In this paper

the three-phase unbalance control device for three-phase four-wire distribution network can be divided into three categories:Switching capacitor type

commutation switch type and VSC type.The reader can have a deep understanding of the present unbalance control device through the detailed introduction of their operating principle

wiring mode and scope of application and can select correct type of compensation device as per the actual condition at site.Finally

the importance on correctly selecting the unbalance control device is illustrated further with the low voltage typical control case due to three-phase unbalance of low voltage distribution network from remote mountain village of Sichuan Province.