The technology adopted for the present control of three-phase unbalance in distribution network is to bridge inductance

capacitance among phases or load three-phase reverse device

but the size is too big

the compensation accuracy is insufficient and the response load variation is lag due to the characteristic technology itself. With the development of electric power and electronic technology

the electric and electronic-based compensation device can achieve the result of quickly and accurately compensating three-phase unbalance. However

comprehensive replacing the original LC compensation will cause definite resource waste due to its expensive construction cost. In this paper

a kind of hybrid compensator is proposed

which can use fast and accurate dynamic compensation of small power SVG

but also can use original LC to deal with the coarse compensation requirement of three-phase unbalance

and the control strategy of the overall coordination and subsystems is studied to deal with the flick and sag of grid voltage and

at the same time

it can prevent the over compensation danger by the traditional LC coarse compensation. The applicability of the solution in the three-phase unbalance compensation is verified by the simulation.