AccuSine PFV electronic VAR compensation unit are designed to provide required reactive power within 1 cycle.  It also can inject negative sequence current to balance the unbalanced loads*. 

There are a lot of circumstances where the loads fluctuate quickly, and their reactive power requirement also fluctuates quickly.  It becomes advantageous to provide reactive power compensation by using AccuSine PFV unit.   Equipment such as welders, induction furnaces, crushers, shredders, steel mills, ball mills…etc., operate with rapid and frequent load variations. This results in rapid changes of real and reactive power requirements. Reactive power demand surge can cause the network voltage to drop significantly and often to the levels that cause sensitive loads to fault or lighting to flicker. For example, in the welder case, the voltage dips will cause poor quality welds. As such the quality of the end product (automobiles, pipes, etc) is severely affected.

Since power electronic devices can measure and inject the exact amount of current to meet a PF set point on a per cycle basis, continuously changing load levels are corrected very easily, thus system voltage profile are maintained.

Also, many of these loads employ independent phase to phase control. The result could cause unbalanced current on the electrical network that also causes unbalanced voltages.  AccuSine PFV can inject negative sequence current to compensate each phase so that all phases current are near equal.

* To the extent of the unit available capacity.  The load should be balanced from design to operation stages.