With the development of accelerator technology, the synchrotronradiation source has gradually reached the diffraction limit. The qualityof a light source is directly affected by the stability and accuracy ofthe magnet power supply (MPS) [1]. When a light source is operatingproperly, the position of the electron beam in the transfer line and inthe storage ring may deviate from the normal orbit at any time [2].Therefore, a fast-response MPS is needed to correct the beam positionin real time.