Synchronous reluctance motor sensorless direct torque control system based on power compensation

Abstract

The invention provides a synchronous reluctance motor sensorless direct torque control system based on power compensation. The system comprises a first subtractor, a first PI module, a second subtractor, a first adder, a torque hysteresis module, a third subtractor, a switch table module, a switch table module, a magnetic linkage hysteresis module, a second adder, a rectifier / inverter module, a stator voltage vector calculation module, a stator magnetic linkage and rotating speed estimating module, an actual motor torque calculation and angle compensation module based on active power calculation, a magnetic linkage given amplitude compensation module based on reactive power calculation, a stator current vector transformation module and a synchronous reluctance motor. The power output capacity of the system is improved by the method that a reactive power calculation output value compensates flux linkage stator flux linkage and an active power calculation output value compensates statorflux linkage angles.

Description

technical field [0001] The invention relates to a synchronous reluctance motor control system, in particular to a sensorless direct torque control system of a synchronous reluctance motor based on power compensation. Background technique [0002] In recent years, with the continuous rise of rare earth prices, the manufacturing cost of permanent magnet synchronous motors with magnetic steel in the rotor is also increasing, while the synchronous reluctance motor (SynRM) has lower cost and low efficiency because of its rotor without permanent magnets. Due to the advantages between asynchronous motors and permanent magnet synchronous motors, it has been regarded as an ideal motor to replace permanent magnet synchronous motors and asynchronous motors, and finding a method suitable for sensorless control of synchronous reluctance motors has become a current research topic. specialty. [0003] At present, scholars at home and abroad have carried out some research on this, such as ...

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Problems solved by technology

However, this document uses a voltage-current observation model for the observation of the stator flux linkage. Since the model uses a pure integral link, a small DC bias will eventually lead to integral saturation, resulting in the amplitude and phase deviation of the flux linkage observation. In turn, the deviation of torque observation is caused, so the system using this method has problems such as small starting torque and weak load capacity.

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