JKW-200 intelligent reactive power compensation unit controller is a special controller for controlling intelligent reactive power compensation unit. Through collecting voltage and current information of power grid, FFT (fast Fourier calculation method) is used to analyze and calculate the collected electric energy information; fully digital control integrates the functions of reactive power compensation control, microcomputer protection and distribution comprehensive monitoring, and through RS485 online interface It can control the network operation of multiple intelligent reactive power compensation units with any capacity in any compensation mode (co compensation and partial compensation). The Chinese man-machine interface is used to display directly and set up conveniently. And can be equipped with communication port, realize timing, real-time call, remote control and parameter modification.