[Background] Shanghai Synchrotron Radiation Facility (SSRF) is an advanced third-generation synchrotron radiation electron accelerator, it requires the magnetic field of long-term stability and high-accuracy. Hence the accelerator power supply is requested to keep the exciting current stable. [Purpose] This study aims to propose a dynamic current compensating method based on the load side of magnet to solve the problem of abrupt current caused by power grid voltage drop. [Methods] Band-pass filter was applied to the extraction of the abrupt current waveform, and the opposite polarity with the abrupt current was generated by real-time computation of the proportional integral (PI) controller. The compensator compensates the abrupt current by paralleling this opposite polarity current to inhibit the abrupt current at load side. [Results] Simulation and experiment results showed that the above-mentioned method has obvious effect for inhibition of abrupt current on load side. [Conclusion] The compensator is proved to be practical in restraining abrupt current.%为解决加速器电源因电网电压陷落导致电源输出电流突变问题,提出一种基于磁铁负载侧的动态电流补偿方法,该方法以并联方式在负载端进行电流补偿.本文对其原理进行了可行性分析,用带通滤波器提取突变波形并实时计算通过比例积分(Proportional Integral, PI)控制产生反向突变电流以达到抑制的效果,并通过了原理性仿真以及样机验证.从实验结果验证了方案的合理性,补偿电流的响应速度能够跟上突变电流,对于突变电流确实有明显的抑制效果.
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