Title: Estimation of control loop bandwidth for desired tracking accuracy in a fast-ramped power converter for electromagnets in particle accelerators

Authors: Abhishek Srivastava; Mangesh Borage; Alok Singh; Vineet Dwivedi

Addresses: Raja Ramanna Centre for Advanced Technology, Indore, 452013, India ' Raja Ramanna Centre for Advanced Technology, Indore, 452013, India; Homi Bhabha National Institute, Mumbai, 400085, India ' Raja Ramanna Centre for Advanced Technology, Indore, 452013, India ' Raja Ramanna Centre for Advanced Technology, Indore, 452013, India

Abstract: The fast-ramp (FR) power converters (PCs) are used to ramp the magnetic field of electromagnets in particle accelerators at a fast rate, while maintaining the desired tracking accuracy with respect to the reference ramp profile. The development of such FRPCs with stringent tracking requirements, coupled with other factors, poses challenges to the design of feedback control system. In order to judge the adequacy of the single current control loop to achieve specified tracking accuracy, the relationship between the control loop bandwidth and tracking accuracy must be known. This relationship is established in the present paper for linear and sinusoidal ramp profiles by deriving closed-form mathematical expressions. Experimental studies are performed on a prototype power converter with maximum ratings of 100 A/35 V and it was observed that the experimental results are in good agreement with analytical findings.

Keywords: particle accelerator; fast-ramped; tracking accuracy; switch mode; power converter.

DOI: 10.1504/IJPELEC.2024.136564

International Journal of Power Electronics, 2024 Vol.19 No.2, pp.115 - 131

Received: 27 Sep 2022
Accepted: 20 Feb 2023
Published online: 07 Feb 2024 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article