Authors: Kalal Muralidhar Goud; Shyam Krishna Nagar
Addresses: Department of Electrical Engineering, Indian Institute of Technology (BHU), Varanasi, 221005, UP, India ' Department of Electrical Engineering, Indian Institute of Technology (BHU), Varanasi, 221005, UP, India
Abstract: This paper presents a novel technique for the analytical design of the fractional order controller for non-monotonic phase systems. The PD controller is designed for non-monotonic system based on gain crossover frequency and phase margin specifications. The method provides a minimum phase margin in the desired bandwidth. The proposed method redefines the concept of phase margin for non-monotonic system with decreasing phase. Introduction of the fractional power parameters offers some advantage in terms of robust performance. For comparison, the proposed non-monotonic method and the conventional method are chosen for the same set of tuning constraints.
Keywords: fractional order control; PD control; non-monotonic phase systems; robust control; phase margin; gain crossover frequency; controller design.
International Journal of Automation and Control, 2015 Vol.9 No.2, pp.130 - 142
Available online: 22 Jun 2015 *Full-text access for editors Access for subscribers Purchase this article Comment on this article