Intelligent capacitors integrate advanced technologies such as modern measurement and control, power electronics, network communication, automation control, and power capacitors. It has changed the outdated controller technology of traditional reactive power compensation devices and the outdated mechanical contactors or electromechanical integrated switches as the switching technology of capacitors. It has also changed the bulky and cumbersome structural mode of traditional reactive power compensation devices, making the new generation of low-voltage reactive power compensation devices more effective in compensation, smaller in size, lower in power consumption, cheaper in price, more cost-effective, more flexible in use, and more convenient in maintenance, The characteristics of longer service life and higher reliability adapt to the higher requirements of modern power grids for reactive power compensation.