应用于强流重离子加速器装置增强环(HIAF-BRing)的快循环全储能脉冲电源需要在极宽的输出电压范围内保持极高的控制精度,为此电源采用了高压功率单元和低压功率单元串联的拓扑方式,在低压段采用低压功率单元,电压升高之后切换到高压功率单元,通过高低压切换控制来实现电流全阶段的高精度输出.但是在样机实测中发现存在切换点的振荡问题,导致切换点处的输出电流绝对误差无法满足指标要求.本文提出了一种切换点平滑控制算法来平滑处理切换点占空比,给出了仿真结果,并且在HIAF-BRing快循环全储能脉冲电源样机上面实际验证了高低压切换控制方法及其切换点平滑控制算法的有效性.实验结果表明:100?A注入平台的输出电流绝对误差由±500?mA降至±50?mA,100?A注入平台的切换点处输出电流绝对误差由±1.16?A降至±120?mA,100?A注入平台输出精度较低的问题得以解决.

Using FLUENT CFD analysis software, the thermal flow coupling temperature field simulation analysis of three different wind path structure is carried out. The results show that circulating air circuit formed by openings on the stator and rotor yoke is the best, which can reduce motor maximum temperature by 50 ℃ and the temperature difference between the stator and rotor. It provides a reference for ventilation system design of water-cooled base tunneling motor.

Power supply prototype in High Intensity heavy ion Accelerator Facility-Booster Ring (HIAF-BRing) adopts the scheme of full energy and fast cycle storage pulse power supply topology. Its multi modules are connected in series and parallel pattern, and the power reaches megawatt level. Due to the high power and large scale of the power supply, a module fault interlock protection system based on Programmable Logic Controller (PLC), interlock boards and Field Programmable Gate Array (FPGA) is designed and implemented to protect the power supply in operation. In this paper, first, a design of double redundant module fault interlock is introduced. Second, the logic implemented in PLC is described. Third, the work about FPGA is given. Finally, the system is tested in three aspects: the responsive time of the power supply interlock loop, the total time from controller error occurrence to interlock finish, and the equipment fault response. The result shows that the module fault interlock system can action sensitively, timely and reliably in case of fault occurrence, which meets the requirements of the power supply prototype in HIAF-BRing.