frequency voltage signal and superimposes the rotating high-frequency voltage signal and a stator voltage reference value to obtain a control voltage; SVPWM modulation module: SVPWM modulation of the control voltage to obtain inverter control signal, inverter connected to the permanent magnet synchronous motor. Compared with the prior art, the invention not only can realize the optimization of the current control performance, but also can simplify the controller hardware and improve the reliability of the control system.

Description

technical field [0001] The invention relates to a vehicle permanent magnet synchronous motor control technology, in particular to a vehicle permanent magnet synchronous motor model predictive control system and method without a position sensor. Background technique [0002] In today's automobile industry, resource waste and environmental pollution are the main problems affecting its development, so countries have accelerated the development of new energy vehicles. Among them, electric vehicles are powered by vehicle-mounted power supplies, and use motors to convert electrical energy into mechanical energy to provide source power to drive wheels, which is more environmentally friendly and has good development prospects. Permanent magnet synchronous motor (PMSM) is widely used in the field of electric vehicle drive system due to its high power density, high output torque, high efficiency and other characteristics. Various control techniques for permanent magnet synchronous mo...

AI Technical Summary

Problems solved by technology

However, the existing position sensorless technology is generally based on the vector control system, and there are still defects in the vector control technology.

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