Aimed at the high stability requirement of hospital power system

in this paper a kind of reacive compensation device based on improved SVG is proposed and it is mainly composed of data acquisitio device

control box

converter and three-phase voltage output. During the compensation period

the current and voltage signal acquisited by the power network passes through the data acquisition unit in which the self adaptive median filter is set correspondingly for the filtering regulation of the current and voltage signal

remove impulse interference

obtain the control triger signal with SVG phase compensation

and thus achives the voltage compensation and reactive power regulation of the converter. Four different types of power distortion signals needing reactive power compensation are tested by experinment. It is shown by its result that for power distortion signal with different degree

the device mentioned in the paper can perform effective reactive power compensation and integral distortion of the voltage signal is controlled around 0.5% so to assure the load performance.