Authors : Deepak M. Sajnekar, Sadanand B. Deshpande and R.M. Moharil
Abstract: Maintaining terminal voltage of brushless synchronous generator at rated value is accomplished through Automatic Voltage Regulator (AVR). Modern digital AVR are consisting PID controller in forward path ensures fast response in the event of disturbance. Popularity of the digital AVR is based on easy installation, implementation and many advantages that include keeping records of the events in memory that is easily accessible for the analysis whenever needed. Digital keypad is used for setting PID gains to improve performance of the system. Digital PID controller reads the error signal at regular interval unlike analog controller that reads the error signal continuously. Regular interval at which digital processor reads error signal is called sampling time that has substantial effect on the performance of the controller and consequently affects the stability of the power system where synchronous generator using digital excitation system is connected in parallel. This study addresses the issues of variation of sampling time on the performance of digital excitation control system. Analysis is carried out using standard simulation model of excitation control system that is duly validated using industrial controller board by using hardware in the loop experimentation.
Deepak M. Sajnekar, Sadanand B. Deshpande and R.M. Moharil, 2018. Effect on Performance of Discrete PID Controller for Digital Excitation Control System due to Variation of Sampling Time. Journal of Engineering and Applied Sciences, 13: 9385-9393.