Design of PID controller for automatic voltage regulator and validation using hardware in the loop technique

Author(s):Deepak M.Sajnekarb, Kolhea, S. B. Deshpandec,R. M. Moharilb,Narayan P. Patidard,Koki Ogurae
aFaculty of Engineering &Science,University of Agder.,PO Box 422, Kristiansand, NO 4604, Norway.
bElectrical Engineering Department,Yeshwantrao Chavan College of Engineering, Nagpur, Maharashtra,441110, India
cElectrical Engineering Department, Priyadarshini College of Engineering Nagpur, Maharashtra, 441110, India.
dElectrical Engineering Department, M.A. National Institute of Technology, Bhopal, M.P., 462007, India
eDepartment of Electrical Engineering, Faculty of Science and Engineering, Kyushu Sangyo University, Fukuoka, Japan
International Journal of Smart Grid and Clean Energy, vol. 7, no. 2, April 2018: pp. 75-89
ISSN: 2315-4462 (Print)
ISSN: 2373-3594 (Online)
Digital Object Identifier: 10.12720/sgce.7.2.75-89

Abstract: Digital Excitation Control System (DECS) for brushless synchronous generator is recently popularising due to ease of operation and flexibility to manage the operating parameter for achieving better maintenance of output terminal voltage at rated value. The latest industrial digital Automatic Voltage Regulator (AVR) is used in the forward path of digital excitation control system. This Paper addresses the issues of digital excitation control system that are responsible for deviating terminal voltage from rated value and as a result makes power system unstable. Solution to the issue is provided with a new method of tuning PID controller that eases the impact of discretisation on terminal voltage and keeps the digital excitation control system compatible with industrial standards. The controller designed in this way will be useful for maintaining terminal voltage of synchronous generator to enhance the stability in power system to which many renewable energy sources are interconnected. The proposed method improves the performance of excitation control system by reducing overshoot from 75% to 16%. Simulation results are presented by using industrial standard model of excitation control system to demonstrate and compare the performance of existing with the new digital excitation system. The newly designed controller is tested and validated using ‘Hardware In the Loop Technique’ (HITL).

Keywords: Automatic voltage regulator, PID controller, excitation control system, brushless synchronous generator
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