基于SSOGI-RLSMC联合算法的加速器电源纹波抑制

Accelerator Power Ripple Suppression Based on SSOGI-RLSMC Combined Algorithm

重离子加速器电源系统对励磁电源输出电流的稳定度和纹波精度要求高。磁铁负载的存在产生的纹波,会对加速器通过磁场精确控制粒子运动轨迹带来影响。针对以上问题,提出一种基于SSOGI-RLSMC新型联合算法,以减小磁铁负载影响下励磁电源输出的电流纹波,提高电流稳定度。新型联合算法通过并联型二阶广义积分器(SSOGI)作为纹波检测器对纹波分量进行快速准确的提取,获得精度较高的指令电流;将指令电流和直流有源电力滤波器的补偿电流相减得到误差信号,利用趋近律滑模控制(RLSMC)算法对误差信号进行动态跟踪和补偿,以提高直流有源滤波器对励磁电源输出电流的纹波抑制能力,进而达到对粒子运动轨迹精确控制的目的。最后通过Matlab/Simulink仿真证明,所提的新型联合算法在以直流有源电力滤波器为主补偿手段的励磁电源中有效提高了励磁电源输出电流的精度和稳定度,改善了直流有源滤波器对纹波电流的抑制能力。

The power supply system of heavy ion accelerator requires high stability and ripple precision of excitation power supply.Because of the existence of magnet load,the ripple has an impact on the precise control of particle trajectory by magnetic field.To solve the above problems,a new combined algorithm based on SSOGIRLSMC is proposed to reduce the output current ripple of excitation power supply under the influence of magnet load and improve the current stability.The new joint algorithm extracts the ripple component quickly and accurately by using the parallel Second-Order Generalized Integrator(SSOGI)as the ripple detector,and obtains the command current with high precision.The error signal is obtained by subtracting the command current and the compensation current of the DC active power filter,and the Reaching Law Sliding Mode Control(RLSMC)algorithm is used to track and compensate the error signal dynamically,so as to improve the direct current active power filter can suppress the ripple of the output current of the excitation power supply,so as to achieve the precise control of the particle trajectory.Finally,through MATLAB/Simulink simulation,it is proved that the new joint algorithm can effectively improve the accuracy and stability of the output current of the excitation power supply,and improve the ripple current suppression ability of the DC active power filter.