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Vol. 87, Issue 1, January 2008, pp.74-84




Design and Testing of a Low Cost PID Controller Combined with Inverse Derivative Control Action and Its Application in Voltage  Control Systems of DC Generator


*Subrata CHATTOPADHYAY and #Satish Chandra BERA

*National Institute of Technical Teachers Training & Research, Kolkata,

Block FC, Sector –III, Salt Lake City, Kolkata-700106, India

# Instrumentation Engineering Section, Applied Physics, University of Calcutta

92, APC Road, Kolkata – 700 009, India

E-mail: subrata0507@sify.com



Received: 29 November 2007   /Accepted: 21 January 2008   /Published: 28 January 2008


Abstract: A single PID controller in a process control loop may suffer from high frequency oscillations without offset or low frequency oscillation with offset. An inverse derivative control action can eliminate both of these errors. In the present paper, a low cost operational amplifier based PID controller with inverse derivative control action has been described. Its transfer function has been derived and is found to be identical with the form already derived by other workers. It has been tested with a process plant analogue and implemented in the voltage control system of a DC generator. Its transfer function along with its characteristics in a process plant analogue and the load characteristics of DC generator with and without this controller have been determined experimentally and reported in this paper.


Keywords: PID control, Inverse derivative control, Control parameters, Voltage Control System, DC generator


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