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A new method for controlling an induction motor using a hybrid discretization model predictive field orientated

Hasan Alqaraghuli¹, Abdul Rashid Husain¹, Nik Rumzi Bin Nik Idris¹

¹School of Electrical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Johor Bahru, Malaysia.

|June 16, 2022

Summary

A new Hybrid Discretisation Technique (HDT) improves Model Predictive Field Oriented Control (MPFOC) for Induction Motors (IM). This method reduces torque ripple and enhances load handling, offering better dynamic performance.

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Area of Science:

Electrical Engineering
Control Systems
Power Electronics

Background:

Model Predictive Control (MPC) performance in Induction Motors (IM) depends on Discretisation Technique (DT) accuracy and efficiency.
Traditional methods like Euler's offer speed but lack accuracy, while Heun's method improves accuracy at the cost of speed.
Inaccurate or slow discretisation leads to high torque ripple and reduced load handling in MPC-controlled IMs.

Purpose of the Study:

To introduce a novel Hybrid Discretisation Technique (HDT) for Model Predictive Field Oriented Control (MPFOC) in IMs.
To achieve robust discretisation with enhanced accuracy and computational efficiency.
To validate the proposed HDT's effectiveness in improving IM dynamic performance.

Main Methods:

Developed a Hybrid Discretisation Technique (HDT) combining Euler's method for initial samples and a predictor-corrector approach for subsequent samples.
Implemented the HDT within the MPFOC framework for a three-phase IM.
Verified the system using Processor-In-Loop (PIL) simulation under varying load conditions and bi-directional rotation.

Main Results:

The proposed HDT reduced IM torque ripple by up to 20%.
Load handling capability was improved by up to 10%.
Controller performance showed a 20% improvement in rise time and a 23% improvement in settling time under high load conditions compared to Euler and Heun methods.

Conclusions:

The Hybrid Discretisation Technique (HDT) offers a superior approach for MPFOC in IMs, balancing speed and accuracy.
HDT significantly enhances IM dynamic performance, reducing torque ripple and improving load handling.
This technique provides a practical solution for achieving robust and efficient IM control systems.