Performance Analysis of DTC-CSI fed IPMSM Drive at Very Low Speed with Stator Resistance Compensation

Abstract

Objectives: This paper proposed to enhance the performance of Direct Torque Control (DTC) of CSI fed IPMSM drive with online stator resistances estimation of using PI controller. Methods/Analysis: Direct Torque Control (DTC) CSI fed IPMSM drives have widely used because of its high dynamic performance and no position sensor requires. This scheme is need less parameter to estimate of motor torque and stator flux linkages by using the stator quantities such as voltage and current. The estimation is dependent only the machine parameter such as stator resistance. Findings: At low speed operation the stator resistance is varying due to temperature and frequency which degrade the system performance by introducing errors in flux linkage and motor torque during estimation. Hence the stator resistance compensation is essential at low speed. The error between estimated stator flux and its reference value are used to estimate the stator resistance by using PI controller. For the first time, it is demonstrated in this paper for DTC with CSI fed IPMSM drive system. Conclusion/Application: It is demonstrated for the first time for DTC with CSI fed IPMSM drives. The performance of the stator resistance estimators and torque and flux responses of the drive are investigated with the help of MATLAB/SIMULINK software and hardware. The results show that the proposed methods ensure the reliable and high-performance operation of the drive.