Objectives: This paper proposed to enhance the performance of
Direct Torque Control (DTC) CSI fed Interior Permanent Magnet Synchronous Motor
(IPMSM) drive with online stator resistances estimation using a PI controller.
Background: In CSI drives, the DC link reactor limits the rate of
rise of current under short circuit conditions, so the drives can be easily
protected under short circuits and thus result in improved reliability of the
drive.
Methods/Analysis: Direct Torque Control (DTC) CSI fed IPMSM drives
are widely used in the industry because of their high dynamic performance and
the need for position sensors. This method needs fewer parameters to estimate
the motor torque and stator flux linkages. The estimation is dependent only on
the machine parameter such as stator resistance.
Results: At low-speed operation, the stator resistance varies due
to temperature and frequency, which degrades the system performance by
introducing errors in flux linkage and motor torque. Hence the stator
resistance compensation is essential at low speed. The error between the
estimated stator flux and its reference value is used to estimate the stator
resistance by using the PI controller. For the first time, it is demonstrated
in this paper for the DTC - CSI fed IPMSM drive system. Due to the change in stator
resistance, the parameter stator flux and electric torque mismatch between the
set value and estimated value results in the drive system becoming unstable.
Therefore, the overall performance of the DTC system is degrading. To overcome
this stator resistance compensation is essential.
Conclusion: 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 method
ensures reliability and performs well during low and high operations. The
design of a PI-controlled stator resistance estimator is easier compared to
other controllers and it is implemented in DTC-CSI-fed IPMSM drives very first
time. The proposed control system was to deliver high performance at low-speed
operations.
Author(s)
Details
N. Panneer Selvam
Department of Electrical and Electronics Engineering, M.A.M. Polytechnic
College, Tiruchirappalli-621105, Tamil Nadu, India.
V. Rajasekaran
Department of Electrical and Electronics Engineering, PSNA College of
Engineering and Technology, Dindigul-624622, Tamil Nadu, India.
N. Jayanthi
Department of Electrical and Electronics Engineering, PSNA College of
Engineering and Technology, Dindigul-624622, Tamil Nadu, India.
Please see the book here:- https://doi.org/10.9734/bpi/caert/v7/1006
