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

The existing low-end controllers are controlled based on power factor. Although this controller is cheap, its performance is very poor, and it has been eliminated. Therefore, it will not be introduced here.

The existing high-end controllers are controlled based on reactive power, but in addition, they often focus on Chinese character display and data communication. In fact, to really realize the perfect reactive power compensation control is a very complex thing. Realizing the perfect reactive power compensation control is the main function of the reactive power compensation controller. Only when the main function is quite perfect, can the additional function be considered.