Nonlinear Digital PID Controller for Position Controlled Electric Drive Systems
Srikanth Mandarapu1, Sreedhar Lolla2, M.V.Suresh Kumar3

1Srikanth Mandarapu, Electrical & Electronics Engineering, JNTU-K, Pydah college of Engineering & Technology, Visakhapatnam, India.
2Sreedhar Lolla, Electrical & Electronics Engineering, JNTU-K ,Pydah college of Engineering & Technology, Visakhapatnam, India.
3M.V.Suresh Kumar, Electrical & Electronics Engineering, JNTU-K ,Raghu Engineering college, Visakhapatnam, India. Department, Pranveer Singh Institute of Technology, Kanpur, India.

Manuscript received on June 11, 2013. | Revised Manuscript received on June 15, 2013. | Manuscript published on June 25, 2013. | PP: 5-8 | Volume-1 Issue-8, June 2013. | Retrieval Number: H0335061813/2013©BEIESP

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Abstract: This paper discusses the implementation of Nonlinear digital PID controller for position controlled electric drive systems. The drawback with PD controller is that it produces a non aperiodic response, when it encounters a maximum torque limit. To overcome this drawback, the nonlinear PD controller is redesigned so to produce aperiodic response. The applicability of PD controller is limited only for the cases of reference input changes, while along with reference input, if disturbance inputs are also considered, the output results in a steady state error (S.S.E), which is proportional to the disturbance value. To minimize the S.S.E while producing a strong aperiodic response, it is proposed to implement a nonlinear digital PID controller. The proposed scheme in this paper is compared with the linear mode, is implemented in MATLAB and from the obtained results its possible use, limitations and counter measures have been studied.
Keywords: Anti wind-up, non linear PID controller, PD controller, quantizer, S.S.E, torque limiter.