What Is a Static VAR Compensator?

The static reactive power compensator (SVC) emerged in the 1970s and has developed into a very mature FACTS device, which is widely used in modern power system load compensation and transmission line compensation (voltage and reactive power compensation). In the power grid, SVC is used for voltage control or to obtain other benefits, such as improving the damping and stability of the system.

Static synchronization

The static reactive power compensator is a power quality management device that uses the conduction angle of a control thyristor to control or switch passive power components. According to its different control and switching components, it can be divided into thyristor control reactor (TCR), thyristor switching reactor (TSR), Thyristor switching capacitor (TSC), thyristor switching capacitor (TSF, Thyristor Switched Filter). In principle, there is no difference between the low-voltage type static reactive power compensation and the high-voltage type, but in the implementation mode, centralized compensation is changed to decentralized compensation, and high-voltage compensation is changed to low-voltage compensation.

According to the adjustment method of the reactor, the static reactive power compensator has the following 3 types ^[2]

The static reactive power compensator can be adjusted continuously and smoothly in both directions; compared with the synchronous camera adjustment, the static reactive power compensator has no rotating parts, so the operation and maintenance are simple. At the same time, the static reactive power compensator has a fast adjustment speed, so it has great advantages. Its disadvantage is that it generates harmonics. If no measures are taken to pollute the power system, there are usually matching power filters. In order to achieve two-way continuous regulation and overcome the weakness of the regulation effect of parallel capacitors, it is required to increase the compensation capacity ^[3] .