The design of adaptive control algorithm for chopper power supply

Purpose The paper focuses on the renovation of the quadrupole and sextupole magnet power supply (referred to as the Chopper power supply) in the BEPCII series maintenance and renovation project (BIIU) and develops a fully digital control system based on SoC FPGA to achieve digital closed-loop contro...
Ausführliche Beschreibung

Purpose The paper focuses on the renovation of the quadrupole and sextupole magnet power supply (referred to as the Chopper power supply) in the BEPCII series maintenance and renovation project (BIIU) and develops a fully digital control system based on SoC FPGA to achieve digital closed-loop control of the power supply. At the same time, adaptive algorithms are loaded into the control system to automatically optimize the closed-loop parameters [1], thereby avoiding the tedious manual parameter debugging process. Methods A digital control platform has been employed to integrate the digital control of the Chopper power supply, using SoC FPGA as the signal processing core. This platform comprises a core board, a control system backplane, an AD board, a digital signal processing DIO board, and a power board. A closed-loop control system with the PI regulator as the main component has been embedded into SoC FPGA to achieve high-precision closed-loop control of output current [2]. To obtain the mathematical model of the controlled object, a system identification algorithm has been employed, and the regulator parameters have been optimized using a genetic algorithm. Results The controller and control algorithm have been implemented on a desktop power supply prototype, and their control effectiveness has been validated. Conclusions Experimental results have demonstrated the feasibility of the digital transformation plan for the quadrupole and sextupole magnet power supply. The Chopper power supply can now automatically adjust PI control parameters for different loads, and stability tests of the power supply output current and output voltage ripple have been conducted, meeting or exceeding the physical requirements. Ausführliche Beschreibung