Static compensation is only fixed (in order) capacitors according to power factor switching, while dynamic compensation is based on the power factor difference and the selected switching capacitance is wrong.

Reactive power compensator is a kind of compensation device. The role of the power supply system is to improve the power factor of the power grid, reduce the loss of the power transformer and transmission line, improve the efficiency of power supply and improve the power supply environment. So the reactive power compensation device is in an indispensable and important position in the power supply system. Reasonable selection of compensation device can minimize the loss of the network and improve the quality of the power grid. On the contrary, if the selection or use is not correct, it may cause many factors such as power supply system, voltage fluctuation, harmonic increase and so on.

There are three sampling modes of the controller, namely, power factor type, reactive power type and reactive current type. Choosing that kind of physical control mode is actually the choice of reactive power compensation controller. Controller is the command system of reactive power compensation device. The functions of sampling, calculation, sending switching signal, parameter setting, measurement, component protection and so on are all completed by the compensation controller. Over the past decade, it has experienced a rapid development process from discrete components - integrated circuit - single chip microcomputer DSP chip, and its function is also more and more perfect. In terms of the overall situation in China, due to the large demand of the market, more and more manufacturers, their performance and internal quality are different, many products are not in line with the name, so we should take seriously when selecting. Another problem to be noticed in the selection is that the names of controllers produced in China are "XXX reactive power compensation controllers", and the meaning of "reactive power" in the name is not the sampling physical quantity of this controller. The physical amount of sampling depends on the product model, not the name of the product.