基于悬浮拓扑的加速器脉冲电源设计

Design of Pulse Power Supply for Accelerator Based on Floating Topology

随着加速器技术的发展,重离子加速器脉冲电源工作频率逐步提高,电流上升速率逐步提升。脉冲电源磁铁负载具有阻感特性,其在电流波形上升段将吸收大量的无功,会对电网产生周期性强冲击;同时,快电流上升速率下的高精度要求,对电源设计提出了新的挑战。论文设计了一种基于电容储能的悬浮型H桥级联拓扑,利用电源自身储能电容和负载电感进行无功交互,实现了无功能量的内部循环,以减小对其对电网冲击;同时采用H桥级联多电平结合移相倍频控制,以保证电源快动态响应下的高精度需求。样机实验结果验证了电源拓扑和控制原理的可行性,为加速器快电流上升速率脉冲电源提供了一种新的解决方案。

With the development of accelerator technology,the working frequency and current rising rate of the pulse power supply of heavy ion accelerator are gradually increased.The magnet load of pulse power supply has the resistive characteristic,and it will absorb a large amount of reactive power in the rising section of current waveform,which will have a strong periodic impact on the power grid.At the same time,the high precision requirement of fast current rising rate poses new challenges to power supply design.In this paper,a suspension type H-bridge cascade topology based on capacitor energy storage is designed,which uses the energy storage capacitance and load inductance of the power supply to carry out reactive power interaction,and realizes the internal circulation of the reactive power,so as to reduce the impact on the power grid.At the same time,multilevel modulation and multiple frequency phase shift method is adopted to ensure the high precision demand under the fast dynamic response of power supply.The experimental results of the prototype verify the feasibility of the power supply topology and control principle,providing a new solution for the pulse power supply of accelerator based on fast current rising rate.