Automated QFT-Based PI Tuning for Speed Control of SynRM Drive with Analytical Selection of QFT Control Specifications

Rajesh Poola,Tsuyoshi Hanamoto

doi:10.3390/en15020642

Rajesh Poola, Tsuyoshi Hanamoto

Open Access

https://doi.org/10.3390/en15020642

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Journal: Energies	Publication Date: Jan 17, 2022
Citations: 2	License type: CC BY 4.0

Affiliation: Kyushu Institute of Technology

Abstract

The gains of PI controllers, used in the cascaded speed control of synchronous reluctance motors (SynRMs), are synthesized using quantitative feedback theory (QFT). A systematic design approach is employed to quantitatively determine the PI controller gains in terms of speed and current loops, using a mathematical model of the SynRM. Further, to make the QFT design a more transparent method, an analytical procedure using the frequency domain is attempted to design the QFT bounds as well as the initial search space of the optimization algorithm used in automatic loop shaping. The effectiveness of the proposed PI tuning method is verified with the extensive MATLAB/Simulink simulation environment. The results illustrate the supremacy of the proposed PI tuning method, in terms of control performance, over the conventional PI tuning method, using the analytical procedure.

Highlights

Synchronous reluctance motors (SynRMs) have recently received a significant amount of attention due to their low cost, durability, and high reliability, and their good torque performance and power efficiency
This paper addresses the following: (i) the tuning of proportional integral (PI) controller gains for robust speed and current control of synchronous reluctance motors (SynRMs) under the variation of inductance (Ld, Lq ) using quantitative feedback theory (QFT), (ii) the creation of a thorough analytical procedure to select the performance bounds in QFT, and (iii) the selection of the stable PI gain region for the initial search space of the optimization algorithm used for the automated QFT
The QFT has enabled us to incorporate the nonlinear behavior of the SynRM inductances using the multiple linear plant models that have resulted from the parametric variation in the SynRM

Summary

Introduction

Synchronous reluctance motors (SynRMs) have recently received a significant amount of attention due to their low cost, durability, and high reliability, and their good torque performance and power efficiency. The significant drawbacks of PMSMs, such as the need for high-cost rare-earth magnets in the rotor and the need for demagnetization, SynRMs are more prominent than PMSMs [5,6] These advantages of SynRMs encourage their use in various small and medium-sized power applications, such as in fans, pumps, elevators, etc. Due to their peculiar rotor structure and the high nonlinearity in rotor flux linkages caused by cross-magnetization currents, the speed control strategies of these SynRMs need to be more robust in nature [7]

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