Design of a Self-Optimizing Magnet Power Supply Controller for the Hefei advanced light facility

Abstract: The Hefei Advanced Light Facility (HALF) is a fourth-generation synchrotron radiation source based on a diffraction-limited storage ring. Its electron beam energy is 2.2 GeV, with an emittance target of less than 100 pm·rad. Due to the need for over a thousand magnet steady-state power supplies at HALF, the empirical tuning method using conventional PID controller parameters requires a significant amount of time.This study aims to design a PID controller parameter auto-tuning algorithm for the magnet steady-state power supply of HALF, to achieve optimal PI parameters. This ensures stability within 50 ppm for the magnet steady-state power supply and reduces overshoot in step response when changing the current operating point, facilitating smooth transitions.Based on polynomial regression and genetic algorithms, an auto-tuning algorithm for PI controller parameters was developed for the magnet steady-state power supply controller. This algorithm was integrated with the supervisory computer system to record various data points. Development and testing of this algorithm have been completed on the magnet steady-state power supply.The results show its key technical specifications meet the operational requirements, significantly improving debugging efficiency.