Reactive power compensation controller is the core component of reactive power compensation device, which plays an important role. Most manufacturers of reactive power compensation device buy the controller and then assemble the whole machine by themselves. Few manufacturers have the ability to design and manufacture the controller, and few can design and manufacture the controller with excellent performance.

The existing low-end controller is based on the power factor control, although this kind of controller is cheap, but the performance is very poor, it has been eliminated, so it is not introduced here.

The existing high-end controller is based on reactive power control, but in addition, the design is often focused on Chinese character display and data communication. In fact, it is quite complicated to realize perfect reactive power compensation control. The main function of reactive power compensation controller is to realize perfect reactive power compensation control. Only when the main function is perfect, can additional function be considered.